/* roulang page: index */
:root {
            --brand-dark: #0A0F1D;
            --brand-slate: #0F172A;
            --brand-emerald: #10B981;
            --brand-rose: #F43F5E;
            --brand-indigo: #6366F1;
            --bg-base: #F8FAFC;
            --text-main: #334155;
            --text-muted: #64748B;
            --border-light: #E2E8F0;
        }

        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }

        body {
            background-color: var(--bg-base);
            color: var(--text-main);
            line-height: 1.7;
        }

        .hero-bg {
            background-image: linear-gradient(rgba(10, 15, 29, 0.82), rgba(10, 15, 29, 0.94)), url('/assets/images/096aaa200d2c2c57.webp');
            background-size: cover;
            background-position: center;
        }

        .dark-section-bg {
            background-image: radial-gradient(circle at 50% 0%, #1e293b 0%, #0a0f1d 75%);
        }

        .tech-card {
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: 12px;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .tech-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 32px -8px rgba(15, 23, 42, 0.08);
            border-color: #CBD5E1;
        }

        .stat-badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 10px;
            border-radius: 9999px;
            font-size: 0.8rem;
            font-weight: 600;
        }