/* roulang page: index */
:root {
            --brand-navy: #0F2537;
            --brand-dark: #0A1626;
            --brand-blue: #0284C7;
            --brand-orange: #EA580C;
            --brand-surface: #F8FAFC;
            --brand-border: #E2E8F0;
        }
        *, *::before, *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
            color: #1E293B;
            background-color: #FFFFFF;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        .hero-banner-bg {
            background-image: linear-gradient(rgba(15, 37, 55, 0.88), rgba(10, 22, 38, 0.94)), url('/assets/images/248098cb7d54772e.jpg');
            background-size: cover;
            background-position: center;
        }
        .deep-stage-bg {
            background-image: linear-gradient(rgba(10, 22, 38, 0.96), rgba(15, 37, 55, 0.96)), url('/assets/images/3eafaa0e13e6b81c.webp');
            background-size: cover;
            background-position: center;
        }
        .card-shadow-hover {
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
        }
        .card-shadow-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(15, 37, 55, 0.08), 0 8px 10px -6px rgba(15, 37, 55, 0.04);
            border-color: #BAE6FD;
        }
        .tab-btn.active {
            background-color: #0284C7;
            color: #FFFFFF;
        }