/* roulang page: index */
:root {
            --bg-base: #080C14;
            --bg-surface: #0F172A;
            --text-primary: #F8FAFC;
            --text-secondary: #94A3B8;
            --text-muted: #64748B;
            --accent-blue: #2563EB;
            --accent-cyan: #00D8FF;
            --accent-emerald: #10B981;
            --accent-amber: #F59E0B;
            --border-glass: rgba(255, 255, 255, 0.08);
            --card-glass: rgba(15, 23, 42, 0.72);
        }

        body {
            background-color: var(--bg-base);
            color: var(--text-primary);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            overflow-x: hidden;
        }

        .glass-card {
            background: var(--card-glass);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-glass);
            box-shadow: 0 12px 36px -8px rgba(0, 0, 0, 0.6);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .glass-card:hover {
            border-color: rgba(0, 216, 255, 0.35);
            box-shadow: 0 16px 42px -6px rgba(0, 216, 255, 0.15);
            transform: translateY(-4px);
        }

        .glow-cyan-btn {
            background: linear-gradient(135deg, #2563EB 0%, #00D8FF 100%);
            box-shadow: 0 0 24px rgba(0, 216, 255, 0.4);
            transition: all 0.25s ease;
        }

        .glow-cyan-btn:hover {
            box-shadow: 0 0 32px rgba(0, 216, 255, 0.65);
            transform: translateY(-2px);
            filter: brightness(1.1);
        }

        .glow-outline-btn {
            border: 1px solid rgba(0, 216, 255, 0.5);
            background: rgba(37, 99, 235, 0.1);
            transition: all 0.25s ease;
        }

        .glow-outline-btn:hover {
            border-color: #00D8FF;
            background: rgba(0, 216, 255, 0.2);
            box-shadow: 0 0 20px rgba(0, 216, 255, 0.3);
        }

        .grid-tech-bg {
            background-image: radial-gradient(rgba(0, 216, 255, 0.12) 1px, transparent 1px),
                              linear-gradient(to bottom, #080C14, #0B1120);
            background-size: 32px 32px, 100% 100%;
        }

        .hud-line {
            background: linear-gradient(90deg, transparent, rgba(0, 216, 255, 0.6), transparent);
        }