/* roulang page: index */
:root {
            --brand-obsidian: #0b1120;
            --brand-navy: #1e3a8a;
            --brand-cyan: #0284c7;
            --brand-emerald: #0d9488;
            --text-main: #0f172a;
            --text-muted: #475569;
            --border-soft: rgba(2, 132, 199, 0.15);
        }
        html { scroll-behavior: smooth; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; background-color: #f8fafc; color: var(--text-main); }
        .hero-bg {
            background: linear-gradient(135deg, rgba(11, 17, 32, 0.94) 0%, rgba(30, 58, 138, 0.88) 100%), url('/assets/images/cac9211165da0003.png') center/cover no-repeat;
        }
        .deep-mesh-bg {
            background: linear-gradient(180deg, #060913 0%, #0b1120 50%, #0f172a 100%);
        }
        .card-custom {
            transition: all 0.25s ease-in-out;
            box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05);
            border: 1px solid rgba(226, 232, 240, 0.8);
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 30px -10px rgba(15, 23, 42, 0.12);
            border-color: rgba(2, 132, 199, 0.35);
        }
        .dark-card-custom {
            background: rgba(15, 23, 42, 0.7);
            border: 1px solid rgba(2, 132, 199, 0.2);
            backdrop-filter: blur(8px);
            transition: all 0.25s ease-in-out;
        }
        .dark-card-custom:hover {
            border-color: rgba(13, 148, 136, 0.5);
            transform: translateY(-3px);
        }
        .btn-gradient-cta {
            background: linear-gradient(135deg, #1e3a8a 0%, #0284c7 50%, #0d9488 100%);
            box-shadow: 0 4px 14px 0 rgba(2, 132, 199, 0.39);
        }
        .btn-gradient-cta:hover {
            box-shadow: 0 6px 20px rgba(13, 148, 136, 0.45);
        }