/* roulang page: index */
:root {
            --primary: #0F2C59;
            --secondary: #1E40AF;
            --accent: #059669;
            --warn: #D97706;
            --darkb: #0B132B;
            --bg-light: #F8FAFC;
            --text-main: #1E293B;
            --text-muted: #475569;
            --border-color: #E2E8F0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--bg-light);
            line-height: 1.6;
        }
        .coupon-glow {
            box-shadow: 0 10px 25px -5px rgba(217, 119, 6, 0.25), 0 8px 10px -6px rgba(217, 119, 6, 0.2);
        }
        .tech-card {
            transition: all 0.25s ease-in-out;
        }
        .tech-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px -6px rgba(15, 44, 89, 0.12);
        }