/* roulang page: index */
:root {
            --color-primary: #1a56db;
            --color-primary-hover: #1e40af;
            --color-text-main: #0f172a;
            --color-text-muted: #64748b;
            --color-bg-light: #f8fafc;
            --color-border: #e2e8f0;
            --radius-card: 14px;
            --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
            --shadow-hover: 0 20px 25px -5px rgba(26, 86, 219, 0.12), 0 8px 10px -6px rgba(26, 86, 219, 0.08);
        }
        html { scroll-behavior: smooth; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; color: var(--color-text-main); background-color: #ffffff; }
        .hero-pattern {
            background-color: #0b1329;
            background-image: radial-gradient(rgba(26, 86, 219, 0.25) 1px, transparent 0);
            background-size: 24px 24px;
        }
        .card-interaction {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            border: 1px solid var(--color-border);
        }
        .card-interaction:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(26, 86, 219, 0.3);
        }
        .text-gradient {
            background: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }