/* roulang page: index */
:root {
            --primary: #0B192C;
            --accent: #008B74;
            --muted-amber: #D97706;
            --bg-light: #F8FAFC;
            --surface-white: #FFFFFF;
            --text-main: #1E293B;
            --text-muted: #64748B;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
            background-color: #FFFFFF;
            color: var(--text-main);
            line-height: 1.7;
        }
        .hero-banner-bg {
            background-image: linear-gradient(to right, rgba(11, 25, 44, 0.95), rgba(11, 25, 44, 0.82)), url('/assets/images/b1f4fff85e9593ad.jpg');
            background-size: cover;
            background-position: center;
        }
        .tech-dark-bg {
            background-image: linear-gradient(to bottom, #030712, #0B192C);
        }
        .card-custom {
            box-shadow: 0 4px 20px -2px rgba(11, 25, 44, 0.05);
            transition: transform 0.25s ease, box-shadow 0.25s ease;
        }
        .card-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 28px -4px rgba(11, 25, 44, 0.1);
        }