/* roulang page: index */
:root {
            --primary: #0F172A;
            --brand: #059669;
            --accent: #2563EB;
            --bg-slate: #F8FAFC;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-slate);
            color: #334155;
            line-height: 1.7;
        }
        .hero-banner-bg {
            background-image: linear-gradient(to right, rgba(15, 23, 42, 0.94), rgba(15, 23, 42, 0.82)), url('/assets/images/60bf7453fa65266a.jpg');
            background-size: cover;
            background-position: center;
        }
        .tech-dark-bg {
            background-image: linear-gradient(to bottom, rgba(15, 23, 42, 0.98), rgba(15, 23, 42, 0.95)), url('/assets/images/cb745e48399278b2.jpg');
            background-size: cover;
            background-position: center;
        }
        details > summary {
            list-style: none;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }
        details[open] .faq-icon {
            transform: rotate(180deg);
        }