:root {
    --main-color: #22d3ee;
    --accent-color: #fb923c;
    --bg-color: #0f172a;
    --text-color: #e2e8f0;
    --border-color: #334155;
    --card-bg: #1e293b;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.8;
    font-weight: 400;
    letter-spacing: 0.02em;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Inter', 'ZCOOL KuaiLe', 'YouYuan', '圆体', sans-serif;
    font-weight: 800;
    letter-spacing: 0.01em;
    line-height: 1.4;
}

p {
    line-height: 1.9;
    color: #cbd5e1;
}

/* 滚动进度条 */
.progress-bar-top {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--main-color), var(--accent-color));
    z-index: 9999;
    transition: width 0.1s ease;
}

/* 导航栏 */
.navbar {
    background-color: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
    z-index: 1000;
}

.navbar-brand {
    font-size: 1.6rem;
    font-weight: 900;
    color: var(--main-color) !important;
    letter-spacing: 0.02em;
}

.navbar-brand i {
    color: var(--accent-color);
    margin-right: 6px;
}

.nav-link {
    color: var(--text-color) !important;
    font-weight: 500;
    margin: 0 12px;
    padding: 6px 0 !important;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.nav-link:hover {
    color: var(--main-color) !important;
    border-bottom-color: var(--main-color);
}

.navbar-toggler {
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(226, 232, 240, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Hero区域 */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 20px 80px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--main-color);
    margin-bottom: 20px;
    letter-spacing: 0.03em;
    line-height: 1.3;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--text-color);
    max-width: 700px;
    margin: 0 auto 40px;
    font-weight: 400;
    line-height: 1.8;
}

.btn-hero-primary {
    background-color: var(--main-color);
    color: #0f172a;
    font-weight: 700;
    border: 2px solid var(--main-color);
    padding: 14px 36px;
    font-size: 1rem;
    border-radius: 6px;
    transition: all 0.3s ease;
    margin: 0 10px;
    display: inline-block;
    text-decoration: none;
}

.btn-hero-primary:hover {
    background-color: transparent;
    color: var(--main-color);
    border-color: var(--main-color);
}

.btn-hero-secondary {
    background-color: transparent;
    color: var(--accent-color);
    font-weight: 700;
    border: 2px solid var(--accent-color);
    padding: 14px 36px;
    font-size: 1rem;
    border-radius: 6px;
    transition: all 0.3s ease;
    margin: 0 10px;
    display: inline-block;
    text-decoration: none;
}

.btn-hero-secondary:hover {
    background-color: var(--accent-color);
    color: #0f172a;
    border-color: var(--accent-color);
}

/* 区块通用 */
.section-padding {
    padding: 100px 0;
    border-bottom: 1px solid var(--border-color);
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-color);
    margin-bottom: 20px;
    position: relative;
    display: inline-block;
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--accent-color);
}

/* 数据统计 */
.stats-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 30px;
    text-align: center;
}

.stat-item {
    padding: 30px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: transform 0.3s ease, border-color 0.3s ease;
    background-color: transparent;
}

.stat-item:hover {
    transform: scale(1.02);
    border-color: var(--main-color);
}

.stat-number {
    font-size: 2.8rem;
    font-weight: 900;
    color: var(--main-color);
    display: block;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-color);
    letter-spacing: 0.05em;
}

/* 使用说明-时间线 */
.timeline {
    position: relative;
    padding: 20px 0;
}

.timeline:before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 28px;
    width: 2px;
    background: linear-gradient(to bottom, var(--main-color), var(--accent-color));
}

.timeline-item {
    position: relative;
    padding-left: 80px;
    margin-bottom: 40px;
}

.timeline-marker {
    position: absolute;
    left: 16px;
    top: 5px;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background-color: var(--bg-color);
    border: 2px solid var(--accent-color);
    z-index: 1;
}

.timeline-marker:after {
    content: '';
    position: absolute;
    top: 5px;
    left: 5px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--accent-color);
}

.timeline-step {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--main-color);
    letter-spacing: 0.08em;
    margin-bottom: 5px;
    text-transform: uppercase;
}

.timeline-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 8px;
}

.timeline-text {
    color: #94a3b8;
    line-height: 1.8;
}

/* 特色对比表格 */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
}

.comparison-table th,
.comparison-table td {
    padding: 16px 20px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.comparison-table th {
    background-color: rgba(34, 211, 238, 0.05);
    font-weight: 700;
    color: var(--main-color);
    font-size: 1.05rem;
}

.comparison-table td {
    color: var(--text-color);
}

.comparison-table .table-header-main {
    background-color: rgba(34, 211, 238, 0.15);
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--main-color);
}

.comparison-table .fa-check {
    color: var(--main-color);
}

.comparison-table .fa-xmark {
    color: var(--accent-color);
}

.comparison-table .fa-minus {
    color: var(--border-color);
}

/* FAQ */
.faq-item {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 20px;
    padding: 24px 30px;
    background-color: transparent;
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: var(--main-color);
}

.faq-question {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question i {
    color: var(--accent-color);
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question i {
    transform: rotate(45deg);
}

.faq-answer {
    margin-top: 15px;
    color: #94a3b8;
    line-height: 1.9;
    display: none;
    border-top: 1px dashed var(--border-color);
    padding-top: 15px;
}

.faq-item.active .faq-answer {
    display: block;
}

/* CTA */
.cta-section {
    text-align: center;
    padding: 100px 0;
    border-bottom: 1px solid var(--border-color);
}

.cta-title {
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--text-color);
    margin-bottom: 20px;
}

.cta-subtitle {
    font-size: 1.2rem;
    color: #94a3b8;
    max-width: 600px;
    margin: 0 auto 40px;
}

.cta-btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: #0f172a;
    font-weight: 800;
    padding: 16px 48px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 1.1rem;
    border: 2px solid var(--accent-color);
    transition: all 0.3s ease;
}

.cta-btn:hover {
    background-color: transparent;
    color: var(--accent-color);
    border-color: var(--accent-color);
}

/* 友情链接 */
.friend-links {
    padding: 60px 0;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(30, 41, 59, 0.3);
}

.friend-links-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 20px;
    letter-spacing: 0.05em;
}

.friend-links-content {
    color: #94a3b8;
    font-size: 0.95rem;
    line-height: 2.2;
}

/* 页脚 */
.footer {
    padding: 40px 0;
    background-color: rgba(15, 23, 42, 1);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.footer-brand {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--main-color);
}

.footer-copyright {
    color: #64748b;
    font-size: 0.9rem;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    margin-left: 20px;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--main-color);
}

/* 滚动淡入动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .btn-hero-primary,
    .btn-hero-secondary {
        padding: 12px 28px;
        margin: 8px 5px;
        font-size: 0.95rem;
    }
    
    .section-padding {
        padding: 70px 0;
    }
    
    .section-title {
        font-size: 1.6rem;
    }
    
    .timeline:before {
        left: 20px;
    }
    
    .timeline-item {
        padding-left: 60px;
    }
    
    .timeline-marker {
        left: 8px;
        width: 24px;
        height: 24px;
    }
    
    .timeline-marker:after {
        top: 4px;
        left: 4px;
        width: 12px;
        height: 12px;
    }
    
    .stats-wrapper {
        gap: 15px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .comparison-table {
        font-size: 0.9rem;
    }
    
    .comparison-table th,
    .comparison-table td {
        padding: 12px 8px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .footer-links a {
        margin: 0 10px;
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .btn-hero-primary,
    .btn-hero-secondary {
        display: block;
        width: 100%;
        max-width: 280px;
        margin: 10px auto;
    }
    
    .comparison-table th,
    .comparison-table td {
        padding: 8px 5px;
        font-size: 0.8rem;
    }
}

/* --- 子页面追加 --- */
background: linear-gradient(135deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.7)), url(' {随机图片}
.about-hero h1 {
            color: var(--main-color);
            font-weight: 800;
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }
.about-hero p {
            color: var(--text-color);
            max-width: 700px;
            margin: 0 auto;
            font-size: 1.1rem;
            line-height: 1.8;
        }
.about-section {
            padding: 60px 0;
            border-bottom: 1px solid var(--border-color);
        }
.about-section:last-child {
            border-bottom: none;
        }
.about-section h2 {
            color: var(--main-color);
            font-weight: 700;
            margin-bottom: 30px;
            font-size: 1.8rem;
            position: relative;
            padding-bottom: 12px;
        }
.about-section h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 3px;
            background: var(--accent-color);
            border-radius: 2px;
        }
.about-section p {
            color: var(--text-color);
            line-height: 1.9;
            font-size: 1rem;
            margin-bottom: 1.2rem;
        }
.about-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 25px;
            height: 100%;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
.about-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(34, 211, 238, 0.1);
        }
.about-card i {
            color: var(--accent-color);
            font-size: 2rem;
            margin-bottom: 15px;
        }
.about-card h3 {
            color: var(--text-color);
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 12px;
        }
.about-card p {
            color: var(--text-color);
            font-size: 0.95rem;
            line-height: 1.7;
            margin-bottom: 0;
        }
.mission-box {
            background: var(--card-bg);
            border-left: 4px solid var(--main-color);
            padding: 20px 25px;
            border-radius: 0 10px 10px 0;
            margin: 20px 0;
        }
.mission-box p {
            font-size: 1.05rem;
            font-style: italic;
            color: var(--text-color);
            margin: 0;
        }

/* --- 子页面追加 --- */
/* 强制覆盖bootstrap组件为本站暗色风格 */
        .card, .card-body, .card-title, .card-text, .card-header, .card-footer,
        .list-group-item, .accordion-item, .accordion-button, .accordion-body {
            background: var(--card-bg) !important;
            color: var(--text-color) !important;
            border-color: var(--border-color) !important;
        }
.accordion-button:not(.collapsed) {
            background: rgba(34, 211, 238, 0.08) !important;
            color: var(--main-color) !important;
            box-shadow: none;
        }
.accordion-button:focus {
            box-shadow: 0 0 0 0.2rem rgba(34, 211, 238, 0.15);
        }
.form-control, .form-select {
            background: rgba(0,0,0,0.35) !important;
            border: 1px solid var(--border-color) !important;
            color: var(--text-color) !important;
        }
.form-control::placeholder {
            color: rgba(255,255,255,0.45);
        }
.nav-link, .navbar-brand {
            color: var(--text-color) !important;
        }
.nav-link:hover, .navbar-brand:hover {
            color: var(--main-color) !important;
        }
/* 确保卡片内链接可见 */
        .card a {
            color: var(--main-color);
        }
.card a:hover {
            color: var(--accent-color);
        }
/* 页脚链接 */
        .footer-links a {
            color: var(--text-color);
            margin-right: 1.5rem;
            text-decoration: none;
        }
/* 自定义分隔线 */
        .disclaimer-divider {
            border-top: 1px solid var(--border-color);
            opacity: 0.6;
        }
/* 小标题带品牌色点缀 */
        .section-title i {
            color: var(--accent-color);
        }

/* --- 子页面追加 --- */
/* 页面专属样式 */
        .privacy-hero {
            padding: 80px 0 40px;
            background: linear-gradient(135deg, rgba(34, 211, 238, 0.05) 0%, rgba(251, 146, 60, 0.05) 100%);
            border-bottom: 1px solid var(--border-color);
        }
.privacy-content {
            max-width: 900px;
            margin: 0 auto;
            padding: 40px 0 60px;
        }
.privacy-section {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            margin-bottom: 30px;
        }
.privacy-section h2 {
            color: var(--main-color);
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
.privacy-section h2 i {
            color: var(--accent-color);
            font-size: 1.3rem;
        }
.privacy-section h3 {
            color: var(--text-color);
            font-size: 1.1rem;
            font-weight: 600;
            margin: 20px 0 10px;
        }
.privacy-section p {
            color: rgba(226, 232, 240, 0.85);
            line-height: 1.8;
            margin-bottom: 15px;
        }
.privacy-section ul {
            color: rgba(226, 232, 240, 0.85);
            padding-left: 20px;
            margin-bottom: 15px;
        }
.privacy-section li {
            margin-bottom: 8px;
            line-height: 1.7;
        }
.privacy-highlight {
            background: rgba(34, 211, 238, 0.08);
            border-left: 3px solid var(--main-color);
            padding: 15px 20px;
            border-radius: 0 8px 8px 0;
            margin: 20px 0;
        }
.privacy-highlight p {
            margin-bottom: 0;
            color: var(--text-color);
        }
.privacy-contact {
            background: linear-gradient(135deg, rgba(34, 211, 238, 0.1), rgba(251, 146, 60, 0.1));
            border: 1px solid var(--main-color);
        }
.last-updated {
            color: rgba(226, 232, 240, 0.6);
            font-size: 0.9rem;
            text-align: right;
            margin-top: 30px;
        }
.privacy-hero {
                padding: 60px 0 30px;
            }
.privacy-section {
                padding: 20px;
            }

/* --- 子页面追加 --- */
.guide-hero { padding: 80px 0 40px; }
.guide-card { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 12px; padding: 24px; height: 100%; transition: transform .2s, border-color .2s; }
.guide-card:hover { transform: translateY(-4px); border-color: var(--main-color); }
.guide-card i { color: var(--main-color); margin-bottom: 16px; }
.step-wrapper { position: relative; padding-left: 24px; margin-bottom: 32px; }
.step-wrapper::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 2px; background: linear-gradient(to bottom, var(--main-color), var(--accent-color)); }
.step-item { position: relative; margin-bottom: 24px; }
.step-item::before { content: attr(data-step); position: absolute; left: -34px; top: 0; width: 24px; height: 24px; background: var(--main-color); color: #fff; border-radius: 50%; font-size: 12px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.step-title { font-size: 18px; font-weight: 600; color: var(--text-color); margin-bottom: 8px; }
.step-desc { color: var(--text-color); opacity: .8; font-size: 14px; line-height: 1.8; }
.tip-box { background: rgba(34, 211, 238, 0.08); border-left: 3px solid var(--main-color); padding: 16px 20px; border-radius: 0 8px 8px 0; margin: 24px 0; }
.tip-box i { color: var(--main-color); margin-right: 8px; }
.shortcut-table { width: 100%; border-collapse: collapse; }
.shortcut-table td { padding: 12px 16px; border-bottom: 1px solid var(--border-color); color: var(--text-color); font-size: 14px; }
.shortcut-table tr:last-child td { border-bottom: none; }
.shortcut-table td:first-child { font-weight: 600; color: var(--main-color); white-space: nowrap; }
.mode-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 24px 0; }
.mode-compare { grid-template-columns: 1fr; }
.guide-hero { padding: 40px 0 24px; }
.mode-card { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 12px; padding: 20px; }
.mode-card h4 { color: var(--main-color); font-size: 16px; margin-bottom: 12px; }
.mode-card p { color: var(--text-color); font-size: 14px; opacity: .85; line-height: 1.7; }
.key-icon { color: var(--accent-color); }
.section-title::after { content: ''; position: absolute; bottom: 0; left: 0; width: 48px; height: 3px; background: linear-gradient(90deg, var(--main-color), var(--accent-color)); border-radius: 2px; }
.section-subtitle { color: var(--text-color); opacity: .7; font-size: 15px; margin-bottom: 40px; }

/* --- Bootstrap 组件配色适配(程序自动补,避免白底黑字) --- */
.accordion-header { background:transparent !important; }