/* roulang page: index */
:root {
            --primary: #1E40AF;
            --secondary: #0284C7;
            --dark-accent: #0F172A;
            --bg-slate: #F8FAFC;
            --text-dark: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-light: #E2E8F0;
            --shadow-sm: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 20px 25px -5px rgba(30, 64, 175, 0.1);
        }
        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-slate);
            color: var(--text-body);
        }
        body {
            margin: 0;
            padding: 0;
            line-height: 1.6;
        }
        .custom-card {
            background-color: #ffffff;
            border: 1px solid var(--border-light);
            border-radius: 1rem;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .custom-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(30, 64, 175, 0.2);
        }
        .glow-btn {
            background: linear-gradient(135deg, #1E40AF 0%, #0284C7 100%);
            box-shadow: 0 4px 14px 0 rgba(30, 64, 175, 0.25);
            transition: all 0.3s ease;
        }
        .glow-btn:hover {
            box-shadow: 0 6px 20px 0 rgba(30, 64, 175, 0.4);
            transform: translateY(-1px);
        }
        .hero-mesh {
            background-image: radial-gradient(at 0% 0%, rgba(2, 132, 199, 0.12) 0px, transparent 50%),
                              radial-gradient(at 100% 100%, rgba(30, 64, 175, 0.08) 0px, transparent 50%);
        }