/* roulang page: index */
:root {
            --color-primary: #0F2444;
            --color-primary-dark: #0A1526;
            --color-accent: #0EA5E9;
            --color-success: #10B981;
            --color-bg-light: #F8FAFC;
            --color-border: #E2E8F0;
            --color-text-main: #1E293B;
            --color-text-muted: #64748B;
        }

        body {
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--color-text-main);
            background-color: #FFFFFF;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        .hero-overlay {
            background: linear-gradient(135deg, rgba(10, 21, 38, 0.94) 0%, rgba(15, 36, 68, 0.88) 60%, rgba(14, 165, 233, 0.65) 100%);
        }

        .dark-section-bg {
            background-color: var(--color-primary-dark);
            background-image: radial-gradient(rgba(14, 165, 233, 0.12) 1px, transparent 1px);
            background-size: 32px 32px;
        }

        .card-shadow {
            box-shadow: 0 4px 20px -2px rgba(15, 36, 68, 0.06);
            transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .card-shadow:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 28px -4px rgba(15, 36, 68, 0.12);
        }

        .faq-item[open] summary svg {
            transform: rotate(180deg);
        }