/* roulang page: index */
:root {
            --primary: #0F383A;
            --primary-accent: #0D9488;
            --highlight: #F59E0B;
            --bg-light: #F8F9FB;
            --bg-dark: #0D1117;
            --text-dark: #0F172A;
            --text-muted: #334155;
            --text-sub: #64748B;
        }
        body {
            font-family: var(--font-sans);
            background-color: #FFFFFF;
            color: var(--text-muted);
            line-height: 1.8;
            overflow-x: hidden;
        }
        .hero-bg {
            background-image: linear-gradient(to bottom, rgba(15, 56, 58, 0.94), rgba(13, 17, 23, 0.96)), url('/assets/images/6ada7d9c45c30940.webp');
            background-size: cover;
            background-position: center;
        }
        .flow-bg {
            background-image: linear-gradient(to right, rgba(13, 17, 23, 0.96), rgba(15, 56, 58, 0.92)), url('/assets/images/8f5c6cc502af97bb.jpg');
            background-size: cover;
            background-position: center;
        }
        .stat-glow {
            text-shadow: 0 0 20px rgba(13, 148, 136, 0.35);
        }
        .tab-btn.active {
            border-bottom: 2px solid #0D9488;
            color: #0D9488;
            font-weight: 600;
        }