/* roulang page: index */
:root {
            --primary: #0F172A;
            --primary-light: #1E293B;
            --accent: #06B6D4;
            --accent-green: #10B981;
            --text-dark: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --bg-light: #F8FAFC;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Source Han Sans CN", sans-serif;
            color: var(--text-body);
            background-color: var(--bg-light);
            overflow-x: hidden;
        }
        .text-gradient {
            background: linear-gradient(135deg, #06B6D4 0%, #3B82F6 50%, #10B981 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-mesh {
            background-color: #0F172A;
            background-image: radial-gradient(at 0% 0%, rgba(6, 182, 212, 0.2) 0, transparent 50%), radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.15) 0, transparent 50%);
        }
        .border-glow {
            border: 1px solid rgba(6, 182, 212, 0.3);
            box-shadow: 0 0 25px -5px rgba(6, 182, 212, 0.25);
        }
        .faq-collapse {
            transition: max-height 0.3s ease, opacity 0.3s ease;
        }