/* roulang page: index */
:root {
            --primary: #D9531E;
            --primary-hover: #C85A17;
            --secondary: #2B303A;
            --accent: #E6A23C;
            --bg-light: #F8F9FA;
            --bg-warm: #F4F1EA;
            --text-main: #1F2937;
            --text-muted: #4B5563;
            --border-color: #E5E7EB;
            --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.06);
            --radius-box: 6px;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--bg-light);
            line-height: 1.6;
        }

        /* 锚点导航位移纠偏 */
        section[id] {
            scroll-margin-top: 88px;
        }

        .industrial-grid {
            background-image: radial-gradient(rgba(217, 83, 30, 0.12) 1px, transparent 0);
            background-size: 24px 24px;
        }

        .dark-grid {
            background-image: radial-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 0);
            background-size: 24px 24px;
        }

        .btn-primary {
            background-color: var(--primary);
            color: #ffffff;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            border-radius: var(--radius-box);
        }
        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(217, 83, 30, 0.35);
        }

        .btn-outline {
            border: 1.5px solid var(--secondary);
            color: var(--secondary);
            transition: all 0.25s ease;
            border-radius: var(--radius-box);
        }
        .btn-outline:hover {
            background-color: var(--secondary);
            color: #ffffff;
        }

        /* 手风琴折叠状态动画 */
        .faq-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out, padding 0.35s ease;
        }
        .faq-item.active .faq-content {
            max-height: 280px;
            padding-top: 14px;
        }
        .faq-item.active .faq-arrow {
            transform: rotate(180deg);
        }

        /* 自定义微阴影与边框 */
        .card-custom {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-box);
            box-shadow: var(--shadow-card);
            transition: all 0.3s ease;
        }
        .card-custom:hover {
            border-color: #D1D5DB;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
        }

        /* 隐藏原生滚动条 */
        .no-scrollbar::-webkit-scrollbar {
            display: none;
        }
        .no-scrollbar {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }