/* roulang page: index */
:root {
            --primary: #0284C7;
            --primary-dark: #0369A1;
            --accent: #0F766E;
            --canvas: #FFFFFF;
            --surface-alt: #F8FAFC;
            --text-main: #0F172A;
            --text-secondary: #475569;
            --border-line: #E2E8F0;
        }
        body {
            font-family: var(--font-sans, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif);
            color: var(--text-main);
            background-color: var(--canvas);
            -webkit-font-smoothing: antialiased;
        }
        .hero-banner-bg {
            background-image: linear-gradient(to right, rgba(15, 23, 42, 0.95) 0%, rgba(15, 23, 42, 0.85) 50%, rgba(15, 23, 42, 0.6) 100%), url('/assets/images/b5c820e587c97ffc.webp');
            background-size: cover;
            background-position: center;
        }
        .tech-glow-border {
            border: 1px solid rgba(226, 232, 240, 0.8);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .tech-glow-border:hover {
            border-color: rgba(2, 132, 199, 0.5);
            box-shadow: 0 10px 25px -5px rgba(2, 132, 199, 0.1), 0 8px 10px -6px rgba(2, 132, 199, 0.1);
        }
        .faq-content {
            transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .faq-content.open {
            max-height: 250px;
            opacity: 1;
        }