/* roulang page: index */
/* ==================== 设计变量 ==================== */
        :root {
            --color-primary: #0b1e3d;
            --color-primary-light: #132d54;
            --color-accent: #d4a030;
            --color-accent-hover: #c08c20;
            --color-cta: #e8941a;
            --color-cta-hover: #d07d10;
            --color-bg: #f4f5f7;
            --color-white: #ffffff;
            --color-card: #ffffff;
            --color-text: #1a1d24;
            --color-text-secondary: #5a5f6b;
            --color-text-muted: #8b9099;
            --color-border: #e2e5ea;
            --color-border-light: #eef0f3;
            --color-success: #1e7e34;
            --color-danger: #d93030;
            --color-live: #e53935;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
            --shadow-xl: 0 16px 48px rgba(0,0,0,0.16);
            --transition-fast: 0.15s ease;
            --transition-normal: 0.25s ease;
            --transition-slow: 0.35s ease;
            --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --max-width: 1200px;
            --nav-height: 68px;
            --section-gap: 72px;
        }

        /* ==================== 基础 Reset ==================== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
        body {
            font-family: var(--font-family);
            background: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            min-height: 100vh;
            overflow-x: hidden;
        }
        a { text-decoration: none; color: inherit; transition: color var(--transition-fast); }
        a:hover { color: var(--color-accent); }
        img { max-width: 100%; height: auto; display: block; }
        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: 1.3; font-weight: 700; color: var(--color-text); }
        h1 { font-size: 2.6rem; letter-spacing: -0.02em; }
        h2 { font-size: 2rem; letter-spacing: -0.01em; }
        h3 { font-size: 1.35rem; }
        h4 { font-size: 1.15rem; }
        p { color: var(--color-text-secondary); }

        /* ==================== 容器 ==================== */
        .container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
        .container--narrow { max-width: 900px; }
        .container--wide { max-width: 1320px; }

        /* ==================== Header / 导航 ==================== */
        .site-header {
            position: sticky; top: 0; z-index: 1000;
            background: var(--color-white);
            border-bottom: 1px solid var(--color-border-light);
            box-shadow: var(--shadow-sm);
            height: var(--nav-height);
            display: flex; align-items: center;
            transition: box-shadow var(--transition-normal);
        }
        .site-header.scrolled { box-shadow: var(--shadow-md); }
        .header-inner {
            display: flex; align-items: center; justify-content: space-between;
            width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
            height: 100%;
        }
        .header-logo {
            display: flex; align-items: center; gap: 10px;
            font-weight: 800; font-size: 1.25rem; color: var(--color-primary);
            letter-spacing: -0.01em; white-space: nowrap;
            flex-shrink: 0;
        }
        .header-logo i { font-size: 1.5rem; color: var(--color-accent); }
        .header-logo span { background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .header-nav { display: flex; align-items: center; gap: 6px; }
        .header-nav a {
            display: inline-flex; align-items: center; padding: 8px 16px;
            border-radius: var(--radius-sm); font-weight: 500; font-size: 0.95rem;
            color: var(--color-text-secondary); transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .header-nav a:hover { color: var(--color-primary); background: #f0f2f6; }
        .header-nav a.active { color: var(--color-primary); background: #eef1f7; font-weight: 600; }
        .header-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
        .header-search {
            display: flex; align-items: center; background: #f5f6f8;
            border-radius: 24px; padding: 8px 16px; gap: 8px;
            border: 1px solid transparent; transition: all var(--transition-fast);
            font-size: 0.9rem; color: var(--color-text-secondary);
        }
        .header-search:hover { border-color: var(--color-border); background: #fff; }
        .header-search input {
            border: none; background: transparent; outline: none;
            font-size: 0.9rem; width: 140px; color: var(--color-text);
        }
        .header-search input::placeholder { color: var(--color-text-muted); }
        .header-search i { color: var(--color-text-muted); font-size: 0.9rem; }
        .btn-header-cta {
            display: inline-flex; align-items: center; gap: 6px;
            background: var(--color-cta); color: #fff;
            border-radius: 24px; padding: 10px 20px; font-weight: 600;
            font-size: 0.9rem; white-space: nowrap;
            transition: all var(--transition-fast);
            box-shadow: 0 2px 8px rgba(232,148,26,0.3);
        }
        .btn-header-cta:hover { background: var(--color-cta-hover); color: #fff; box-shadow: 0 4px 14px rgba(232,148,26,0.4); transform: translateY(-1px); }
        .mobile-toggle {
            display: none; font-size: 1.4rem; color: var(--color-text);
            cursor: pointer; padding: 6px; border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }
        .mobile-toggle:hover { background: #f0f2f6; }
        @media (max-width: 1024px) {
            .header-nav { display: none; }
            .header-search { display: none; }
            .mobile-toggle { display: block; }
            .header-actions .btn-header-cta { font-size: 0.82rem; padding: 8px 14px; }
        }
        @media (max-width: 520px) {
            .header-logo { font-size: 1rem; }
            .header-logo i { font-size: 1.2rem; }
            .header-actions .btn-header-cta { font-size: 0.75rem; padding: 7px 12px; }
            .header-inner { padding: 0 14px; }
        }

        /* 移动端菜单面板 */
        .mobile-menu {
            display: none; position: fixed; top: var(--nav-height); left: 0; right: 0; bottom: 0;
            background: var(--color-white); z-index: 999; flex-direction: column;
            padding: 20px 24px; gap: 4px; overflow-y: auto;
            border-top: 1px solid var(--color-border-light);
        }
        .mobile-menu.open { display: flex; }
        .mobile-menu a {
            display: block; padding: 14px 16px; border-radius: var(--radius-md);
            font-weight: 500; font-size: 1.05rem; color: var(--color-text-secondary);
            transition: all var(--transition-fast);
        }
        .mobile-menu a:hover, .mobile-menu a.active { background: #f0f3f8; color: var(--color-primary); }
        .mobile-menu .mobile-search {
            display: flex; align-items: center; background: #f5f6f8;
            border-radius: 24px; padding: 12px 18px; gap: 10px;
            margin-top: 8px; border: 1px solid var(--color-border-light);
        }
        .mobile-menu .mobile-search input { border: none; background: transparent; outline: none; flex: 1; font-size: 0.95rem; color: var(--color-text); }
        .mobile-menu .mobile-search i { color: var(--color-text-muted); }

        /* ==================== Hero 首屏 ==================== */
        .hero {
            background: linear-gradient(160deg, #060e1c 0%, #0b1e3d 35%, #0f284f 65%, #0a1830 100%);
            color: #fff; padding: 80px 0 90px;
            position: relative; overflow: hidden;
        }
        .hero::before {
            content: ''; position: absolute; top: -50%; right: -20%;
            width: 700px; height: 700px;
            background: radial-gradient(circle, rgba(212,160,48,0.12) 0%, transparent 70%);
            border-radius: 50%; pointer-events: none;
        }
        .hero::after {
            content: ''; position: absolute; bottom: -30%; left: -15%;
            width: 500px; height: 500px;
            background: radial-gradient(circle, rgba(212,160,48,0.07) 0%, transparent 70%);
            border-radius: 50%; pointer-events: none;
        }
        .hero-inner { position: relative; z-index: 2; display: flex; align-items: center; gap: 50px; }
        .hero-content { flex: 1; }
        .hero-badge {
            display: inline-flex; align-items: center; gap: 8px;
            background: rgba(212,160,48,0.18); color: #f0d478;
            border-radius: 24px; padding: 7px 18px; font-size: 0.88rem;
            font-weight: 600; margin-bottom: 20px;
            border: 1px solid rgba(212,160,48,0.3);
        }
        .hero-badge .live-dot {
            width: 8px; height: 8px; background: #ff3b3b;
            border-radius: 50%; animation: pulse-dot 1.5s infinite;
        }
        @keyframes pulse-dot {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.5; transform: scale(1.6); }
        }
        .hero-title { font-size: 3rem; font-weight: 800; color: #fff; line-height: 1.2; margin-bottom: 16px; letter-spacing: -0.02em; }
        .hero-title .accent { color: #f0c850; }
        .hero-desc { font-size: 1.15rem; color: #bcc5d4; max-width: 540px; margin-bottom: 28px; line-height: 1.6; }
        .hero-buttons { display: flex; gap: 14px; flex-wrap: wrap; }
        .btn-hero-primary {
            display: inline-flex; align-items: center; gap: 8px;
            background: var(--color-cta); color: #fff; font-weight: 700;
            padding: 14px 28px; border-radius: 28px; font-size: 1rem;
            transition: all var(--transition-normal);
            box-shadow: 0 4px 18px rgba(232,148,26,0.4);
        }
        .btn-hero-primary:hover { background: #f0a028; color: #fff; transform: translateY(-2px); box-shadow: 0 8px 28px rgba(232,148,26,0.5); }
        .btn-hero-secondary {
            display: inline-flex; align-items: center; gap: 8px;
            background: transparent; color: #fff; font-weight: 600;
            padding: 14px 28px; border-radius: 28px; font-size: 1rem;
            border: 2px solid rgba(255,255,255,0.35);
            transition: all var(--transition-normal);
        }
        .btn-hero-secondary:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.6); color: #fff; }
        .hero-visual {
            flex: 0 0 380px; display: flex; align-items: center; justify-content: center;
        }
        .hero-card {
            background: rgba(255,255,255,0.06); border-radius: var(--radius-xl);
            padding: 28px 24px; border: 1px solid rgba(255,255,255,0.1);
            backdrop-filter: blur(4px); text-align: center;
            box-shadow: 0 8px 40px rgba(0,0,0,0.3);
        }
        .hero-card .match-teams {
            display: flex; align-items: center; justify-content: center; gap: 16px;
            font-size: 1.5rem; font-weight: 700; color: #fff;
        }
        .hero-card .match-teams span { font-size: 2.2rem; }
        .hero-card .match-score {
            font-size: 2.8rem; font-weight: 800; color: #f0c850;
            margin: 6px 0; letter-spacing: 0.04em;
        }
        .hero-card .match-info { font-size: 0.85rem; color: #bcc5d4; }
        .hero-card .match-badge {
            display: inline-block; background: #e53935; color: #fff;
            padding: 3px 12px; border-radius: 12px; font-size: 0.78rem;
            font-weight: 600; margin-top: 8px; animation: pulse-badge 2s infinite;
        }
        @keyframes pulse-badge {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.7; }
        }
        @media (max-width: 1024px) {
            .hero-inner { flex-direction: column; text-align: center; gap: 36px; }
            .hero-desc { margin: 0 auto 28px; }
            .hero-buttons { justify-content: center; }
            .hero-visual { flex: 0 0 auto; width: 100%; max-width: 360px; }
            .hero-title { font-size: 2.3rem; }
        }
        @media (max-width: 520px) {
            .hero { padding: 50px 0 55px; }
            .hero-title { font-size: 1.7rem; }
            .hero-desc { font-size: 0.95rem; }
            .btn-hero-primary, .btn-hero-secondary { padding: 12px 22px; font-size: 0.9rem; }
            .hero-card .match-score { font-size: 2.2rem; }
            .hero-card .match-teams { font-size: 1.2rem; }
            .hero-card .match-teams span { font-size: 1.7rem; }
        }

        /* ==================== 板块通用 ==================== */
        .section { padding: var(--section-gap) 0; }
        .section--alt { background: var(--color-white); }
        .section--dark { background: var(--color-primary); color: #fff; }
        .section-header { text-align: center; margin-bottom: 44px; }
        .section-header h2 { margin-bottom: 10px; }
        .section-header p { max-width: 560px; margin: 0 auto; font-size: 1rem; color: var(--color-text-muted); }
        .section--dark .section-header h2 { color: #fff; }
        .section--dark .section-header p { color: #bcc5d4; }
        .section-label {
            display: inline-block; font-size: 0.82rem; font-weight: 700;
            text-transform: uppercase; letter-spacing: 0.06em;
            color: var(--color-accent); margin-bottom: 8px;
        }

        /* ==================== 核心优势卡片 ==================== */
        .features-grid {
            display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px;
        }
        .feature-card {
            background: var(--color-card); border-radius: var(--radius-lg);
            padding: 30px 24px; text-align: center;
            box-shadow: var(--shadow-sm); border: 1px solid var(--color-border-light);
            transition: all var(--transition-normal); position: relative;
        }
        .feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
        .feature-icon {
            display: inline-flex; align-items: center; justify-content: center;
            width: 56px; height: 56px; border-radius: var(--radius-md);
            background: #f0f4fa; margin-bottom: 16px; font-size: 1.5rem;
            color: var(--color-primary); transition: all var(--transition-normal);
        }
        .feature-card:hover .feature-icon { background: var(--color-primary); color: #fff; transform: scale(1.08); }
        .feature-card h4 { margin-bottom: 8px; }
        .feature-card p { font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.5; }
        @media (max-width: 1024px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
        }
        @media (max-width: 520px) {
            .features-grid { grid-template-columns: 1fr; gap: 12px; }
            .feature-card { padding: 22px 18px; }
        }

        /* ==================== 热门直播卡片 ==================== */
        .live-grid {
            display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
        }
        .live-card {
            background: var(--color-card); border-radius: var(--radius-lg);
            overflow: hidden; box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-normal);
        }
        .live-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
        .live-card-thumb {
            position: relative; height: 160px; background: linear-gradient(135deg, #1a3050, #0f2440);
            display: flex; align-items: center; justify-content: center;
        }
        .live-card-thumb .match-display {
            display: flex; align-items: center; gap: 12px; color: #fff;
            font-weight: 700; font-size: 1.1rem;
        }
        .live-card-thumb .match-display .flag { font-size: 2rem; }
        .live-badge {
            position: absolute; top: 12px; left: 12px;
            background: #e53935; color: #fff; padding: 4px 10px;
            border-radius: 12px; font-size: 0.72rem; font-weight: 700;
            animation: pulse-badge 2s infinite;
        }
        .live-card-body { padding: 18px; }
        .live-card-body h4 { font-size: 1rem; margin-bottom: 6px; }
        .live-card-body .match-meta { font-size: 0.82rem; color: var(--color-text-muted); display: flex; gap: 14px; }
        .live-card-body .match-meta i { color: var(--color-accent); }
        .live-card-footer { padding: 12px 18px; border-top: 1px solid var(--color-border-light); display: flex; justify-content: space-between; align-items: center; }
        .btn-watch {
            background: var(--color-primary); color: #fff; padding: 7px 16px;
            border-radius: 18px; font-size: 0.82rem; font-weight: 600;
            transition: all var(--transition-fast);
        }
        .btn-watch:hover { background: var(--color-accent); color: #fff; }
        .viewer-count { font-size: 0.78rem; color: var(--color-text-muted); }
        @media (max-width: 1024px) {
            .live-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 600px) {
            .live-grid { grid-template-columns: 1fr; }
        }

        /* ==================== 赛程时间线 ==================== */
        .schedule-list { display: flex; flex-direction: column; gap: 12px; }
        .schedule-item {
            display: flex; align-items: center; gap: 20px;
            background: var(--color-card); border-radius: var(--radius-md);
            padding: 18px 22px; box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-fast);
        }
        .schedule-item:hover { box-shadow: var(--shadow-md); border-color: var(--color-border); }
        .schedule-date {
            flex: 0 0 80px; text-align: center; font-weight: 700;
            color: var(--color-primary); font-size: 1rem;
        }
        .schedule-date span { display: block; font-size: 0.75rem; color: var(--color-text-muted); font-weight: 400; }
        .schedule-teams { flex: 1; display: flex; align-items: center; gap: 10px; font-weight: 600; }
        .schedule-teams .vs { color: var(--color-text-muted); font-weight: 400; font-size: 0.85rem; }
        .schedule-time { flex: 0 0 90px; text-align: right; font-weight: 600; color: var(--color-accent); font-size: 0.9rem; }
        .schedule-status {
            flex: 0 0 80px; text-align: center; font-size: 0.78rem; font-weight: 600;
            padding: 4px 10px; border-radius: 12px;
        }
        .schedule-status.upcoming { background: #e8f0fe; color: #1a56c4; }
        .schedule-status.live { background: #ffe8e8; color: #c41a1a; }
        @media (max-width: 768px) {
            .schedule-item { flex-wrap: wrap; gap: 10px; padding: 14px 16px; }
            .schedule-date { flex: 0 0 60px; font-size: 0.85rem; }
            .schedule-teams { flex: 1 1 100%; order: 3; }
            .schedule-time { flex: 0 0 auto; }
            .schedule-status { flex: 0 0 auto; }
        }

        /* ==================== 数据统计 ==================== */
        .stats-grid {
            display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
        }
        .stat-card {
            background: rgba(255,255,255,0.06); border-radius: var(--radius-lg);
            padding: 28px 20px; text-align: center;
            border: 1px solid rgba(255,255,255,0.1);
            transition: all var(--transition-normal);
        }
        .stat-card:hover { background: rgba(255,255,255,0.1); transform: translateY(-3px); }
        .stat-number {
            font-size: 2.6rem; font-weight: 800; color: #f0c850;
            letter-spacing: -0.02em; line-height: 1;
        }
        .stat-label { font-size: 0.9rem; color: #bcc5d4; margin-top: 6px; }
        @media (max-width: 768px) {
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
            .stat-number { font-size: 2rem; }
        }
        @media (max-width: 400px) {
            .stats-grid { grid-template-columns: 1fr; }
        }

        /* ==================== 观看指南 ==================== */
        .guide-steps {
            display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
            position: relative;
        }
        .guide-step {
            text-align: center; position: relative; z-index: 1;
            background: var(--color-card); border-radius: var(--radius-lg);
            padding: 30px 20px; box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-normal);
        }
        .guide-step:hover { box-shadow: var(--shadow-md); }
        .step-number {
            display: inline-flex; align-items: center; justify-content: center;
            width: 44px; height: 44px; border-radius: 50%;
            background: var(--color-primary); color: #fff; font-weight: 800;
            font-size: 1.2rem; margin-bottom: 14px;
        }
        .guide-step h4 { margin-bottom: 6px; }
        .guide-step p { font-size: 0.88rem; color: var(--color-text-muted); }
        @media (max-width: 768px) {
            .guide-steps { grid-template-columns: 1fr; gap: 14px; max-width: 400px; margin: 0 auto; }
        }

        /* ==================== FAQ ==================== */
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 10px; }
        .faq-item {
            background: var(--color-card); border-radius: var(--radius-md);
            border: 1px solid var(--color-border-light);
            overflow: hidden; transition: all var(--transition-fast);
        }
        .faq-item:hover { border-color: var(--color-border); }
        .faq-question {
            width: 100%; display: flex; align-items: center; justify-content: space-between;
            padding: 18px 22px; font-weight: 600; font-size: 0.98rem;
            text-align: left; color: var(--color-text); gap: 12px;
            transition: background var(--transition-fast);
        }
        .faq-question:hover { background: #fafbfc; }
        .faq-question i { transition: transform var(--transition-normal); color: var(--color-text-muted); font-size: 0.85rem; }
        .faq-item.open .faq-question i { transform: rotate(180deg); color: var(--color-accent); }
        .faq-answer {
            max-height: 0; overflow: hidden; transition: max-height var(--transition-slow), padding var(--transition-slow);
            padding: 0 22px;
        }
        .faq-item.open .faq-answer { max-height: 300px; padding: 0 22px 18px; }
        .faq-answer p { font-size: 0.9rem; color: var(--color-text-secondary); line-height: 1.6; }

        /* ==================== CTA 横幅 ==================== */
        .cta-banner {
            background: linear-gradient(135deg, var(--color-primary), #1a3a60);
            border-radius: var(--radius-xl); padding: 50px 40px;
            text-align: center; color: #fff;
            box-shadow: var(--shadow-xl);
        }
        .cta-banner h2 { color: #fff; margin-bottom: 10px; font-size: 1.8rem; }
        .cta-banner p { color: #c5d0df; max-width: 500px; margin: 0 auto 24px; }
        .btn-cta-large {
            display: inline-flex; align-items: center; gap: 8px;
            background: var(--color-cta); color: #fff; font-weight: 700;
            padding: 15px 32px; border-radius: 28px; font-size: 1.05rem;
            transition: all var(--transition-normal);
            box-shadow: 0 4px 20px rgba(232,148,26,0.35);
        }
        .btn-cta-large:hover { background: #f0a028; color: #fff; transform: translateY(-2px); box-shadow: 0 8px 30px rgba(232,148,26,0.5); }
        @media (max-width: 520px) {
            .cta-banner { padding: 32px 20px; }
            .cta-banner h2 { font-size: 1.4rem; }
        }

        /* ==================== 页脚 ==================== */
        .site-footer {
            background: #0a1525; color: #bcc5d4; padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 30px; margin-bottom: 32px;
        }
        .footer-brand { font-weight: 800; font-size: 1.2rem; color: #fff; margin-bottom: 10px; }
        .footer-desc { font-size: 0.88rem; color: #8895a8; line-height: 1.5; max-width: 280px; }
        .footer-col h4 { color: #fff; font-size: 0.9rem; margin-bottom: 12px; font-weight: 600; }
        .footer-col a { display: block; font-size: 0.85rem; color: #8895a8; padding: 4px 0; transition: color var(--transition-fast); }
        .footer-col a:hover { color: #f0c850; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 18px; text-align: center; font-size: 0.8rem;
            color: #667080;
        }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
            .footer-brand-col { grid-column: 1 / -1; }
        }
        @media (max-width: 400px) {
            .footer-grid { grid-template-columns: 1fr; }
        }

        /* ==================== 通用按钮与标签 ==================== */
        .text-accent { color: var(--color-accent); }
        .text-muted { color: var(--color-text-muted); }
        .mt-8 { margin-top: 8px; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }
        .mb-8 { margin-bottom: 8px; }
        .mb-16 { margin-bottom: 16px; }
        .mb-24 { margin-bottom: 24px; }
        .text-center { text-align: center; }

        /* 覆盖 Foundation 默认样式 */
        .button {
            font-family: var(--font-family); font-weight: 600;
            border-radius: 24px; transition: all var(--transition-fast);
        }
        .button:hover { transform: translateY(-1px); }
        a:focus, button:focus, input:focus {
            outline: 2px solid var(--color-accent); outline-offset: 2px;
        }

        /* ==================== 回顶按钮 ==================== */
        .back-to-top {
            position: fixed; bottom: 28px; right: 28px; z-index: 900;
            width: 44px; height: 44px; border-radius: 50%;
            background: var(--color-primary); color: #fff;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.1rem; box-shadow: var(--shadow-lg);
            opacity: 0; transform: translateY(20px); pointer-events: none;
            transition: all var(--transition-normal); cursor: pointer;
        }
        .back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
        .back-to-top:hover { background: var(--color-accent); transform: translateY(-3px); }

        /* ==================== 分隔线 ==================== */
        .divider { width: 60px; height: 4px; background: var(--color-accent); border-radius: 2px; margin: 0 auto 20px; }