/* roulang page: index */
:root {
            --primary-green: #00875A;
            --primary-emerald: #00B074;
            --night-bg: #0B132B;
            --dark-card: #0F172A;
            --text-main: #0F172A;
            --text-muted: #64748B;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: #F8FAFC;
            color: var(--text-main);
            overflow-x: hidden;
        }
        .gradient-brand {
            background: linear-gradient(135deg, #00875A 0%, #00B074 100%);
        }
        .gradient-dark {
            background: linear-gradient(160deg, #061E14 0%, #0B132B 100%);
        }
        .card-shadow {
            box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-shadow:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 30px -4px rgba(0, 135, 90, 0.15);
        }
        .glass-header {
            backdrop-filter: blur(12px);
            background-color: rgba(255, 255, 255, 0.92);
        }
        /* FAQ手风琴过渡动画 */
        .faq-content {
            transition: max-height 0.35s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .faq-item.active .faq-content {
            max-height: 300px;
            opacity: 1;
        }
        .faq-item.active .faq-arrow {
            transform: rotate(180deg);
        }