/* roulang page: index */
:root {
            --primary-glow: rgba(6, 182, 212, 0.45);
            --neon-blue: #06b6d4;
            --neon-indigo: #6366f1;
            --bg-deep: #030712;
            --surface-glass: rgba(15, 23, 42, 0.65);
            --border-glass: rgba(51, 65, 85, 0.45);
        }
        body {
            background-color: var(--bg-deep);
            color: #f1f5f9;
            font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            overflow-x: hidden;
        }
        .circuit-bg {
            background-image: radial-gradient(rgba(14, 165, 233, 0.08) 1px, transparent 1px);
            background-size: 28px 28px;
        }
        .glass-card {
            background: var(--surface-glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glass);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .glass-card:hover {
            border-color: rgba(34, 211, 238, 0.5);
            box-shadow: 0 10px 30px -10px rgba(6, 182, 212, 0.25);
        }
        .glow-btn {
            box-shadow: 0 0 22px -3px var(--primary-glow);
            transition: all 0.3s ease;
        }
        .glow-btn:hover {
            box-shadow: 0 0 32px 0px rgba(6, 182, 212, 0.7);
            transform: scale(1.02);
        }
        .text-gradient {
            background: linear-gradient(135deg, #ffffff 30%, #38bdf8 80%, #818cf8 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .border-glow-t {
            border-top: 1px solid transparent;
            border-image: linear-gradient(90deg, transparent, rgba(6, 182, 212, 0.6), transparent) 1;
        }
        html {
            scroll-behavior: smooth;
        }