/* roulang page: index */
:root {
            --primary-color: #0EA5E9;
            --primary-hover: #0284C7;
            --secondary-color: #6366F1;
            --dark-bg: #0F172A;
            --dark-card: #1E293B;
            --light-bg: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #475569;
            --border-color: #E2E8F0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-full: 9999px;
            --shadow-subtle: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-float: 0 20px 25px -5px rgba(15, 23, 42, 0.08);
            --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }

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

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

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-smooth);
        }

        /* 顶部导航 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1030;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.8);
            box-shadow: 0 1px 3px rgba(15, 23, 42, 0.03);
        }

        .navbar-brand-custom {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: -0.02em;
        }

        .navbar-brand-custom svg {
            fill: var(--primary-color);
        }

        .nav-link-custom {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-muted);
            padding: 0.5rem 0.9rem !important;
            border-radius: var(--radius-sm);
        }

        .nav-link-custom:hover, .nav-link-custom.active {
            color: var(--primary-color);
        }

        .nav-search-box {
            position: relative;
            max-width: 180px;
        }

        .nav-search-input {
            width: 100%;
            padding: 6px 14px;
            font-size: 0.85rem;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-full);
            outline: none;
            background: #fff;
            transition: var(--transition-smooth);
        }

        .nav-search-input:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
        }

        .btn-cta-nav {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: #fff !important;
            font-weight: 600;
            font-size: 0.9rem;
            padding: 8px 20px;
            border-radius: var(--radius-full);
            border: none;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 40px;
        }

        .btn-cta-nav:hover {
            opacity: 0.92;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
        }

        /* 基础组件规范 */
        .section-padding {
            padding: 96px 0;
        }

        .section-title-wrap {
            margin-bottom: 54px;
        }

        .section-badge {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--primary-color);
            background: rgba(14, 165, 233, 0.08);
            border: 1px solid rgba(14, 165, 233, 0.2);
            padding: 4px 14px;
            border-radius: var(--radius-full);
            margin-bottom: 12px;
        }

        .section-title {
            font-size: 2.25rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--text-main);
            margin-bottom: 16px;
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 680px;
            margin: 0 auto;
        }

        .custom-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            box-shadow: var(--shadow-subtle);
            transition: var(--transition-smooth);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .custom-card:hover {
            transform: translateY(-4px);
            border-color: var(--primary-color);
            box-shadow: var(--shadow-float);
        }

        .btn-solid-primary {
            background-color: var(--primary-color);
            color: #fff;
            font-weight: 600;
            padding: 12px 28px;
            border-radius: var(--radius-full);
            border: none;
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition-smooth);
        }

        .btn-solid-primary:hover {
            background-color: var(--primary-hover);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(14, 165, 233, 0.25);
        }

        .btn-outline-custom {
            border: 1px solid var(--border-color);
            color: var(--text-main);
            font-weight: 600;
            padding: 12px 28px;
            border-radius: var(--radius-full);
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: #fff;
            transition: var(--transition-smooth);
        }

        .btn-outline-custom:hover {
            border-color: var(--text-main);
            color: var(--text-main);
            background: #f1f5f9;
        }

        /* 1. Hero 工业参数首屏 */
        .hero-section {
            background: linear-gradient(180deg, #FFFFFF 0%, #F1F5F9 100%);
            padding: 70px 0 60px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .hero-grid-board {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px;
            box-shadow: var(--shadow-float);
        }

        .param-badge-row {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 24px;
        }

        .param-tag {
            font-family: monospace;
            font-size: 0.85rem;
            background: #F8FAFC;
            border: 1px solid var(--border-color);
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            color: var(--text-muted);
        }

        .hero-banner-img {
            width: 100%;
            height: 380px;
            object-fit: cover;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
        }

        .hero-metric-box {
            border-left: 3px solid var(--primary-color);
            padding-left: 16px;
        }

        /* 2. 卖点三连 */
        .trio-card {
            border-top: 4px solid var(--primary-color);
        }

        /* 3. 入口矩阵 */
        .portal-item {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            display: flex;
            align-items: flex-start;
            gap: 16px;
            transition: var(--transition-smooth);
        }

        .portal-item:hover {
            border-color: var(--secondary-color);
            transform: translateX(4px);
        }

        .portal-icon {
            width: 44px;
            height: 44px;
            background: rgba(99, 102, 241, 0.1);
            color: var(--secondary-color);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-weight: 700;
        }

        /* 5. 深色沉浸式案例区 */
        .dark-vision-section {
            background-color: var(--dark-bg);
            color: #F8FAFC;
        }

        .dark-vision-section .section-title {
            color: #FFFFFF;
        }

        .dark-vision-section .section-desc {
            color: #94A3B8;
        }

        .console-mockup {
            background: #020617;
            border: 1px solid #334155;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
        }

        .console-header {
            background: #1E293B;
            padding: 10px 16px;
            display: flex;
            align-items: center;
            gap: 8px;
            border-bottom: 1px solid #334155;
        }

        .console-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: #475569;
        }

        .console-dot.red { background: #EF4444; }
        .console-dot.yellow { background: #F59E0B; }
        .console-dot.green { background: #10B981; }

        .console-body {
            padding: 24px;
        }

        /* 7. 关键数据统计条 */
        .metric-strip-section {
            background: #FFFFFF;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            padding: 56px 0;
        }

        .metric-number {
            font-size: 2.75rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1.1;
            letter-spacing: -0.03em;
        }

        /* 11. FAQ 手风琴 */
        .accordion-item-custom {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm) !important;
            margin-bottom: 12px;
            overflow: hidden;
        }

        .accordion-button-custom {
            width: 100%;
            padding: 20px 24px;
            text-align: left;
            background: #FFFFFF;
            border: none;
            font-weight: 700;
            color: var(--text-main);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
        }

        .accordion-button-custom:not(.collapsed) {
            color: var(--primary-color);
            background: #F8FAFC;
        }

        .accordion-body-custom {
            padding: 0 24px 20px 24px;
            color: var(--text-muted);
            font-size: 0.95rem;
            background: #F8FAFC;
        }

        /* 12. 底部转化表单卡 */
        .lead-cta-card {
            background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
            border-radius: var(--radius-md);
            padding: 48px;
            color: #FFFFFF;
            border: 1px solid #334155;
            box-shadow: var(--shadow-float);
        }

        .form-input-custom {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid #475569;
            color: #fff;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            width: 100%;
            outline: none;
        }

        .form-input-custom:focus {
            border-color: var(--primary-color);
            background: rgba(255, 255, 255, 0.12);
        }

        /* Footer */
        .site-footer {
            background: #090D16;
            color: #94A3B8;
            padding: 64px 0 32px 0;
            font-size: 0.9rem;
            border-top: 1px solid #1E293B;
        }

        .footer-brand {
            font-size: 1.25rem;
            font-weight: 800;
            color: #FFFFFF;
            margin-bottom: 16px;
            display: inline-block;
        }

        .footer-link {
            color: #94A3B8;
            display: block;
            margin-bottom: 8px;
        }

        .footer-link:hover {
            color: #FFFFFF;
        }

        .footer-bottom {
            margin-top: 48px;
            padding-top: 24px;
            border-top: 1px solid #1E293B;
            font-size: 0.8rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }

        /* 响应式断点控制 */
        @media (max-width: 991px) {
            .section-title {
                font-size: 1.85rem;
            }
            .hero-banner-img {
                height: 280px;
                margin-top: 24px;
            }
            .lead-cta-card {
                padding: 32px 20px;
            }
        }

        @media (max-width: 576px) {
            .section-padding {
                padding: 64px 0;
            }
            .hero-section {
                padding: 40px 0;
            }
            .metric-number {
                font-size: 2.2rem;
            }
        }