:root {
            --bg-deep: #06090f;
            --bg-primary: #0b1019;
            --bg-secondary: #111827;
            --bg-card: rgba(22, 27, 40, 0.85);
            --bg-card-hover: rgba(30, 37, 54, 0.92);
            --bg-glass: rgba(255, 255, 255, 0.025);
            --text-primary: #e6edf3;
            --text-secondary: #8b9bb5;
            --text-muted: #5c6d82;
            --accent-sky: #38bdf8;
            --accent-violet: #818cf8;
            --accent-teal: #2dd4bf;
            --accent-amber: #f59e0b;
            --accent-rose: #f472b6;
            --gradient-accent: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #a78bfa 100%);
            --gradient-glow: radial-gradient(ellipse at 50% 0%, rgba(56, 189, 248, 0.12) 0%, transparent 70%);
            --border-subtle: rgba(255, 255, 255, 0.06);
            --border-medium: rgba(255, 255, 255, 0.10);
            --border-glow: rgba(56, 189, 248, 0.25);
            --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 16px rgba(0, 0, 0, 0.3);
            --shadow-card-hover: 0 2px 4px rgba(0, 0, 0, 0.5), 0 8px 32px rgba(56, 189, 248, 0.08);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --font-mono: 'SF Mono', 'Cascadia Code', 'JetBrains Mono', 'Consolas', monospace;
            --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1280px;
        }

        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.65;
            background-image:
                radial-gradient(ellipse at 20% 10%, rgba(56,189,248,0.04) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 90%, rgba(129,140,248,0.03) 0%, transparent 60%);
            background-attachment: fixed;
        }

        header {
            position: sticky; top: 0; z-index: 100;
            background: rgba(11,16,25,0.82); backdrop-filter: blur(18px) saturate(140%);
            -webkit-backdrop-filter: blur(18px) saturate(140%);
            border-bottom: 1px solid var(--border-subtle);
        }
        .header-box {
            max-width: var(--max-width); margin: 0 auto;
            display: flex; align-items: center; justify-content: space-between;
            padding: 0 24px; height: 58px; gap: 20px;
        }
        .brand-logo {
            display: flex; align-items: center; gap: 10px; text-decoration: none;
            color: var(--text-primary); font-weight: 700; font-size: 1.08rem; white-space: nowrap;
        }
        .brand-logo img { width: 34px; height: 34px; border-radius: 8px; }
        .brand-dot {
            width: 7px; height: 7px; border-radius: 50%; background: var(--accent-sky);
            box-shadow: 0 0 10px var(--accent-sky); animation: dotPulse 2.2s infinite; margin-left: 2px;
        }
        @keyframes dotPulse {
            0%,100% { box-shadow: 0 0 6px var(--accent-sky); }
            50% { box-shadow: 0 0 18px var(--accent-sky), 0 0 32px rgba(56,189,248,0.4); }
        }
        nav { display: flex; gap: 4px; flex-wrap: wrap; justify-content: flex-end; }
        nav a {
            padding: 7px 14px; border-radius: 20px; text-decoration: none;
            color: var(--text-secondary); font-size: 0.9rem; font-weight: 500; transition: var(--transition-fast);
        }
        nav a:hover { color: var(--text-primary); background: var(--bg-glass); }
        nav a.current-tab { color: #fff; background: rgba(56,189,248,0.12); font-weight: 600; }
        .nav-accent {
            background: var(--gradient-accent); color: #fff !important; font-weight: 600;
            padding: 7px 16px !important; box-shadow: 0 2px 12px rgba(56,189,248,0.25);
        }

        main { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
        .section-inner { padding: 48px 0; }
        .section-inner h2 {
            font-size: 1.7rem; font-weight: 700; text-align: center; margin-bottom: 8px; color: var(--text-primary);
            scroll-margin-top: 80px;
        }
        .section-lead { text-align: center; color: var(--text-secondary); max-width: 640px; margin: 0 auto 36px; font-size: 0.95rem; }
        .section-divider { border: none; border-top: 1px solid var(--border-subtle); margin: 10px 0; }

        .compare-hero {
            padding: 50px 0 30px; text-align: center; position: relative; overflow: hidden;
        }
        .compare-hero::before {
            content: ''; position: absolute; top: -100px; left: 50%; transform: translateX(-50%);
            width: 600px; height: 600px; background: var(--gradient-glow); border-radius: 50%; pointer-events: none;
        }
        .hero-wrapper { position: relative; z-index: 1; }
        .hero-wrapper h1 {
            font-size: clamp(2rem, 4.5vw, 2.7rem); font-weight: 800; letter-spacing: -0.02em;
            background: var(--gradient-accent); -webkit-background-clip: text; background-clip: text;
            -webkit-text-fill-color: transparent; margin-bottom: 12px;
        }
        .hero-desc { max-width: 680px; margin: 0 auto; color: var(--text-secondary); font-size: 1.02rem; line-height: 1.7; }

        /* 对比卡片 */
        .compare-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px; }
        .compare-card {
            background: var(--bg-card); border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg); padding: 22px; transition: var(--transition-smooth);
        }
        .compare-card:hover { border-color: var(--border-glow); box-shadow: var(--shadow-card-hover); }
        .compare-card h3 {
            font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; color: var(--accent-sky);
            display: flex; align-items: center; gap: 8px;
        }
        .compare-card h3 .vs { color: var(--accent-amber); }
        .compare-card p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 10px; }

        .score-bar { display: flex; align-items: center; gap: 10px; margin: 8px 0; }
        .score-bar span { font-size: 0.82rem; color: var(--text-muted); width: 50px; }
        .score-fill {
            flex: 1; height: 6px; background: rgba(255,255,255,0.08); border-radius: 3px; overflow: hidden;
        }
        .score-fill div { height: 100%; border-radius: 3px; background: var(--gradient-accent); }

        .pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 12px; }
        .pros-cons div { font-size: 0.82rem; color: var(--text-secondary); }
        .pros-cons .label { font-weight: 700; font-size: 0.78rem; margin-bottom: 4px; display: block; }
        .pros-cons .pro { color: var(--accent-teal); }
        .pros-cons .con { color: var(--accent-rose); }

        /* 选型指南 */
        .guide-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
        .guide-card {
            background: var(--bg-glass); border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md); padding: 18px; text-align: center;
        }
        .guide-card h4 { font-weight: 700; margin-bottom: 6px; color: var(--accent-violet); }
        .guide-card p { font-size: 0.84rem; color: var(--text-secondary); }

        footer {
            border-top: 1px solid var(--border-subtle); background: var(--bg-secondary); margin-top: 40px;
        }
        .footer-wrapper { max-width: var(--max-width); margin: 0 auto; padding: 36px 24px 20px; }
        .footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 24px; margin-bottom: 24px; }
        .footer-section h5 { font-size: 0.85rem; font-weight: 700; color: var(--text-muted); margin-bottom: 10px; }
        .footer-section ul { list-style: none; }
        .footer-section li { margin-bottom: 6px; }
        .footer-section a { color: var(--text-secondary); text-decoration: none; font-size: 0.84rem; }
        .footer-section a:hover { color: var(--accent-sky); }
        .footer-legal { border-top: 1px solid var(--border-subtle); padding-top: 16px; font-size: 0.76rem; color: var(--text-muted); text-align: center; }

        @media (max-width: 768px) {
            .header-box { flex-wrap: wrap; height: auto; padding: 10px 16px; justify-content: center; }
            .pros-cons { grid-template-columns: 1fr; }
            .compare-grid { grid-template-columns: 1fr; }
        }