:root {
        --primary: #64748b;
        --accent: #94a3b8;
        --bg: #f1f5f9;
        --text: #1e293b;
        --white: #ffffff;
        --shadow-heavy: 0 10px 30px -5px rgba(30, 41, 59, 0.25), 0 4px 10px rgba(30, 41, 59, 0.15);
        --shadow-light: 0 4px 12px rgba(30, 41, 59, 0.08);
        --radius-lg: 18px;
        --radius-md: 12px;
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body {
        font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        background-color: var(--bg);
        color: var(--text);
        line-height: 1.6;
        background-image: radial-gradient(circle, rgba(100, 116, 139, 0.12) 1px, transparent 1px);
        background-size: 24px 24px;
    }
    a { text-decoration: none; color: inherit; }
    .navbar-custom {
        background: rgba(255,255,255,0.85);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid rgba(100,116,139,0.2);
        padding: 14px 0;
        box-shadow: 0 2px 10px rgba(30,41,59,0.06);
        z-index: 1000;
    }
    .navbar-brand {
        font-weight: 900;
        font-size: 1.5rem;
        letter-spacing: -0.02em;
        color: var(--text);
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .navbar-brand i { color: var(--primary); font-size: 1.6rem; }
    .nav-link-custom {
        font-weight: 600;
        color: var(--text) !important;
        margin: 0 12px;
        font-size: 0.95rem;
        transition: color 0.2s;
        position: relative;
    }
    .nav-link-custom:hover { color: var(--primary) !important; }
    .hero-section {
        padding: 110px 0 70px;
        text-align: center;
        position: relative;
        background: linear-gradient(180deg, rgba(255,255,255,0.5) 0%, var(--bg) 100%);
        border-bottom: 1px solid rgba(100,116,139,0.15);
    }
    .hero-section::before {
        content: '';
        position: absolute;
        top: 0; left: 0; right: 0;
        height: 4px;
        background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary));
    }
    .hero-badge {
        display: inline-block;
        background: var(--primary);
        color: white;
        font-size: 0.8rem;
        font-weight: 700;
        padding: 6px 16px;
        border-radius: 30px;
        margin-bottom: 20px;
        letter-spacing: 0.05em;
        box-shadow: 0 4px 12px rgba(100,116,139,0.3);
    }
    .hero-title {
        font-size: 3.2rem;
        font-weight: 900;
        line-height: 1.15;
        letter-spacing: -0.03em;
        color: var(--text);
        max-width: 800px;
        margin: 0 auto 20px;
        text-shadow: 0 2px 4px rgba(30,41,59,0.08);
    }
    .hero-subtitle {
        font-size: 1.2rem;
        color: var(--primary);
        max-width: 600px;
        margin: 0 auto 40px;
        font-weight: 400;
        opacity: 0.9;
    }
    .hero-btn-group { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
    .btn-hero-primary {
        background: var(--primary);
        color: white;
        border: none;
        padding: 14px 34px;
        border-radius: 50px;
        font-weight: 700;
        font-size: 1rem;
        box-shadow: 0 8px 20px rgba(100,116,139,0.35);
        transition: all 0.3s ease;
    }
    .btn-hero-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(100,116,139,0.45); color: white; }
    .btn-hero-secondary {
        background: white;
        color: var(--text);
        border: 2px solid var(--accent);
        padding: 12px 32px;
        border-radius: 50px;
        font-weight: 600;
        font-size: 1rem;
        transition: all 0.3s ease;
    }
    .btn-hero-secondary:hover { border-color: var(--primary); color: var(--primary); background: #f8fafc; }
    .section-block { padding: 80px 0; position: relative; }
    .section-heading {
        font-size: 2rem;
        font-weight: 800;
        letter-spacing: -0.02em;
        margin-bottom: 12px;
        color: var(--text);
        display: flex;
        align-items: center;
        gap: 12px;
    }
    .section-heading i { color: var(--primary); font-size: 1.8rem; }
    .section-subheading { color: var(--primary); font-size: 1rem; margin-bottom: 50px; max-width: 600px; }
    .feature-card {
        background: white;
        border-radius: var(--radius-lg);
        padding: 36px 28px;
        height: 100%;
        box-shadow: var(--shadow-heavy);
        transition: transform 0.3s, box-shadow 0.3s;
        border: 1px solid rgba(100,116,139,0.1);
        position: relative;
        overflow: hidden;
    }
    .feature-card::after {
        content: '';
        position: absolute;
        top: 0; left: 0; right: 0;
        height: 3px;
        background: linear-gradient(90deg, var(--primary), var(--accent));
        opacity: 0;
        transition: opacity 0.3s;
    }
    .feature-card:hover { transform: translateY(-6px); box-shadow: 0 16px 36px rgba(30,41,59,0.18); }
    .feature-card:hover::after { opacity: 1; }
    .feature-icon {
        width: 64px; height: 64px;
        background: linear-gradient(145deg, var(--primary), var(--accent));
        border-radius: 16px;
        display: flex; align-items: center; justify-content: center;
        font-size: 1.6rem;
        color: white;
        margin-bottom: 20px;
        box-shadow: 0 6px 14px rgba(100,116,139,0.3);
    }
    .feature-title { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; color: var(--text); }
    .feature-desc { font-size: 0.9rem; color: #475569; line-height: 1.6; }
    .faq-wrapper { max-width: 850px; margin: 0 auto; }
    .accordion-custom { background: white; border-radius: var(--radius-md); box-shadow: var(--shadow-light); border: 1px solid rgba(100,116,139,0.12); margin-bottom: 12px; overflow: hidden; }
    .accordion-custom-header {
        padding: 20px 24px;
        font-weight: 700;
        font-size: 1rem;
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
        background: white;
        transition: background 0.2s;
        color: var(--text);
    }
    .accordion-custom-header:hover { background: #f8fafc; }
    .accordion-custom-header i { color: var(--primary); font-size: 0.9rem; transition: transform 0.3s; }
    .accordion-custom-body {
        padding: 0 24px;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease, padding 0.3s;
        color: #475569;
        font-size: 0.95rem;
        line-height: 1.7;
        background: #fcfdfe;
    }
    .accordion-custom.active .accordion-custom-body { max-height: 300px; padding: 0 24px 20px; }
    .accordion-custom.active .accordion-custom-header i { transform: rotate(180deg); }
    .about-section { background: white; border-top: 1px solid rgba(100,116,139,0.1); border-bottom: 1px solid rgba(100,116,139,0.1); }
    .about-content { max-width: 850px; margin: 0 auto; }
    .about-text { color: #334155; font-size: 1rem; line-height: 1.9; }
    .about-text strong { color: var(--text); font-weight: 700; }
    .cta-section { padding: 80px 0; text-align: center; }
    .cta-box {
        background: linear-gradient(135deg, var(--primary) 0%, #7c8ba1 100%);
        border-radius: 24px;
        padding: 60px 40px;
        color: white;
        box-shadow: 0 20px 50px rgba(100,116,139,0.35);
        position: relative;
        overflow: hidden;
    }
    .cta-box::before {
        content: '';
        position: absolute;
        top: -50%; right: -30%;
        width: 300px; height: 300px;
        background: rgba(255,255,255,0.1);
        border-radius: 50%;
    }
    .cta-box h2 { font-size: 2rem; font-weight: 800; margin-bottom: 16px; }
    .cta-box p { font-size: 1.1rem; opacity: 0.9; margin-bottom: 30px; }
    .btn-cta-white {
        background: white;
        color: var(--primary);
        border: none;
        padding: 14px 40px;
        border-radius: 50px;
        font-weight: 800;
        font-size: 1rem;
        transition: all 0.3s;
        box-shadow: 0 8px 20px rgba(0,0,0,0.15);
    }
    .btn-cta-white:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(0,0,0,0.2); color: var(--primary); }
    .friend-links-section { padding: 50px 0 30px; border-top: 1px solid rgba(100,116,139,0.12); background: white; }
    .friend-links-title { font-size: 0.9rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--primary); margin-bottom: 20px; text-align: center; }
    .friend-links-content { text-align: center; color: var(--accent); font-size: 0.9rem; }
    .site-footer {
        background: #e2e8f0;
        color: #475569;
        padding: 30px 0;
        text-align: center;
        font-size: 0.9rem;
        border-top: 1px solid rgba(100,116,139,0.2);
    }
    .site-footer .footer-brand { font-weight: 900; color: var(--text); font-size: 1.2rem; margin-bottom: 8px; display: block; }
    .site-footer .footer-links { margin-top: 12px; }
    .site-footer .footer-links a { margin: 0 12px; color: #64748b; font-weight: 500; }
    .site-footer .footer-links a:hover { color: var(--primary); }
    .back-to-top {
        position: fixed;
        bottom: 30px;
        right: 30px;
        width: 48px;
        height: 48px;
        background: var(--primary);
        color: white;
        border: none;
        border-radius: 50%;
        box-shadow: 0 6px 16px rgba(100,116,139,0.4);
        font-size: 1.1rem;
        cursor: pointer;
        opacity: 0;
        visibility: hidden;
        transition: all 0.4s;
        z-index: 999;
    }
    .back-to-top.show { opacity: 1; visibility: visible; }
    .back-to-top:hover { transform: translateY(-4px); background: #55667c; }
    .scroll-reveal {
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.8s cubic-bezier(0.2, 0.8, 0.3, 1), transform 0.8s cubic-bezier(0.2, 0.8, 0.3, 1);
    }
    .scroll-reveal.revealed { opacity: 1; transform: translateY(0); }
    .navbar-toggler { border: 1px solid var(--accent); color: var(--primary); }
    .navbar-toggler:focus { box-shadow: none; }
    @media (max-width: 768px) {
        .hero-title { font-size: 2.2rem; }
        .hero-section { padding: 80px 0 50px; }
        .section-block { padding: 50px 0; }
        .cta-box { padding: 40px 20px; }
        .cta-box h2 { font-size: 1.6rem; }
        .navbar-nav { padding-top: 10px; }
        .nav-link-custom { margin: 5px 0; }
    }

/* --- 子页面追加 --- */
/* 页面局部微调 */
        .about-hero {
            padding-top: 6rem;
            padding-bottom: 3rem;
        }
.section-block.about-block {
            margin-top: 2rem;
        }
.about-text p {
            line-height: 1.9;
            margin-bottom: 1.2rem;
            color: var(--text);
        }
.stat-badge {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            background: rgba(100, 116, 139, .12);
            border: 1px solid rgba(100, 116, 139, .25);
            color: var(--primary);
            border-radius: 50px;
            padding: .45rem 1.1rem;
            font-size: .9rem;
            font-weight: 600;
        }
.about-extra-card {
            background: var(--white);
            border-radius: var(--radius-md);
            padding: 1.8rem 1.6rem;
            box-shadow: var(--shadow-light);
            border-left: 4px solid var(--primary);
            height: 100%;
            transition: transform .25s ease, box-shadow .25s ease;
        }
.about-extra-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-heavy);
        }
.about-extra-card .icon-circle {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: rgba(100, 116, 139, .15);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--primary);
            margin-bottom: 1rem;
        }
.about-extra-card h4 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: .7rem;
        }
.about-extra-card p {
            font-size: .95rem;
            color: var(--text);
            opacity: .85;
            line-height: 1.65;
        }
.timeline-item {
            position: relative;
            padding-left: 2rem;
            margin-bottom: 2rem;
        }
.timeline-item::before {
            content: '';
            position: absolute;
            left: 6px;
            top: 6px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--primary);
            border: 3px solid rgba(100, 116, 139, .2);
        }
.timeline-item::after {
            content: '';
            position: absolute;
            left: 11px;
            top: 24px;
            bottom: -20px;
            width: 2px;
            background: rgba(100, 116, 139, .15);
        }
.timeline-item:last-child::after {
            display: none;
        }
.timeline-item .year {
            font-size: .85rem;
            font-weight: 700;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: .5px;
            margin-bottom: .3rem;
        }
.timeline-item h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: .5rem;
        }
.timeline-item p {
            font-size: .95rem;
            color: var(--text);
            opacity: .85;
            line-height: 1.6;
        }

/* --- 子页面追加 --- */
.disclaimer-section {
            padding: 60px 0;
        }
.disclaimer-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-light);
            margin-bottom: 30px;
        }
.disclaimer-card h2 {
            color: var(--primary);
            font-weight: 700;
            font-size: 1.5rem;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
.disclaimer-card h2 i {
            color: var(--accent);
            font-size: 1.3rem;
        }
.disclaimer-card p, .disclaimer-card li {
            color: var(--text);
            line-height: 1.8;
            font-size: 0.95rem;
        }
.disclaimer-card ul {
            padding-left: 20px;
        }
.disclaimer-card ul li {
            margin-bottom: 8px;
        }
.disclaimer-card .highlight {
            background: rgba(100, 116, 139, 0.08);
            border-left: 4px solid var(--primary);
            padding: 16px 20px;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            margin: 20px 0;
        }
.disclaimer-card .highlight p {
            margin-bottom: 0;
            font-weight: 500;
        }
.disclaimer-date {
            color: var(--accent);
            font-size: 0.85rem;
            margin-top: 15px;
            display: block;
        }
.disclaimer-card {
                padding: 24px;
            }
.disclaimer-card h2 {
                font-size: 1.2rem;
            }

/* --- 子页面追加 --- */
/* 本页专属样式 */
        .privacy-hero {
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            padding: 4rem 0;
            text-align: center;
            color: var(--white);
        }
.privacy-hero h1 {
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: 1rem;
        }
.privacy-hero p {
            font-size: 1.1rem;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto;
        }
.privacy-content {
            padding: 4rem 0;
        }
.privacy-section {
            background: var(--white);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-light);
            padding: 2rem;
            margin-bottom: 2rem;
        }
.privacy-section h2 {
            color: var(--primary);
            font-weight: 700;
            font-size: 1.5rem;
            margin-bottom: 1.2rem;
            padding-bottom: 0.8rem;
            border-bottom: 2px solid var(--accent);
        }
.privacy-section h3 {
            color: var(--text);
            font-weight: 600;
            font-size: 1.1rem;
            margin: 1.5rem 0 0.8rem;
        }
.privacy-section p, .privacy-section li {
            color: var(--text);
            line-height: 1.8;
            font-size: 0.95rem;
        }
.privacy-section ul {
            padding-left: 1.5rem;
            margin-bottom: 1rem;
        }
.privacy-section ul li {
            margin-bottom: 0.5rem;
        }
.privacy-section .highlight-box {
            background: rgba(100, 116, 139, 0.08);
            border-left: 4px solid var(--primary);
            padding: 1rem 1.5rem;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            margin: 1.5rem 0;
        }
.privacy-section .highlight-box p {
            margin: 0;
        }
.last-updated {
            text-align: center;
            color: var(--accent);
            font-size: 0.9rem;
            margin-top: 2rem;
        }
.privacy-hero h1 {
                font-size: 1.8rem;
            }
.privacy-section {
                padding: 1.5rem;
            }

/* --- 子页面追加 --- */
/* 排名页专属样式 */
        .rank-hero {
            padding: 80px 0 50px;
            background: linear-gradient(135deg, var(--bg) 0%, #e2e8f0 100%);
            border-bottom: 1px solid rgba(100, 116, 139, 0.1);
        }
.rank-tabs {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            margin-bottom: 40px;
            border-bottom: 2px solid rgba(100, 116, 139, 0.15);
            padding-bottom: 0;
        }
.rank-tab-btn {
            padding: 12px 24px;
            border: none;
            background: transparent;
            color: var(--text);
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            position: relative;
            transition: all 0.3s ease;
            border-radius: var(--radius-md) var(--radius-md) 0 0;
        }
.rank-tab-btn:hover {
            color: var(--primary);
            background: rgba(100, 116, 139, 0.08);
        }
.rank-tab-btn.active {
            color: var(--primary);
            background: rgba(100, 116, 139, 0.1);
        }
.rank-tab-btn.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--primary);
            border-radius: 3px 3px 0 0;
        }
.rank-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 24px;
            margin-bottom: 20px;
            box-shadow: var(--shadow-light);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: 1px solid rgba(100, 116, 139, 0.08);
        }
.rank-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-heavy);
        }
.rank-number {
            font-size: 28px;
            font-weight: 800;
            color: var(--primary);
            min-width: 60px;
            text-align: center;
            line-height: 1;
        }
.rank-number.top-3 {
            color: #f59e0b;
            font-size: 36px;
        }
.rank-content {
            flex: 1;
            padding: 0 20px;
        }
.rank-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
        }
.rank-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-bottom: 8px;
        }
.rank-tag {
            background: rgba(100, 116, 139, 0.1);
            color: var(--primary);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 500;
        }
.rank-desc {
            color: #64748b;
            font-size: 14px;
            line-height: 1.6;
            margin-bottom: 0;
        }
.rank-stats {
            display: flex;
            gap: 20px;
            margin-top: 12px;
            color: var(--accent);
            font-size: 13px;
        }
.rank-stats i {
            margin-right: 4px;
            color: var(--primary);
        }
.rank-badge {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            white-space: nowrap;
            align-self: center;
        }
.rank-badge.hot {
            background: linear-gradient(135deg, #f59e0b, #f97316);
        }
.rank-badge.new {
            background: linear-gradient(135deg, #10b981, #059669);
        }
.rank-note {
            background: rgba(100, 116, 139, 0.05);
            border-left: 4px solid var(--primary);
            padding: 20px 24px;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            margin-top: 40px;
        }
.rank-note h3 {
            color: var(--text);
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
        }
.rank-note p {
            color: #64748b;
            font-size: 14px;
            line-height: 1.8;
            margin-bottom: 0;
        }
.rank-update {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(100, 116, 139, 0.1);
            color: var(--primary);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
        }
.rank-card {
                padding: 16px;
            }
.rank-number {
                font-size: 22px;
                min-width: 40px;
            }
.rank-number.top-3 {
                font-size: 28px;
            }
.rank-title {
                font-size: 16px;
            }
.rank-content {
                padding: 0 12px;
            }
.rank-stats {
                flex-wrap: wrap;
                gap: 10px;
            }
.rank-badge {
                display: none;
            }