/* roulang page: index */
:root {
            --primary: #1E293B;
            --accent: #0EA5E9;
            --accent-emerald: #10B981;
            --bg-light: #F8FAFC;
            --text-main: #334155;
            --text-heading: #0F172A;
            --border-color: #E2E8F0;
        }
        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }
        body {
            color: var(--text-main);
            background-color: #FFFFFF;
            overflow-x: hidden;
        }
        .container-custom {
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        .hero-bg-overlay {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(30, 41, 59, 0.88) 100%);
        }
        .card-custom {
            border: 1px solid var(--border-color);
            box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.04);
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 30px -10px rgba(15, 23, 42, 0.1);
            border-color: #CBD5E1;
        }
        details summary::-webkit-details-marker {
            display: none;
        }