/* roulang page: index */
:root {
            --primary: #0A6847;
            --primary-hover: #087f56;
            --accent: #10B981;
            --neon: #00F5A0;
            --dark: #090D16;
            --dark-card: #111827;
            --text-main: #0F172A;
            --text-muted: #475569;
            --border-light: #E2E8F0;
            --border-dark: #1E293B;
            --shadow-soft: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.02);
            --shadow-hover: 0 16px 32px -4px rgba(10, 104, 71, 0.12), 0 4px 12px -2px rgba(10, 104, 71, 0.06);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            color: var(--text-main);
            background-color: #F8FAFC;
            line-height: 1.7;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        /* 呼吸微动与数据脉冲动效 */
        @keyframes radar-sweep {
            0% { transform: scale(0.95); opacity: 0.8; }
            50% { transform: scale(1.05); opacity: 0.3; }
            100% { transform: scale(0.95); opacity: 0.8; }
        }

        .radar-pulse {
            animation: radar-sweep 2.8s infinite ease-in-out;
        }

        /* 自定义卡片过渡 */
        .card-elevate {
            transition: transform 260ms cubic-bezier(0.16, 1, 0.3, 1), box-shadow 260ms cubic-bezier(0.16, 1, 0.3, 1), border-color 260ms ease;
        }
        .card-elevate:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        /* 视窗网格扫描线 */
        .tech-grid-pattern {
            background-size: 32px 32px;
            background-image: 
                linear-gradient(to right, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
        }

        /* 手风琴开关 */
        .faq-content {
            transition: max-height 320ms cubic-bezier(0.4, 0, 0.2, 1), opacity 300ms ease;
        }