:root {
    --primary: #64748b;
    --accent: #94a3b8;
    --bg: #f1f5f9;
    --text: #1e293b;
}
* {
    box-sizing: border-box;
    border-radius: 0 !important;
}
html {
    scroll-behavior: smooth;
}
body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    background-image: radial-gradient(#94a3b8 0.8px, transparent 0.8px);
    background-size: 24px 24px;
}
a {
    color: var(--primary);
    text-decoration: none;
}
a:hover {
    color: #1e293b;
}
.navbar {
    background: rgba(241, 245, 249, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 2px solid var(--text);
    padding: 0.8rem 1.5rem;
    transition: all 0.3s ease;
}
.navbar.scrolled {
    background: rgba(241, 245, 249, 0.75);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.navbar-brand {
    font-weight: 900;
    font-size: 1.5rem;
    letter-spacing: -0.02em;
    color: var(--text) !important;
}
.nav-link {
    font-weight: 600;
    color: var(--text) !important;
    margin: 0 0.4rem;
    padding: 0.3rem 0.6rem !important;
    border: 2px solid transparent;
}
.nav-link:hover {
    border-color: var(--text);
}
.navbar-toggler {
    border: 2px solid var(--text);
}
.hero {
    padding: 6rem 0 4rem;
    text-align: center;
}
.hero .display-4 {
    font-weight: 900;
    letter-spacing: -0.03em;
    margin-bottom: 1.2rem;
}
.hero .lead {
    max-width: 620px;
    margin: 0 auto 2rem;
    font-weight: 400;
}
.stat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin: 3rem 0;
}
.stat-item {
    border: 3px solid var(--text);
    background: rgba(255,255,255,0.7);
    padding: 1.5rem 1rem;
    box-shadow: 6px 6px 0 var(--accent);
}
.stat-number {
    font-size: 2.8rem;
    font-weight: 900;
    line-height: 1.2;
    color: var(--primary);
}
.stat-label {
    font-weight: 600;
    font-size: 0.9rem;
    margin-top: 0.3rem;
}
.section {
    padding: 4rem 0;
}
.section-title {
    font-weight: 800;
    font-size: 2rem;
    border-bottom: 3px solid var(--text);
    display: inline-block;
    padding-bottom: 0.3rem;
    margin-bottom: 2rem;
}
.steps-container {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}
.step-item {
    display: flex;
    gap: 1.2rem;
    align-items: flex-start;
    padding: 1.2rem;
    border: 2px solid var(--text);
    background: rgba(255,255,255,0.6);
}
.step-num {
    font-size: 2rem;
    font-weight: 900;
    color: var(--primary);
    line-height: 1;
    min-width: 3rem;
}
.step-content h5 {
    font-weight: 700;
}
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}
.feature-card {
    border: 2px solid var(--text);
    background: rgba(255,255,255,0.7);
    padding: 1.5rem;
    transition: all 0.2s ease;
}
.feature-card:hover {
    box-shadow: 6px 6px 0 var(--accent);
    transform: translate(-2px, -2px);
}
.feature-card i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 1rem;
}
.feature-card h4 {
    font-weight: 700;
    font-size: 1.2rem;
}
.feature-card p {
    font-size: 0.9rem;
}
.faq-item {
    border: 2px solid var(--text);
    background: rgba(255,255,255,0.6);
    margin-bottom: 1.2rem;
    padding: 1.2rem;
}
.faq-question {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
}
.faq-answer {
    font-size: 0.95rem;
}
.cta-section {
    border: 3px solid var(--text);
    background: var(--text);
    color: var(--bg);
    padding: 3rem 2rem;
    text-align: center;
}
.cta-section .btn {
    border: 2px solid var(--bg);
    background: transparent;
    color: var(--bg);
    font-weight: 700;
    padding: 0.6rem 1.8rem;
    margin: 0.3rem;
}
.cta-section .btn:hover {
    background: var(--bg);
    color: var(--text);
}
.friend-links {
    border-top: 3px solid var(--text);
    margin-top: 4rem;
    padding: 2rem 0 1rem;
}
.footer {
    border-top: 3px solid var(--text);
    padding: 2rem 0 3rem;
    margin-top: 2rem;
    background: rgba(255,255,255,0.5);
}
.back-to-top {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    width: 48px;
    height: 48px;
    background: var(--text);
    color: var(--bg);
    border: 2px solid var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 100;
}
.back-to-top.show {
    opacity: 1;
    visibility: visible;
}
.back-to-top:hover {
    background: var(--primary);
}
.posters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.2rem;
}
.poster-item {
    position: relative;
    border: 2px solid var(--text);
    background: var(--accent);
    aspect-ratio: 3/4;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: rgba(30,41,59,0.4);
}
.poster-play {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(30,41,59,0.5);
    opacity: 0;
    transition: opacity 0.3s;
    color: white;
    font-size: 3.5rem;
}
.poster-item:hover .poster-play {
    opacity: 1;
}
@media (max-width: 768px) {
    .hero .display-4 {
        font-size: 2rem;
    }
    .stat-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    .step-item {
        flex-direction: column;
    }
    .step-num {
        font-size: 1.5rem;
    }
}

/* --- 子页面追加 --- */
/* 本页专属微调,保持与站点风格一致 */
        .about-hero {
            background: linear-gradient(135deg, rgba(100,116,139,0.15) 0%, rgba(148,163,184,0.1) 50%, rgba(241,245,249,0.05) 100%);
            border-bottom: 1px solid rgba(100,116,139,0.2);
        }
.about-section {
            padding: 70px 0;
        }
.about-section-alt {
            background: rgba(148,163,184,0.08);
            border-top: 1px solid rgba(100,116,139,0.15);
            border-bottom: 1px solid rgba(100,116,139,0.15);
        }
.about-card {
            background: #ffffff;
            border: 1px solid rgba(100,116,139,0.2);
            border-radius: 12px;
            padding: 30px;
            height: 100%;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
.about-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 25px rgba(100,116,139,0.15);
        }
.about-card i {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 15px;
        }
.about-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
        }
.about-card p {
            font-size: 0.95rem;
            line-height: 1.7;
            color: #475569;
            margin: 0;
        }
.timeline-item {
            position: relative;
            padding-left: 30px;
            padding-bottom: 35px;
            border-left: 2px solid rgba(100,116,139,0.3);
        }
.timeline-item:last-child {
            border-left: 2px solid transparent;
            padding-bottom: 0;
        }
.timeline-item::before {
            content: '';
            position: absolute;
            left: -8px;
            top: 4px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--primary);
            border: 2px solid #fff;
            box-shadow: 0 0 0 2px var(--primary);
        }
.timeline-item h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
        }
.timeline-item p {
            font-size: 0.95rem;
            color: #475569;
            line-height: 1.7;
            margin: 0;
        }
.value-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
.value-list li {
            padding: 12px 0;
            border-bottom: 1px dashed rgba(100,116,139,0.2);
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 0.95rem;
            color: #475569;
            line-height: 1.6;
        }
.value-list li:last-child {
            border-bottom: none;
        }
.value-list li i {
            color: var(--primary);
            font-size: 1rem;
            margin-top: 4px;
            flex-shrink: 0;
        }
.stat-box {
            text-align: center;
            padding: 25px 15px;
            background: #fff;
            border: 1px solid rgba(100,116,139,0.2);
            border-radius: 12px;
        }
.stat-box .number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
.stat-box .label {
            font-size: 0.9rem;
            color: #64748b;
            margin-top: 8px;
        }
.about-section {
                padding: 50px 0;
            }
.about-card {
                padding: 20px;
            }
.timeline-item {
                padding-left: 25px;
            }

/* --- 子页面追加 --- */
/* 本页专属补充样式 */
        .guide-hero { padding: 80px 0 40px; background: var(--bg); }
.guide-toc { background: #fff; border-radius: 12px; padding: 24px; margin-bottom: 40px; border: 1px solid rgba(100,116,139,.15); }
.guide-toc h3 { font-size: 1.2rem; margin-bottom: 16px; color: var(--primary); }
.guide-toc ul { list-style: none; padding: 0; margin: 0; }
.guide-toc li { padding: 6px 0; border-bottom: 1px dashed rgba(100,116,139,.15); }
.guide-toc li:last-child { border-bottom: none; }
.guide-toc a { color: var(--text); text-decoration: none; transition: color .3s; }
.guide-toc a:hover { color: var(--primary); }
.guide-section { background: #fff; border-radius: 12px; padding: 32px; margin-bottom: 24px; border: 1px solid rgba(100,116,139,.12); }
.guide-section h2 { font-size: 1.6rem; color: var(--primary); margin-bottom: 20px; font-weight: 700; }
.guide-section h3 { font-size: 1.15rem; color: var(--text); margin: 20px 0 12px; font-weight: 600; }
.guide-section p { line-height: 1.8; color: var(--text); margin-bottom: 12px; }
.guide-section ul, .guide-section ol { padding-left: 20px; margin-bottom: 16px; }
.guide-section li { margin-bottom: 8px; line-height: 1.7; }
.guide-step { display: flex; gap: 16px; margin-bottom: 16px; align-items: flex-start; }
.guide-step-num { width: 32px; height: 32px; min-width: 32px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: .9rem; }
.guide-step-content { flex: 1; }
.guide-step-content p { margin-bottom: 4px; }
.tip-box { background: rgba(100,116,139,.08); border-left: 4px solid var(--primary); padding: 16px 20px; border-radius: 0 8px 8px 0; margin: 20px 0; }
.tip-box p { margin-bottom: 0; }
.device-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; margin: 20px 0; }
.device-item { background: var(--bg); border-radius: 8px; padding: 16px; text-align: center; border: 1px solid rgba(100,116,139,.1); }
.device-item i { font-size: 2rem; color: var(--primary); margin-bottom: 8px; }
.device-item span { display: block; font-size: .9rem; color: var(--text); }
.guide-section { padding: 24px 20px; }
.guide-hero { padding: 60px 0 30px; }

/* --- 子页面追加 --- */
.privacy-section { padding: 60px 0; }
.privacy-card { background: #ffffff; border-radius: 16px; padding: 32px; margin-bottom: 24px; box-shadow: 0 2px 12px rgba(0,0,0,0.06); }
.privacy-card h2 { color: var(--primary); font-size: 1.5rem; font-weight: 700; margin-bottom: 16px; display: flex; align-items: center; gap: 12px; }
.privacy-card h2 i { color: var(--accent); font-size: 1.3rem; }
.privacy-card p, .privacy-card li { color: var(--text); line-height: 1.8; font-size: 0.95rem; }
.privacy-card ul { padding-left: 20px; margin-bottom: 16px; }
.privacy-card ul li { margin-bottom: 8px; }
.privacy-card .highlight { background: #f8fafc; border-left: 4px solid var(--primary); padding: 16px 20px; border-radius: 0 8px 8px 0; margin: 16px 0; }
.privacy-card .highlight p { margin-bottom: 0; font-size: 0.9rem; }
.privacy-updated { text-align: center; color: var(--accent); font-size: 0.9rem; margin-bottom: 40px; }
.privacy-hero { background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%); padding: 60px 0 80px; margin-bottom: -40px; }
.privacy-hero h1 { color: #fff; font-size: 2.2rem; font-weight: 800; text-align: center; }
.privacy-hero p { color: rgba(255,255,255,0.9); text-align: center; font-size: 1.1rem; margin-top: 12px; }
.privacy-card { padding: 24px; }
.privacy-hero h1 { font-size: 1.8rem; }

/* --- 子页面追加 --- */
/* 本页专属样式,合并进站点CSS */
        .terms-section {
            background: var(--bg);
            border-radius: 16px;
            padding: 2rem 2.5rem;
            margin-bottom: 2rem;
            border: 1px solid rgba(100, 116, 139, 0.15);
            box-shadow: 0 4px 20px rgba(30, 41, 59, 0.05);
        }
.terms-section h2 {
            color: var(--primary);
            font-weight: 700;
            font-size: 1.6rem;
            margin-bottom: 1.2rem;
            padding-bottom: 0.6rem;
            border-bottom: 2px solid var(--accent);
            display: inline-block;
        }
.terms-section h3 {
            color: var(--text);
            font-weight: 600;
            font-size: 1.2rem;
            margin-top: 1.5rem;
            margin-bottom: 0.8rem;
        }
.terms-section p, .terms-section li {
            color: var(--text);
            line-height: 1.8;
            font-size: 0.95rem;
        }
.terms-section ul, .terms-section ol {
            padding-left: 1.5rem;
            margin-bottom: 1rem;
        }
.terms-section li {
            margin-bottom: 0.4rem;
        }
.terms-section .highlight-box {
            background: rgba(100, 116, 139, 0.08);
            border-left: 4px solid var(--primary);
            padding: 1rem 1.5rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
        }
.terms-section .highlight-box p {
            margin-bottom: 0;
        }
.terms-updated {
            color: var(--accent);
            font-size: 0.9rem;
            font-style: italic;
            margin-bottom: 2rem;
        }
.terms-nav {
            background: rgba(100, 116, 139, 0.06);
            border-radius: 12px;
            padding: 1.2rem 1.5rem;
            margin-bottom: 2rem;
        }
.terms-nav a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 500;
            margin-right: 1.2rem;
            font-size: 0.9rem;
            transition: color 0.3s;
        }
.terms-nav a:hover {
            color: var(--text);
        }
.terms-section {
                padding: 1.2rem 1.2rem;
            }
.terms-nav a {
                display: inline-block;
                margin-bottom: 0.5rem;
            }