/* roulang page: index */
:root {
            --primary: #0F2027;
            --accent: #00B4D8;
            --accent-hover: #0077B6;
            --danger: #FF5A5F;
            --surface: #F8F9FA;
            --text-main: #0A1118;
            --text-body: #2B3A4A;
            --text-muted: #64748B;
        }
        html { scroll-behavior: smooth; }
        body { font-family: var(--font-sans); color: var(--text-body); background-color: #ffffff; }
        .hero-overlay { background: linear-gradient(135deg, rgba(15, 32, 39, 0.95) 0%, rgba(11, 19, 30, 0.88) 100%); }
        .metric-badge { border: 1px solid rgba(0, 180, 216, 0.3); background: rgba(0, 180, 216, 0.08); }
        .card-custom { transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
        .card-custom:hover { transform: translateY(-4px); box-shadow: 0 12px 24px -10px rgba(15, 32, 39, 0.15); }
        details summary::-webkit-details-marker { display: none; }
        details[open] summary svg { transform: rotate(180deg); }