:root {
            --bg: #f5f4f1;
            --surface: #ffffff;
            --surface-2: #f9f8f6;
            --border: rgba(0,0,0,0.07);
            --border-strong: rgba(0,0,0,0.12);
            --text-1: #1a1917;
            --text-2: #6b6a67;
            --text-3: #a09f9c;
            --accent: #1a1917;
            --accent-fg: #ffffff;
            --blue-bg: #dbe9f9;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
            --font: 'DM Sans', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            --mono: 'DM Mono', 'Courier New', monospace;
            --transition: 0.18s ease;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text-1);
            min-height: 100vh;
            padding: 32px 18px 64px;
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
        }
        .wrap { max-width: 920px; margin: 0 auto; }
        .site-header {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 28px;
        }
        .logo-mark {
            width: 42px;
            height: 42px;
            background: var(--text-1);
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            flex-shrink: 0;
        }
        .site-header h1 {
            font-size: 20px;
            font-weight: 500;
            letter-spacing: -0.3px;
            margin-bottom: 1px;
        }
        .site-header p {
            font-size: 13px;
            color: var(--text-2);
        }
        .hero {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-xl);
            padding: 22px 24px;
            margin-bottom: 12px;
            box-shadow: var(--shadow);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 12px;
            border-radius: 999px;
            background: var(--blue-bg);
            color: var(--text-1);
            font-size: 12px;
            margin-bottom: 16px;
            font-weight: 500;
        }
        h1 { font-size: 28px; line-height: 1.2; margin-bottom: 10px; font-weight: 500; }
        .hero > p { color: var(--text-2); font-size: 14px; line-height: 1.8; max-width: 700px; }
        .grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 18px; }
        .card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-xl);
            padding: 22px 24px;
            box-shadow: var(--shadow);
            display: flex;
            flex-direction: column;
            min-height: 250px;
        }
        .icon {
            width: 42px;
            height: 42px;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--text-1);
            color: #fff;
            font-size: 16px;
            margin-bottom: 16px;
        }
        .card h2 { font-size: 18px; font-weight: 500; margin-bottom: 8px; }
        .card p { color: var(--text-2); line-height: 1.75; margin-bottom: 14px; font-size: 14px; }
        .list { list-style: none; margin-bottom: 20px; }
        .list li {
            color: var(--text-1);
            margin-bottom: 10px;
            display: flex;
            gap: 10px;
            align-items: flex-start;
            font-size: 13px;
        }
        .list li i { color: var(--text-2); margin-top: 2px; }
        .actions { margin-top: auto; display: flex; gap: 12px; flex-wrap: wrap; }
        .btn {
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            height: 36px;
            padding: 0 16px;
            border-radius: 10px;
            font-size: 13px;
            font-weight: 500;
            transition: transform var(--transition), opacity var(--transition);
        }
        .btn:hover { transform: translateY(-2px); }
        .btn-primary { background: var(--accent); color: var(--accent-fg); }
        .footer {
            margin-top: 12px;
            border: 1px solid var(--border);
            background: var(--surface);
            border-radius: var(--radius-xl);
            padding: 20px 24px;
            color: var(--text-2);
            line-height: 1.75;
            box-shadow: var(--shadow);
            font-size: 14px;
        }
        @media (max-width: 860px) {
            h1 { font-size: 24px; }
            .grid { grid-template-columns: 1fr; }
        }