/* roulang page: index */
:root {
            --bg-main: #0B0E14;
            --bg-surface: #121722;
            --bg-card: #182030;
            --primary: #6366F1;
            --secondary: #06B6D4;
            --accent: #F59E0B;
            --text-main: #F8FAFC;
            --text-muted: #94A3B8;
            --border-dim: #1E293B;
        }
        body {
            background-color: var(--bg-main);
            color: var(--text-main);
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            overflow-x: hidden;
        }
        .hero-slant {
            clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
        }
        .glow-border {
            border: 1px solid rgba(99, 102, 241, 0.2);
            transition: all 0.3s ease;
        }
        .glow-border:hover {
            border-color: rgba(6, 182, 212, 0.5);
            box-shadow: 0 0 25px rgba(99, 102, 241, 0.15);
        }
        .tech-gradient-text {
            background: linear-gradient(135deg, #FFFFFF 20%, #A5B4FC 60%, #38BDF8 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .btn-gradient {
            background: linear-gradient(135deg, #6366F1 0%, #06B6D4 100%);
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .btn-gradient:hover {
            opacity: 0.95;
            transform: translateY(-2px);
            box-shadow: 0 10px 25px -5px rgba(99, 102, 241, 0.4);
        }
        details summary::-webkit-details-marker {
            display:none;
        }