/* roulang page: index */
:root {
            --primary: #4F46E5;
            --primary-gradient: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
            --bg-page: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-light: #E2E8F0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-page);
            color: var(--text-main);
            overflow-x: hidden;
            scroll-behavior: smooth;
        }
        .text-gradient {
            background: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .btn-gradient {
            background: linear-gradient(135deg, #4F46E5 0%, #0891b2 100%);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .btn-gradient:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px -5px rgba(79, 70, 229, 0.4);
        }
        .card-shadow {
            box-shadow: 0 10px 25px -5px rgba(79, 70, 229, 0.06), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-shadow:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 30px -10px rgba(79, 70, 229, 0.12), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        }