:root {
        --primary: #2563eb;
        --accent: #06b6d4;
        --bg: #f8fafc;
        --text: #0f172a;
        --card-bg: #ffffff;
        --border: #e2e8f0;
        --shadow: 0 4px 24px rgba(37, 99, 235, 0.08);
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body {
        background: var(--bg);
        color: var(--text);
        font-family: 'Inter', -apple-system, sans-serif;
        line-height: 1.65;
        overflow-x: hidden;
    }
    /* 顶部噪点纹理 */
    .noise-overlay {
        position: fixed;
        top: 0; left: 0;
        width: 100%; height: 100%;
        pointer-events: none;
        z-index: 9999;
        opacity: 0.04;
        background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    }
    /* 滚动进度条 */
    .scroll-progress {
        position: fixed;
        top: 0; left: 0;
        height: 3px;
        background: linear-gradient(90deg, var(--primary), var(--accent));
        z-index: 1100;
        width: 0%;
        transition: width 0.15s ease-out;
    }
    /* 导航栏 */
    .navbar-custom {
        background: rgba(248, 250, 252, 0.8);
        backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border);
        transition: all 0.3s ease;
        padding: 1rem 0;
    }
    .navbar-custom.scrolled {
        background: rgba(255, 255, 255, 0.95);
        box-shadow: 0 4px 30px rgba(15, 23, 42, 0.06);
        padding: 0.6rem 0;
    }
    .navbar-brand {
        font-weight: 900;
        font-size: 1.5rem;
        color: var(--text) !important;
        letter-spacing: -0.02em;
    }
    .navbar-brand i { color: var(--primary); margin-right: 6px; }
    .nav-link {
        font-weight: 600;
        color: var(--text) !important;
        font-size: 0.95rem;
        padding: 0.5rem 1rem !important;
        border-radius: 999px;
        transition: all 0.2s;
    }
    .nav-link:hover {
        background: rgba(37, 99, 235, 0.08);
        color: var(--primary) !important;
    }
    .navbar-toggler { border: none; }
    .navbar-toggler:focus { box-shadow: none; }

    /* Hero 区 */
    .hero {
        padding: 8rem 0 5rem;
        text-align: center;
    }
    .hero h1 {
        font-size: clamp(2.8rem, 7vw, 5rem);
        font-weight: 900;
        letter-spacing: -0.04em;
        line-height: 1.1;
        margin-bottom: 1.5rem;
    }
    .hero h1 span {
        background: linear-gradient(135deg, var(--primary), var(--accent));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    .hero-sub {
        font-size: 1.2rem;
        color: #475569;
        max-width: 600px;
        margin: 0 auto 2.5rem;
        font-weight: 400;
    }
    .keyword-cloud {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.6rem;
        margin-bottom: 3rem;
        max-width: 700px;
        margin-left: auto;
        margin-right: auto;
    }
    .keyword-tag {
        background: white;
        border: 1px solid var(--border);
        border-radius: 999px;
        padding: 0.4rem 1.2rem;
        font-size: 0.9rem;
        font-weight: 500;
        color: #475569;
        box-shadow: 0 2px 8px rgba(0,0,0,0.03);
        transition: all 0.2s;
        cursor: default;
    }
    .keyword-tag:hover {
        border-color: var(--primary);
        color: var(--primary);
        transform: translateY(-2px);
        box-shadow: 0 6px 16px rgba(37, 99, 235, 0.1);
    }
    .btn-hero {
        background: var(--primary);
        color: white;
        border: none;
        border-radius: 999px;
        padding: 0.9rem 2.4rem;
        font-weight: 600;
        font-size: 1rem;
        transition: all 0.3s;
        box-shadow: 0 4px 20px rgba(37, 99, 235, 0.3);
    }
    .btn-hero:hover {
        background: #1d4ed8;
        transform: translateY(-2px);
        box-shadow: 0 8px 30px rgba(37, 99, 235, 0.4);
        color: white;
    }

    /* 区块通用 */
    .section {
        padding: 5rem 0;
    }
    .section-label {
        display: inline-block;
        background: rgba(37, 99, 235, 0.08);
        color: var(--primary);
        border-radius: 999px;
        padding: 0.3rem 1.2rem;
        font-size: 0.85rem;
        font-weight: 700;
        margin-bottom: 1rem;
        letter-spacing: 0.03em;
    }
    .section-title {
        font-size: 2.2rem;
        font-weight: 900;
        letter-spacing: -0.02em;
        margin-bottom: 1rem;
        color: var(--text);
    }
    .section-desc {
        color: #64748b;
        max-width: 640px;
        margin: 0 auto 3rem;
        font-size: 1.05rem;
    }

    /* 长文介绍 */
    .story-card {
        background: var(--card-bg);
        border-radius: 24px;
        padding: 3rem;
        box-shadow: var(--shadow);
        border: 1px solid var(--border);
        max-width: 860px;
        margin: 0 auto;
    }
    .story-card p {
        color: #334155;
        font-size: 1.02rem;
        margin-bottom: 1.2rem;
        line-height: 1.8;
    }
    .story-card .lead-text {
        font-size: 1.15rem;
        color: var(--text);
        font-weight: 500;
        border-left: 4px solid var(--accent);
        padding-left: 1.2rem;
    }
    .stat-row {
        display: flex;
        gap: 2rem;
        margin-top: 2rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    .stat-item {
        text-align: center;
    }
    .stat-number {
        font-family: 'JetBrains Mono', 'Courier New', monospace;
        font-size: 2.2rem;
        font-weight: 800;
        color: var(--primary);
    }
    .stat-label {
        font-size: 0.85rem;
        color: #64748b;
        font-weight: 500;
    }

    /* 对比表格 */
    .table-wrapper {
        max-width: 860px;
        margin: 0 auto;
        background: white;
        border-radius: 24px;
        padding: 2rem;
        box-shadow: var(--shadow);
        border: 1px solid var(--border);
        overflow-x: auto;
    }
    .table-wrapper table {
        margin: 0;
        min-width: 600px;
    }
    .table-wrapper th {
        font-weight: 700;
        color: var(--text);
        border-bottom: 2px solid var(--primary);
        padding: 1rem 1.2rem;
        background: transparent;
    }
    .table-wrapper td {
        padding: 1rem 1.2rem;
        border-bottom: 1px solid var(--border);
        color: #334155;
        font-size: 0.95rem;
    }
    .table-wrapper tr:last-child td { border-bottom: none; }
    .table-wrapper .fa-check { color: #10b981; margin-right: 6px; }
    .table-wrapper .fa-xmark { color: #ef4444; margin-right: 6px; }
    .table-wrapper .fa-minus { color: #94a3b8; margin-right: 6px; }

    /* FAQ 手风琴 */
    .faq-wrap {
        max-width: 800px;
        margin: 0 auto;
    }
    .accordion-item {
        border: 1px solid var(--border);
        border-radius: 16px !important;
        margin-bottom: 0.8rem;
        background: white;
        overflow: hidden;
        transition: all 0.2s;
    }
    .accordion-item:hover {
        border-color: var(--primary);
        box-shadow: 0 4px 16px rgba(37, 99, 235, 0.06);
    }
    .accordion-button {
        background: white;
        color: var(--text);
        font-weight: 600;
        font-size: 1rem;
        padding: 1.2rem 1.4rem;
    }
    .accordion-button:not(.collapsed) {
        background: rgba(37, 99, 235, 0.03);
        color: var(--primary);
    }
    .accordion-button:focus {
        box-shadow: none;
        border-color: transparent;
    }
    .accordion-button::after {
        background-size: 1rem;
    }
    .accordion-body {
        padding: 1rem 1.4rem 1.4rem;
        color: #475569;
        font-size: 0.95rem;
        line-height: 1.7;
    }

    /* 特色卡片 */
    .feature-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: 1.5rem;
        max-width: 1000px;
        margin: 0 auto;
    }
    .feature-card {
        background: white;
        border: 1px solid var(--border);
        border-radius: 20px;
        padding: 2rem 1.8rem;
        transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        text-align: left;
    }
    .feature-card:hover {
        transform: translateY(-8px);
        box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
        border-color: rgba(37, 99, 235, 0.2);
    }
    .feature-icon {
        width: 56px;
        height: 56px;
        border-radius: 16px;
        display: flex;
        align-items: center;
        justify-content: center;
        background: rgba(37, 99, 235, 0.08);
        color: var(--primary);
        font-size: 1.5rem;
        margin-bottom: 1.4rem;
        border: 1px solid rgba(37, 99, 235, 0.15);
    }
    .feature-card h4 {
        font-weight: 700;
        font-size: 1.15rem;
        margin-bottom: 0.7rem;
    }
    .feature-card p {
        color: #64748b;
        font-size: 0.92rem;
        line-height: 1.6;
        margin: 0;
    }

    /* CTA */
    .cta-section {
        padding: 5rem 0 6rem;
    }
    .cta-card {
        background: linear-gradient(135deg, var(--primary), var(--accent));
        border-radius: 32px;
        padding: 4rem 2rem;
        text-align: center;
        color: white;
        max-width: 900px;
        margin: 0 auto;
        position: relative;
        overflow: hidden;
    }
    .cta-card h2 {
        font-weight: 900;
        font-size: 2.5rem;
        margin-bottom: 1rem;
        letter-spacing: -0.02em;
    }
    .cta-card p {
        opacity: 0.95;
        font-size: 1.1rem;
        margin-bottom: 2rem;
        max-width: 500px;
        margin-left: auto;
        margin-right: auto;
    }
    .btn-cta {
        background: white;
        color: var(--primary);
        border: none;
        border-radius: 999px;
        padding: 0.9rem 3rem;
        font-weight: 700;
        font-size: 1.05rem;
        transition: all 0.3s;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    }
    .btn-cta:hover {
        transform: translateY(-3px) scale(1.02);
        box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
        background: white;
        color: var(--primary);
    }

    /* 友链 */
    .friend-links {
        padding: 3rem 0;
        border-top: 1px solid var(--border);
        background: white;
    }
    .friend-links h5 {
        font-weight: 700;
        font-size: 1rem;
        color: var(--text);
        margin-bottom: 1.2rem;
        text-align: center;
    }
    .friend-links .links {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    .friend-links a {
        color: #64748b;
        text-decoration: none;
        font-size: 0.9rem;
        padding: 0.3rem 0.8rem;
        border-radius: 999px;
        border: 1px solid var(--border);
        background: var(--bg);
        transition: all 0.2s;
    }
    .friend-links a:hover {
        color: var(--primary);
        border-color: var(--primary);
        background: white;
    }

    /* 页脚 */
    footer {
        background: white;
        border-top: 1px solid var(--border);
        padding: 2rem 0;
        text-align: center;
        color: #94a3b8;
        font-size: 0.85rem;
    }
    footer .brand {
        font-weight: 800;
        color: var(--text);
        font-size: 1rem;
        margin-bottom: 0.5rem;
    }
    footer a {
        color: #64748b;
        text-decoration: none;
        margin: 0 0.5rem;
    }
    footer a:hover { color: var(--primary); }

    /* 等宽字体 */
    .mono { font-family: 'JetBrains Mono', 'Courier New', monospace; }

    @media (max-width: 768px) {
        .hero { padding: 6rem 0 3rem; }
        .section { padding: 3.5rem 0; }
        .story-card { padding: 2rem; }
        .table-wrapper { padding: 1.2rem; }
        .cta-card { padding: 3rem 1.5rem; }
        .cta-card h2 { font-size: 1.8rem; }
        .section-title { font-size: 1.7rem; }
        .navbar-collapse {
            background: rgba(255,255,255,0.98);
            border-radius: 16px;
            padding: 1rem;
            margin-top: 0.5rem;
            box-shadow: 0 8px 30px rgba(0,0,0,0.08);
        }
    }

/* --- 子页面追加 --- */
/* 本页专属微调：注册表单卡片、步骤示意、特色列表 */
        .register-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 20px;
            box-shadow: var(--shadow);
            padding: 2rem;
        }
.form-control, .form-select {
            background: #ffffff;
            border: 1px solid var(--border);
            color: var(--text);
            padding: 0.75rem 1rem;
            border-radius: 12px;
        }
.form-control:focus, .form-select:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.1);
        }
.form-label {
            font-weight: 600;
            color: var(--text);
        }
.btn-primary-custom {
            background: var(--primary);
            border: none;
            color: #fff;
            padding: 0.75rem 1.5rem;
            border-radius: 30px;
            font-weight: 600;
            transition: background 0.2s;
            width: 100%;
        }
.btn-primary-custom:hover {
            background: #1d4ed8;
        }
.step-icon {
            background: var(--primary);
            color: #fff;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            margin-right: 12px;
            flex-shrink: 0;
        }
.benefit-icon {
            color: var(--primary);
            font-size: 1.4rem;
            width: 32px;
        }
.register-note {
            background: rgba(6, 182, 212, 0.08);
            border-left: 4px solid var(--accent);
            padding: 0.75rem 1rem;
            border-radius: 0 12px 12px 0;
            font-size: 0.9rem;
        }
.text-muted-custom {
            color: #475569;
        }
.bg-soft-primary {
            background: rgba(37, 99, 235, 0.04);
        }

/* --- 子页面追加 --- */
/* 由于站点CSS变量已定义，这里仅针对本页少量元素微调 */
        .about-hero {
            background: linear-gradient(135deg, rgba(37,99,235,0.05) 0%, rgba(6,182,212,0.05) 100%);
            border-bottom: 1px solid var(--border);
        }
.about-section-title {
            position: relative;
            display: inline-block;
            margin-bottom: 1.5rem;
        }
.about-section-title::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -8px;
            width: 60px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px;
        }
.about-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 1.8rem;
            transition: box-shadow .25s;
            box-shadow: 0 2px 12px rgba(0,0,0,0.03);
        }
.about-card:hover {
            box-shadow: var(--shadow);
        }
.about-stat-number {
            font-weight: 800;
            font-size: 2.2rem;
            color: var(--primary);
            line-height: 1.2;
        }
.about-stat-label {
            color: var(--text);
            opacity: 0.7;
            font-weight: 500;
        }
.icon-lg {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 1rem;
        }
.about-list-item {
            display: flex;
            align-items: flex-start;
            gap: 0.75rem;
            margin-bottom: 1.2rem;
        }
.about-list-item i {
            color: var(--accent);
            margin-top: 0.2rem;
        }
.about-quote {
            border-left: 4px solid var(--accent);
            padding-left: 1.5rem;
            font-style: italic;
            color: var(--text);
            opacity: 0.9;
        }
/* 覆盖bootstrap手风琴/卡片配色，保持风格一致 */
        .accordion-item, .accordion-button, .accordion-body {
            background: var(--card-bg) !important;
            color: var(--text) !important;
            border-color: var(--border) !important;
        }

/* --- 子页面追加 --- */
/* 本页专属微调，自动合并进站点CSS */
        .disclaimer-section { max-width: 900px; margin: 0 auto; }
.disclaimer-section h2 { margin-top: 2.5rem; margin-bottom: 1.2rem; font-weight: 700; color: var(--text); position: relative; padding-left: 1rem; }
.disclaimer-section h2::before { content: ''; position: absolute; left: 0; top: 0.2rem; width: 4px; height: 1.2em; background: var(--primary); border-radius: 2px; }
.disclaimer-section p { line-height: 1.9; color: #334155; margin-bottom: 1.2rem; }
.disclaimer-section ul { padding-left: 1.5rem; color: #334155; line-height: 1.9; }
.disclaimer-section li { margin-bottom: 0.6rem; }
.disclaimer-highlight { background: rgba(37, 99, 235, 0.06); border-left: 3px solid var(--primary); padding: 1.2rem 1.5rem; border-radius: 0 8px 8px 0; margin: 1.5rem 0; }
.disclaimer-meta { font-size: 0.9rem; color: #64748b; margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }
.disclaimer-meta span { margin-right: 1.5rem; }
.disclaimer-meta i { color: var(--primary); margin-right: 0.3rem; }
.disclaimer-section a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
.disclaimer-section a:hover { color: var(--accent); }
.nav-link.active-disclaimer { color: var(--primary) !important; font-weight: 700; position: relative; }
.nav-link.active-disclaimer::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 100%; height: 2px; background: var(--primary); border-radius: 2px; }

/* --- 子页面追加 --- */
/* 确保任何Bootstrap组件都不会出现白底黑字，但本页尽量不使用组件类 */
        /* 针对可能用到的工具类做微调 */
        .guide-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 1rem;
            padding: 1.5rem;
            height: 100%;
            box-shadow: var(--shadow);
            transition: transform .2s ease, box-shadow .2s;
        }
.guide-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 32px rgba(37, 99, 235, 0.12);
        }
.guide-icon {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 0.75rem;
        }
.step-dot {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 2rem;
            height: 2rem;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            font-weight: 700;
            margin-right: 0.5rem;
        }
.table-guide {
            width: 100%;
            border-collapse: collapse;
            background: transparent;
        }
.table-guide th, .table-guide td {
            padding: 0.9rem 1rem;
            border-bottom: 1px solid var(--border);
            color: var(--text);
        }
.table-guide thead th {
            background: rgba(37, 99, 235, 0.06);
            font-weight: 600;
            border-bottom: 2px solid var(--border);
            color: var(--text);
        }
/* 保证列表样式统一 */
        .guide-list li {
            margin-bottom: 0.6rem;
        }

/* --- 子页面追加 --- */
/* 覆盖 Bootstrap 组件默认配色，确保与站点风格统一 */
        .card, .card-body, .card-header, .card-footer {
            background: var(--card-bg);
            color: var(--text);
            border-color: var(--border);
        }
.list-group-item {
            background: var(--card-bg);
            color: var(--text);
            border-color: var(--border);
        }
.nav-link, .navbar-brand {
            color: var(--text) !important;
        }
.btn-outline-primary {
            border-color: var(--primary);
            color: var(--primary);
        }
.btn-outline-primary:hover {
            background: var(--primary);
            color: #fff;
        }
.table {
            --bs-table-bg: transparent;
            color: var(--text);
            border-color: var(--border);
        }
.table th, .table td {
            border-color: var(--border);
        }
/* 排行榜专属微调 */
        .rank-badge {
            display: inline-block;
            width: 2.2rem;
            height: 2.2rem;
            line-height: 2.2rem;
            border-radius: 50%;
            text-align: center;
            font-weight: 800;
            font-size: 0.9rem;
            background: var(--primary);
            color: #fff;
        }
.rank-badge.top-1 { background: #f59e0b; }
.rank-badge.top-2 { background: #94a3b8; }
.rank-badge.top-3 { background: #b45309; }
.rank-list-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 1rem 1.25rem;
            transition: box-shadow .2s, transform .2s;
        }
.rank-list-item:hover {
            box-shadow: var(--shadow);
            transform: translateY(-2px);
        }
.rank-tag {
            background: rgba(37, 99, 235, 0.1);
            color: var(--primary);
            font-weight: 600;
            font-size: 0.75rem;
            padding: 0.25rem 0.8rem;
            border-radius: 20px;
        }
/* 高亮当前导航项 */
        .navbar-nav .nav-link.active {
            color: var(--primary) !important;
            font-weight: 600;
        }

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