/* roulang page: index */
:root {
            --primary: #1E40AF;
            --accent: #0284C7;
            --bg-light: #F8FAFC;
            --text-main: #1E293B;
            --text-muted: #64748B;
        }
        body {
            color: var(--text-main);
            background-color: #FFFFFF;
            overflow-x: hidden;
        }
        .hero-bg-overlay {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 64, 175, 0.75) 100%), url('/assets/images/84a99613dafd408f.png') center/cover no-repeat;
        }
        .quiz-card {
            backdrop-filter: blur(16px);
            background: rgba(255, 255, 255, 0.95);
        }
        .step-line::before {
            content: '';
            position: absolute;
            top: 24px;
            left: 0;
            width: 100%;
            height: 2px;
            background: #E2E8F0;
            z-index: 0;
        }
        @media (max-width: 768px) {
            .step-line::before {
                display: none;
            }
        }
        details > summary::-webkit-details-marker {
            display: none;
        }