/* roulang page: index */
:root {
            --primary: #0F172A;
            --brand-blue: #1D4ED8;
            --brand-indigo: #4338CA;
            --accent-green: #10B981;
            --accent-amber: #F59E0B;
            --bg-light: #F8FAFC;
            --card-border: #E2E8F0;
            --text-main: #1E293B;
            --text-muted: #64748B;
        }

        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-light);
            color: var(--text-main);
            line-height: 1.65;
            scroll-behavior: smooth;
        }

        .hero-banner-overlay {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(30, 58, 138, 0.88) 100%);
        }

        .dark-section-bg {
            background-color: #090D16;
        }

        .custom-card {
            background-color: #ffffff;
            border: 1px solid var(--card-border);
            border-radius: 0.75rem;
            box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.04);
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .custom-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 24px -6px rgba(15, 23, 42, 0.08);
            border-color: #CBD5E1;
        }

        .accordion-content {
            transition: max-height 0.3s ease-out, padding 0.3s ease;
        }

        .hide-scrollbar::-webkit-scrollbar {
            display: none;
        }
        .hide-scrollbar {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }

        /* 移动端菜单开关 */
        #mobile-menu {
            display: none;
        }
        #mobile-menu.active {
            display: block;
        }