/* roulang page: index */
/* ===== 设计变量 ===== */
    :root {
        --primary: #1a4c8a;
        --primary-light: #2563b0;
        --primary-dark: #0f3058;
        --accent: #d4a843;
        --accent-light: #e8c46a;
        --accent-dark: #b8922e;
        --bg-body: #f5f7fa;
        --bg-white: #ffffff;
        --bg-dark: #0b1a2e;
        --bg-card: #ffffff;
        --text-primary: #1a2a3a;
        --text-secondary: #4a5a6a;
        --text-muted: #8a9aaa;
        --text-white: #f0f4f8;
        --border: #dce2ea;
        --border-light: #e8ecf2;
        --shadow-sm: 0 1px 3px rgba(10, 20, 40, 0.06);
        --shadow-md: 0 4px 12px rgba(10, 20, 40, 0.08);
        --shadow-lg: 0 12px 32px rgba(10, 20, 40, 0.12);
        --radius-sm: 6px;
        --radius-md: 12px;
        --radius-lg: 20px;
        --radius-xl: 28px;
        --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        --container-max: 1200px;
        --header-top-height: 64px;
        --nav-height: 52px;
    }

    /* ===== Reset / Base ===== */
    *, *::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: 16px;
        line-height: 1.6;
        color: var(--text-primary);
        background: var(--bg-body);
    }
    img { max-width: 100%; height: auto; display: block; }
    a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
    a:hover { color: var(--primary-light); }
    a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
    button, input, select, textarea { font-family: inherit; font-size: inherit; }
    button { cursor: pointer; border: none; background: none; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text-primary); }

    /* ===== 容器 ===== */
    .container {
        width: 100%;
        max-width: var(--container-max);
        margin: 0 auto;
        padding: 0 24px;
    }
    @media (max-width: 768px) {
        .container { padding: 0 16px; }
    }

    /* ===== 辅助 ===== */
    .section-padding { padding: 80px 0; }
    @media (max-width: 768px) { .section-padding { padding: 48px 0; } }
    .section-title {
        font-size: 2rem;
        font-weight: 700;
        text-align: center;
        margin-bottom: 12px;
        color: var(--text-primary);
    }
    .section-subtitle {
        font-size: 1.05rem;
        color: var(--text-secondary);
        text-align: center;
        max-width: 640px;
        margin: 0 auto 48px;
        line-height: 1.7;
    }
    @media (max-width: 768px) {
        .section-title { font-size: 1.6rem; }
        .section-subtitle { font-size: 0.95rem; margin-bottom: 32px; }
    }

    .btn {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 12px 28px;
        border-radius: var(--radius-sm);
        font-weight: 600;
        font-size: 0.95rem;
        transition: all var(--transition);
        border: 2px solid transparent;
        white-space: nowrap;
    }
    .btn-primary {
        background: var(--primary);
        color: #fff;
        border-color: var(--primary);
    }
    .btn-primary:hover {
        background: var(--primary-light);
        border-color: var(--primary-light);
        color: #fff;
        transform: translateY(-2px);
        box-shadow: 0 8px 20px rgba(26, 76, 138, 0.25);
    }
    .btn-primary:active { transform: translateY(0); box-shadow: none; }
    .btn-accent {
        background: var(--accent);
        color: #1a2a3a;
        border-color: var(--accent);
    }
    .btn-accent:hover {
        background: var(--accent-light);
        border-color: var(--accent-light);
        color: #1a2a3a;
        transform: translateY(-2px);
        box-shadow: 0 8px 20px rgba(212, 168, 67, 0.30);
    }
    .btn-accent:active { transform: translateY(0); box-shadow: none; }
    .btn-outline {
        background: transparent;
        color: var(--primary);
        border-color: var(--primary);
    }
    .btn-outline:hover {
        background: var(--primary);
        color: #fff;
        transform: translateY(-2px);
    }
    .btn-outline:active { transform: translateY(0); }
    .btn-white {
        background: #fff;
        color: var(--primary-dark);
        border-color: #fff;
    }
    .btn-white:hover {
        background: var(--accent-light);
        border-color: var(--accent-light);
        color: #1a2a3a;
        transform: translateY(-2px);
    }
    .btn-sm { padding: 8px 18px; font-size: 0.85rem; }

    .badge {
        display: inline-block;
        padding: 4px 14px;
        border-radius: 20px;
        font-size: 0.8rem;
        font-weight: 600;
        background: rgba(26, 76, 138, 0.08);
        color: var(--primary);
        letter-spacing: 0.3px;
    }
    .badge-accent {
        background: rgba(212, 168, 67, 0.15);
        color: #8a6a1a;
    }
    .badge-green {
        background: rgba(16, 185, 129, 0.12);
        color: #047857;
    }

    /* ===== 顶部栏 + 导航 (双层) ===== */
    .site-header {
        position: sticky;
        top: 0;
        z-index: 100;
        background: var(--bg-white);
        box-shadow: var(--shadow-sm);
        border-bottom: 1px solid var(--border);
    }
    .header-top {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: var(--header-top-height);
        padding: 0 24px;
        max-width: var(--container-max);
        margin: 0 auto;
        gap: 16px;
    }
    .header-brand {
        display: flex;
        align-items: center;
        gap: 6px;
        flex-shrink: 0;
    }
    .header-brand .logo-icon {
        width: 36px;
        height: 36px;
        background: linear-gradient(135deg, var(--primary), var(--primary-light));
        border-radius: var(--radius-sm);
        display: flex;
        align-items: center;
        justify-content: center;
        color: #fff;
        font-size: 1.2rem;
        font-weight: 800;
        letter-spacing: -0.5px;
    }
    .header-brand .logo-text {
        font-size: 1.3rem;
        font-weight: 700;
        color: var(--text-primary);
        letter-spacing: 0.5px;
    }
    .header-brand .logo-text span { color: var(--accent); }
    .header-actions {
        display: flex;
        align-items: center;
        gap: 12px;
        flex-shrink: 0;
    }
    .header-search {
        display: flex;
        align-items: center;
        background: var(--bg-body);
        border-radius: var(--radius-sm);
        padding: 0 12px;
        border: 1px solid var(--border);
        transition: border-color var(--transition);
    }
    .header-search:focus-within { border-color: var(--primary); }
    .header-search input {
        border: none;
        background: transparent;
        padding: 8px 6px;
        font-size: 0.9rem;
        color: var(--text-primary);
        outline: none;
        width: 180px;
    }
    .header-search input::placeholder { color: var(--text-muted); }
    .header-search button {
        color: var(--text-muted);
        padding: 6px;
        font-size: 0.95rem;
        transition: color var(--transition);
    }
    .header-search button:hover { color: var(--primary); }

    /* 导航栏 - 频道 Tabs */
    .header-nav {
        border-top: 1px solid var(--border-light);
        background: var(--bg-white);
    }
    .header-nav .nav-inner {
        display: flex;
        align-items: center;
        gap: 4px;
        padding: 0 24px;
        height: var(--nav-height);
        max-width: var(--container-max);
        margin: 0 auto;
        overflow-x: auto;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    .header-nav .nav-inner::-webkit-scrollbar { display: none; }
    .header-nav .nav-item {
        display: inline-flex;
        align-items: center;
        padding: 8px 20px;
        border-radius: 20px;
        font-size: 0.9rem;
        font-weight: 500;
        color: var(--text-secondary);
        white-space: nowrap;
        transition: all var(--transition);
        position: relative;
    }
    .header-nav .nav-item i { margin-right: 6px; font-size: 0.85rem; }
    .header-nav .nav-item:hover {
        color: var(--primary);
        background: rgba(26, 76, 138, 0.06);
    }
    .header-nav .nav-item.active {
        color: var(--primary);
        background: rgba(26, 76, 138, 0.10);
        font-weight: 600;
    }
    .header-nav .nav-item.active::after {
        content: '';
        position: absolute;
        bottom: -1px;
        left: 50%;
        transform: translateX(-50%);
        width: 60%;
        height: 3px;
        background: var(--accent);
        border-radius: 3px 3px 0 0;
    }

    /* 移动端菜单按钮 (桌面隐藏) */
    .mobile-menu-toggle { display: none; font-size: 1.4rem; color: var(--text-primary); padding: 4px; }

    /* ===== Hero ===== */
    .hero {
        position: relative;
        min-height: 520px;
        display: flex;
        align-items: center;
        background: var(--bg-dark);
        overflow: hidden;
    }
    .hero-bg {
        position: absolute;
        inset: 0;
        background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
        opacity: 0.35;
        mix-blend-mode: overlay;
    }
    .hero-overlay {
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(11, 26, 46, 0.92) 30%, rgba(11, 26, 46, 0.70) 70%, rgba(11, 26, 46, 0.50) 100%);
    }
    .hero .container {
        position: relative;
        z-index: 2;
        padding: 80px 24px;
        text-align: center;
    }
    .hero-badge {
        display: inline-block;
        padding: 6px 20px;
        border-radius: 20px;
        background: rgba(212, 168, 67, 0.18);
        color: var(--accent-light);
        font-size: 0.85rem;
        font-weight: 600;
        letter-spacing: 0.5px;
        margin-bottom: 20px;
        backdrop-filter: blur(4px);
    }
    .hero h1 {
        font-size: 3rem;
        font-weight: 800;
        color: var(--text-white);
        letter-spacing: -0.5px;
        margin-bottom: 16px;
        line-height: 1.2;
    }
    .hero h1 span { color: var(--accent); }
    .hero p {
        font-size: 1.15rem;
        color: rgba(240, 248, 255, 0.80);
        max-width: 600px;
        margin: 0 auto 32px;
        line-height: 1.7;
    }
    .hero-actions {
        display: flex;
        gap: 16px;
        justify-content: center;
        flex-wrap: wrap;
    }
    @media (max-width: 768px) {
        .hero { min-height: 400px; }
        .hero .container { padding: 56px 16px; }
        .hero h1 { font-size: 2rem; }
        .hero p { font-size: 1rem; }
        .hero-actions { flex-direction: column; align-items: center; }
    }

    /* ===== 平台简介 ===== */
    .intro-section {
        background: var(--bg-white);
        border-bottom: 1px solid var(--border-light);
    }
    .intro-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 48px;
        align-items: center;
    }
    .intro-image {
        border-radius: var(--radius-lg);
        overflow: hidden;
        box-shadow: var(--shadow-md);
    }
    .intro-image img { width: 100%; height: 320px; object-fit: cover; }
    .intro-content h2 { font-size: 1.8rem; margin-bottom: 16px; }
    .intro-content p { color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }
    .intro-stats {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
        margin-top: 24px;
    }
    .intro-stat {
        text-align: center;
        padding: 16px 8px;
        background: var(--bg-body);
        border-radius: var(--radius-md);
    }
    .intro-stat .num { font-size: 1.6rem; font-weight: 800; color: var(--primary); }
    .intro-stat .label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }
    @media (max-width: 768px) {
        .intro-grid { grid-template-columns: 1fr; gap: 32px; }
        .intro-image img { height: 220px; }
        .intro-content h2 { font-size: 1.4rem; }
        .intro-stats { grid-template-columns: repeat(3, 1fr); gap: 8px; }
        .intro-stat .num { font-size: 1.3rem; }
    }

    /* ===== 核心功能 ===== */
    .features-section {
        background: var(--bg-body);
    }
    .features-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
    .feature-card {
        background: var(--bg-card);
        border-radius: var(--radius-md);
        padding: 32px 24px;
        text-align: center;
        box-shadow: var(--shadow-sm);
        border: 1px solid var(--border-light);
        transition: all var(--transition);
    }
    .feature-card:hover {
        transform: translateY(-6px);
        box-shadow: var(--shadow-lg);
        border-color: transparent;
    }
    .feature-icon {
        width: 64px;
        height: 64px;
        margin: 0 auto 16px;
        background: linear-gradient(135deg, var(--primary), var(--primary-light));
        border-radius: var(--radius-md);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.6rem;
        color: #fff;
    }
    .feature-card h3 { font-size: 1.15rem; margin-bottom: 8px; }
    .feature-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }
    @media (max-width: 768px) {
        .features-grid { grid-template-columns: 1fr; gap: 16px; }
        .feature-card { padding: 24px 16px; }
    }
    @media (min-width: 769px) and (max-width: 1024px) {
        .features-grid { grid-template-columns: repeat(2, 1fr); }
    }

    /* ===== 分类入口 ===== */
    .category-section {
        background: var(--bg-white);
        border-top: 1px solid var(--border-light);
        border-bottom: 1px solid var(--border-light);
    }
    .category-card {
        display: flex;
        align-items: center;
        gap: 32px;
        background: var(--bg-body);
        border-radius: var(--radius-lg);
        overflow: hidden;
        box-shadow: var(--shadow-sm);
        border: 1px solid var(--border-light);
        transition: all var(--transition);
    }
    .category-card:hover {
        box-shadow: var(--shadow-md);
        transform: translateY(-4px);
    }
    .category-card .cat-image {
        flex: 0 0 280px;
        height: 200px;
        overflow: hidden;
    }
    .category-card .cat-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
    .category-card:hover .cat-image img { transform: scale(1.05); }
    .category-card .cat-body { flex: 1; padding: 28px 28px 28px 0; }
    .category-card .cat-body h3 { font-size: 1.3rem; margin-bottom: 8px; }
    .category-card .cat-body p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; margin-bottom: 16px; }
    @media (max-width: 768px) {
        .category-card { flex-direction: column; gap: 0; }
        .category-card .cat-image { flex: unset; width: 100%; height: 180px; }
        .category-card .cat-body { padding: 20px 16px; }
    }

    /* ===== 最新资讯 (CMS) ===== */
    .news-section {
        background: var(--bg-body);
    }
    .news-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
    .news-card {
        background: var(--bg-card);
        border-radius: var(--radius-md);
        overflow: hidden;
        box-shadow: var(--shadow-sm);
        border: 1px solid var(--border-light);
        transition: all var(--transition);
    }
    .news-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-md);
    }
    .news-card .news-img {
        height: 180px;
        overflow: hidden;
        background: var(--border);
    }
    .news-card .news-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
    .news-card:hover .news-img img { transform: scale(1.05); }
    .news-card .news-body { padding: 20px 20px 24px; }
    .news-card .news-meta {
        display: flex;
        align-items: center;
        gap: 12px;
        font-size: 0.8rem;
        color: var(--text-muted);
        margin-bottom: 8px;
    }
    .news-card .news-meta .cat-tag {
        padding: 2px 10px;
        border-radius: 12px;
        background: rgba(26, 76, 138, 0.08);
        color: var(--primary);
        font-weight: 600;
    }
    .news-card h3 { font-size: 1rem; margin-bottom: 6px; line-height: 1.4; }
    .news-card h3 a { color: var(--text-primary); }
    .news-card h3 a:hover { color: var(--primary); }
    .news-card .news-excerpt { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; }
    .news-empty {
        grid-column: 1 / -1;
        text-align: center;
        padding: 48px 16px;
        color: var(--text-muted);
        font-size: 1rem;
        background: var(--bg-card);
        border-radius: var(--radius-md);
        border: 1px dashed var(--border);
    }
    @media (max-width: 768px) {
        .news-grid { grid-template-columns: 1fr; gap: 16px; }
        .news-card .news-img { height: 160px; }
    }
    @media (min-width: 769px) and (max-width: 1024px) {
        .news-grid { grid-template-columns: repeat(2, 1fr); }
    }

    /* ===== 平台优势 / 数据 ===== */
    .advantage-section {
        background: var(--bg-dark);
        color: var(--text-white);
    }
    .advantage-section .section-title { color: var(--text-white); }
    .advantage-section .section-subtitle { color: rgba(240, 248, 255, 0.70); }
    .advantage-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
    }
    .advantage-card {
        background: rgba(255, 255, 255, 0.06);
        backdrop-filter: blur(8px);
        border-radius: var(--radius-md);
        padding: 32px 16px;
        text-align: center;
        border: 1px solid rgba(255, 255, 255, 0.08);
        transition: all var(--transition);
    }
    .advantage-card:hover {
        background: rgba(255, 255, 255, 0.10);
        transform: translateY(-4px);
    }
    .advantage-card .adv-icon {
        font-size: 2rem;
        color: var(--accent);
        margin-bottom: 12px;
    }
    .advantage-card .adv-num {
        font-size: 2rem;
        font-weight: 800;
        color: #fff;
        margin-bottom: 4px;
    }
    .advantage-card .adv-label {
        font-size: 0.9rem;
        color: rgba(240, 248, 255, 0.65);
    }
    @media (max-width: 768px) {
        .advantage-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
        .advantage-card { padding: 24px 12px; }
        .advantage-card .adv-num { font-size: 1.5rem; }
    }
    @media (max-width: 480px) {
        .advantage-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    }

    /* ===== 使用流程 ===== */
    .process-section {
        background: var(--bg-white);
    }
    .process-steps {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
        position: relative;
    }
    .process-steps::before {
        content: '';
        position: absolute;
        top: 36px;
        left: 12%;
        right: 12%;
        height: 2px;
        background: linear-gradient(to right, var(--primary), var(--accent), var(--primary));
        opacity: 0.3;
    }
    .process-step {
        text-align: center;
        position: relative;
        z-index: 1;
    }
    .step-circle {
        width: 72px;
        height: 72px;
        margin: 0 auto 16px;
        background: linear-gradient(135deg, var(--primary), var(--primary-light));
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.5rem;
        font-weight: 700;
        color: #fff;
        box-shadow: 0 4px 16px rgba(26, 76, 138, 0.25);
    }
    .process-step h4 { font-size: 1.05rem; margin-bottom: 6px; }
    .process-step p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; }
    @media (max-width: 768px) {
        .process-steps { grid-template-columns: repeat(2, 1fr); gap: 32px 16px; }
        .process-steps::before { display: none; }
        .step-circle { width: 60px; height: 60px; font-size: 1.2rem; }
    }
    @media (max-width: 480px) {
        .process-steps { grid-template-columns: 1fr; gap: 24px; }
    }

    /* ===== FAQ ===== */
    .faq-section {
        background: var(--bg-body);
        border-top: 1px solid var(--border-light);
    }
    .faq-list { max-width: 780px; margin: 0 auto; }
    .faq-item {
        background: var(--bg-card);
        border-radius: var(--radius-md);
        margin-bottom: 12px;
        border: 1px solid var(--border-light);
        overflow: hidden;
        transition: box-shadow var(--transition);
    }
    .faq-item:hover { box-shadow: var(--shadow-sm); }
    .faq-question {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 18px 24px;
        font-weight: 600;
        font-size: 1rem;
        color: var(--text-primary);
        cursor: pointer;
        transition: background var(--transition);
    }
    .faq-question:hover { background: rgba(26, 76, 138, 0.03); }
    .faq-question i { color: var(--text-muted); transition: transform var(--transition); font-size: 0.9rem; }
    .faq-item.open .faq-question i { transform: rotate(180deg); color: var(--primary); }
    .faq-answer {
        padding: 0 24px 18px;
        font-size: 0.93rem;
        color: var(--text-secondary);
        line-height: 1.7;
        display: none;
    }
    .faq-item.open .faq-answer { display: block; }
    @media (max-width: 768px) {
        .faq-question { padding: 14px 16px; font-size: 0.95rem; }
        .faq-answer { padding: 0 16px 14px; }
    }

    /* ===== CTA ===== */
    .cta-section {
        background: linear-gradient(135deg, var(--primary-dark), var(--primary));
        position: relative;
        overflow: hidden;
    }
    .cta-section::before {
        content: '';
        position: absolute;
        inset: 0;
        background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
        opacity: 0.08;
        mix-blend-mode: overlay;
    }
    .cta-section .container { position: relative; z-index: 2; text-align: center; padding: 72px 24px; }
    .cta-section h2 {
        font-size: 2rem;
        color: #fff;
        margin-bottom: 12px;
    }
    .cta-section p {
        font-size: 1.05rem;
        color: rgba(255, 255, 255, 0.75);
        max-width: 540px;
        margin: 0 auto 28px;
    }
    .cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
    @media (max-width: 768px) {
        .cta-section .container { padding: 48px 16px; }
        .cta-section h2 { font-size: 1.5rem; }
        .cta-actions { flex-direction: column; align-items: center; }
    }

    /* ===== 页脚 ===== */
    .site-footer {
        background: var(--bg-dark);
        color: rgba(240, 248, 255, 0.60);
        padding: 48px 0 32px;
        border-top: 1px solid rgba(255, 255, 255, 0.06);
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 32px;
        margin-bottom: 32px;
    }
    .footer-brand .logo-text {
        font-size: 1.2rem;
        font-weight: 700;
        color: #fff;
        display: inline-block;
        margin-bottom: 12px;
    }
    .footer-brand .logo-text span { color: var(--accent); }
    .footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 300px; }
    .footer-col h4 {
        color: #fff;
        font-size: 0.95rem;
        font-weight: 600;
        margin-bottom: 16px;
    }
    .footer-col ul li { margin-bottom: 8px; }
    .footer-col ul li a {
        color: rgba(240, 248, 255, 0.55);
        font-size: 0.88rem;
        transition: color var(--transition);
    }
    .footer-col ul li a:hover { color: var(--accent); }
    .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, 0.06);
        padding-top: 20px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 12px;
        font-size: 0.85rem;
    }
    .footer-bottom a { color: rgba(240, 248, 255, 0.55); }
    .footer-bottom a:hover { color: var(--accent); }
    .footer-social { display: flex; gap: 12px; }
    .footer-social a {
        width: 36px;
        height: 36px;
        border-radius: 50%;
        background: rgba(255, 255, 255, 0.06);
        display: flex;
        align-items: center;
        justify-content: center;
        color: rgba(240, 248, 255, 0.50);
        transition: all var(--transition);
    }
    .footer-social a:hover { background: var(--accent); color: #1a2a3a; }
    @media (max-width: 768px) {
        .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
        .footer-brand { grid-column: 1 / -1; }
        .footer-bottom { flex-direction: column; text-align: center; }
    }
    @media (max-width: 480px) {
        .footer-grid { grid-template-columns: 1fr; }
    }

    /* ===== 移动端导航抽屉 ===== */
    @media (max-width: 768px) {
        .mobile-menu-toggle { display: block; }
        .header-search input { width: 120px; }
        .header-actions .btn { display: none; }
        .header-actions .btn-sm { display: inline-flex; }
        .header-nav { overflow-x: auto; }
        .header-nav .nav-inner { gap: 2px; padding: 0 12px; }
        .header-nav .nav-item { padding: 6px 14px; font-size: 0.85rem; }
        .header-nav .nav-item i { display: none; }
    }
    @media (max-width: 480px) {
        .header-top { padding: 0 12px; gap: 8px; }
        .header-brand .logo-text { font-size: 1.1rem; }
        .header-search input { width: 80px; }
    }

    /* ===== 滚动动画 ===== */
    .fade-up {
        opacity: 0;
        transform: translateY(24px);
        transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .fade-up.visible {
        opacity: 1;
        transform: translateY(0);
    }

    /* ===== 按钮通用微调 ===== */
    .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
    .btn i { font-size: 0.9em; }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a56db;
            --primary-light: #3b82f6;
            --primary-dark: #1e3a8a;
            --primary-bg: #eff6ff;
            --secondary: #f59e0b;
            --secondary-light: #fbbf24;
            --accent: #10b981;
            --dark: #0f172a;
            --dark-soft: #1e293b;
            --gray-900: #111827;
            --gray-800: #1f2937;
            --gray-700: #374151;
            --gray-600: #4b5563;
            --gray-500: #6b7280;
            --gray-400: #9ca3af;
            --gray-300: #d1d5db;
            --gray-200: #e5e7eb;
            --gray-100: #f3f4f6;
            --gray-50: #f9fafb;
            --white: #ffffff;
            --bg-body: #f8fafc;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border-color: #e2e8f0;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 14px rgba(0,0,0,0.08);
            --shadow-lg: 0 10px 40px rgba(0,0,0,0.10);
            --shadow-xl: 0 20px 60px rgba(0,0,0,0.12);
            --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;
            --max-width: 1200px;
            --header-height: 72px;
            --nav-channel-height: 56px;
        }

        /* ===== 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: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-md); }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--dark); }
        p { margin-bottom: 1rem; color: var(--text-secondary); }
        ul, ol { list-style: none; }
        button { cursor: pointer; font-family: inherit; border: none; background: none; }
        input, textarea { font-family: inherit; font-size: 1rem; border: 1px solid var(--border-color); border-radius: var(--radius-sm); padding: 0.65rem 1rem; outline: none; transition: var(--transition); background: var(--white); color: var(--text-primary); }
        input:focus, textarea:focus { border-color: var(--primary-light); box-shadow: 0 0 0 3px rgba(59,130,246,0.15); }
        .container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
        .page-wrapper { min-height: 100vh; display: flex; flex-direction: column; }
        .page-wrapper main { flex: 1; }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex; align-items: center; gap: 8px; padding: 0.7rem 1.8rem; border-radius: var(--radius-sm);
            font-weight: 600; font-size: 0.95rem; transition: var(--transition); border: 2px solid transparent;
            justify-content: center; text-align: center; line-height: 1.4;
        }
        .btn-primary { background: var(--primary); color: var(--white); border-color: var(--primary); }
        .btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: var(--white); transform: translateY(-2px); box-shadow: 0 8px 25px rgba(26,86,219,0.3); }
        .btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
        .btn-outline:hover { background: var(--primary); color: var(--white); transform: translateY(-2px); box-shadow: 0 8px 25px rgba(26,86,219,0.2); }
        .btn-sm { padding: 0.45rem 1.2rem; font-size: 0.85rem; }
        .btn-lg { padding: 0.95rem 2.4rem; font-size: 1.05rem; border-radius: var(--radius-md); }
        .btn-secondary { background: var(--secondary); color: var(--dark); border-color: var(--secondary); }
        .btn-secondary:hover { background: var(--secondary-light); color: var(--dark); transform: translateY(-2px); box-shadow: 0 8px 25px rgba(245,158,11,0.3); }

        /* ===== 徽章 / 标签 ===== */
        .badge {
            display: inline-block; padding: 0.25rem 0.85rem; border-radius: 50px; font-size: 0.75rem; font-weight: 600;
            letter-spacing: 0.3px; background: var(--primary-bg); color: var(--primary);
        }
        .badge-secondary { background: #fef3c7; color: #92400e; }
        .badge-accent { background: #d1fae5; color: #065f46; }
        .badge-gray { background: var(--gray-100); color: var(--gray-600); }

        /* ===== 卡片 ===== */
        .card {
            background: var(--white); border-radius: var(--radius-md); border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm); transition: var(--transition); overflow: hidden;
        }
        .card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
        .card-body { padding: 1.5rem; }
        .card-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; border-radius: var(--radius-md) var(--radius-md) 0 0; }

        /* ===== Header & 导航 ===== */
        .site-header {
            background: var(--white);
            border-bottom: 1px solid var(--border-color);
            position: sticky; top: 0; z-index: 100;
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
        }
        .header-main {
            display: flex; align-items: center; justify-content: space-between;
            height: var(--header-height); padding: 0 24px; max-width: var(--max-width); margin: 0 auto;
        }
        .logo-text {
            font-size: 1.5rem; font-weight: 800; color: var(--dark);
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text; letter-spacing: -0.5px;
        }
        .logo-text span { color: var(--secondary); -webkit-text-fill-color: var(--secondary); }
        .header-actions { display: flex; align-items: center; gap: 12px; }
        .search-box {
            display: flex; align-items: center; background: var(--gray-100);
            border-radius: 50px; padding: 0 16px; border: 1px solid transparent; transition: var(--transition);
        }
        .search-box:focus-within { background: var(--white); border-color: var(--primary-light); box-shadow: 0 0 0 3px rgba(59,130,246,0.1); }
        .search-box input { border: none; background: transparent; padding: 0.5rem 0.5rem; width: 160px; font-size: 0.9rem; }
        .search-box input:focus { box-shadow: none; }
        .search-box i { color: var(--gray-400); font-size: 0.9rem; }

        /* ===== 频道导航 Tabs ===== */
        .header-nav {
            background: var(--dark-soft); border-top: 1px solid rgba(255,255,255,0.06); overflow-x: auto;
            -webkit-overflow-scrolling: touch; scrollbar-width: none;
        }
        .header-nav::-webkit-scrollbar { display: none; }
        .nav-inner {
            display: flex; align-items: center; gap: 4px; padding: 0 24px; height: var(--nav-channel-height);
            max-width: var(--max-width); margin: 0 auto;
        }
        .nav-item {
            display: inline-flex; align-items: center; gap: 6px; padding: 0.5rem 1.2rem; border-radius: 50px;
            font-size: 0.85rem; font-weight: 500; color: rgba(255,255,255,0.75); white-space: nowrap;
            transition: var(--transition); border: 1px solid transparent;
        }
        .nav-item i { font-size: 0.8rem; opacity: 0.8; }
        .nav-item:hover { color: var(--white); background: rgba(255,255,255,0.08); }
        .nav-item.active { color: var(--white); background: var(--primary); border-color: var(--primary); box-shadow: 0 2px 12px rgba(26,86,219,0.3); }
        .nav-item.active i { opacity: 1; }

        /* ===== 移动端菜单按钮 ===== */
        .mobile-toggle { display: none; background: none; border: none; font-size: 1.4rem; color: var(--dark); padding: 4px; }

        /* ===== Breadcrumb ===== */
        .breadcrumb-bar {
            background: var(--gray-50); border-bottom: 1px solid var(--border-color); padding: 12px 0;
        }
        .breadcrumb-list { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: var(--text-muted); flex-wrap: wrap; }
        .breadcrumb-list a { color: var(--primary); }
        .breadcrumb-list a:hover { color: var(--primary-dark); }
        .breadcrumb-list .sep { color: var(--gray-300); }

        /* ===== 文章主体 ===== */
        .article-section { padding: 48px 0 64px; }
        .article-layout {
            display: grid; grid-template-columns: 1fr 300px; gap: 48px;
        }
        .article-main { min-width: 0; }
        .article-header { margin-bottom: 32px; }
        .article-category { display: inline-block; margin-bottom: 12px; }
        .article-title {
            font-size: 2rem; font-weight: 800; line-height: 1.3; margin-bottom: 16px; color: var(--dark);
        }
        .article-meta {
            display: flex; align-items: center; gap: 20px; flex-wrap: wrap; color: var(--text-muted); font-size: 0.9rem;
            padding-bottom: 20px; border-bottom: 1px solid var(--border-color);
        }
        .article-meta i { margin-right: 4px; }
        .article-meta span { display: inline-flex; align-items: center; }
        .article-featured-image { margin-bottom: 32px; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); }
        .article-featured-image img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
        .article-content {
            font-size: 1.05rem; line-height: 1.9; color: var(--text-secondary);
        }
        .article-content h2 { font-size: 1.5rem; margin-top: 36px; margin-bottom: 16px; color: var(--dark); }
        .article-content h3 { font-size: 1.2rem; margin-top: 28px; margin-bottom: 12px; color: var(--dark); }
        .article-content p { margin-bottom: 1.2rem; }
        .article-content ul, .article-content ol { margin-bottom: 1.2rem; padding-left: 1.8rem; list-style: disc; }
        .article-content li { margin-bottom: 0.4rem; color: var(--text-secondary); }
        .article-content blockquote {
            border-left: 4px solid var(--primary); background: var(--primary-bg); padding: 1rem 1.5rem;
            margin: 1.5rem 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-secondary);
        }
        .article-content img { margin: 1.5rem 0; border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }
        .article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
        .article-content a:hover { color: var(--primary-dark); }

        /* ===== 文章侧边栏 ===== */
        .article-sidebar { min-width: 0; }
        .sidebar-card {
            background: var(--white); border-radius: var(--radius-md); border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm); padding: 1.5rem; margin-bottom: 24px;
        }
        .sidebar-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 16px; color: var(--dark); padding-bottom: 12px; border-bottom: 2px solid var(--primary); }
        .sidebar-list { display: flex; flex-direction: column; gap: 12px; }
        .sidebar-list-item { display: flex; gap: 12px; align-items: flex-start; padding: 8px 0; border-bottom: 1px solid var(--gray-100); }
        .sidebar-list-item:last-child { border-bottom: none; }
        .sidebar-list-item img { width: 64px; height: 48px; border-radius: var(--radius-sm); object-fit: cover; flex-shrink: 0; }
        .sidebar-list-item .item-info { flex: 1; min-width: 0; }
        .sidebar-list-item .item-info a { font-size: 0.9rem; font-weight: 600; color: var(--dark); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; line-height: 1.4; }
        .sidebar-list-item .item-info a:hover { color: var(--primary); }
        .sidebar-list-item .item-info .item-date { font-size: 0.75rem; color: var(--text-muted); margin-top: 4px; }
        .sidebar-tags { display: flex; flex-wrap: wrap; gap: 8px; }
        .sidebar-tags a { padding: 0.3rem 1rem; border-radius: 50px; background: var(--gray-100); color: var(--text-secondary); font-size: 0.8rem; font-weight: 500; transition: var(--transition); border: 1px solid transparent; }
        .sidebar-tags a:hover { background: var(--primary-bg); color: var(--primary); border-color: var(--primary); }

        /* ===== 404 状态 ===== */
        .not-found-box { text-align: center; padding: 80px 24px; }
        .not-found-box i { font-size: 4rem; color: var(--gray-300); margin-bottom: 24px; }
        .not-found-box h2 { font-size: 1.8rem; margin-bottom: 12px; color: var(--dark); }
        .not-found-box p { color: var(--text-muted); margin-bottom: 24px; font-size: 1.05rem; }

        /* ===== 相关文章 ===== */
        .related-section { background: var(--gray-50); padding: 48px 0; border-top: 1px solid var(--border-color); }
        .related-section h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 28px; text-align: center; }
        .related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .related-card .card-body { padding: 1.2rem; }
        .related-card .card-body h3 { font-size: 1rem; font-weight: 600; margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .related-card .card-body .meta { font-size: 0.8rem; color: var(--text-muted); }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--dark); color: rgba(255,255,255,0.8); padding: 48px 0 0;
            border-top: 4px solid var(--primary);
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 32px; }
        .footer-brand .logo-text { font-size: 1.3rem; margin-bottom: 12px; display: inline-block; }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.6); line-height: 1.7; max-width: 360px; margin-top: 12px; }
        .footer-col h4 { color: var(--white); font-size: 1rem; font-weight: 700; margin-bottom: 16px; }
        .footer-col ul { display: flex; flex-direction: column; gap: 10px; }
        .footer-col ul li a { color: rgba(255,255,255,0.65); font-size: 0.9rem; transition: var(--transition); }
        .footer-col ul li a:hover { color: var(--secondary); padding-left: 4px; }
        .footer-social { display: flex; gap: 12px; margin-top: 8px; }
        .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: 1.1rem; transition: var(--transition); }
        .footer-social a:hover { background: var(--primary); color: var(--white); transform: translateY(-3px); }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding: 20px 0; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; color: rgba(255,255,255,0.5); }
        .footer-bottom a { color: rgba(255,255,255,0.7); }
        .footer-bottom a:hover { color: var(--secondary); }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
            .sidebar-card { margin-bottom: 0; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .related-grid { grid-template-columns: repeat(2, 1fr); }
        }

        @media (max-width: 768px) {
            :root { --header-height: 60px; --nav-channel-height: 48px; }
            .container { padding: 0 16px; }
            .header-main { padding: 0 16px; height: var(--header-height); }
            .logo-text { font-size: 1.2rem; }
            .search-box input { width: 100px; }
            .search-box { padding: 0 10px; }
            .mobile-toggle { display: block; }
            .header-actions .btn span { display: none; }
            .nav-inner { padding: 0 12px; gap: 2px; }
            .nav-item { padding: 0.4rem 0.9rem; font-size: 0.8rem; }
            .nav-item i { margin-right: 2px; }
            .article-title { font-size: 1.5rem; }
            .article-content { font-size: 1rem; }
            .article-sidebar { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-brand p { max-width: 100%; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .related-grid { grid-template-columns: 1fr; }
        }

        @media (max-width: 520px) {
            .article-meta { gap: 10px; font-size: 0.8rem; flex-wrap: wrap; }
            .article-title { font-size: 1.25rem; }
            .breadcrumb-list { font-size: 0.75rem; }
            .btn-lg { padding: 0.75rem 1.6rem; font-size: 0.95rem; }
            .header-actions .btn { padding: 0.4rem 1rem; font-size: 0.8rem; }
            .search-box { display: none; }
        }

        /* ===== 动画 ===== */
        .fade-in { animation: fadeIn 0.6s ease-out; }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
        .slide-up { animation: slideUp 0.5s ease-out; }
        @keyframes slideUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
:root {
    --c-primary: #1a2a4a;
    --c-primary-light: #2a406a;
    --c-primary-dark: #0f1a30;
    --c-accent: #e8a838;
    --c-accent-light: #f0c060;
    --c-accent-dark: #c88a20;
    --c-bg: #f5f7fc;
    --c-bg-alt: #eef1f7;
    --c-white: #ffffff;
    --c-text: #1a1a2e;
    --c-text-light: #5a6a7a;
    --c-text-lighter: #8a9aaa;
    --c-border: #dce0e8;
    --c-border-light: #e8ecf2;
    --c-shadow: 0 4px 20px rgba(26,42,74,0.08);
    --c-shadow-hover: 0 8px 32px rgba(26,42,74,0.16);
    --c-radius: 16px;
    --c-radius-sm: 10px;
    --c-radius-lg: 24px;
    --c-transition: 0.3s cubic-bezier(0.4,0,0.2,1);
    --c-font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
    --c-font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    --c-space-xs: 8px;
    --c-space-sm: 16px;
    --c-space-md: 32px;
    --c-space-lg: 56px;
    --c-space-xl: 80px;
}
/* ===== Reset / Base ===== */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--c-font-sans); color: var(--c-text); background: var(--c-bg); line-height: 1.6; font-size: 16px; }
a { color: var(--c-primary); text-decoration: none; transition: var(--c-transition); }
a:hover { color: var(--c-accent); }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea, select { font-family: inherit; font-size: inherit; outline: none; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--c-primary); }
h1 { font-size: 2.8rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.15rem; }
p { margin-bottom: 0.8rem; color: var(--c-text-light); }
.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--c-space-sm); }
.section-pad { padding: var(--c-space-xl) 0; }
.section-title { text-align: center; margin-bottom: var(--c-space-lg); }
.section-title h2 { position: relative; display: inline-block; }
.section-title h2::after { content: ''; display: block; width: 48px; height: 4px; background: var(--c-accent); border-radius: 4px; margin: 12px auto 0; }
.section-title p { font-size: 1.05rem; max-width: 600px; margin: 12px auto 0; color: var(--c-text-light); }
/* ===== Header / Nav ===== */
.site-header { background: var(--c-white); border-bottom: 1px solid var(--c-border-light); position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 16px rgba(26,42,74,0.05); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 1.35rem; color: var(--c-primary); }
.logo i { color: var(--c-accent); font-size: 1.5rem; }
.logo span { color: var(--c-accent); }
.header-nav { display: flex; align-items: center; gap: 4px; }
.nav-item { display: inline-flex; align-items: center; gap: 6px; padding: 10px 20px; border-radius: 100px; font-weight: 600; font-size: 0.92rem; color: var(--c-text-light); transition: var(--c-transition); }
.nav-item i { font-size: 0.95rem; }
.nav-item:hover { color: var(--c-primary); background: var(--c-bg); }
.nav-item.active, .nav-item:active { color: var(--c-white); background: var(--c-primary); box-shadow: 0 4px 12px rgba(26,42,74,0.2); }
.header-cta { display: flex; align-items: center; gap: 12px; }
.header-cta .btn { padding: 8px 22px; border-radius: 100px; font-weight: 600; font-size: 0.9rem; }
.mobile-toggle { display: none; background: none; border: none; font-size: 1.6rem; color: var(--c-primary); cursor: pointer; padding: 4px; }
/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 32px; border-radius: 100px; font-weight: 600; font-size: 0.95rem; border: none; cursor: pointer; transition: var(--c-transition); text-decoration: none; line-height: 1.4; }
.btn-primary { background: var(--c-accent); color: var(--c-primary-dark); box-shadow: 0 4px 14px rgba(232,168,56,0.3); }
.btn-primary:hover { background: var(--c-accent-light); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,168,56,0.4); color: var(--c-primary-dark); }
.btn-primary:active { transform: translateY(0); }
.btn-outline { background: transparent; color: var(--c-primary); border: 2px solid var(--c-primary); }
.btn-outline:hover { background: var(--c-primary); color: var(--c-white); transform: translateY(-2px); }
.btn-light { background: var(--c-white); color: var(--c-primary); box-shadow: var(--c-shadow); }
.btn-light:hover { background: var(--c-bg); transform: translateY(-2px); box-shadow: var(--c-shadow-hover); }
.btn-lg { padding: 16px 40px; font-size: 1.1rem; }
/* ===== Hero ===== */
.hero { position: relative; min-height: 480px; display: flex; align-items: center; overflow: hidden; background: var(--c-primary-dark); color: var(--c-white); border-radius: 0 0 var(--c-radius-lg) var(--c-radius-lg); margin: 0 var(--c-space-sm); margin-top: 8px; }
.hero-bg { position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat; opacity: 0.25; mix-blend-mode: overlay; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(26,42,74,0.92) 0%, rgba(26,42,74,0.7) 70%, rgba(26,42,74,0.4) 100%); }
.hero-content { position: relative; z-index: 2; padding: var(--c-space-xl) var(--c-space-sm); max-width: 700px; }
.hero-content h1 { font-size: 3rem; color: var(--c-white); margin-bottom: 16px; line-height: 1.2; }
.hero-content h1 i { color: var(--c-accent); }
.hero-content p { font-size: 1.15rem; color: rgba(255,255,255,0.8); margin-bottom: 28px; max-width: 580px; line-height: 1.7; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 24px; }
.hero-badge { display: inline-flex; align-items: center; gap: 6px; background: rgba(255,255,255,0.12); backdrop-filter: blur(8px); padding: 6px 16px; border-radius: 100px; font-size: 0.85rem; color: rgba(255,255,255,0.9); border: 1px solid rgba(255,255,255,0.08); }
.hero-badge i { color: var(--c-accent); }
/* ===== Cards ===== */
.card { background: var(--c-white); border-radius: var(--c-radius); box-shadow: var(--c-shadow); padding: 28px; transition: var(--c-transition); border: 1px solid var(--c-border-light); height: 100%; }
.card:hover { transform: translateY(-4px); box-shadow: var(--c-shadow-hover); border-color: var(--c-accent); }
.card-icon { width: 56px; height: 56px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 1.6rem; margin-bottom: 16px; color: var(--c-white); }
.card-icon.blue { background: var(--c-primary); }
.card-icon.gold { background: var(--c-accent); color: var(--c-primary-dark); }
.card-icon.teal { background: #1a7a6a; }
.card-icon.rose { background: #b83a5a; }
.card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.card p { font-size: 0.92rem; color: var(--c-text-light); margin-bottom: 0; }
.card .card-tag { display: inline-block; font-size: 0.75rem; padding: 2px 12px; border-radius: 100px; background: var(--c-bg-alt); color: var(--c-text-light); margin-top: 12px; font-weight: 500; }
/* ===== Stats ===== */
.stats-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; }
.stat-card { background: var(--c-white); border-radius: var(--c-radius); padding: 28px 20px; text-align: center; box-shadow: var(--c-shadow); border: 1px solid var(--c-border-light); transition: var(--c-transition); }
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--c-shadow-hover); }
.stat-number { font-size: 2.2rem; font-weight: 800; color: var(--c-primary); line-height: 1.2; font-family: var(--c-font-mono); }
.stat-number .accent { color: var(--c-accent); }
.stat-label { font-size: 0.9rem; color: var(--c-text-light); margin-top: 6px; font-weight: 500; }
/* ===== Steps ===== */
.steps-row { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; counter-reset: step; }
.step-card { background: var(--c-white); border-radius: var(--c-radius); padding: 28px 24px; box-shadow: var(--c-shadow); border: 1px solid var(--c-border-light); position: relative; transition: var(--c-transition); }
.step-card:hover { transform: translateY(-4px); box-shadow: var(--c-shadow-hover); }
.step-card::before { counter-increment: step; content: '0' counter(step); position: absolute; top: 16px; right: 20px; font-size: 2.6rem; font-weight: 800; color: var(--c-border); line-height: 1; font-family: var(--c-font-mono); opacity: 0.5; }
.step-icon { width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.4rem; color: var(--c-white); margin-bottom: 14px; }
.step-card h4 { font-size: 1.05rem; margin-bottom: 6px; }
.step-card p { font-size: 0.88rem; color: var(--c-text-light); margin-bottom: 0; }
/* ===== Cover Cards (图文) ===== */
.cover-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.cover-card { background: var(--c-white); border-radius: var(--c-radius); overflow: hidden; box-shadow: var(--c-shadow); border: 1px solid var(--c-border-light); transition: var(--c-transition); }
.cover-card:hover { transform: translateY(-4px); box-shadow: var(--c-shadow-hover); }
.cover-card img { width: 100%; height: 200px; object-fit: cover; border-bottom: 3px solid var(--c-accent); }
.cover-card-body { padding: 20px 24px 24px; }
.cover-card-body h3 { font-size: 1.1rem; margin-bottom: 6px; }
.cover-card-body p { font-size: 0.9rem; color: var(--c-text-light); margin-bottom: 0; }
.cover-card-body .tag { display: inline-block; font-size: 0.72rem; padding: 2px 12px; border-radius: 100px; background: var(--c-bg-alt); color: var(--c-text-light); margin-top: 10px; font-weight: 500; }
/* ===== Tips / List ===== */
.tips-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px 32px; }
.tips-list li { display: flex; align-items: flex-start; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--c-border-light); }
.tips-list li:last-child { border-bottom: none; }
.tips-list li i { color: var(--c-accent); font-size: 1.1rem; margin-top: 3px; flex-shrink: 0; }
.tips-list li strong { color: var(--c-primary); font-weight: 600; }
.tips-list li span { color: var(--c-text-light); font-size: 0.92rem; }
/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { background: var(--c-white); border-radius: var(--c-radius-sm); margin-bottom: 12px; border: 1px solid var(--c-border-light); overflow: hidden; transition: var(--c-transition); }
.faq-item:hover { border-color: var(--c-accent); }
.faq-question { display: flex; align-items: center; justify-content: space-between; padding: 18px 24px; cursor: pointer; font-weight: 600; color: var(--c-primary); font-size: 1rem; background: none; border: none; width: 100%; text-align: left; transition: var(--c-transition); }
.faq-question i { color: var(--c-accent); transition: var(--c-transition); font-size: 1.1rem; }
.faq-question[aria-expanded="true"] i { transform: rotate(180deg); }
.faq-answer { padding: 0 24px 18px; color: var(--c-text-light); font-size: 0.92rem; line-height: 1.7; display: none; }
.faq-answer.show { display: block; }
/* ===== CTA Section ===== */
.cta-section { background: var(--c-primary); border-radius: var(--c-radius-lg); padding: var(--c-space-lg) var(--c-space-md); text-align: center; margin: var(--c-space-xl) auto; position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat; opacity: 0.08; mix-blend-mode: overlay; }
.cta-section h2 { color: var(--c-white); font-size: 2.2rem; margin-bottom: 12px; position: relative; }
.cta-section p { color: rgba(255,255,255,0.75); font-size: 1.05rem; max-width: 540px; margin: 0 auto 28px; position: relative; }
.cta-section .btn { position: relative; }
/* ===== Footer ===== */
.site-footer { background: var(--c-primary-dark); color: rgba(255,255,255,0.7); padding: var(--c-space-lg) 0 var(--c-space-sm); margin-top: var(--c-space-xl); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: var(--c-space-md); }
.footer-brand .logo-text { font-size: 1.4rem; font-weight: 800; color: var(--c-white); }
.footer-brand .logo-text span { color: var(--c-accent); }
.footer-brand p { font-size: 0.88rem; color: rgba(255,255,255,0.55); margin-top: 12px; line-height: 1.7; max-width: 320px; }
.footer-col h4 { font-size: 1rem; font-weight: 700; color: var(--c-white); margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: rgba(255,255,255,0.55); font-size: 0.88rem; transition: var(--c-transition); }
.footer-col ul li a:hover { color: var(--c-accent); padding-left: 4px; }
.footer-social { display: flex; gap: 14px; }
.footer-social a { width: 40px; height: 40px; border-radius: 50%; background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.6); font-size: 1.1rem; transition: var(--c-transition); }
.footer-social a:hover { background: var(--c-accent); color: var(--c-primary-dark); transform: translateY(-2px); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); padding-top: 20px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 0.82rem; color: rgba(255,255,255,0.4); }
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--c-accent); }
/* ===== Breadcrumb ===== */
.breadcrumb { display: flex; flex-wrap: wrap; gap: 6px 12px; padding: 16px 0; font-size: 0.88rem; color: var(--c-text-lighter); }
.breadcrumb a { color: var(--c-text-lighter); }
.breadcrumb a:hover { color: var(--c-primary); }
.breadcrumb .sep { color: var(--c-border); }
.breadcrumb .current { color: var(--c-primary); font-weight: 600; }
/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .stats-grid { grid-template-columns: repeat(2,1fr); }
    .steps-row { grid-template-columns: repeat(2,1fr); }
    .cover-grid { grid-template-columns: repeat(2,1fr); }
    .hero-content h1 { font-size: 2.4rem; }
}
@media (max-width: 768px) {
    .mobile-toggle { display: block; }
    .header-nav { display: none; position: absolute; top: 72px; left: 0; right: 0; background: var(--c-white); flex-direction: column; padding: 16px 20px; border-bottom: 1px solid var(--c-border-light); box-shadow: var(--c-shadow); border-radius: 0 0 var(--c-radius-sm) var(--c-radius-sm); }
    .header-nav.open { display: flex; }
    .nav-item { width: 100%; justify-content: flex-start; padding: 12px 16px; }
    .header-cta .btn { display: none; }
    .hero { min-height: 360px; margin: 0 8px; border-radius: 0 0 var(--c-radius) var(--c-radius); }
    .hero-content h1 { font-size: 2rem; }
    .hero-content p { font-size: 1rem; }
    .section-pad { padding: var(--c-space-lg) 0; }
    .stats-grid { grid-template-columns: repeat(2,1fr); gap: 12px; }
    .stat-number { font-size: 1.8rem; }
    .steps-row { grid-template-columns: 1fr; gap: 16px; }
    .cover-grid { grid-template-columns: 1fr; }
    .tips-list { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .cta-section { padding: var(--c-space-md) var(--c-space-sm); border-radius: var(--c-radius); }
    .cta-section h2 { font-size: 1.6rem; }
    .section-title h2 { font-size: 1.6rem; }
    .btn-lg { padding: 14px 32px; font-size: 1rem; }
}
@media (max-width: 520px) {
    .hero-content h1 { font-size: 1.6rem; }
    .hero-badges { gap: 8px; }
    .hero-badge { font-size: 0.75rem; padding: 4px 12px; }
    .stats-grid { grid-template-columns: repeat(2,1fr); gap: 8px; }
    .stat-card { padding: 18px 12px; }
    .stat-number { font-size: 1.5rem; }
    .card { padding: 20px; }
    .step-card { padding: 20px; }
    .container { padding: 0 12px; }
}
/* ===== 辅助 ===== */
.text-accent { color: var(--c-accent); }
.bg-alt { background: var(--c-bg-alt); }
.mt-1 { margin-top: var(--c-space-sm); }
.mt-2 { margin-top: var(--c-space-md); }
.gap-1 { gap: var(--c-space-sm); }
.gap-2 { gap: var(--c-space-md); }
.flex-center { display: flex; align-items: center; justify-content: center; }
.text-center { text-align: center; }