/* roulang page: index */
:root {
            --primary-blue: #1e40af;
            --accent-blue: #0284c7;
            --teal-accent: #0d9488;
            --dark-navy: #0f172a;
            --bg-light: #f8fafc;
            --text-main: #334155;
            --text-dark: #0f172a;
            --text-muted: #64748b;
            --border-color: #e2e8f0;
            --radius-default: 1rem;
            --shadow-subtle: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.1);
        }

        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--bg-light);
        }

        .custom-shadow {
            box-shadow: var(--shadow-subtle);
        }

        .hover-lift {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .hover-lift:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .hero-pattern {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 64, 175, 0.85) 100%), url('/assets/images/ad85ff4fe6e1abb8.webp') center/cover no-repeat;
        }

        .cta-gradient {
            background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 50%, #0369a1 100%);
        }

        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }

        .accordion-item.active .accordion-content {
            max-height: 300px;
        }

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