/* roulang page: index */
:root {
            --kaiyun-charcoal: #1A1A1A;
            --kaiyun-charcoal-2: #222222;
            --kaiyun-charcoal-3: #2D2D2D;
            --kaiyun-green: #00E676;
            --kaiyun-green-dark: #00C866;
            --kaiyun-warm-white: #F7F7F5;
            --kaiyun-coral: #FF6D3F;
            --kaiyun-text: #1A1A1A;
            --kaiyun-text-light: #F7F7F5;
            --kaiyun-text-muted: #6B6B66;
            --kaiyun-text-muted-light: #B8B8B2;
            --kaiyun-border: #E8E8E4;
            --kaiyun-border-dark: #3A3A3A;
            --kaiyun-radius: 12px;
            --kaiyun-radius-sm: 8px;
            --kaiyun-radius-lg: 16px;
            --kaiyun-shadow-light: rgba(0, 0, 0, 0.08) 0 6px 24px;
            --kaiyun-shadow-dark: rgba(0, 0, 0, 0.35) 0 8px 28px;
            --kaiyun-font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', 'Source Han Sans CN', sans-serif;
            --kaiyun-font-num: 'DIN Alternate', 'Bebas Neue', 'Oswald', 'Arial Narrow', sans-serif;
            --kaiyun-section-pad: 72px;
            --kaiyun-section-pad-mobile: 40px;
            --kaiyun-card-gap: 24px;
            --kaiyun-transition: all 0.25s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--kaiyun-font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--kaiyun-text);
            background-color: var(--kaiyun-warm-white);
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--kaiyun-transition);
        }
        img {
            max-width: 100%;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--kaiyun-green);
            outline-offset: 2px;
        }
        .kaiyun-container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .kaiyun-num {
            font-family: var(--kaiyun-font-num);
            letter-spacing: 0.02em;
        }
        /* Header / Nav */
        .kaiyun-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: var(--kaiyun-charcoal);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .kaiyun-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }
        .kaiyun-logo {
            font-size: 1.45rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            letter-spacing: 0.06em;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .kaiyun-logo-mark {
            display: inline-block;
            width: 22px;
            height: 22px;
            border: 2px solid var(--kaiyun-green);
            border-radius: 4px;
            position: relative;
            flex-shrink: 0;
        }
        .kaiyun-logo-mark::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) rotate(45deg);
            width: 10px;
            height: 10px;
            background-color: var(--kaiyun-green);
        }
        .kaiyun-nav-menu {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }
        .kaiyun-nav-link {
            font-size: 0.95rem;
            color: var(--kaiyun-text-muted-light);
            letter-spacing: 0.03em;
            position: relative;
            padding: 6px 0;
            white-space: nowrap;
            transition: var(--kaiyun-transition);
        }
        .kaiyun-nav-link:hover {
            color: var(--kaiyun-green);
        }
        .kaiyun-nav-link.kaiyun-nav-active {
            color: var(--kaiyun-green);
        }
        .kaiyun-nav-link.kaiyun-nav-active::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 100%;
            height: 2px;
            background-color: var(--kaiyun-green);
            border-radius: 1px;
        }
        .kaiyun-nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 22px;
            border-radius: var(--kaiyun-radius-sm);
            white-space: nowrap;
            transition: var(--kaiyun-transition);
            border: 2px solid transparent;
        }
        .kaiyun-nav-cta:hover {
            background-color: var(--kaiyun-green-dark);
            box-shadow: 0 0 20px rgba(0, 230, 118, 0.35);
            transform: translateY(-1px);
        }
        .kaiyun-nav-cta:active {
            transform: translateY(0);
        }
        .kaiyun-mobile-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
        }
        .kaiyun-mobile-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background-color: var(--kaiyun-text-light);
            border-radius: 1px;
            transition: var(--kaiyun-transition);
        }
        .kaiyun-mobile-toggle:hover span {
            background-color: var(--kaiyun-green);
        }
        .kaiyun-mobile-menu {
            display: none;
            background-color: var(--kaiyun-charcoal-2);
            padding: 16px 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .kaiyun-mobile-menu a {
            display: block;
            padding: 12px 0;
            color: var(--kaiyun-text-muted-light);
            font-size: 0.95rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .kaiyun-mobile-menu a:hover {
            color: var(--kaiyun-green);
        }
        .kaiyun-mobile-menu .kaiyun-nav-cta {
            margin-top: 12px;
            display: inline-flex;
        }
        /* Hero */
        .kaiyun-hero {
            background-color: var(--kaiyun-charcoal);
            background-image: url('/assets/images/eab425c48b821217.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            position: relative;
            color: var(--kaiyun-text-light);
            padding: 80px 0 64px;
            min-height: 560px;
            display: flex;
            align-items: center;
        }
        .kaiyun-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(145deg, rgba(26, 26, 26, 0.92) 0%, rgba(26, 26, 26, 0.78) 50%, rgba(26, 26, 26, 0.55) 100%);
            z-index: 1;
        }
        .kaiyun-hero-content {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        .kaiyun-hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: rgba(0, 230, 118, 0.12);
            border: 1px solid rgba(0, 230, 118, 0.3);
            color: var(--kaiyun-green);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            letter-spacing: 0.05em;
            margin-bottom: 24px;
        }
        .kaiyun-hero-title {
            font-size: clamp(2.2rem, 5.5vw, 3.6rem);
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: 0.02em;
            margin-bottom: 20px;
            color: var(--kaiyun-text-light);
        }
        .kaiyun-hero-title .highlight {
            color: var(--kaiyun-green);
        }
        .kaiyun-hero-sub {
            font-size: 1.08rem;
            color: #C9C9C2;
            max-width: 680px;
            line-height: 1.8;
            margin-bottom: 36px;
        }
        .kaiyun-hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 40px;
        }
        .kaiyun-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--kaiyun-radius-sm);
            font-weight: 700;
            font-size: 0.95rem;
            transition: var(--kaiyun-transition);
            border: 2px solid transparent;
            cursor: pointer;
            white-space: nowrap;
        }
        .kaiyun-btn-primary {
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            border-color: var(--kaiyun-green);
        }
        .kaiyun-btn-primary:hover {
            background-color: var(--kaiyun-green-dark);
            border-color: var(--kaiyun-green-dark);
            box-shadow: 0 0 24px rgba(0, 230, 118, 0.4);
            transform: translateY(-2px);
        }
        .kaiyun-btn-primary:active {
            transform: translateY(0);
        }
        .kaiyun-btn-outline-light {
            border-color: rgba(255, 255, 255, 0.5);
            color: var(--kaiyun-text-light);
            background: transparent;
        }
        .kaiyun-btn-outline-light:hover {
            background-color: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.8);
            transform: translateY(-2px);
        }
        .kaiyun-btn-outline-dark {
            border-color: rgba(26, 26, 26, 0.4);
            color: var(--kaiyun-charcoal);
            background: transparent;
        }
        .kaiyun-btn-outline-dark:hover {
            background-color: rgba(26, 26, 26, 0.06);
            border-color: rgba(26, 26, 26, 0.7);
            transform: translateY(-2px);
        }
        .kaiyun-hero-metrics {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            padding: 24px 28px;
            background: rgba(34, 34, 34, 0.7);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--kaiyun-radius);
            backdrop-filter: blur(10px);
            max-width: 820px;
        }
        .kaiyun-hero-metric {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .kaiyun-hero-metric-num {
            font-family: var(--kaiyun-font-num);
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--kaiyun-green);
            letter-spacing: 0.04em;
        }
        .kaiyun-hero-metric-label {
            font-size: 0.82rem;
            color: var(--kaiyun-text-muted-light);
            letter-spacing: 0.04em;
        }
        /* Section general */
        .kaiyun-section {
            padding: var(--kaiyun-section-pad) 0;
        }
        .kaiyun-section-dark {
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
        }
        .kaiyun-section-light {
            background-color: var(--kaiyun-warm-white);
            color: var(--kaiyun-text);
        }
        .kaiyun-section-alt {
            background-color: #F0F0EB;
            color: var(--kaiyun-text);
        }
        .kaiyun-section-header {
            margin-bottom: 44px;
        }
        .kaiyun-section-tag {
            display: inline-block;
            font-size: 0.78rem;
            font-weight: 700;
            letter-spacing: 0.12em;
            color: var(--kaiyun-coral);
            text-transform: uppercase;
            margin-bottom: 10px;
        }
        .kaiyun-section-dark .kaiyun-section-tag {
            color: var(--kaiyun-green);
        }
        .kaiyun-section-title {
            font-size: clamp(1.6rem, 3.5vw, 2.2rem);
            font-weight: 800;
            letter-spacing: 0.02em;
            line-height: 1.3;
            margin-bottom: 14px;
        }
        .kaiyun-section-desc {
            font-size: 1rem;
            color: var(--kaiyun-text-muted);
            max-width: 720px;
            line-height: 1.8;
        }
        .kaiyun-section-dark .kaiyun-section-desc {
            color: var(--kaiyun-text-muted-light);
        }
        /* Card grids */
        .kaiyun-card-grid {
            display: grid;
            gap: var(--kaiyun-card-gap);
        }
        .kaiyun-card {
            border-radius: var(--kaiyun-radius);
            overflow: hidden;
            transition: var(--kaiyun-transition);
            border: 1px solid var(--kaiyun-border);
        }
        .kaiyun-card-light {
            background-color: #fff;
            border-color: #F0F0ED;
            box-shadow: var(--kaiyun-shadow-light);
        }
        .kaiyun-card-light:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 0, 0, 0.12) 0 10px 32px;
            transform: translateY(-2px);
        }
        .kaiyun-card-dark {
            background-color: var(--kaiyun-charcoal-2);
            border-color: var(--kaiyun-border-dark);
            box-shadow: var(--kaiyun-shadow-dark);
        }
        .kaiyun-card-dark:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 230, 118, 0.22) 0 10px 32px;
            transform: translateY(-2px);
        }
        .kaiyun-card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .kaiyun-card:hover .kaiyun-card-img {
            transform: scale(1.02);
        }
        .kaiyun-card-body {
            padding: 20px 22px;
        }
        .kaiyun-card-title {
            font-size: 1.1rem;
            font-weight: 700;
            letter-spacing: 0.02em;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .kaiyun-card-text {
            font-size: 0.92rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.7;
            margin-bottom: 12px;
        }
        .kaiyun-card-dark .kaiyun-card-text {
            color: var(--kaiyun-text-muted-light);
        }
        .kaiyun-card-tag {
            display: inline-block;
            font-size: 0.78rem;
            color: var(--kaiyun-green);
            font-weight: 600;
            letter-spacing: 0.04em;
        }
        .kaiyun-card-dark .kaiyun-card-tag {
            color: var(--kaiyun-green);
        }
        /* Category entry */
        .kaiyun-cat-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 16px;
        }
        .kaiyun-cat-card {
            border-radius: var(--kaiyun-radius);
            padding: 24px 20px;
            text-align: center;
            transition: var(--kaiyun-transition);
            border: 1px solid var(--kaiyun-border);
            background-color: #fff;
            box-shadow: var(--kaiyun-shadow-light);
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
        }
        .kaiyun-cat-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 0, 0, 0.12) 0 8px 28px;
            transform: translateY(-3px);
        }
        .kaiyun-cat-icon {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background-color: rgba(0, 230, 118, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--kaiyun-green);
        }
        .kaiyun-cat-name {
            font-weight: 700;
            font-size: 0.95rem;
            letter-spacing: 0.04em;
            color: var(--kaiyun-text);
        }
        .kaiyun-cat-hint {
            font-size: 0.75rem;
            color: var(--kaiyun-text-muted);
        }
        /* Featured cards */
        .kaiyun-featured-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: var(--kaiyun-card-gap);
        }
        .kaiyun-featured-main {
            border-radius: var(--kaiyun-radius);
            overflow: hidden;
            position: relative;
            background-color: var(--kaiyun-charcoal);
            min-height: 360px;
            display: flex;
            align-items: flex-end;
            border: 1px solid var(--kaiyun-border-dark);
            box-shadow: var(--kaiyun-shadow-dark);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-featured-main:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 230, 118, 0.2) 0 10px 32px;
        }
        .kaiyun-featured-main img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .kaiyun-featured-main:hover img {
            transform: scale(1.03);
        }
        .kaiyun-featured-overlay {
            position: relative;
            z-index: 2;
            padding: 28px 32px;
            background: linear-gradient(0deg, rgba(26, 26, 26, 0.9) 0%, rgba(26, 26, 26, 0.4) 100%);
            width: 100%;
            color: var(--kaiyun-text-light);
        }
        .kaiyun-featured-overlay h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .kaiyun-featured-overlay p {
            font-size: 0.9rem;
            color: #C9C9C2;
            margin-bottom: 10px;
            max-width: 400px;
        }
        .kaiyun-featured-side {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .kaiyun-featured-side-item {
            flex: 1;
            border-radius: var(--kaiyun-radius);
            overflow: hidden;
            position: relative;
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 18px 20px;
            background-color: #fff;
            border: 1px solid var(--kaiyun-border);
            box-shadow: var(--kaiyun-shadow-light);
            transition: var(--kaiyun-transition);
            min-height: 100px;
        }
        .kaiyun-featured-side-item:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 0, 0, 0.12) 0 8px 24px;
            transform: translateX(4px);
        }
        .kaiyun-featured-side-img {
            width: 72px;
            height: 72px;
            border-radius: 8px;
            object-fit: cover;
            flex-shrink: 0;
        }
        .kaiyun-featured-side-info h4 {
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .kaiyun-featured-side-info p {
            font-size: 0.8rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.5;
        }
        /* Stats / advantages */
        .kaiyun-stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .kaiyun-stat-card {
            border-radius: var(--kaiyun-radius);
            padding: 28px 24px;
            background-color: var(--kaiyun-charcoal-2);
            border: 1px solid var(--kaiyun-border-dark);
            box-shadow: var(--kaiyun-shadow-dark);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-stat-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 230, 118, 0.2) 0 8px 28px;
            transform: translateY(-2px);
        }
        .kaiyun-stat-num {
            font-family: var(--kaiyun-font-num);
            font-size: 2.4rem;
            font-weight: 700;
            color: var(--kaiyun-green);
            letter-spacing: 0.04em;
            margin-bottom: 8px;
        }
        .kaiyun-stat-label {
            font-size: 0.9rem;
            color: var(--kaiyun-text-muted-light);
            line-height: 1.5;
        }
        /* Timeline / steps */
        .kaiyun-timeline {
            display: flex;
            flex-direction: column;
            gap: 20px;
            position: relative;
            padding-left: 44px;
        }
        .kaiyun-timeline::before {
            content: '';
            position: absolute;
            left: 16px;
            top: 8px;
            bottom: 8px;
            width: 2px;
            background-color: rgba(0, 230, 118, 0.3);
            border-radius: 1px;
        }
        .kaiyun-timeline-item {
            position: relative;
            padding: 20px 24px;
            border-radius: var(--kaiyun-radius);
            background-color: #fff;
            border: 1px solid var(--kaiyun-border);
            box-shadow: var(--kaiyun-shadow-light);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-timeline-item:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 0, 0, 0.1) 0 6px 24px;
            transform: translateX(4px);
        }
        .kaiyun-timeline-item::before {
            content: attr(data-step);
            position: absolute;
            left: -36px;
            top: 20px;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-family: var(--kaiyun-font-num);
            font-weight: 700;
            font-size: 0.85rem;
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 2;
        }
        .kaiyun-timeline-item h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .kaiyun-timeline-item p {
            font-size: 0.9rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.7;
        }
        /* News list */
        .kaiyun-news-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .kaiyun-news-item {
            display: flex;
            gap: 20px;
            align-items: center;
            padding: 16px 20px;
            border-radius: var(--kaiyun-radius);
            background-color: #fff;
            border: 1px solid var(--kaiyun-border);
            box-shadow: var(--kaiyun-shadow-light);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-news-item:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 0, 0, 0.1) 0 6px 24px;
            transform: translateX(4px);
        }
        .kaiyun-news-img {
            width: 120px;
            height: 80px;
            border-radius: 8px;
            object-fit: cover;
            flex-shrink: 0;
        }
        .kaiyun-news-info {
            flex: 1;
        }
        .kaiyun-news-info h4 {
            font-size: 0.98rem;
            font-weight: 700;
            margin-bottom: 6px;
            line-height: 1.4;
        }
        .kaiyun-news-info p {
            font-size: 0.85rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.6;
        }
        .kaiyun-news-meta {
            display: flex;
            gap: 14px;
            font-size: 0.75rem;
            color: var(--kaiyun-text-muted);
            margin-top: 6px;
        }
        .kaiyun-news-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .kaiyun-news-tag {
            display: inline-block;
            background-color: rgba(0, 230, 118, 0.1);
            color: #00B368;
            padding: 2px 10px;
            border-radius: 12px;
            font-size: 0.72rem;
            font-weight: 600;
            letter-spacing: 0.04em;
        }
        /* Ranking */
        .kaiyun-ranking-row {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .kaiyun-rank-card {
            border-radius: var(--kaiyun-radius);
            padding: 24px 22px;
            background-color: var(--kaiyun-charcoal-2);
            border: 1px solid var(--kaiyun-border-dark);
            box-shadow: var(--kaiyun-shadow-dark);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-rank-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 230, 118, 0.18) 0 8px 28px;
            transform: translateY(-2px);
        }
        .kaiyun-rank-header {
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.1em;
            color: var(--kaiyun-green);
            margin-bottom: 16px;
            text-transform: uppercase;
        }
        .kaiyun-rank-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .kaiyun-rank-list li {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.88rem;
            color: var(--kaiyun-text-muted-light);
            padding-bottom: 10px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            gap: 12px;
        }
        .kaiyun-rank-list li:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }
        .kaiyun-rank-num {
            font-family: var(--kaiyun-font-num);
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--kaiyun-coral);
            min-width: 24px;
        }
        .kaiyun-rank-name {
            flex: 1;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .kaiyun-rank-val {
            font-family: var(--kaiyun-font-num);
            font-weight: 700;
            color: var(--kaiyun-green);
        }
        /* Case wall */
        .kaiyun-case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--kaiyun-card-gap);
        }
        .kaiyun-case-card {
            border-radius: var(--kaiyun-radius);
            overflow: hidden;
            background-color: #fff;
            border: 1px solid var(--kaiyun-border);
            box-shadow: var(--kaiyun-shadow-light);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-case-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 0, 0, 0.12) 0 10px 32px;
            transform: translateY(-3px);
        }
        .kaiyun-case-card img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .kaiyun-case-card:hover img {
            transform: scale(1.03);
        }
        .kaiyun-case-body {
            padding: 18px 20px;
        }
        .kaiyun-case-body h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .kaiyun-case-body p {
            font-size: 0.85rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.6;
        }
        /* Brand intro */
        .kaiyun-brand-intro {
            max-width: 820px;
            line-height: 2;
            font-size: 0.98rem;
            color: var(--kaiyun-text-muted);
        }
        .kaiyun-brand-intro p {
            margin-bottom: 18px;
        }
        .kaiyun-brand-intro strong {
            color: var(--kaiyun-text);
            font-weight: 700;
        }
        .kaiyun-brand-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 24px;
        }
        .kaiyun-brand-tag {
            padding: 6px 16px;
            background-color: rgba(0, 230, 118, 0.1);
            border: 1px solid rgba(0, 230, 118, 0.25);
            color: #00B368;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.04em;
        }
        /* Data insight */
        .kaiyun-data-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .kaiyun-data-card {
            border-radius: var(--kaiyun-radius);
            padding: 28px 26px;
            background-color: var(--kaiyun-charcoal-2);
            border: 1px solid var(--kaiyun-border-dark);
            box-shadow: var(--kaiyun-shadow-dark);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-data-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 230, 118, 0.18) 0 8px 28px;
        }
        .kaiyun-data-label {
            font-size: 0.8rem;
            color: var(--kaiyun-text-muted-light);
            letter-spacing: 0.08em;
            margin-bottom: 8px;
            text-transform: uppercase;
        }
        .kaiyun-data-value {
            font-family: var(--kaiyun-font-num);
            font-size: 2.6rem;
            font-weight: 700;
            color: var(--kaiyun-green);
            letter-spacing: 0.04em;
            margin-bottom: 10px;
        }
        .kaiyun-data-bar {
            height: 6px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 3px;
            overflow: hidden;
            margin-bottom: 10px;
        }
        .kaiyun-data-bar-fill {
            height: 100%;
            background-color: var(--kaiyun-green);
            border-radius: 3px;
            transition: width 0.5s ease;
        }
        .kaiyun-data-note {
            font-size: 0.82rem;
            color: var(--kaiyun-text-muted-light);
            line-height: 1.6;
        }
        /* Partners */
        .kaiyun-partner-row {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 16px;
        }
        .kaiyun-partner-logo {
            border-radius: var(--kaiyun-radius-sm);
            padding: 28px 16px;
            text-align: center;
            background-color: #fff;
            border: 1px solid var(--kaiyun-border);
            box-shadow: var(--kaiyun-shadow-light);
            transition: var(--kaiyun-transition);
            font-weight: 700;
            font-size: 0.9rem;
            color: var(--kaiyun-text-muted);
            letter-spacing: 0.06em;
            cursor: default;
        }
        .kaiyun-partner-logo:hover {
            border-color: var(--kaiyun-green);
            color: var(--kaiyun-text);
            box-shadow: rgba(0, 0, 0, 0.1) 0 6px 20px;
            transform: translateY(-2px);
        }
        /* Community */
        .kaiyun-community-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .kaiyun-topic-card {
            border-radius: var(--kaiyun-radius);
            padding: 22px 20px;
            background-color: #fff;
            border: 1px solid var(--kaiyun-border);
            box-shadow: var(--kaiyun-shadow-light);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-topic-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 0, 0, 0.1) 0 8px 24px;
            transform: translateY(-2px);
        }
        .kaiyun-topic-title {
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .kaiyun-topic-text {
            font-size: 0.85rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.6;
            margin-bottom: 14px;
        }
        .kaiyun-topic-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.78rem;
            color: var(--kaiyun-text-muted);
        }
        .kaiyun-topic-avatar {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background-color: #E0E0DA;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.7rem;
            color: #999;
        }
        .kaiyun-topic-stats {
            display: flex;
            gap: 12px;
            font-size: 0.78rem;
            color: var(--kaiyun-text-muted);
        }
        .kaiyun-topic-stats span {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        /* Guarantee bar */
        .kaiyun-guarantee-bar {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            padding: 28px 32px;
            border-radius: var(--kaiyun-radius);
            background: linear-gradient(135deg, var(--kaiyun-charcoal) 0%, #2D2D2D 100%);
            border: 1px solid var(--kaiyun-border-dark);
            box-shadow: var(--kaiyun-shadow-dark);
            color: var(--kaiyun-text-light);
        }
        .kaiyun-guarantee-bar h3 {
            font-size: 1.2rem;
            font-weight: 700;
            letter-spacing: 0.03em;
            margin-bottom: 8px;
        }
        .kaiyun-guarantee-bar p {
            font-size: 0.9rem;
            color: var(--kaiyun-text-muted-light);
            max-width: 600px;
            line-height: 1.7;
        }
        .kaiyun-guarantee-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 18px;
            background-color: rgba(0, 230, 118, 0.12);
            border: 1px solid rgba(0, 230, 118, 0.3);
            border-radius: 20px;
            color: var(--kaiyun-green);
            font-size: 0.82rem;
            font-weight: 600;
            letter-spacing: 0.04em;
        }
        /* CTA section */
        .kaiyun-cta-section {
            padding: var(--kaiyun-section-pad) 0;
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
        }
        .kaiyun-cta-panel {
            max-width: 720px;
            margin: 0 auto;
            text-align: center;
        }
        .kaiyun-cta-panel h2 {
            font-size: clamp(1.8rem, 4vw, 2.4rem);
            font-weight: 800;
            letter-spacing: 0.02em;
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .kaiyun-cta-panel p {
            font-size: 1rem;
            color: var(--kaiyun-text-muted-light);
            max-width: 560px;
            margin: 0 auto 28px;
            line-height: 1.8;
        }
        /* FAQ */
        .kaiyun-faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            max-width: 800px;
        }
        .kaiyun-faq-item {
            border-radius: var(--kaiyun-radius);
            background-color: #fff;
            border: 1px solid var(--kaiyun-border);
            box-shadow: var(--kaiyun-shadow-light);
            overflow: hidden;
            transition: var(--kaiyun-transition);
        }
        .kaiyun-faq-item:hover {
            border-color: rgba(0, 230, 118, 0.4);
        }
        .kaiyun-faq-question {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 18px 22px;
            cursor: pointer;
            font-weight: 700;
            font-size: 0.95rem;
            letter-spacing: 0.02em;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            color: var(--kaiyun-text);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-faq-question:hover {
            color: #00B368;
        }
        .kaiyun-faq-num {
            font-family: var(--kaiyun-font-num);
            font-size: 0.85rem;
            color: var(--kaiyun-green);
            font-weight: 700;
            min-width: 28px;
            text-align: center;
        }
        .kaiyun-faq-toggle {
            margin-left: auto;
            font-size: 1.2rem;
            color: var(--kaiyun-text-muted);
            transition: var(--kaiyun-transition);
            flex-shrink: 0;
        }
        .kaiyun-faq-item.kaiyun-faq-open .kaiyun-faq-toggle {
            transform: rotate(45deg);
            color: var(--kaiyun-green);
        }
        .kaiyun-faq-answer {
            padding: 0 22px 18px 64px;
            font-size: 0.9rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.8;
            display: none;
        }
        .kaiyun-faq-item.kaiyun-faq-open .kaiyun-faq-answer {
            display: block;
        }
        /* Footer */
        .kaiyun-footer {
            background-color: var(--kaiyun-charcoal);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 48px 0 32px;
            color: var(--kaiyun-text-muted-light);
        }
        .kaiyun-footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 36px;
        }
        .kaiyun-footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            letter-spacing: 0.04em;
            margin-bottom: 12px;
        }
        .kaiyun-footer-text {
            font-size: 0.85rem;
            color: var(--kaiyun-text-muted-light);
            line-height: 1.7;
            max-width: 300px;
        }
        .kaiyun-footer-col h4 {
            font-size: 0.82rem;
            font-weight: 700;
            letter-spacing: 0.1em;
            text-transform: uppercase;
            color: var(--kaiyun-green);
            margin-bottom: 16px;
        }
        .kaiyun-footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .kaiyun-footer-col a {
            font-size: 0.88rem;
            color: var(--kaiyun-text-muted-light);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-footer-col a:hover {
            color: var(--kaiyun-green);
        }
        .kaiyun-footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            font-size: 0.78rem;
            color: var(--kaiyun-text-muted-light);
        }
        .kaiyun-footer-bottom a {
            color: var(--kaiyun-text-muted-light);
        }
        .kaiyun-footer-bottom a:hover {
            color: var(--kaiyun-green);
        }
        .kaiyun-footer-bottom-links {
            display: flex;
            gap: 16px;
            align-items: center;
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .kaiyun-nav-menu {
                gap: 20px;
            }
            .kaiyun-cat-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .kaiyun-stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .kaiyun-featured-grid {
                grid-template-columns: 1fr;
            }
            .kaiyun-featured-main {
                min-height: 300px;
            }
            .kaiyun-ranking-row {
                grid-template-columns: 1fr;
            }
            .kaiyun-case-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .kaiyun-community-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .kaiyun-partner-row {
                grid-template-columns: repeat(3, 1fr);
            }
            .kaiyun-data-grid {
                grid-template-columns: 1fr;
            }
            .kaiyun-footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .kaiyun-section {
                padding: 56px 0;
            }
        }
        @media (max-width: 768px) {
            .kaiyun-nav-menu {
                display: none;
            }
            .kaiyun-nav-cta {
                display: none;
            }
            .kaiyun-mobile-toggle {
                display: flex;
            }
            .kaiyun-mobile-menu.kaiyun-mobile-open {
                display: block;
            }
            .kaiyun-nav {
                height: 60px;
            }
            .kaiyun-hero {
                padding: 48px 0 40px;
                min-height: 420px;
            }
            .kaiyun-hero-title {
                font-size: 1.9rem;
            }
            .kaiyun-hero-sub {
                font-size: 0.95rem;
            }
            .kaiyun-hero-metrics {
                gap: 20px;
                padding: 18px 20px;
                flex-wrap: wrap;
            }
            .kaiyun-hero-metric-num {
                font-size: 1.4rem;
            }
            .kaiyun-section {
                padding: 40px 0;
            }
            .kaiyun-section-title {
                font-size: 1.5rem;
            }
            .kaiyun-cat-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .kaiyun-cat-card {
                padding: 18px 14px;
            }
            .kaiyun-stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .kaiyun-stat-card {
                padding: 20px 18px;
            }
            .kaiyun-stat-num {
                font-size: 1.8rem;
            }
            .kaiyun-case-grid {
                grid-template-columns: 1fr;
            }
            .kaiyun-community-grid {
                grid-template-columns: 1fr;
            }
            .kaiyun-partner-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .kaiyun-timeline {
                padding-left: 36px;
            }
            .kaiyun-timeline-item::before {
                left: -30px;
                width: 24px;
                height: 24px;
                font-size: 0.75rem;
            }
            .kaiyun-news-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }
            .kaiyun-news-img {
                width: 100%;
                height: 160px;
            }
            .kaiyun-featured-side-item {
                flex-direction: column;
                align-items: flex-start;
            }
            .kaiyun-featured-side-img {
                width: 100%;
                height: 140px;
            }
            .kaiyun-footer-grid {
                grid-template-columns: 1fr;
            }
            .kaiyun-footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .kaiyun-guarantee-bar {
                flex-direction: column;
                text-align: center;
            }
            .kaiyun-faq-answer {
                padding-left: 22px;
            }
            .kaiyun-faq-question {
                padding: 14px 16px;
                gap: 10px;
            }
        }
        @media (max-width: 520px) {
            .kaiyun-container {
                padding: 0 16px;
            }
            .kaiyun-cat-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .kaiyun-cat-card {
                padding: 14px 10px;
            }
            .kaiyun-cat-icon {
                width: 36px;
                height: 36px;
                font-size: 1rem;
            }
            .kaiyun-cat-name {
                font-size: 0.82rem;
            }
            .kaiyun-hero-title {
                font-size: 1.6rem;
            }
            .kaiyun-hero-sub {
                font-size: 0.88rem;
            }
            .kaiyun-btn {
                padding: 10px 20px;
                font-size: 0.85rem;
            }
            .kaiyun-stats-row {
                grid-template-columns: 1fr;
            }
            .kaiyun-partner-row {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .kaiyun-section-header {
                margin-bottom: 28px;
            }
            .kaiyun-section-title {
                font-size: 1.3rem;
            }
            .kaiyun-hero-metrics {
                flex-direction: column;
                gap: 12px;
                padding: 14px 16px;
            }
            .kaiyun-hero-metric {
                flex-direction: row;
                align-items: baseline;
                gap: 12px;
            }
            .kaiyun-hero-metric-num {
                font-size: 1.3rem;
            }
            .kaiyun-timeline {
                padding-left: 30px;
            }
            .kaiyun-timeline::before {
                left: 12px;
            }
            .kaiyun-timeline-item::before {
                left: -26px;
                width: 20px;
                height: 20px;
                font-size: 0.7rem;
                top: 18px;
            }
            .kaiyun-footer-bottom-links {
                flex-direction: column;
                gap: 6px;
            }
        }

/* roulang page: category1 */
:root {
            --kaiyun-charcoal: #1A1A1A;
            --kaiyun-charcoal-2: #222222;
            --kaiyun-charcoal-3: #2D2D2D;
            --kaiyun-green: #00E676;
            --kaiyun-green-dark: #00C866;
            --kaiyun-warm-white: #F7F7F5;
            --kaiyun-coral: #FF6D3F;
            --kaiyun-text: #1A1A1A;
            --kaiyun-text-light: #F7F7F5;
            --kaiyun-text-muted: #6B6B66;
            --kaiyun-text-muted-light: #B8B8B2;
            --kaiyun-border: #E8E8E4;
            --kaiyun-border-dark: #3A3A3A;
            --kaiyun-radius: 12px;
            --kaiyun-radius-sm: 8px;
            --kaiyun-radius-lg: 16px;
            --kaiyun-shadow-light: rgba(0, 0, 0, 0.08) 0 6px 24px;
            --kaiyun-shadow-dark: rgba(0, 0, 0, 0.35) 0 8px 28px;
            --kaiyun-font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', 'Source Han Sans CN', sans-serif;
            --kaiyun-font-num: 'DIN Alternate', 'Bebas Neue', 'Oswald', 'Arial Narrow', sans-serif;
            --kaiyun-section-pad: 72px;
            --kaiyun-section-pad-mobile: 40px;
            --kaiyun-card-gap: 24px;
            --kaiyun-transition: all 0.25s ease;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--kaiyun-font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--kaiyun-text);
            background-color: var(--kaiyun-warm-white);
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--kaiyun-transition);
        }
        img {
            max-width: 100%;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--kaiyun-green);
            outline-offset: 2px;
        }
        .kaiyun-container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .kaiyun-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: var(--kaiyun-charcoal);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .kaiyun-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }
        .kaiyun-logo {
            font-size: 1.45rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            letter-spacing: 0.06em;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .kaiyun-logo-mark {
            display: inline-block;
            width: 22px;
            height: 22px;
            border: 2px solid var(--kaiyun-green);
            border-radius: 4px;
            position: relative;
            flex-shrink: 0;
        }
        .kaiyun-logo-mark::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) rotate(45deg);
            width: 10px;
            height: 10px;
            background-color: var(--kaiyun-green);
        }
        .kaiyun-nav-menu {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .kaiyun-nav-link {
            font-size: 0.95rem;
            color: var(--kaiyun-text-muted-light);
            letter-spacing: 0.03em;
            position: relative;
            padding: 6px 0;
            white-space: nowrap;
            transition: var(--kaiyun-transition);
        }
        .kaiyun-nav-link:hover {
            color: var(--kaiyun-green);
        }
        .kaiyun-nav-link.kaiyun-nav-active {
            color: var(--kaiyun-green);
        }
        .kaiyun-nav-link.kaiyun-nav-active::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 100%;
            height: 2px;
            background-color: var(--kaiyun-green);
            border-radius: 1px;
        }
        .kaiyun-nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 22px;
            border-radius: var(--kaiyun-radius-sm);
            white-space: nowrap;
            transition: var(--kaiyun-transition);
            border: 2px solid transparent;
        }
        .kaiyun-nav-cta:hover {
            background-color: var(--kaiyun-green-dark);
            box-shadow: 0 0 20px rgba(0, 230, 118, 0.35);
            transform: translateY(-1px);
        }
        .kaiyun-nav-cta:active {
            transform: translateY(0);
        }
        .kaiyun-mobile-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
        }
        .kaiyun-mobile-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background-color: var(--kaiyun-text-light);
            border-radius: 1px;
            transition: var(--kaiyun-transition);
        }
        .kaiyun-mobile-toggle:hover span {
            background-color: var(--kaiyun-green);
        }
        .kaiyun-mobile-menu {
            display: none;
            background-color: var(--kaiyun-charcoal-2);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 16px 24px 24px;
            flex-direction: column;
            gap: 12px;
        }
        .kaiyun-mobile-menu a {
            color: var(--kaiyun-text-light);
            font-size: 1rem;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-mobile-menu a:hover {
            color: var(--kaiyun-green);
        }
        .kaiyun-mobile-menu a.kaiyun-nav-cta {
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            text-align: center;
            border-bottom: none;
            padding: 12px 22px;
            border-radius: var(--kaiyun-radius-sm);
            margin-top: 8px;
        }
        .kaiyun-mobile-menu.open {
            display: flex;
        }
        .kaiyun-mobile-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .kaiyun-mobile-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .kaiyun-mobile-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* Banner */
        .kaiyun-cat-banner {
            position: relative;
            background-color: var(--kaiyun-charcoal);
            padding: 64px 0 72px;
            overflow: hidden;
            border-bottom: 3px solid var(--kaiyun-green);
        }
        .kaiyun-cat-banner::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: url('/assets/images/32fb8c9ea8ea89be.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            pointer-events: none;
        }
        .kaiyun-cat-banner::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(26,26,26,0.92) 0%, rgba(26,26,26,0.65) 60%, rgba(26,26,26,0.35) 100%);
            pointer-events: none;
        }
        .kaiyun-cat-banner-content {
            position: relative;
            z-index: 2;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .kaiyun-cat-banner-tag {
            display: inline-block;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-weight: 700;
            font-size: 0.75rem;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 16px;
        }
        .kaiyun-cat-banner h1 {
            font-size: clamp(2rem, 5vw, 3.2rem);
            font-weight: 800;
            color: var(--kaiyun-text-light);
            letter-spacing: 0.02em;
            line-height: 1.25;
            margin: 0 0 16px;
        }
        .kaiyun-cat-banner p {
            font-size: 1.05rem;
            color: var(--kaiyun-text-muted-light);
            max-width: 680px;
            line-height: 1.85;
            margin: 0;
        }

        /* Timeline */
        .kaiyun-timeline-section {
            padding: var(--kaiyun-section-pad) 0;
            background-color: var(--kaiyun-warm-white);
        }
        .kaiyun-timeline-section.dark {
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
        }
        .kaiyun-section-head {
            margin-bottom: 40px;
        }
        .kaiyun-section-tag {
            display: inline-block;
            background-color: rgba(0, 230, 118, 0.14);
            color: var(--kaiyun-green-dark);
            font-weight: 700;
            font-size: 0.75rem;
            letter-spacing: 0.12em;
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 10px;
        }
        .dark .kaiyun-section-tag {
            background-color: rgba(0, 230, 118, 0.12);
            color: var(--kaiyun-green);
        }
        .kaiyun-section-head h2 {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 700;
            color: var(--kaiyun-text);
            margin: 0;
            letter-spacing: 0.01em;
        }
        .dark .kaiyun-section-head h2 {
            color: var(--kaiyun-text-light);
        }
        .kaiyun-timeline {
            position: relative;
            padding-left: 32px;
            border-left: 2px solid var(--kaiyun-green);
            margin-left: 8px;
        }
        .kaiyun-timeline-item {
            position: relative;
            margin-bottom: 28px;
            padding: 20px 24px;
            background: #FFFFFF;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius);
            box-shadow: var(--kaiyun-shadow-light);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-timeline-item:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 0, 0, 0.12) 0 8px 30px;
            transform: translateX(4px);
        }
        .kaiyun-timeline-item::before {
            content: '';
            position: absolute;
            left: -41px;
            top: 24px;
            width: 16px;
            height: 16px;
            background-color: var(--kaiyun-green);
            border-radius: 50%;
            border: 3px solid var(--kaiyun-charcoal);
        }
        .kaiyun-timeline-date {
            font-family: var(--kaiyun-font-num);
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--kaiyun-charcoal);
            letter-spacing: 0.05em;
            margin-bottom: 4px;
        }
        .kaiyun-timeline-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--kaiyun-text);
            margin-bottom: 6px;
        }
        .kaiyun-timeline-meta {
            font-size: 0.85rem;
            color: var(--kaiyun-text-muted);
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            align-items: center;
        }
        .kaiyun-badge {
            display: inline-block;
            padding: 3px 12px;
            border-radius: 20px;
            font-size: 0.72rem;
            font-weight: 700;
            letter-spacing: 0.05em;
            white-space: nowrap;
        }
        .kaiyun-badge-green {
            background-color: rgba(0, 230, 118, 0.15);
            color: var(--kaiyun-green-dark);
        }
        .kaiyun-badge-coral {
            background-color: rgba(255, 109, 63, 0.12);
            color: var(--kaiyun-coral);
        }
        .kaiyun-badge-dark {
            background-color: rgba(26, 26, 26, 0.08);
            color: var(--kaiyun-text-muted);
        }

        /* Featured cards */
        .kaiyun-featured-section {
            padding: var(--kaiyun-section-pad) 0;
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
        }
        .kaiyun-featured-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--kaiyun-card-gap);
        }
        .kaiyun-featured-card {
            background-color: var(--kaiyun-charcoal-2);
            border: 1px solid var(--kaiyun-border-dark);
            border-radius: var(--kaiyun-radius-lg);
            overflow: hidden;
            transition: var(--kaiyun-transition);
        }
        .kaiyun-featured-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: var(--kaiyun-shadow-dark);
            transform: translateY(-4px);
        }
        .kaiyun-featured-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }
        .kaiyun-featured-card-body {
            padding: 20px 22px;
        }
        .kaiyun-featured-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            margin: 0 0 8px;
            line-height: 1.5;
        }
        .kaiyun-featured-card p {
            font-size: 0.88rem;
            color: var(--kaiyun-text-muted-light);
            margin: 0 0 12px;
            line-height: 1.7;
        }
        .kaiyun-featured-card .kaiyun-badge {
            display: inline-block;
        }

        /* Stats */
        .kaiyun-stats-section {
            padding: var(--kaiyun-section-pad) 0;
            background-color: var(--kaiyun-warm-white);
        }
        .kaiyun-stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--kaiyun-card-gap);
        }
        .kaiyun-stat-block {
            background: #FFFFFF;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius);
            padding: 24px 20px;
            text-align: center;
            box-shadow: var(--kaiyun-shadow-light);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-stat-block:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 0, 0, 0.12) 0 8px 30px;
            transform: translateY(-2px);
        }
        .kaiyun-stat-number {
            font-family: var(--kaiyun-font-num);
            font-size: 2.4rem;
            font-weight: 700;
            color: var(--kaiyun-charcoal);
            letter-spacing: 0.04em;
            line-height: 1.2;
        }
        .kaiyun-stat-number .kaiyun-stat-unit {
            font-size: 1rem;
            color: var(--kaiyun-text-muted);
            font-weight: 400;
        }
        .kaiyun-stat-label {
            font-size: 0.85rem;
            color: var(--kaiyun-text-muted);
            margin-top: 6px;
            letter-spacing: 0.03em;
        }

        /* Related topics */
        .kaiyun-topics-section {
            padding: var(--kaiyun-section-pad) 0;
            background-color: var(--kaiyun-warm-white);
        }
        .kaiyun-topics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--kaiyun-card-gap);
        }
        .kaiyun-topic-link {
            display: block;
            background: #FFFFFF;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius);
            padding: 20px 18px;
            box-shadow: var(--kaiyun-shadow-light);
            transition: var(--kaiyun-transition);
            text-align: center;
        }
        .kaiyun-topic-link:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 0, 0, 0.12) 0 8px 30px;
            transform: translateY(-4px);
        }
        .kaiyun-topic-link h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--kaiyun-text);
            margin: 0 0 4px;
        }
        .kaiyun-topic-link p {
            font-size: 0.78rem;
            color: var(--kaiyun-text-muted);
            margin: 0;
        }

        /* FAQ */
        .kaiyun-faq-section {
            padding: var(--kaiyun-section-pad) 0;
            background-color: var(--kaiyun-warm-white);
        }
        .kaiyun-faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .kaiyun-faq-item {
            background: #FFFFFF;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius);
            margin-bottom: 14px;
            overflow: hidden;
            transition: var(--kaiyun-transition);
        }
        .kaiyun-faq-item:hover {
            border-color: var(--kaiyun-green);
        }
        .kaiyun-faq-question {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 18px 22px;
            cursor: pointer;
            font-weight: 700;
            font-size: 0.98rem;
            color: var(--kaiyun-text);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--kaiyun-transition);
        }
        .kaiyun-faq-question:hover {
            color: var(--kaiyun-green-dark);
        }
        .kaiyun-faq-number {
            font-family: var(--kaiyun-font-num);
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--kaiyun-charcoal);
            flex-shrink: 0;
            min-width: 28px;
        }
        .kaiyun-faq-icon {
            margin-left: auto;
            flex-shrink: 0;
            font-size: 1.2rem;
            color: var(--kaiyun-green-dark);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-faq-item.open .kaiyun-faq-icon {
            transform: rotate(45deg);
        }
        .kaiyun-faq-answer {
            padding: 0 22px 18px 64px;
            font-size: 0.92rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.8;
            display: none;
        }
        .kaiyun-faq-item.open .kaiyun-faq-answer {
            display: block;
        }

        /* CTA */
        .kaiyun-cta-section {
            padding: var(--kaiyun-section-pad) 0;
            background-color: var(--kaiyun-charcoal);
            position: relative;
            overflow: hidden;
        }
        .kaiyun-cta-section::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 60%;
            height: 180%;
            background: radial-gradient(ellipse, rgba(0, 230, 118, 0.15) 0%, transparent 70%);
            pointer-events: none;
        }
        .kaiyun-cta-box {
            position: relative;
            z-index: 2;
            max-width: 640px;
            margin: 0 auto;
            text-align: center;
        }
        .kaiyun-cta-box h2 {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 700;
            color: var(--kaiyun-text-light);
            margin: 0 0 12px;
        }
        .kaiyun-cta-box p {
            font-size: 1rem;
            color: var(--kaiyun-text-muted-light);
            margin: 0 0 28px;
            line-height: 1.8;
        }
        .kaiyun-cta-form {
            display: flex;
            gap: 12px;
            max-width: 480px;
            margin: 0 auto;
            flex-wrap: wrap;
            justify-content: center;
        }
        .kaiyun-cta-form input {
            flex: 1 1 260px;
            padding: 14px 18px;
            border-radius: var(--kaiyun-radius-sm);
            border: 2px solid var(--kaiyun-border-dark);
            background-color: var(--kaiyun-charcoal-2);
            color: var(--kaiyun-text-light);
            font-size: 0.95rem;
            transition: var(--kaiyun-transition);
        }
        .kaiyun-cta-form input::placeholder {
            color: var(--kaiyun-text-muted-light);
        }
        .kaiyun-cta-form input:focus {
            border-color: var(--kaiyun-green);
            outline: none;
            box-shadow: 0 0 0 2px rgba(0, 230, 118, 0.25);
        }
        .kaiyun-btn-green {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-weight: 700;
            font-size: 0.9rem;
            padding: 14px 28px;
            border-radius: var(--kaiyun-radius-sm);
            border: none;
            cursor: pointer;
            transition: var(--kaiyun-transition);
            white-space: nowrap;
        }
        .kaiyun-btn-green:hover {
            background-color: var(--kaiyun-green-dark);
            box-shadow: 0 0 24px rgba(0, 230, 118, 0.4);
            transform: translateY(-2px);
        }
        .kaiyun-btn-green:active {
            transform: translateY(0);
        }

        /* Footer */
        .kaiyun-footer {
            background-color: var(--kaiyun-charcoal);
            padding: 56px 0 32px;
            color: var(--kaiyun-text-muted-light);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .kaiyun-footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .kaiyun-footer-brand {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            letter-spacing: 0.06em;
            margin-bottom: 12px;
        }
        .kaiyun-footer-text {
            font-size: 0.85rem;
            color: var(--kaiyun-text-muted-light);
            line-height: 1.8;
            max-width: 300px;
            margin: 0;
        }
        .kaiyun-footer-col h4 {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            letter-spacing: 0.05em;
            margin: 0 0 14px;
        }
        .kaiyun-footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .kaiyun-footer-col ul li {
            margin-bottom: 8px;
        }
        .kaiyun-footer-col ul a {
            font-size: 0.85rem;
            color: var(--kaiyun-text-muted-light);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-footer-col ul a:hover {
            color: var(--kaiyun-green);
        }
        .kaiyun-footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            font-size: 0.78rem;
            color: var(--kaiyun-text-muted-light);
            align-items: center;
            justify-content: space-between;
        }
        .kaiyun-footer-bottom-links {
            display: flex;
            gap: 8px;
            align-items: center;
        }
        .kaiyun-footer-bottom-links a {
            color: var(--kaiyun-text-muted-light);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-footer-bottom-links a:hover {
            color: var(--kaiyun-green);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .kaiyun-featured-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .kaiyun-stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .kaiyun-topics-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .kaiyun-footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 768px) {
            .kaiyun-nav-menu {
                display: none;
            }
            .kaiyun-nav-cta {
                display: none;
            }
            .kaiyun-mobile-toggle {
                display: flex;
            }
            .kaiyun-cat-banner {
                padding: 40px 0 48px;
            }
            .kaiyun-timeline {
                padding-left: 20px;
                margin-left: 6px;
            }
            .kaiyun-timeline-item::before {
                left: -29px;
                top: 20px;
                width: 12px;
                height: 12px;
            }
            .kaiyun-featured-grid {
                grid-template-columns: 1fr;
            }
            .kaiyun-timeline-item {
                padding: 16px 16px;
            }
            .kaiyun-faq-question {
                padding: 14px 16px;
                font-size: 0.9rem;
            }
            .kaiyun-faq-answer {
                padding: 0 16px 14px 44px;
                font-size: 0.85rem;
            }
        }
        @media (max-width: 520px) {
            .kaiyun-container {
                padding: 0 16px;
            }
            .kaiyun-stats-grid {
                grid-template-columns: 1fr;
            }
            .kaiyun-topics-grid {
                grid-template-columns: 1fr;
            }
            .kaiyun-footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .kaiyun-footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .kaiyun-timeline {
                padding-left: 16px;
            }
            .kaiyun-timeline-item::before {
                left: -25px;
            }
            .kaiyun-section-head h2 {
                font-size: 1.3rem;
            }
        }

/* roulang page: category2 */
:root {
            --kaiyun-charcoal: #1A1A1A;
            --kaiyun-charcoal-2: #222222;
            --kaiyun-charcoal-3: #2D2D2D;
            --kaiyun-green: #00E676;
            --kaiyun-green-dark: #00C866;
            --kaiyun-warm-white: #F7F7F5;
            --kaiyun-coral: #FF6D3F;
            --kaiyun-text: #1A1A1A;
            --kaiyun-text-light: #F7F7F5;
            --kaiyun-text-muted: #6B6B66;
            --kaiyun-text-muted-light: #B8B8B2;
            --kaiyun-border: #E8E8E4;
            --kaiyun-border-dark: #3A3A3A;
            --kaiyun-radius: 12px;
            --kaiyun-radius-sm: 8px;
            --kaiyun-radius-lg: 16px;
            --kaiyun-shadow-light: rgba(0, 0, 0, 0.08) 0 6px 24px;
            --kaiyun-shadow-dark: rgba(0, 0, 0, 0.35) 0 8px 28px;
            --kaiyun-font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', 'Source Han Sans CN', sans-serif;
            --kaiyun-font-num: 'DIN Alternate', 'Bebas Neue', 'Oswald', 'Arial Narrow', sans-serif;
            --kaiyun-section-pad: 72px;
            --kaiyun-section-pad-mobile: 40px;
            --kaiyun-card-gap: 24px;
            --kaiyun-transition: all 0.25s ease;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--kaiyun-font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--kaiyun-text);
            background-color: var(--kaiyun-warm-white);
            overflow-x: hidden;
            margin: 0;
            padding: 0;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--kaiyun-transition);
        }

        img {
            max-width: 100%;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--kaiyun-green);
            outline-offset: 2px;
        }

        .kaiyun-container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header / Nav */
        .kaiyun-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: var(--kaiyun-charcoal);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .kaiyun-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }

        .kaiyun-logo {
            font-size: 1.45rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            letter-spacing: 0.06em;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }

        .kaiyun-logo-mark {
            display: inline-block;
            width: 22px;
            height: 22px;
            border: 2px solid var(--kaiyun-green);
            border-radius: 4px;
            position: relative;
            flex-shrink: 0;
        }

        .kaiyun-logo-mark::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) rotate(45deg);
            width: 10px;
            height: 10px;
            background-color: var(--kaiyun-green);
        }

        .kaiyun-nav-menu {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .kaiyun-nav-link {
            font-size: 0.95rem;
            color: var(--kaiyun-text-muted-light);
            letter-spacing: 0.03em;
            position: relative;
            padding: 6px 0;
            white-space: nowrap;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-nav-link:hover {
            color: var(--kaiyun-green);
        }

        .kaiyun-nav-link.kaiyun-nav-active {
            color: var(--kaiyun-green);
        }

        .kaiyun-nav-link.kaiyun-nav-active::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 100%;
            height: 2px;
            background-color: var(--kaiyun-green);
            border-radius: 1px;
        }

        .kaiyun-nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 22px;
            border-radius: var(--kaiyun-radius-sm);
            white-space: nowrap;
            transition: var(--kaiyun-transition);
            border: 2px solid transparent;
        }

        .kaiyun-nav-cta:hover {
            background-color: var(--kaiyun-green-dark);
            box-shadow: 0 0 20px rgba(0, 230, 118, 0.35);
            transform: translateY(-1px);
        }

        .kaiyun-nav-cta:active {
            transform: translateY(0);
        }

        .kaiyun-mobile-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
        }

        .kaiyun-mobile-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background-color: var(--kaiyun-text-light);
            border-radius: 1px;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-mobile-toggle:hover span {
            background-color: var(--kaiyun-green);
        }

        .kaiyun-mobile-menu {
            display: none;
            position: fixed;
            top: 68px;
            left: 0;
            right: 0;
            background-color: var(--kaiyun-charcoal);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            padding: 16px 24px;
            z-index: 99;
            flex-direction: column;
            gap: 12px;
        }

        .kaiyun-mobile-menu a {
            color: var(--kaiyun-text-muted-light);
            font-size: 1rem;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-mobile-menu a:hover {
            color: var(--kaiyun-green);
        }

        .kaiyun-mobile-menu a.kaiyun-nav-active {
            color: var(--kaiyun-green);
        }

        .kaiyun-mobile-menu .kaiyun-nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 22px;
            border-radius: var(--kaiyun-radius-sm);
            white-space: nowrap;
            transition: var(--kaiyun-transition);
            border: 2px solid transparent;
            text-align: center;
            justify-content: center;
        }

        .kaiyun-mobile-menu .kaiyun-nav-cta:hover {
            background-color: var(--kaiyun-green-dark);
        }

        /* Main sections */
        main {
            display: block;
        }

        section {
            padding-top: var(--kaiyun-section-pad);
            padding-bottom: var(--kaiyun-section-pad);
        }

        .kaiyun-section-dark {
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
        }

        .kaiyun-section-light {
            background-color: var(--kaiyun-warm-white);
            color: var(--kaiyun-text);
        }

        .kaiyun-section-alt {
            background-color: #EEF0EC;
        }

        /* Section headings */
        .kaiyun-section-heading {
            margin-bottom: 40px;
        }

        .kaiyun-section-heading h2 {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: 0.03em;
            line-height: 1.3;
        }

        .kaiyun-section-dark .kaiyun-section-heading h2 {
            color: var(--kaiyun-text-light);
        }

        .kaiyun-section-light .kaiyun-section-heading h2 {
            color: var(--kaiyun-text);
        }

        .kaiyun-section-heading .kaiyun-subtitle {
            font-size: 1rem;
            color: var(--kaiyun-text-muted);
            margin-top: 8px;
        }

        .kaiyun-section-dark .kaiyun-section-heading .kaiyun-subtitle {
            color: var(--kaiyun-text-muted-light);
        }

        /* Banner */
        .kaiyun-banner {
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
            padding: 80px 0 60px;
            position: relative;
            overflow: hidden;
            background-image: url('/assets/images/32fb8c9ea8ea89be.webp');
            background-size: cover;
            background-position: center;
            min-height: 280px;
            display: flex;
            align-items: center;
        }

        .kaiyun-banner::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(180deg, rgba(26, 26, 26, 0.88) 0%, rgba(26, 26, 26, 0.72) 100%);
            z-index: 1;
        }

        .kaiyun-banner .kaiyun-container {
            position: relative;
            z-index: 2;
        }

        .kaiyun-banner h1 {
            font-size: 2.8rem;
            font-weight: 700;
            line-height: 1.2;
            letter-spacing: 0.02em;
            margin: 0 0 16px;
            color: #FFFFFF;
        }

        .kaiyun-banner p {
            font-size: 1.1rem;
            color: #D5D5D0;
            max-width: 720px;
            line-height: 1.8;
            margin: 0;
        }

        .kaiyun-banner-tag {
            display: inline-block;
            background-color: rgba(0, 230, 118, 0.15);
            color: var(--kaiyun-green);
            border: 1px solid rgba(0, 230, 118, 0.4);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            letter-spacing: 0.08em;
            margin-bottom: 16px;
        }

        /* Cards */
        .kaiyun-card {
            background-color: #FFFFFF;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius);
            box-shadow: var(--kaiyun-shadow-light);
            overflow: hidden;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
            transform: translateY(-2px);
        }

        .kaiyun-card-cover {
            position: relative;
            overflow: hidden;
        }

        .kaiyun-card-cover img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: transform 0.35s ease;
        }

        .kaiyun-card:hover .kaiyun-card-cover img {
            transform: scale(1.02);
        }

        .kaiyun-card-body {
            padding: 20px 24px;
        }

        .kaiyun-card-title {
            font-size: 1.2rem;
            font-weight: 700;
            margin: 0 0 8px;
            line-height: 1.4;
        }

        .kaiyun-card-text {
            font-size: 0.95rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.7;
            margin: 0 0 12px;
        }

        .kaiyun-tag {
            display: inline-block;
            background-color: rgba(0, 230, 118, 0.1);
            color: #00A85A;
            border: 1px solid rgba(0, 230, 118, 0.3);
            padding: 3px 10px;
            border-radius: 16px;
            font-size: 0.75rem;
            letter-spacing: 0.05em;
            font-weight: 600;
        }

        .kaiyun-tag-coral {
            display: inline-block;
            background-color: rgba(255, 109, 63, 0.1);
            color: #E54E2E;
            border: 1px solid rgba(255, 109, 63, 0.3);
            padding: 3px 10px;
            border-radius: 16px;
            font-size: 0.75rem;
            letter-spacing: 0.05em;
            font-weight: 600;
        }

        /* Dark cards */
        .kaiyun-section-dark .kaiyun-card {
            background-color: var(--kaiyun-charcoal-2);
            border-color: var(--kaiyun-border-dark);
            box-shadow: var(--kaiyun-shadow-dark);
        }

        .kaiyun-section-dark .kaiyun-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
        }

        .kaiyun-section-dark .kaiyun-card-title {
            color: var(--kaiyun-text-light);
        }

        .kaiyun-section-dark .kaiyun-card-text {
            color: var(--kaiyun-text-muted-light);
        }

        /* Feature list alternating cards */
        .kaiyun-feature-list {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .kaiyun-feature-item {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: center;
            background-color: #FFFFFF;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius);
            box-shadow: var(--kaiyun-shadow-light);
            overflow: hidden;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-feature-item:hover {
            border-color: var(--kaiyun-green);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
        }

        .kaiyun-feature-item-content {
            padding: 32px 36px;
        }

        .kaiyun-feature-item-image img {
            width: 100%;
            height: 260px;
            object-fit: cover;
        }

        .kaiyun-feature-item-title {
            font-size: 1.35rem;
            font-weight: 700;
            margin: 0 0 10px;
            line-height: 1.4;
        }

        .kaiyun-feature-item-text {
            font-size: 0.95rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.7;
            margin: 0 0 14px;
        }

        .kaiyun-feature-item:nth-child(even) {
            grid-template-columns: 1fr 1fr;
        }

        .kaiyun-feature-item:nth-child(even) .kaiyun-feature-item-image {
            order: 1;
        }

        .kaiyun-feature-item:nth-child(even) .kaiyun-feature-item-content {
            order: 2;
        }

        /* Data stat bars */
        .kaiyun-stat-bars {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .kaiyun-stat-bar-item {
            background-color: #FFFFFF;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius-sm);
            padding: 16px 20px;
            display: flex;
            align-items: center;
            gap: 16px;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-stat-bar-item:hover {
            border-color: var(--kaiyun-green);
        }

        .kaiyun-stat-bar-label {
            font-weight: 600;
            font-size: 0.9rem;
            white-space: nowrap;
            min-width: 140px;
            color: var(--kaiyun-text);
        }

        .kaiyun-stat-bar-track {
            flex: 1;
            height: 10px;
            background-color: #E8E8E4;
            border-radius: 5px;
            overflow: hidden;
            position: relative;
        }

        .kaiyun-stat-bar-fill {
            height: 100%;
            background-color: var(--kaiyun-green);
            border-radius: 5px;
            transition: width 1s ease;
        }

        .kaiyun-stat-bar-value {
            font-family: var(--kaiyun-font-num);
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--kaiyun-charcoal);
            white-space: nowrap;
            min-width: 60px;
            text-align: right;
        }

        /* Report cards */
        .kaiyun-report-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .kaiyun-report-card {
            background-color: #FFFFFF;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius);
            box-shadow: var(--kaiyun-shadow-light);
            overflow: hidden;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-report-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
            transform: translateY(-2px);
        }

        .kaiyun-report-card .kaiyun-card-cover img {
            height: 180px;
        }

        .kaiyun-report-card .kaiyun-card-body {
            padding: 18px 20px;
        }

        /* Trend list */
        .kaiyun-trend-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .kaiyun-trend-item {
            display: flex;
            align-items: center;
            gap: 16px;
            background-color: #FFFFFF;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius-sm);
            padding: 16px 20px;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-trend-item:hover {
            border-color: var(--kaiyun-green);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
        }

        .kaiyun-trend-dot {
            width: 8px;
            height: 8px;
            background-color: var(--kaiyun-green);
            border-radius: 50%;
            flex-shrink: 0;
        }

        .kaiyun-trend-dot.coral {
            background-color: var(--kaiyun-coral);
        }

        .kaiyun-trend-content {
            flex: 1;
        }

        .kaiyun-trend-title {
            font-weight: 600;
            font-size: 0.95rem;
            margin: 0 0 4px;
        }

        .kaiyun-trend-meta {
            font-size: 0.8rem;
            color: var(--kaiyun-text-muted);
        }

        .kaiyun-trend-value {
            font-family: var(--kaiyun-font-num);
            font-weight: 700;
            font-size: 1.05rem;
            white-space: nowrap;
            color: var(--kaiyun-charcoal);
        }

        .kaiyun-trend-value.green {
            color: #00A85A;
        }

        .kaiyun-trend-value.coral {
            color: #E54E2E;
        }

        /* Related entries */
        .kaiyun-related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        .kaiyun-related-card {
            background-color: #FFFFFF;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius-sm);
            padding: 20px;
            text-align: center;
            transition: var(--kaiyun-transition);
            display: block;
        }

        .kaiyun-related-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
            transform: translateY(-2px);
        }

        .kaiyun-related-card .kaiyun-related-icon {
            font-size: 1.8rem;
            margin-bottom: 8px;
            display: block;
        }

        .kaiyun-related-card .kaiyun-related-title {
            font-weight: 700;
            font-size: 1rem;
            margin: 0 0 4px;
        }

        .kaiyun-related-card .kaiyun-related-desc {
            font-size: 0.8rem;
            color: var(--kaiyun-text-muted);
            margin: 0;
        }

        /* FAQ */
        .kaiyun-faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .kaiyun-faq-item {
            background-color: #FFFFFF;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius-sm);
            overflow: hidden;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-faq-item:hover {
            border-color: var(--kaiyun-green);
        }

        .kaiyun-faq-question {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 18px 20px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            color: var(--kaiyun-text);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-faq-question:hover {
            color: #00A85A;
        }

        .kaiyun-faq-number {
            font-family: var(--kaiyun-font-num);
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--kaiyun-green-dark);
            min-width: 32px;
        }

        .kaiyun-faq-answer {
            padding: 0 20px 18px 68px;
            font-size: 0.95rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.7;
            display: none;
        }

        .kaiyun-faq-item.open .kaiyun-faq-answer {
            display: block;
        }

        .kaiyun-faq-item.open {
            border-color: var(--kaiyun-green);
        }

        /* CTA / Form */
        .kaiyun-cta-band {
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
            padding: 56px 0;
            position: relative;
            overflow: hidden;
        }

        .kaiyun-cta-band::before {
            content: '';
            position: absolute;
            top: -60%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0, 230, 118, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }

        .kaiyun-cta-inner {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
            position: relative;
            z-index: 1;
        }

        .kaiyun-cta-inner h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin: 0 0 12px;
            color: #FFFFFF;
            line-height: 1.3;
        }

        .kaiyun-cta-inner p {
            font-size: 0.95rem;
            color: var(--kaiyun-text-muted-light);
            margin: 0 0 20px;
            line-height: 1.7;
        }

        .kaiyun-form-group {
            margin-bottom: 14px;
        }

        .kaiyun-form-group label {
            display: block;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--kaiyun-text-muted-light);
        }

        .kaiyun-form-group input {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--kaiyun-border-dark);
            border-radius: var(--kaiyun-radius-sm);
            background-color: var(--kaiyun-charcoal-2);
            color: var(--kaiyun-text-light);
            font-size: 0.9rem;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-form-group input:focus {
            outline: none;
            border-color: var(--kaiyun-green);
            box-shadow: 0 0 0 2px rgba(0, 230, 118, 0.2);
        }

        .kaiyun-form-group input::placeholder {
            color: #6B6B66;
        }

        .kaiyun-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-weight: 700;
            font-size: 0.95rem;
            padding: 12px 28px;
            border-radius: var(--kaiyun-radius-sm);
            border: none;
            cursor: pointer;
            transition: var(--kaiyun-transition);
            white-space: nowrap;
        }

        .kaiyun-btn:hover {
            background-color: var(--kaiyun-green-dark);
            box-shadow: 0 0 20px rgba(0, 230, 118, 0.35);
            transform: translateY(-1px);
        }

        .kaiyun-btn:active {
            transform: translateY(0);
        }

        .kaiyun-btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: transparent;
            color: var(--kaiyun-text-light);
            font-weight: 700;
            font-size: 0.95rem;
            padding: 10px 26px;
            border-radius: var(--kaiyun-radius-sm);
            border: 2px solid var(--kaiyun-text-muted-light);
            cursor: pointer;
            transition: var(--kaiyun-transition);
            white-space: nowrap;
        }

        .kaiyun-btn-outline:hover {
            border-color: var(--kaiyun-green);
            color: var(--kaiyun-green);
            background-color: rgba(0, 230, 118, 0.06);
        }

        /* Footer */
        .kaiyun-footer {
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-muted-light);
            padding: 48px 0 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .kaiyun-footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }

        .kaiyun-footer-brand {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            margin-bottom: 12px;
            letter-spacing: 0.05em;
        }

        .kaiyun-footer-text {
            font-size: 0.9rem;
            color: var(--kaiyun-text-muted-light);
            line-height: 1.7;
            margin: 0;
        }

        .kaiyun-footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            margin: 0 0 12px;
            letter-spacing: 0.05em;
        }

        .kaiyun-footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .kaiyun-footer-col ul li {
            margin-bottom: 8px;
        }

        .kaiyun-footer-col ul li a {
            font-size: 0.85rem;
            color: var(--kaiyun-text-muted-light);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-footer-col ul li a:hover {
            color: var(--kaiyun-green);
        }

        .kaiyun-footer-bottom {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px;
            padding-top: 16px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.8rem;
            color: #777772;
        }

        .kaiyun-footer-bottom-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .kaiyun-footer-bottom-links a {
            color: #777772;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-footer-bottom-links a:hover {
            color: var(--kaiyun-green);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .kaiyun-nav-menu {
                gap: 20px;
            }

            .kaiyun-report-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .kaiyun-related-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .kaiyun-cta-inner {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .kaiyun-footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .kaiyun-nav-menu {
                display: none;
            }

            .kaiyun-nav-cta {
                display: none;
            }

            .kaiyun-mobile-toggle {
                display: flex;
            }

            .kaiyun-mobile-menu.active {
                display: flex;
            }

            .kaiyun-section-heading h2 {
                font-size: 1.5rem;
            }

            .kaiyun-banner h1 {
                font-size: 2rem;
            }

            .kaiyun-feature-item {
                grid-template-columns: 1fr;
            }

            .kaiyun-feature-item:nth-child(even) .kaiyun-feature-item-image {
                order: 0;
            }

            .kaiyun-feature-item:nth-child(even) .kaiyun-feature-item-content {
                order: 1;
            }

            .kaiyun-feature-item-image img {
                height: 200px;
            }

            .kaiyun-report-grid {
                grid-template-columns: 1fr;
            }

            .kaiyun-related-grid {
                grid-template-columns: 1fr 1fr;
            }

            .kaiyun-stat-bar-item {
                flex-wrap: wrap;
                gap: 8px;
            }

            .kaiyun-stat-bar-label {
                min-width: 100%;
            }

            .kaiyun-stat-bar-value {
                min-width: auto;
            }

            .kaiyun-footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            section {
                padding-top: var(--kaiyun-section-pad-mobile);
                padding-bottom: var(--kaiyun-section-pad-mobile);
            }
        }

        @media (max-width: 520px) {
            .kaiyun-container {
                padding: 0 16px;
            }

            .kaiyun-logo {
                font-size: 1.2rem;
            }

            .kaiyun-banner h1 {
                font-size: 1.6rem;
            }

            .kaiyun-banner p {
                font-size: 0.95rem;
            }

            .kaiyun-feature-item-content {
                padding: 20px;
            }

            .kaiyun-related-grid {
                grid-template-columns: 1fr;
            }

            .kaiyun-trend-item {
                flex-wrap: wrap;
                gap: 8px;
            }

            .kaiyun-footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

/* roulang page: category4 */
:root {
            --kaiyun-charcoal: #1A1A1A;
            --kaiyun-charcoal-2: #222222;
            --kaiyun-charcoal-3: #2D2D2D;
            --kaiyun-green: #00E676;
            --kaiyun-green-dark: #00C866;
            --kaiyun-warm-white: #F7F7F5;
            --kaiyun-coral: #FF6D3F;
            --kaiyun-text: #1A1A1A;
            --kaiyun-text-light: #F7F7F5;
            --kaiyun-text-muted: #6B6B66;
            --kaiyun-text-muted-light: #B8B8B2;
            --kaiyun-border: #E8E8E4;
            --kaiyun-border-dark: #3A3A3A;
            --kaiyun-radius: 12px;
            --kaiyun-radius-sm: 8px;
            --kaiyun-radius-lg: 16px;
            --kaiyun-shadow-light: rgba(0, 0, 0, 0.08) 0 6px 24px;
            --kaiyun-shadow-dark: rgba(0, 0, 0, 0.35) 0 8px 28px;
            --kaiyun-font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', 'Source Han Sans CN', sans-serif;
            --kaiyun-font-num: 'DIN Alternate', 'Bebas Neue', 'Oswald', 'Arial Narrow', sans-serif;
            --kaiyun-section-pad: 72px;
            --kaiyun-section-pad-mobile: 40px;
            --kaiyun-card-gap: 24px;
            --kaiyun-transition: all 0.25s ease;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--kaiyun-font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--kaiyun-text);
            background-color: var(--kaiyun-warm-white);
            overflow-x: hidden;
            margin: 0;
            padding: 0;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--kaiyun-transition);
        }

        img {
            max-width: 100%;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--kaiyun-green);
            outline-offset: 2px;
        }

        .kaiyun-container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header / Nav */
        .kaiyun-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: var(--kaiyun-charcoal);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .kaiyun-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }

        .kaiyun-logo {
            font-size: 1.45rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            letter-spacing: 0.06em;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }

        .kaiyun-logo-mark {
            display: inline-block;
            width: 22px;
            height: 22px;
            border: 2px solid var(--kaiyun-green);
            border-radius: 4px;
            position: relative;
            flex-shrink: 0;
        }

        .kaiyun-logo-mark::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) rotate(45deg);
            width: 10px;
            height: 10px;
            background-color: var(--kaiyun-green);
        }

        .kaiyun-nav-menu {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .kaiyun-nav-link {
            font-size: 0.95rem;
            color: var(--kaiyun-text-muted-light);
            letter-spacing: 0.03em;
            position: relative;
            padding: 6px 0;
            white-space: nowrap;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-nav-link:hover {
            color: var(--kaiyun-green);
        }

        .kaiyun-nav-link.kaiyun-nav-active {
            color: var(--kaiyun-green);
        }

        .kaiyun-nav-link.kaiyun-nav-active::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 100%;
            height: 2px;
            background-color: var(--kaiyun-green);
            border-radius: 1px;
        }

        .kaiyun-nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 22px;
            border-radius: var(--kaiyun-radius-sm);
            white-space: nowrap;
            transition: var(--kaiyun-transition);
            border: 2px solid transparent;
        }

        .kaiyun-nav-cta:hover {
            background-color: var(--kaiyun-green-dark);
            box-shadow: 0 0 20px rgba(0, 230, 118, 0.35);
            transform: translateY(-1px);
        }

        .kaiyun-nav-cta:active {
            transform: translateY(0);
        }

        .kaiyun-mobile-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
        }

        .kaiyun-mobile-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background-color: var(--kaiyun-text-light);
            border-radius: 1px;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-mobile-toggle:hover span {
            background-color: var(--kaiyun-green);
        }

        .kaiyun-mobile-menu {
            display: none;
            flex-direction: column;
            background-color: var(--kaiyun-charcoal-2);
            padding: 16px 24px 24px;
            gap: 4px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        .kaiyun-mobile-menu a {
            color: var(--kaiyun-text-light);
            padding: 10px 0;
            font-size: 1rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }

        .kaiyun-mobile-menu a:hover {
            color: var(--kaiyun-green);
        }

        .kaiyun-mobile-menu .kaiyun-nav-cta {
            margin-top: 12px;
            justify-content: center;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            border-radius: var(--kaiyun-radius-sm);
        }

        /* Section base */
        .kaiyun-section {
            padding: var(--kaiyun-section-pad) 0;
        }

        .kaiyun-section-dark {
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
        }

        .kaiyun-section-light {
            background-color: var(--kaiyun-warm-white);
            color: var(--kaiyun-text);
        }

        .kaiyun-section-muted {
            background-color: #f0f0ed;
            color: var(--kaiyun-text);
        }

        .kaiyun-section-title {
            font-size: 2.25rem;
            font-weight: 700;
            letter-spacing: -0.01em;
            margin-bottom: 12px;
            line-height: 1.25;
        }

        .kaiyun-section-subtitle {
            font-size: 1.05rem;
            color: var(--kaiyun-text-muted);
            margin-bottom: 40px;
            max-width: 680px;
            line-height: 1.75;
        }

        .kaiyun-section-dark .kaiyun-section-subtitle {
            color: var(--kaiyun-text-muted-light);
        }

        .kaiyun-section-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.82rem;
            font-weight: 700;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--kaiyun-green);
            margin-bottom: 16px;
        }

        .kaiyun-section-label::before {
            content: '';
            display: inline-block;
            width: 28px;
            height: 2px;
            background-color: var(--kaiyun-green);
            border-radius: 1px;
        }

        /* Buttons */
        .kaiyun-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
            font-size: 0.95rem;
            padding: 12px 28px;
            border-radius: var(--kaiyun-radius-sm);
            transition: var(--kaiyun-transition);
            cursor: pointer;
            border: 2px solid transparent;
            white-space: nowrap;
        }

        .kaiyun-btn-primary {
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
        }

        .kaiyun-btn-primary:hover {
            background-color: var(--kaiyun-green-dark);
            box-shadow: 0 0 24px rgba(0, 230, 118, 0.3);
            transform: translateY(-2px);
        }

        .kaiyun-btn-outline {
            background-color: transparent;
            border-color: var(--kaiyun-border-dark);
            color: var(--kaiyun-text-light);
        }

        .kaiyun-btn-outline:hover {
            border-color: var(--kaiyun-green);
            color: var(--kaiyun-green);
            background-color: rgba(0, 230, 118, 0.06);
        }

        .kaiyun-btn-dark-outline {
            background-color: transparent;
            border-color: var(--kaiyun-text-muted);
            color: var(--kaiyun-text);
        }

        .kaiyun-btn-dark-outline:hover {
            border-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-charcoal);
            background-color: rgba(0, 0, 0, 0.04);
        }

        /* Cards */
        .kaiyun-card {
            background-color: #ffffff;
            border-radius: var(--kaiyun-radius);
            border: 1px solid var(--kaiyun-border);
            overflow: hidden;
            transition: var(--kaiyun-transition);
            box-shadow: var(--kaiyun-shadow-light);
        }

        .kaiyun-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 0, 0, 0.12) 0 10px 32px;
            transform: translateY(-3px);
        }

        .kaiyun-card-dark {
            background-color: var(--kaiyun-charcoal-2);
            border: 1px solid var(--kaiyun-border-dark);
            box-shadow: var(--kaiyun-shadow-dark);
        }

        .kaiyun-card-dark:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 230, 118, 0.12) 0 10px 32px;
        }

        .kaiyun-card-image {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .kaiyun-card:hover .kaiyun-card-image {
            transform: scale(1.02);
        }

        .kaiyun-card-body {
            padding: 24px;
        }

        .kaiyun-card-title {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .kaiyun-card-text {
            color: var(--kaiyun-text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        /* Tags */
        .kaiyun-tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 0.78rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 20px;
            letter-spacing: 0.04em;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-tag-green {
            background-color: rgba(0, 230, 118, 0.12);
            color: #00A85A;
            border: 1px solid rgba(0, 230, 118, 0.3);
        }

        .kaiyun-tag-coral {
            background-color: rgba(255, 109, 63, 0.1);
            color: #E55A2D;
            border: 1px solid rgba(255, 109, 63, 0.25);
        }

        .kaiyun-tag-dark {
            background-color: rgba(255, 255, 255, 0.08);
            color: var(--kaiyun-text-muted-light);
            border: 1px solid rgba(255, 255, 255, 0.12);
        }

        /* Grid utilities */
        .kaiyun-grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--kaiyun-card-gap);
        }

        .kaiyun-grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--kaiyun-card-gap);
        }

        .kaiyun-grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--kaiyun-card-gap);
        }

        /* Banner */
        .kaiyun-category-banner {
            padding: 72px 0 56px;
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
            position: relative;
            overflow: hidden;
            border-bottom: 3px solid var(--kaiyun-green);
        }

        .kaiyun-category-banner::after {
            content: '';
            position: absolute;
            top: -120px;
            right: -80px;
            width: 360px;
            height: 360px;
            border: 2px solid rgba(0, 230, 118, 0.15);
            border-radius: 50%;
            pointer-events: none;
        }

        .kaiyun-category-banner::before {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -40px;
            width: 220px;
            height: 220px;
            border: 1px dashed rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            pointer-events: none;
        }

        .kaiyun-category-banner h1 {
            font-size: 2.8rem;
            font-weight: 700;
            letter-spacing: -0.01em;
            margin-bottom: 16px;
            position: relative;
            z-index: 1;
        }

        .kaiyun-category-banner p {
            font-size: 1.05rem;
            color: var(--kaiyun-text-muted-light);
            max-width: 720px;
            position: relative;
            z-index: 1;
        }

        /* List items */
        .kaiyun-service-list-item {
            display: flex;
            gap: 24px;
            padding: 20px 0;
            border-bottom: 1px solid var(--kaiyun-border);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-service-list-item:hover {
            padding-left: 8px;
            border-bottom-color: var(--kaiyun-green);
        }

        .kaiyun-service-list-number {
            font-family: var(--kaiyun-font-num);
            font-size: 2rem;
            font-weight: 700;
            color: var(--kaiyun-green);
            min-width: 56px;
            line-height: 1;
        }

        .kaiyun-service-list-content {
            flex: 1;
        }

        /* Stats */
        .kaiyun-stat-item {
            text-align: center;
            padding: 24px 16px;
            border-radius: var(--kaiyun-radius);
            background-color: var(--kaiyun-charcoal-2);
            border: 1px solid var(--kaiyun-border-dark);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-stat-item:hover {
            border-color: var(--kaiyun-green);
            transform: translateY(-2px);
        }

        .kaiyun-stat-number {
            font-family: var(--kaiyun-font-num);
            font-size: 2.6rem;
            font-weight: 700;
            color: var(--kaiyun-green);
            line-height: 1.2;
            margin-bottom: 8px;
        }

        .kaiyun-stat-label {
            font-size: 0.88rem;
            color: var(--kaiyun-text-muted-light);
            letter-spacing: 0.04em;
        }

        /* FAQ */
        .kaiyun-faq-item {
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius-sm);
            margin-bottom: 16px;
            overflow: hidden;
            transition: var(--kaiyun-transition);
            background-color: #ffffff;
        }

        .kaiyun-faq-item:hover {
            border-color: var(--kaiyun-green);
        }

        .kaiyun-faq-question {
            padding: 20px 24px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-weight: 600;
            font-size: 1rem;
            user-select: none;
            transition: var(--kaiyun-transition);
            background-color: #ffffff;
        }

        .kaiyun-faq-question:hover {
            color: var(--kaiyun-charcoal);
        }

        .kaiyun-faq-icon {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background-color: var(--kaiyun-warm-white);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--kaiyun-charcoal);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-faq-answer {
            padding: 0 24px 20px;
            color: var(--kaiyun-text-muted);
            font-size: 0.95rem;
            line-height: 1.75;
            display: none;
        }

        .kaiyun-faq-item.active .kaiyun-faq-answer {
            display: block;
        }

        .kaiyun-faq-item.active .kaiyun-faq-icon {
            background-color: var(--kaiyun-green);
            transform: rotate(45deg);
        }

        /* CTA form */
        .kaiyun-cta-banner {
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
            padding: 56px 0;
            position: relative;
            overflow: hidden;
        }

        .kaiyun-cta-banner::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 50%;
            height: 100%;
            background: linear-gradient(135deg, transparent 60%, rgba(0, 230, 118, 0.06) 60%);
            pointer-events: none;
        }

        .kaiyun-form-input {
            width: 100%;
            padding: 14px 18px;
            border-radius: var(--kaiyun-radius-sm);
            border: 1px solid var(--kaiyun-border-dark);
            background-color: var(--kaiyun-charcoal-2);
            color: var(--kaiyun-text-light);
            font-size: 0.95rem;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-form-input::placeholder {
            color: var(--kaiyun-text-muted-light);
        }

        .kaiyun-form-input:focus {
            border-color: var(--kaiyun-green);
            outline: 2px solid var(--kaiyun-green);
            outline-offset: 2px;
        }

        /* Footer */
        .kaiyun-footer {
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
            padding: 56px 0 24px;
            border-top: 3px solid var(--kaiyun-green);
        }

        .kaiyun-footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .kaiyun-footer-brand {
            font-size: 1.5rem;
            font-weight: 700;
            letter-spacing: 0.06em;
            margin-bottom: 12px;
        }

        .kaiyun-footer-text {
            color: var(--kaiyun-text-muted-light);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        .kaiyun-footer-col h4 {
            font-size: 0.9rem;
            font-weight: 700;
            letter-spacing: 0.06em;
            color: var(--kaiyun-green);
            margin-bottom: 16px;
        }

        .kaiyun-footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .kaiyun-footer-col li {
            margin-bottom: 8px;
        }

        .kaiyun-footer-col a {
            color: var(--kaiyun-text-muted-light);
            font-size: 0.9rem;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-footer-col a:hover {
            color: var(--kaiyun-green);
        }

        .kaiyun-footer-bottom {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.85rem;
            color: var(--kaiyun-text-muted-light);
        }

        .kaiyun-footer-bottom-links {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .kaiyun-footer-bottom-links a {
            color: var(--kaiyun-text-muted-light);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-footer-bottom-links a:hover {
            color: var(--kaiyun-green);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .kaiyun-grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .kaiyun-footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .kaiyun-nav-menu {
                gap: 20px;
            }
        }

        @media (max-width: 768px) {
            .kaiyun-nav-menu {
                display: none;
            }
            .kaiyun-nav-cta {
                display: none;
            }
            .kaiyun-mobile-toggle {
                display: flex;
            }
            .kaiyun-mobile-menu.open {
                display: flex;
            }
            .kaiyun-mobile-menu .kaiyun-nav-cta {
                display: flex;
            }
            .kaiyun-section {
                padding: var(--kaiyun-section-pad-mobile) 0;
            }
            .kaiyun-section-title {
                font-size: 1.75rem;
            }
            .kaiyun-category-banner h1 {
                font-size: 2rem;
            }
            .kaiyun-category-banner {
                padding: 48px 0 40px;
            }
            .kaiyun-grid-2,
            .kaiyun-grid-3,
            .kaiyun-grid-4 {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .kaiyun-service-list-item {
                flex-direction: column;
                gap: 8px;
            }
            .kaiyun-service-list-number {
                font-size: 1.5rem;
            }
            .kaiyun-footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .kaiyun-footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
            .kaiyun-stat-number {
                font-size: 2rem;
            }
        }

        @media (max-width: 520px) {
            .kaiyun-container {
                padding: 0 16px;
            }
            .kaiyun-section-title {
                font-size: 1.5rem;
            }
            .kaiyun-category-banner h1 {
                font-size: 1.65rem;
            }
            .kaiyun-btn {
                padding: 10px 20px;
                font-size: 0.88rem;
            }
            .kaiyun-card-body {
                padding: 18px;
            }
            .kaiyun-card-image {
                height: 160px;
            }
        }

/* Page-specific styles for brand-services */
        .kaiyun-service-image {
            height: 240px;
            object-fit: cover;
            width: 100%;
        }

        .kaiyun-service-list-image {
            width: 160px;
            height: 120px;
            object-fit: cover;
            border-radius: var(--kaiyun-radius-sm);
            flex-shrink: 0;
        }

        .kaiyun-service-number-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-family: var(--kaiyun-font-num);
            font-weight: 700;
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .kaiyun-timeline-item {
            display: flex;
            gap: 20px;
            padding: 16px 0;
            border-left: 2px solid var(--kaiyun-border);
            padding-left: 24px;
            position: relative;
        }

        .kaiyun-timeline-item::before {
            content: '';
            position: absolute;
            left: -7px;
            top: 28px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: var(--kaiyun-green);
            border: 2px solid var(--kaiyun-charcoal);
        }

        .kaiyun-benefit-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 16px 18px;
            border-radius: var(--kaiyun-radius-sm);
            background-color: var(--kaiyun-charcoal-2);
            border: 1px solid var(--kaiyun-border-dark);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-benefit-item:hover {
            border-color: var(--kaiyun-green);
        }

        .kaiyun-benefit-icon {
            width: 32px;
            height: 32px;
            border-radius: 6px;
            background-color: rgba(0, 230, 118, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 1.1rem;
            color: var(--kaiyun-green);
        }

        .kaiyun-link-card {
            display: block;
            padding: 20px;
            border-radius: var(--kaiyun-radius-sm);
            background-color: var(--kaiyun-charcoal-2);
            border: 1px solid var(--kaiyun-border-dark);
            transition: var(--kaiyun-transition);
            text-align: center;
        }

        .kaiyun-link-card:hover {
            border-color: var(--kaiyun-green);
            transform: translateY(-3px);
            box-shadow: rgba(0, 230, 118, 0.1) 0 8px 28px;
        }

        .kaiyun-link-card h3 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--kaiyun-text-light);
        }

        .kaiyun-link-card p {
            font-size: 0.82rem;
            color: var(--kaiyun-text-muted-light);
            line-height: 1.5;
        }

        @media (max-width: 768px) {
            .kaiyun-service-list-image {
                width: 100%;
                height: 180px;
            }
            .kaiyun-service-list-item {
                flex-direction: column;
            }
            .kaiyun-service-list-number {
                font-size: 1.6rem;
            }
            .kaiyun-benefit-item {
                flex-direction: row;
            }
        }

/* roulang page: category3 */
:root {
            --kaiyun-charcoal: #1A1A1A;
            --kaiyun-charcoal-2: #222222;
            --kaiyun-charcoal-3: #2D2D2D;
            --kaiyun-green: #00E676;
            --kaiyun-green-dark: #00C866;
            --kaiyun-warm-white: #F7F7F5;
            --kaiyun-coral: #FF6D3F;
            --kaiyun-text: #1A1A1A;
            --kaiyun-text-light: #F7F7F5;
            --kaiyun-text-muted: #6B6B66;
            --kaiyun-text-muted-light: #B8B8B2;
            --kaiyun-border: #E8E8E4;
            --kaiyun-border-dark: #3A3A3A;
            --kaiyun-radius: 12px;
            --kaiyun-radius-sm: 8px;
            --kaiyun-radius-lg: 16px;
            --kaiyun-shadow-light: rgba(0, 0, 0, 0.08) 0 6px 24px;
            --kaiyun-shadow-dark: rgba(0, 0, 0, 0.35) 0 8px 28px;
            --kaiyun-font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', 'Source Han Sans CN', sans-serif;
            --kaiyun-font-num: 'DIN Alternate', 'Bebas Neue', 'Oswald', 'Arial Narrow', sans-serif;
            --kaiyun-section-pad: 72px;
            --kaiyun-section-pad-mobile: 40px;
            --kaiyun-card-gap: 24px;
            --kaiyun-transition: all 0.25s ease;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--kaiyun-font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--kaiyun-text);
            background-color: var(--kaiyun-warm-white);
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--kaiyun-transition);
        }

        img {
            max-width: 100%;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--kaiyun-green);
            outline-offset: 2px;
        }

        .kaiyun-container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header / Nav */
        .kaiyun-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: var(--kaiyun-charcoal);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .kaiyun-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 16px;
        }

        .kaiyun-logo {
            font-size: 1.45rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            letter-spacing: 0.06em;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .kaiyun-logo-mark {
            display: inline-block;
            width: 22px;
            height: 22px;
            border: 2px solid var(--kaiyun-green);
            border-radius: 4px;
            position: relative;
            flex-shrink: 0;
        }

        .kaiyun-logo-mark::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) rotate(45deg);
            width: 10px;
            height: 10px;
            background-color: var(--kaiyun-green);
        }

        .kaiyun-nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
            flex-shrink: 1;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }

        .kaiyun-nav-menu::-webkit-scrollbar {
            display: none;
        }

        .kaiyun-nav-link {
            font-size: 0.95rem;
            color: var(--kaiyun-text-muted-light);
            letter-spacing: 0.03em;
            position: relative;
            padding: 6px 0;
            white-space: nowrap;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-nav-link:hover {
            color: var(--kaiyun-green);
        }

        .kaiyun-nav-link.kaiyun-nav-active {
            color: var(--kaiyun-green);
        }

        .kaiyun-nav-link.kaiyun-nav-active::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 100%;
            height: 2px;
            background-color: var(--kaiyun-green);
            border-radius: 1px;
        }

        .kaiyun-nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 22px;
            border-radius: var(--kaiyun-radius-sm);
            white-space: nowrap;
            transition: var(--kaiyun-transition);
            border: 2px solid transparent;
            flex-shrink: 0;
        }

        .kaiyun-nav-cta:hover {
            background-color: var(--kaiyun-green-dark);
            box-shadow: 0 0 20px rgba(0, 230, 118, 0.35);
            transform: translateY(-1px);
        }

        .kaiyun-nav-cta:active {
            transform: translateY(0);
        }

        .kaiyun-mobile-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            flex-shrink: 0;
        }

        .kaiyun-mobile-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background-color: var(--kaiyun-text-light);
            border-radius: 1px;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-mobile-toggle:hover span {
            background-color: var(--kaiyun-green);
        }

        .kaiyun-mobile-menu {
            display: none;
            background-color: var(--kaiyun-charcoal-2);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 16px 24px 24px;
            flex-direction: column;
            gap: 4px;
        }

        .kaiyun-mobile-menu a {
            color: var(--kaiyun-text-muted-light);
            font-size: 0.95rem;
            padding: 10px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-mobile-menu a:hover {
            color: var(--kaiyun-green);
        }

        .kaiyun-mobile-menu a.kaiyun-nav-active {
            color: var(--kaiyun-green);
        }

        .kaiyun-mobile-menu .kaiyun-nav-cta {
            margin-top: 12px;
            justify-content: center;
        }

        .kaiyun-mobile-menu.open {
            display: flex;
        }

        /* Category Banner */
        .kaiyun-cat-banner {
            position: relative;
            background-color: var(--kaiyun-charcoal);
            background-image: url('/assets/images/eab425c48b821217.webp');
            background-size: cover;
            background-position: center;
            padding: 64px 0 56px;
            overflow: hidden;
        }

        .kaiyun-cat-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(26, 26, 26, 0.88) 0%, rgba(26, 26, 26, 0.72) 55%, rgba(0, 230, 118, 0.22) 100%);
            z-index: 1;
        }

        .kaiyun-cat-banner::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--kaiyun-green) 0%, rgba(0, 230, 118, 0.3) 40%, transparent 70%);
            z-index: 2;
        }

        .kaiyun-cat-banner .kaiyun-container {
            position: relative;
            z-index: 3;
        }

        .kaiyun-cat-banner-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--kaiyun-green);
            letter-spacing: 0.08em;
            text-transform: uppercase;
            margin-bottom: 14px;
        }

        .kaiyun-cat-banner-label::before {
            content: '';
            width: 28px;
            height: 2px;
            background-color: var(--kaiyun-green);
        }

        .kaiyun-cat-banner h1 {
            font-size: clamp(1.8rem, 4vw, 2.7rem);
            font-weight: 700;
            color: var(--kaiyun-text-light);
            line-height: 1.3;
            letter-spacing: 0.02em;
            margin: 0 0 14px;
            max-width: 720px;
        }

        .kaiyun-cat-banner h1 .kaiyun-highlight {
            color: var(--kaiyun-green);
            position: relative;
        }

        .kaiyun-cat-banner p {
            font-size: 1.05rem;
            color: rgba(247, 247, 245, 0.78);
            line-height: 1.8;
            max-width: 640px;
            margin: 0;
        }

        /* Section shared */
        .kaiyun-section {
            padding: var(--kaiyun-section-pad) 0;
        }

        .kaiyun-section-dark {
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
        }

        .kaiyun-section-light {
            background-color: var(--kaiyun-warm-white);
        }

        .kaiyun-section-alt {
            background-color: #F0F0EC;
        }

        .kaiyun-section-header {
            margin-bottom: 40px;
        }

        .kaiyun-section-header h2 {
            font-size: clamp(1.5rem, 3vw, 2.1rem);
            font-weight: 700;
            line-height: 1.35;
            color: var(--kaiyun-text);
            margin: 0 0 10px;
            letter-spacing: 0.01em;
        }

        .kaiyun-section-dark .kaiyun-section-header h2 {
            color: var(--kaiyun-text-light);
        }

        .kaiyun-section-header p {
            font-size: 1rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.8;
            margin: 0;
            max-width: 680px;
        }

        .kaiyun-section-dark .kaiyun-section-header p {
            color: var(--kaiyun-text-muted-light);
        }

        /* Badge & Tag */
        .kaiyun-badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 0.78rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 100px;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .kaiyun-badge-green {
            background-color: rgba(0, 230, 118, 0.14);
            color: var(--kaiyun-green);
            border: 1px solid rgba(0, 230, 118, 0.3);
        }

        .kaiyun-badge-coral {
            background-color: rgba(255, 109, 63, 0.12);
            color: var(--kaiyun-coral);
            border: 1px solid rgba(255, 109, 63, 0.3);
        }

        .kaiyun-badge-dark {
            background-color: rgba(255, 255, 255, 0.08);
            color: var(--kaiyun-text-muted-light);
            border: 1px solid rgba(255, 255, 255, 0.12);
        }

        /* Buttons */
        .kaiyun-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
            font-size: 0.92rem;
            padding: 12px 28px;
            border-radius: var(--kaiyun-radius-sm);
            transition: var(--kaiyun-transition);
            cursor: pointer;
            border: 2px solid transparent;
        }

        .kaiyun-btn-primary {
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
        }

        .kaiyun-btn-primary:hover {
            background-color: var(--kaiyun-green-dark);
            box-shadow: 0 0 24px rgba(0, 230, 118, 0.4);
            transform: translateY(-2px);
        }

        .kaiyun-btn-outline {
            background: transparent;
            color: var(--kaiyun-charcoal);
            border-color: var(--kaiyun-charcoal);
        }

        .kaiyun-btn-outline:hover {
            background-color: rgba(26, 26, 26, 0.06);
            transform: translateY(-2px);
        }

        .kaiyun-btn-outline-light {
            background: transparent;
            color: var(--kaiyun-text-light);
            border-color: rgba(247, 247, 245, 0.5);
        }

        .kaiyun-btn-outline-light:hover {
            background-color: rgba(247, 247, 245, 0.1);
            border-color: var(--kaiyun-green);
            color: var(--kaiyun-green);
            transform: translateY(-2px);
        }

        .kaiyun-btn-text {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            font-size: 0.92rem;
            color: var(--kaiyun-green);
            transition: var(--kaiyun-transition);
            background: none;
            border: none;
            padding: 4px 0;
            cursor: pointer;
        }

        .kaiyun-btn-text:hover {
            color: var(--kaiyun-green-dark);
            gap: 12px;
        }

        /* Training tutorial list */
        .kaiyun-tutorial-list {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }

        .kaiyun-tutorial-item {
            display: flex;
            gap: 28px;
            background-color: #FFFFFF;
            border-radius: var(--kaiyun-radius-lg);
            border: 1px solid var(--kaiyun-border);
            padding: 28px;
            box-shadow: var(--kaiyun-shadow-light);
            transition: var(--kaiyun-transition);
            position: relative;
            overflow: hidden;
        }

        .kaiyun-tutorial-item:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 0, 0, 0.12) 0 10px 32px;
            transform: translateY(-3px);
        }

        .kaiyun-tutorial-step {
            flex-shrink: 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
            min-width: 64px;
        }

        .kaiyun-tutorial-step-num {
            font-family: var(--kaiyun-font-num);
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--kaiyun-charcoal);
            line-height: 1;
            letter-spacing: 0.02em;
            border-bottom: 3px solid var(--kaiyun-green);
            padding-bottom: 6px;
        }

        .kaiyun-tutorial-step-label {
            font-size: 0.72rem;
            font-weight: 600;
            color: var(--kaiyun-text-muted);
            letter-spacing: 0.06em;
            text-transform: uppercase;
            writing-mode: vertical-rl;
            text-orientation: mixed;
        }

        .kaiyun-tutorial-body {
            flex: 1;
            min-width: 0;
        }

        .kaiyun-tutorial-body h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--kaiyun-text);
            margin: 0 0 8px;
            line-height: 1.4;
        }

        .kaiyun-tutorial-body p {
            font-size: 0.95rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.8;
            margin: 0 0 14px;
        }

        .kaiyun-tutorial-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 14px;
        }

        .kaiyun-tutorial-meta span {
            font-size: 0.82rem;
            color: var(--kaiyun-text-muted);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .kaiyun-tutorial-img {
            flex-shrink: 0;
            width: 180px;
            height: 180px;
            border-radius: var(--kaiyun-radius);
            overflow: hidden;
            background-color: #EDEDE8;
        }

        .kaiyun-tutorial-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .kaiyun-tutorial-item:hover .kaiyun-tutorial-img img {
            transform: scale(1.04);
        }

        /* Featured cards */
        .kaiyun-featured-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--kaiyun-card-gap);
        }

        .kaiyun-featured-card {
            background-color: #FFFFFF;
            border-radius: var(--kaiyun-radius-lg);
            border: 1px solid var(--kaiyun-border);
            overflow: hidden;
            box-shadow: var(--kaiyun-shadow-light);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-featured-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: rgba(0, 0, 0, 0.12) 0 10px 32px;
            transform: translateY(-4px);
        }

        .kaiyun-featured-card-img {
            height: 180px;
            background-color: #EDEDE8;
            overflow: hidden;
        }

        .kaiyun-featured-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .kaiyun-featured-card:hover .kaiyun-featured-card-img img {
            transform: scale(1.04);
        }

        .kaiyun-featured-card-body {
            padding: 20px 22px 24px;
        }

        .kaiyun-featured-card-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--kaiyun-text);
            margin: 0 0 8px;
            line-height: 1.4;
        }

        .kaiyun-featured-card-body p {
            font-size: 0.9rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.7;
            margin: 0 0 14px;
        }

        /* Stats strip */
        .kaiyun-stats-strip {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 0;
            background-color: var(--kaiyun-charcoal-2);
            border-radius: var(--kaiyun-radius-lg);
            overflow: hidden;
            border: 1px solid var(--kaiyun-border-dark);
        }

        .kaiyun-stat-cell {
            padding: 28px 24px;
            text-align: center;
            border-right: 1px solid rgba(255, 255, 255, 0.06);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-stat-cell:last-child {
            border-right: none;
        }

        .kaiyun-stat-cell:hover {
            background-color: rgba(0, 230, 118, 0.05);
        }

        .kaiyun-stat-num {
            font-family: var(--kaiyun-font-num);
            font-size: 2.4rem;
            font-weight: 700;
            color: var(--kaiyun-green);
            line-height: 1;
            letter-spacing: 0.02em;
            margin-bottom: 6px;
        }

        .kaiyun-stat-label {
            font-size: 0.88rem;
            color: var(--kaiyun-text-muted-light);
            letter-spacing: 0.04em;
        }

        /* Related topics */
        .kaiyun-related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--kaiyun-card-gap);
        }

        .kaiyun-related-card {
            background-color: #FFFFFF;
            border-radius: var(--kaiyun-radius);
            border: 1px solid var(--kaiyun-border);
            padding: 22px;
            transition: var(--kaiyun-transition);
            text-align: left;
            box-shadow: rgba(0, 0, 0, 0.04) 0 3px 12px;
        }

        .kaiyun-related-card:hover {
            border-color: var(--kaiyun-green);
            box-shadow: var(--kaiyun-shadow-light);
            transform: translateY(-3px);
        }

        .kaiyun-related-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--kaiyun-text);
            margin: 0 0 6px;
        }

        .kaiyun-related-card p {
            font-size: 0.85rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.6;
            margin: 0;
        }

        /* FAQ */
        .kaiyun-faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 800px;
            margin: 0 auto;
        }

        .kaiyun-faq-item {
            background-color: #FFFFFF;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius);
            overflow: hidden;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-faq-item:hover {
            border-color: var(--kaiyun-green);
        }

        .kaiyun-faq-question {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 18px 22px;
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-family: var(--kaiyun-font-sans);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-faq-question:hover {
            background-color: rgba(0, 230, 118, 0.04);
        }

        .kaiyun-faq-num {
            font-family: var(--kaiyun-font-num);
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--kaiyun-green);
            flex-shrink: 0;
        }

        .kaiyun-faq-q-text {
            flex: 1;
            font-size: 1rem;
            font-weight: 600;
            color: var(--kaiyun-text);
            line-height: 1.5;
        }

        .kaiyun-faq-icon {
            flex-shrink: 0;
            width: 20px;
            height: 20px;
            position: relative;
            transition: transform 0.3s ease;
        }

        .kaiyun-faq-icon::before,
        .kaiyun-faq-icon::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background-color: var(--kaiyun-text-muted);
            border-radius: 2px;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-faq-icon::before {
            width: 16px;
            height: 2px;
        }

        .kaiyun-faq-icon::after {
            width: 2px;
            height: 16px;
        }

        .kaiyun-faq-item.active .kaiyun-faq-icon {
            transform: rotate(90deg);
        }

        .kaiyun-faq-item.active .kaiyun-faq-icon::after {
            opacity: 0;
        }

        .kaiyun-faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            padding: 0 22px;
        }

        .kaiyun-faq-item.active .kaiyun-faq-answer {
            max-height: 400px;
            padding: 0 22px 18px;
        }

        .kaiyun-faq-answer p {
            font-size: 0.92rem;
            color: var(--kaiyun-text-muted);
            line-height: 1.8;
            margin: 0;
            padding-top: 4px;
            border-top: 1px solid var(--kaiyun-border);
        }

        /* Subscription CTA */
        .kaiyun-subscribe-wrap {
            background-color: var(--kaiyun-charcoal);
            border-radius: var(--kaiyun-radius-lg);
            padding: 48px 40px;
            position: relative;
            overflow: hidden;
            box-shadow: var(--kaiyun-shadow-dark);
        }

        .kaiyun-subscribe-wrap::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -40px;
            width: 220px;
            height: 220px;
            border-radius: 50%;
            background: rgba(0, 230, 118, 0.08);
            pointer-events: none;
        }

        .kaiyun-subscribe-wrap::after {
            content: '';
            position: absolute;
            bottom: -30px;
            left: -30px;
            width: 140px;
            height: 140px;
            border-radius: 50%;
            border: 2px solid rgba(0, 230, 118, 0.15);
            pointer-events: none;
        }

        .kaiyun-subscribe-inner {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            gap: 32px;
            flex-wrap: wrap;
        }

        .kaiyun-subscribe-text {
            flex: 1;
            min-width: 260px;
        }

        .kaiyun-subscribe-text h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            margin: 0 0 8px;
        }

        .kaiyun-subscribe-text p {
            font-size: 0.95rem;
            color: var(--kaiyun-text-muted-light);
            margin: 0;
            line-height: 1.7;
        }

        .kaiyun-subscribe-form {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            min-width: 280px;
            flex: 1;
        }

        .kaiyun-subscribe-input {
            flex: 1;
            min-width: 200px;
            background-color: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--kaiyun-border-dark);
            border-radius: var(--kaiyun-radius-sm);
            padding: 12px 16px;
            color: var(--kaiyun-text-light);
            font-size: 0.92rem;
            transition: var(--kaiyun-transition);
        }

        .kaiyun-subscribe-input::placeholder {
            color: rgba(247, 247, 245, 0.4);
        }

        .kaiyun-subscribe-input:focus {
            outline: none;
            border-color: var(--kaiyun-green);
            box-shadow: 0 0 0 3px rgba(0, 230, 118, 0.15);
        }

        /* Footer */
        .kaiyun-footer {
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-muted-light);
            padding-top: 56px;
            margin-top: 0;
            border-top: 3px solid var(--kaiyun-green);
        }

        .kaiyun-footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 40px;
        }

        .kaiyun-footer-brand {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            letter-spacing: 0.06em;
            margin-bottom: 12px;
        }

        .kaiyun-footer-text {
            font-size: 0.88rem;
            color: var(--kaiyun-text-muted-light);
            line-height: 1.8;
            margin: 0;
            max-width: 320px;
        }

        .kaiyun-footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            margin: 0 0 14px;
            letter-spacing: 0.03em;
        }

        .kaiyun-footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .kaiyun-footer-col ul li {
            margin-bottom: 8px;
        }

        .kaiyun-footer-col ul li a {
            font-size: 0.88rem;
            color: var(--kaiyun-text-muted-light);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-footer-col ul li a:hover {
            color: var(--kaiyun-green);
        }

        .kaiyun-footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            padding: 18px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.82rem;
        }

        .kaiyun-footer-bottom-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .kaiyun-footer-bottom-links a {
            color: var(--kaiyun-text-muted-light);
            transition: var(--kaiyun-transition);
        }

        .kaiyun-footer-bottom-links a:hover {
            color: var(--kaiyun-green);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .kaiyun-tutorial-img {
                width: 140px;
                height: 140px;
            }

            .kaiyun-related-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .kaiyun-featured-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .kaiyun-footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .kaiyun-nav-menu {
                display: none;
            }

            .kaiyun-nav-cta {
                display: none;
            }

            .kaiyun-mobile-toggle {
                display: flex;
            }

            .kaiyun-section {
                padding: var(--kaiyun-section-pad-mobile) 0;
            }

            .kaiyun-cat-banner {
                padding: 48px 0 40px;
            }

            .kaiyun-tutorial-item {
                flex-direction: column;
                gap: 20px;
                padding: 20px;
            }

            .kaiyun-tutorial-step {
                flex-direction: row;
                align-items: center;
                gap: 10px;
                min-width: auto;
            }

            .kaiyun-tutorial-step-num {
                font-size: 1.8rem;
            }

            .kaiyun-tutorial-step-label {
                writing-mode: horizontal-tb;
                font-size: 0.75rem;
            }

            .kaiyun-tutorial-img {
                width: 100%;
                height: 200px;
            }

            .kaiyun-stats-strip {
                grid-template-columns: repeat(2, 1fr);
            }

            .kaiyun-stat-cell {
                padding: 20px 16px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            }

            .kaiyun-stat-cell:nth-child(2) {
                border-right: none;
            }

            .kaiyun-stat-cell:nth-child(3) {
                border-right: 1px solid rgba(255, 255, 255, 0.06);
                border-bottom: none;
            }

            .kaiyun-stat-cell:nth-child(4) {
                border-bottom: none;
            }

            .kaiyun-stat-num {
                font-size: 1.9rem;
            }

            .kaiyun-featured-grid {
                grid-template-columns: 1fr;
            }

            .kaiyun-related-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }

            .kaiyun-subscribe-wrap {
                padding: 32px 24px;
            }

            .kaiyun-subscribe-inner {
                flex-direction: column;
                align-items: flex-start;
            }

            .kaiyun-subscribe-form {
                width: 100%;
                flex-direction: column;
            }

            .kaiyun-subscribe-input {
                width: 100%;
            }

            .kaiyun-footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .kaiyun-footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                text-align: left;
            }
        }

        @media (max-width: 520px) {
            .kaiyun-container {
                padding: 0 16px;
            }

            .kaiyun-cat-banner h1 {
                font-size: 1.6rem;
            }

            .kaiyun-cat-banner p {
                font-size: 0.92rem;
            }

            .kaiyun-related-grid {
                grid-template-columns: 1fr;
            }

            .kaiyun-stats-strip {
                grid-template-columns: 1fr 1fr;
            }

            .kaiyun-stat-cell {
                padding: 16px 12px;
            }

            .kaiyun-stat-num {
                font-size: 1.6rem;
            }

            .kaiyun-faq-question {
                padding: 14px 16px;
                gap: 10px;
            }

            .kaiyun-faq-answer {
                padding: 0 16px;
            }

            .kaiyun-faq-item.active .kaiyun-faq-answer {
                padding: 0 16px 14px;
            }

            .kaiyun-subscribe-text h2 {
                font-size: 1.35rem;
            }

            .kaiyun-mobile-menu {
                padding: 12px 16px 20px;
            }
        }

/* roulang page: category5 */
:root {
            --kaiyun-charcoal: #1A1A1A;
            --kaiyun-charcoal-2: #222222;
            --kaiyun-charcoal-3: #2D2D2D;
            --kaiyun-green: #00E676;
            --kaiyun-green-dark: #00C866;
            --kaiyun-warm-white: #F7F7F5;
            --kaiyun-coral: #FF6D3F;
            --kaiyun-text: #1A1A1A;
            --kaiyun-text-light: #F7F7F5;
            --kaiyun-text-muted: #6B6B66;
            --kaiyun-text-muted-light: #B8B8B2;
            --kaiyun-border: #E8E8E4;
            --kaiyun-border-dark: #3A3A3A;
            --kaiyun-radius: 12px;
            --kaiyun-radius-sm: 8px;
            --kaiyun-radius-lg: 16px;
            --kaiyun-shadow-light: rgba(0, 0, 0, 0.08) 0 6px 24px;
            --kaiyun-shadow-dark: rgba(0, 0, 0, 0.35) 0 8px 28px;
            --kaiyun-font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', 'Source Han Sans CN', sans-serif;
            --kaiyun-font-num: 'DIN Alternate', 'Bebas Neue', 'Oswald', 'Arial Narrow', sans-serif;
            --kaiyun-section-pad: 72px;
            --kaiyun-section-pad-mobile: 40px;
            --kaiyun-card-gap: 24px;
            --kaiyun-transition: all 0.25s ease;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--kaiyun-font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--kaiyun-text);
            background-color: var(--kaiyun-warm-white);
            overflow-x: hidden;
            margin: 0;
            padding: 0;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--kaiyun-transition);
        }
        img {
            max-width: 100%;
            display: block;
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--kaiyun-green);
            outline-offset: 2px;
        }
        .kaiyun-container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header / Nav */
        .kaiyun-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: var(--kaiyun-charcoal);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .kaiyun-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }
        .kaiyun-logo {
            font-size: 1.45rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            letter-spacing: 0.06em;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .kaiyun-logo-mark {
            display: inline-block;
            width: 22px;
            height: 22px;
            border: 2px solid var(--kaiyun-green);
            border-radius: 4px;
            position: relative;
            flex-shrink: 0;
        }
        .kaiyun-logo-mark::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) rotate(45deg);
            width: 10px;
            height: 10px;
            background-color: var(--kaiyun-green);
        }
        .kaiyun-nav-menu {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .kaiyun-nav-link {
            font-size: 0.95rem;
            color: var(--kaiyun-text-muted-light);
            letter-spacing: 0.03em;
            position: relative;
            padding: 6px 0;
            white-space: nowrap;
            transition: var(--kaiyun-transition);
        }
        .kaiyun-nav-link:hover {
            color: var(--kaiyun-green);
        }
        .kaiyun-nav-link.kaiyun-nav-active {
            color: var(--kaiyun-green);
        }
        .kaiyun-nav-link.kaiyun-nav-active::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 100%;
            height: 2px;
            background-color: var(--kaiyun-green);
            border-radius: 1px;
        }
        .kaiyun-nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 22px;
            border-radius: var(--kaiyun-radius-sm);
            white-space: nowrap;
            transition: var(--kaiyun-transition);
            border: 2px solid transparent;
        }
        .kaiyun-nav-cta:hover {
            background-color: var(--kaiyun-green-dark);
            box-shadow: 0 0 20px rgba(0, 230, 118, 0.35);
            transform: translateY(-1px);
        }
        .kaiyun-nav-cta:active {
            transform: translateY(0);
        }
        .kaiyun-mobile-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
        }
        .kaiyun-mobile-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background-color: var(--kaiyun-text-light);
            border-radius: 1px;
            transition: var(--kaiyun-transition);
        }
        .kaiyun-mobile-toggle:hover span {
            background-color: var(--kaiyun-green);
        }
        .kaiyun-mobile-menu {
            display: none;
            background-color: var(--kaiyun-charcoal-2);
            padding: 16px 24px 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .kaiyun-mobile-menu a {
            display: block;
            color: var(--kaiyun-text-light);
            padding: 12px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 1rem;
            transition: var(--kaiyun-transition);
        }
        .kaiyun-mobile-menu a:hover {
            color: var(--kaiyun-green);
        }
        .kaiyun-mobile-menu .kaiyun-nav-cta {
            margin-top: 16px;
            display: flex;
            justify-content: center;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-weight: 700;
            padding: 12px;
            border-radius: var(--kaiyun-radius-sm);
            text-align: center;
        }

        /* Footer */
        .kaiyun-footer {
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-muted-light);
            padding: 60px 0 30px;
            margin-top: 0;
        }
        .kaiyun-footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .kaiyun-footer-brand {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--kaiyun-text-light);
            letter-spacing: 0.06em;
        }
        .kaiyun-footer-text {
            font-size: 0.95rem;
            color: var(--kaiyun-text-muted-light);
            margin-top: 12px;
            line-height: 1.8;
        }
        .kaiyun-footer-col h4 {
            color: var(--kaiyun-text-light);
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .kaiyun-footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .kaiyun-footer-col ul li {
            margin-bottom: 10px;
        }
        .kaiyun-footer-col ul li a {
            color: var(--kaiyun-text-muted-light);
            font-size: 0.9rem;
            transition: var(--kaiyun-transition);
        }
        .kaiyun-footer-col ul li a:hover {
            color: var(--kaiyun-green);
        }
        .kaiyun-footer-bottom {
            border-top: 1px solid var(--kaiyun-border-dark);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px 24px;
            font-size: 0.85rem;
            color: var(--kaiyun-text-muted-light);
        }
        .kaiyun-footer-bottom-links {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-left: auto;
        }
        .kaiyun-footer-bottom-links a {
            color: var(--kaiyun-text-muted-light);
            transition: var(--kaiyun-transition);
        }
        .kaiyun-footer-bottom-links a:hover {
            color: var(--kaiyun-green);
        }

        /* 品牌服务特有样式 */
        .brand-banner {
            padding: 48px 0 40px;
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
            position: relative;
            overflow: hidden;
        }
        .brand-banner::after {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 40%;
            height: 100%;
            background: linear-gradient(270deg, rgba(0, 230, 118, 0.08) 0%, rgba(0, 230, 118, 0) 100%);
            pointer-events: none;
        }
        .brand-banner-content {
            position: relative;
            z-index: 1;
            max-width: 780px;
        }
        .brand-banner h1 {
            font-size: 2.2rem;
            font-weight: 700;
            letter-spacing: 0.03em;
            margin: 0 0 12px;
            color: var(--kaiyun-text-light);
        }
        .brand-banner h1 span {
            color: var(--kaiyun-green);
        }
        .brand-banner p {
            font-size: 1rem;
            color: var(--kaiyun-text-muted-light);
            line-height: 1.8;
            margin: 0;
        }

        /* 主体卡片列表 */
        .service-list-section {
            padding: var(--kaiyun-section-pad) 0;
            background-color: var(--kaiyun-warm-white);
        }
        .service-card-large {
            display: flex;
            background-color: #fff;
            border-radius: var(--kaiyun-radius);
            overflow: hidden;
            box-shadow: var(--kaiyun-shadow-light);
            margin-bottom: var(--kaiyun-card-gap);
            border: 1px solid var(--kaiyun-border);
            transition: var(--kaiyun-transition);
        }
        .service-card-large:hover {
            border-color: var(--kaiyun-green);
            box-shadow: var(--kaiyun-shadow-dark);
        }
        .service-card-large .service-card-image {
            width: 320px;
            flex-shrink: 0;
            background-color: var(--kaiyun-charcoal-2);
            position: relative;
            overflow: hidden;
        }
        .service-card-large .service-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .service-card-large:hover .service-card-image img {
            transform: scale(1.02);
        }
        .service-card-large .service-card-body {
            padding: 28px 32px;
            flex: 1;
        }
        .service-card-large .service-card-body h3 {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--kaiyun-text);
            margin: 0 0 8px;
        }
        .service-card-large .service-card-body p {
            color: var(--kaiyun-text-muted);
            line-height: 1.8;
            margin: 0 0 16px;
        }
        .service-card-tag {
            display: inline-block;
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: 20px;
            letter-spacing: 0.04em;
        }

        /* 精选推荐 */
        .featured-section {
            padding: var(--kaiyun-section-pad) 0;
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
        }
        .featured-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: var(--kaiyun-card-gap);
        }
        .featured-card {
            background-color: var(--kaiyun-charcoal-2);
            border: 1px solid var(--kaiyun-border-dark);
            border-radius: var(--kaiyun-radius);
            overflow: hidden;
            transition: var(--kaiyun-transition);
        }
        .featured-card:hover {
            border-color: var(--kaiyun-green);
        }
        .featured-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        .featured-card-body {
            padding: 20px;
        }
        .featured-card-body h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin: 0 0 8px;
            color: var(--kaiyun-text-light);
        }
        .featured-card-body p {
            font-size: 0.9rem;
            color: var(--kaiyun-text-muted-light);
            margin: 0;
        }

        /* 统计数据 */
        .stats-section {
            padding: 56px 0;
            background-color: var(--kaiyun-warm-white);
        }
        .stats-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            justify-content: space-between;
        }
        .stat-item {
            flex: 1;
            min-width: 160px;
            background-color: #fff;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius);
            padding: 20px;
            text-align: center;
            box-shadow: var(--kaiyun-shadow-light);
        }
        .stat-number {
            font-family: var(--kaiyun-font-num);
            font-size: 2.4rem;
            font-weight: 700;
            color: var(--kaiyun-green);
            letter-spacing: 0.02em;
        }
        .stat-label {
            font-size: 0.9rem;
            color: var(--kaiyun-text-muted);
            margin-top: 4px;
        }

        /* 相关专题入口 */
        .related-section {
            padding: var(--kaiyun-section-pad) 0;
            background-color: var(--kaiyun-warm-white);
        }
        .related-links {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }
        .related-links a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: #fff;
            border: 1px solid var(--kaiyun-border);
            border-radius: 30px;
            padding: 10px 20px;
            color: var(--kaiyun-text);
            font-weight: 500;
            transition: var(--kaiyun-transition);
        }
        .related-links a:hover {
            border-color: var(--kaiyun-green);
            color: var(--kaiyun-green);
            box-shadow: var(--kaiyun-shadow-light);
        }

        /* 查看更多 */
        .view-more-section {
            padding: 32px 0;
            background-color: var(--kaiyun-charcoal);
            text-align: center;
        }
        .view-more-link {
            display: inline-block;
            color: var(--kaiyun-green);
            font-weight: 600;
            font-size: 1rem;
            padding: 10px 24px;
            border: 1px solid var(--kaiyun-green);
            border-radius: var(--kaiyun-radius-sm);
            transition: var(--kaiyun-transition);
        }
        .view-more-link:hover {
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
        }

        /* FAQ */
        .faq-section {
            padding: var(--kaiyun-section-pad) 0;
            background-color: var(--kaiyun-warm-white);
        }
        .faq-item {
            background-color: #fff;
            border: 1px solid var(--kaiyun-border);
            border-radius: var(--kaiyun-radius);
            margin-bottom: 16px;
            overflow: hidden;
        }
        .faq-question {
            padding: 20px 24px;
            font-weight: 600;
            color: var(--kaiyun-text);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }
        .faq-question::after {
            content: '+';
            font-size: 1.4rem;
            color: var(--kaiyun-green);
            transition: var(--kaiyun-transition);
        }
        .faq-item.active .faq-question::after {
            transform: rotate(45deg);
        }
        .faq-answer {
            display: none;
            padding: 0 24px 20px;
            color: var(--kaiyun-text-muted);
            line-height: 1.8;
        }
        .faq-item.active .faq-answer {
            display: block;
        }

        /* CTA 表单 */
        .cta-section {
            padding: var(--kaiyun-section-pad) 0;
            background-color: var(--kaiyun-charcoal);
            color: var(--kaiyun-text-light);
        }
        .cta-box {
            background-color: var(--kaiyun-charcoal-2);
            border: 1px solid var(--kaiyun-border-dark);
            border-radius: var(--kaiyun-radius-lg);
            padding: 40px;
            max-width: 720px;
            margin: 0 auto;
        }
        .cta-box h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin: 0 0 12px;
        }
        .cta-box p {
            color: var(--kaiyun-text-muted-light);
            margin: 0 0 24px;
        }
        .cta-form {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .cta-form input,
        .cta-form textarea {
            background-color: var(--kaiyun-charcoal-3);
            border: 1px solid var(--kaiyun-border-dark);
            border-radius: var(--kaiyun-radius-sm);
            padding: 12px 16px;
            color: var(--kaiyun-text-light);
            font-size: 0.95rem;
            transition: var(--kaiyun-transition);
        }
        .cta-form input:focus,
        .cta-form textarea:focus {
            border-color: var(--kaiyun-green);
            outline: none;
        }
        .cta-form textarea {
            resize: vertical;
            min-height: 100px;
        }
        .cta-form button {
            background-color: var(--kaiyun-green);
            color: var(--kaiyun-charcoal);
            font-weight: 700;
            padding: 14px;
            border: none;
            border-radius: var(--kaiyun-radius-sm);
            cursor: pointer;
            transition: var(--kaiyun-transition);
        }
        .cta-form button:hover {
            background-color: var(--kaiyun-green-dark);
            box-shadow: 0 0 24px rgba(0, 230, 118, 0.4);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .kaiyun-nav-menu {
                gap: 20px;
            }
            .service-card-large {
                flex-direction: column;
            }
            .service-card-large .service-card-image {
                width: 100%;
                height: 240px;
            }
            .featured-grid {
                grid-template-columns: 1fr 1fr;
            }
            .kaiyun-footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 768px) {
            .kaiyun-nav-menu {
                display: none;
            }
            .kaiyun-mobile-toggle {
                display: flex;
            }
            .kaiyun-nav-cta {
                display: none;
            }
            .kaiyun-mobile-menu {
                display: block;
            }
            .brand-banner h1 {
                font-size: 1.8rem;
            }
            .featured-grid {
                grid-template-columns: 1fr;
            }
            .stats-bar {
                gap: 16px;
            }
            .kaiyun-footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .kaiyun-footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
            .kaiyun-footer-bottom-links {
                margin-left: 0;
            }
        }
        @media (max-width: 520px) {
            .brand-banner {
                padding: 32px 0;
            }
            .brand-banner h1 {
                font-size: 1.6rem;
            }
            .brand-banner p {
                font-size: 0.9rem;
            }
            .kaiyun-container {
                padding: 0 16px;
            }
            .cta-box {
                padding: 24px;
            }
        }