/* roulang page: index */
:root {
            --primary: #0284c7;
            --primary-dark: #0369a1;
            --secondary: #0d9488;
            --dark-graphite: #0f172a;
            --surface-gray: #f8fafc;
            --border-light: #e2e8f0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Source Han Sans CN", sans-serif;
            color: #334155;
            background-color: #ffffff;
            -webkit-font-smoothing: antialiased;
        }
        .hero-bg {
            background-image: linear-gradient(rgba(15, 23, 42, 0.88), rgba(15, 23, 42, 0.82)), url('/assets/images/683ebc35304865a6.webp');
            background-size: cover;
            background-position: center;
        }
        .concept-bg {
            background-image: linear-gradient(rgba(15, 23, 42, 0.94), rgba(15, 23, 42, 0.94)), url('/assets/images/520dac37cb5b96b4.webp');
            background-size: cover;
            background-position: center;
        }
        .card-subtle-glow {
            box-shadow: 0 4px 20px -2px rgba(2, 132, 199, 0.08);
            border: 1px solid #e2e8f0;
            transition: all 0.25s ease-in-out;
        }
        .card-subtle-glow:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px -4px rgba(2, 132, 199, 0.16);
            border-color: #93c5fd;
        }
        .partner-logo-filter {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: all 0.3s ease;
        }
        .partner-logo-filter:hover {
            filter: grayscale(0%);
            opacity: 1;
        }