/* roulang page: index */
:root {
            --lab-primary: #0F4C5C;
            --lab-cyan: #00B4D8;
            --lab-green: #10B981;
            --lab-bg: #F8FAFC;
            --lab-dark: #0B192C;
            --lab-text: #0F172A;
            --lab-muted: #64748B;
            --lab-border: #E2E8F0;
        }
        html {
            scroll-behavior: smooth;
        }
        section {
            scroll-margin-top: 88px;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: #334155;
            background-color: var(--lab-bg);
            line-height: 1.68;
        }
        .hero-bg {
            background-image: linear-gradient(rgba(11, 25, 44, 0.88), rgba(15, 76, 92, 0.92)), url('/assets/images/cbe4a28387689979.webp');
            background-size: cover;
            background-position: center;
        }
        .deep-bg {
            background-image: linear-gradient(rgba(11, 25, 44, 0.96), rgba(11, 25, 44, 0.96)), url('/assets/images/07d2288a92d5da95.webp');
            background-size: cover;
            background-position: center;
        }
        .custom-card-shadow {
            box-shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
            transition: all 0.25s ease;
        }
        .custom-card-shadow:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 20px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -4px rgba(15, 23, 42, 0.05);
        }
        .tab-btn.active {
            color: #0F4C5C;
            border-bottom: 2px solid #0F4C5C;
            font-weight: 600;
        }