:root {
            --color-primary: #2F6FED;
            --color-primary-light: #EAF1FE;
            --color-primary-dark: #1d4ed8;
            --color-amber: #C08552;
            --color-bg-base: #F2F6FA;
            --color-card: #FFFFFF;
            --color-text: #1A2B3C;
            --color-text-secondary: #5B6B7F;
            --color-text-muted: #8A99AB;
            --color-border: #E4ECF5;
            --color-positive: #1FA67A;
            --color-warning: #E89333;
            --card-shadow: 0 8px 30px rgba(31, 54, 94, 0.08);
            --card-shadow-hover: 0 12px 40px rgba(31, 54, 94, 0.12);
            --radius-card: 20px;
            --radius-btn: 12px;
            --font-sans: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--color-bg-base);
            color: var(--color-text);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--color-primary-dark);
        }

        img {
            max-width: 100%;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }

        .container-site {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }

        /* 自定义组件类 */
        .card-base {
            background: var(--color-card);
            border-radius: var(--radius-card);
            border: 1px solid var(--color-border);
            box-shadow: var(--card-shadow);
            transition: box-shadow 0.3s ease, transform 0.3s ease, border-color 0.3s ease;
            overflow: hidden;
        }
        .card-base:hover {
            box-shadow: var(--card-shadow-hover);
            transform: translate(-2px, -2px);
            border-color: rgba(47, 111, 237, 0.2);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background-color: var(--color-primary);
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.75rem 1.75rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            box-shadow: 0 4px 14px rgba(47, 111, 237, 0.25);
        }
        .btn-primary:hover {
            background-color: var(--color-primary-dark);
            box-shadow: 0 6px 20px rgba(47, 111, 237, 0.35);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(47, 111, 237, 0.3);
        }
        .btn-primary:focus-visible {
            outline: 3px solid rgba(47, 111, 237, 0.4);
            outline-offset: 2px;
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: transparent;
            color: var(--color-primary);
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.75rem 1.75rem;
            border-radius: var(--radius-btn);
            border: 2px solid rgba(47, 111, 237, 0.35);
            cursor: pointer;
            transition: all 0.25s ease;
        }
        .btn-outline:hover {
            border-color: var(--color-amber);
            color: var(--color-amber);
            background: rgba(192, 133, 82, 0.06);
        }
        .btn-outline:active {
            transform: scale(0.98);
        }
        .btn-outline:focus-visible {
            outline: 3px solid rgba(192, 133, 82, 0.3);
            outline-offset: 2px;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            padding: 0.25rem 0.8rem;
            border-radius: 9999px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            line-height: 1.4;
        }

        .icon-circle {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 9999px;
            background: var(--color-primary-light);
            flex-shrink: 0;
        }

        .section-padding {
            padding-top: 56px;
            padding-bottom: 56px;
        }

        /* 导航 */
        .site-nav {
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(228, 236, 245, 0.8);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 10px rgba(31, 54, 94, 0.04);
        }
        .site-nav a {
            color: var(--color-text-secondary);
        }
        .site-nav a:hover {
            color: var(--color-primary);
        }
        .nav-channel {
            font-size: 0.88rem;
            font-weight: 500;
            padding: 0.5rem 0.85rem;
            border-radius: 9999px;
            transition: all 0.2s ease;
            color: var(--color-text-secondary) !important;
        }
        .nav-channel:hover {
            background: var(--color-primary-light);
            color: var(--color-primary) !important;
        }
        .nav-channel.active {
            background: var(--color-primary-light);
            color: var(--color-primary) !important;
            font-weight: 600;
        }

        .nav-search-input {
            border-radius: var(--radius-btn);
            border: 1px solid var(--color-border);
            padding: 0.45rem 1rem 0.45rem 2.4rem;
            font-size: 0.85rem;
            background: #fff;
            transition: border-color 0.2s, box-shadow 0.2s;
            width: 200px;
        }
        .nav-search-input:focus {
            outline: none;
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.12);
        }

        /* Hero */
        .hero-overlay {
            background: linear-gradient(105deg, rgba(26, 43, 60, 0.88) 0%, rgba(47, 111, 237, 0.82) 55%, rgba(47, 111, 237, 0.65) 100%);
        }

        /* 指标看板 */
        .stat-card {
            position: relative;
            overflow: hidden;
        }
        .stat-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            height: 3px;
            width: 0;
            background: var(--color-primary);
            transition: width 0.3s ease;
        }
        .stat-card:hover::before {
            width: 100%;
        }

        /* 结果对比 */
        .vs-badge {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            border-radius: 9999px;
            background: #fff;
            border: 2px solid var(--color-primary);
            color: var(--color-primary);
            font-weight: 800;
            font-size: 1.1rem;
            box-shadow: 0 4px 15px rgba(47, 111, 237, 0.2);
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            z-index: 2;
        }

        .progress-bar {
            height: 4px;
            border-radius: 9999px;
            background: var(--color-border);
            overflow: hidden;
            margin-top: 0.4rem;
        }
        .progress-bar .fill {
            height: 100%;
            border-radius: 9999px;
            background: linear-gradient(90deg, var(--color-primary), #5B8DEF);
        }

        /* FAQ */
        .faq-item {
            background: #fff;
            border-radius: 16px;
            border: 1px solid var(--color-border);
            transition: border-color 0.3s, box-shadow 0.3s;
            overflow: hidden;
        }
        .faq-item.active {
            border-color: var(--color-primary);
            box-shadow: 0 4px 20px rgba(47, 111, 237, 0.08);
        }
        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 9999px;
            background: var(--color-primary-light);
            color: var(--color-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 700;
            flex-shrink: 0;
            transition: transform 0.3s;
            line-height: 1;
        }

        /* 表单样式 */
        .form-input {
            width: 100%;
            padding: 0.65rem 1rem;
            border: 1px solid var(--color-border);
            border-radius: 12px;
            font-size: 0.92rem;
            background: #fff;
            transition: border-color 0.2s, box-shadow 0.2s;
            color: var(--color-text);
        }
        .form-input:focus {
            outline: none;
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.12);
        }

        /* 页脚 */
        .site-footer {
            background: #1A2B3C;
            color: #9AA7B8;
        }
        .site-footer a {
            color: #9AA7B8;
            transition: color 0.2s;
        }
        .site-footer a:hover {
            color: #fff;
        }

        /* 移动端导航 */
        .mobile-menu-panel {
            display: none;
        }
        .mobile-menu-panel.open {
            display: block;
        }

        @media (min-width: 1024px) {
            .section-padding {
                padding-top: 96px;
                padding-bottom: 96px;
            }
        }

        @media (max-width: 767px) {
            .desktop-nav-center {
                display: none;
            }
            .desktop-nav-right {
                display: none;
            }
            .nav-search-input {
                width: 100%;
            }
        }

        @media (min-width: 768px) {
            .mobile-toggle-btn {
                display: none;
            }
        }