/* roulang page: index */
:root {
            --primary: #1d4ed8;
            --primary-hover: #1e40af;
            --bg-base: #f8fafc;
            --text-heading: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --border-light: #e2e8f0;
            --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
            --card-hover-shadow: 0 20px 25px -5px rgba(29, 78, 216, 0.08), 0 8px 10px -6px rgba(29, 78, 216, 0.04);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: var(--bg-base);
            color: var(--text-body);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.65;
            overflow-x: hidden;
        }
        .custom-card {
            background: #ffffff;
            border: 1px solid var(--border-light);
            border-radius: 1rem;
            box-shadow: var(--card-shadow);
            transition: all 0.25s ease-in-out;
        }
        .custom-card:hover {
            box-shadow: var(--card-hover-shadow);
            transform: translateY(-3px);
            border-color: #cbd5e1;
        }
        .accent-gradient {
            background: linear-gradient(135deg, #1e40af 0%, #1d4ed8 50%, #0284c7 100%);
        }
        .accent-card-highlight {
            border: 2px solid #2563eb;
            box-shadow: 0 10px 30px -5px rgba(37, 99, 235, 0.2);
        }