/* roulang page: index */
:root {
            --primary-dark: #1E232A;
            --primary-slate: #2B323D;
            --surface-dark: #14171C;
            --accent-orange: #F26419;
            --accent-orange-hover: #d9530e;
            --accent-blue: #0066FF;
            --bg-light: #F8F9FA;
            --bg-card: #FFFFFF;
            --text-heading: #0F1115;
            --text-body: #4A5568;
            --text-muted: #718096;
            --border-light: #E2E8F0;
            --radius-sm: 4px;
            --radius-md: 6px;
            --radius-lg: 10px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
            --shadow-lg: 0 10px 24px rgba(0,0,0,0.09), 0 4px 8px rgba(0,0,0,0.04);
            --container-w: 1280px;
        }

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

        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-body);
            background-color: var(--bg-light);
            font-size: 16px;
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button, input, select, textarea {
            font-family: inherit;
        }

        .container {
            width: 100%;
            max-width: var(--container-w);
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* 统一标题排版 */
        .section-header {
            text-align: center;
            max-width: 820px;
            margin: 0 auto 50px;
        }
        .section-header .section-tag {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--accent-orange);
            text-transform: uppercase;
            letter-spacing: 1.5px;
            margin-bottom: 8px;
            background: rgba(242, 100, 25, 0.08);
            padding: 4px 12px;
            border-radius: var(--radius-sm);
        }
        .section-header h2 {
            font-size: 2.2rem;
            color: var(--text-heading);
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .section-header p {
            font-size: 1.05rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* 顶部导航 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: #fff;
            box-shadow: var(--shadow-sm);
        }
        .top-bar {
            background-color: var(--primary-dark);
            color: #A0AEC0;
            font-size: 0.82rem;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .top-bar-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .top-bar-meta {
            display: flex;
            gap: 24px;
        }
        .top-bar-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav {
            padding: 16px 0;
            background-color: #fff;
        }
        .main-nav-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .brand-logo {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--primary-dark);
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.5px;
        }
        .brand-logo i {
            color: var(--accent-orange);
        }
        .nav-links {
            display: flex;
            gap: 28px;
            list-style: none;
            align-items: center;
        }
        .nav-links a {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--primary-slate);
            padding: 6px 2px;
            position: relative;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent-orange);
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--accent-orange);
        }
        .nav-action {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--accent-orange);
            color: #fff;
            padding: 10px 22px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all 0.2s ease;
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            background-color: var(--accent-orange-hover);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(242, 100, 25, 0.3);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: transparent;
            color: var(--text-heading);
            padding: 10px 20px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            border: 1px solid var(--border-light);
            transition: all 0.2s ease;
        }
        .btn-outline:hover {
            border-color: var(--text-heading);
            background-color: rgba(0,0,0,0.02);
        }
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--primary-dark);
            cursor: pointer;
        }

        /* 板块公用 */
        section {
            padding: 90px 0;
            position: relative;
        }
        .bg-white {
            background-color: #ffffff;
        }
        .bg-muted {
            background-color: var(--bg-light);
        }
        .bg-dark {
            background-color: var(--surface-dark);
            color: #CBD5E0;
        }
        .bg-dark .section-header h2 {
            color: #FFFFFF;
        }
        .bg-dark .section-header p {
            color: #A0AEC0;
        }

        /* 板块 1: 无大图首屏 (Hero: 图标矩阵 + 状态条 + 短标题) */
        .hero-section {
            background: linear-gradient(135deg, #181C23 0%, #252B35 100%);
            color: #fff;
            padding: 70px 0 80px;
            border-bottom: 3px solid var(--accent-orange);
        }
        .hero-status-strip {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.15);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            color: #E2E8F0;
            margin-bottom: 24px;
        }
        .hero-status-strip .pulse-dot {
            width: 8px;
            height: 8px;
            background-color: #10B981;
            border-radius: 50%;
            box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.25);
        }
        .hero-title {
            font-size: 2.8rem;
            line-height: 1.25;
            font-weight: 800;
            color: #FFFFFF;
            margin-bottom: 20px;
            max-width: 900px;
        }
        .hero-desc {
            font-size: 1.12rem;
            color: #CBD5E0;
            line-height: 1.8;
            max-width: 880px;
            margin-bottom: 40px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            margin-bottom: 50px;
            flex-wrap: wrap;
        }
        .hero-icon-matrix {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            background: rgba(255, 255, 255, 0.04);
            padding: 24px;
            border-radius: var(--radius-lg);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .hero-matrix-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
        }
        .hero-matrix-icon {
            width: 44px;
            height: 44px;
            background: rgba(242, 100, 25, 0.15);
            color: var(--accent-orange);
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-md);
            font-size: 1.2rem;
            flex-shrink: 0;
        }
        .hero-matrix-info h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 4px;
        }
        .hero-matrix-info p {
            font-size: 0.85rem;
            color: #A0AEC0;
            line-height: 1.5;
        }

        /* 板块 2: 指标看板 (Metric Dashboard) */
        .metrics-strip {
            padding: 40px 0;
            background: #fff;
            box-shadow: var(--shadow-sm);
            border-bottom: 1px solid var(--border-light);
        }
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .metric-card {
            border-left: 3px solid var(--accent-orange);
            padding-left: 20px;
        }
        .metric-value {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary-dark);
            line-height: 1.1;
            margin-bottom: 6px;
            font-feature-settings: "tnum";
        }
        .metric-value span {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--accent-orange);
            margin-left: 4px;
        }
        .metric-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* 板块 3: 能力概览 (Brand & Capabilities) */
        .capability-split {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        .capability-image-box {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }
        .capability-image-box img {
            width: 100%;
            height: 440px;
            object-fit: cover;
        }
        .capability-badge-float {
            position: absolute;
            bottom: 24px;
            left: 24px;
            background: rgba(20, 23, 28, 0.9);
            color: #fff;
            padding: 16px 22px;
            border-radius: var(--radius-md);
            border-left: 4px solid var(--accent-orange);
            backdrop-filter: blur(4px);
        }
        .capability-badge-float strong {
            display: block;
            font-size: 1.25rem;
            color: #fff;
        }
        .capability-badge-float span {
            font-size: 0.85rem;
            color: #CBD5E0;
        }
        .capability-points {
            margin-top: 24px;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .cap-point-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
        }
        .cap-point-num {
            width: 32px;
            height: 32px;
            background: var(--bg-light);
            border: 1px solid var(--border-light);
            color: var(--primary-dark);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .cap-point-text h4 {
            font-size: 1.1rem;
            color: var(--text-heading);
            margin-bottom: 4px;
            font-weight: 700;
        }
        .cap-point-text p {
            font-size: 0.95rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 板块 4: 行业场景 (Application Scenarios) */
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .scenario-card {
            background: #fff;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
        }
        .scenario-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(242, 100, 25, 0.4);
        }
        .scenario-img {
            height: 180px;
            overflow: hidden;
        }
        .scenario-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .scenario-card:hover .scenario-img img {
            transform: scale(1.05);
        }
        .scenario-body {
            padding: 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .scenario-body h3 {
            font-size: 1.2rem;
            color: var(--text-heading);
            margin-bottom: 10px;
        }
        .scenario-body p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 16px;
            line-height: 1.6;
        }
        .scenario-tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-top: auto;
        }
        .scenario-tag-list span {
            background: var(--bg-light);
            border: 1px solid var(--border-light);
            font-size: 0.75rem;
            color: var(--primary-slate);
            padding: 2px 8px;
            border-radius: var(--radius-sm);
        }

        /* 板块 5: 方案矩阵 (Core Products Matrix) */
        .product-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .product-card {
            background: #fff;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
        }
        .product-card:hover {
            border-color: var(--accent-orange);
            box-shadow: var(--shadow-md);
        }
        .product-card-thumb {
            height: 220px;
            overflow: hidden;
            background: #eee;
        }
        .product-card-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .product-card-content {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .product-card-content h3 {
            font-size: 1.3rem;
            color: var(--text-heading);
            margin-bottom: 10px;
            font-weight: 700;
        }
        .product-card-content p {
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 18px;
        }
        .specs-table {
            width: 100%;
            font-size: 0.85rem;
            border-collapse: collapse;
            margin-bottom: 20px;
        }
        .specs-table td {
            padding: 6px 0;
            border-bottom: 1px dashed var(--border-light);
        }
        .specs-table td:first-child {
            color: var(--text-muted);
            width: 40%;
        }
        .specs-table td:last-child {
            color: var(--text-heading);
            font-weight: 600;
            text-align: right;
        }
        .product-card-footer {
            margin-top: auto;
            padding-top: 14px;
        }
        .btn-link-action {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--accent-orange);
            font-weight: 700;
            font-size: 0.9rem;
        }
        .btn-link-action:hover {
            text-decoration: underline;
        }

        /* 板块 6: 核心优势矩阵 (Core Advantages - 6卡片) */
        .advantage-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 26px;
        }
        .adv-card {
            background: #fff;
            padding: 30px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all 0.2s ease;
        }
        .adv-card:hover {
            border-color: var(--accent-orange);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .adv-icon {
            font-size: 1.8rem;
            color: var(--accent-orange);
            margin-bottom: 18px;
        }
        .adv-card h3 {
            font-size: 1.15rem;
            color: var(--text-heading);
            margin-bottom: 10px;
            font-weight: 700;
        }
        .adv-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 板块 7: 资质与质保体系 (Quality & Certifications) */
        .quality-section-inner {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .quality-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .quality-item {
            background: #fff;
            border: 1px solid var(--border-light);
            padding: 18px 24px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .quality-item .q-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-heading);
        }
        .quality-item .q-meta {
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .quality-item .q-badge {
            background: rgba(16, 185, 129, 0.1);
            color: #10B981;
            padding: 4px 10px;
            border-radius: var(--radius-sm);
            font-size: 0.8rem;
            font-weight: 600;
        }

        /* 板块 8: 交付流程 (Engineering & Delivery Process) */
        .process-flow {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 16px;
            position: relative;
        }
        .process-flow::before {
            content: '';
            position: absolute;
            top: 36px;
            left: 5%;
            right: 5%;
            height: 2px;
            background: var(--border-light);
            z-index: 1;
        }
        .process-step-card {
            background: #fff;
            padding: 24px 18px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            text-align: center;
            position: relative;
            z-index: 2;
        }
        .step-circle {
            width: 50px;
            height: 50px;
            background: #fff;
            border: 2px solid var(--accent-orange);
            color: var(--accent-orange);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 800;
            margin: 0 auto 16px;
        }
        .process-step-card h4 {
            font-size: 1.05rem;
            color: var(--text-heading);
            margin-bottom: 8px;
        }
        .process-step-card p {
            font-size: 0.82rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* 板块 9: 工业里程碑与结果对比 (Dark Engineering Milestone) */
        .dark-milestone-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        .milestone-data-box {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 30px;
            border-radius: var(--radius-lg);
        }
        .data-compare-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .data-compare-item:last-child {
            border-bottom: none;
        }
        .data-compare-title {
            font-size: 0.95rem;
            color: #E2E8F0;
        }
        .data-compare-bars {
            text-align: right;
        }
        .data-val-highlight {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--accent-orange);
        }
        .data-val-old {
            font-size: 0.8rem;
            color: #718096;
            text-decoration: line-through;
            margin-right: 8px;
        }

        /* 板块 10: 成功案例与项目交付 (Client Case Stories) */
        .case-showcase {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 40px;
            align-items: center;
            background: #fff;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .case-image {
            height: 100%;
            min-height: 380px;
        }
        .case-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .case-content {
            padding: 40px;
        }
        .case-tag {
            font-size: 0.8rem;
            background: rgba(0, 102, 255, 0.08);
            color: var(--accent-blue);
            padding: 4px 10px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            display: inline-block;
            margin-bottom: 12px;
        }
        .case-content h3 {
            font-size: 1.5rem;
            color: var(--text-heading);
            margin-bottom: 14px;
        }
        .case-content p {
            font-size: 0.95rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 20px;
        }
        .case-results-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .case-results-list li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.92rem;
            color: var(--text-heading);
            font-weight: 500;
        }
        .case-results-list li i {
            color: #10B981;
        }

        /* 板块 11: 汽车零部件前沿资讯 (Industry Insights) */
        .insights-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 26px;
        }
        .insight-card {
            background: #fff;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }
        .insight-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        .insight-img {
            height: 170px;
        }
        .insight-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .insight-body {
            padding: 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .insight-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 8px;
            display: flex;
            justify-content: space-between;
        }
        .insight-body h3 {
            font-size: 1.15rem;
            color: var(--text-heading);
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .insight-body p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 板块 12: 常见问题手风琴 (FAQ Accordion) */
        .faq-wrapper {
            max-width: 860px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color 0.2s ease;
        }
        .faq-item.active {
            border-color: var(--accent-orange);
        }
        .faq-header {
            padding: 20px 24px;
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-heading);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }
        .faq-header i {
            color: var(--text-muted);
            transition: transform 0.3s ease;
        }
        .faq-item.active .faq-header i {
            transform: rotate(180deg);
            color: var(--accent-orange);
        }
        .faq-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            background: #FAFAFA;
        }
        .faq-item.active .faq-content {
            max-height: 250px;
            padding: 0 24px 20px;
        }
        .faq-content p {
            font-size: 0.92rem;
            color: var(--text-body);
            line-height: 1.7;
        }

        /* 板块 13: 询盘与转化表单 (Conversion & CTA) */
        .conversion-wrapper {
            background: linear-gradient(135deg, #181C23 0%, #202630 100%);
            border-radius: var(--radius-lg);
            padding: 50px;
            border: 1px solid rgba(255, 255, 255, 0.1);
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 50px;
            align-items: center;
        }
        .conversion-info h2 {
            font-size: 2.2rem;
            color: #fff;
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .conversion-info p {
            color: #A0AEC0;
            font-size: 1rem;
            line-height: 1.7;
            margin-bottom: 30px;
        }
        .hotline-card {
            display: flex;
            align-items: center;
            gap: 16px;
            background: rgba(255, 255, 255, 0.05);
            padding: 16px 20px;
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .hotline-icon {
            font-size: 1.8rem;
            color: var(--accent-orange);
        }
        .hotline-text span {
            font-size: 0.8rem;
            color: #A0AEC0;
            display: block;
        }
        .hotline-text strong {
            font-size: 1.3rem;
            color: #fff;
        }
        .inquiry-form {
            background: #fff;
            padding: 32px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-lg);
        }
        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-bottom: 16px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .form-group.full {
            grid-column: 1 / -1;
        }
        .form-group label {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-heading);
        }
        .form-group input,
        .form-group select,
        .form-group textarea {
            padding: 10px 14px;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            font-size: 0.9rem;
            color: var(--text-heading);
            outline: none;
            transition: border-color 0.2s ease;
            background: #fff;
        }
        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            border-color: var(--accent-orange);
        }
        .form-group textarea {
            resize: vertical;
            min-height: 80px;
        }
        .btn-submit {
            width: 100%;
            background: var(--accent-orange);
            color: #fff;
            border: none;
            padding: 12px;
            font-size: 1rem;
            font-weight: 700;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: background 0.2s ease;
        }
        .btn-submit:hover {
            background: var(--accent-orange-hover);
        }

        /* 页脚 */
        .site-footer {
            background: #0D0F12;
            color: #718096;
            padding: 70px 0 30px;
            font-size: 0.9rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1.2fr 1.4fr;
            gap: 40px;
            margin-bottom: 50px;
        }
        .footer-brand h4 {
            color: #fff;
            font-size: 1.3rem;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-brand p {
            font-size: 0.88rem;
            line-height: 1.7;
            color: #A0AEC0;
        }
        .footer-col h5 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 18px;
            font-weight: 700;
            position: relative;
            padding-bottom: 8px;
        }
        .footer-col h5::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 24px;
            height: 2px;
            background: var(--accent-orange);
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            color: #A0AEC0;
            transition: color 0.2s ease;
        }
        .footer-links a:hover {
            color: var(--accent-orange);
        }
        .footer-contact {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-contact li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            color: #A0AEC0;
        }
        .footer-contact i {
            color: var(--accent-orange);
            margin-top: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.8rem;
            color: #4A5568;
        }
        .footer-bottom a {
            color: #718096;
        }
        .footer-bottom a:hover {
            color: #CBD5E0;
        }

        /* 响应式断点 */
        @media (max-width: 1024px) {
            .hero-icon-matrix,
            .scenarios-grid,
            .metrics-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .product-grid,
            .advantage-grid,
            .insights-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-flow {
                grid-template-columns: repeat(3, 1fr);
            }
            .process-flow::before {
                display: none;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .capability-split,
            .quality-section-inner,
            .dark-milestone-grid,
            .conversion-wrapper,
            .case-showcase {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .top-bar {
                display: none;
            }
            .mobile-menu-btn {
                display: block;
            }
            .nav-links {
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                padding: 20px;
                border-bottom: 1px solid var(--border-light);
                box-shadow: var(--shadow-md);
                display: none;
                gap: 16px;
            }
            .nav-links.active {
                display: flex;
            }
            .nav-action .btn-primary {
                display: none;
            }
            .hero-title {
                font-size: 2rem;
            }
            .hero-icon-matrix,
            .scenarios-grid,
            .metrics-grid,
            .product-grid,
            .advantage-grid,
            .insights-grid,
            .process-flow {
                grid-template-columns: 1fr;
            }
            .form-grid {
                grid-template-columns: 1fr;
            }
            .conversion-wrapper {
                padding: 24px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 12px;
                text-align: center;
            }
            section {
                padding: 60px 0;
            }
        }