/* roulang page: index */
:root {
            --primary: #1B4D3E;
            --primary-dark: #12352B;
            --accent: #CCFF00;
            --accent-orange: #FF5500;
            --bg-surface: #F8FAF9;
            --text-main: #1A201C;
            --text-muted: #4A5568;
            --border-light: #E2E8F0;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #FFFFFF;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        section {
            scroll-margin-top: 76px;
        }

        .cta-btn-primary {
            background-color: var(--accent);
            color: #111614;
            font-weight: 700;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .cta-btn-primary:hover {
            background-color: #b5e600;
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(204, 255, 0, 0.35);
        }
        .cta-btn-primary:active {
            transform: translateY(0);
        }

        .cta-btn-outline {
            border: 1px solid var(--border-light);
            background-color: #FFFFFF;
            color: var(--text-main);
            font-weight: 600;
            transition: all 0.2s ease;
        }
        .cta-btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            background-color: #F8FAF9;
        }

        .tactical-grid {
            background-size: 24px 24px;
            background-image: 
                linear-gradient(to right, rgba(27, 77, 62, 0.05) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(27, 77, 62, 0.05) 1px, transparent 1px);
        }

        .dark-tactical-grid {
            background-size: 24px 24px;
            background-image: 
                linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
        }

        /* 移动端抽屉过渡 */
        #mobile-menu {
            transition: max-height 0.3s ease-in-out, opacity 0.2s ease-in-out;
        }
        #mobile-menu.hidden-drawer {
            max-height: 0;
            opacity: 0;
            overflow: hidden;
            pointer-events: none;
        }
        #mobile-menu.open-drawer {
            max-height: 480px;
            opacity: 1;
            pointer-events: auto;
        }

        /* FAQ 手风琴展开动效 */
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
        }
        .faq-item.active .faq-answer {
            max-height: 600px;
            transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
        }
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }