/* roulang page: index */
:root {
        --brand-50: #F2F7FB;
        --brand-100: #E0ECF5;
        --brand-400: #5B9AC2;
        --brand-500: #337EAB;
        --brand-600: #255F83;
        --brand-800: #183A4D;
        --brand-900: #0F2735;
        --accent-400: #2FA09A;
        --accent-500: #1F7A74;
        --text-primary: #13293D;
        --text-body: #33485C;
        --text-secondary: #71879A;
        --border-light: #E6EEF5;
        --bg-alt: #F6FAFD;
        --radius-card: 16px;
        --radius-btn: 10px;
        --shadow-card: 0 8px 30px rgba(19, 41, 61, 0.07);
        --shadow-card-hover: 0 14px 36px rgba(19, 41, 61, 0.12);
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
        font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
        color: var(--text-body);
        background: #fff;
        line-height: 1.75;
        -webkit-font-smoothing: antialiased;
        text-rendering: optimizeLegibility;
    }
    a { color: var(--brand-500); text-decoration: none; transition: color .2s ease; }
    a:hover { color: var(--brand-600); }
    img { max-width: 100%; display: block; }
    button, input { font-family: inherit; }

    /* 导航链接 */
    .nav-link {
        position: relative;
        font-size: 15px;
        font-weight: 500;
        color: var(--text-body);
        padding: 6px 2px;
        transition: color .2s ease;
        letter-spacing: .01em;
    }
    .nav-link::after {
        content: '';
        position: absolute;
        left: 0;
        bottom: 0;
        width: 0;
        height: 2px;
        border-radius: 2px;
        background: var(--brand-500);
        transition: width .25s ease;
    }
    .nav-link:hover { color: var(--brand-600); }
    .nav-link:hover::after { width: 100%; }
    .nav-link.active { color: var(--brand-600); font-weight: 600; }
    .nav-link.active::after { width: 100%; }

    /* 按钮 */
    .btn-primary {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        background: var(--brand-500);
        color: #fff;
        font-size: 15px;
        font-weight: 600;
        padding: 12px 24px;
        border-radius: var(--radius-btn);
        border: none;
        cursor: pointer;
        transition: background .2s ease, transform .15s ease, box-shadow .2s ease;
        box-shadow: 0 4px 14px rgba(51, 126, 171, 0.25);
    }
    .btn-primary:hover {
        background: var(--brand-600);
        color: #fff;
        box-shadow: 0 6px 20px rgba(51, 126, 171, 0.35);
        transform: translateY(-1px);
    }
    .btn-primary:active { transform: scale(0.98); }
    .btn-primary:focus-visible {
        outline: none;
        box-shadow: 0 0 0 4px var(--brand-100), 0 4px 14px rgba(51, 126, 171, 0.25);
    }
    .btn-secondary {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        background: #fff;
        color: var(--brand-600);
        font-size: 15px;
        font-weight: 600;
        padding: 12px 24px;
        border-radius: var(--radius-btn);
        border: 1px solid #D7E5EF;
        cursor: pointer;
        transition: background .2s ease, transform .15s ease, border-color .2s ease;
    }
    .btn-secondary:hover {
        background: var(--brand-50);
        border-color: var(--brand-400);
        color: var(--brand-600);
        transform: translateY(-1px);
    }
    .btn-secondary:active { transform: scale(0.98); }
    .btn-secondary:focus-visible {
        outline: none;
        box-shadow: 0 0 0 4px var(--brand-100);
    }
    .btn-lg { padding: 14px 30px; font-size: 16px; }
    .btn-sm { padding: 8px 16px; font-size: 13px; border-radius: 8px; }

    /* 板块标签 */
    .section-tag {
        display: inline-block;
        background: var(--brand-50);
        color: var(--brand-500);
        font-size: 13px;
        font-weight: 600;
        padding: 4px 12px;
        border-radius: 20px;
        letter-spacing: .03em;
        margin-bottom: 10px;
        border: 1px solid var(--brand-100);
    }
    .section-title {
        font-size: 26px;
        font-weight: 700;
        color: var(--text-primary);
        letter-spacing: -0.02em;
        line-height: 1.3;
    }
    @media (max-width: 768px) {
        .section-title { font-size: 22px; }
    }

    /* Hero */
    .hero {
        position: relative;
        background-size: cover;
        background-position: center;
    }
    .hero-overlay {
        position: absolute;
        inset: 0;
        background: linear-gradient(90deg, rgba(15,39,53,0.95) 0%, rgba(24,58,77,0.80) 45%, rgba(24,58,77,0.40) 100%);
    }
    .official-badge {
        display: inline-flex;
        align-items: center;
        gap: 5px;
        background: rgba(255,255,255,0.14);
        backdrop-filter: blur(6px);
        border: 1px solid rgba(255,255,255,0.25);
        color: #fff;
        font-size: 13px;
        font-weight: 600;
        padding: 5px 14px;
        border-radius: 20px;
        letter-spacing: .06em;
    }
    .official-badge::before {
        content: '';
        width: 6px;
        height: 6px;
        border-radius: 50%;
        background: var(--accent-400);
        animation: pulse-dot 2s ease-in-out infinite;
    }
    @keyframes pulse-dot {
        0%, 100% { opacity: 1; transform: scale(1); }
        50% { opacity: .6; transform: scale(0.85); }
    }

    /* 倒计时 */
    .countdown-block {
        background: rgba(255,255,255,0.12);
        border: 1px solid rgba(255,255,255,0.18);
        backdrop-filter: blur(8px);
        border-radius: 12px;
        min-width: 72px;
        padding: 12px 8px;
        text-align: center;
    }
    .countdown-block span:first-child {
        display: block;
        font-size: 32px;
        font-weight: 700;
        color: #fff;
        line-height: 1;
        font-variant-numeric: tabular-nums;
        letter-spacing: .02em;
    }
    .countdown-block .countdown-label {
        display: block;
        font-size: 12px;
        color: rgba(255,255,255,0.6);
        margin-top: 6px;
        font-weight: 400;
    }
    .countdown-colon {
        color: rgba(255,255,255,0.4);
        font-size: 28px;
        font-weight: 300;
        align-self: center;
        padding-top: 18px;
    }
    @media (max-width: 480px) {
        .countdown-block { min-width: 60px; padding: 10px 6px; }
        .countdown-block span:first-child { font-size: 26px; }
    }

    /* 直播排期卡片 */
    .live-card {
        width: 320px;
        flex-shrink: 0;
        background: #fff;
        border-radius: var(--radius-card);
        overflow: hidden;
        border: 1px solid rgba(19,41,61,0.08);
        box-shadow: var(--shadow-card);
        transition: box-shadow .25s ease, transform .25s ease;
        scroll-snap-align: start;
    }
    .live-card:hover {
        box-shadow: var(--shadow-card-hover);
        transform: translateY(-3px);
    }
    .live-card.featured {
        border: 2px solid var(--brand-500);
        box-shadow: 0 10px 36px rgba(51,126,171,0.14);
    }
    .live-card.featured::before {
        content: '即将开播';
        position: absolute;
        top: 0;
        right: 0;
        background: var(--brand-500);
        color: #fff;
        font-size: 12px;
        font-weight: 600;
        padding: 4px 14px;
        border-radius: 0 0 0 12px;
        z-index: 2;
        letter-spacing: .04em;
    }
    .live-card .card-cover {
        position: relative;
        aspect-ratio: 16/10;
        overflow: hidden;
    }
    .live-card .card-cover img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform .4s ease;
    }
    .live-card:hover .card-cover img { transform: scale(1.05); }
    .live-card .card-date {
        position: absolute;
        left: 14px;
        bottom: 12px;
        background: rgba(15,39,53,0.80);
        backdrop-filter: blur(6px);
        color: #fff;
        font-size: 13px;
        font-weight: 500;
        padding: 4px 12px;
        border-radius: 20px;
        letter-spacing: .02em;
    }
    .live-card .card-body { padding: 18px; }
    .live-card .card-topic {
        font-size: 15px;
        font-weight: 600;
        color: var(--text-primary);
        line-height: 1.5;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        min-height: 45px;
    }
    .live-card .card-footer {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-top: 12px;
    }
    .live-card .card-time { font-size: 13px; color: var(--text-secondary); }
    .live-card .reserve-btn {
        background: var(--brand-50);
        border: 1px solid var(--brand-100);
        color: var(--brand-600);
        font-size: 13px;
        font-weight: 600;
        padding: 6px 16px;
        border-radius: 8px;
        transition: all .2s ease;
        cursor: pointer;
    }
    .live-card .reserve-btn:hover {
        background: var(--brand-500);
        color: #fff;
        border-color: var(--brand-500);
    }
    .featured .reserve-btn {
        background: var(--brand-500);
        border-color: var(--brand-500);
        color: #fff;
    }
    .featured .reserve-btn:hover {
        background: var(--brand-600);
        border-color: var(--brand-600);
    }
    @media (max-width: 768px) {
        .live-card { width: 75vw; }
    }

    /* 看点列表 */
    .highlight-row {
        display: flex;
        align-items: flex-start;
        gap: 18px;
        padding: 22px 24px;
        border-bottom: 1px solid var(--border-light);
        transition: background .2s ease;
    }
    .highlight-row:last-child { border-bottom: none; }
    .highlight-row:hover { background: #F4F9FC; }
    .highlight-num {
        width: 32px;
        height: 32px;
        flex-shrink: 0;
        border-radius: 10px;
        background: var(--brand-50);
        border: 1px solid var(--brand-100);
        color: var(--brand-500);
        font-size: 14px;
        font-weight: 700;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-top: 2px;
    }
    .highlight-num.hot { background: var(--accent-400); border-color: var(--accent-400); color: #fff; }
    .highlight-title { font-size: 16px; font-weight: 600; color: var(--text-primary); }
    .highlight-desc { font-size: 14px; color: var(--text-secondary); margin-top: 3px; line-height: 1.65; }

    /* 资讯列表 */
    .news-row {
        display: flex;
        align-items: center;
        gap: 20px;
        padding: 20px 24px;
        transition: background .2s ease;
        border-bottom: 1px solid var(--border-light);
    }
    .news-row:last-child { border-bottom: none; }
    .news-row:hover { background: #F4F9FC; }
    .news-date {
        min-width: 90px;
        font-size: 14px;
        font-weight: 600;
        color: var(--brand-500);
        font-variant-numeric: tabular-nums;
        line-height: 1.3;
    }
    .news-cat-badge {
        display: inline-block;
        background: var(--brand-50);
        border: 1px solid var(--brand-100);
        color: var(--brand-600);
        font-size: 12px;
        font-weight: 500;
        padding: 3px 10px;
        border-radius: 6px;
        white-space: nowrap;
        flex-shrink: 0;
    }
    .news-content { flex: 1; min-width: 0; }
    .news-title {
        font-size: 15px;
        font-weight: 600;
        color: var(--text-primary);
        line-height: 1.5;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        transition: color .2s ease;
    }
    .news-row:hover .news-title { color: var(--brand-500); }
    .news-summary {
        font-size: 13px;
        color: var(--text-secondary);
        margin-top: 3px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 480px;
    }
    .news-arrow { color: var(--brand-400); opacity: 0; transform: translateX(-6px); transition: all .2s ease; flex-shrink: 0; }
    .news-row:hover .news-arrow { opacity: 1; transform: translateX(0); }
    .empty-state {
        padding: 60px 24px;
        text-align: center;
        border: 2px dashed var(--border-light);
        border-radius: var(--radius-card);
        background: #FAFCFE;
        color: var(--text-secondary);
        font-size: 14px;
    }
    @media (max-width: 768px) {
        .news-row { flex-wrap: wrap; gap: 8px 14px; padding: 16px 18px; }
        .news-date { min-width: auto; font-size: 12px; order: 1; }
        .news-cat-badge { order: 2; font-size: 11px; }
        .news-content { order: 3; width: 100%; }
        .news-title { white-space: normal; -webkit-line-clamp: 2; display: -webkit-box; -webkit-box-orient: vertical; }
        .news-summary { white-space: normal; -webkit-line-clamp: 2; display: -webkit-box; -webkit-box-orient: vertical; max-width: none; }
        .news-arrow { display: none; }
    }

    /* 回放卡片 */
    .playback-card {
        width: 260px;
        flex-shrink: 0;
        border-radius: var(--radius-card);
        overflow: hidden;
        background: #fff;
        border: 1px solid rgba(19,41,61,0.08);
        box-shadow: var(--shadow-card);
        transition: box-shadow .25s ease, transform .25s ease;
    }
    .playback-card:hover {
        box-shadow: var(--shadow-card-hover);
        transform: translateY(-2px);
    }
    .playback-cover {
        position: relative;
        aspect-ratio: 16/10;
        overflow: hidden;
    }
    .playback-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
    .playback-card:hover .playback-cover img { transform: scale(1.04); }
    .playback-cover .play-btn {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 42px;
        height: 42px;
        background: rgba(255,255,255,0.92);
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--brand-500);
        transition: all .3s ease;
        box-shadow: 0 4px 14px rgba(0,0,0,0.18);
    }
    .playback-card:hover .play-btn {
        width: 56px;
        height: 56px;
        background: var(--brand-500);
        color: #fff;
    }
    .playback-info { padding: 14px 16px; }
    .playback-info h4 {
        font-size: 14px;
        font-weight: 600;
        color: var(--text-primary);
        line-height: 1.5;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    .playback-info .meta { font-size: 12px; color: var(--text-secondary); margin-top: 4px; display: flex; gap: 8px; align-items: center; }

    /* FAQ */
    .faq-item {
        background: #fff;
        border: 1px solid rgba(19,41,61,0.08);
        border-radius: var(--radius-card);
        margin-bottom: 14px;
        overflow: hidden;
        transition: border-color .25s ease, box-shadow .25s ease;
    }
    .faq-item.open {
        border-color: var(--brand-400);
        box-shadow: 0 6px 24px rgba(51,126,171,0.08);
    }
    .faq-question {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 14px;
        padding: 18px 22px;
        background: transparent;
        border: none;
        cursor: pointer;
        text-align: left;
        font-size: 16px;
        font-weight: 600;
        color: var(--text-primary);
        transition: background .2s ease;
    }
    .faq-question:hover { background: var(--brand-50); }
    .faq-icon {
        width: 24px;
        height: 24px;
        flex-shrink: 0;
        border-radius: 50%;
        background: var(--brand-50);
        border: 1px solid var(--brand-100);
        color: var(--brand-500);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 14px;
        font-weight: 400;
        transition: all .3s ease;
        line-height: 1;
    }
    .faq-item.open .faq-icon {
        background: var(--brand-500);
        color: #fff;
        border-color: var(--brand-500);
        transform: rotate(45deg);
    }
    .faq-answer {
        padding: 0 22px;
        max-height: 0;
        overflow: hidden;
        transition: max-height .35s ease, padding .25s ease;
        font-size: 14px;
        color: var(--text-body);
        line-height: 1.75;
    }
    .faq-item.open .faq-answer {
        max-height: 400px;
        padding: 0 22px 20px;
    }

    /* 页脚 */
    .footer {
        background: var(--brand-900);
        color: rgba(255,255,255,0.7);
        font-size: 14px;
    }
    .footer h4 {
        color: #fff;
        font-size: 15px;
        font-weight: 600;
        margin-bottom: 16px;
    }
    .footer a {
        color: rgba(255,255,255,0.6);
        display: inline-block;
        margin-bottom: 8px;
        transition: color .2s ease;
    }
    .footer a:hover { color: #fff; }
    .footer-bottom {
        border-top: 1px solid rgba(255,255,255,0.10);
        padding-top: 24px;
        margin-top: 48px;
        font-size: 13px;
        color: rgba(255,255,255,0.45);
    }

    /* 移动底部导航 */
    .mobile-tab-bar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 60;
        background: rgba(255,255,255,0.92);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-top: 1px solid rgba(19,41,61,0.08);
        display: none;
        padding-bottom: env(safe-area-inset-bottom);
        height: 60px;
    }
    .mobile-tab-bar .tab-item {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 3px;
        color: var(--text-secondary);
        font-size: 11px;
        transition: color .2s ease;
        position: relative;
        padding: 6px 0;
    }
    .mobile-tab-bar .tab-item svg { width: 20px; height: 20px; }
    .mobile-tab-bar .tab-item.active { color: var(--brand-500); font-weight: 600; }
    .mobile-tab-bar .tab-item.active::before {
        content: '';
        position: absolute;
        top: -1px;
        left: 50%;
        transform: translateX(-50%);
        width: 32px;
        height: 3px;
        border-radius: 0 0 4px 4px;
        background: var(--brand-500);
    }
    @media (max-width: 768px) {
        .mobile-tab-bar { display: flex; }
        body { padding-bottom: 60px; }
    }

    /* 无滚动条 */
    .no-scrollbar::-webkit-scrollbar { display: none; }
    .no-scrollbar { -ms-overflow-style: none; scrollbar-width: none; }

    /* 水平滚动提示 */
    .scroll-hint {
        position: absolute;
        right: 0;
        top: 50%;
        transform: translateY(-50%);
        width: 36px;
        height: 36px;
        border-radius: 50%;
        background: rgba(255,255,255,0.95);
        box-shadow: 0 4px 16px rgba(19,41,61,0.15);
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--brand-500);
        pointer-events: none;
        animation: hint-move 1.8s ease-in-out infinite;
    }
    @keyframes hint-move {
        0%, 100% { transform: translateY(-50%) translateX(0); opacity: .9; }
        50% { transform: translateY(-50%) translateX(4px); opacity: .4; }
    }

    /* 订阅表单 */
    .subscribe-input {
        width: 100%;
        padding: 13px 18px;
        border: 1px solid #D7E5EF;
        border-radius: var(--radius-btn);
        font-size: 14px;
        color: var(--text-primary);
        background: #fff;
        transition: border-color .2s ease, box-shadow .2s ease;
        outline: none;
    }
    .subscribe-input:focus {
        border-color: var(--brand-500);
        box-shadow: 0 0 0 4px var(--brand-100);
    }
    .subscribe-input::placeholder { color: #A9B7C4; }

    /* 水波纹理装饰 */
    .wave-divider {
        height: 40px;
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 40' preserveAspectRatio='none'%3E%3Cpath d='M0,20 C150,0 350,40 600,20 C850,0 1050,40 1200,20 L1200,40 L0,40 Z' fill='%23F6FAFD'/%3E%3C/svg%3E");
        background-size: cover;
        background-repeat: no-repeat;
        background-position: center top;
    }

    @media (min-width: 769px) {
        .desktop-only { display: block; }
    }

/* roulang page: category1 */
:root {
            --brand-50: #F2F7FB;
            --brand-100: #E0ECF5;
            --brand-400: #5B9AC2;
            --brand-500: #337EAB;
            --brand-600: #255F83;
            --brand-800: #183A4D;
            --brand-900: #122A3A;
            --accent-400: #2FA09A;
            --accent-500: #1F7A74;
            --text-primary: #13293D;
            --text-body: #33485C;
            --text-muted: #71879A;
            --border-light: rgba(19, 41, 61, 0.08);
            --line-light: #E6EEF5;
            --shadow-card: 0 8px 30px rgba(19, 41, 61, 0.07);
            --shadow-hover: 0 14px 36px rgba(19, 41, 61, 0.12);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
            color: var(--text-body);
            background: #FFFFFF;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

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

        button,
        input {
            font-family: inherit;
            outline: none;
        }

        .container-page {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            padding: 8px 2px;
            position: relative;
            transition: color 0.2s ease;
        }

        .nav-link:hover {
            color: var(--brand-500);
        }

        .nav-link.active {
            color: var(--brand-500);
            font-weight: 600;
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            height: 2px;
            background: var(--brand-500);
            border-radius: 2px;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background-color: var(--brand-500);
            color: #ffffff;
            font-weight: 600;
            padding: 12px 24px;
            border-radius: 10px;
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            box-shadow: 0 4px 14px rgba(51, 126, 171, 0.3);
        }

        .btn-primary:hover {
            background-color: var(--brand-600);
            transform: translateY(-1px);
            box-shadow: 0 8px 22px rgba(51, 126, 171, 0.4);
        }

        .btn-primary:focus {
            outline: none;
            box-shadow: 0 0 0 4px var(--brand-100), 0 4px 14px rgba(51, 126, 171, 0.3);
        }

        .btn-primary:active {
            transform: scale(0.98);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background-color: #ffffff;
            color: var(--brand-600);
            font-weight: 600;
            padding: 12px 24px;
            border-radius: 10px;
            border: 1px solid var(--brand-100);
            cursor: pointer;
            transition: all 0.25s ease;
        }

        .btn-secondary:hover {
            background-color: var(--brand-50);
            border-color: var(--brand-400);
        }

        .btn-secondary:focus {
            outline: none;
            box-shadow: 0 0 0 4px var(--brand-50);
        }

        .section-padding {
            padding: 72px 0;
        }

        .section-bg {
            background-color: var(--brand-50);
        }

        .u-card {
            background: #ffffff;
            border-radius: 16px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: all 0.3s ease;
        }

        .u-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }

        .faq-item {
            background: #ffffff;
            border: 1px solid var(--border-light);
            border-radius: 12px;
            margin-bottom: 12px;
            padding: 20px 24px;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
            cursor: pointer;
        }

        .faq-item.active {
            border-color: var(--brand-500);
            box-shadow: 0 0 0 3px rgba(51, 126, 171, 0.08);
        }

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .faq-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--brand-50);
            color: var(--brand-500);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            transition: transform 0.3s ease;
            flex-shrink: 0;
            margin-left: 12px;
        }

        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            background: var(--brand-500);
            color: #ffffff;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.8;
        }

        .faq-item.active .faq-answer {
            max-height: 400px;
            margin-top: 12px;
        }

        .footer {
            background: var(--brand-900);
            color: rgba(255, 255, 255, 0.7);
        }

        .footer h4 {
            color: #ffffff;
            font-size: 16px;
            margin-bottom: 16px;
            font-weight: 600;
        }

        .footer a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 14px;
            margin-bottom: 10px;
            transition: color 0.2s ease;
        }

        .footer a:hover {
            color: #ffffff;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 24px;
            margin-top: 48px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

        .step-item {
            display: flex;
            gap: 16px;
            padding: 20px 0;
            border-bottom: 1px solid var(--line-light);
        }

        .step-item:last-child {
            border-bottom: none;
        }

        .step-num {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: var(--brand-500);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 16px;
            flex-shrink: 0;
            margin-top: 2px;
        }

        .tip-card {
            background: var(--brand-50);
            border-radius: 12px;
            padding: 16px 20px;
            border-left: 3px solid var(--brand-400);
            font-size: 14px;
            line-height: 1.7;
        }

        .mobile-tab {
            display: none;
        }

        @media (max-width: 768px) {
            .section-padding {
                padding: 48px 0;
            }

            .desktop-nav {
                display: none;
            }

            .mobile-tab {
                display: flex;
                position: fixed;
                bottom: 0;
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.92);
                backdrop-filter: blur(12px);
                border-top: 1px solid var(--border-light);
                z-index: 100;
                padding-bottom: env(safe-area-inset-bottom);
                height: 60px;
            }

            .mobile-tab a {
                flex: 1;
                display: flex;
                flex-direction: column;
                align-items: center;
                justify-content: center;
                font-size: 11px;
                color: var(--text-muted);
                gap: 3px;
                transition: color 0.2s ease;
            }

            .mobile-tab a i {
                font-size: 20px;
            }

            .mobile-tab a.active {
                color: var(--brand-500);
            }

            .mobile-tab a.active::after {
                content: '';
                width: 4px;
                height: 4px;
                border-radius: 50%;
                background: var(--brand-500);
                margin-top: 2px;
            }

            body {
                padding-bottom: 76px;
            }
        }

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

/* roulang page: article */
:root {
            --brand-50: #F2F7FB;
            --brand-100: #E0ECF5;
            --brand-400: #5B9AC2;
            --brand-500: #337EAB;
            --brand-600: #255F83;
            --brand-800: #183A4D;
            --accent-400: #2FA09A;
            --accent-500: #1F7A74;
            --heading: #13293D;
            --body: #33485C;
            --muted: #71879A;
            --border: #E6EEF5;
            --bg-alt: #F6FAFD;
            --shadow-card: 0 8px 30px rgba(19,41,61,0.07);
            --shadow-card-hover: 0 14px 36px rgba(19,41,61,0.12);
            --radius-card: 16px;
            --radius-sm: 10px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'sans-serif';
            background: #FFFFFF;
            color: var(--body);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
            padding-bottom: 64px;
        }

        @media (min-width: 768px) {
            body {
                padding-bottom: 0;
            }
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s ease;
        }

        button,
        input {
            font-family: inherit;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: var(--brand-500);
            color: #FFFFFF;
            font-weight: 600;
            font-size: 15px;
            border-radius: var(--radius-sm);
            padding: 12px 24px;
            transition: all 0.2s ease;
            border: none;
            cursor: pointer;
            white-space: nowrap;
        }

        .btn-primary:hover {
            background: var(--brand-600);
            transform: translateY(-1px);
            box-shadow: 0 8px 20px rgba(51,126,171,0.3);
        }

        .btn-primary:active {
            transform: scale(0.98);
        }

        .btn-primary:focus-visible {
            outline: 3px solid var(--brand-100);
            outline-offset: 2px;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: #FFFFFF;
            color: var(--brand-600);
            font-weight: 600;
            font-size: 15px;
            border-radius: var(--radius-sm);
            padding: 10px 22px;
            border: 1px solid rgba(51,126,171,0.25);
            transition: all 0.2s ease;
            cursor: pointer;
        }

        .btn-secondary:hover {
            background: var(--brand-50);
            border-color: var(--brand-400);
        }

        .btn-secondary:active {
            transform: scale(0.98);
        }

        .btn-secondary:focus-visible {
            outline: 3px solid var(--brand-100);
            outline-offset: 2px;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            background: var(--brand-50);
            color: var(--brand-600);
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            border: 1px solid rgba(51,126,171,0.15);
        }

        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--heading);
            padding: 8px 2px;
            transition: color 0.2s ease;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 2px;
            background: var(--brand-500);
            border-radius: 2px;
            transition: width 0.25s ease;
        }

        .nav-link:hover {
            color: var(--brand-500);
        }

        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }

        .nav-link.active {
            color: var(--brand-500);
            font-weight: 600;
        }

        .footer {
            background: var(--brand-800);
            color: #E0ECF5;
        }

        .footer h4 {
            color: #FFFFFF;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer a {
            color: rgba(255,255,255,0.55);
            font-size: 14px;
            padding: 4px 0;
            transition: color 0.2s ease;
            display: inline-block;
        }

        .footer a:hover {
            color: #FFFFFF;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            margin-top: 40px;
            padding-top: 24px;
            color: rgba(255,255,255,0.4);
            font-size: 13px;
        }

        .mobile-bottom-nav {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 90;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid rgba(19,41,61,0.08);
            display: flex;
            height: 60px;
            padding-bottom: env(safe-area-inset-bottom);
        }

        .mobile-bottom-nav a {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 3px;
            font-size: 11px;
            color: var(--muted);
            transition: color 0.2s ease;
        }

        .mobile-bottom-nav a svg {
            width: 20px;
            height: 20px;
        }

        .mobile-bottom-nav a.active {
            color: var(--brand-500);
            font-weight: 600;
        }

        .mobile-bottom-nav a.active .nav-dot {
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: var(--brand-500);
        }

        @media (min-width: 768px) {
            .mobile-bottom-nav {
                display: none;
            }
        }

        .article-body {
            font-size: 16px;
            line-height: 1.8;
            color: var(--body);
        }

        .article-body h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--heading);
            margin: 2em 0 0.75em;
            padding-bottom: 0.4em;
            border-bottom: 1px solid var(--border);
        }

        .article-body h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--heading);
            margin: 1.75em 0 0.5em;
        }

        .article-body h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--heading);
            margin: 1.5em 0 0.4em;
        }

        .article-body p {
            margin-bottom: 1.5em;
        }

        .article-body img {
            border-radius: 12px;
            margin: 1.5em 0;
            box-shadow: var(--shadow-card);
        }

        .article-body blockquote {
            background: var(--brand-50);
            border-left: 4px solid var(--brand-500);
            padding: 16px 20px;
            border-radius: 0 12px 12px 0;
            margin: 1.5em 0;
            color: var(--body);
        }

        .article-body blockquote p:last-child {
            margin-bottom: 0;
        }

        .article-body ul,
        .article-body ol {
            padding-left: 1.5em;
            margin-bottom: 1.5em;
        }

        .article-body ul li {
            margin-bottom: 0.5em;
        }

        .article-body ol li {
            margin-bottom: 0.5em;
        }

        .article-body a {
            color: var(--brand-500);
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .article-body a:hover {
            color: var(--brand-600);
        }

        .article-body code {
            background: var(--brand-50);
            color: var(--brand-600);
            padding: 2px 6px;
            border-radius: 6px;
            font-size: 0.9em;
        }

        .article-body pre {
            background: var(--brand-800);
            color: #E0ECF5;
            padding: 20px;
            border-radius: 12px;
            overflow-x: auto;
            margin: 1.5em 0;
            font-size: 14px;
            line-height: 1.6;
        }

        .article-body pre code {
            background: transparent;
            color: inherit;
            padding: 0;
        }

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5em 0;
            font-size: 14px;
        }

        .article-body th {
            background: var(--brand-50);
            color: var(--heading);
            font-weight: 600;
            padding: 12px 16px;
            text-align: left;
            border-bottom: 2px solid var(--border);
        }

        .article-body td {
            padding: 10px 16px;
            border-bottom: 1px solid var(--border);
        }

        .related-scroll {
            scrollbar-width: thin;
            scrollbar-color: var(--brand-100) transparent;
        }

        .related-scroll::-webkit-scrollbar {
            height: 6px;
        }

        .related-scroll::-webkit-scrollbar-track {
            background: transparent;
        }

        .related-scroll::-webkit-scrollbar-thumb {
            background-color: var(--brand-100);
            border-radius: 10px;
        }

        .line-clamp-2 {
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .breadcrumb-truncate {
            max-width: 260px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        @media (max-width: 640px) {
            .breadcrumb-truncate {
                max-width: 140px;
            }
        }

/* roulang page: category2 */
:root {
            --brand-50: #F2F7FB;
            --brand-100: #E0ECF5;
            --brand-400: #5B9AC2;
            --brand-500: #337EAB;
            --brand-600: #255F83;
            --brand-800: #183A4D;
            --brand-900: #142F40;
            --accent-400: #2FA09A;
            --accent-500: #1F7A74;
            --text-primary: #13293D;
            --text-body: #33485C;
            --text-muted: #71879A;
            --border-light: rgba(19, 41, 61, 0.08);
            --divider: #E6EEF5;
            --card-shadow: 0 8px 30px rgba(19, 41, 61, 0.07);
            --card-shadow-hover: 0 14px 36px rgba(19, 41, 61, 0.12);
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

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

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Helvetica Neue', Arial, sans-serif;
            color: var(--text-body);
            background: #FFFFFF;
            font-size: 15px;
            line-height: 1.75;
            margin: 0;
            padding: 0 0 64px;
        }

        @media (min-width: 1024px) {
            body {
                padding-bottom: 0;
            }
        }

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

        a {
            color: var(--brand-500);
            text-decoration: none;
            transition: color .2s;
        }

        a:hover {
            color: var(--brand-600);
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(51, 126, 171, .3);
            outline-offset: 2px;
            border-radius: 8px;
        }

        button {
            cursor: pointer;
            font-family: inherit;
        }

        input {
            font-family: inherit;
        }

        ::selection {
            background: var(--brand-100);
            color: var(--brand-800);
        }

        #siteHeader {
            box-shadow: none;
        }

        #siteHeader.scrolled {
            box-shadow: 0 8px 30px rgba(19, 41, 61, .08);
        }

        .nav-link {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-body);
            padding: 6px 2px;
            border-bottom: 2px solid transparent;
            transition: color .2s, border-color .2s;
        }

        .nav-link:hover {
            color: var(--brand-500);
            border-bottom-color: var(--brand-100);
        }

        .nav-link.active {
            color: var(--brand-600);
            border-bottom-color: var(--brand-500);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: var(--brand-500);
            color: #FFFFFF;
            font-size: 14px;
            font-weight: 600;
            padding: 12px 24px;
            border-radius: 10px;
            border: 1px solid transparent;
            transition: all .25s ease;
            box-shadow: 0 4px 14px rgba(51, 126, 171, .2);
            white-space: nowrap;
        }

        .btn-primary:hover {
            background: var(--brand-600);
            color: #FFFFFF;
            transform: translateY(-1px);
            box-shadow: 0 8px 20px rgba(51, 126, 171, .28);
        }

        .btn-primary:active {
            transform: scale(.98);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: transparent;
            border: 1px solid rgba(255, 255, 255, .5);
            color: #FFFFFF;
            font-size: 14px;
            font-weight: 600;
            padding: 12px 24px;
            border-radius: 10px;
            transition: all .25s ease;
            white-space: nowrap;
        }

        .btn-outline:hover {
            background: rgba(255, 255, 255, .12);
            color: #FFFFFF;
            border-color: #FFFFFF;
        }

        .btn-outline:active {
            transform: scale(.98);
        }

        .btn-light {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: #FFFFFF;
            color: var(--brand-600);
            font-size: 14px;
            font-weight: 600;
            padding: 12px 24px;
            border-radius: 10px;
            border: 1px solid var(--brand-100);
            transition: all .25s ease;
            box-shadow: 0 4px 14px rgba(19, 41, 61, .05);
            white-space: nowrap;
        }

        .btn-light:hover {
            background: var(--brand-50);
            color: var(--brand-600);
            transform: translateY(-1px);
            box-shadow: 0 8px 20px rgba(19, 41, 61, .08);
        }

        .btn-light:active {
            transform: scale(.98);
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--brand-500);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 5px 14px;
            border-radius: 999px;
            letter-spacing: .02em;
        }

        .badge-accent {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--accent-500);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            letter-spacing: .02em;
        }

        .cat-banner {
            position: relative;
            min-height: 380px;
            background: var(--brand-50);
            display: flex;
            align-items: center;
            overflow: hidden;
            padding-top: 80px;
        }

        .cat-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(242, 247, 251, .92) 0%, rgba(224, 236, 245, .78) 100%);
            z-index: 1;
        }

        .cat-banner::after {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 420px;
            height: 420px;
            background: radial-gradient(circle, rgba(47, 160, 154, .08) 0%, transparent 70%);
            z-index: 1;
        }

        .cat-banner .banner-inner {
            position: relative;
            z-index: 2;
        }

        .cat-banner .breadcrumb {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }

        .cat-banner .breadcrumb a {
            color: var(--text-muted);
        }

        .cat-banner .breadcrumb a:hover {
            color: var(--brand-500);
        }

        .cat-banner h1 {
            font-size: 36px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            margin: 16px 0 14px;
            line-height: 1.25;
        }

        @media (max-width: 768px) {
            .cat-banner {
                min-height: 340px;
            }
            .cat-banner h1 {
                font-size: 28px;
            }
        }

        .cat-banner .subtitle {
            font-size: 16px;
            color: var(--text-body);
            max-width: 620px;
            line-height: 1.8;
            margin-bottom: 28px;
        }

        .banner-stats {
            display: grid;
            grid-template-columns: repeat(4, auto);
            gap: 20px 36px;
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid var(--divider);
            max-width: 640px;
        }

        @media (max-width: 640px) {
            .banner-stats {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }

        .banner-stats .stat-item .num {
            font-size: 22px;
            font-weight: 800;
            color: var(--brand-600);
            font-variant-numeric: tabular-nums;
            line-height: 1.3;
        }

        .banner-stats .stat-item .label {
            font-size: 12px;
            color: var(--text-muted);
        }

        .section-pad {
            padding: 72px 0;
        }

        @media (max-width: 768px) {
            .section-pad {
                padding: 56px 0;
            }
        }

        .section-head {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 48px;
        }

        .section-head .tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--brand-500);
            background: var(--brand-50);
            border: 1px solid var(--brand-100);
            padding: 4px 14px;
            border-radius: 999px;
            margin-bottom: 14px;
            letter-spacing: .04em;
        }

        .section-head h2 {
            font-size: 30px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.01em;
            margin: 0 0 12px;
            line-height: 1.3;
        }

        @media (max-width: 768px) {
            .section-head h2 {
                font-size: 24px;
            }
        }

        .section-head p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.8;
        }

        .feature-card {
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: 16px;
            padding: 28px 24px;
            box-shadow: var(--card-shadow);
            transition: all .3s ease;
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--card-shadow-hover);
            border-color: var(--brand-100);
        }

        .feature-card .icon {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            background: linear-gradient(135deg, var(--brand-50), var(--brand-100));
            color: var(--brand-500);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
        }

        .feature-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 8px;
        }

        .feature-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin: 0;
        }

        .news-row {
            display: block;
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: 14px;
            padding: 20px 22px;
            margin-bottom: 14px;
            transition: all .25s ease;
        }

        .news-row:hover {
            background: var(--brand-50);
            border-color: var(--brand-100);
            transform: translateX(4px);
            box-shadow: var(--card-shadow);
        }

        .news-row .date-col {
            min-width: 76px;
            border-right: 1px solid var(--divider);
            padding-right: 18px;
            margin-right: 18px;
        }

        .news-row .date-col .day {
            font-size: 18px;
            font-weight: 800;
            color: var(--brand-600);
            line-height: 1.2;
            font-variant-numeric: tabular-nums;
        }

        .news-row .date-col .time {
            font-size: 12px;
            color: var(--text-muted);
        }

        .news-row .tag {
            font-size: 11px;
            font-weight: 600;
            color: var(--accent-500);
            background: rgba(47, 160, 154, .08);
            padding: 3px 10px;
            border-radius: 999px;
            white-space: nowrap;
        }

        .news-row .news-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.5;
        }

        .news-row .news-summary {
            font-size: 13px;
            color: var(--text-muted);
            margin: 4px 0 0;
            line-height: 1.6;
        }

        .news-row .arrow {
            color: var(--brand-400);
            font-size: 18px;
            transition: transform .2s;
            flex-shrink: 0;
        }

        .news-row:hover .arrow {
            transform: translateX(4px);
            color: var(--brand-600);
        }

        .alt-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .alt-block .alt-img {
            border-radius: 18px;
            overflow: hidden;
            box-shadow: var(--card-shadow);
            aspect-ratio: 4/3;
            background: var(--brand-50);
        }

        .alt-block .alt-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .alt-block .alt-content .step {
            font-size: 12px;
            font-weight: 700;
            color: var(--accent-500);
            letter-spacing: .06em;
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        .alt-block .alt-content h3 {
            font-size: 24px;
            font-weight: 800;
            color: var(--text-primary);
            margin: 0 0 14px;
            line-height: 1.35;
        }

        .alt-block .alt-content p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.8;
            margin: 0 0 16px;
        }

        .alt-block .alt-content .check-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .alt-block .alt-content .check-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 14px;
            color: var(--text-body);
            margin-bottom: 10px;
            line-height: 1.6;
        }

        .alt-block .alt-content .check-list li::before {
            content: '';
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--accent-400);
            margin-top: 3px;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: inset 0 0 0 5px rgba(255, 255, 255, .3);
        }

        @media (max-width: 768px) {
            .alt-block {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .alt-block .reverse {
                order: 2;
            }
            .alt-block .alt-img.reverse {
                order: 1;
            }
        }

        .dark-stats {
            background: linear-gradient(130deg, var(--brand-900) 0%, var(--brand-800) 100%);
            border-radius: 24px;
            padding: 56px 48px;
            position: relative;
            overflow: hidden;
        }

        .dark-stats::after {
            content: '';
            position: absolute;
            bottom: -120px;
            right: -80px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(47, 160, 154, .15);
        }

        .dark-stats .stat-box {
            text-align: center;
            padding: 20px 12px;
            position: relative;
            z-index: 1;
        }

        .dark-stats .stat-box .num {
            font-size: 36px;
            font-weight: 800;
            color: #FFFFFF;
            font-variant-numeric: tabular-nums;
            line-height: 1.3;
        }

        .dark-stats .stat-box .label {
            font-size: 13px;
            color: rgba(255, 255, 255, .6);
            margin-top: 4px;
        }

        @media (max-width: 640px) {
            .dark-stats {
                padding: 36px 20px;
            }
            .dark-stats .stat-box .num {
                font-size: 28px;
            }
        }

        .subscribe-panel {
            background: linear-gradient(120deg, var(--brand-50), rgba(224, 236, 245, .6));
            border: 1px solid var(--brand-100);
            border-radius: 24px;
            padding: 48px 40px;
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
        }

        @media (max-width: 768px) {
            .subscribe-panel {
                padding: 32px 20px;
            }
        }

        .subscribe-panel h2 {
            font-size: 26px;
            font-weight: 800;
            color: var(--text-primary);
            margin: 0 0 10px;
        }

        .subscribe-panel .sub-desc {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 24px;
        }

        .subscribe-panel form {
            display: flex;
            gap: 12px;
            max-width: 480px;
            margin: 0 auto;
        }

        @media (max-width: 640px) {
            .subscribe-panel form {
                flex-direction: column;
            }
        }

        .subscribe-panel input[type="email"] {
            flex: 1;
            height: 48px;
            padding: 0 18px;
            border: 1px solid var(--divider);
            border-radius: 10px;
            background: #FFFFFF;
            font-size: 14px;
            color: var(--text-primary);
            transition: border-color .2s, box-shadow .2s;
        }

        .subscribe-panel input[type="email"]:focus {
            border-color: var(--brand-500);
            box-shadow: 0 0 0 4px rgba(51, 126, 171, .12);
            outline: none;
        }

        .subscribe-panel input[type="email"]::placeholder {
            color: #9AB0C2;
        }

        .privacy-note {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 16px;
        }

        .faq-item {
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: 14px;
            margin-bottom: 14px;
            transition: border-color .25s, box-shadow .25s;
            overflow: hidden;
        }

        .faq-item.active {
            border-color: var(--brand-400);
            box-shadow: var(--card-shadow);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            width: 100%;
            padding: 20px 24px;
            background: none;
            border: none;
            text-align: left;
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.5;
            transition: color .2s;
        }

        .faq-question:hover {
            color: var(--brand-500);
        }

        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--brand-50);
            color: var(--brand-500);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 18px;
            font-weight: 400;
            transition: transform .3s, background .2s;
        }

        .faq-item.active .faq-icon {
            transform: rotate(135deg);
            background: var(--brand-500);
            color: #FFFFFF;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .3s ease, padding .3s ease;
            padding: 0 24px;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 22px;
        }

        .faq-answer p {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.75;
            margin: 0;
            border-top: 1px solid var(--divider);
            padding-top: 16px;
        }

        .cta-section {
            background: linear-gradient(120deg, var(--brand-900) 0%, var(--brand-800) 60%, rgba(37, 95, 131, .92) 100%);
            border-radius: 24px;
            padding: 56px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            left: 10%;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            border: 30px solid rgba(47, 160, 154, .1);
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -50px;
            right: 5%;
            width: 160px;
            height: 160px;
            border-radius: 50%;
            background: rgba(47, 160, 154, .08);
        }

        .cta-section h2 {
            font-size: 30px;
            font-weight: 800;
            color: #FFFFFF;
            margin: 0 0 12px;
            position: relative;
            z-index: 1;
        }

        .cta-section p {
            font-size: 15px;
            color: rgba(255, 255, 255, .7);
            margin: 0 auto 28px;
            max-width: 480px;
            position: relative;
            z-index: 1;
        }

        .cta-section .btn-white {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #FFFFFF;
            color: var(--brand-800);
            font-size: 14px;
            font-weight: 700;
            padding: 14px 32px;
            border-radius: 10px;
            transition: all .25s ease;
            position: relative;
            z-index: 1;
            box-shadow: 0 8px 24px rgba(19, 41, 61, .2);
        }

        .cta-section .btn-white:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 30px rgba(19, 41, 61, .28);
            background: var(--brand-50);
        }

        .cta-section .btn-white:active {
            transform: scale(.98);
        }

        @media (max-width: 768px) {
            .cta-section {
                padding: 40px 24px;
            }
            .cta-section h2 {
                font-size: 24px;
            }
        }

        .footer {
            background: var(--brand-900);
            color: rgba(255, 255, 255, .6);
        }

        .footer h4 {
            color: #FFFFFF;
            font-size: 14px;
            font-weight: 600;
            margin: 0 0 18px;
            letter-spacing: .02em;
        }

        .footer a {
            color: rgba(255, 255, 255, .55);
            font-size: 14px;
            line-height: 2.2;
            transition: color .2s;
        }

        .footer a:hover {
            color: #FFFFFF;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .08);
            margin-top: 48px;
            padding-top: 24px;
            font-size: 13px;
            color: rgba(255, 255, 255, .35);
        }

        .mobile-tab-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 60;
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid var(--divider);
            display: flex;
            justify-content: space-around;
            align-items: stretch;
            padding: 6px 4px calc(6px + env(safe-area-inset-bottom));
        }

        .mobile-tab-bar .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 3px;
            font-size: 11px;
            font-weight: 500;
            color: var(--text-muted);
            padding: 6px 12px;
            border-radius: 12px;
            min-width: 64px;
            transition: color .2s, background .2s;
        }

        .mobile-tab-bar .tab-item:hover {
            color: var(--brand-500);
            background: var(--brand-50);
        }

        .mobile-tab-bar .tab-item.active {
            color: var(--brand-600);
            font-weight: 600;
        }

        .mobile-tab-bar .tab-item.active::after {
            content: '';
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: var(--brand-500);
            margin-top: 1px;
        }

        .mobile-tab-bar .tab-item svg {
            width: 20px;
            height: 20px;
        }

        @media (min-width: 1024px) {
            .mobile-tab-bar {
                display: none;
            }
        }

        .row-divider {
            background: var(--divider);
            height: 1px;
            border: none;
            margin: 28px 0;
        }

/* roulang page: category3 */
:root {
        --brand-50: #F2F7FB;
        --brand-100: #E0ECF5;
        --brand-400: #5B9AC2;
        --brand-500: #337EAB;
        --brand-600: #255F83;
        --brand-800: #183A4D;
        --brand-900: #122E3F;
        --accent-400: #2FA09A;
        --accent-500: #1F7A74;
        --text-primary: #13293D;
        --text-body: #33485C;
        --text-muted: #71879A;
        --border-light: rgba(19, 41, 61, 0.08);
        --divider: #E6EEF5;
        --shadow-card: 0 8px 30px rgba(19, 41, 61, 0.07);
        --shadow-card-hover: 0 14px 36px rgba(19, 41, 61, 0.12);
        --radius-card: 16px;
        --radius-btn: 10px;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body { font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif; font-size: 15px; line-height: 1.75; color: var(--text-body); background: #fff; -webkit-font-smoothing: antialiased; }
    a { text-decoration: none; color: var(--brand-500); transition: color .2s; }
    a:hover { color: var(--brand-600); }
    img { max-width: 100%; display: block; }
    button { cursor: pointer; font-family: inherit; }
    .no-scrollbar::-webkit-scrollbar { display: none; }
    .no-scrollbar { -ms-overflow-style: none; scrollbar-width: none; }
    .nav-link { position: relative; font-size: 15px; font-weight: 500; color: var(--text-body); padding: 6px 2px; transition: color .2s; }
    .nav-link:hover { color: var(--brand-500); }
    .nav-link.active { color: var(--brand-500); font-weight: 600; }
    .nav-link.active::after { content: ''; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; border-radius: 2px; background: var(--brand-500); }
    .btn-primary { display: inline-flex; align-items: center; justify-content: center; gap: 6px; background: var(--brand-500); color: #fff; font-size: 15px; font-weight: 600; padding: 12px 24px; border-radius: var(--radius-btn); border: none; transition: all .25s; box-shadow: 0 4px 14px rgba(51, 126, 171, 0.25); }
    .btn-primary:hover { background: var(--brand-600); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(51, 126, 171, 0.35); }
    .btn-primary:active { transform: scale(0.98); }
    .btn-secondary { display: inline-flex; align-items: center; justify-content: center; gap: 6px; background: #fff; color: var(--brand-600); font-size: 15px; font-weight: 600; padding: 12px 24px; border-radius: var(--radius-btn); border: 1px solid rgba(51, 126, 171, 0.25); transition: all .25s; }
    .btn-secondary:hover { background: var(--brand-50); color: var(--brand-600); border-color: var(--brand-400); }
    .mobile-tab-bar { display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 100; background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(12px); border-top: 1px solid var(--divider); padding: 6px 12px; padding-bottom: calc(6px + env(safe-area-inset-bottom)); }
    .tab-item { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; padding: 6px 4px; border-radius: 12px; color: var(--text-muted); font-size: 11px; font-weight: 500; transition: all .2s; }
    .tab-item svg { width: 20px; height: 20px; }
    .tab-item.active { color: var(--brand-500); }
    .tab-item.active span { font-weight: 600; }
    .tab-item.active::after { content: ''; width: 4px; height: 4px; border-radius: 50%; background: var(--brand-500); margin-top: 2px; }
    @media (max-width: 1023px) { .mobile-tab-bar { display: flex; justify-content: space-around; } body { padding-bottom: 70px; } }
    .faq-item { border: 1px solid var(--border-light); border-radius: 16px; background: #fff; transition: all .25s; }
    .faq-item:hover { box-shadow: var(--shadow-card); }
    .faq-item.active { border-color: var(--brand-400); box-shadow: var(--shadow-card); }
    .faq-question { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; cursor: pointer; }
    .faq-question h3 { font-size: 16px; font-weight: 600; color: var(--text-primary); }
    .faq-icon { width: 28px; height: 28px; border-radius: 50%; background: var(--brand-50); display: flex; align-items: center; justify-content: center; color: var(--brand-500); transition: all .3s; flex-shrink: 0; }
    .faq-icon svg { width: 14px; height: 14px; }
    .faq-item.active .faq-icon { transform: rotate(45deg); background: var(--brand-500); color: #fff; }
    .faq-answer { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
    .faq-item.active .faq-answer { max-height: 300px; }
    .faq-answer p { padding: 0 24px 20px; font-size: 14px; color: var(--text-body); line-height: 1.8; }
    .service-card { border: 1px solid var(--border-light); border-radius: 16px; background: #fff; padding: 28px 24px; transition: all .3s; }
    .service-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-4px); border-color: var(--brand-100); }
    .service-card .icon-wrap { width: 48px; height: 48px; border-radius: 12px; background: var(--brand-50); display: flex; align-items: center; justify-content: center; color: var(--brand-500); margin-bottom: 18px; transition: all .3s; }
    .service-card:hover .icon-wrap { background: var(--brand-500); color: #fff; }
    .step-node { position: relative; }
    .step-node::before { content: ''; position: absolute; top: 40px; left: 24px; width: calc(100% - 48px); height: 1px; background: var(--divider); }
    @media (max-width: 767px) { .step-node::before { display: none; } }
    .step-circle { width: 48px; height: 48px; border-radius: 50%; background: var(--brand-500); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 18px; margin: 0 auto 16px; position: relative; z-index: 1; box-shadow: 0 4px 14px rgba(51, 126, 171, 0.3); }
    .device-card { border: 1px solid var(--border-light); border-radius: 16px; background: #fff; padding: 24px; text-align: center; transition: all .3s; }
    .device-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-4px); }
    .footer h4 { color: #fff; font-size: 15px; font-weight: 600; margin-bottom: 16px; }
    .footer a { color: rgba(255, 255, 255, 0.55); font-size: 14px; display: block; margin-bottom: 10px; transition: color .2s; }
    .footer a:hover { color: #fff; }
    .footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.08); margin-top: 48px; padding-top: 24px; }
    .footer-bottom p { color: rgba(255, 255, 255, 0.4); font-size: 13px; }
    .badge { display: inline-flex; align-items: center; gap: 6px; background: rgba(255, 255, 255, 0.15); border: 1px solid rgba(255, 255, 255, 0.25); color: #fff; font-size: 12px; font-weight: 500; padding: 4px 12px; border-radius: 999px; backdrop-filter: blur(4px); }
    .breadcrumb a { color: rgba(255, 255, 255, 0.65); font-size: 13px; }
    .breadcrumb a:hover { color: #fff; }
    .breadcrumb span { color: rgba(255, 255, 255, 0.4); font-size: 13px; }