/* roulang page: index */
/* ===== Design Variables ===== */
    :root {
        --primary: #0f2b4a;
        --primary-light: #1a3f64;
        --primary-dark: #0a1e33;
        --accent: #e87a2f;
        --accent-light: #f0944a;
        --accent-dark: #c9621e;
        --bg-body: #f7f9fc;
        --bg-card: #ffffff;
        --bg-dark: #0f2b4a;
        --bg-light: #edf2f8;
        --text-primary: #1a2332;
        --text-secondary: #4a5568;
        --text-light: #8a94a6;
        --text-white: #ffffff;
        --text-accent: #e87a2f;
        --border: #e2e8f0;
        --border-light: #f0f3f7;
        --radius: 14px;
        --radius-sm: 8px;
        --radius-lg: 20px;
        --shadow: 0 4px 24px rgba(15, 43, 74, 0.08);
        --shadow-hover: 0 12px 40px rgba(15, 43, 74, 0.15);
        --shadow-hero: 0 8px 40px rgba(0, 0, 0, 0.25);
        --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
        --container: 1200px;
        --header-h: 76px;
        --spacer: 80px;
        --spacer-sm: 48px;
    }

    /* ===== Reset & Base ===== */
    *,
    *::before,
    *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }

    html {
        scroll-behavior: smooth;
        -webkit-text-size-adjust: 100%;
    }

    body {
        font-family: var(--font);
        font-size: 16px;
        line-height: 1.7;
        color: var(--text-primary);
        background: var(--bg-body);
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }

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

    a:hover {
        color: var(--accent);
    }

    img {
        max-width: 100%;
        height: auto;
        display: block;
        border-radius: var(--radius-sm);
    }

    ul,
    ol {
        list-style: none;
    }

    button,
    input,
    textarea,
    select {
        font-family: inherit;
        font-size: inherit;
        outline: none;
        border: none;
        background: none;
    }

    button {
        cursor: pointer;
    }

    /* ===== Container ===== */
    .container {
        max-width: var(--container);
        margin: 0 auto;
        padding: 0 24px;
    }

    @media (max-width: 768px) {
        .container {
            padding: 0 16px;
        }
        :root {
            --spacer: 48px;
            --spacer-sm: 32px;
            --header-h: 64px;
        }
    }

    /* ===== Typography ===== */
    h1,
    h2,
    h3,
    h4,
    h5,
    h6 {
        font-weight: 700;
        line-height: 1.25;
        color: var(--text-primary);
    }

    h1 {
        font-size: clamp(2.2rem, 5vw, 3.6rem);
        letter-spacing: -0.02em;
    }
    h2 {
        font-size: clamp(1.6rem, 3.5vw, 2.4rem);
        letter-spacing: -0.01em;
    }
    h3 {
        font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    }
    h4 {
        font-size: 1.15rem;
    }

    .section-title {
        text-align: center;
        margin-bottom: 16px;
    }

    .section-sub {
        text-align: center;
        color: var(--text-secondary);
        max-width: 640px;
        margin: 0 auto 48px auto;
        font-size: 1.05rem;
    }

    @media (max-width: 768px) {
        .section-sub {
            margin-bottom: 32px;
            font-size: 0.95rem;
        }
    }

    /* ===== Buttons ===== */
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        padding: 14px 34px;
        border-radius: 50px;
        font-weight: 600;
        font-size: 1rem;
        transition: var(--transition);
        border: 2px solid transparent;
        letter-spacing: 0.3px;
    }

    .btn-primary {
        background: var(--accent);
        color: var(--text-white);
        border-color: var(--accent);
    }

    .btn-primary:hover {
        background: var(--accent-dark);
        border-color: var(--accent-dark);
        transform: translateY(-2px);
        box-shadow: 0 8px 28px rgba(232, 122, 47, 0.35);
        color: var(--text-white);
    }

    .btn-outline {
        background: transparent;
        color: var(--text-white);
        border-color: rgba(255, 255, 255, 0.6);
    }

    .btn-outline:hover {
        background: var(--text-white);
        color: var(--primary);
        border-color: var(--text-white);
        transform: translateY(-2px);
    }

    .btn-ghost {
        background: transparent;
        color: var(--primary);
        border-color: var(--border);
    }

    .btn-ghost:hover {
        background: var(--bg-light);
        border-color: var(--primary);
        transform: translateY(-2px);
    }

    .btn-sm {
        padding: 8px 20px;
        font-size: 0.88rem;
    }

    .btn-lg {
        padding: 18px 44px;
        font-size: 1.1rem;
    }

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

    @media (max-width: 520px) {
        .btn {
            padding: 12px 24px;
            font-size: 0.92rem;
        }
        .btn-lg {
            padding: 14px 30px;
            font-size: 1rem;
        }
    }

    /* ===== Badge / Tag ===== */
    .badge {
        display: inline-block;
        padding: 4px 16px;
        border-radius: 50px;
        font-size: 0.78rem;
        font-weight: 600;
        letter-spacing: 0.3px;
        background: var(--bg-light);
        color: var(--primary-light);
    }

    .badge-accent {
        background: rgba(232, 122, 47, 0.12);
        color: var(--accent);
    }

    .badge-white {
        background: rgba(255, 255, 255, 0.2);
        color: var(--text-white);
    }

    .tag {
        display: inline-block;
        padding: 2px 12px;
        border-radius: 4px;
        font-size: 0.75rem;
        font-weight: 500;
        background: var(--bg-light);
        color: var(--text-secondary);
        transition: var(--transition);
    }

    .tag:hover {
        background: var(--accent);
        color: var(--text-white);
    }

    /* ===== Header & Navigation ===== */
    .header {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: var(--header-h);
        background: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--border-light);
        z-index: 1000;
        transition: var(--transition);
    }

    .header.scrolled {
        box-shadow: 0 2px 20px rgba(15, 43, 74, 0.08);
    }

    .header-inner {
        display: flex;
        align-items: center;
        justify-content: center;
        height: var(--header-h);
        max-width: var(--container);
        margin: 0 auto;
        padding: 0 24px;
        position: relative;
    }

    /* Logo 居中 */
    .logo {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        font-size: 1.35rem;
        font-weight: 800;
        color: var(--primary);
        letter-spacing: -0.3px;
        white-space: nowrap;
        transition: var(--transition);
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .logo:hover {
        color: var(--accent);
    }

    .logo-icon {
        width: 36px;
        height: 36px;
        background: var(--accent);
        border-radius: 8px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
        font-size: 1.1rem;
        flex-shrink: 0;
    }

    /* 左侧导航 */
    .nav-left,
    .nav-right {
        display: flex;
        align-items: center;
        gap: 8px;
    }

    .nav-left {
        margin-right: auto;
    }

    .nav-right {
        margin-left: auto;
    }

    .nav-link {
        padding: 6px 16px;
        border-radius: 8px;
        font-size: 0.92rem;
        font-weight: 500;
        color: var(--text-secondary);
        transition: var(--transition);
        position: relative;
    }

    .nav-link:hover {
        color: var(--primary);
        background: var(--bg-light);
    }

    .nav-link.active {
        color: var(--primary);
        background: var(--bg-light);
        font-weight: 600;
    }

    .nav-link.active::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 20px;
        height: 3px;
        background: var(--accent);
        border-radius: 4px;
    }

    /* 移动端菜单按钮 */
    .menu-toggle {
        display: none;
        font-size: 1.5rem;
        color: var(--primary);
        padding: 4px 8px;
        border-radius: 8px;
        background: none;
        border: none;
        transition: var(--transition);
        z-index: 1001;
    }

    .menu-toggle:hover {
        background: var(--bg-light);
    }

    /* 移动端导航抽屉 */
    @media (max-width: 820px) {
        .header-inner {
            justify-content: space-between;
            padding: 0 16px;
        }

        .logo {
            position: static;
            transform: none;
            font-size: 1.15rem;
        }

        .logo-icon {
            width: 30px;
            height: 30px;
            font-size: 0.95rem;
        }

        .nav-left,
        .nav-right {
            display: none;
        }

        .menu-toggle {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .mobile-nav-open .nav-left,
        .mobile-nav-open .nav-right {
            display: flex;
            flex-direction: column;
            align-items: stretch;
            gap: 4px;
            position: fixed;
            top: var(--header-h);
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            padding: 16px 24px 24px;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
            border-bottom: 1px solid var(--border-light);
            z-index: 999;
        }

        .mobile-nav-open .nav-right {
            top: calc(var(--header-h) + 160px);
        }

        .mobile-nav-open .nav-link {
            padding: 12px 16px;
            font-size: 1rem;
            border-radius: 10px;
        }

        .mobile-nav-open .nav-link.active::after {
            display: none;
        }

        .mobile-nav-open .nav-link.active {
            background: var(--bg-light);
            border-left: 4px solid var(--accent);
        }
    }

    /* ===== Hero Section ===== */
    .hero {
        padding-top: var(--header-h);
        min-height: 100vh;
        display: flex;
        align-items: center;
        position: relative;
        background: var(--primary-dark);
        background-image: url('/assets/images/backpic/back-1.png');
        background-size: cover;
        background-position: center;
        background-repeat: no-repeat;
        overflow: hidden;
    }

    .hero::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(15, 43, 74, 0.85) 0%, rgba(10, 30, 51, 0.7) 60%, rgba(15, 43, 74, 0.5) 100%);
        z-index: 1;
    }

    .hero::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 120px;
        background: linear-gradient(to top, var(--bg-body), transparent);
        z-index: 2;
    }

    .hero-content {
        position: relative;
        z-index: 3;
        max-width: 820px;
        margin: 0 auto;
        text-align: center;
        padding: 60px 24px 80px;
    }

    .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        background: rgba(255, 255, 255, 0.12);
        backdrop-filter: blur(6px);
        padding: 6px 20px 6px 16px;
        border-radius: 50px;
        color: var(--text-white);
        font-size: 0.85rem;
        font-weight: 500;
        margin-bottom: 24px;
        border: 1px solid rgba(255, 255, 255, 0.15);
    }

    .hero-badge i {
        color: var(--accent);
    }

    .hero h1 {
        color: var(--text-white);
        font-weight: 800;
        margin-bottom: 20px;
        text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
    }

    .hero h1 .highlight {
        color: var(--accent);
    }

    .hero p {
        font-size: 1.15rem;
        color: rgba(255, 255, 255, 0.85);
        max-width: 620px;
        margin: 0 auto 36px;
        line-height: 1.8;
        text-shadow: 0 1px 8px rgba(0, 0, 0, 0.15);
    }

    .hero-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 16px;
        justify-content: center;
    }

    .hero-stats {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 40px;
        margin-top: 48px;
        padding-top: 36px;
        border-top: 1px solid rgba(255, 255, 255, 0.12);
    }

    .hero-stat {
        text-align: center;
    }

    .hero-stat-number {
        font-size: 2rem;
        font-weight: 800;
        color: var(--text-white);
        letter-spacing: -0.5px;
    }

    .hero-stat-number .accent {
        color: var(--accent);
    }

    .hero-stat-label {
        font-size: 0.85rem;
        color: rgba(255, 255, 255, 0.65);
        margin-top: 4px;
    }

    @media (max-width: 768px) {
        .hero {
            min-height: 92vh;
        }
        .hero-content {
            padding: 40px 16px 60px;
        }
        .hero p {
            font-size: 1rem;
        }
        .hero-stats {
            gap: 24px;
        }
        .hero-stat-number {
            font-size: 1.6rem;
        }
    }

    @media (max-width: 520px) {
        .hero-stats {
            flex-direction: column;
            gap: 16px;
        }
        .hero-actions {
            flex-direction: column;
            align-items: center;
        }
        .hero-actions .btn {
            width: 100%;
            max-width: 280px;
        }
    }

    /* ===== Section Spacing ===== */
    section {
        padding: var(--spacer) 0;
    }

    .section-dark {
        background: var(--bg-dark);
        color: var(--text-white);
    }

    .section-dark .section-title {
        color: var(--text-white);
    }

    .section-dark .section-sub {
        color: rgba(255, 255, 255, 0.7);
    }

    .section-light {
        background: var(--bg-light);
    }

    /* ===== Card Base ===== */
    .card {
        background: var(--bg-card);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        transition: var(--transition);
        overflow: hidden;
    }

    .card:hover {
        box-shadow: var(--shadow-hover);
        transform: translateY(-4px);
    }

    .card-image {
        width: 100%;
        aspect-ratio: 16 / 10;
        object-fit: cover;
        border-radius: var(--radius) var(--radius) 0 0;
        display: block;
    }

    .card-body {
        padding: 22px 24px 26px;
    }

    .card-title {
        font-size: 1.1rem;
        font-weight: 700;
        margin-bottom: 8px;
        color: var(--text-primary);
        transition: var(--transition);
    }

    .card:hover .card-title {
        color: var(--accent);
    }

    .card-text {
        color: var(--text-secondary);
        font-size: 0.92rem;
        line-height: 1.7;
    }

    .card-meta {
        display: flex;
        align-items: center;
        gap: 12px;
        font-size: 0.82rem;
        color: var(--text-light);
        margin-top: 12px;
    }

    .card-meta i {
        margin-right: 4px;
    }

    /* ===== Grid ===== */
    .grid-2 {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 28px;
    }

    .grid-3 {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
    }

    .grid-4 {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
    }

    @media (max-width: 1024px) {
        .grid-4 {
            grid-template-columns: repeat(2, 1fr);
        }
    }

    @media (max-width: 768px) {
        .grid-2,
        .grid-3,
        .grid-4 {
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
    }

    @media (max-width: 520px) {
        .grid-2,
        .grid-3,
        .grid-4 {
            grid-template-columns: 1fr;
            gap: 18px;
        }
    }

    /* ===== Intro / Features ===== */
    .features-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 32px;
    }

    .feature-card {
        text-align: center;
        padding: 36px 28px;
        background: var(--bg-card);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        transition: var(--transition);
        border: 1px solid var(--border-light);
    }

    .feature-card:hover {
        box-shadow: var(--shadow-hover);
        transform: translateY(-6px);
        border-color: var(--accent);
    }

    .feature-icon {
        width: 64px;
        height: 64px;
        border-radius: 16px;
        background: var(--bg-light);
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 18px;
        font-size: 1.6rem;
        color: var(--accent);
        transition: var(--transition);
    }

    .feature-card:hover .feature-icon {
        background: var(--accent);
        color: var(--text-white);
    }

    .feature-card h3 {
        margin-bottom: 8px;
        font-size: 1.15rem;
    }

    .feature-card p {
        color: var(--text-secondary);
        font-size: 0.92rem;
        line-height: 1.7;
    }

    @media (max-width: 768px) {
        .features-grid {
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .feature-card {
            padding: 28px 20px;
        }
    }

    @media (max-width: 520px) {
        .features-grid {
            grid-template-columns: 1fr;
        }
    }

    /* ===== Category Cards ===== */
    .category-card {
        position: relative;
        border-radius: var(--radius);
        overflow: hidden;
        box-shadow: var(--shadow);
        transition: var(--transition);
        background: var(--bg-card);
        cursor: pointer;
    }

    .category-card:hover {
        box-shadow: var(--shadow-hover);
        transform: translateY(-4px);
    }

    .category-card img {
        width: 100%;
        aspect-ratio: 4 / 3;
        object-fit: cover;
        border-radius: 0;
        transition: var(--transition);
    }

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

    .category-overlay {
        position: absolute;
        inset: 0;
        background: linear-gradient(to top, rgba(15, 43, 74, 0.7) 0%, transparent 60%);
        display: flex;
        flex-direction: column;
        justify-content: flex-end;
        padding: 24px;
        transition: var(--transition);
    }

    .category-overlay h3 {
        color: var(--text-white);
        font-size: 1.2rem;
        font-weight: 700;
        margin-bottom: 4px;
    }

    .category-overlay p {
        color: rgba(255, 255, 255, 0.8);
        font-size: 0.88rem;
    }

    /* ===== Content List (CMS) ===== */
    .content-list {
        display: grid;
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .content-item {
        display: flex;
        gap: 20px;
        padding: 20px 24px;
        background: var(--bg-card);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        transition: var(--transition);
        border: 1px solid var(--border-light);
        align-items: flex-start;
    }

    .content-item:hover {
        box-shadow: var(--shadow-hover);
        transform: translateY(-2px);
        border-color: var(--accent);
    }

    .content-item .item-thumb {
        width: 160px;
        min-height: 100px;
        border-radius: var(--radius-sm);
        object-fit: cover;
        flex-shrink: 0;
        background: var(--bg-light);
    }

    .content-item .item-body {
        flex: 1;
        min-width: 0;
    }

    .content-item .item-category {
        display: inline-block;
        font-size: 0.75rem;
        font-weight: 600;
        color: var(--accent);
        background: rgba(232, 122, 47, 0.1);
        padding: 2px 12px;
        border-radius: 4px;
        margin-bottom: 6px;
    }

    .content-item .item-title {
        font-size: 1.05rem;
        font-weight: 700;
        color: var(--text-primary);
        margin-bottom: 6px;
        transition: var(--transition);
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .content-item:hover .item-title {
        color: var(--accent);
    }

    .content-item .item-excerpt {
        color: var(--text-secondary);
        font-size: 0.9rem;
        line-height: 1.7;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .content-item .item-meta {
        display: flex;
        align-items: center;
        gap: 16px;
        margin-top: 10px;
        font-size: 0.82rem;
        color: var(--text-light);
    }

    .content-item .item-meta i {
        margin-right: 4px;
    }

    @media (max-width: 768px) {
        .content-item {
            flex-direction: column;
            padding: 16px;
        }
        .content-item .item-thumb {
            width: 100%;
            height: 180px;
        }
    }

    @media (max-width: 520px) {
        .content-item .item-thumb {
            height: 140px;
        }
    }

    /* ===== Process / Steps ===== */
    .steps-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
        counter-reset: step;
    }

    .step-card {
        text-align: center;
        padding: 32px 20px;
        background: var(--bg-card);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        transition: var(--transition);
        position: relative;
        border: 1px solid var(--border-light);
    }

    .step-card:hover {
        box-shadow: var(--shadow-hover);
        transform: translateY(-4px);
    }

    .step-number {
        width: 48px;
        height: 48px;
        border-radius: 50%;
        background: var(--primary);
        color: var(--text-white);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.2rem;
        font-weight: 800;
        margin: 0 auto 16px;
        transition: var(--transition);
    }

    .step-card:hover .step-number {
        background: var(--accent);
        transform: scale(1.08);
    }

    .step-card h4 {
        font-size: 1rem;
        margin-bottom: 6px;
    }

    .step-card p {
        color: var(--text-secondary);
        font-size: 0.88rem;
        line-height: 1.6;
    }

    @media (max-width: 1024px) {
        .steps-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }

    @media (max-width: 520px) {
        .steps-grid {
            grid-template-columns: 1fr;
        }
    }

    /* ===== FAQ ===== */
    .faq-list {
        max-width: 800px;
        margin: 0 auto;
        display: grid;
        gap: 12px;
    }

    .faq-item {
        background: var(--bg-card);
        border-radius: var(--radius-sm);
        border: 1px solid var(--border-light);
        overflow: hidden;
        transition: var(--transition);
    }

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

    .faq-question {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 18px 22px;
        font-size: 1rem;
        font-weight: 600;
        color: var(--text-primary);
        background: none;
        border: none;
        text-align: left;
        cursor: pointer;
        transition: var(--transition);
        gap: 16px;
    }

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

    .faq-question i {
        font-size: 0.85rem;
        color: var(--text-light);
        transition: var(--transition);
        flex-shrink: 0;
    }

    .faq-item.active .faq-question i {
        transform: rotate(180deg);
        color: var(--accent);
    }

    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease, padding 0.3s ease;
        padding: 0 22px;
        color: var(--text-secondary);
        font-size: 0.92rem;
        line-height: 1.7;
    }

    .faq-item.active .faq-answer {
        max-height: 300px;
        padding: 0 22px 20px;
    }

    /* ===== CTA ===== */
    .cta-section {
        background: var(--primary-dark);
        background-image: url('/assets/images/backpic/back-2.png');
        background-size: cover;
        background-position: center;
        position: relative;
        padding: 80px 0;
    }

    .cta-section::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(15, 43, 74, 0.88) 0%, rgba(10, 30, 51, 0.8) 100%);
        z-index: 1;
    }

    .cta-content {
        position: relative;
        z-index: 2;
        text-align: center;
        max-width: 680px;
        margin: 0 auto;
        padding: 0 24px;
    }

    .cta-content h2 {
        color: var(--text-white);
        font-size: clamp(1.6rem, 3vw, 2.4rem);
        margin-bottom: 16px;
    }

    .cta-content p {
        color: rgba(255, 255, 255, 0.8);
        font-size: 1.05rem;
        margin-bottom: 32px;
        line-height: 1.8;
    }

    .cta-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 16px;
        justify-content: center;
    }

    /* ===== Footer ===== */
    .footer {
        background: var(--bg-dark);
        color: rgba(255, 255, 255, 0.7);
        padding: 48px 0 32px;
    }

    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 40px;
        margin-bottom: 36px;
    }

    .footer-brand .logo {
        position: static;
        transform: none;
        justify-content: flex-start;
        font-size: 1.2rem;
        color: var(--text-white);
        margin-bottom: 12px;
    }

    .footer-brand .logo .logo-icon {
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
    }

    .footer-brand p {
        font-size: 0.9rem;
        line-height: 1.8;
        max-width: 320px;
        color: rgba(255, 255, 255, 0.6);
    }

    .footer-col h4 {
        color: var(--text-white);
        font-size: 0.95rem;
        font-weight: 700;
        margin-bottom: 16px;
    }

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

    .footer-col ul li a {
        color: rgba(255, 255, 255, 0.6);
        font-size: 0.88rem;
        transition: var(--transition);
    }

    .footer-col ul li a:hover {
        color: var(--accent);
        padding-left: 4px;
    }

    .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, 0.08);
        padding-top: 24px;
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: center;
        gap: 12px;
        font-size: 0.82rem;
        color: rgba(255, 255, 255, 0.45);
    }

    .footer-bottom a {
        color: rgba(255, 255, 255, 0.5);
    }

    .footer-bottom a:hover {
        color: var(--accent);
    }

    .footer-social {
        display: flex;
        gap: 12px;
    }

    .footer-social a {
        width: 36px;
        height: 36px;
        border-radius: 50%;
        background: rgba(255, 255, 255, 0.06);
        display: flex;
        align-items: center;
        justify-content: center;
        color: rgba(255, 255, 255, 0.5);
        font-size: 0.95rem;
        transition: var(--transition);
    }

    .footer-social a:hover {
        background: var(--accent);
        color: var(--text-white);
        transform: translateY(-2px);
    }

    @media (max-width: 1024px) {
        .footer-grid {
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
    }

    @media (max-width: 768px) {
        .footer-grid {
            grid-template-columns: 1fr;
            gap: 28px;
        }
        .footer-bottom {
            flex-direction: column;
            text-align: center;
        }
    }

    /* ===== Empty State ===== */
    .empty-state {
        text-align: center;
        padding: 48px 24px;
        color: var(--text-light);
    }

    .empty-state i {
        font-size: 2.4rem;
        margin-bottom: 16px;
        color: var(--border);
    }

    .empty-state p {
        font-size: 1rem;
    }

    /* ===== Misc ===== */
    .text-center {
        text-align: center;
    }

    .mt-16 {
        margin-top: 16px;
    }
    .mt-24 {
        margin-top: 24px;
    }
    .mt-32 {
        margin-top: 32px;
    }
    .mb-16 {
        margin-bottom: 16px;
    }
    .mb-24 {
        margin-bottom: 24px;
    }
    .mb-32 {
        margin-bottom: 32px;
    }

    .divider {
        width: 60px;
        height: 4px;
        background: var(--accent);
        border-radius: 4px;
        margin: 0 auto 20px;
    }

    .divider-left {
        margin: 0 0 20px 0;
    }

    /* ===== Scrollbar ===== */
    ::-webkit-scrollbar {
        width: 8px;
        height: 8px;
    }

    ::-webkit-scrollbar-track {
        background: var(--bg-light);
    }

    ::-webkit-scrollbar-thumb {
        background: var(--text-light);
        border-radius: 8px;
    }

    ::-webkit-scrollbar-thumb:hover {
        background: var(--text-secondary);
    }

    /* ===== Focus visible ===== */
    :focus-visible {
        outline: 3px solid var(--accent);
        outline-offset: 2px;
    }

    /* ===== Skip link ===== */
    .skip-link {
        position: absolute;
        top: -100%;
        left: 16px;
        background: var(--accent);
        color: var(--text-white);
        padding: 12px 24px;
        border-radius: 8px;
        z-index: 9999;
        font-weight: 600;
    }

    .skip-link:focus {
        top: 16px;
    }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a56db;
            --primary-dark: #1341a8;
            --primary-light: #3b7bf0;
            --primary-bg: #eef2ff;
            --secondary: #f59e0b;
            --secondary-dark: #d97706;
            --secondary-light: #fcd34d;
            --accent: #06b6d4;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --radius-sm: 6px;
            --radius: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --max-width: 1200px;
            --content-width: 820px;
            --header-h: 72px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 2px; }
        ul, ol { list-style: none; }
        button { cursor: pointer; font-family: inherit; font-size: inherit; border: none; background: none; }
        input, textarea { font-family: inherit; font-size: inherit; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; color: var(--text); font-weight: 700; }
        h1 { font-size: 2.25rem; }
        h2 { font-size: 1.75rem; }
        h3 { font-size: 1.35rem; }
        h4 { font-size: 1.1rem; }
        p { margin-bottom: 1rem; color: var(--text-light); }
        p:last-child { margin-bottom: 0; }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-h);
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }
        .header.scrolled { box-shadow: var(--shadow); }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .header-left, .header-right {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
        }
        .header-right { justify-content: flex-end; }
        .header-center {
            flex: 0 0 auto;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.3px;
            transition: opacity var(--transition);
        }
        .logo:hover { color: var(--text); opacity: 0.85; }
        .logo-icon {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: white;
            border-radius: var(--radius-sm);
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 6px 16px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-light);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            position: relative;
        }
        .nav-link:hover {
            color: var(--primary);
            background: var(--primary-bg);
        }
        .nav-link.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
        }
        .nav-right-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 22px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            border-radius: var(--radius);
            font-size: 0.9rem;
            font-weight: 600;
            transition: all var(--transition);
            box-shadow: 0 4px 12px rgba(26,86,219,0.25);
        }
        .nav-right-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(26,86,219,0.35);
            color: #fff;
        }
        .mobile-toggle {
            display: none;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--text);
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .mobile-toggle:hover { background: var(--border-light); }

        /* ===== Hero / Article Banner ===== */
        .article-hero {
            padding-top: calc(var(--header-h) + 40px);
            padding-bottom: 60px;
            background: linear-gradient(135deg, var(--bg-dark) 0%, #1e293b 100%);
            position: relative;
            overflow: hidden;
            min-height: 340px;
            display: flex;
            align-items: center;
        }
        .article-hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            z-index: 0;
        }
        .article-hero .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .article-hero .breadcrumb {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.6);
            margin-bottom: 20px;
        }
        .article-hero .breadcrumb a {
            color: rgba(255,255,255,0.7);
            transition: color var(--transition);
        }
        .article-hero .breadcrumb a:hover { color: #fff; }
        .article-hero .breadcrumb i { font-size: 0.65rem; color: rgba(255,255,255,0.4); }
        .article-hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 16px;
            background: rgba(255,255,255,0.12);
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255,255,255,0.15);
            border-radius: 50px;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.9);
            margin-bottom: 16px;
        }
        .article-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: #fff;
            max-width: 800px;
            margin: 0 auto 16px;
            letter-spacing: -0.5px;
            line-height: 1.25;
        }
        .article-hero .hero-meta {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.7);
        }
        .article-hero .hero-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-hero .hero-meta i { font-size: 0.85rem; }
        .article-hero .hero-meta .category-tag {
            display: inline-flex;
            align-items: center;
            padding: 2px 14px;
            background: var(--secondary);
            color: #1e293b;
            border-radius: 50px;
            font-size: 0.78rem;
            font-weight: 600;
        }

        /* ===== Article Content ===== */
        .article-section {
            padding: 50px 0 30px;
        }
        .article-content-wrap {
            max-width: var(--content-width);
            margin: 0 auto;
        }
        .article-body {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            padding: 48px 52px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }
        .article-body .content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }
        .article-body .content p {
            margin-bottom: 1.4rem;
            color: var(--text);
        }
        .article-body .content h2,
        .article-body .content h3,
        .article-body .content h4 {
            margin-top: 2rem;
            margin-bottom: 0.8rem;
        }
        .article-body .content img {
            border-radius: var(--radius);
            margin: 1.8rem 0;
            box-shadow: var(--shadow-sm);
        }
        .article-body .content ul,
        .article-body .content ol {
            margin-bottom: 1.4rem;
            padding-left: 1.6rem;
            color: var(--text);
        }
        .article-body .content ul { list-style: disc; }
        .article-body .content ol { list-style: decimal; }
        .article-body .content li { margin-bottom: 0.4rem; }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-bg);
            padding: 16px 22px;
            margin: 1.6rem 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text);
            font-style: normal;
        }
        .article-body .content a { color: var(--primary); font-weight: 500; text-decoration: underline; text-underline-offset: 2px; }
        .article-body .content a:hover { color: var(--primary-dark); }
        .article-footer-info {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            margin-top: 36px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
        }
        .article-footer-info .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.85rem;
            color: var(--text-light);
        }
        .article-footer-info .meta-item i { font-size: 0.8rem; }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 20px;
        }
        .article-tags .tag {
            display: inline-flex;
            padding: 4px 14px;
            background: var(--primary-bg);
            color: var(--primary);
            border-radius: 50px;
            font-size: 0.78rem;
            font-weight: 500;
            transition: all var(--transition);
        }
        .article-tags .tag:hover { background: var(--primary); color: #fff; transform: translateY(-1px); }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 20px;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }
        .not-found-box .nf-icon {
            font-size: 3.6rem;
            color: var(--border);
            margin-bottom: 20px;
        }
        .not-found-box h2 {
            font-size: 1.6rem;
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--text-light);
            margin-bottom: 28px;
            font-size: 1.05rem;
        }
        .not-found-box .btn-home {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 32px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius);
            font-weight: 600;
            transition: all var(--transition);
            box-shadow: 0 4px 12px rgba(26,86,219,0.2);
        }
        .not-found-box .btn-home:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(26,86,219,0.3); color: #fff; }

        /* ===== Related Articles ===== */
        .related-section {
            padding: 40px 0 60px;
        }
        .related-section .section-title {
            text-align: center;
            margin-bottom: 36px;
        }
        .related-section .section-title h2 {
            font-size: 1.6rem;
            font-weight: 700;
        }
        .related-section .section-title p {
            color: var(--text-light);
            font-size: 0.95rem;
            margin-top: 6px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .related-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
            border-color: var(--primary-light);
        }
        .related-card .rc-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
            background: var(--border-light);
        }
        .related-card .rc-body {
            padding: 18px 18px 20px;
        }
        .related-card .rc-cat {
            display: inline-block;
            padding: 2px 12px;
            background: var(--primary-bg);
            color: var(--primary);
            border-radius: 50px;
            font-size: 0.7rem;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .related-card .rc-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            line-height: 1.4;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .rc-title:hover { color: var(--primary); }
        .related-card .rc-date {
            font-size: 0.78rem;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 4px;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 60px 0 70px;
            background: linear-gradient(135deg, var(--bg-dark) 0%, #1a2639 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 1.9rem;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: rgba(255,255,255,0.7);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .cta-section .cta-btns {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 14px;
        }
        .cta-btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            background: var(--secondary);
            color: #1e293b;
            border-radius: var(--radius);
            font-weight: 700;
            font-size: 1rem;
            transition: all var(--transition);
            box-shadow: 0 4px 16px rgba(245,158,11,0.3);
        }
        .cta-btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(245,158,11,0.4);
            color: #1e293b;
        }
        .cta-btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border: 2px solid rgba(255,255,255,0.3);
            color: rgba(255,255,255,0.9);
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
        }
        .cta-btn-outline:hover {
            border-color: #fff;
            color: #fff;
            background: rgba(255,255,255,0.06);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.7);
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo {
            color: #fff;
            font-size: 1.25rem;
            margin-bottom: 14px;
        }
        .footer-brand .logo .logo-icon {
            width: 36px;
            height: 36px;
            font-size: 0.95rem;
        }
        .footer-brand p {
            font-size: 0.88rem;
            color: rgba(255,255,255,0.55);
            line-height: 1.7;
            max-width: 340px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a {
            color: rgba(255,255,255,0.55);
            font-size: 0.88rem;
            transition: color var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .footer-col ul li a:hover { color: #fff; }
        .footer-col ul li a i { font-size: 0.8rem; width: 16px; }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            padding: 24px 0;
            font-size: 0.82rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: #fff; }
        .footer-social { display: flex; gap: 12px; }
        .footer-social a {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(255,255,255,0.06);
            color: rgba(255,255,255,0.5);
            font-size: 0.95rem;
            transition: all var(--transition);
        }
        .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .related-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .article-hero h1 { font-size: 2.1rem; }
        }
        @media (max-width: 768px) {
            :root { --header-h: 64px; }
            .header-left, .header-right { display: none; }
            .mobile-toggle { display: flex; }
            .header-center { flex: 1; justify-content: flex-start; }
            .header .container { position: relative; }
            .mobile-menu-open .header-left,
            .mobile-menu-open .header-right {
                display: flex;
                flex-direction: column;
                align-items: stretch;
                position: absolute;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(14px);
                -webkit-backdrop-filter: blur(14px);
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow);
                padding: 16px 24px 24px;
                gap: 4px;
                z-index: 999;
            }
            .mobile-menu-open .header-right { top: auto; position: static; padding-top: 0; }
            .mobile-menu-open .header-left .nav-link,
            .mobile-menu-open .header-right .nav-link {
                padding: 12px 16px;
                width: 100%;
                font-size: 1rem;
            }
            .mobile-menu-open .header-right .nav-right-cta {
                width: 100%;
                justify-content: center;
                margin-top: 8px;
                padding: 12px 22px;
            }
            .article-hero { padding-top: calc(var(--header-h) + 24px); padding-bottom: 40px; min-height: 260px; }
            .article-hero h1 { font-size: 1.6rem; }
            .article-hero .hero-meta { gap: 12px; font-size: 0.82rem; }
            .article-body { padding: 28px 22px; }
            .article-body .content { font-size: 1rem; }
            .related-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-section h2 { font-size: 1.45rem; }
            .cta-btn-primary, .cta-btn-outline { width: 100%; justify-content: center; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .article-hero h1 { font-size: 1.35rem; }
            .article-body { padding: 20px 16px; border-radius: var(--radius); }
            .related-section .section-title h2 { font-size: 1.3rem; }
            .footer-grid { gap: 24px; }
            .footer-brand p { max-width: 100%; }
        }

        /* ===== Mobile overlay ===== */
        .mobile-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.3);
            z-index: 998;
        }
        .mobile-overlay.show { display: block; }

        /* ===== Animations ===== */
        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .animate-fade-up { animation: fadeUp 0.5s ease forwards; }
        .delay-1 { animation-delay: 0.1s; }
        .delay-2 { animation-delay: 0.2s; }
        .delay-3 { animation-delay: 0.3s; }

/* roulang page: category1 */
/* ========== 设计变量 ========== */
        :root {
            --color-primary: #1e40af;
            --color-primary-light: #2563eb;
            --color-primary-dark: #1e3a8a;
            --color-secondary: #f59e0b;
            --color-secondary-light: #fbbf24;
            --color-secondary-dark: #d97706;
            --color-bg: #f8fafc;
            --color-bg-alt: #f1f5f9;
            --color-bg-card: #ffffff;
            --color-text: #1e293b;
            --color-text-weak: #64748b;
            --color-text-inverse: #ffffff;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-success: #10b981;
            --color-error: #ef4444;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 32px rgba(0,0,0,0.10), 0 4px 8px rgba(0,0,0,0.04);
            --shadow-xl: 0 24px 48px rgba(0,0,0,0.12);
            --spacing-xs: 0.25rem;
            --spacing-sm: 0.5rem;
            --spacing-md: 1rem;
            --spacing-lg: 2rem;
            --spacing-xl: 3rem;
            --spacing-2xl: 5rem;
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ========== Reset & Base ========== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

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

        a:hover { color: var(--color-primary-light); }
        a:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 2px; }

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

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        ul, ol { list-style: none; }

        h1, h2, h3, h4, h5, h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--color-text);
        }

        h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
        h2 { font-size: 2rem; letter-spacing: -0.01em; }
        h3 { font-size: 1.5rem; }
        h4 { font-size: 1.125rem; }

        p { margin-bottom: var(--spacing-md); }
        p:last-child { margin-bottom: 0; }

        /* ========== 容器 ========== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-lg);
        }

        @media (max-width: 768px) {
            .container { padding: 0 var(--spacing-md); }
            h1 { font-size: 1.75rem; }
            h2 { font-size: 1.5rem; }
            h3 { font-size: 1.25rem; }
        }

        /* ========== 页眉导航 ========== */
        .header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border);
            height: var(--header-height);
            display: flex;
            align-items: center;
            transition: box-shadow var(--transition);
        }

        .header.scrolled {
            box-shadow: var(--shadow-sm);
        }

        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            gap: var(--spacing-md);
        }

        .header-left,
        .header-right {
            display: flex;
            align-items: center;
            gap: var(--spacing-xs);
            flex: 1;
        }

        .header-right {
            justify-content: flex-end;
        }

        .header-center {
            flex-shrink: 0;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--color-primary);
            letter-spacing: -0.01em;
            transition: opacity var(--transition);
            white-space: nowrap;
        }

        .logo:hover {
            opacity: 0.85;
            color: var(--color-primary);
        }

        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--color-primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 1rem;
        }

        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: var(--spacing-xs);
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 1rem;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--color-text-weak);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            white-space: nowrap;
            position: relative;
        }

        .nav-link:hover {
            color: var(--color-primary);
            background: var(--color-bg-alt);
        }

        .nav-link:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }

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

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 1rem;
            right: 1rem;
            height: 2px;
            background: var(--color-primary);
            border-radius: 1px;
        }

        /* 移动端菜单按钮 */
        .menu-toggle {
            display: none;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            color: var(--color-text);
            font-size: 1.25rem;
            transition: background var(--transition);
        }

        .menu-toggle:hover {
            background: var(--color-bg-alt);
        }

        /* 移动端导航抽屉 */
        @media (max-width: 768px) {
            .header .container {
                flex-wrap: nowrap;
            }

            .nav-left,
            .nav-right {
                display: none;
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                flex-direction: column;
                padding: var(--spacing-md) var(--spacing-lg);
                border-bottom: 1px solid var(--color-border);
                box-shadow: var(--shadow-md);
                gap: var(--spacing-xs);
                z-index: 99;
            }

            .nav-left.open,
            .nav-right.open {
                display: flex;
            }

            .nav-left {
                top: var(--header-height);
            }

            .nav-right {
                top: calc(var(--header-height) + 200px);
            }

            .nav-link {
                padding: 0.75rem 1rem;
                font-size: 1rem;
                width: 100%;
                border-radius: var(--radius-sm);
            }

            .nav-link.active::after {
                display: none;
            }

            .nav-link.active {
                background: var(--color-bg-alt);
            }

            .menu-toggle {
                display: flex;
            }

            .header-left,
            .header-right {
                flex: 0 0 auto;
            }

            .header-center {
                flex: 1;
                display: flex;
                justify-content: center;
            }

            .logo {
                font-size: 1.1rem;
            }

            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 0.85rem;
            }
        }

        @media (max-width: 480px) {
            .logo {
                font-size: 0.95rem;
            }
            .logo-icon {
                width: 28px;
                height: 28px;
                font-size: 0.75rem;
            }
            .nav-link {
                font-size: 0.9rem;
                padding: 0.6rem 0.8rem;
            }
        }

        /* ========== Hero Banner ========== */
        .hero-category {
            position: relative;
            padding: var(--spacing-2xl) 0;
            min-height: 360px;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 60%, var(--color-primary-light) 100%);
            overflow: hidden;
        }

        .hero-category::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }

        .hero-category .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .hero-category h1 {
            color: var(--color-text-inverse);
            font-size: 2.75rem;
            font-weight: 800;
            margin-bottom: var(--spacing-md);
            text-shadow: 0 2px 8px rgba(0,0,0,0.15);
        }

        .hero-category p {
            color: rgba(255,255,255,0.9);
            font-size: 1.15rem;
            max-width: 680px;
            margin: 0 auto var(--spacing-lg);
            line-height: 1.8;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: var(--spacing-sm);
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(4px);
            padding: 0.4rem 1.2rem;
            border-radius: 50px;
            color: #fff;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: var(--spacing-md);
            border: 1px solid rgba(255,255,255,0.2);
        }

        .hero-badge i {
            color: var(--color-secondary);
        }

        .hero-stats {
            display: flex;
            justify-content: center;
            gap: var(--spacing-xl);
            margin-top: var(--spacing-lg);
            flex-wrap: wrap;
        }

        .hero-stat {
            text-align: center;
            color: rgba(255,255,255,0.95);
        }

        .hero-stat .num {
            font-size: 1.75rem;
            font-weight: 800;
            display: block;
            line-height: 1.2;
        }

        .hero-stat .label {
            font-size: 0.85rem;
            opacity: 0.8;
            margin-top: var(--spacing-xs);
        }

        @media (max-width: 768px) {
            .hero-category {
                padding: var(--spacing-xl) 0;
                min-height: 280px;
            }
            .hero-category h1 {
                font-size: 1.8rem;
            }
            .hero-category p {
                font-size: 1rem;
            }
            .hero-stats {
                gap: var(--spacing-md);
            }
            .hero-stat .num {
                font-size: 1.35rem;
            }
        }

        @media (max-width: 480px) {
            .hero-category h1 {
                font-size: 1.5rem;
            }
            .hero-stats {
                flex-direction: column;
                align-items: center;
                gap: var(--spacing-sm);
            }
        }

        /* ========== 板块通用 ========== */
        .section {
            padding: var(--spacing-2xl) 0;
        }

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

        .section-title {
            text-align: center;
            margin-bottom: var(--spacing-xl);
        }

        .section-title h2 {
            margin-bottom: var(--spacing-sm);
        }

        .section-title p {
            color: var(--color-text-weak);
            font-size: 1.05rem;
            max-width: 580px;
            margin: 0 auto;
        }

        .section-divider {
            width: 60px;
            height: 4px;
            background: var(--color-secondary);
            border-radius: 2px;
            margin: var(--spacing-md) auto var(--spacing-lg);
        }

        @media (max-width: 768px) {
            .section {
                padding: var(--spacing-xl) 0;
            }
            .section-title {
                margin-bottom: var(--spacing-lg);
            }
        }

        /* ========== 卡片网格 ========== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: var(--spacing-lg);
        }

        .card-grid-3 {
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
        }

        .card-grid-4 {
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        }

        .card {
            background: var(--color-bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border);
            overflow: hidden;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }

        .card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
            background: var(--color-bg-alt);
        }

        .card-body {
            padding: var(--spacing-md) var(--spacing-lg) var(--spacing-lg);
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .card-body h3 {
            font-size: 1.15rem;
            margin-bottom: var(--spacing-sm);
        }

        .card-body p {
            color: var(--color-text-weak);
            font-size: 0.92rem;
            line-height: 1.6;
            flex: 1;
        }

        .card-body .card-meta {
            margin-top: var(--spacing-md);
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 0.85rem;
            color: var(--color-text-weak);
        }

        .card-tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            background: var(--color-bg-alt);
            padding: 0.2rem 0.8rem;
            border-radius: 50px;
            font-size: 0.78rem;
            color: var(--color-text-weak);
            font-weight: 500;
        }

        .card-tag.primary {
            background: rgba(30, 64, 175, 0.08);
            color: var(--color-primary);
        }

        .card-tag.secondary {
            background: rgba(245, 158, 11, 0.12);
            color: var(--color-secondary-dark);
        }

        .card-footer-link {
            margin-top: var(--spacing-md);
            display: inline-flex;
            align-items: center;
            gap: var(--spacing-xs);
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--color-primary);
        }

        .card-footer-link i {
            transition: transform var(--transition);
        }

        .card-footer-link:hover i {
            transform: translateX(4px);
        }

        @media (max-width: 768px) {
            .card-grid {
                grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
                gap: var(--spacing-md);
            }
            .card-body {
                padding: var(--spacing-md);
            }
        }

        @media (max-width: 480px) {
            .card-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ========== 按钮 ========== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: var(--spacing-sm);
            padding: 0.7rem 1.8rem;
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            border: 2px solid transparent;
            line-height: 1.4;
            white-space: nowrap;
        }

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

        .btn-primary {
            background: var(--color-primary);
            color: var(--color-text-inverse);
            border-color: var(--color-primary);
        }

        .btn-primary:hover {
            background: var(--color-primary-dark);
            border-color: var(--color-primary-dark);
            color: var(--color-text-inverse);
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: var(--shadow-sm);
        }

        .btn-secondary {
            background: var(--color-secondary);
            color: #fff;
            border-color: var(--color-secondary);
        }

        .btn-secondary:hover {
            background: var(--color-secondary-dark);
            border-color: var(--color-secondary-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

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

        .btn-outline:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            background: rgba(30, 64, 175, 0.04);
        }

        .btn-lg {
            padding: 0.9rem 2.4rem;
            font-size: 1.05rem;
            border-radius: var(--radius-md);
        }

        .btn-sm {
            padding: 0.4rem 1.2rem;
            font-size: 0.82rem;
        }

        .btn-block {
            width: 100%;
        }

        /* ========== 标签 ========== */
        .tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 0.25rem 0.9rem;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 500;
            background: var(--color-bg-alt);
            color: var(--color-text-weak);
            transition: all var(--transition);
        }

        .tag:hover {
            background: var(--color-border);
            color: var(--color-text);
        }

        .tag-primary {
            background: rgba(30, 64, 175, 0.08);
            color: var(--color-primary);
        }

        .tag-primary:hover {
            background: rgba(30, 64, 175, 0.15);
        }

        .tag-secondary {
            background: rgba(245, 158, 11, 0.12);
            color: var(--color-secondary-dark);
        }

        .tag-secondary:hover {
            background: rgba(245, 158, 11, 0.2);
        }

        /* ========== 图文区块 ========== */
        .feature-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-xl);
            align-items: center;
        }

        .feature-block.reverse {
            direction: rtl;
        }

        .feature-block.reverse > * {
            direction: ltr;
        }

        .feature-img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            background: var(--color-bg-alt);
            aspect-ratio: 4 / 3;
            object-fit: cover;
            width: 100%;
        }

        .feature-content h2 {
            margin-bottom: var(--spacing-md);
        }

        .feature-content p {
            color: var(--color-text-weak);
            font-size: 1.02rem;
            line-height: 1.8;
        }

        .feature-content .feature-list {
            margin-top: var(--spacing-md);
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .feature-content .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: var(--spacing-sm);
            font-size: 0.95rem;
            color: var(--color-text);
        }

        .feature-content .feature-list li i {
            color: var(--color-success);
            font-size: 1rem;
            margin-top: 0.2rem;
            flex-shrink: 0;
        }

        @media (max-width: 768px) {
            .feature-block {
                grid-template-columns: 1fr;
                gap: var(--spacing-lg);
            }
            .feature-block.reverse {
                direction: ltr;
            }
            .feature-img {
                aspect-ratio: 16 / 10;
            }
        }

        /* ========== 数据统计 ========== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: var(--spacing-lg);
            text-align: center;
        }

        .stat-item {
            padding: var(--spacing-lg);
            background: var(--color-bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            transition: all var(--transition);
        }

        .stat-item:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .stat-item .stat-icon {
            font-size: 2rem;
            color: var(--color-primary);
            margin-bottom: var(--spacing-sm);
        }

        .stat-item .stat-num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--color-text);
            line-height: 1.2;
        }

        .stat-item .stat-label {
            color: var(--color-text-weak);
            font-size: 0.9rem;
            margin-top: var(--spacing-xs);
        }

        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--spacing-md);
            }
            .stat-item {
                padding: var(--spacing-md);
            }
            .stat-item .stat-num {
                font-size: 1.5rem;
            }
        }

        @media (max-width: 480px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .faq-item {
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition);
        }

        .faq-item:hover {
            border-color: var(--color-primary-light);
        }

        .faq-question {
            padding: var(--spacing-md) var(--spacing-lg);
            font-weight: 600;
            font-size: 1rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            gap: var(--spacing-md);
            color: var(--color-text);
            transition: background var(--transition);
            background: transparent;
            width: 100%;
            text-align: left;
            border: none;
        }

        .faq-question:hover {
            background: var(--color-bg-alt);
        }

        .faq-question i {
            color: var(--color-text-weak);
            transition: transform var(--transition);
            font-size: 0.9rem;
            flex-shrink: 0;
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        .faq-answer {
            padding: 0 var(--spacing-lg) var(--spacing-md);
            color: var(--color-text-weak);
            font-size: 0.95rem;
            line-height: 1.7;
            display: none;
        }

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

        @media (max-width: 768px) {
            .faq-question {
                padding: var(--spacing-md);
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 var(--spacing-md) var(--spacing-md);
            }
        }

        /* ========== CTA ========== */
        .cta-section {
            background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
            padding: var(--spacing-2xl) 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-section h2 {
            color: var(--color-text-inverse);
            font-size: 2rem;
            margin-bottom: var(--spacing-sm);
        }

        .cta-section p {
            color: rgba(255,255,255,0.85);
            font-size: 1.1rem;
            max-width: 560px;
            margin: 0 auto var(--spacing-lg);
        }

        .cta-section .btn {
            font-size: 1.05rem;
            padding: 0.9rem 2.8rem;
        }

        .cta-section .btn-secondary {
            background: var(--color-secondary);
            border-color: var(--color-secondary);
            color: #fff;
        }

        .cta-section .btn-secondary:hover {
            background: var(--color-secondary-dark);
            border-color: var(--color-secondary-dark);
        }

        @media (max-width: 768px) {
            .cta-section {
                padding: var(--spacing-xl) 0;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section p {
                font-size: 1rem;
            }
        }

        /* ========== 分类标签列表 ========== */
        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
            justify-content: center;
        }

        .tag-list .tag {
            font-size: 0.88rem;
            padding: 0.4rem 1.2rem;
        }

        /* ========== 简介区块 ========== */
        .intro-block {
            text-align: center;
            max-width: 780px;
            margin: 0 auto;
        }

        .intro-block p {
            font-size: 1.05rem;
            color: var(--color-text-weak);
            line-height: 1.8;
        }

        /* ========== 精选推荐 ========== */
        .featured-card {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-lg);
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--color-border);
            overflow: hidden;
            transition: all var(--transition);
        }

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

        .featured-card .featured-img {
            aspect-ratio: 4 / 3;
            object-fit: cover;
            width: 100%;
            height: 100%;
            background: var(--color-bg-alt);
        }

        .featured-card .featured-body {
            padding: var(--spacing-lg);
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .featured-card .featured-body h3 {
            font-size: 1.35rem;
            margin-bottom: var(--spacing-sm);
        }

        .featured-card .featured-body p {
            color: var(--color-text-weak);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        .featured-card .featured-body .btn {
            align-self: flex-start;
            margin-top: var(--spacing-md);
        }

        @media (max-width: 768px) {
            .featured-card {
                grid-template-columns: 1fr;
            }
            .featured-card .featured-body {
                padding: var(--spacing-md);
            }
            .featured-card .featured-img {
                aspect-ratio: 16 / 9;
            }
        }

        /* ========== 页脚 ========== */
        .footer {
            background: #0f172a;
            color: rgba(255,255,255,0.75);
            padding: var(--spacing-2xl) 0 var(--spacing-lg);
        }

        .footer .logo {
            color: #fff;
            margin-bottom: var(--spacing-sm);
        }

        .footer .logo:hover {
            opacity: 0.85;
            color: #fff;
        }

        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255,255,255,0.6);
            margin-top: var(--spacing-sm);
            max-width: 360px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: var(--spacing-xl);
            padding-bottom: var(--spacing-lg);
            border-bottom: 1px solid rgba(255,255,255,0.08);
            margin-bottom: var(--spacing-lg);
        }

        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: var(--spacing-md);
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .footer-col ul li a {
            color: rgba(255,255,255,0.6);
            font-size: 0.88rem;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: var(--spacing-xs);
        }

        .footer-col ul li a:hover {
            color: #fff;
            transform: translateX(2px);
        }

        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-md);
            font-size: 0.85rem;
            color: rgba(255,255,255,0.5);
        }

        .footer-bottom a {
            color: rgba(255,255,255,0.6);
        }

        .footer-bottom a:hover {
            color: #fff;
        }

        .footer-social {
            display: flex;
            gap: var(--spacing-sm);
        }

        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255,255,255,0.06);
            color: rgba(255,255,255,0.6);
            font-size: 1rem;
            transition: all var(--transition);
        }

        .footer-social a:hover {
            background: var(--color-primary);
            color: #fff;
            transform: translateY(-2px);
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-lg);
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-brand p {
                max-width: 100%;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--spacing-md);
            }
            .footer-col {
                text-align: center;
            }
            .footer-col ul {
                align-items: center;
            }
            .footer-brand {
                text-align: center;
            }
            .footer-brand p {
                margin-left: auto;
                margin-right: auto;
            }
        }

        /* ========== 面包屑 ========== */
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: var(--spacing-xs);
            font-size: 0.85rem;
            color: var(--color-text-weak);
            margin-bottom: var(--spacing-md);
            padding-top: var(--spacing-sm);
        }

        .breadcrumb a {
            color: var(--color-text-weak);
        }

        .breadcrumb a:hover {
            color: var(--color-primary);
        }

        .breadcrumb span {
            color: var(--color-text);
        }

        .breadcrumb i {
            font-size: 0.65rem;
            color: var(--color-border);
        }

        /* ========== 工具类 ========== */
        .text-center { text-align: center; }
        .mt-lg { margin-top: var(--spacing-lg); }
        .mb-lg { margin-bottom: var(--spacing-lg); }
        .gap-md { gap: var(--spacing-md); }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .flex-wrap { flex-wrap: wrap; }

        /* ========== 响应式微调 ========== */
        @media (max-width: 1024px) {
            .card-grid-3 {
                grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            }
            .card-grid-4 {
                grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
            }
        }

        @media (max-width: 520px) {
            .hero-category h1 {
                font-size: 1.35rem;
            }
            .hero-category p {
                font-size: 0.92rem;
            }
            .btn-lg {
                padding: 0.7rem 1.6rem;
                font-size: 0.9rem;
            }
            .section {
                padding: var(--spacing-lg) 0;
            }
            .stat-item .stat-num {
                font-size: 1.3rem;
            }
        }