/* roulang page: index */
:root {
            --primary: #1E40AF;
            --primary-hover: #1D4ED8;
            --accent: #F97316;
            --bg-light: #F8FAFC;
            --text-dark: #0F172A;
            --text-muted: #64748B;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            color: var(--text-dark);
            background-color: #FFFFFF;
        }
        .hero-banner {
            background-image: linear-gradient(to right, rgba(15, 23, 42, 0.92), rgba(30, 64, 175, 0.85)), url('/assets/images/8b76fd1a16cab979.png');
            background-size: cover;
            background-position: center;
        }
        .deep-engine-bg {
            background-image: linear-gradient(rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.98)), url('/assets/images/301083751e005081.jpg');
            background-size: cover;
            background-position: center;
        }
        .accordion-content {
            transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .accordion-content.active {
            max-height: 240px;
            opacity: 1;
        }