/* roulang page: index */
:root {
            --color-bg-base: #0B0F19;
            --color-bg-surface: #111827;
            --color-bg-card: rgba(17, 24, 39, 0.72);
            --color-cyan: #00F2FE;
            --color-blue: #4FACFE;
            --color-green: #10B981;
            --color-amber: #F59E0B;
            --border-glass: rgba(255, 255, 255, 0.08);
        }
        body {
            background-color: var(--color-bg-base);
            color: #E2E8F0;
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
        }
        .glass-panel {
            background: var(--color-bg-card);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glass);
        }
        .glass-panel-hover {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .glass-panel-hover:hover {
            border-color: rgba(0, 242, 254, 0.3);
            transform: translateY(-3px);
            box-shadow: 0 12px 30px -10px rgba(0, 242, 254, 0.15);
        }
        .btn-glow-cyan {
            background: linear-gradient(135deg, #00F2FE 0%, #4FACFE 100%);
            box-shadow: 0 0 22px rgba(0, 242, 254, 0.35);
            transition: all 0.25s ease;
        }
        .btn-glow-cyan:hover {
            box-shadow: 0 0 30px rgba(0, 242, 254, 0.55);
            transform: translateY(-2px);
        }
        .text-gradient {
            background: linear-gradient(135deg, #00F2FE 0%, #4FACFE 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .border-glow {
            border: 1px solid rgba(0, 242, 254, 0.4);
            box-shadow: 0 0 15px rgba(0, 242, 254, 0.2);
        }
        .timeline-line::before {
            content: '';
            position: absolute;
            top: 0;
            bottom: 0;
            left: 20px;
            width: 2px;
            background: linear-gradient(to bottom, rgba(0,242,254,0.6), rgba(79,172,254,0.1));
        }
        @media (min-width: 768px) {
            .timeline-line::before {
                left: 50%;
                transform: translateX(-50%);
            }
        }