:root {
            --primary: #64748b;
            --accent: #94a3b8;
            --bg: #f1f5f9;
            --text: #1e293b;
            --border: #d9e2ef;
            --white: #ffffff;
            --shadow: 0 4px 20px rgba(0,0,0,0.03);
        }

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

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--bg);
            color: var(--text);
            overflow-x: hidden;
        }

        /* 细微噪点纹理 (顶部叠加) */
        body::before {
            content: "";
            position: fixed;
            top: 0; left: 0;
            width: 100%; height: 300px;
            background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.7' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.02'/%3E%3C/svg%3E");
            pointer-events: none;
            z-index: 0;
        }

        /* 固定侧栏 */
        .left-sidebar {
            position: fixed;
            left: 0;
            top: 0;
            width: 220px;
            height: 100vh;
            background: var(--white);
            border-right: 1px solid var(--border);
            padding: 28px 18px;
            z-index: 100;
            display: flex;
            flex-direction: column;
        }

        .sidebar-brand {
            font-size: 1.5rem;
            font-weight: 900;
            color: var(--text);
            letter-spacing: -0.02em;
            margin-bottom: 30px;
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
        }
        .sidebar-brand i { color: var(--primary); font-size: 1.4rem; }

        .sidebar-nav {
            list-style: none;
            flex-grow: 1;
        }
        .sidebar-nav li { margin-bottom: 8px; }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 12px;
            border-radius: 8px;
            color: var(--text);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.2s;
            font-size: 0.95rem;
        }
        .sidebar-nav a:hover {
            background: var(--bg);
            color: var(--primary);
        }
        .sidebar-nav a i {
            width: 20px;
            color: var(--accent);
        }

        .sidebar-footer {
            font-size: 0.8rem;
            color: var(--accent);
            border-top: 1px solid var(--border);
            padding-top: 16px;
            text-align: left;
        }

        /* 主容器：右侧留白 */
        .main-wrapper {
            margin-left: 220px;
            min-height: 100vh;
            position: relative;
            z-index: 2;
        }

        /* Hero 区块：视差效果 */
        .hero-section {
            position: relative;
            min-height: 90vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: #fff;
            background-size: cover;
            background-position: center;
            background-attachment: fixed; /* 视差 */
            background-image: linear-gradient(rgba(30,41,59,0.7), rgba(30,41,59,0.7)), url('{随机图片}');
        }

        .hero-content h1 {
            font-size: 4rem;
            font-weight: 900;
            letter-spacing: -0.03em;
            text-shadow: 0 4px 30px rgba(0,0,0,0.3);
            line-height: 1.2;
        }
        .hero-content p {
            font-size: 1.3rem;
            max-width: 700px;
            margin: 20px auto 32px;
            opacity: 0.9;
            font-weight: 300;
        }
        .hero-btn {
            background: var(--white);
            color: var(--text);
            padding: 14px 36px;
            border-radius: 40px;
            font-weight: 600;
            text-decoration: none;
            display: inline-block;
            transition: all 0.3s ease;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            position: relative;
            overflow: hidden;
            z-index: 1;
        }
        .hero-btn::after {
            content: "";
            position: absolute;
            top: 0; left: -80%;
            width: 40%; height: 100%;
            background: linear-gradient(100deg, transparent, rgba(255,255,255,0.6), transparent);
            transform: skewX(-20deg);
            transition: left 0.5s;
            z-index: -1;
        }
        .hero-btn:hover::after {
            left: 120%;
        }

        /* 区块 */
        .section {
            padding: 90px 40px;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 20px;
        }
        .section-sub {
            color: var(--accent);
            font-weight: 400;
            margin-bottom: 50px;
        }

        /* 特色卡片网格 */
        .feature-card {
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 30px 28px;
            transition: 0.2s;
            box-shadow: var(--shadow);
        }
        .feature-card:hover {
            border-color: var(--primary);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 20px;
            font-weight: 300;
        }

        /* 对比表格 */
        .compare-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            background: var(--white);
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .compare-table th, .compare-table td {
            padding: 18px 20px;
            border-bottom: 1px solid var(--border);
            background: var(--white);
        }
        .compare-table thead th {
            background: var(--bg);
            font-weight: 700;
            color: var(--primary);
            font-size: 0.9rem;
            letter-spacing: 0.5px;
        }
        .compare-table .fa-check { color: var(--primary); }
        .compare-table .fa-minus { color: var(--accent); }
        .compare-table td .mono {
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-weight: 600;
            background: var(--bg);
            padding: 2px 8px;
            border-radius: 4px;
        }

        /* 编号清单 */
        .numbered-list {
            counter-reset: list-counter;
            list-style: none;
            padding-left: 0;
        }
        .numbered-list li {
            counter-increment: list-counter;
            position: relative;
            padding: 12px 0 12px 45px;
            border-bottom: 1px solid var(--border);
            font-size: 1.05rem;
        }
        .numbered-list li::before {
            content: counter(list-counter);
            position: absolute;
            left: 0;
            top: 12px;
            width: 28px;
            height: 28px;
            background: var(--primary);
            color: white;
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            font-size: 0.85rem;
            font-family: 'SF Mono', monospace;
        }

        /* FAQ */
        .faq-item {
            background: var(--white);
            border-radius: 8px;
            padding: 24px 28px;
            border: 1px solid var(--border);
            margin-bottom: 16px;
            box-shadow: var(--shadow);
        }
        .faq-item h5 {
            font-weight: 700;
            color: var(--text);
            margin-bottom: 10px;
        }

        /* CTA */
        .cta-box {
            background: var(--primary);
            border-radius: 8px;
            padding: 60px 40px;
            color: white;
            text-align: center;
        }
        .cta-box .btn {
            background: white;
            color: var(--primary);
            font-weight: 700;
            border-radius: 40px;
            padding: 12px 36px;
            text-decoration: none;
            display: inline-block;
            margin-top: 20px;
            transition: 0.2s;
        }

        /* 回到顶部按钮 */
        .to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 46px;
            height: 46px;
            border-radius: 50%;
            background: var(--primary);
            color: white;
            border: none;
            font-size: 1.2rem;
            box-shadow: 0 6px 18px rgba(0,0,0,0.1);
            opacity: 0;
            visibility: hidden;
            transition: 0.3s;
            z-index: 99;
        }
        .to-top.show {
            opacity: 1;
            visibility: visible;
        }

        /* 友情链接 */
        .friend-links {
            border-top: 1px solid var(--border);
            padding: 40px 40px;
            background: var(--white);
        }
        .friend-links h6 {
            font-weight: 700;
            color: var(--text);
        }

        /* 响应式 */
        @media (max-width: 992px) {
            .left-sidebar {
                display: none; /* 移动端侧栏隐藏，使用顶部导航(简略) */
            }
            .main-wrapper {
                margin-left: 0;
            }
            .hero-content h1 {
                font-size: 2.4rem;
            }
            .section { padding: 60px 20px; }
        }

        /* 移动端简易横向导航 */
        .mobile-nav {
            display: none;
            position: sticky;
            top: 0;
            background: rgba(255,255,255,0.9);
            backdrop-filter: blur(6px);
            z-index: 50;
            padding: 12px 20px;
            border-bottom: 1px solid var(--border);
        }
        .mobile-nav .brand {
            font-weight: 800;
            color: var(--text);
            text-decoration: none;
            margin-right: 20px;
        }
        .mobile-nav .nav-links a {
            margin-right: 15px;
            color: var(--text);
            text-decoration: none;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .mobile-nav { display: flex; align-items: center; }
        }

/* --- 子页面追加 --- */
/* 关于我们页面专属样式 */
        .about-hero {
            padding: 80px 0 50px;
            text-align: center;
            background: linear-gradient(135deg, rgba(100,116,139,0.08) 0%, rgba(148,163,184,0.05) 50%, rgba(241,245,249,0) 100%);
            border-bottom: 1px solid var(--border);
        }
.about-hero h1 {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }
.about-hero h1 span {
            color: var(--primary);
        }
.about-hero p {
            font-size: 1.1rem;
            color: var(--accent);
            max-width: 700px;
            margin: 0 auto;
            line-height: 1.7;
        }
.about-content {
            padding: 60px 0;
        }
.about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            margin-bottom: 60px;
        }
.about-grid.single {
            grid-template-columns: 1fr;
        }
.about-card {
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 36px;
            box-shadow: var(--shadow);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }
.about-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 30px rgba(0,0,0,0.06);
        }
.about-card h2 {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
.about-card h2 i {
            color: var(--primary);
            font-size: 1.2rem;
        }
.about-card p {
            color: var(--text);
            line-height: 1.8;
            font-size: 0.95rem;
            opacity: 0.9;
        }
.about-card ul {
            padding-left: 20px;
            color: var(--text);
            line-height: 1.8;
            font-size: 0.95rem;
            opacity: 0.9;
        }
.about-card ul li {
            margin-bottom: 8px;
        }
.about-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin: 40px 0 60px;
        }
.stat-item {
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 24px;
            text-align: center;
            box-shadow: var(--shadow);
        }
.stat-item .stat-num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            display: block;
            margin-bottom: 6px;
        }
.stat-item .stat-label {
            font-size: 0.9rem;
            color: var(--accent);
            font-weight: 500;
        }
.about-timeline {
            position: relative;
            padding-left: 30px;
            border-left: 3px solid var(--border);
            margin: 20px 0 0;
        }
.timeline-item {
            position: relative;
            margin-bottom: 30px;
        }
.timeline-item::before {
            content: '';
            position: absolute;
            left: -38px;
            top: 5px;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--primary);
            border: 3px solid var(--bg);
        }
.timeline-item h3 {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 6px;
        }
.timeline-item .timeline-date {
            font-size: 0.85rem;
            color: var(--primary);
            font-weight: 600;
            margin-bottom: 6px;
        }
.timeline-item p {
            font-size: 0.9rem;
            color: var(--text);
            line-height: 1.7;
            opacity: 0.85;
        }
.about-cta {
            text-align: center;
            padding: 60px 0;
            background: var(--bg);
            border-radius: 16px;
            margin: 40px 0 0;
            border: 1px solid var(--border);
        }
.about-cta h2 {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 16px;
        }
.about-cta p {
            color: var(--accent);
            margin-bottom: 30px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.7;
        }
.about-hero {
                padding: 50px 0 40px;
            }
.about-hero h1 {
                font-size: 1.8rem;
            }
.about-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
.about-stats {
                grid-template-columns: repeat(2, 1fr);
            }
.about-card {
                padding: 24px;
            }

/* --- 子页面追加 --- */
/* 本页专属补充样式 */
        .disclaimer-section { padding: 60px 0; }
.disclaimer-card { background: var(--white); border: 1px solid var(--border); border-radius: 12px; padding: 32px; margin-bottom: 24px; box-shadow: var(--shadow); }
.disclaimer-card h2 { color: var(--primary); font-size: 1.5rem; font-weight: 700; margin-bottom: 16px; display: flex; align-items: center; gap: 10px; }
.disclaimer-card h2 i { color: var(--accent); font-size: 1.3rem; }
.disclaimer-card p, .disclaimer-card li { color: var(--text); line-height: 1.8; font-size: 0.95rem; }
.disclaimer-card ul { padding-left: 20px; margin-bottom: 16px; }
.disclaimer-card li { margin-bottom: 8px; }
.disclaimer-highlight { background: var(--bg); border-left: 4px solid var(--primary); padding: 16px 20px; border-radius: 0 8px 8px 0; margin: 16px 0; }
.disclaimer-highlight p { margin: 0; font-style: italic; }
.last-updated { color: var(--accent); font-size: 0.85rem; margin-bottom: 32px; display: block; }
.hero-section h1 { color: var(--white); }
.hero-section .hero-sub { color: rgba(255,255,255,0.9); }
.hero-btn:hover { background: var(--bg); color: var(--primary); }
.disclaimer-card { padding: 24px; }
.disclaimer-card h2 { font-size: 1.2rem; }

/* --- 子页面追加 --- */
/* 本页专属微调样式 */
        .privacy-section {
            background: var(--white);
            border-radius: 12px;
            padding: 2.5rem;
            margin-bottom: 1.5rem;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }
.privacy-section h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 1.25rem;
            padding-bottom: 0.75rem;
            border-bottom: 2px solid var(--border);
        }
.privacy-section h3 {
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--text);
            margin-top: 1.5rem;
            margin-bottom: 0.75rem;
        }
.privacy-section p, .privacy-section li {
            font-size: 0.95rem;
            line-height: 1.8;
            color: var(--text);
        }
.privacy-section ul {
            padding-left: 1.25rem;
            margin-bottom: 1rem;
        }
.privacy-section ul li {
            margin-bottom: 0.5rem;
            position: relative;
        }
.privacy-section ul li::before {
            content: "▸";
            color: var(--accent);
            position: absolute;
            left: -1.1rem;
        }
.privacy-note {
            background: var(--bg);
            border-left: 4px solid var(--primary);
            padding: 1.25rem;
            border-radius: 0 8px 8px 0;
            margin: 1.5rem 0;
        }
.privacy-note p {
            margin-bottom: 0;
            font-size: 0.9rem;
        }
.privacy-section {
                padding: 1.5rem;
            }