/* roulang page: index */
:root {
            --brand-primary: #1d4ed8;
            --brand-primary-hover: #1e40af;
            --brand-accent: #f97316;
            --bg-canvas: #f8fafc;
            --text-dark: #0f172a;
            --text-muted: #64748b;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-canvas);
            color: var(--text-dark);
            letter-spacing: -0.01em;
        }
        .hero-bg {
            background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(29, 78, 216, 0.88) 100%), url('/assets/images/2b453eee0aa60ae5.jpg');
            background-size: cover;
            background-position: center;
        }
        .pattern-grid {
            background-image: radial-gradient(#cbd5e1 1px, transparent 1px);
            background-size: 24px 24px;
        }
        .glass-card {
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(226, 232, 240, 0.8);
        }
        .gradient-border-card {
            position: relative;
            background: #ffffff;
            border-radius: 1.25rem;
            border: 1px solid #e2e8f0;
            transition: all 0.3s ease;
        }
        .gradient-border-card:hover {
            border-color: #3b82f6;
            transform: translateY(-4px);
            box-shadow: 0 16px 32px -8px rgba(37, 99, 235, 0.12);
        }