/* roulang page: index */
:root {
        --primary: #0f172a;
        --primary-light: #1e3a5f;
        --primary-dark: #070c16;
        --accent: #eab308;
        --accent-hover: #ca8a04;
        --accent-light: #fef9c3;
        --bg-light: #f8fafc;
        --bg-white: #ffffff;
        --bg-dark: #0f172a;
        --text-dark: #0f172a;
        --text-muted: #64748b;
        --text-light: #f1f5f9;
        --border-color: #e2e8f0;
        --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
        --shadow: 0 4px 24px rgba(0,0,0,0.06);
        --shadow-hover: 0 8px 40px rgba(0,0,0,0.12);
        --shadow-lg: 0 20px 60px rgba(0,0,0,0.15);
        --radius: 12px;
        --radius-sm: 8px;
        --radius-lg: 20px;
        --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        --font-base: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    }

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

    html {
        scroll-behavior: smooth;
    }

    body {
        font-family: var(--font-base);
        color: var(--text-dark);
        background: var(--bg-light);
        line-height: 1.7;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        padding-bottom: 70px;
    }
    @media (min-width: 992px) {
        body {
            padding-bottom: 0;
        }
    }

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

    img {
        max-width: 100%;
        height: auto;
        vertical-align: middle;
    }

    .container {
        max-width: 1200px;
        padding-left: 20px;
        padding-right: 20px;
    }

    .section-title {
        font-size: 2rem;
        font-weight: 700;
        text-align: center;
        margin-bottom: 0.75rem;
        color: var(--text-dark);
        letter-spacing: -0.02em;
    }
    .section-subtitle {
        font-size: 1.05rem;
        color: var(--text-muted);
        text-align: center;
        max-width: 700px;
        margin: 0 auto 3rem auto;
        line-height: 1.8;
    }
    @media (max-width: 768px) {
        .section-title {
            font-size: 1.6rem;
        }
        .section-subtitle {
            font-size: 0.95rem;
            margin-bottom: 2rem;
        }
    }

    .btn-accent {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        background: var(--accent);
        color: var(--primary-dark);
        border: none;
        padding: 12px 32px;
        font-size: 1rem;
        font-weight: 600;
        border-radius: 50px;
        transition: all var(--transition);
        box-shadow: 0 4px 16px rgba(234, 179, 8, 0.35);
    }
    .btn-accent:hover {
        background: var(--accent-hover);
        color: var(--primary-dark);
        transform: translateY(-2px);
        box-shadow: 0 8px 28px rgba(234, 179, 8, 0.45);
    }
    .btn-accent:focus {
        outline: 3px solid rgba(234, 179, 8, 0.4);
        outline-offset: 2px;
    }

    .btn-outline-accent {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        background: transparent;
        color: var(--accent);
        border: 2px solid var(--accent);
        padding: 10px 28px;
        font-size: 1rem;
        font-weight: 600;
        border-radius: 50px;
        transition: all var(--transition);
    }
    .btn-outline-accent:hover {
        background: var(--accent);
        color: var(--primary-dark);
        transform: translateY(-2px);
    }
    .btn-outline-accent:focus {
        outline: 3px solid rgba(234, 179, 8, 0.3);
        outline-offset: 2px;
    }

    .badge-accent {
        background: var(--accent-light);
        color: var(--primary-light);
        font-weight: 600;
        padding: 6px 16px;
        border-radius: 50px;
        font-size: 0.85rem;
        display: inline-block;
    }

    .card-custom {
        background: var(--bg-white);
        border: 1px solid var(--border-color);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        transition: all var(--transition);
        overflow: hidden;
    }
    .card-custom:hover {
        box-shadow: var(--shadow-hover);
        transform: translateY(-4px);
    }

    /* ===== 导航栏 ===== */
    .top-nav {
        background: var(--primary);
        padding: 0;
        box-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
        position: relative;
        z-index: 1050;
    }
    .top-nav .navbar-brand {
        color: #fff;
        font-weight: 700;
        font-size: 1.25rem;
        letter-spacing: -0.01em;
        padding: 14px 0;
        display: flex;
        align-items: center;
        gap: 10px;
    }
    .top-nav .navbar-brand:hover {
        color: var(--accent);
    }
    .top-nav .navbar-brand .brand-icon {
        width: 36px;
        height: 36px;
        background: var(--accent);
        border-radius: 8px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--primary-dark);
        font-weight: 700;
        font-size: 1.1rem;
    }
    .top-nav .nav-link {
        color: rgba(255, 255, 255, 0.8);
        font-weight: 500;
        padding: 18px 20px !important;
        transition: all var(--transition);
        position: relative;
        font-size: 0.95rem;
    }
    .top-nav .nav-link:hover,
    .top-nav .nav-link.active {
        color: var(--accent);
    }
    .top-nav .nav-link.active::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 20px;
        right: 20px;
        height: 3px;
        background: var(--accent);
        border-radius: 3px 3px 0 0;
    }
    .top-nav .navbar-toggler {
        border: none;
        color: #fff;
        font-size: 1.4rem;
        padding: 8px;
    }
    .top-nav .navbar-toggler:focus {
        box-shadow: none;
    }

    /* ===== 底部Tab导航 (移动端) ===== */
    .bottom-tab-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--bg-white);
        border-top: 1px solid var(--border-color);
        display: flex;
        align-items: center;
        justify-content: space-around;
        padding: 6px 0 env(safe-area-inset-bottom, 6px) 0;
        z-index: 1050;
        box-shadow: 0 -2px 16px rgba(0, 0, 0, 0.06);
    }
    .bottom-tab-nav .tab-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 2px;
        padding: 6px 12px;
        border-radius: var(--radius-sm);
        color: var(--text-muted);
        font-size: 0.7rem;
        font-weight: 500;
        transition: all var(--transition);
        text-decoration: none;
        min-width: 60px;
    }
    .bottom-tab-nav .tab-item i {
        font-size: 1.3rem;
        transition: color var(--transition);
    }
    .bottom-tab-nav .tab-item span {
        font-size: 0.65rem;
        line-height: 1.2;
    }
    .bottom-tab-nav .tab-item:hover,
    .bottom-tab-nav .tab-item.active {
        color: var(--accent);
    }
    .bottom-tab-nav .tab-item.active i {
        color: var(--accent);
    }
    @media (min-width: 992px) {
        .bottom-tab-nav {
            display: none !important;
        }
    }

    /* ===== Hero ===== */
    .hero-section {
        position: relative;
        min-height: 80vh;
        display: flex;
        align-items: center;
        justify-content: center;
        background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
        overflow: hidden;
        padding: 80px 0 100px;
    }
    .hero-section::before {
        content: '';
        position: absolute;
        inset: 0;
        background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
        opacity: 0.25;
        mix-blend-mode: overlay;
        z-index: 0;
    }
    .hero-section::after {
        content: '';
        position: absolute;
        inset: 0;
        background: radial-gradient(ellipse at center 40%, transparent 0%, rgba(15, 23, 42, 0.7) 100%);
        z-index: 1;
    }
    .hero-content {
        position: relative;
        z-index: 2;
        text-align: center;
        max-width: 880px;
        padding: 0 20px;
    }
    .hero-content .hero-badge {
        display: inline-block;
        background: rgba(234, 179, 8, 0.15);
        color: var(--accent);
        padding: 6px 24px;
        border-radius: 50px;
        font-size: 0.9rem;
        font-weight: 600;
        margin-bottom: 20px;
        border: 1px solid rgba(234, 179, 8, 0.25);
        backdrop-filter: blur(4px);
    }
    .hero-content h1 {
        font-size: 3.2rem;
        font-weight: 800;
        color: #fff;
        line-height: 1.2;
        margin-bottom: 20px;
        letter-spacing: -0.02em;
        text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
    }
    .hero-content h1 .highlight {
        color: var(--accent);
    }
    .hero-content p {
        font-size: 1.2rem;
        color: rgba(255, 255, 255, 0.85);
        max-width: 700px;
        margin: 0 auto 36px;
        line-height: 1.8;
        text-shadow: 0 1px 8px rgba(0, 0, 0, 0.2);
    }
    .hero-content .hero-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 16px;
        justify-content: center;
    }
    .hero-content .hero-actions .btn-accent {
        padding: 16px 44px;
        font-size: 1.1rem;
    }
    .hero-content .hero-stats {
        display: flex;
        flex-wrap: wrap;
        gap: 32px;
        justify-content: center;
        margin-top: 48px;
        padding-top: 36px;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    .hero-content .hero-stats .stat-item {
        text-align: center;
    }
    .hero-content .hero-stats .stat-number {
        font-size: 2rem;
        font-weight: 800;
        color: var(--accent);
        line-height: 1.2;
    }
    .hero-content .hero-stats .stat-label {
        font-size: 0.85rem;
        color: rgba(255, 255, 255, 0.6);
        margin-top: 2px;
    }
    @media (max-width: 768px) {
        .hero-section {
            min-height: 70vh;
            padding: 60px 0 70px;
        }
        .hero-content h1 {
            font-size: 2rem;
        }
        .hero-content p {
            font-size: 1rem;
        }
        .hero-content .hero-stats {
            gap: 20px;
            margin-top: 32px;
            padding-top: 24px;
        }
        .hero-content .hero-stats .stat-number {
            font-size: 1.5rem;
        }
    }
    @media (max-width: 520px) {
        .hero-content h1 {
            font-size: 1.7rem;
        }
        .hero-content .hero-actions .btn-accent {
            padding: 14px 32px;
            font-size: 1rem;
            width: 100%;
        }
    }

    /* ===== 核心优势 ===== */
    .features-section {
        padding: 80px 0;
        background: var(--bg-white);
    }
    .features-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
    }
    .feature-card {
        background: var(--bg-light);
        border-radius: var(--radius);
        padding: 36px 28px;
        text-align: center;
        transition: all var(--transition);
        border: 1px solid var(--border-color);
    }
    .feature-card:hover {
        border-color: var(--accent);
        box-shadow: var(--shadow-hover);
        transform: translateY(-6px);
    }
    .feature-card .f-icon {
        width: 64px;
        height: 64px;
        border-radius: 16px;
        background: var(--accent-light);
        color: var(--primary-light);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.8rem;
        margin: 0 auto 20px;
        transition: all var(--transition);
    }
    .feature-card:hover .f-icon {
        background: var(--accent);
        color: var(--primary-dark);
    }
    .feature-card h3 {
        font-size: 1.2rem;
        font-weight: 700;
        margin-bottom: 12px;
    }
    .feature-card p {
        font-size: 0.92rem;
        color: var(--text-muted);
        line-height: 1.7;
        margin: 0;
    }
    @media (max-width: 992px) {
        .features-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }
    @media (max-width: 640px) {
        .features-grid {
            grid-template-columns: 1fr;
        }
        .features-section {
            padding: 50px 0;
        }
    }

    /* ===== 平台特色 ===== */
    .platform-section {
        padding: 80px 0;
        background: var(--bg-light);
    }
    .platform-wrap {
        display: flex;
        align-items: center;
        gap: 50px;
        background: var(--bg-white);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow);
        overflow: hidden;
        border: 1px solid var(--border-color);
    }
    .platform-wrap .platform-img {
        flex: 0 0 48%;
        min-height: 340px;
        background: url('/assets/images/coverpic/cover-1.png') center center / cover no-repeat;
        background-color: var(--primary-light);
    }
    .platform-wrap .platform-text {
        flex: 1;
        padding: 50px 50px 50px 0;
    }
    .platform-wrap .platform-text .badge-accent {
        margin-bottom: 12px;
    }
    .platform-wrap .platform-text h2 {
        font-size: 1.8rem;
        font-weight: 700;
        margin-bottom: 16px;
        line-height: 1.3;
    }
    .platform-wrap .platform-text p {
        color: var(--text-muted);
        font-size: 1rem;
        line-height: 1.8;
        margin-bottom: 20px;
    }
    .platform-wrap .platform-text .feature-list {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 10px 20px;
        list-style: none;
        padding: 0;
        margin: 0;
    }
    .platform-wrap .platform-text .feature-list li {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 0.92rem;
        color: var(--text-dark);
    }
    .platform-wrap .platform-text .feature-list li i {
        color: var(--accent);
        font-size: 0.85rem;
        width: 20px;
        text-align: center;
    }
    @media (max-width: 992px) {
        .platform-wrap {
            flex-direction: column;
        }
        .platform-wrap .platform-img {
            flex: 0 0 240px;
            width: 100%;
            min-height: 240px;
        }
        .platform-wrap .platform-text {
            padding: 30px 28px;
        }
        .platform-wrap .platform-text h2 {
            font-size: 1.5rem;
        }
    }
    @media (max-width: 640px) {
        .platform-wrap .platform-text .feature-list {
            grid-template-columns: 1fr;
        }
        .platform-section {
            padding: 50px 0;
        }
    }

    /* ===== 数据统计 ===== */
    .stats-section {
        padding: 60px 0;
        background: var(--primary);
        position: relative;
        overflow: hidden;
    }
    .stats-section::before {
        content: '';
        position: absolute;
        inset: 0;
        background: url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
        opacity: 0.08;
        mix-blend-mode: overlay;
    }
    .stats-grid {
        position: relative;
        z-index: 1;
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 28px;
        text-align: center;
    }
    .stats-grid .s-item {
        padding: 20px 10px;
    }
    .stats-grid .s-number {
        font-size: 2.6rem;
        font-weight: 800;
        color: var(--accent);
        line-height: 1.2;
    }
    .stats-grid .s-label {
        font-size: 0.95rem;
        color: rgba(255, 255, 255, 0.7);
        margin-top: 6px;
    }
    @media (max-width: 768px) {
        .stats-grid {
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .stats-grid .s-number {
            font-size: 2rem;
        }
    }
    @media (max-width: 520px) {
        .stats-grid {
            grid-template-columns: repeat(2, 1fr);
            gap: 12px;
        }
        .stats-grid .s-number {
            font-size: 1.6rem;
        }
    }

    /* ===== 最新资讯 ===== */
    .news-section {
        padding: 80px 0;
        background: var(--bg-white);
    }
    .news-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
    }
    .news-card {
        border-radius: var(--radius);
        overflow: hidden;
        background: var(--bg-white);
        border: 1px solid var(--border-color);
        box-shadow: var(--shadow-sm);
        transition: all var(--transition);
    }
    .news-card:hover {
        box-shadow: var(--shadow-hover);
        transform: translateY(-4px);
    }
    .news-card .card-img {
        height: 200px;
        background: var(--primary-light);
        background-size: cover;
        background-position: center;
        background-repeat: no-repeat;
        position: relative;
    }
    .news-card .card-img .card-cat {
        position: absolute;
        top: 12px;
        left: 12px;
        background: var(--accent);
        color: var(--primary-dark);
        font-size: 0.75rem;
        font-weight: 600;
        padding: 4px 14px;
        border-radius: 50px;
    }
    .news-card .card-body {
        padding: 20px 22px 24px;
    }
    .news-card .card-body .card-date {
        font-size: 0.8rem;
        color: var(--text-muted);
        margin-bottom: 8px;
    }
    .news-card .card-body h3 {
        font-size: 1.05rem;
        font-weight: 700;
        line-height: 1.4;
        margin-bottom: 10px;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .news-card .card-body h3 a {
        color: var(--text-dark);
    }
    .news-card .card-body h3 a:hover {
        color: var(--primary-light);
    }
    .news-card .card-body p {
        font-size: 0.88rem;
        color: var(--text-muted);
        line-height: 1.7;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        margin: 0;
    }
    .news-empty {
        grid-column: 1 / -1;
        text-align: center;
        padding: 60px 20px;
        color: var(--text-muted);
        background: var(--bg-light);
        border-radius: var(--radius);
        border: 1px dashed var(--border-color);
    }
    .news-empty i {
        font-size: 3rem;
        color: var(--border-color);
        margin-bottom: 16px;
        display: block;
    }
    @media (max-width: 992px) {
        .news-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }
    @media (max-width: 640px) {
        .news-grid {
            grid-template-columns: 1fr;
        }
        .news-section {
            padding: 50px 0;
        }
    }

    /* ===== 使用流程 ===== */
    .process-section {
        padding: 80px 0;
        background: var(--bg-light);
    }
    .process-steps {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
        position: relative;
    }
    .process-steps::before {
        content: '';
        position: absolute;
        top: 48px;
        left: 10%;
        right: 10%;
        height: 2px;
        background: linear-gradient(to right, var(--accent), var(--accent));
        opacity: 0.3;
        z-index: 0;
    }
    .process-step {
        text-align: center;
        position: relative;
        z-index: 1;
        background: var(--bg-white);
        border-radius: var(--radius);
        padding: 32px 20px 28px;
        border: 1px solid var(--border-color);
        transition: all var(--transition);
    }
    .process-step:hover {
        box-shadow: var(--shadow);
        border-color: var(--accent);
    }
    .process-step .step-num {
        width: 56px;
        height: 56px;
        border-radius: 50%;
        background: var(--accent);
        color: var(--primary-dark);
        font-weight: 800;
        font-size: 1.3rem;
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 18px;
        box-shadow: 0 4px 16px rgba(234, 179, 8, 0.3);
    }
    .process-step h4 {
        font-size: 1.05rem;
        font-weight: 700;
        margin-bottom: 10px;
    }
    .process-step p {
        font-size: 0.88rem;
        color: var(--text-muted);
        line-height: 1.7;
        margin: 0;
    }
    @media (max-width: 992px) {
        .process-steps {
            grid-template-columns: repeat(2, 1fr);
        }
        .process-steps::before {
            display: none;
        }
    }
    @media (max-width: 640px) {
        .process-steps {
            grid-template-columns: 1fr;
        }
        .process-section {
            padding: 50px 0;
        }
    }

    /* ===== FAQ ===== */
    .faq-section {
        padding: 80px 0;
        background: var(--bg-white);
    }
    .faq-list {
        max-width: 800px;
        margin: 0 auto;
    }
    .faq-item {
        border: 1px solid var(--border-color);
        border-radius: var(--radius);
        margin-bottom: 16px;
        overflow: hidden;
        transition: all var(--transition);
    }
    .faq-item:hover {
        border-color: var(--accent);
        box-shadow: var(--shadow-sm);
    }
    .faq-item .faq-question {
        background: var(--bg-light);
        padding: 18px 24px;
        font-weight: 600;
        font-size: 1rem;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        transition: background var(--transition);
        border: none;
        width: 100%;
        text-align: left;
        color: var(--text-dark);
    }
    .faq-item .faq-question:hover {
        background: var(--accent-light);
    }
    .faq-item .faq-question i {
        color: var(--accent);
        transition: transform var(--transition);
        flex-shrink: 0;
    }
    .faq-item .faq-question[aria-expanded="true"] i {
        transform: rotate(180deg);
    }
    .faq-item .faq-answer {
        padding: 0 24px 20px;
        color: var(--text-muted);
        font-size: 0.95rem;
        line-height: 1.8;
    }
    @media (max-width: 640px) {
        .faq-section {
            padding: 50px 0;
        }
        .faq-item .faq-question {
            padding: 14px 18px;
            font-size: 0.92rem;
        }
        .faq-item .faq-answer {
            padding: 0 18px 16px;
            font-size: 0.88rem;
        }
    }

    /* ===== CTA ===== */
    .cta-section {
        padding: 80px 0;
        background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
        position: relative;
        overflow: hidden;
    }
    .cta-section::before {
        content: '';
        position: absolute;
        inset: 0;
        background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
        opacity: 0.06;
        mix-blend-mode: overlay;
    }
    .cta-content {
        position: relative;
        z-index: 1;
        text-align: center;
        max-width: 700px;
        margin: 0 auto;
    }
    .cta-content h2 {
        font-size: 2.2rem;
        font-weight: 700;
        color: #fff;
        margin-bottom: 16px;
    }
    .cta-content p {
        font-size: 1.1rem;
        color: rgba(255, 255, 255, 0.8);
        margin-bottom: 32px;
        line-height: 1.8;
    }
    .cta-content .btn-accent {
        padding: 16px 48px;
        font-size: 1.1rem;
    }
    @media (max-width: 768px) {
        .cta-content h2 {
            font-size: 1.6rem;
        }
        .cta-content p {
            font-size: 0.95rem;
        }
        .cta-section {
            padding: 50px 0;
        }
    }

    /* ===== 页脚 ===== */
    .site-footer {
        background: var(--primary-dark);
        padding: 50px 0 30px;
        color: rgba(255, 255, 255, 0.7);
    }
    .site-footer .footer-brand {
        font-size: 1.2rem;
        font-weight: 700;
        color: #fff;
        margin-bottom: 8px;
        display: flex;
        align-items: center;
        gap: 10px;
    }
    .site-footer .footer-brand .brand-icon {
        width: 32px;
        height: 32px;
        background: var(--accent);
        border-radius: 6px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--primary-dark);
        font-weight: 700;
        font-size: 0.9rem;
    }
    .site-footer p {
        font-size: 0.9rem;
        line-height: 1.7;
        max-width: 360px;
    }
    .site-footer .footer-links {
        list-style: none;
        padding: 0;
        margin: 0;
    }
    .site-footer .footer-links li {
        margin-bottom: 8px;
    }
    .site-footer .footer-links a {
        color: rgba(255, 255, 255, 0.6);
        font-size: 0.9rem;
        transition: color var(--transition);
    }
    .site-footer .footer-links a:hover {
        color: var(--accent);
    }
    .site-footer .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, 0.08);
        padding-top: 24px;
        margin-top: 36px;
        text-align: center;
        font-size: 0.85rem;
        color: rgba(255, 255, 255, 0.4);
    }
    @media (max-width: 768px) {
        .site-footer {
            padding: 36px 0 80px;
        }
        .site-footer .row>div {
            margin-bottom: 28px;
        }
    }

    /* ===== 通用响应式 ===== */
    @media (max-width: 576px) {
        .container {
            padding-left: 16px;
            padding-right: 16px;
        }
        h1 {
            font-size: 1.8rem !important;
        }
        h2 {
            font-size: 1.4rem !important;
        }
        .btn-accent,
        .btn-outline-accent {
            padding: 10px 24px;
            font-size: 0.92rem;
        }
    }

    /* 焦点可访问性 */
    :focus-visible {
        outline: 3px solid var(--accent);
        outline-offset: 2px;
    }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a2a6c;
            --primary-dark: #0f1a4a;
            --primary-light: #2d4a9e;
            --secondary: #e8491d;
            --secondary-light: #ff6b3d;
            --accent: #f5a623;
            --bg-light: #f8f9fc;
            --bg-dark: #0d1117;
            --bg-card: #ffffff;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-muted: #8a8aaa;
            --text-white: #ffffff;
            --border-light: #e8ecf4;
            --border-accent: #d4d8e8;
            --shadow-sm: 0 2px 8px rgba(26, 42, 108, 0.06);
            --shadow-md: 0 6px 24px rgba(26, 42, 108, 0.10);
            --shadow-lg: 0 12px 48px rgba(26, 42, 108, 0.14);
            --shadow-hover: 0 16px 48px rgba(26, 42, 108, 0.18);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-xl: 30px;
            --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 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-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-light);
            padding-top: var(--header-height);
            overflow-x: hidden;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            list-style: none;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }
        .container-narrow {
            max-width: 800px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* ===== 顶部导航 (桌面) ===== */
        .top-nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: var(--header-height);
            display: flex;
            align-items: center;
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
        }
        .top-nav .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.3px;
            text-decoration: none;
        }
        .navbar-brand:hover {
            color: var(--primary-dark);
        }
        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 800;
            font-size: 1.2rem;
            box-shadow: 0 2px 8px rgba(26, 42, 108, 0.2);
        }
        .navbar-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .navbar-nav .nav-item .nav-link {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .navbar-nav .nav-item .nav-link:hover {
            color: var(--primary);
            background: rgba(26, 42, 108, 0.06);
        }
        .navbar-nav .nav-item .nav-link.active {
            color: var(--primary);
            background: rgba(26, 42, 108, 0.08);
            font-weight: 600;
        }
        .navbar-nav .nav-item .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--secondary);
            border-radius: 4px;
        }

        /* ===== 移动端底部 Tab 导航 ===== */
        .bottom-tab-nav {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1060;
            background: rgba(255, 255, 255, 0.97);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-top: 1px solid var(--border-light);
            padding: 6px 0 env(safe-area-inset-bottom, 6px) 0;
            box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.06);
        }
        .bottom-tab-nav .tab-list {
            display: flex;
            align-items: stretch;
            justify-content: space-around;
            max-width: 500px;
            margin: 0 auto;
            padding: 0 8px;
        }
        .bottom-tab-nav .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 4px 8px;
            border-radius: var(--radius-sm);
            color: var(--text-muted);
            font-size: 0.7rem;
            font-weight: 500;
            text-decoration: none;
            transition: var(--transition);
            flex: 1;
            min-width: 0;
            gap: 2px;
        }
        .bottom-tab-nav .tab-item i {
            font-size: 1.35rem;
            margin-bottom: 0;
            transition: var(--transition);
        }
        .bottom-tab-nav .tab-item span {
            font-size: 0.6rem;
            line-height: 1.2;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 100%;
        }
        .bottom-tab-nav .tab-item:hover {
            color: var(--primary-light);
            background: rgba(26, 42, 108, 0.05);
        }
        .bottom-tab-nav .tab-item.active {
            color: var(--primary);
            font-weight: 600;
        }
        .bottom-tab-nav .tab-item.active i {
            color: var(--secondary);
        }

        /* ===== Banner ===== */
        .article-banner {
            position: relative;
            padding: 60px 0 50px;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
            overflow: hidden;
            min-height: 240px;
            display: flex;
            align-items: center;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: overlay;
        }
        .article-banner .container-narrow {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .article-banner .breadcrumb {
            display: flex;
            justify-content: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .article-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }
        .article-banner .breadcrumb a:hover {
            color: #fff;
        }
        .article-banner .breadcrumb .separator {
            color: rgba(255, 255, 255, 0.3);
        }
        .article-banner h1 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.3;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }
        .article-banner .meta-line {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 20px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
        }
        .article-banner .meta-line i {
            margin-right: 6px;
        }

        /* ===== 文章正文区 ===== */
        .article-main {
            padding: 50px 0 60px;
        }
        .article-body {
            background: #fff;
            border-radius: var(--radius-md);
            padding: 40px 48px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
        }
        .article-body h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 32px 0 16px;
            padding-bottom: 8px;
            border-bottom: 2px solid var(--border-light);
        }
        .article-body h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--text-primary);
            margin: 24px 0 12px;
        }
        .article-body p {
            margin-bottom: 18px;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        .article-body ul,
        .article-body ol {
            margin: 16px 0 20px;
            padding-left: 24px;
        }
        .article-body li {
            margin-bottom: 8px;
            color: var(--text-secondary);
            line-height: 1.7;
            list-style: disc;
        }
        .article-body img {
            border-radius: var(--radius-sm);
            margin: 24px auto;
            box-shadow: var(--shadow-sm);
        }
        .article-body blockquote {
            margin: 24px 0;
            padding: 18px 24px;
            background: var(--bg-light);
            border-left: 4px solid var(--secondary);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body a {
            color: var(--secondary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-body a:hover {
            color: var(--secondary-light);
        }

        .article-not-found {
            text-align: center;
            padding: 60px 20px;
            background: #fff;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
        }
        .article-not-found i {
            font-size: 3rem;
            color: var(--text-muted);
            margin-bottom: 16px;
        }
        .article-not-found h3 {
            font-size: 1.4rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .article-not-found p {
            color: var(--text-secondary);
            margin-bottom: 20px;
        }
        .article-not-found .btn-home {
            display: inline-block;
            padding: 12px 32px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: var(--transition);
        }
        .article-not-found .btn-home:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* ===== 推荐文章 ===== */
        .related-section {
            padding: 40px 0 60px;
        }
        .related-section .section-title {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin-bottom: 8px;
        }
        .related-section .section-sub {
            color: var(--text-muted);
            margin-bottom: 32px;
        }
        .related-card {
            background: #fff;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--border-accent);
        }
        .related-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
        }
        .related-card .card-body {
            padding: 20px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .related-card .card-body .tag {
            display: inline-block;
            font-size: 0.7rem;
            font-weight: 600;
            color: var(--secondary);
            background: rgba(232, 73, 29, 0.08);
            padding: 2px 12px;
            border-radius: 20px;
            margin-bottom: 10px;
            align-self: flex-start;
        }
        .related-card .card-body h5 {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .related-card .card-body h5 a {
            color: inherit;
        }
        .related-card .card-body h5 a:hover {
            color: var(--primary-light);
        }
        .related-card .card-body .card-text {
            font-size: 0.88rem;
            color: var(--text-secondary);
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body .card-meta {
            font-size: 0.78rem;
            color: var(--text-muted);
            margin-top: 12px;
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }

        /* ===== FAQ 区块 ===== */
        .faq-section {
            padding: 50px 0 60px;
            background: var(--bg-light);
        }
        .faq-section .section-title {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--primary-dark);
            text-align: center;
            margin-bottom: 8px;
        }
        .faq-section .section-sub {
            text-align: center;
            color: var(--text-muted);
            margin-bottom: 36px;
        }
        .faq-item {
            background: #fff;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            padding: 20px 24px;
            margin-bottom: 14px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-md);
        }
        .faq-item .faq-question {
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            gap: 12px;
        }
        .faq-item .faq-question i {
            color: var(--secondary);
            font-size: 1.1rem;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item .faq-answer {
            margin-top: 14px;
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
            border-top: 1px solid var(--border-light);
            padding-top: 14px;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        /* ===== CTA 区块 ===== */
        .cta-section {
            padding: 60px 0;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
            position: relative;
            overflow: hidden;
            text-align: center;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .cta-section .btn-cta {
            display: inline-block;
            padding: 14px 44px;
            background: var(--secondary);
            color: #fff;
            font-weight: 700;
            font-size: 1.05rem;
            border-radius: var(--radius-xl);
            box-shadow: 0 4px 20px rgba(232, 73, 29, 0.35);
            transition: var(--transition);
            border: none;
            cursor: pointer;
            text-decoration: none;
        }
        .cta-section .btn-cta:hover {
            background: var(--secondary-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(232, 73, 29, 0.45);
            color: #fff;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 48px 0 30px;
        }
        .site-footer .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }
        .site-footer .footer-brand .brand-icon {
            background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
        }
        .site-footer p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            max-width: 360px;
        }
        .site-footer h6 {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 18px;
        }
        .footer-links {
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links li a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .footer-links li a:hover {
            color: var(--secondary-light);
            padding-left: 4px;
        }
        .footer-bottom {
            margin-top: 36px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .article-banner h1 {
                font-size: 1.8rem;
            }
            .article-body {
                padding: 30px 28px;
            }
        }

        @media (max-width: 768px) {
            body {
                padding-top: 60px;
                padding-bottom: 64px;
            }
            .top-nav {
                height: 60px;
            }
            .navbar-brand {
                font-size: 1.1rem;
            }
            .brand-icon {
                width: 32px;
                height: 32px;
                font-size: 1rem;
            }
            .top-nav .navbar-nav {
                display: none !important;
            }
            .bottom-tab-nav {
                display: block;
            }
            .article-banner {
                padding: 40px 0 36px;
                min-height: 180px;
            }
            .article-banner h1 {
                font-size: 1.4rem;
            }
            .article-banner .meta-line {
                font-size: 0.8rem;
                gap: 12px;
            }
            .article-main {
                padding: 30px 0 40px;
            }
            .article-body {
                padding: 20px 18px;
                border-radius: var(--radius-sm);
            }
            .article-body h2 {
                font-size: 1.3rem;
            }
            .article-body h3 {
                font-size: 1.1rem;
            }
            .related-section .section-title {
                font-size: 1.3rem;
            }
            .related-card .card-img {
                height: 140px;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .cta-section .btn-cta {
                padding: 12px 32px;
                font-size: 0.95rem;
            }
            .faq-section .section-title {
                font-size: 1.3rem;
            }
            .faq-item {
                padding: 16px 18px;
            }
            .site-footer {
                padding: 36px 0 24px;
            }
            .site-footer .footer-brand {
                font-size: 1.15rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 14px;
            }
            .container-narrow {
                padding: 0 14px;
            }
            .article-banner h1 {
                font-size: 1.2rem;
            }
            .article-banner .meta-line {
                font-size: 0.72rem;
                gap: 8px;
            }
            .article-body {
                padding: 16px 14px;
            }
            .article-body h2 {
                font-size: 1.15rem;
            }
            .related-card .card-body {
                padding: 16px;
            }
            .related-card .card-body h5 {
                font-size: 0.95rem;
            }
            .bottom-tab-nav .tab-item i {
                font-size: 1.15rem;
            }
            .bottom-tab-nav .tab-item span {
                font-size: 0.5rem;
            }
        }

        @media (min-width: 769px) {
            .bottom-tab-nav {
                display: none !important;
            }
        }

        /* ===== 辅助 ===== */
        .text-gradient {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .mt-1 { margin-top: 8px; }
        .mt-2 { margin-top: 16px; }
        .mt-3 { margin-top: 24px; }
        .mb-1 { margin-bottom: 8px; }
        .mb-2 { margin-bottom: 16px; }
        .mb-3 { margin-bottom: 24px; }

/* roulang page: category1 */
/* ========== 设计变量 ========== */
        :root {
            --primary: #1a2a6c;
            --primary-light: #2d4a8e;
            --primary-dark: #0f1a4a;
            --secondary: #e63946;
            --secondary-light: #ff5a67;
            --accent: #f9c74f;
            --accent-light: #ffe08a;
            --bg-light: #f5f7fc;
            --bg-dark: #0d1b2a;
            --bg-card: #ffffff;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-light: #7a7a9a;
            --text-white: #ffffff;
            --border-color: #e8ecf4;
            --border-radius: 16px;
            --border-radius-sm: 10px;
            --border-radius-lg: 24px;
            --shadow-sm: 0 2px 8px rgba(26, 42, 108, 0.08);
            --shadow-md: 0 8px 30px rgba(26, 42, 108, 0.12);
            --shadow-lg: 0 20px 60px rgba(26, 42, 108, 0.18);
            --shadow-hover: 0 16px 48px rgba(230, 57, 70, 0.15);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1280px;
            --header-height: 72px;
            --footer-bg: #0d1b2a;
        }

        /* ========== 基础重置 ========== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

        body {
            font-family: var(--font-sans);
            font-size: 1rem;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-light);
            padding-top: var(--header-height);
            overflow-x: hidden;
        }

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

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

        ul,
        ol {
            padding-left: 1.25rem;
        }

        /* ========== 容器 ========== */
        .container {
            max-width: var(--container-max);
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }

        /* ========== 导航 (桌面) ========== */
        .top-nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 2px 20px rgba(26, 42, 108, 0.06);
            transition: var(--transition);
        }

        .top-nav .navbar-brand {
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0;
            letter-spacing: -0.3px;
        }
        .top-nav .navbar-brand:hover {
            color: var(--primary);
        }
        .top-nav .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            font-weight: 800;
            font-size: 1.2rem;
            box-shadow: 0 4px 12px rgba(26, 42, 108, 0.25);
        }

        .top-nav .nav-link {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-secondary);
            padding: 0.5rem 1.1rem !important;
            border-radius: var(--border-radius-sm);
            transition: var(--transition);
            position: relative;
        }
        .top-nav .nav-link::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%) scaleX(0);
            width: 60%;
            height: 3px;
            border-radius: 3px;
            background: var(--secondary);
            transition: var(--transition);
        }
        .top-nav .nav-link:hover::after,
        .top-nav .nav-link.active::after {
            transform: translateX(-50%) scaleX(1);
        }
        .top-nav .nav-link:hover {
            color: var(--primary);
            background: rgba(26, 42, 108, 0.04);
        }
        .top-nav .nav-link.active {
            color: var(--primary);
            background: rgba(26, 42, 108, 0.06);
        }

        /* ========== 移动端底部 Tab 导航 ========== */
        .bottom-tab-nav {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1060;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-top: 1px solid var(--border-color);
            display: none;
            justify-content: space-around;
            align-items: center;
            padding: 0.35rem 0.5rem;
            padding-bottom: calc(0.35rem + env(safe-area-inset-bottom, 0));
            box-shadow: 0 -4px 20px rgba(26, 42, 108, 0.06);
        }

        .bottom-tab-nav .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 0.3rem 0.6rem;
            border-radius: var(--border-radius-sm);
            color: var(--text-light);
            font-size: 0.65rem;
            font-weight: 500;
            transition: var(--transition);
            text-decoration: none;
            min-width: 64px;
            gap: 2px;
        }
        .bottom-tab-nav .tab-item i {
            font-size: 1.25rem;
            transition: var(--transition);
        }
        .bottom-tab-nav .tab-item span {
            font-size: 0.6rem;
            line-height: 1.2;
        }
        .bottom-tab-nav .tab-item:hover,
        .bottom-tab-nav .tab-item.active {
            color: var(--secondary);
        }
        .bottom-tab-nav .tab-item.active i {
            transform: scale(1.1);
        }
        .bottom-tab-nav .tab-item.active::after {
            content: '';
            position: absolute;
            top: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 32px;
            height: 3px;
            border-radius: 3px;
            background: var(--secondary);
        }
        .bottom-tab-nav .tab-item {
            position: relative;
        }

        /* ========== Hero 区域 ========== */
        .hero-section {
            position: relative;
            min-height: 92vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: linear-gradient(135deg, var(--bg-dark) 0%, #162a4a 60%, #1f3a5e 100%);
            overflow: hidden;
            padding: 4rem 0 6rem;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            opacity: 0.25;
            z-index: 0;
            animation: heroZoom 20s ease-in-out infinite alternate;
        }
        @keyframes heroZoom {
            0% {
                transform: scale(1);
            }
            100% {
                transform: scale(1.05);
            }
        }
        .hero-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(230, 57, 70, 0.15) 0%, transparent 70%),
                radial-gradient(ellipse at 70% 20%, rgba(249, 199, 79, 0.08) 0%, transparent 60%);
            z-index: 1;
        }
        .hero-section .container {
            position: relative;
            z-index: 2;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: 50px;
            padding: 0.4rem 1.2rem 0.4rem 0.8rem;
            color: var(--accent-light);
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 1.5rem;
            letter-spacing: 0.3px;
        }
        .hero-badge i {
            font-size: 1rem;
            color: var(--accent);
        }
        .hero-section h1 {
            font-size: 3.5rem;
            font-weight: 900;
            line-height: 1.15;
            color: var(--text-white);
            margin-bottom: 1.2rem;
            letter-spacing: -1px;
            text-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
        }
        .hero-section h1 .highlight {
            background: linear-gradient(135deg, var(--accent), var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-section .hero-sub {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 700px;
            margin: 0 auto 2rem;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn-hero {
            padding: 0.9rem 2.5rem;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.05rem;
            border: none;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            box-shadow: 0 8px 30px rgba(230, 57, 70, 0.3);
        }
        .btn-hero-primary {
            background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
            color: #fff;
        }
        .btn-hero-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(230, 57, 70, 0.45);
            color: #fff;
        }
        .btn-hero-secondary {
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            box-shadow: none;
        }
        .btn-hero-secondary:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: translateY(-3px);
            color: #fff;
        }

        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 3rem;
            margin-top: 3.5rem;
            flex-wrap: wrap;
        }
        .hero-stat-item {
            text-align: center;
            color: rgba(255, 255, 255, 0.9);
        }
        .hero-stat-item .num {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--accent);
            display: block;
            line-height: 1.2;
        }
        .hero-stat-item .label {
            font-size: 0.85rem;
            opacity: 0.75;
            margin-top: 0.2rem;
        }

        /* ========== 通用板块 ========== */
        .section-padding {
            padding: 5rem 0;
        }
        .section-title {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 0.75rem;
            letter-spacing: -0.5px;
        }
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto 3rem;
            line-height: 1.8;
        }
        .section-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: rgba(230, 57, 70, 0.08);
            color: var(--secondary);
            padding: 0.3rem 1rem;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
            letter-spacing: 0.5px;
        }

        /* ========== 卡片 ========== */
        .card-custom {
            background: var(--bg-card);
            border: none;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            overflow: hidden;
            height: 100%;
        }
        .card-custom:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        .card-custom .card-body {
            padding: 1.8rem 1.5rem;
        }
        .card-custom .card-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            border-radius: 14px;
            font-size: 1.5rem;
            color: #fff;
            margin-bottom: 1rem;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
        }
        .card-custom .card-icon.alt {
            background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
        }
        .card-custom .card-icon.accent {
            background: linear-gradient(135deg, var(--accent), #fbbf24);
            color: var(--primary-dark);
        }
        .card-custom .card-title {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 0.6rem;
        }
        .card-custom .card-text {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        .card-cover {
            position: relative;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            height: 100%;
            background: var(--bg-card);
        }
        .card-cover:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        .card-cover .cover-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: var(--transition);
        }
        .card-cover:hover .cover-img {
            transform: scale(1.05);
        }
        .card-cover .cover-body {
            padding: 1.25rem 1.5rem 1.5rem;
        }
        .card-cover .cover-body h5 {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--primary);
            margin-bottom: 0.4rem;
        }
        .card-cover .cover-body p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-bottom: 0;
        }
        .card-cover .cover-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--secondary);
            color: #fff;
            padding: 0.2rem 0.9rem;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(230, 57, 70, 0.3);
        }

        /* ========== 流程步骤 ========== */
        .step-item {
            display: flex;
            gap: 1.2rem;
            align-items: flex-start;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            background: var(--bg-card);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            margin-bottom: 1rem;
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
        }
        .step-number {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.2rem;
            color: #fff;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
        }
        .step-number.alt {
            background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
        }
        .step-number.accent {
            background: linear-gradient(135deg, var(--accent), #fbbf24);
            color: var(--primary-dark);
        }
        .step-content h5 {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--primary);
            margin-bottom: 0.3rem;
        }
        .step-content p {
            color: var(--text-secondary);
            font-size: 0.92rem;
            margin-bottom: 0;
        }

        /* ========== 统计数字块 ========== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }
        .stat-block {
            text-align: center;
            padding: 2rem 1rem;
            border-radius: var(--border-radius);
            background: var(--bg-card);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .stat-block:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .stat-block .stat-num {
            font-size: 2.8rem;
            font-weight: 900;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }
        .stat-block .stat-label {
            font-size: 0.95rem;
            color: var(--text-secondary);
            font-weight: 500;
            margin-top: 0.3rem;
        }

        /* ========== FAQ ========== */
        .faq-accordion .accordion-item {
            border: none;
            border-radius: var(--border-radius-sm) !important;
            margin-bottom: 0.75rem;
            background: var(--bg-card);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
        }
        .faq-accordion .accordion-button {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--primary);
            padding: 1.2rem 1.5rem;
            background: var(--bg-card);
            border: none;
            box-shadow: none;
            border-radius: var(--border-radius-sm) !important;
        }
        .faq-accordion .accordion-button:not(.collapsed) {
            color: var(--secondary);
            background: var(--bg-card);
            box-shadow: none;
        }
        .faq-accordion .accordion-button::after {
            background-size: 1rem;
            filter: brightness(0.4);
        }
        .faq-accordion .accordion-button:not(.collapsed)::after {
            filter: brightness(0) saturate(100%) invert(28%) sepia(94%) saturate(1887%) hue-rotate(337deg) brightness(92%) contrast(96%);
        }
        .faq-accordion .accordion-body {
            padding: 0 1.5rem 1.2rem;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-accordion .accordion-button:focus {
            box-shadow: none;
            border-color: transparent;
        }

        /* ========== CTA 区域 ========== */
        .cta-section {
            background: linear-gradient(135deg, var(--bg-dark) 0%, #162a4a 60%, #1f3a5e 100%);
            padding: 5rem 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 2.6rem;
            font-weight: 900;
            color: var(--text-white);
            margin-bottom: 1rem;
            letter-spacing: -0.5px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto 2rem;
        }
        .btn-cta {
            padding: 1rem 3rem;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.1rem;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
            color: #fff;
            border: none;
            box-shadow: 0 8px 30px rgba(230, 57, 70, 0.35);
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
        }
        .btn-cta:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 45px rgba(230, 57, 70, 0.5);
            color: #fff;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--footer-bg);
            color: rgba(255, 255, 255, 0.7);
            padding: 4rem 0 2rem;
            font-size: 0.95rem;
        }
        .site-footer .footer-brand {
            font-size: 1.3rem;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-bottom: 1rem;
        }
        .site-footer .footer-brand .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
        }
        .site-footer p {
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.8;
            font-size: 0.9rem;
        }
        .site-footer h6 {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 1rem;
        }
        .site-footer .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer .footer-links li {
            margin-bottom: 0.5rem;
        }
        .site-footer .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.9rem;
        }
        .site-footer .footer-links a:hover {
            color: var(--accent-light);
            transform: translateX(3px);
        }
        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 1.5rem;
            margin-top: 2.5rem;
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1024px) {
            .hero-section h1 {
                font-size: 2.8rem;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .section-title {
                font-size: 2rem;
            }
        }

        @media (max-width: 768px) {
            body {
                padding-top: 60px;
                padding-bottom: 64px;
            }
            .top-nav {
                height: 60px;
            }
            .top-nav .navbar-brand {
                font-size: 1.1rem;
            }
            .top-nav .brand-icon {
                width: 32px;
                height: 32px;
                font-size: 1rem;
            }
            .bottom-tab-nav {
                display: flex;
            }
            .hero-section {
                min-height: 80vh;
                padding: 3rem 0 4rem;
            }
            .hero-section h1 {
                font-size: 2rem;
            }
            .hero-section .hero-sub {
                font-size: 1rem;
            }
            .hero-stats {
                gap: 1.5rem;
            }
            .hero-stat-item .num {
                font-size: 1.6rem;
            }
            .section-padding {
                padding: 3rem 0;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .section-subtitle {
                font-size: 0.95rem;
                margin-bottom: 2rem;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1rem;
            }
            .stat-block .stat-num {
                font-size: 2rem;
            }
            .card-custom .card-body {
                padding: 1.25rem;
            }
            .step-item {
                padding: 1rem;
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            .step-number {
                width: 40px;
                height: 40px;
                font-size: 1rem;
            }
            .cta-section h2 {
                font-size: 1.8rem;
            }
            .site-footer {
                padding: 2.5rem 0 1.5rem;
                text-align: center;
            }
            .site-footer .footer-brand {
                justify-content: center;
            }
            .site-footer .footer-links {
                display: flex;
                flex-wrap: wrap;
                justify-content: center;
                gap: 0.3rem 1rem;
            }
            .site-footer .footer-links li {
                margin-bottom: 0.2rem;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .btn-hero {
                width: 100%;
                max-width: 300px;
                justify-content: center;
            }
        }

        @media (max-width: 520px) {
            .hero-section h1 {
                font-size: 1.6rem;
            }
            .hero-section .hero-sub {
                font-size: 0.9rem;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 0.75rem;
            }
            .stat-block {
                padding: 1.2rem 0.6rem;
            }
            .stat-block .stat-num {
                font-size: 1.6rem;
            }
            .stat-block .stat-label {
                font-size: 0.8rem;
            }
            .hero-stats {
                gap: 1rem;
            }
            .hero-stat-item .num {
                font-size: 1.3rem;
            }
            .hero-stat-item .label {
                font-size: 0.75rem;
            }
            .bottom-tab-nav .tab-item {
                min-width: 50px;
                padding: 0.2rem 0.4rem;
            }
            .bottom-tab-nav .tab-item i {
                font-size: 1.1rem;
            }
            .bottom-tab-nav .tab-item span {
                font-size: 0.5rem;
            }
            .card-cover .cover-img {
                height: 150px;
            }
            .btn-cta {
                padding: 0.8rem 2rem;
                font-size: 1rem;
            }
            .faq-accordion .accordion-button {
                font-size: 0.95rem;
                padding: 1rem 1.2rem;
            }
            .faq-accordion .accordion-body {
                padding: 0 1.2rem 1rem;
                font-size: 0.88rem;
            }
        }

        /* ========== 实用辅助 ========== */
        .bg-soft-primary {
            background: rgba(26, 42, 108, 0.04);
        }
        .bg-soft-secondary {
            background: rgba(230, 57, 70, 0.04);
        }
        .text-gradient {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .mb-gap {
            margin-bottom: 2.5rem;
        }
        .gap-1rem {
            gap: 1rem;
        }