/* roulang page: index */
:root {
      --primary: #0A2540;
      --primary-light: #16385d;
      --accent: #FF5A1F;
      --accent-hover: #e04a14;
      --text-dark: #1E293B;
      --text-muted: #4A5568;
      --text-light: #94A3B8;
      --bg-light: #F8FAFC;
      --bg-dark: #0B1320;
      --bg-card: #FFFFFF;
      --border-color: #E2E8F0;
      --status-green: #00D084;
      --font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 6px 16px -2px rgba(10,37,64,0.08);
      --shadow-lg: 0 16px 32px -4px rgba(10,37,64,0.12);
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-family: var(--font-family);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.65;
    }

    body {
      overflow-x: hidden;
    }

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

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

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部通栏信息 */
    .top-bar {
      background: #061626;
      color: #94A3B8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-badges span {
      display: inline-flex;
      align-items: center;
      margin-right: 18px;
    }
    .top-bar-badges span::before {
      content: "";
      width: 6px;
      height: 6px;
      background: var(--status-green);
      border-radius: 50%;
      margin-right: 6px;
    }

    /* 主导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.02em;
    }
    .brand-logo .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--accent), #ff7d4d);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 18px;
      font-weight: 900;
    }
    .brand-logo span {
      color: var(--accent);
    }
    .nav-menu {
      display: flex;
      list-style: none;
      gap: 28px;
      align-items: center;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-dark);
      padding: 6px 0;
      position: relative;
    }
    .nav-link:hover {
      color: var(--accent);
    }
    .nav-link::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: var(--transition);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .nav-cta-btn {
      background: var(--accent);
      color: #FFFFFF;
      padding: 10px 22px;
      border-radius: 6px;
      font-size: 14px;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(255, 90, 31, 0.25);
    }
    .nav-cta-btn:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }

    /* Section 公用样式 */
    .section {
      padding: 88px 0;
      position: relative;
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: #FFFFFF;
    }
    .section-title-wrap {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 52px;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(255, 90, 31, 0.1);
      color: var(--accent);
      font-size: 13px;
      font-weight: 700;
      border-radius: 20px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }
    .section-dark .section-badge {
      background: rgba(255, 90, 31, 0.2);
    }
    .section-h2 {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-dark .section-h2 {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .section-dark .section-desc {
      color: var(--text-light);
    }

    /* 1. Hero 区域：自测选型短问卷视觉 */
    .hero-section {
      background: linear-gradient(135deg, rgba(10, 37, 64, 0.95), rgba(15, 23, 42, 0.92)), url('/assets/images/1e214a2aba11c67f.webp') center/cover no-repeat;
      color: #FFFFFF;
      padding: 90px 0 100px;
      position: relative;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 44px;
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }
    .hero-content h1 span {
      color: var(--accent);
    }
    .hero-intro {
      font-size: 16px;
      color: #CBD5E1;
      line-height: 1.75;
      margin-bottom: 32px;
    }
    .hero-stats {
      display: flex;
      gap: 32px;
      margin-top: 24px;
      border-top: 1px solid rgba(255,255,255,0.15);
      padding-top: 24px;
    }
    .hero-stat-item b {
      font-size: 26px;
      color: #FFFFFF;
      font-weight: 800;
      display: block;
    }
    .hero-stat-item span {
      font-size: 13px;
      color: var(--text-light);
    }
    
    /* 选型问卷卡片 */
    .hero-eval-card {
      background: #FFFFFF;
      border-radius: 16px;
      padding: 32px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      color: var(--text-dark);
    }
    .eval-card-header {
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 16px;
      margin-bottom: 20px;
    }
    .eval-card-header h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
    }
    .eval-card-header p {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 4px;
    }
    .eval-step-group {
      margin-bottom: 16px;
    }
    .eval-step-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-dark);
    }
    .eval-options-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 8px;
    }
    .eval-option {
      border: 1px solid var(--border-color);
      padding: 8px 6px;
      text-align: center;
      border-radius: 6px;
      font-size: 12px;
      cursor: pointer;
      transition: var(--transition);
      background: var(--bg-light);
    }
    .eval-option.active, .eval-option:hover {
      border-color: var(--accent);
      background: rgba(255,90,31,0.06);
      color: var(--accent);
      font-weight: 600;
    }
    .eval-preview-box {
      background: #F1F5F9;
      border-radius: 8px;
      padding: 12px;
      margin: 20px 0;
      font-size: 12px;
      color: var(--text-muted);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .eval-preview-box b {
      color: var(--primary);
    }
    .eval-submit-btn {
      width: 100%;
      background: var(--accent);
      color: #FFFFFF;
      border: none;
      padding: 14px;
      border-radius: 8px;
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(255, 90, 31, 0.35);
      transition: var(--transition);
    }
    .eval-submit-btn:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }

    /* 2. 功能亮点 (六维研发优势) */
    .grid-3col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(255, 90, 31, 0.4);
    }
    .feature-icon-wrapper {
      width: 48px;
      height: 48px;
      background: rgba(10, 37, 64, 0.05);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 3. 场景矩阵 (服务范围/成果展) */
    .product-card {
      background: #FFFFFF;
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .product-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .product-thumb {
      height: 200px;
      overflow: hidden;
      background: #E2E8F0;
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .product-card:hover .product-thumb img {
      transform: scale(1.05);
    }
    .product-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .product-tags {
      display: flex;
      gap: 6px;
      margin-bottom: 12px;
      flex-wrap: wrap;
    }
    .tag-badge {
      background: #EDF2F7;
      color: var(--text-muted);
      font-size: 11px;
      padding: 3px 8px;
      border-radius: 4px;
      font-weight: 600;
    }
    .product-body h3 {
      font-size: 17px;
      color: var(--primary);
      margin-bottom: 10px;
    }
    .product-body p {
      font-size: 13.5px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
      flex: 1;
    }
    .product-footer {
      border-top: 1px solid #F1F5F9;
      padding-top: 14px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .product-cycle {
      font-size: 12px;
      color: var(--accent);
      font-weight: 600;
    }
    .btn-text-action {
      font-size: 13px;
      color: var(--primary);
      font-weight: 700;
    }
    .btn-text-action:hover {
      color: var(--accent);
    }

    /* 4. 平台架构与前沿材料实验室 */
    .lab-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .lab-img-frame {
      border-radius: 14px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.1);
      box-shadow: 0 16px 36px rgba(0,0,0,0.4);
    }
    .lab-metrics-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 24px;
    }
    .lab-metric-box {
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.08);
      padding: 16px;
      border-radius: 8px;
    }
    .lab-metric-box h4 {
      font-size: 13px;
      color: var(--text-light);
      margin-bottom: 6px;
    }
    .lab-metric-box .metric-value {
      font-size: 20px;
      font-weight: 800;
      color: var(--status-green);
    }

    /* 5. 研发流程方案 (横向步骤轴) */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }
    .process-step {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 24px 16px;
      text-align: center;
      position: relative;
    }
    .step-num {
      width: 32px;
      height: 32px;
      background: var(--primary);
      color: #FFFFFF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      font-weight: 800;
      margin: 0 auto 14px;
    }
    .process-step h4 {
      font-size: 15px;
      color: var(--primary);
      margin-bottom: 8px;
      font-weight: 700;
    }
    .process-step p {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 6. 截图与演示 (测试验证中心) */
    .testing-split {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
      background: #FFFFFF;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      overflow: hidden;
    }
    .testing-info {
      padding: 40px;
    }
    .testing-info h3 {
      font-size: 24px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .testing-info p {
      font-size: 14.5px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .testing-checklist {
      list-style: none;
    }
    .testing-checklist li {
      font-size: 13.5px;
      color: var(--text-dark);
      margin-bottom: 10px;
      display: flex;
      align-items: center;
    }
    .testing-checklist li::before {
      content: "✓";
      color: var(--status-green);
      font-weight: 900;
      margin-right: 10px;
    }
    .testing-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* 7. 指标数据条 */
    .metrics-bar-section {
      background: var(--primary);
      color: #FFFFFF;
      padding: 48px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-number {
      font-size: 38px;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .metric-label {
      font-size: 14px;
      color: #CBD5E1;
    }

    /* 8. 客户与专家评价 */
    .testimonial-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }
    .testimonial-rating {
      color: #FFB800;
      font-size: 14px;
      margin-bottom: 14px;
    }
    .testimonial-text {
      font-size: 14px;
      color: var(--text-dark);
      line-height: 1.65;
      margin-bottom: 20px;
      font-style: italic;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: var(--primary);
      font-size: 14px;
    }
    .author-meta h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--primary);
    }
    .author-meta span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 9. 研发服务阶梯与套餐对比 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      align-items: stretch;
    }
    .pricing-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 36px 28px;
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .pricing-card.featured {
      border: 2px solid var(--accent);
      box-shadow: var(--shadow-lg);
    }
    .featured-tag {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--accent);
      color: #FFFFFF;
      font-size: 12px;
      font-weight: 700;
      padding: 2px 14px;
      border-radius: 20px;
    }
    .pricing-card h3 {
      font-size: 20px;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .pricing-card p {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 24px;
    }
    .pricing-list {
      list-style: none;
      margin-bottom: 32px;
      flex: 1;
    }
    .pricing-list li {
      font-size: 13.5px;
      color: var(--text-dark);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
    }
    .pricing-list li::before {
      content: "•";
      color: var(--accent);
      font-size: 18px;
      margin-right: 8px;
    }
    .pricing-btn {
      display: block;
      text-align: center;
      padding: 12px;
      border-radius: 6px;
      font-size: 14px;
      font-weight: 700;
      border: 1px solid var(--primary);
      color: var(--primary);
    }
    .pricing-card.featured .pricing-btn {
      background: var(--accent);
      border-color: var(--accent);
      color: #FFFFFF;
    }
    .pricing-btn:hover {
      background: var(--primary);
      color: #FFFFFF;
    }

    /* 10. 行业资讯与技术洞察 */
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .insight-item {
      background: #FFFFFF;
      border-radius: 10px;
      border: 1px solid var(--border-color);
      overflow: hidden;
    }
    .insight-img {
      height: 160px;
      overflow: hidden;
    }
    .insight-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .insight-body {
      padding: 20px;
    }
    .insight-date {
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 6px;
    }
    .insight-body h4 {
      font-size: 16px;
      color: var(--primary);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .insight-body p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 11. 常见问题 FAQ */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 14px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 15px;
      font-weight: 700;
      color: var(--primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFFFFF;
    }
    .faq-question::after {
      content: "+";
      font-size: 20px;
      color: var(--accent);
      font-weight: 700;
    }
    .faq-answer {
      padding: 0 24px 18px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 12. 下载引导与工程立项 CTA */
    .cta-box {
      background: linear-gradient(135deg, #0A2540 0%, #16385D 100%);
      border-radius: 20px;
      padding: 56px;
      color: #FFFFFF;
    }
    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .cta-text h2 {
      font-size: 32px;
      font-weight: 800;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .cta-text p {
      font-size: 15px;
      color: #CBD5E1;
      line-height: 1.7;
      margin-bottom: 28px;
    }
    .cta-form {
      background: #FFFFFF;
      padding: 32px;
      border-radius: 12px;
      color: var(--text-dark);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 14px;
    }
    .form-submit-btn {
      width: 100%;
      background: var(--accent);
      color: #FFFFFF;
      border: none;
      padding: 12px;
      border-radius: 6px;
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      transition: var(--transition);
    }
    .form-submit-btn:hover {
      background: var(--accent-hover);
    }

    /* 页脚 */
    .site-footer {
      background: #06111C;
      color: #94A3B8;
      padding: 64px 0 32px;
      border-top: 1px solid rgba(255,255,255,0.06);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-brand h3 {
      color: #FFFFFF;
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 14px;
    }
    .footer-brand p {
      font-size: 13.5px;
      line-height: 1.7;
      color: #64748B;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      font-size: 13px;
      color: #94A3B8;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12.5px;
    }

    /* 响应式断点适配 */
    @media (max-width: 1024px) {
      .hero-grid, .lab-grid, .testing-split, .cta-grid {
        grid-template-columns: 1fr;
      }
      .grid-3col, .pricing-grid, .insights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(3, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-bar { display: none; }
      .nav-menu { display: none; }
      .grid-3col, .pricing-grid, .insights-grid {
        grid-template-columns: 1fr;
      }
      .process-timeline {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
      }
      .hero-content h1 {
        font-size: 32px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
      .cta-box {
        padding: 32px 20px;
      }
    }