/* roulang page: index */
:root {
            --color-navy: #0F2C59;
            --color-dark: #0A192F;
            --color-teal: #00A896;
            --color-orange: #FF6B35;
            --color-bg: #F8FAFC;
            --color-text: #334155;
            --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Source Han Sans CN", sans-serif;
        }
        body {
            font-family: var(--font-stack);
            background-color: var(--color-bg);
            color: var(--color-text);
            overflow-x: hidden;
            scroll-behavior: smooth;
        }
        .hero-bg {
            background-image: linear-gradient(rgba(10, 25, 47, 0.92), rgba(15, 44, 89, 0.88)), url('/assets/images/e4b000ee8186a8ce.jpg');
            background-size: cover;
            background-position: center;
        }
        .pattern-bg {
            background-image: linear-gradient(rgba(10, 25, 47, 0.95), rgba(10, 25, 47, 0.97)), url('/assets/images/8c539dca32f8f82c.jpg');
            background-size: cover;
            background-position: center;
        }
        .cta-banner-bg {
            background-image: linear-gradient(135deg, rgba(15, 44, 89, 0.96) 0%, rgba(0, 168, 150, 0.9) 100%), url('/assets/images/cd49da67c13d46c0.jpg');
            background-size: cover;
            background-position: center;
        }
        .card-shadow {
            box-shadow: 0 4px 20px -2px rgba(15, 44, 89, 0.07);
        }
        .card-shadow-hover {
            transition: all 0.25s ease-in-out;
        }
        .card-shadow-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 28px -4px rgba(15, 44, 89, 0.12);
        }