/* roulang page: index */
:root {
            --primary: #1E40AF;
            --primary-light: #3B82F6;
            --accent: #0284C7;
            --surface: #FFFFFF;
            --bg-muted: #F8FAFC;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
            --radius-box: 1rem;
            --shadow-subtle: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
            --shadow-lift: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Heiti SC", sans-serif;
            background-color: var(--bg-muted);
            color: var(--text-body);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
        }
        .card-lift {
            transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .card-lift:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lift);
        }
        .phone-mockup-frame {
            border: 8px solid #0F172A;
            border-radius: 36px;
            box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.25);
        }
        .badge-pulse {
            animation: pulse-ring 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
        }
        @keyframes pulse-ring {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.5; }
        }