/* roulang page: index */
:root {
            --brand-primary: #059669;
            --brand-speed: #00D084;
            --bg-dark: #0B1329;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-light: #E2E8F0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-body);
            background-color: #F8FAFC;
        }
        .text-heading { color: var(--text-heading); }
        .hero-bg {
            background-image: linear-gradient(135deg, rgba(11, 19, 41, 0.94) 0%, rgba(15, 23, 42, 0.88) 100%), url('/assets/images/ee44d839b65bbcce.jpg');
            background-size: cover;
            background-position: center;
        }
        .cta-bg {
            background-image: linear-gradient(120deg, rgba(11, 19, 41, 0.95) 0%, rgba(5, 150, 105, 0.85) 100%), url('/assets/images/17dd39e0381ebdf6.jpg');
            background-size: cover;
            background-position: center;
        }
        .card-hover {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 30px -10px rgba(0, 0, 0, 0.1);
        }
        details summary::-webkit-details-marker {
            display: none;
        }