/* roulang page: index */
:root {
            --primary: #0F172A;
            --primary-light: #1E293B;
            --accent: #2563EB;
            --accent-hover: #1D4ED8;
            --bg-body: #F8FAFC;
            --bg-card: #FFFFFF;
            --border-color: #E2E8F0;
            --text-title: #0F172A;
            --text-body: #475569;
            --text-muted: #94A3B8;
        }

        body {
            background-color: var(--bg-body);
            color: var(--text-body);
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            -webkit-font-smoothing: antialiased;
        }

        .hero-bg {
            background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(30, 41, 59, 0.92) 100%), url('/assets/images/2ed7e343d0116661.webp');
            background-size: cover;
            background-position: center;
        }

        .dark-tech-bg {
            background-image: linear-gradient(180deg, rgba(15, 23, 42, 0.98) 0%, rgba(2, 6, 23, 0.99) 100%), url('/assets/images/c9e5caee86f7385e.webp');
            background-size: cover;
            background-position: center;
        }

        .card-shadow {
            box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 10px 15px -3px rgba(0, 0, 0, 0.02);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .card-shadow:hover {
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
            transform: translateY(-2px);
        }

        .faq-content {
            transition: max-height 0.35s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            opacity: 0;
            overflow: hidden;
        }

        .faq-item.active .faq-content {
            max-height: 240px;
            opacity: 1;
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }

        @keyframes progressGlow {
            0%, 100% { opacity: 0.8; }
            50% { opacity: 1; }
        }
        .animate-glow {
            animation: progressGlow 2.5s infinite;
        }