/* roulang page: index */
:root {
            --primary: #0F242A;
            --emerald: #10B981;
            --cyan: #06B6D4;
            --dark-bg: #0B1315;
            --font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }
        body {
            font-family: var(--font-family);
            color: #334155;
            background-color: #ffffff;
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
        }
        .text-gradient {
            background: linear-gradient(135deg, #10B981 0%, #06B6D4 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-bg-overlay {
            background: linear-gradient(180deg, rgba(15, 36, 42, 0.88) 0%, rgba(11, 19, 21, 0.96) 100%);
        }
        .glass-card {
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .accordion-content {
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
        }