/* roulang page: index */
:root {
            --primary: #1A56DB;
            --primary-hover: #1546b0;
            --accent-green: #0E9F6E;
            --accent-purple: #7E3AF2;
            --bg-light: #F9FAFB;
            --text-main: #111928;
            --text-muted: #4B5563;
            --card-border: #E5E7EB;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            -webkit-tap-highlight-color: transparent;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--text-main);
            background-color: var(--bg-light);
            line-height: 1.6;
        }
        html {
            scroll-behavior: smooth;
        }
        .custom-card {
            background-color: #ffffff;
            border: 1px solid #F1F5F9;
            box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .custom-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 32px -4px rgba(26, 86, 219, 0.12);
            border-color: #BFDBFE;
        }
        .hero-bg {
            background: linear-gradient(rgba(15, 23, 42, 0.78), rgba(15, 23, 42, 0.90)), url('/assets/images/a8d858c7a123d373.png') center/cover no-repeat;
        }
        .dark-section {
            background-color: #0F172A;
            color: #F8FAFC;
        }
        details summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary svg {
            transform: rotate(180deg);
        }