:root {
        --primary: #38bdf8;
        --accent: #a78bfa;
        --bg: #0f172a;
        --text: #e2e8f0;
        --card-bg: rgba(30, 41, 59, 0.6);
        --radius-lg: 24px;
        --radius-md: 18px;
        --radius-sm: 12px;
        --shadow: 0 20px 35px -8px rgba(0, 0, 0, 0.6), 0 5px 15px rgba(0, 0, 0, 0.4);
        --shadow-soft: 0 10px 30px -5px rgba(56, 189, 248, 0.1);
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body {
        background-color: var(--bg);
        color: var(--text);
        font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
        line-height: 1.6;
        overflow-x: hidden;
        background-image: radial-gradient(circle at 25% 20%, rgba(56,189,248,0.08) 0%, transparent 30%),
                          radial-gradient(circle at 80% 70%, rgba(167,139,250,0.08) 0%, transparent 30%);
        background-attachment: fixed;
    }
    /* 点阵纹理 */
    body::before {
        content: '';
        position: fixed;
        inset: 0;
        background-image: radial-gradient(rgba(226,232,240,0.02) 1px, transparent 1px);
        background-size: 22px 22px;
        pointer-events: none;
        z-index: 0;
    }

    /* 大圆角 & 卡片 */
    .glass-card {
        background: var(--card-bg);
        backdrop-filter: blur(8px);
        border: 1px solid rgba(255,255,255,0.05);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-soft);
        transition: transform 0.2s, border-color 0.2s;
    }
    .glass-card:hover {
        border-color: rgba(56,189,248,0.25);
        transform: translateY(-2px);
    }

    /* 侧栏布局 (桌面左侧固定) */
    .sidebar-layout {
        display: flex;
        gap: 2rem;
        max-width: 1600px;
        margin: 0 auto;
        padding: 0 2rem 4rem;
        position: relative;
        z-index: 2;
    }
    .sidebar {
        flex: 0 0 260px;
        position: sticky;
        top: 90px;
        height: fit-content;
        align-self: flex-start;
        border-radius: var(--radius-lg);
        background: rgba(15, 23, 42, 0.7);
        backdrop-filter: blur(12px);
        padding: 1.8rem 1.2rem;
        box-shadow: var(--shadow);
        border: 1px solid rgba(255,255,255,0.04);
    }
    .sidebar .side-nav-title {
        font-size: 0.9rem;
        letter-spacing: 2px;
        color: var(--primary);
        text-transform: uppercase;
        margin-bottom: 1.5rem;
        font-weight: 600;
    }
    .sidebar a {
        display: block;
        color: var(--text);
        text-decoration: none;
        padding: 0.7rem 1rem;
        border-radius: 999px;
        font-weight: 500;
        margin-bottom: 0.3rem;
        transition: 0.2s;
    }
    .sidebar a i { margin-right: 0.8rem; color: var(--accent); width: 18px; text-align: center; }
    .sidebar a:hover { background: rgba(56,189,248,0.12); color: white; }
    .sidebar .active-link { background: rgba(56,189,248,0.15); color: white; }

    .main-content {
        flex: 1;
        min-width: 0;
    }

    /* Hero渐变文字+浮动装饰 */
    .hero-section {
        padding: 3rem 0 2rem;
        position: relative;
    }
    .gradient-text {
        background: linear-gradient(135deg, var(--primary), var(--accent) 70%);
        -webkit-background-clip: text;
        background-clip: text;
        color: transparent;
        display: inline-block;
    }
    .float-deco {
        position: absolute;
        width: 120px;
        height: 120px;
        border-radius: 50%;
        filter: blur(40px);
        opacity: 0.3;
        pointer-events: none;
        z-index: -1;
    }
    .float-deco.deco1 { background: var(--primary); top: 10px; right: 10%; }
    .float-deco.deco2 { background: var(--accent); bottom: 20px; left: 5%; width: 200px; height: 200px; }

    /* 导航栏吸顶 */
    .navbar-custom {
        position: sticky;
        top: 0;
        z-index: 1000;
        background: rgba(15, 23, 42, 0.7);
        backdrop-filter: blur(18px);
        border-bottom: 1px solid rgba(255,255,255,0.03);
        padding: 0.7rem 2rem;
        transition: background 0.3s;
        border-radius: 0;
    }
    .navbar-custom.scrolled {
        background: rgba(10, 15, 30, 0.92);
        backdrop-filter: blur(25px);
    }
    .navbar-custom .navbar-brand {
        font-weight: 800;
        font-size: 1.5rem;
        color: var(--text);
        letter-spacing: -0.5px;
    }
    .navbar-custom .navbar-brand i { color: var(--primary); margin-right: 6px; }
    .nav-link-custom {
        color: var(--text) !important;
        font-weight: 500;
        margin: 0 0.4rem;
        border-radius: 40px;
        padding: 0.5rem 1rem !important;
        transition: 0.2s;
    }
    .nav-link-custom:hover { background: rgba(56,189,248,0.15); color: white !important; }

    /* 编号清单 */
    .step-list {
        counter-reset: step;
        list-style: none;
        padding: 0;
    }
    .step-list li {
        counter-increment: step;
        display: flex;
        gap: 1rem;
        align-items: flex-start;
        padding: 1.2rem 0;
        border-bottom: 1px dashed rgba(255,255,255,0.08);
    }
    .step-list li::before {
        content: counter(step, decimal-leading-zero);
        font-weight: 800;
        font-size: 1.8rem;
        line-height: 1;
        color: transparent;
        background: linear-gradient(145deg, var(--primary), var(--accent));
        -webkit-background-clip: text;
        background-clip: text;
        min-width: 3.2rem;
    }

    /* 对比表格 */
    .compare-table {
        width: 100%;
        border-collapse: separate;
        border-spacing: 0 12px;
    }
    .compare-table th, .compare-table td {
        padding: 1.2rem 1.5rem;
        background: rgba(15, 23, 42, 0.6);
        backdrop-filter: blur(4px);
    }
    .compare-table th:first-child { border-radius: var(--radius-md) 0 0 var(--radius-md); }
    .compare-table th:last-child { border-radius: 0 var(--radius-md) var(--radius-md) 0; }
    .compare-table td:first-child { border-radius: var(--radius-md) 0 0 var(--radius-md); }
    .compare-table td:last-child { border-radius: 0 var(--radius-md) var(--radius-md) 0; }
    .compare-table .badge-primary { background: var(--primary); color: #0f172a; }

    /* 图片hover放大 + 遮罩 */
    .img-hover-wrapper {
        position: relative;
        border-radius: var(--radius-md);
        overflow: hidden;
        aspect-ratio: 2/3;
    }
    .img-hover-wrapper img {
        width: 100%; height: 100%; object-fit: cover;
        transition: transform 0.5s ease;
        display: block;
    }
    .img-hover-wrapper .overlay-gradient {
        position: absolute; inset: 0;
        background: linear-gradient(to top, rgba(15,23,42,0.9), transparent 40%);
        opacity: 0;
        transition: opacity 0.3s;
        display: flex; align-items: flex-end; padding: 1rem;
    }
    .img-hover-wrapper:hover img { transform: scale(1.08); }
    .img-hover-wrapper:hover .overlay-gradient { opacity: 1; }

    /* 数字增长统计 */
    .stats-number {
        font-size: 3rem; font-weight: 800;
        background: linear-gradient(145deg, var(--primary), var(--accent));
        -webkit-background-clip: text; background-clip: text; color: transparent;
        display: inline-block;
    }

    /* CTA */
    .cta-box {
        border-radius: var(--radius-lg);
        background: linear-gradient(130deg, rgba(56,189,248,0.15), rgba(167,139,250,0.15));
        border: 1px solid rgba(255,255,255,0.08);
    }

    /* 移动端折叠侧栏 */
    @media (max-width: 992px) {
        .sidebar-layout { flex-direction: column; padding: 0 1rem 3rem; }
        .sidebar { position: static; width: 100%; flex: auto; }
        .main-content { width: 100%; }
        .navbar-custom { padding: 0.6rem 1rem; }
    }

    /* 友情链接区 */
    .friend-links {
        border-top: 1px solid rgba(255,255,255,0.06);
        padding: 2rem 0;
        margin-top: 2rem;
    }

    .section-title {
        font-weight: 800;
        letter-spacing: -0.02em;
        margin-bottom: 1.5rem;
    }
    .badge-accent { background: var(--accent); color: #0f172a; }
    a { color: var(--primary); }
    footer { border-top: 1px solid rgba(255,255,255,0.04); }

/* --- 子页面追加 --- */
/* 本页专属微调 */
        .about-hero { position: relative; overflow: hidden; padding: 4rem 0 3rem; }
.about-hero::before { content: ''; position: absolute; top: -80px; right: -80px; width: 280px; height: 280px; border-radius: 50%; background: radial-gradient(circle, rgba(167, 139, 250, 0.15), transparent 70%); pointer-events: none; }
.about-hero::after { content: ''; position: absolute; bottom: -40px; left: -40px; width: 200px; height: 200px; border-radius: 50%; background: radial-gradient(circle, rgba(56, 189, 248, 0.12), transparent 70%); pointer-events: none; }
.about-hero .container { position: relative; z-index: 2; }
.philosophy-card { background: var(--card-bg); border: 1px solid rgba(255,255,255,0.08); border-radius: var(--radius-lg); padding: 2rem; height: 100%; transition: transform .3s ease, box-shadow .3s ease; }
.philosophy-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.philosophy-icon { font-size: 2rem; color: var(--primary); margin-bottom: 1rem; }
.about-section { padding: 3rem 0; }
.section-tag { display: inline-block; background: rgba(56, 189, 248, 0.12); color: var(--primary); padding: 0.35rem 1rem; border-radius: 50px; font-size: 0.85rem; font-weight: 600; letter-spacing: 0.5px; margin-bottom: 1.5rem; }
.about-list { list-style: none; padding-left: 0; }
.about-list li { position: relative; padding-left: 1.8rem; margin-bottom: 0.8rem; color: var(--text); opacity: 0.9; }
.about-list li::before { content: '\f058'; font-family: 'Font Awesome 6 Free'; font-weight: 900; position: absolute; left: 0; top: 0; color: var(--primary); font-size: 1rem; }
.quote-block { border-left: 4px solid var(--accent); padding: 1.2rem 1.5rem; background: rgba(167, 139, 250, 0.06); border-radius: 0 var(--radius-md) var(--radius-md) 0; margin: 2rem 0; font-style: italic; }
.timeline-item { display: flex; gap: 1.5rem; margin-bottom: 2rem; position: relative; }
.timeline-item::before { content: ''; position: absolute; left: 0.65rem; top: 2rem; bottom: -2rem; width: 2px; background: linear-gradient(to bottom, var(--primary), transparent); }
.timeline-item:last-child::before { display: none; }
.timeline-dot { width: 1.4rem; height: 1.4rem; border-radius: 50%; background: var(--primary); border: 3px solid var(--bg); box-shadow: 0 0 0 2px var(--primary); flex-shrink: 0; margin-top: 0.2rem; }
.timeline-content { flex: 1; }
.timeline-content h4 { color: var(--primary); font-size: 1.1rem; font-weight: 700; margin-bottom: 0.4rem; }
.timeline-content p { font-size: 0.95rem; opacity: 0.85; }
.nav-link-custom.active { color: var(--primary) !important; }

/* --- 子页面追加 --- */
.privacy-card { background: var(--card-bg); border-radius: var(--radius-lg); padding: 2rem; box-shadow: var(--shadow); }
.privacy-section { margin-bottom: 2.5rem; }
.privacy-section h2 { color: var(--primary); font-weight: 700; margin-bottom: 1.2rem; }
.privacy-section h3 { color: var(--text); font-weight: 600; margin-bottom: 1rem; }
.privacy-section p { color: var(--text); line-height: 1.8; margin-bottom: 1rem; }
.privacy-section ul { color: var(--text); padding-left: 1.5rem; margin-bottom: 1rem; }
.privacy-section li { margin-bottom: 0.5rem; line-height: 1.7; }
.privacy-highlight { border-left: 4px solid var(--accent); padding-left: 1.2rem; margin: 1.5rem 0; }
.privacy-highlight p { color: var(--accent); font-weight: 500; }
.update-date { color: var(--primary); font-size: 0.9rem; margin-bottom: 2rem; }
.table-of-contents { background: rgba(167, 139, 250, 0.1); border-radius: var(--radius-md); padding: 1.5rem; margin-bottom: 2.5rem; }
.table-of-contents a { color: var(--primary); text-decoration: none; display: block; padding: 0.3rem 0; transition: color 0.3s; }
.table-of-contents a:hover { color: var(--accent); }
.privacy-card { border: 1px solid rgba(56, 189, 248, 0.15); }
.contact-info { background: rgba(56, 189, 248, 0.08); border-radius: var(--radius-md); padding: 1.5rem; margin-top: 1.5rem; }
.contact-info p { margin-bottom: 0.5rem; }
.contact-info i { color: var(--primary); margin-right: 0.5rem; width: 20px; }

/* --- Bootstrap 组件配色适配(程序自动补,避免白底黑字) --- */
.accordion-item { background:rgba(255,255,255,.04) !important; color:#e2e8f0 !important; border-color:rgba(255,255,255,.12) !important; }
.accordion-button { background:rgba(255,255,255,.04) !important; color:#e2e8f0 !important; }
.accordion-body { background:transparent !important; color:#e2e8f0 !important; }
.accordion-header { background:transparent !important; }
.accordion-button::after { filter: invert(1) grayscale(1) brightness(2); }