/* roulang page: index */
:root {
            --primary: #10b981;
            --primary-dark: #059669;
            --accent: #f97316;
            --text-main: #0f172a;
            --text-muted: #475569;
            --bg-light: #f8fafc;
            --bg-card: #ffffff;
            --border-light: #e2e8f0;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #ffffff;
            line-height: 1.75;
            scroll-behavior: smooth;
        }
        .section-py {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }
        .hero-overlay {
            background: linear-gradient(180deg, rgba(15, 23, 42, 0.75) 0%, rgba(15, 23, 42, 0.9) 100%);
        }
        .flash-badge {
            animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
        }
        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: .6; }
        }