/* roulang page: index */
:root {
            --brand-primary: #00D084;
            --brand-deep: #0A2540;
            --brand-navy: #0B132B;
            --brand-accent: #38BDF8;
            --bg-base: #F8FAFC;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.75;
            letter-spacing: -0.015em;
            background-color: var(--bg-base);
            color: #1E293B;
            overflow-x: hidden;
        }
        .hero-title {
            line-height: 1.2;
        }
        .tech-grid-bg {
            background-image: radial-gradient(rgba(0, 208, 132, 0.08) 1px, transparent 1px);
            background-size: 24px 24px;
        }
        .dark-grid-bg {
            background-image: radial-gradient(rgba(56, 189, 248, 0.1) 1px, transparent 1px);
            background-size: 28px 28px;
        }
        details summary::-webkit-details-marker {
            display: none;
        }