/* roulang page: index */
:root {
            --color-bg-dark: #0B0F19;
            --color-bg-deep: #070A10;
            --color-bg-light: #F8FAFC;
            --color-primary: #1D4ED8;
            --color-cyan: #06B6D4;
            --color-text-main: #0F172A;
            --color-text-muted: #64748B;
            --color-border: #E2E8F0;
            --radius-default: 8px;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: #F8FAFC;
            color: #334155;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }
        :focus-visible {
            outline: 2px solid var(--color-cyan);
            outline-offset: 2px;
        }
        .header-glass {
            background-color: rgba(11, 15, 25, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .hero-banner {
            background-image: linear-gradient(rgba(11, 15, 25, 0.88), rgba(7, 10, 16, 0.95)), url('/assets/images/451252b238ce570e.webp');
            background-size: cover;
            background-position: center;
        }
        .dark-strip-bg {
            background-image: linear-gradient(rgba(7, 10, 16, 0.94), rgba(7, 10, 16, 0.98)), url('/assets/images/8cd5295b689ce5e7.webp');
            background-size: cover;
            background-position: center;
        }
        .card-subtle {
            transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
        }
        .card-subtle:hover {
            transform: translateY(-3px);
            border-color: rgba(6, 182, 212, 0.4);
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.02);
        }
        .dark-card-hover:hover {
            transform: translateY(-3px);
            border-color: rgba(6, 182, 212, 0.6);
            box-shadow: 0 12px 30px -5px rgba(6, 182, 212, 0.15);
        }
        .timeline-line {
            position: absolute;
            left: 20px;
            top: 24px;
            bottom: 24px;
            width: 2px;
            background: #E2E8F0;
        }
        @media (min-width: 768px) {
            .timeline-line-h {
                position: absolute;
                top: 24px;
                left: 10%;
                right: 10%;
                height: 2px;
                background: #E2E8F0;
            }
        }