/* roulang page: index */
:root {
            --primary: #1E40AF;
            --primary-dark: #1E3A8A;
            --accent: #0D9488;
            --bg-body: #F8FAFC;
            --surface: #FFFFFF;
            --text-main: #0F172A;
            --text-muted: #475569;
            --border: #E2E8F0;
            --shadow-subtle: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
            --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            background-color: var(--bg-body);
            color: var(--text-main);
            line-height: 1.6;
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
        }

        .hero-glow-bg {
            background-color: #0f172a;
            background-image: 
                radial-gradient(at 0% 0%, rgba(30, 64, 175, 0.35) 0px, transparent 50%),
                radial-gradient(at 100% 100%, rgba(13, 148, 136, 0.25) 0px, transparent 50%),
                linear-gradient(rgba(15, 23, 42, 0.88), rgba(15, 23, 42, 0.94)),
                url('/assets/images/c522e2c7e8eec073.webp');
            background-size: cover;
            background-position: center;
        }

        .card-custom {
            background-color: var(--surface);
            border: 1px solid var(--border);
            border-radius: 0.75rem;
            transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease, border-color 0.3s ease;
        }

        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: #cbd5e1;
        }

        .faq-accordion[open] .faq-icon {
            transform: rotate(180deg);
        }

        .faq-accordion summary {
            list-style: none;
        }
        .faq-accordion summary::-webkit-details-marker {
            display: none;
        }

        /* 统一表单控件焦点状态 */
        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.15);
        }