/* roulang page: index */
/* ===== 设计变量 ===== */
    :root {
        --primary: #2563eb;
        --primary-dark: #1d4ed8;
        --primary-light: #dbeafe;
        --primary-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
        --accent: #f59e0b;
        --accent-dark: #d97706;
        --accent-light: #fef3c7;
        --bg: #ffffff;
        --bg-alt: #f8fafc;
        --bg-dark: #0f172a;
        --bg-card: #ffffff;
        --text: #1e293b;
        --text-light: #64748b;
        --text-white: #ffffff;
        --text-muted: #94a3b8;
        --border: #e2e8f0;
        --border-light: #f1f5f9;
        --radius: 16px;
        --radius-sm: 10px;
        --radius-xs: 6px;
        --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
        --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.1);
        --shadow-hover: 0 16px 48px rgba(37, 99, 235, 0.15);
        --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
        --container: 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(--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: var(--transition);
    }

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

    ul,
    ol {
        list-style: none;
    }

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

    button {
        cursor: pointer;
    }

    /* ===== 容器 ===== */
    .container {
        width: 100%;
        max-width: var(--container);
        margin: 0 auto;
        padding: 0 24px;
    }

    @media (max-width: 768px) {
        .container {
            padding: 0 16px;
        }
    }

    /* ===== 导航 ===== */
    .header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        height: var(--header-height);
        background: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border);
        transition: var(--transition);
    }

    .header.scrolled {
        box-shadow: 0 4px 30px rgba(0, 0, 0, 0.06);
    }

    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 100%;
    }

    .logo {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 22px;
        font-weight: 700;
        color: var(--text);
        text-decoration: none;
        letter-spacing: -0.5px;
    }

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

    .logo-icon {
        width: 38px;
        height: 38px;
        background: var(--primary-gradient);
        border-radius: var(--radius-xs);
        display: flex;
        align-items: center;
        justify-content: center;
        color: #fff;
        font-size: 20px;
        font-weight: 700;
        flex-shrink: 0;
    }

    .logo-text {
        background: var(--primary-gradient);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .nav-main {
        display: flex;
        align-items: center;
        gap: 8px;
    }

    .nav-main a {
        padding: 8px 18px;
        border-radius: var(--radius-sm);
        font-size: 15px;
        font-weight: 500;
        color: var(--text-light);
        text-decoration: none;
        transition: var(--transition);
        position: relative;
    }

    .nav-main a:hover {
        color: var(--primary);
        background: var(--primary-light);
    }

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

    .nav-main a.active::after {
        content: '';
        position: absolute;
        bottom: 4px;
        left: 50%;
        transform: translateX(-50%);
        width: 20px;
        height: 3px;
        background: var(--primary);
        border-radius: 2px;
    }

    .nav-actions {
        display: flex;
        align-items: center;
        gap: 12px;
    }

    .search-box {
        display: flex;
        align-items: center;
        background: var(--bg-alt);
        border: 1px solid var(--border);
        border-radius: var(--radius-sm);
        padding: 0 16px;
        height: 40px;
        transition: var(--transition);
        width: 200px;
    }

    .search-box:focus-within {
        border-color: var(--primary);
        box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }

    .search-box input {
        flex: 1;
        height: 100%;
        background: transparent;
        color: var(--text);
        font-size: 14px;
        padding: 0 8px;
    }

    .search-box input::placeholder {
        color: var(--text-muted);
    }

    .search-box button {
        color: var(--text-light);
        font-size: 16px;
        transition: var(--transition);
        padding: 4px;
    }

    .search-box button:hover {
        color: var(--primary);
    }

    .btn-primary {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 10px 28px;
        background: var(--primary-gradient);
        color: var(--text-white);
        border-radius: var(--radius-sm);
        font-size: 15px;
        font-weight: 600;
        text-decoration: none;
        transition: var(--transition);
        border: none;
        box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
    }

    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 28px rgba(37, 99, 235, 0.4);
        color: var(--text-white);
    }

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

    .btn-outline {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 10px 28px;
        background: transparent;
        color: var(--primary);
        border: 2px solid var(--primary);
        border-radius: var(--radius-sm);
        font-size: 15px;
        font-weight: 600;
        text-decoration: none;
        transition: var(--transition);
    }

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

    .btn-accent {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 12px 32px;
        background: var(--accent);
        color: #1e293b;
        border-radius: var(--radius-sm);
        font-size: 16px;
        font-weight: 700;
        text-decoration: none;
        transition: var(--transition);
        box-shadow: 0 4px 16px rgba(245, 158, 11, 0.35);
    }

    .btn-accent:hover {
        background: var(--accent-dark);
        transform: translateY(-2px);
        box-shadow: 0 8px 28px rgba(245, 158, 11, 0.45);
        color: #1e293b;
    }

    /* 移动端菜单按钮 */
    .menu-toggle {
        display: none;
        flex-direction: column;
        justify-content: center;
        gap: 5px;
        width: 40px;
        height: 40px;
        padding: 8px;
        cursor: pointer;
        background: var(--bg-alt);
        border-radius: var(--radius-xs);
        border: 1px solid var(--border);
    }

    .menu-toggle span {
        display: block;
        width: 100%;
        height: 2.5px;
        background: var(--text);
        border-radius: 2px;
        transition: var(--transition);
    }

    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    @media (max-width: 920px) {
        .search-box {
            width: 140px;
        }
        .nav-main a {
            padding: 8px 14px;
            font-size: 14px;
        }
    }

    @media (max-width: 768px) {
        .menu-toggle {
            display: flex;
        }

        .nav-main {
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(20px);
            flex-direction: column;
            padding: 16px 24px 24px;
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-lg);
            transform: translateY(-120%);
            opacity: 0;
            transition: var(--transition);
            pointer-events: none;
            gap: 4px;
        }

        .nav-main.open {
            transform: translateY(0);
            opacity: 1;
            pointer-events: all;
        }

        .nav-main a {
            width: 100%;
            padding: 12px 16px;
            font-size: 16px;
        }

        .nav-main a.active::after {
            display: none;
        }

        .nav-actions .search-box {
            display: none;
        }

        .nav-actions .btn-primary {
            padding: 8px 18px;
            font-size: 14px;
        }
    }

    @media (max-width: 480px) {
        .logo-text {
            font-size: 18px;
        }
        .logo-icon {
            width: 32px;
            height: 32px;
            font-size: 16px;
        }
    }

    /* ===== Hero ===== */
    .hero {
        padding-top: var(--header-height);
        min-height: 100vh;
        display: flex;
        align-items: center;
        position: relative;
        background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
        overflow: hidden;
    }

    .hero-bg {
        position: absolute;
        inset: 0;
        background-image: url('/assets/images/backpic/back-1.png');
        background-size: cover;
        background-position: center;
        opacity: 0.25;
        z-index: 0;
    }

    .hero-overlay {
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 0%, rgba(30, 41, 59, 0.7) 100%);
        z-index: 1;
    }

    .hero .container {
        position: relative;
        z-index: 2;
        padding-top: 40px;
        padding-bottom: 60px;
    }

    .hero-content {
        max-width: 720px;
    }

    .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 6px 18px;
        background: rgba(37, 99, 235, 0.2);
        border: 1px solid rgba(37, 99, 235, 0.3);
        border-radius: 50px;
        color: #93c5fd;
        font-size: 14px;
        font-weight: 500;
        margin-bottom: 24px;
        backdrop-filter: blur(10px);
    }

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

    .hero h1 {
        font-size: 56px;
        font-weight: 800;
        line-height: 1.12;
        color: var(--text-white);
        margin-bottom: 20px;
        letter-spacing: -1.5px;
    }

    .hero h1 .highlight {
        background: var(--primary-gradient);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .hero p {
        font-size: 18px;
        line-height: 1.8;
        color: var(--text-muted);
        margin-bottom: 36px;
        max-width: 600px;
    }

    .hero-actions {
        display: flex;
        align-items: center;
        gap: 16px;
        flex-wrap: wrap;
    }

    .hero-stats {
        display: flex;
        gap: 40px;
        margin-top: 56px;
        padding-top: 32px;
        border-top: 1px solid rgba(255, 255, 255, 0.08);
    }

    .hero-stat h3 {
        font-size: 32px;
        font-weight: 800;
        color: var(--text-white);
        letter-spacing: -0.5px;
    }

    .hero-stat h3 span {
        color: var(--accent);
    }

    .hero-stat p {
        font-size: 14px;
        color: var(--text-muted);
        margin: 4px 0 0;
        font-weight: 400;
    }

    @media (max-width: 920px) {
        .hero h1 {
            font-size: 42px;
        }
        .hero-stats {
            gap: 24px;
            flex-wrap: wrap;
        }
    }

    @media (max-width: 768px) {
        .hero {
            min-height: auto;
            padding: 100px 0 60px;
        }
        .hero h1 {
            font-size: 34px;
        }
        .hero p {
            font-size: 16px;
        }
        .hero-stats {
            margin-top: 40px;
            padding-top: 24px;
            gap: 20px;
        }
        .hero-stat h3 {
            font-size: 26px;
        }
    }

    @media (max-width: 480px) {
        .hero h1 {
            font-size: 28px;
        }
        .hero-actions .btn-primary,
        .hero-actions .btn-outline {
            width: 100%;
            justify-content: center;
        }
        .hero-stats {
            flex-direction: column;
            gap: 16px;
        }
    }

    /* ===== 通用板块 ===== */
    .section {
        padding: 80px 0;
    }

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

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

    .section-header {
        text-align: center;
        margin-bottom: 56px;
    }

    .section-header h2 {
        font-size: 36px;
        font-weight: 800;
        color: var(--text);
        letter-spacing: -0.5px;
        margin-bottom: 12px;
    }

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

    .section-header p {
        font-size: 17px;
        color: var(--text-light);
        max-width: 600px;
        margin: 0 auto;
        line-height: 1.7;
    }

    .section-header .subtitle {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 4px 16px;
        background: var(--primary-light);
        color: var(--primary);
        border-radius: 50px;
        font-size: 14px;
        font-weight: 600;
        margin-bottom: 16px;
    }

    .section-dark .section-header .subtitle {
        background: rgba(37, 99, 235, 0.2);
        color: #93c5fd;
    }

    @media (max-width: 768px) {
        .section {
            padding: 56px 0;
        }
        .section-header {
            margin-bottom: 40px;
        }
        .section-header h2 {
            font-size: 28px;
        }
    }

    /* ===== 卡片网格 ===== */
    .grid-3 {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }

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

    .grid-2 {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

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

    @media (max-width: 768px) {
        .grid-3,
        .grid-4 {
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }
        .grid-2 {
            grid-template-columns: 1fr;
        }
    }

    @media (max-width: 480px) {
        .grid-3,
        .grid-4 {
            grid-template-columns: 1fr;
        }
    }

    /* ===== 卡片 ===== */
    .card {
        background: var(--bg-card);
        border-radius: var(--radius);
        overflow: hidden;
        border: 1px solid var(--border);
        transition: var(--transition);
        box-shadow: var(--shadow);
    }

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

    .card-img {
        width: 100%;
        aspect-ratio: 16/9;
        object-fit: cover;
        display: block;
        background: var(--bg-alt);
    }

    .card-body {
        padding: 24px;
    }

    .card-body h3 {
        font-size: 18px;
        font-weight: 700;
        color: var(--text);
        margin-bottom: 8px;
        line-height: 1.4;
    }

    .card-body p {
        font-size: 14px;
        color: var(--text-light);
        line-height: 1.6;
    }

    .card-tag {
        display: inline-block;
        padding: 2px 12px;
        background: var(--primary-light);
        color: var(--primary);
        border-radius: 50px;
        font-size: 12px;
        font-weight: 600;
        margin-bottom: 10px;
    }

    .card-meta {
        display: flex;
        align-items: center;
        gap: 16px;
        margin-top: 14px;
        font-size: 13px;
        color: var(--text-muted);
    }

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

    .card-footer {
        padding: 16px 24px;
        border-top: 1px solid var(--border);
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .card-link {
        font-size: 14px;
        font-weight: 600;
        color: var(--primary);
        display: inline-flex;
        align-items: center;
        gap: 6px;
    }

    .card-link:hover {
        gap: 10px;
    }

    /* ===== 特色卡片（图标） ===== */
    .feature-card {
        text-align: center;
        padding: 36px 28px;
        background: var(--bg-card);
        border-radius: var(--radius);
        border: 1px solid var(--border);
        transition: var(--transition);
        box-shadow: var(--shadow);
    }

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

    .feature-icon {
        width: 64px;
        height: 64px;
        border-radius: 16px;
        background: var(--primary-light);
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 20px;
        font-size: 28px;
        color: var(--primary);
        transition: var(--transition);
    }

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

    .feature-card h3 {
        font-size: 18px;
        font-weight: 700;
        margin-bottom: 10px;
        color: var(--text);
    }

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

    /* ===== 分类入口 ===== */
    .category-grid {
        display: grid;
        grid-template-columns: repeat(6, 1fr);
        gap: 16px;
    }

    .category-item {
        text-align: center;
        padding: 24px 12px;
        background: var(--bg-card);
        border-radius: var(--radius);
        border: 1px solid var(--border);
        transition: var(--transition);
        cursor: pointer;
        text-decoration: none;
        color: var(--text);
    }

    .category-item:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-hover);
        border-color: var(--primary-light);
        color: var(--primary);
    }

    .category-item .cat-icon {
        width: 48px;
        height: 48px;
        border-radius: 12px;
        background: var(--primary-light);
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 12px;
        font-size: 22px;
        color: var(--primary);
        transition: var(--transition);
    }

    .category-item:hover .cat-icon {
        background: var(--primary);
        color: #fff;
    }

    .category-item h4 {
        font-size: 14px;
        font-weight: 600;
        margin-bottom: 4px;
    }

    .category-item span {
        font-size: 12px;
        color: var(--text-muted);
    }

    @media (max-width: 1024px) {
        .category-grid {
            grid-template-columns: repeat(3, 1fr);
        }
    }

    @media (max-width: 520px) {
        .category-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }

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

    .step-item {
        text-align: center;
        padding: 32px 20px;
        position: relative;
    }

    .step-number {
        width: 56px;
        height: 56px;
        border-radius: 50%;
        background: var(--primary-gradient);
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 20px;
        font-size: 22px;
        font-weight: 800;
        color: #fff;
        box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
    }

    .step-item h4 {
        font-size: 17px;
        font-weight: 700;
        margin-bottom: 8px;
        color: var(--text);
    }

    .step-item p {
        font-size: 14px;
        color: var(--text-light);
        line-height: 1.6;
    }

    .step-connector {
        position: relative;
    }

    .step-connector::after {
        content: '';
        position: absolute;
        top: 28px;
        left: 60%;
        width: 80%;
        height: 2px;
        background: linear-gradient(90deg, var(--primary), var(--primary-light));
        opacity: 0.3;
    }

    .step-connector:last-child::after {
        display: none;
    }

    @media (max-width: 920px) {
        .steps {
            grid-template-columns: repeat(2, 1fr);
        }
        .step-connector::after {
            display: none;
        }
    }

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

    /* ===== 内容列表（CMS） ===== */
    .post-list {
        display: grid;
        grid-template-columns: 1fr;
        gap: 16px;
    }

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

    .post-item:hover {
        transform: translateX(4px);
        box-shadow: var(--shadow);
        border-color: var(--primary-light);
    }

    .post-thumb {
        width: 120px;
        height: 80px;
        border-radius: var(--radius-xs);
        object-fit: cover;
        flex-shrink: 0;
        background: var(--bg-alt);
    }

    .post-info {
        flex: 1;
        min-width: 0;
    }

    .post-info h3 {
        font-size: 16px;
        font-weight: 600;
        margin-bottom: 6px;
        line-height: 1.4;
    }

    .post-info h3 a {
        color: var(--text);
    }

    .post-info h3 a:hover {
        color: var(--primary);
    }

    .post-info p {
        font-size: 14px;
        color: var(--text-light);
        line-height: 1.6;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .post-meta {
        display: flex;
        align-items: center;
        gap: 16px;
        margin-top: 8px;
        font-size: 13px;
        color: var(--text-muted);
    }

    .post-meta .cat-badge {
        padding: 2px 12px;
        background: var(--primary-light);
        color: var(--primary);
        border-radius: 50px;
        font-size: 12px;
        font-weight: 600;
    }

    @media (max-width: 600px) {
        .post-item {
            flex-direction: column;
            padding: 16px;
        }
        .post-thumb {
            width: 100%;
            height: 140px;
        }
    }

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

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

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

    .faq-question {
        padding: 20px 24px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        cursor: pointer;
        font-size: 16px;
        font-weight: 600;
        color: var(--text);
        background: none;
        width: 100%;
        text-align: left;
        gap: 16px;
        user-select: none;
    }

    .faq-question i {
        color: var(--primary);
        font-size: 18px;
        transition: var(--transition);
        flex-shrink: 0;
    }

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

    .faq-answer {
        padding: 0 24px 20px;
        font-size: 15px;
        color: var(--text-light);
        line-height: 1.7;
        display: none;
    }

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

    /* ===== CTA ===== */
    .cta-section {
        padding: 80px 0;
        background: var(--primary-gradient);
        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;
    }

    .cta-content {
        position: relative;
        z-index: 1;
        text-align: center;
        max-width: 700px;
        margin: 0 auto;
    }

    .cta-content h2 {
        font-size: 36px;
        font-weight: 800;
        color: var(--text-white);
        margin-bottom: 16px;
        letter-spacing: -0.5px;
    }

    .cta-content p {
        font-size: 17px;
        color: rgba(255, 255, 255, 0.8);
        margin-bottom: 32px;
        line-height: 1.7;
    }

    .cta-content .btn-accent {
        font-size: 18px;
        padding: 14px 40px;
    }

    @media (max-width: 768px) {
        .cta-section {
            padding: 56px 0;
        }
        .cta-content h2 {
            font-size: 28px;
        }
    }

    /* ===== 页脚 ===== */
    .footer {
        background: var(--bg-dark);
        color: var(--text-white);
        padding: 60px 0 32px;
    }

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

    .footer-brand .logo {
        color: var(--text-white);
        margin-bottom: 16px;
    }

    .footer-brand p {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.7;
        max-width: 320px;
    }

    .footer-social {
        display: flex;
        gap: 12px;
        margin-top: 20px;
    }

    .footer-social a {
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background: rgba(255, 255, 255, 0.06);
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--text-muted);
        font-size: 18px;
        transition: var(--transition);
        border: 1px solid rgba(255, 255, 255, 0.06);
    }

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

    .footer-col h4 {
        font-size: 16px;
        font-weight: 700;
        color: var(--text-white);
        margin-bottom: 20px;
    }

    .footer-col a {
        display: block;
        padding: 6px 0;
        font-size: 14px;
        color: var(--text-muted);
        text-decoration: none;
        transition: var(--transition);
    }

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

    .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, 0.06);
        padding-top: 24px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 12px;
        font-size: 14px;
        color: var(--text-muted);
    }

    .footer-bottom a {
        color: var(--text-muted);
    }

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

    @media (max-width: 920px) {
        .footer-grid {
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
    }

    @media (max-width: 520px) {
        .footer-grid {
            grid-template-columns: 1fr;
            gap: 24px;
        }
        .footer-bottom {
            flex-direction: column;
            text-align: center;
        }
    }

    /* ===== 空状态 ===== */
    .empty-state {
        text-align: center;
        padding: 40px 20px;
        color: var(--text-muted);
        font-size: 16px;
        background: var(--bg-alt);
        border-radius: var(--radius-sm);
        border: 1px dashed var(--border);
    }

    .empty-state i {
        font-size: 40px;
        margin-bottom: 12px;
        display: block;
        color: var(--text-muted);
    }

    /* ===== 辅助 ===== */
    .text-center {
        text-align: center;
    }
    .mt-16 {
        margin-top: 16px;
    }
    .mt-24 {
        margin-top: 24px;
    }
    .mt-32 {
        margin-top: 32px;
    }
    .mt-48 {
        margin-top: 48px;
    }
    .gap-8 {
        gap: 8px;
    }
    .flex-center {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .flex-wrap {
        flex-wrap: wrap;
    }

    /* ===== 动画 ===== */
    @keyframes fadeUp {
        from {
            opacity: 0;
            transform: translateY(30px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .animate-fade-up {
        animation: fadeUp 0.6s ease-out forwards;
    }

    .delay-1 {
        animation-delay: 0.1s;
    }
    .delay-2 {
        animation-delay: 0.2s;
    }
    .delay-3 {
        animation-delay: 0.3s;
    }
    .delay-4 {
        animation-delay: 0.4s;
    }

    /* ===== 分类页特有 ===== */
    .banner-page {
        padding-top: var(--header-height);
        padding-bottom: 60px;
        background: linear-gradient(135deg, #0f172a, #1e293b);
        position: relative;
        overflow: hidden;
    }

    .banner-page .banner-bg {
        position: absolute;
        inset: 0;
        background-image: url('/assets/images/backpic/back-3.png');
        background-size: cover;
        background-position: center;
        opacity: 0.15;
    }

    .banner-page .container {
        position: relative;
        z-index: 1;
        padding-top: 60px;
    }

    .banner-page h1 {
        font-size: 40px;
        font-weight: 800;
        color: var(--text-white);
        margin-bottom: 12px;
        letter-spacing: -0.5px;
    }

    .banner-page p {
        font-size: 17px;
        color: var(--text-muted);
        max-width: 600px;
        line-height: 1.7;
    }

    .banner-page .breadcrumb {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 14px;
        color: var(--text-muted);
        margin-bottom: 24px;
    }

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

    .banner-page .breadcrumb a:hover {
        color: #fff;
    }

    .banner-page .breadcrumb i {
        font-size: 12px;
    }

    @media (max-width: 768px) {
        .banner-page h1 {
            font-size: 30px;
        }
        .banner-page .container {
            padding-top: 40px;
        }
        .banner-page {
            padding-bottom: 40px;
        }
    }

    /* ===== 文章页 ===== */
    .article-wrapper {
        max-width: 800px;
        margin: 0 auto;
        padding: 120px 24px 60px;
    }

    .article-header {
        margin-bottom: 40px;
    }

    .article-header .cat-badge {
        display: inline-block;
        padding: 4px 16px;
        background: var(--primary-light);
        color: var(--primary);
        border-radius: 50px;
        font-size: 14px;
        font-weight: 600;
        margin-bottom: 16px;
    }

    .article-header h1 {
        font-size: 36px;
        font-weight: 800;
        color: var(--text);
        line-height: 1.25;
        letter-spacing: -0.5px;
        margin-bottom: 16px;
    }

    .article-header .article-meta {
        display: flex;
        align-items: center;
        gap: 20px;
        font-size: 14px;
        color: var(--text-muted);
        flex-wrap: wrap;
    }

    .article-header .article-meta i {
        margin-right: 6px;
    }

    .article-body {
        font-size: 17px;
        line-height: 1.9;
        color: var(--text);
    }

    .article-body p {
        margin-bottom: 20px;
    }

    .article-body h2 {
        font-size: 26px;
        font-weight: 700;
        margin: 40px 0 16px;
        color: var(--text);
    }

    .article-body h3 {
        font-size: 20px;
        font-weight: 600;
        margin: 28px 0 12px;
        color: var(--text);
    }

    .article-body ul,
    .article-body ol {
        margin: 16px 0;
        padding-left: 24px;
    }

    .article-body li {
        margin-bottom: 8px;
        list-style: disc;
    }

    .article-body img {
        border-radius: var(--radius-sm);
        margin: 24px 0;
        border: 1px solid var(--border);
    }

    .article-body blockquote {
        border-left: 4px solid var(--primary);
        padding: 16px 24px;
        background: var(--bg-alt);
        border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
        margin: 24px 0;
        font-style: italic;
        color: var(--text-light);
    }

    .article-not-found {
        text-align: center;
        padding: 80px 20px;
    }

    .article-not-found i {
        font-size: 64px;
        color: var(--text-muted);
        margin-bottom: 20px;
        display: block;
    }

    .article-not-found h2 {
        font-size: 28px;
        font-weight: 700;
        margin-bottom: 12px;
        color: var(--text);
    }

    .article-not-found p {
        color: var(--text-light);
        margin-bottom: 24px;
    }

    @media (max-width: 768px) {
        .article-wrapper {
            padding: 100px 16px 40px;
        }
        .article-header h1 {
            font-size: 28px;
        }
        .article-body {
            font-size: 16px;
        }
    }

    @media (max-width: 480px) {
        .article-header h1 {
            font-size: 24px;
        }
        .article-body h2 {
            font-size: 22px;
        }
    }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --primary-gradient: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
            --secondary: #f59e0b;
            --secondary-light: #fef3c7;
            --accent: #10b981;
            --accent-light: #d1fae5;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --bg-gray: #f1f5f9;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-light: #94a3b8;
            --text-white: #ffffff;
            --border-color: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --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 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.16);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --container-max: 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(--text-primary);
            background-color: var(--bg-body);
            -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: var(--transition);
        }

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

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

        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

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

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

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            transition: var(--transition);
        }

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

        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 24px;
            font-weight: 800;
            color: var(--text-primary);
            text-decoration: none;
            letter-spacing: -0.5px;
        }

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

        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: var(--primary-gradient);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 20px;
            font-weight: 800;
            flex-shrink: 0;
        }

        .nav-main {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-main a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }

        .nav-main a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }

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

        .nav-main a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .search-box {
            display: flex;
            align-items: center;
            background: var(--bg-gray);
            border-radius: 100px;
            padding: 0 16px;
            height: 42px;
            border: 1px solid transparent;
            transition: var(--transition);
        }

        .search-box:focus-within {
            border-color: var(--primary);
            background: var(--bg-white);
            box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
        }

        .search-box input {
            background: none;
            border: none;
            outline: none;
            padding: 0 8px;
            font-size: 14px;
            color: var(--text-primary);
            width: 160px;
        }

        .search-box input::placeholder {
            color: var(--text-light);
        }

        .search-box button {
            color: var(--text-light);
            font-size: 16px;
            transition: var(--transition);
        }

        .search-box button:hover {
            color: var(--primary);
        }

        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            background: var(--primary-gradient);
            color: #fff;
            border-radius: 100px;
            font-weight: 600;
            font-size: 14px;
            transition: var(--transition);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
        }

        .btn-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.4);
            color: #fff;
        }

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

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

        .menu-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: var(--transition);
        }

        .menu-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }

        .menu-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .menu-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        @media (max-width: 900px) {
            .nav-main {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-lg);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
            }

            .nav-main.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }

            .nav-main a {
                width: 100%;
                padding: 12px 16px;
                font-size: 16px;
            }

            .nav-main a.active::after {
                display: none;
            }

            .menu-toggle {
                display: flex;
            }

            .search-box {
                display: none;
            }

            .btn-cta {
                padding: 8px 16px;
                font-size: 13px;
            }
        }

        @media (max-width: 520px) {
            .logo {
                font-size: 18px;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 16px;
            }
            .btn-cta {
                padding: 6px 14px;
                font-size: 12px;
                gap: 4px;
            }
        }

        /* ===== Hero / Banner ===== */
        .page-hero {
            padding: 140px 0 80px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            position: relative;
            isolation: isolate;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(15, 23, 42, 0.70) 100%);
            z-index: 1;
        }

        .page-hero .container {
            position: relative;
            z-index: 2;
        }

        .page-hero-content {
            max-width: 720px;
        }

        .page-hero-content .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 20px;
        }

        .page-hero-content .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }

        .page-hero-content .breadcrumb a:hover {
            color: #fff;
        }

        .page-hero-content .breadcrumb span {
            color: rgba(255, 255, 255, 0.4);
        }

        .page-hero-content h1 {
            font-size: 48px;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
            margin-bottom: 16px;
            letter-spacing: -1px;
        }

        .page-hero-content h1 .highlight {
            background: linear-gradient(135deg, #60a5fa, #a78bfa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .page-hero-content p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.8);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 600px;
        }

        .page-hero-content .hero-stats {
            display: flex;
            gap: 40px;
            flex-wrap: wrap;
        }

        .page-hero-content .hero-stats .stat-item {
            text-align: center;
        }

        .page-hero-content .hero-stats .stat-num {
            font-size: 32px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }

        .page-hero-content .hero-stats .stat-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
        }

        @media (max-width: 768px) {
            .page-hero {
                padding: 120px 0 56px;
            }
            .page-hero-content h1 {
                font-size: 32px;
            }
            .page-hero-content p {
                font-size: 16px;
            }
            .page-hero-content .hero-stats {
                gap: 24px;
            }
            .page-hero-content .hero-stats .stat-num {
                font-size: 24px;
            }
        }

        @media (max-width: 520px) {
            .page-hero-content h1 {
                font-size: 26px;
            }
            .page-hero-content .hero-stats {
                gap: 16px;
            }
            .page-hero-content .hero-stats .stat-num {
                font-size: 20px;
            }
        }

        /* ===== Section Common ===== */
        .section {
            padding: 80px 0;
        }

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

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

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

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-header h2 {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }

        .section-header h2 .highlight {
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .section-header p {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.7;
        }

        .section-header.light p {
            color: rgba(255, 255, 255, 0.7);
        }

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

        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .section-header h2 {
                font-size: 28px;
            }
            .section-header p {
                font-size: 15px;
            }
        }

        @media (max-width: 520px) {
            .section-header h2 {
                font-size: 24px;
            }
        }

        /* ===== Cards Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

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

        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }

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

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

        .card-body .tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 100px;
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
            background: var(--primary-light);
            margin-bottom: 10px;
        }

        .card-body h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .card-body h3 a {
            color: var(--text-primary);
        }

        .card-body h3 a:hover {
            color: var(--primary);
        }

        .card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 12px;
        }

        .card-body .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-light);
        }

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

        .card-body .btn-text {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: 14px;
            color: var(--primary);
            margin-top: 8px;
            transition: var(--transition);
        }

        .card-body .btn-text:hover {
            gap: 10px;
            color: var(--primary-dark);
        }

        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }

        @media (max-width: 600px) {
            .card-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }

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

        .step-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
        }

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

        .step-card .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: #fff;
            font-size: 22px;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .step-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .step-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        @media (max-width: 1024px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }

        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .step-card {
                padding: 24px 16px;
            }
        }

        /* ===== Platform Tabs / Features ===== */
        .platform-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .platform-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            text-align: center;
        }

        .platform-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }

        .platform-card .icon-wrap {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 64px;
            height: 64px;
            border-radius: var(--radius-md);
            background: var(--primary-light);
            color: var(--primary);
            font-size: 28px;
            margin-bottom: 16px;
            transition: var(--transition);
        }

        .platform-card:hover .icon-wrap {
            background: var(--primary);
            color: #fff;
        }

        .platform-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .platform-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .platform-card .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 16px;
            padding: 8px 20px;
            border-radius: 100px;
            border: 2px solid var(--primary);
            color: var(--primary);
            font-weight: 600;
            font-size: 14px;
            transition: var(--transition);
        }

        .platform-card .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            gap: 10px;
        }

        @media (max-width: 1024px) {
            .platform-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }

        @media (max-width: 600px) {
            .platform-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .platform-card {
                padding: 24px 16px;
            }
        }

        /* ===== Notice / Tips ===== */
        .notice-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }

        .notice-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            background: var(--bg-white);
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .notice-item:hover {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-md);
        }

        .notice-item .icon {
            flex-shrink: 0;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: #fff;
            background: var(--primary);
        }

        .notice-item .icon.success {
            background: var(--accent);
        }

        .notice-item .icon.warning {
            background: var(--secondary);
        }

        .notice-item .icon.danger {
            background: #ef4444;
        }

        .notice-item h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .notice-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        @media (max-width: 768px) {
            .notice-list {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .notice-item {
                padding: 16px 18px;
            }
        }

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

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

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

        .faq-item .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            transition: var(--transition);
            gap: 12px;
        }

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

        .faq-item .faq-question i {
            font-size: 14px;
            color: var(--text-light);
            transition: var(--transition);
            flex-shrink: 0;
        }

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

        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        .faq-item .faq-answer p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .faq-item .faq-question {
                padding: 14px 16px;
                font-size: 15px;
            }
            .faq-item .faq-answer {
                padding: 0 16px;
            }
            .faq-item.active .faq-answer {
                padding: 0 16px 16px;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary-gradient);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }

        .cta-section .container {
            position: relative;
            z-index: 1;
        }

        .cta-section h2 {
            font-size: 36px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 32px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-section .btn-cta-white {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 40px;
            background: #fff;
            color: var(--primary);
            border-radius: 100px;
            font-weight: 700;
            font-size: 16px;
            transition: var(--transition);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
        }

        .cta-section .btn-cta-white:hover {
            transform: translateY(-3px);
            box-shadow: 0 16px 48px rgba(0, 0, 0, 0.2);
            color: var(--primary-dark);
        }

        .cta-section .btn-cta-white:active {
            transform: translateY(0);
        }

        @media (max-width: 768px) {
            .cta-section {
                padding: 56px 0;
            }
            .cta-section h2 {
                font-size: 28px;
            }
            .cta-section p {
                font-size: 16px;
            }
            .cta-section .btn-cta-white {
                padding: 14px 28px;
                font-size: 15px;
            }
        }

        @media (max-width: 520px) {
            .cta-section h2 {
                font-size: 24px;
            }
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 64px 0 32px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 48px;
        }

        .footer-brand .logo {
            margin-bottom: 16px;
            color: #fff;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            max-width: 360px;
        }

        .footer-social {
            display: flex;
            gap: 12px;
            margin-top: 20px;
        }

        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.7);
            font-size: 18px;
            transition: var(--transition);
        }

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

        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }

        .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            padding: 5px 0;
            transition: var(--transition);
        }

        .footer-col a:hover {
            color: #fff;
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

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

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

        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }

        @media (max-width: 600px) {
            .footer {
                padding: 40px 0 24px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== Buttons ===== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: var(--primary-gradient);
            color: #fff;
            border-radius: 100px;
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
            color: #fff;
        }

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

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            border: 2px solid var(--primary);
            color: var(--primary);
            border-radius: 100px;
            font-weight: 600;
            font-size: 14px;
            transition: var(--transition);
            background: transparent;
        }

        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mt-48 {
            margin-top: 48px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .mb-32 {
            margin-bottom: 32px;
        }
        .gap-16 {
            gap: 16px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* ===== Focus accessibility ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ===== Smooth scroll offset for anchor ===== */
        .anchor-offset {
            scroll-margin-top: calc(var(--header-height) + 20px);
        }

        /* ===== Back to top ===== */
        .back-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            box-shadow: var(--shadow-md);
            z-index: 99;
            opacity: 0;
            visibility: hidden;
            transform: translateY(20px);
            transition: var(--transition);
        }

        .back-top.visible {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .back-top:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            color: #fff;
        }

        @media (max-width: 520px) {
            .back-top {
                bottom: 16px;
                right: 16px;
                width: 40px;
                height: 40px;
                font-size: 16px;
            }
        }

/* roulang page: article */
:root {
            --primary: #e74c3c;
            --primary-dark: #c0392b;
            --primary-light: #f5b7b1;
            --accent: #f39c12;
            --accent-dark: #e67e22;
            --bg: #f8f9fa;
            --bg-alt: #1a1a2e;
            --bg-card: #ffffff;
            --text: #2c3e50;
            --text-light: #6c757d;
            --text-white: #ffffff;
            --border: #e9ecef;
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-hover: 0 12px 40px rgba(0,0,0,0.12);
            --radius: 16px;
            --radius-sm: 8px;
            --radius-lg: 24px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --container: 1200px;
        }
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        .container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
        @media (max-width:768px) { .container { padding: 0 16px; } }

        /* ===== 导航 ===== */
        .header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(255,255,255,0.97);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 20px rgba(0,0,0,0.04);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 24px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.5px;
        }
        .logo:hover { color: var(--primary); }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 20px;
            font-weight: 800;
        }
        .nav-main {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-main a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 15px;
            color: var(--text);
            transition: var(--transition);
            position: relative;
        }
        .nav-main a::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 3px;
            background: var(--primary);
            border-radius: 4px;
            transition: var(--transition);
        }
        .nav-main a:hover { color: var(--primary); background: rgba(231,76,60,0.06); }
        .nav-main a:hover::after { width: 60%; }
        .nav-main a.active { color: var(--primary); background: rgba(231,76,60,0.08); }
        .nav-main a.active::after { width: 60%; }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .nav-search {
            display: flex;
            align-items: center;
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: 50px;
            padding: 0 16px;
            transition: var(--transition);
        }
        .nav-search:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(231,76,60,0.15);
        }
        .nav-search input {
            border: none;
            background: transparent;
            padding: 8px 12px;
            font-size: 14px;
            outline: none;
            width: 160px;
            color: var(--text);
        }
        .nav-search button {
            border: none;
            background: transparent;
            color: var(--text-light);
            cursor: pointer;
            padding: 8px 4px;
            transition: var(--transition);
        }
        .nav-search button:hover { color: var(--primary); }
        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 10px 24px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 14px;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 16px rgba(231,76,60,0.3);
        }
        .btn-cta:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(231,76,60,0.4); color: #fff; }
        .btn-cta i { font-size: 16px; }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--text);
            cursor: pointer;
            padding: 8px;
        }
        @media (max-width: 992px) {
            .nav-main { display: none; }
            .nav-search { display: none; }
            .btn-cta { display: none; }
            .nav-toggle { display: block; }
            .header .container { height: 64px; }
            .nav-main.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                padding: 16px 24px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow);
                gap: 4px;
                z-index: 1040;
            }
            .nav-main.open a { padding: 12px 16px; width: 100%; border-radius: var(--radius-sm); }
            .nav-main.open a::after { display: none; }
            .nav-main.open a.active { background: rgba(231,76,60,0.1); }
        }
        @media (max-width: 520px) {
            .logo { font-size: 18px; }
            .logo-icon { width: 34px; height: 34px; font-size: 16px; }
        }

        /* ===== 文章Banner ===== */
        .article-hero {
            position: relative;
            padding: 80px 0 60px;
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
            overflow: hidden;
            min-height: 340px;
            display: flex;
            align-items: center;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.3;
            mix-blend-mode: overlay;
        }
        .article-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(26,26,46,0.92) 0%, rgba(15,52,96,0.85) 100%);
        }
        .article-hero .container {
            position: relative;
            z-index: 2;
        }
        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255,255,255,0.7);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .article-breadcrumb a { color: rgba(255,255,255,0.7); }
        .article-breadcrumb a:hover { color: #fff; }
        .article-breadcrumb .sep { color: rgba(255,255,255,0.4); }
        .article-hero h1 {
            font-size: 42px;
            font-weight: 800;
            color: #fff;
            line-height: 1.25;
            max-width: 900px;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px 24px;
            color: rgba(255,255,255,0.8);
            font-size: 15px;
        }
        .article-meta .badge-cat {
            display: inline-block;
            padding: 4px 16px;
            background: var(--primary);
            color: #fff;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
        }
        .article-meta i { margin-right: 6px; opacity: 0.7; }
        @media (max-width: 768px) {
            .article-hero { padding: 60px 0 40px; min-height: 260px; }
            .article-hero h1 { font-size: 28px; }
            .article-meta { font-size: 13px; gap: 12px; }
        }
        @media (max-width: 520px) {
            .article-hero h1 { font-size: 22px; }
            .article-hero { padding: 48px 0 32px; min-height: 220px; }
        }

        /* ===== 文章主体 ===== */
        .article-main {
            padding: 48px 0 60px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 360px;
            gap: 40px;
        }
        .article-content {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 40px;
            box-shadow: var(--shadow);
        }
        .article-content .content-body {
            font-size: 16px;
            line-height: 1.9;
            color: var(--text);
        }
        .article-content .content-body p {
            margin-bottom: 20px;
        }
        .article-content .content-body h2,
        .article-content .content-body h3,
        .article-content .content-body h4 {
            margin-top: 32px;
            margin-bottom: 16px;
            font-weight: 700;
            color: var(--text);
        }
        .article-content .content-body h2 { font-size: 26px; }
        .article-content .content-body h3 { font-size: 22px; }
        .article-content .content-body h4 { font-size: 18px; }
        .article-content .content-body ul,
        .article-content .content-body ol {
            margin-bottom: 20px;
            padding-left: 24px;
        }
        .article-content .content-body li { margin-bottom: 8px; }
        .article-content .content-body img {
            border-radius: var(--radius-sm);
            margin: 24px 0;
            box-shadow: var(--shadow);
        }
        .article-content .content-body blockquote {
            border-left: 4px solid var(--primary);
            padding: 16px 24px;
            margin: 24px 0;
            background: rgba(231,76,60,0.04);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-style: italic;
            color: var(--text-light);
        }
        .article-content .content-body a { color: var(--primary); text-decoration: underline; }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
        }
        .article-tags .tag {
            display: inline-block;
            padding: 6px 16px;
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: 50px;
            font-size: 13px;
            color: var(--text-light);
            transition: var(--transition);
        }
        .article-tags .tag:hover { border-color: var(--primary); color: var(--primary); background: rgba(231,76,60,0.04); }
        .article-share {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 24px;
            padding-top: 20px;
            border-top: 1px solid var(--border);
        }
        .article-share span { font-size: 14px; color: var(--text-light); font-weight: 600; }
        .article-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--bg);
            color: var(--text-light);
            transition: var(--transition);
            border: 1px solid var(--border);
        }
        .article-share a:hover { background: var(--primary); color: #fff; border-color: var(--primary); transform: translateY(-2px); }
        .article-nav {
            display: flex;
            justify-content: space-between;
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
            gap: 16px;
        }
        .article-nav a {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            padding: 12px 20px;
            border-radius: var(--radius-sm);
            background: var(--bg);
            border: 1px solid var(--border);
            transition: var(--transition);
            max-width: 48%;
        }
        .article-nav a:hover { border-color: var(--primary); color: var(--primary); background: rgba(231,76,60,0.04); }
        .article-nav .next { text-align: right; }

        /* ===== 侧边栏 ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px;
            box-shadow: var(--shadow);
        }
        .sidebar-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-card h3 i { color: var(--primary); }
        .sidebar-list {
            list-style: none;
            padding: 0;
        }
        .sidebar-list li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border);
        }
        .sidebar-list li:last-child { border-bottom: none; }
        .sidebar-list a {
            display: flex;
            gap: 12px;
            align-items: flex-start;
            color: var(--text);
            font-size: 14px;
            line-height: 1.5;
        }
        .sidebar-list a:hover { color: var(--primary); }
        .sidebar-list .thumb {
            width: 72px;
            height: 54px;
            border-radius: 6px;
            object-fit: cover;
            flex-shrink: 0;
            background: var(--border);
        }
        .sidebar-list .info { flex: 1; }
        .sidebar-list .info .title { font-weight: 600; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .sidebar-list .info .date { font-size: 12px; color: var(--text-light); margin-top: 4px; }
        .sidebar-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .sidebar-tags a {
            padding: 4px 12px;
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: 50px;
            font-size: 13px;
            color: var(--text-light);
            transition: var(--transition);
        }
        .sidebar-tags a:hover { border-color: var(--primary); color: var(--primary); background: rgba(231,76,60,0.04); }

        @media (max-width: 992px) {
            .article-layout { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
        }
        @media (max-width: 768px) {
            .article-content { padding: 24px; }
            .article-sidebar { grid-template-columns: 1fr; }
            .article-nav { flex-direction: column; }
            .article-nav a { max-width: 100%; }
        }
        @media (max-width: 520px) {
            .article-content { padding: 16px; border-radius: var(--radius-sm); }
            .article-content .content-body { font-size: 15px; }
        }

        /* ===== 相关推荐 ===== */
        .related-section {
            padding: 60px 0;
            background: var(--bg-card);
            border-top: 1px solid var(--border);
        }
        .related-section .section-title {
            font-size: 28px;
            font-weight: 800;
            margin-bottom: 8px;
            text-align: center;
        }
        .related-section .section-sub {
            text-align: center;
            color: var(--text-light);
            margin-bottom: 36px;
            font-size: 16px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: transparent; }
        .related-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: var(--border);
        }
        .related-card .card-body {
            padding: 20px;
        }
        .related-card .card-body h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body p {
            font-size: 14px;
            color: var(--text-light);
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 12px;
        }
        .related-card .card-body .meta {
            font-size: 12px;
            color: var(--text-light);
        }
        @media (max-width: 992px) {
            .related-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .related-grid { grid-template-columns: 1fr; }
            .related-section { padding: 40px 0; }
            .related-section .section-title { font-size: 22px; }
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 34px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 17px;
            color: rgba(255,255,255,0.8);
            max-width: 640px;
            margin: 0 auto 32px;
        }
        .cta-section .btn-group {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .cta-section .btn-cta-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--primary);
            color: #fff;
            padding: 16px 36px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 16px;
            transition: var(--transition);
            box-shadow: 0 8px 32px rgba(231,76,60,0.4);
        }
        .cta-section .btn-cta-primary:hover { background: var(--primary-dark); transform: translateY(-3px); box-shadow: 0 12px 40px rgba(231,76,60,0.5); color: #fff; }
        .cta-section .btn-cta-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: transparent;
            color: #fff;
            padding: 16px 36px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 16px;
            border: 2px solid rgba(255,255,255,0.3);
            transition: var(--transition);
        }
        .cta-section .btn-cta-secondary:hover { border-color: #fff; background: rgba(255,255,255,0.1); color: #fff; transform: translateY(-3px); }
        @media (max-width: 768px) {
            .cta-section { padding: 60px 0; }
            .cta-section h2 { font-size: 26px; }
            .cta-section p { font-size: 15px; }
        }
        @media (max-width: 520px) {
            .cta-section h2 { font-size: 22px; }
            .cta-section .btn-cta-primary,
            .cta-section .btn-cta-secondary { padding: 14px 24px; font-size: 14px; width: 100%; justify-content: center; }
        }

        /* ===== 页脚 ===== */
        .footer {
            background: #0d0d1a;
            color: rgba(255,255,255,0.8);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo { color: #fff; margin-bottom: 16px; }
        .footer-brand p { font-size: 14px; line-height: 1.8; color: rgba(255,255,255,0.6); margin-bottom: 20px; max-width: 360px; }
        .footer-social { display: flex; gap: 12px; }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.06);
            color: rgba(255,255,255,0.6);
            transition: var(--transition);
            font-size: 18px;
        }
        .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-3px); }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 32px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
        }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.55);
            font-size: 14px;
            padding: 6px 0;
            transition: var(--transition);
        }
        .footer-col a:hover { color: var(--primary); padding-left: 4px; }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--primary); }
        @media (max-width: 992px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-brand { grid-column: 1 / -1; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .footer { padding: 40px 0 0; }
        }

        /* ===== 通用工具 ===== */
        .text-center { text-align: center; }
        .mt-2 { margin-top: 16px; }
        .mb-2 { margin-bottom: 16px; }
        .not-found {
            text-align: center;
            padding: 80px 24px;
        }
        .not-found h2 { font-size: 28px; margin-bottom: 16px; color: var(--text); }
        .not-found p { color: var(--text-light); margin-bottom: 24px; }
        .not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition);
        }
        .not-found .btn-back:hover { background: var(--primary-dark); color: #fff; transform: translateY(-2px); }