/* roulang page: index */
:root {
            --primary: #0F2C59;
            --primary-dark: #0B192C;
            --secondary: #0077B6;
            --accent: #00B4D8;
            --bg-light: #F8FAFC;
            --bg-white: #FFFFFF;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
            --shadow-card: 0 4px 20px rgba(15, 44, 89, 0.06);
            --shadow-hover: 0 12px 30px rgba(15, 44, 89, 0.12);
            --radius-main: 8px;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--text-main);
            background-color: var(--bg-white);
            line-height: 1.6;
            scroll-behavior: smooth;
        }

        .hero-bg {
            background-image: linear-gradient(135deg, rgba(11, 25, 44, 0.94) 0%, rgba(15, 44, 89, 0.88) 100%), url('/assets/images/d5a6fe33789ee40c.webp');
            background-size: cover;
            background-position: center;
        }

        .dark-section-bg {
            background-image: linear-gradient(rgba(11, 25, 44, 0.96), rgba(11, 25, 44, 0.96)), url('/assets/images/00d0b179a34ec4e8.webp');
            background-size: cover;
            background-position: center;
        }

        .card-transition {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        .faq-item.active .faq-content {
            max-height: 240px;
            padding-top: 0.75rem;
            padding-bottom: 0.75rem;
        }

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

        /* 移动端菜单过度 */
        #mobile-menu {
            transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out;
        }
        #mobile-menu.hidden-menu {
            transform: translateY(-100%);
            opacity: 0;
            pointer-events: none;
        }
        #mobile-menu.active-menu {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }