/* roulang page: index */
:root {
            --primary: #0284C7;
            --primary-dark: #0369A1;
            --secondary: #10B981;
            --bg-page: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-soft: #E2E8F0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-page);
            color: var(--text-main);
            overflow-x: hidden;
            scroll-behavior: smooth;
        }
        .hero-bg-overlay {
            background: linear-gradient(180deg, rgba(15, 23, 42, 0.82) 0%, rgba(15, 23, 42, 0.94) 100%);
        }
        .card-custom {
            transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 28px -6px rgba(2, 132, 199, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
        }