/* roulang page: index */
:root {
            --brand-primary: #0052D9;
            --brand-hover: #003cab;
            --accent-green: #00A870;
            --accent-blue: #007AFF;
            --text-main: #0F172A;
            --text-muted: #475569;
            --bg-page: #F8FAFC;
            --bg-card: #FFFFFF;
            --bg-dark: #0A0F1D;
            --border-color: #E2E8F0;
        }
        html { scroll-behavior: smooth; scroll-padding-top: 80px; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background-color: var(--bg-page); color: var(--text-main); }
        .hero-banner { background: linear-gradient(135deg, rgba(10, 15, 29, 0.88), rgba(0, 82, 217, 0.75)), url('/assets/images/63b877941a57c373.jpg') center/cover no-repeat; }
        .card-custom { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 1rem; box-shadow: 0 4px 20px -2px rgba(0, 82, 217, 0.05); transition: all 0.3s ease; }
        .card-custom:hover { transform: translateY(-4px); box-shadow: 0 12px 30px -4px rgba(0, 82, 217, 0.12); border-color: #bfdbfe; }
        .btn-primary { background-color: var(--brand-primary); transition: all 0.2s ease; }
        .btn-primary:hover { background-color: var(--brand-hover); }
        .badge-tag { background: #eff6ff; color: var(--brand-primary); border: 1px solid #dbeafe; }
        .faq-item[open] summary .faq-icon { transform: rotate(180deg); }