/* roulang page: index */
:root {
            --primary-bg: #0B131A;
            --surface-bg: #F8FAFC;
            --card-border: rgba(0, 201, 255, 0.2);
            --accent-glow: 0 0 25px rgba(0, 201, 255, 0.15);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: #F8FAFC;
            color: #1E293B;
            overflow-x: hidden;
        }
        .hero-bg {
            background-image: linear-gradient(135deg, rgba(11, 19, 26, 0.94) 0%, rgba(32, 58, 67, 0.90) 100%), url('/assets/images/a932e8f69b86fb92.png');
            background-size: cover;
            background-position: center;
        }
        .dark-section-bg {
            background-image: linear-gradient(180deg, #0B131A 0%, #0F2027 100%), url('/assets/images/80832b974bd56131.jpg');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
        }
        .gradient-text {
            background: linear-gradient(135deg, #00C9FF 0%, #92FE9D 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .gradient-btn {
            background: linear-gradient(135deg, #00C9FF 0%, #203A43 100%);
            transition: all 0.3s ease;
        }
        .gradient-btn:hover {
            box-shadow: 0 8px 24px rgba(0, 201, 255, 0.35);
            transform: translateY(-2px);
        }
        .card-hover {
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 32px -8px rgba(15, 32, 39, 0.12);
        }