/* roulang page: index */
:root {
      --primary: #0F141C;
      --secondary: #059669;
      --secondary-hover: #10B981;
      --bg-page: #F8FAFC;
      --bg-card: #FFFFFF;
      --bg-dark: #090D14;
      --border: #E2E8F0;
      --border-dark: #1E293B;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --radius: 4px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --transition: 200ms cubic-bezier(0.16, 1, 0.3, 1);
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      font-size: 15px;
      line-height: 1.6;
      color: var(--text-main);
      background-color: var(--bg-page);
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input, select, textarea {
      font: inherit;
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    .mono {
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      font-variant-numeric: tabular-nums;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 10px;
      font-size: 12px;
      font-weight: 500;
      border-radius: var(--radius);
      background: rgba(5, 150, 105, 0.1);
      color: var(--secondary);
      border: 1px solid rgba(5, 150, 105, 0.2);
    }
    .badge-dark {
      background: rgba(255, 255, 255, 0.08);
      color: #94A3B8;
      border-color: rgba(255, 255, 255, 0.12);
    }
    .status-dot {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: var(--secondary);
      box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.25);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 24px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--secondary);
      color: #FFFFFF;
      border-color: var(--secondary);
    }
    .btn-primary:hover {
      background: var(--secondary-hover);
      transform: translateY(-2px);
      box-shadow: var(--shadow-sm);
    }
    .btn-outline {
      background: #FFFFFF;
      color: var(--text-main);
      border-color: var(--border);
    }
    .btn-outline:hover {
      border-color: var(--text-main);
      transform: translateY(-2px);
    }
    .btn-dark {
      background: var(--primary);
      color: #FFFFFF;
      border-color: var(--primary);
    }
    .btn-dark:hover {
      background: #1E293B;
      transform: translateY(-2px);
    }

    /* 顶部 Meta 栏 */
    .top-meta-bar {
      height: 36px;
      background: var(--primary);
      color: #94A3B8;
      font-size: 12px;
      border-bottom: 1px solid #1E293B;
      display: flex;
      align-items: center;
    }
    .top-meta-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .top-meta-left, .top-meta-right {
      display: flex;
      align-items: center;
      gap: 18px;
    }

    /* 主导航 */
    .main-nav-bar {
      height: 72px;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border);
      position: sticky;
      top: 0;
      z-index: 100;
    }
    .nav-container {
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--primary);
    }
    .brand-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: var(--radius);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFFFFF;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-link {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      transition: var(--transition);
      position: relative;
    }
    .nav-link:hover {
      color: var(--secondary);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--border);
      padding: 8px 12px;
      border-radius: var(--radius);
      cursor: pointer;
    }

    /* 板块通用 */
    section {
      padding: 88px 0;
      border-bottom: 1px solid var(--border);
    }
    .section-head {
      margin-bottom: 48px;
      max-width: 760px;
    }
    .section-head.center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }
    .section-title {
      font-size: 32px;
      font-weight: 600;
      letter-spacing: -0.02em;
      line-height: 1.3;
      margin-top: 12px;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .section-desc {
      font-size: 16px;
      line-height: 1.6;
      color: var(--text-muted);
    }

    /* 板块 1: Hero 堆叠首屏 */
    .hero-section {
      position: relative;
      background-color: #F1F5F9;
      background-image: linear-gradient(to bottom, rgba(248, 250, 252, 0.88), rgba(241, 245, 249, 0.96)), url('/assets/images/3dee9634df59ba7f.webp');
      background-size: cover;
      background-position: center;
      padding: 80px 0 100px;
      overflow: hidden;
    }
    .hero-stack-wrap {
      display: grid;
      grid-template-columns: 1.25fr 0.75fr;
      gap: 32px;
      align-items: center;
      position: relative;
    }
    .hero-main-card {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 48px 44px;
      box-shadow: var(--shadow-sm);
      z-index: 2;
    }
    .hero-title {
      font-size: 44px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin: 18px 0;
      color: var(--primary);
    }
    .hero-p {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-side-stack {
      position: relative;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .stack-card {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .stack-card:hover {
      border-color: var(--secondary);
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }
    .stack-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid var(--border);
      padding-bottom: 12px;
      margin-bottom: 16px;
    }
    .data-row {
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      padding: 7px 0;
      border-bottom: 1px dashed #F1F5F9;
    }
    .data-row:last-child {
      border-bottom: none;
    }

    /* 板块 2: 指标看板（#dashboard） */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .dashboard-item {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      transition: var(--transition);
    }
    .dashboard-item:hover {
      border-color: var(--secondary);
      transform: translateY(-2px);
    }
    .dash-val {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary);
      margin: 10px 0 4px;
    }
    .dash-label {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 板块 3: 服务矩阵（#matrix） */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      border-top: 1px solid var(--border);
      border-left: 1px solid var(--border);
    }
    .matrix-box {
      border-right: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
      padding: 36px 28px;
      background: #FFFFFF;
      transition: var(--transition);
    }
    .matrix-box:hover {
      background: #F8FAFC;
    }
    .matrix-num {
      font-size: 13px;
      color: var(--secondary);
      font-weight: 700;
      margin-bottom: 16px;
    }
    .matrix-h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--primary);
    }
    .matrix-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 4: 结果数据对比条 */
    .dark-strip {
      background: var(--primary);
      color: #FFFFFF;
      padding: 56px 0;
      border-bottom: 1px solid #1E293B;
    }
    .strip-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .strip-item {
      padding: 0 16px;
      border-right: 1px solid rgba(255, 255, 255, 0.1);
    }
    .strip-item:last-child {
      border-right: none;
    }
    .strip-num {
      font-size: 36px;
      font-weight: 700;
      color: var(--secondary-hover);
      margin-bottom: 8px;
    }
    .strip-sub {
      font-size: 13px;
      color: #94A3B8;
    }

    /* 板块 5: 核心元器件（#products） */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .product-card {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
      transition: var(--transition);
    }
    .product-card:hover {
      border-color: var(--secondary);
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }
    .product-thumb {
      height: 200px;
      background: #0F172A;
      overflow: hidden;
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .product-card:hover .product-thumb img {
      transform: scale(1.05);
    }
    .product-body {
      padding: 24px;
    }
    .product-h3 {
      font-size: 18px;
      font-weight: 600;
      margin: 8px 0 12px;
      color: var(--primary);
    }
    .product-param-table {
      width: 100%;
      border-collapse: collapse;
      margin: 16px 0;
      font-size: 13px;
    }
    .product-param-table td {
      padding: 6px 0;
      border-bottom: 1px solid #F1F5F9;
      color: var(--text-muted);
    }
    .product-param-table td:last-child {
      text-align: right;
      color: var(--primary);
      font-weight: 500;
    }

    /* 板块 6: 质量检测实验室（#assurance） */
    .assurance-section {
      background: var(--bg-dark);
      color: #FFFFFF;
      border-bottom: 1px solid var(--border-dark);
    }
    .assurance-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .assurance-step {
      display: flex;
      gap: 16px;
      margin-bottom: 24px;
    }
    .step-badge {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: rgba(16, 185, 129, 0.15);
      border: 1px solid var(--secondary);
      color: var(--secondary-hover);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
      flex-shrink: 0;
    }
    .step-content h4 {
      font-size: 16px;
      font-weight: 600;
      color: #F8FAFC;
      margin-bottom: 4px;
    }
    .step-content p {
      font-size: 14px;
      color: #94A3B8;
      line-height: 1.5;
    }

    /* 板块 7: 采销履约对比表格 */
    .compare-table {
      width: 100%;
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-collapse: collapse;
      border-radius: var(--radius);
      overflow: hidden;
    }
    .compare-table th, .compare-table td {
      padding: 18px 24px;
      text-align: left;
      font-size: 14px;
      border-bottom: 1px solid var(--border);
    }
    .compare-table th {
      background: #F8FAFC;
      font-weight: 600;
      color: var(--primary);
    }
    .compare-table td.highlight {
      background: rgba(5, 150, 105, 0.04);
      color: var(--secondary);
      font-weight: 600;
    }

    /* 板块 8: 履约里程碑步进轴 */
    .timeline-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      position: relative;
      gap: 16px;
    }
    .timeline-grid::before {
      content: "";
      position: absolute;
      top: 24px;
      left: 30px;
      right: 30px;
      height: 2px;
      background: var(--border);
      z-index: 0;
    }
    .timeline-node {
      position: relative;
      background: #FFFFFF;
      padding: 24px 20px;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      z-index: 1;
      text-align: center;
    }
    .node-dot {
      width: 32px;
      height: 32px;
      margin: 0 auto 16px;
      border-radius: 50%;
      background: #FFFFFF;
      border: 2px solid var(--secondary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 13px;
      color: var(--secondary);
    }
    .node-title {
      font-size: 15px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .node-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 板块 9: 产业协同案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-card {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 36px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .case-client-tag {
      font-size: 12px;
      font-weight: 600;
      text-transform: uppercase;
      color: var(--secondary);
      margin-bottom: 12px;
    }
    .case-quote {
      font-size: 16px;
      line-height: 1.6;
      color: var(--primary);
      margin-bottom: 24px;
    }
    .case-meta {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-top: 1px solid var(--border);
      padding-top: 16px;
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 板块 10: 行业情报资讯（#intelligence） */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }
    .news-card:hover {
      border-color: var(--secondary);
      transform: translateY(-2px);
    }
    .news-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 12px;
    }
    .news-title {
      font-size: 17px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .news-summary {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }

    /* 板块 11: 疑难解答 FAQ（#faq） */
    .faq-container {
      max-width: 820px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 24px;
      background: none;
      border: none;
      font-size: 16px;
      font-weight: 600;
      color: var(--primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-arrow {
      font-size: 18px;
      color: var(--text-muted);
      transition: var(--transition);
    }
    .faq-answer {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(45deg);
      color: var(--secondary);
    }

    /* 板块 12: 需求匹配与联络表单（#contact） */
    .contact-card-wrap {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .contact-info {
      background: var(--primary);
      color: #FFFFFF;
      padding: 48px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .contact-form-pane {
      padding: 48px;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--secondary);
      box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
    }
    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    /* 页脚 */
    .site-footer {
      background: #090D14;
      color: #94A3B8;
      padding: 72px 0 32px;
      font-size: 13px;
      border-top: 1px solid #1E293B;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 48px;
      margin-bottom: 56px;
    }
    .footer-col h5 {
      color: #FFFFFF;
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 12px;
    }
    .footer-links a {
      color: #94A3B8;
      transition: var(--transition);
    }
    .footer-links a:hover {
      color: var(--secondary-hover);
    }
    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 32px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-stack-wrap {
        grid-template-columns: 1fr;
      }
      .dashboard-grid, .matrix-grid, .strip-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .products-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline-grid {
        grid-template-columns: 1fr;
      }
      .timeline-grid::before {
        display: none;
      }
      .cases-grid {
        grid-template-columns: 1fr;
      }
      .contact-card-wrap {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .top-meta-bar {
        display: none;
      }
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        bottom: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 32px 24px;
        gap: 20px;
        align-items: flex-start;
        display: none;
        border-top: 1px solid var(--border);
      }
      .nav-menu.show {
        display: flex;
      }
      .mobile-menu-btn {
        display: inline-flex;
      }
      .hero-title {
        font-size: 32px;
      }
      .dashboard-grid, .matrix-grid, .strip-grid, .products-grid, .news-grid {
        grid-template-columns: 1fr;
      }
      .assurance-wrap {
        grid-template-columns: 1fr;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }