:root {
        --primary: #0891b2;
        --accent: #0ea5e9;
        --bg: #ecfeff;
        --text: #083344;
        --border-color: rgba(8, 145, 178, 0.2);
        --card-bg: #ffffff;
        --muted: #5c7c8a;
    }

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

    body {
        background-color: var(--bg);
        color: var(--text);
        font-family: 'Inter', system-ui, -apple-system, sans-serif;
        line-height: 1.7;
        background-image: radial-gradient(circle, rgba(8, 145, 178, 0.06) 1px, transparent 1px);
        background-size: 24px 24px;
        overflow-x: hidden;
    }

    /* 滚动进度条 */
    #scroll-progress {
        position: fixed;
        top: 0;
        left: 0;
        height: 3px;
        width: 0%;
        background: linear-gradient(90deg, var(--primary), var(--accent));
        z-index: 2000;
        transition: width 0.1s linear;
    }

    /* 导航吸顶 */
    .navbar-custom {
        background: rgba(236, 254, 255, 0.85);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        border-bottom: 1px solid var(--border-color);
        transition: background 0.3s ease, box-shadow 0.3s ease;
        padding-top: 12px;
        padding-bottom: 12px;
    }

    .navbar-custom.scrolled {
        background: rgba(236, 254, 255, 0.97);
        box-shadow: 0 2px 20px rgba(8, 145, 178, 0.08);
    }

    .navbar-brand {
        font-weight: 800;
        font-size: 1.8rem;
        letter-spacing: 1px;
        color: var(--text);
        display: flex;
        align-items: center;
        gap: 6px;
    }

    .navbar-brand i {
        color: var(--primary);
        font-size: 2rem;
    }

    .nav-link-custom {
        font-weight: 600;
        color: var(--text) !important;
        margin: 0 12px;
        position: relative;
        opacity: 0.85;
        transition: opacity 0.2s;
    }

    .nav-link-custom:hover {
        opacity: 1;
    }

    /* 通用容器 */
    .main-container {
        max-width: 780px;
        margin: 0 auto;
        padding-left: 24px;
        padding-right: 24px;
    }

    /* HERO 区 */
    .hero-section {
        padding: 140px 0 80px;
        text-align: center;
        border-bottom: 2px solid var(--border-color);
        margin-bottom: 30px;
    }

    .hero-badge {
        display: inline-block;
        background: rgba(14, 165, 233, 0.1);
        color: var(--primary);
        font-weight: 600;
        font-size: 0.8rem;
        letter-spacing: 1px;
        padding: 6px 16px;
        border-radius: 30px;
        border: 1px solid var(--border-color);
        margin-bottom: 24px;
    }

    .hero-title {
        font-size: clamp(2.8rem, 8vw, 4.8rem);
        font-weight: 900;
        line-height: 1.1;
        color: var(--text);
        letter-spacing: -1px;
        margin-bottom: 16px;
        font-family: 'Inter', sans-serif;
    }

    .hero-sub {
        font-size: 1.3rem;
        color: var(--muted);
        max-width: 560px;
        margin: 0 auto 32px;
        font-weight: 400;
    }

    .btn-hero {
        background: var(--primary);
        color: white;
        padding: 12px 36px;
        border-radius: 40px;
        font-weight: 700;
        border: none;
        transition: all 0.2s;
        margin: 8px;
        box-shadow: none;
        font-size: 1rem;
    }

    .btn-outline-hero {
        background: transparent;
        color: var(--text);
        border: 2px solid var(--primary);
        padding: 12px 32px;
        border-radius: 40px;
        font-weight: 600;
        transition: all 0.2s;
        margin: 8px;
    }

    .btn-hero:hover {
        background: var(--accent);
        transform: translateY(-2px);
    }

    .btn-outline-hero:hover {
        background: rgba(8, 145, 178, 0.05);
        border-color: var(--accent);
    }

    /* 区块标题 */
    .section-title {
        font-size: 2.2rem;
        font-weight: 800;
        margin-bottom: 16px;
        letter-spacing: -0.5px;
        border-left: 6px solid var(--primary);
        padding-left: 16px;
    }

    .section-sub {
        color: var(--muted);
        margin-bottom: 48px;
        font-weight: 400;
    }

    /* 特色卡片区 */
    .feature-card {
        background: var(--card-bg);
        border: 1px solid var(--border-color);
        border-radius: 20px;
        padding: 28px 24px;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        height: 100%;
        box-shadow: none;
    }

    .feature-card:hover {
        transform: translateY(-6px);
        box-shadow: 0 18px 40px rgba(8, 145, 178, 0.1);
        border-color: var(--accent);
    }

    .feature-icon {
        font-size: 2.2rem;
        color: var(--primary);
        margin-bottom: 16px;
    }

    .feature-card h5 {
        font-weight: 700;
        margin-bottom: 8px;
    }

    .feature-card p {
        color: var(--muted);
        font-size: 0.95rem;
    }

    /* 对比表格 */
    .compare-table {
        width: 100%;
        border-collapse: collapse;
        background: white;
        border-radius: 16px;
        overflow: hidden;
        border: 1px solid var(--border-color);
    }

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

    .compare-table th {
        background: rgba(8, 145, 178, 0.08);
        font-weight: 700;
        color: var(--text);
    }

    .compare-table tr:last-child td {
        border-bottom: none;
    }

    .compare-check {
        color: var(--primary);
        font-weight: 800;
    }

    .compare-cross {
        color: #94a3b8;
    }

    /* 编号清单 */
    .numbered-list {
        list-style: none;
        counter-reset: step-counter;
        margin: 0;
        padding: 0;
    }

    .numbered-list li {
        counter-increment: step-counter;
        margin-bottom: 24px;
        padding-left: 52px;
        position: relative;
        font-size: 1.05rem;
    }

    .numbered-list li::before {
        content: counter(step-counter);
        position: absolute;
        left: 0;
        top: 0;
        width: 36px;
        height: 36px;
        background: var(--primary);
        color: white;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 700;
        font-size: 1rem;
    }

    /* FAQ */
    .faq-item {
        background: white;
        border: 1px solid var(--border-color);
        border-radius: 16px;
        padding: 24px;
        margin-bottom: 16px;
        transition: border 0.2s;
    }

    .faq-item summary {
        font-weight: 700;
        font-size: 1.1rem;
        cursor: pointer;
        list-style: none;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .faq-item summary::-webkit-details-marker {
        display: none;
    }

    .faq-item p {
        margin-top: 16px;
        color: var(--muted);
    }

    /* CTA */
    .cta-section {
        background: linear-gradient(135deg, #f0faff, #ffffff);
        border: 2px solid var(--border-color);
        border-radius: 32px;
        padding: 60px 24px;
        text-align: center;
        margin: 60px 0;
    }

    .cta-title {
        font-size: 2.5rem;
        font-weight: 900;
        color: var(--text);
        margin-bottom: 12px;
    }

    .cta-sub {
        color: var(--muted);
        margin-bottom: 32px;
        font-size: 1.2rem;
    }

    /* 友情链接 */
    .friend-links {
        border-top: 1px solid var(--border-color);
        padding: 32px 0;
        margin-top: 40px;
        font-size: 0.9rem;
    }

    .friend-links a {
        color: var(--muted);
        text-decoration: none;
        margin: 0 12px;
    }

    .friend-links a:hover {
        color: var(--primary);
    }

    footer {
        text-align: center;
        padding: 32px 0 48px;
        color: var(--muted);
        border-top: 1px solid var(--border-color);
        font-size: 0.9rem;
    }

    footer .brand-footer {
        color: var(--text);
        font-weight: 700;
    }

    /* 移动端调整 */
    @media (max-width: 576px) {
        .hero-section {
            padding: 100px 0 60px;
        }
        .section-title {
            font-size: 1.8rem;
        }
        .navbar-brand {
            font-size: 1.4rem;
        }
    }

    /* 点阵背景增强 */
    .navbar-collapse {
        background: transparent;
    }
    .navbar-toggler {
        border: 1px solid var(--border-color);
    }

/* --- 子页面追加 --- */
/* 针对关于页的小调整 */
        .about-hero {
            background: linear-gradient(145deg, var(--bg) 0%, rgba(14,165,233,0.08) 100%);
            border-bottom: 1px solid var(--border-color);
        }
.about-section {
            background-color: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 1.5rem;
            padding: 2rem 1.8rem;
            margin-bottom: 2.5rem;
            box-shadow: 0 8px 24px rgba(8, 145, 178, 0.04);
        }
.about-section h2 {
            color: var(--primary);
            font-weight: 700;
            font-size: 1.65rem;
            border-left: 5px solid var(--accent);
            padding-left: 1rem;
            margin-bottom: 1.2rem;
            letter-spacing: -0.02em;
        }
.about-section h3 {
            color: var(--text);
            font-weight: 600;
            font-size: 1.2rem;
            margin-top: 1.5rem;
            margin-bottom: 0.75rem;
        }
.about-section p {
            color: var(--text);
            opacity: 0.88;
            line-height: 1.75;
        }
.about-section .lead {
            font-size: 1.08rem;
            font-weight: 400;
            color: var(--text);
            opacity: 0.95;
        }
.brand-rule {
            background: var(--primary);
            width: 70px;
            height: 4px;
            border-radius: 4px;
            margin: 0.5rem 0 1.5rem 0;
        }
.feature-badge-mini {
            background: rgba(8, 145, 178, 0.08);
            color: var(--primary);
            border-radius: 50px;
            padding: 0.2rem 0.9rem;
            font-weight: 500;
            font-size: 0.85rem;
            border: 1px solid var(--border-color);
        }
.about-quote {
            background: var(--bg);
            border-left: 4px solid var(--accent);
            padding: 1rem 1.5rem;
            border-radius: 0.75rem;
            font-style: italic;
            color: var(--text);
            margin: 1.8rem 0;
        }
/* bootstrap组件覆盖 (极少用) */
        .about-section .list-unstyled li {
            color: var(--text);
            padding: 0.3rem 0;
        }
.about-section .list-unstyled i {
            color: var(--accent);
            margin-right: 0.5rem;
        }
/* 导航高亮当前页 */
        .nav-link-custom.active-page {
            color: var(--primary) !important;
            font-weight: 600;
            border-bottom: 2px solid var(--accent);
        }

/* --- 子页面追加 --- */
/* 保证任何 bootstrap 卡片等组件与本深色/浅色主题一致 */
        .card, .card-body, .card-title, .card-text, .card-header, .card-footer,
        .form-control, .form-select, .form-label, .input-group-text,
        .table, .list-group-item, .accordion-item, .accordion-button, .accordion-body,
        .modal-content, .modal-header, .modal-body, .dropdown-menu, .dropdown-item,
        .nav-link, .navbar, .navbar-brand, .btn-light, .btn-outline-* {
            background: var(--card-bg, #ffffff);
            color: var(--text, #083344);
            border-color: var(--border-color, rgba(8, 145, 178, 0.2));
        }
/* 进一步统一背景、链接 */
        body {
            background-color: var(--bg, #ecfeff);
            color: var(--text, #083344);
        }
.section-title, .section-sub, .cta-title, .cta-sub {
            color: var(--text, #083344);
        }
/* 覆盖可能出现的 bootstrap 表格等 */
        .table {
            background: var(--card-bg, #ffffff);
            color: var(--text, #083344);
        }
.list-group-item {
            background: var(--card-bg, #ffffff);
            color: var(--text, #083344);
            border-color: var(--border-color, rgba(8, 145, 178, 0.2));
        }
/* 强制所有区块背景跟随变量 */
        .main-container, .hero-section, .cta-section {
            background: transparent;
        }

/* --- 子页面追加 --- */
/* 隐私政策页面专属样式 */
        .privacy-hero {
            padding: 60px 0 40px;
            background: linear-gradient(135deg, rgba(8,145,178,0.08) 0%, rgba(14,165,233,0.05) 100%);
            border-bottom: 1px solid var(--border-color);
        }
.privacy-hero .hero-badge {
            display: inline-block;
            background: rgba(8,145,178,0.1);
            color: var(--primary);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 20px;
        }
.privacy-hero h1 {
            color: var(--text);
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 16px;
        }
.privacy-hero p {
            color: var(--muted);
            font-size: 1.05rem;
            max-width: 720px;
            margin: 0 auto;
            line-height: 1.7;
        }
.privacy-content {
            padding: 50px 0 60px;
        }
.privacy-section {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 32px;
            margin-bottom: 28px;
            transition: box-shadow 0.3s ease;
        }
.privacy-section:hover {
            box-shadow: 0 8px 30px rgba(8,145,178,0.08);
        }
.privacy-section h2 {
            color: var(--text);
            font-size: 1.35rem;
            font-weight: 700;
            margin-bottom: 18px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
.privacy-section h2 i {
            color: var(--primary);
            font-size: 1.1rem;
        }
.privacy-section p {
            color: var(--muted);
            line-height: 1.8;
            font-size: 0.95rem;
            margin-bottom: 14px;
        }
.privacy-section ul {
            padding-left: 20px;
            margin-bottom: 14px;
        }
.privacy-section ul li {
            color: var(--muted);
            line-height: 1.8;
            font-size: 0.95rem;
            margin-bottom: 8px;
            position: relative;
        }
.privacy-section ul li::before {
            content: "";
            position: absolute;
            left: -14px;
            top: 10px;
            width: 6px;
            height: 6px;
            background: var(--primary);
            border-radius: 50%;
            opacity: 0.6;
        }
.privacy-section .highlight-box {
            background: rgba(8,145,178,0.06);
            border-left: 3px solid var(--primary);
            padding: 14px 18px;
            border-radius: 0 8px 8px 0;
            margin: 16px 0;
            font-size: 0.9rem;
            color: var(--text);
        }
.privacy-section .highlight-box i {
            color: var(--primary);
            margin-right: 8px;
        }
.privacy-updated {
            text-align: center;
            color: var(--muted);
            font-size: 0.9rem;
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
        }
.privacy-updated i {
            color: var(--primary);
            margin-right: 6px;
        }
.privacy-hero {
                padding: 40px 0 30px;
            }
.privacy-hero h1 {
                font-size: 1.7rem;
            }
.privacy-section {
                padding: 24px 20px;
            }