/* roulang page: index */
:root {
            --primary: #0f4c81;
            --accent: #00a8cc;
            --bg-light: #f8fafc;
            --text-dark: #0f172a;
            --text-muted: #475569;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--text-dark);
            background-color: #ffffff;
        }
        .hero-bg {
            background-image: linear-gradient(rgba(10, 25, 47, 0.75), rgba(15, 76, 129, 0.85)), url('/assets/images/75f639f88a7932ca.webp');
            background-size: cover;
            background-position: center;
        }
        .tech-bg {
            background-image: linear-gradient(rgba(10, 25, 47, 0.92), rgba(10, 25, 47, 0.95)), url('/assets/images/6b9660d4d38289bc.jpg');
            background-size: cover;
            background-position: center;
        }
        details summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary .faq-icon {
            transform: rotate(180deg);
        }
        details[open] {
            border-left: 4px solid var(--accent);
        }