/* roulang page: index */
:root {
            --primary: #00F2FE;
            --primary-dark: #4FACFE;
            --bg-dark: #0D1117;
            --surface-dark: #161B22;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-light: rgba(226, 232, 240, 0.8);
        }
        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: #F8FAFC;
            color: #0F172A;
            line-height: 1.7;
            overflow-x: hidden;
        }
        .brand-gradient-text {
            background: linear-gradient(135deg, #00F2FE 0%, #4FACFE 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .brand-gradient-bg {
            background: linear-gradient(135deg, #00F2FE 0%, #4FACFE 100%);
        }
        .glow-border {
            border: 1px solid rgba(0, 242, 254, 0.3);
            box-shadow: 0 0 25px rgba(79, 172, 254, 0.15);
        }
        details summary::-webkit-details-marker {
            display: none;
        }
        .timeline-line::before {
            content: '';
            position: absolute;
            top: 0;
            bottom: 0;
            left: 50%;
            width: 2px;
            background: #E2E8F0;
            transform: translateX(-50%);
        }
        @media (max-width: 768px) {
            .timeline-line::before {
                left: 1.5rem;
            }
        }