/* roulang page: index */
:root {
            --brand-dark: #0A192F;
            --brand-navy: #1E3A8A;
            --brand-cyan: #00C2A8;
            --brand-orange: #FF6B35;
            --brand-slate: #0F172A;
            --brand-card: #1E293B;
            --brand-bg: #F8FAFC;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--brand-bg);
            color: #1E293B;
            line-height: 1.75;
        }
        .brand-gradient {
            background: linear-gradient(135deg, #0A192F 0%, #1E3A8A 50%, #00C2A8 100%);
        }
        .hero-overlay {
            background: linear-gradient(180deg, rgba(10, 25, 47, 0.88) 0%, rgba(15, 23, 42, 0.95) 100%);
        }
        .cyan-glow {
            box-shadow: 0 0 25px rgba(0, 194, 168, 0.25);
        }
        .card-shadow {
            box-shadow: 0 10px 30px -5px rgba(10, 25, 47, 0.08);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-shadow:hover {
            box-shadow: 0 20px 40px -10px rgba(10, 25, 47, 0.16);
            transform: translateY(-4px);
        }
        .dark-card-border {
            border: 1px solid rgba(0, 194, 168, 0.2);
        }