:root {
            --main: #38bdf8;
            --accent: #a78bfa;
            --bg: #0f172a;
            --text: #e2e8f0;
            --card-bg: #1e293b;
            --border-light: #334155;
            --radius: 8px;
            --shadow: 0 8px 20px rgba(0,0,0,0.25);
        }
        * { margin:0; padding:0; box-sizing: border-box; }
        body {
            background-color: var(--bg);
            color: var(--text);
            font-family: 'Inter', sans-serif;
            line-height: 1.65;
            overflow-x: hidden;
        }
        /* 阅读进度条 */
        #progressBar {
            position: fixed;
            top: 0; left: 0;
            width: 0%;
            height: 4px;
            background: linear-gradient(90deg, var(--main), var(--accent));
            z-index: 9999;
            border-radius: 2px;
            transition: width 0.1s ease-out;
        }
        /* 导航 */
        .navbar-custom {
            background-color: rgba(15, 23, 42, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-light);
            padding: 0.8rem 1.5rem;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.7rem;
            letter-spacing: -0.02em;
            color: var(--main) !important;
            display: flex;
            align-items: center;
        }
        .navbar-brand i {
            margin-right: 8px;
            color: var(--accent);
        }
        .navbar-nav .nav-link {
            color: var(--text) !important;
            font-weight: 500;
            margin: 0 0.7rem;
            transition: color 0.2s;
        }
        .navbar-nav .nav-link:hover {
            color: var(--main) !important;
        }
        /* hero 波浪分割 */
        .hero-section {
            padding: 6rem 0 8rem;
            background: radial-gradient(circle at 10% 20%, #1e293b, #0f172a);
            position: relative;
            text-align: center;
        }
        .hero-badge {
            font-size: 1rem;
            background: rgba(167, 139, 250, 0.15);
            border: 1px solid rgba(167,139,250,0.3);
            padding: 0.3rem 1.2rem;
            border-radius: 30px;
            letter-spacing: 1px;
        }
        .big-number {
            font-family: 'Courier New', monospace;
            font-size: 5.5rem;
            font-weight: 800;
            color: var(--main);
            line-height: 1.1;
            margin: 1rem 0;
        }
        .big-number span { color: var(--accent); }
        .hero-sub {
            font-size: 1.5rem;
            font-weight: 300;
            max-width: 700px;
            margin: 0 auto 2rem;
            color: #cbd5e1;
        }
        .wave-divider {
            position: relative;
            background: var(--bg);
        }
        .wave-divider::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: 0;
            width: 100%;
            height: 80px;
            background: var(--bg);
            clip-path: polygon(0 40%, 100% 0%, 100% 100%, 0% 100%);
            z-index: 2;
        }
        /* 长文区块 */
        .long-intro {
            padding: 5rem 0;
            background-color: var(--bg);
        }
        .intro-title {
            font-weight: 800;
            font-size: 2.5rem;
            letter-spacing: -0.02em;
        }
        .step-list {
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            margin-top: 2.5rem;
        }
        .step-item {
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 1.8rem;
            flex: 1 1 200px;
            box-shadow: var(--shadow);
            transition: transform 0.2s, opacity 0.4s;
            opacity: 0;
            transform: translateY(30px);
        }
        .step-item.visible {
            opacity: 1;
            transform: translateY(0);
        }
        .step-item i {
            font-size: 2rem;
            color: var(--accent);
            margin-bottom: 1rem;
        }
        /* 对比表格 */
        .compare-section {
            padding: 5rem 0;
            background: var(--bg);
        }
        .table-custom {
            background: var(--card-bg);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .table-custom th {
            background: #1a2637;
            color: var(--main);
            font-weight: 700;
            border-bottom: 2px solid var(--accent);
            padding: 1.2rem;
        }
        .table-custom td {
            padding: 1.2rem;
            border-bottom: 1px solid var(--border-light);
            background: var(--card-bg);
            vertical-align: middle;
        }
        .table-custom .highlight-cell {
            background: rgba(56, 189, 248, 0.08);
            color: var(--main);
            font-weight: 600;
        }
        /* FAQ手风琴 */
        .faq-section {
            padding: 5rem 0;
            background: var(--bg);
            border-top: 1px solid var(--border-light);
        }
        .accordion-item {
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius) !important;
            margin-bottom: 1.2rem;
            overflow: hidden;
        }
        .accordion-button {
            background: var(--card-bg);
            color: var(--text);
            font-weight: 600;
            padding: 1.2rem;
            box-shadow: none;
        }
        .accordion-button:not(.collapsed) {
            background: #1a2637;
            color: var(--main);
        }
        .accordion-body {
            background: var(--card-bg);
            color: #cbd5e1;
            padding: 1rem 1.5rem;
        }
        /* 特色卡片 */
        .feature-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            padding: 2rem 1.5rem;
            text-align: center;
            transition: transform 0.3s, box-shadow 0.3s;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            height: 100%;
            opacity: 0;
            transform: translateY(20px);
        }
        .feature-card.visible {
            opacity: 1;
            transform: translateY(0);
        }
        .feature-card i {
            font-size: 2.8rem;
            background: linear-gradient(145deg, var(--main), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 1rem;
        }
        /* CTA */
        .cta-section {
            padding: 4rem 0;
            background: linear-gradient(120deg, #0b1122, #1a2637);
            border-top: 1px solid var(--border-light);
            text-align: center;
        }
        .cta-btn {
            background: linear-gradient(90deg, var(--main), var(--accent));
            border: none;
            padding: 1rem 3rem;
            font-weight: 700;
            font-size: 1.2rem;
            border-radius: 50px;
            color: #0f172a;
            box-shadow: 0 8px 24px rgba(56,189,248,0.25);
            transition: 0.3s;
        }
        .cta-btn:hover {
            transform: scale(1.02);
            background: linear-gradient(90deg, var(--accent), var(--main));
        }
        /* 友情链接与页脚 */
        .friend-links {
            background: var(--bg);
            border-top: 1px solid var(--border-light);
            padding: 2rem 0;
        }
        footer {
            background: #0a111f;
            padding: 2rem 0;
            border-top: 1px solid var(--border-light);
        }
        /* 动效 */
        .reveal-group {
            transition: all 0.5s;
        }
        @media (max-width: 992px) {
            .big-number { font-size: 3.5rem; }
            .intro-title { font-size: 2rem; }
            .navbar-collapse { background: #0f172a; padding: 1rem; border-radius: 10px; }
        }

/* --- 子页面追加 --- */
/* 本页少量专属样式 —— 仅用于微调间距与特殊元素 */
        .about-hero {
            padding: 3rem 0 2rem;
            border-bottom: 1px solid var(--border-light);
            margin-bottom: 2.5rem;
        }
.about-section {
            margin-bottom: 3rem;
        }
.about-section h2 {
            font-weight: 700;
            font-size: 1.75rem;
            color: var(--main);
            margin-bottom: 1.25rem;
            letter-spacing: -0.01em;
            border-left: 4px solid var(--accent);
            padding-left: 1rem;
        }
.about-section p {
            color: var(--text);
            line-height: 1.75;
            font-size: 1.05rem;
        }
.about-section ul {
            padding-left: 1.5rem;
            color: var(--text);
        }
.about-section li {
            margin-bottom: 0.6rem;
            line-height: 1.7;
        }
.big-para {
            font-size: 1.15rem;
            font-weight: 400;
            color: #cbd5e1;
        }
.insight-card {
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 1.75rem;
            height: 100%;
            transition: transform 0.2s ease, border-color 0.2s ease;
        }
.insight-card:hover {
            border-color: var(--main);
            transform: translateY(-3px);
        }
.insight-card i {
            color: var(--accent);
            font-size: 1.8rem;
            margin-bottom: 1rem;
        }
.insight-card h3 {
            font-size: 1.3rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 0.75rem;
        }
.insight-card p {
            color: #94a3b8;
            font-size: 0.98rem;
            line-height: 1.6;
        }
.stat-badge {
            background: rgba(56, 189, 248, 0.12);
            color: var(--main);
            border-radius: 50px;
            padding: 0.3rem 0.9rem;
            font-size: 0.85rem;
            font-weight: 600;
            display: inline-block;
            margin-bottom: 1rem;
            letter-spacing: 0.3px;
            border: 1px solid rgba(56, 189, 248, 0.25);
        }
.divider-light {
            border-top: 1px solid var(--border-light);
            opacity: 0.6;
            margin: 2rem 0;
        }
.about-hero {
                padding: 2rem 0 1.5rem;
            }
.about-section h2 {
                font-size: 1.5rem;
            }

/* --- 子页面追加 --- */
/* 下载页专属卡片样式，与站点配色一致 */
        .download-card {
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 2rem 1.5rem;
            height: 100%;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }
.download-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 28px rgba(0,0,0,0.4);
        }
.download-icon {
            font-size: 2.8rem;
            color: var(--main);
            margin-bottom: 1rem;
        }
.download-version {
            font-size: 0.85rem;
            color: var(--text);
            opacity: 0.7;
            letter-spacing: 0.3px;
        }
.btn-download {
            background: var(--main);
            color: #0f172a;
            font-weight: 700;
            padding: 0.6rem 1.8rem;
            border-radius: 40px;
            border: none;
            transition: background 0.2s, transform 0.1s;
            display: inline-block;
            text-decoration: none;
            margin-top: 1.2rem;
        }
.btn-download:hover {
            background: #7dd3fc;
            color: #0f172a;
            transform: scale(1.02);
        }
.btn-download i {
            margin-right: 6px;
        }
.os-tag {
            display: inline-block;
            background: rgba(56, 189, 248, 0.15);
            color: var(--main);
            font-size: 0.75rem;
            padding: 0.2rem 0.8rem;
            border-radius: 30px;
            border: 1px solid rgba(56,189,248,0.25);
            margin-bottom: 0.8rem;
        }
.feature-mini-list {
            list-style: none;
            padding: 0;
            margin: 1rem 0 0 0;
        }
.feature-mini-list li {
            padding: 0.3rem 0;
            font-size: 0.9rem;
            color: var(--text);
        }
.feature-mini-list li i {
            color: var(--accent);
            margin-right: 8px;
            width: 18px;
        }
.download-note {
            background: rgba(167, 139, 250, 0.1);
            border-left: 4px solid var(--accent);
            padding: 0.8rem 1.2rem;
            border-radius: 0 8px 8px 0;
            font-size: 0.9rem;
        }
.step-download {
            background: transparent;
        }
.step-download .step-item {
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 1.5rem;
            margin-bottom: 1rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        }
/* 覆盖 Bootstrap 可能出现的白底类 */
        .card, .card-body, .list-group-item, .accordion-item {
            background: transparent !important;
            color: var(--text) !important;
            border-color: var(--border-light) !important;
        }
.navbar-nav .nav-link.active {
            color: var(--main) !important;
            font-weight: 600;
        }

/* --- 子页面追加 --- */
/* 本页专属样式 */
        .disclaimer-hero {
            background: linear-gradient(135deg, rgba(56,189,248,0.1), rgba(167,139,250,0.1));
            padding: 80px 0 60px;
            border-bottom: 1px solid var(--border-light);
        }
.disclaimer-section {
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 30px;
            margin-bottom: 25px;
            box-shadow: var(--shadow);
        }
.disclaimer-section h2 {
            color: var(--main);
            font-weight: 700;
            font-size: 1.5rem;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
.disclaimer-section h2 i {
            font-size: 1.3rem;
            color: var(--accent);
        }
.disclaimer-section p {
            color: var(--text);
            line-height: 1.8;
            margin-bottom: 15px;
        }
.disclaimer-section ul {
            color: var(--text);
            padding-left: 20px;
            margin-bottom: 15px;
        }
.disclaimer-section ul li {
            margin-bottom: 8px;
            line-height: 1.7;
        }
.disclaimer-highlight {
            background: rgba(56,189,248,0.08);
            border-left: 4px solid var(--main);
            padding: 15px 20px;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 20px 0;
        }
.disclaimer-highlight p {
            margin-bottom: 0;
            font-style: italic;
        }
.update-date {
            display: inline-block;
            background: rgba(167,139,250,0.15);
            color: var(--accent);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.85rem;
            margin-bottom: 15px;
        }
.nav-link.disabled {
            color: var(--main) !important;
            opacity: 1;
            font-weight: 600;
        }

/* --- 子页面追加 --- */
/* 确保Bootstrap组件不会出现白底黑字，全部覆盖为本站配色 */
    .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);
      color: var(--text);
      border-color: var(--border-light);
    }
.accordion-button::after {
      filter: invert(80%);
    }
/* 自定义列表样式 */
    .privacy-list {
      list-style: none;
      padding-left: 0;
    }
.privacy-list li {
      padding: 0.65rem 0 0.65rem 2rem;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="%23a78bfa" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M22 11.08V12a10 10 0 1 1-5.93-9.14"/><polyline points="22 4 12 14.01 9 11.01"/></svg>') left center no-repeat;
      background-size: 1.1rem;
    }
.privacy-list li strong {
      color: var(--main);
    }
.section-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow);
      border: 1px solid var(--border-light);
      margin-bottom: 2rem;
    }
.last-updated {
      color: var(--accent);
      font-size: 0.9rem;
      letter-spacing: 0.5px;
    }

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