/* roulang page: index */
:root {
            --bg-deep: #060B18;
            --bg-card: rgba(16, 29, 56, 0.65);
            --brand-blue: #1E60FF;
            --electric-cyan: #00D2FF;
            --amber-gold: #E5A93C;
            --text-main: #E2E8F0;
            --text-muted: #94A3B8;
            --border-glow: rgba(0, 210, 255, 0.2);
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        body {
            background-color: var(--bg-deep);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
            line-height: 1.6;
        }

        .glass-panel {
            background: var(--bg-card);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glow);
            transition: var(--transition-smooth);
        }

        .glass-panel:hover {
            border-color: rgba(0, 210, 255, 0.45);
            box-shadow: 0 0 25px rgba(0, 210, 255, 0.15);
        }

        .btn-glow {
            background: linear-gradient(135deg, #1E60FF 0%, #00D2FF 100%);
            box-shadow: 0 0 20px rgba(30, 96, 255, 0.4);
            transition: var(--transition-smooth);
        }

        .btn-glow:hover {
            box-shadow: 0 0 30px rgba(0, 210, 255, 0.7);
            transform: translateY(-2px);
        }

        .btn-secondary {
            border: 1px solid rgba(0, 210, 255, 0.3);
            background: rgba(16, 29, 56, 0.8);
            transition: var(--transition-smooth);
        }

        .btn-secondary:hover {
            border-color: var(--electric-cyan);
            color: #fff;
            box-shadow: 0 0 15px rgba(0, 210, 255, 0.25);
        }

        .section-glow-title::before {
            content: '';
            display: inline-block;
            width: 4px;
            height: 1.25em;
            background: linear-gradient(to bottom, #00D2FF, #1E60FF);
            margin-right: 0.75rem;
            vertical-align: -0.15em;
            border-radius: 2px;
            box-shadow: 0 0 8px #00D2FF;
        }

        .bg-grid-tech {
            background-size: 36px 36px;
            background-image: 
                linear-gradient(to right, rgba(0, 210, 255, 0.05) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(0, 210, 255, 0.05) 1px, transparent 1px);
        }

        .hero-stacked-left {
            transform: rotate(-3deg) translateY(18px) scale(0.95);
        }
        .hero-stacked-right {
            transform: rotate(3deg) translateY(18px) scale(0.95);
        }
        .hero-stacked-center {
            z-index: 20;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5), 0 0 30px rgba(0, 210, 255, 0.2);
        }

        @media (max-width: 1024px) {
            .hero-stacked-left, .hero-stacked-right {
                transform: none;
            }
        }