:root {
      --primary-cyan: #0d9488;
      --primary-dark: #0f766e;
      --primary-light: #ccfbf1;
      --accent-teal: #14b8a6;
      --accent-blue: #0284c7;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f0fdfa;
      --text-main: #0f172a;
      --text-muted: #334155;
      --text-sub: #64748b;
      --border-color: #e2e8f0;
      --border-cyan: #99f6e4;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(13, 148, 136, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(15, 118, 110, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --radius-full: 9999px;
      --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-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    /* 统一居中容器体系 */
    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      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-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .brand-logo-wrap {
      width: 130px;
      display: flex;
      align-items: center;
    }

    .brand-badge {
      display: inline-block;
      font-size: 0.75rem;
      background: var(--primary-light);
      color: var(--primary-dark);
      padding: 3px 8px;
      border-radius: var(--radius-full);
      font-weight: 600;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      text-decoration: none;
      color: var(--text-muted);
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      display: inline-block;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary-dark);
      background: var(--bg-alt);
    }

    .nav-action {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
      line-height: 1.4;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--accent-blue) 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(13, 148, 136, 0.25);
    }

    .btn-primary:hover {
      box-shadow: 0 6px 18px rgba(13, 148, 136, 0.4);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--primary-dark);
      border-color: var(--border-cyan);
    }

    .btn-outline:hover {
      background: var(--bg-alt);
      border-color: var(--primary-cyan);
      transform: translateY(-2px);
    }

    .btn-lg {
      padding: 14px 32px;
      font-size: 1.05rem;
      border-radius: var(--radius-md);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 6px 10px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 首屏 Hero（无图片，纯科技渐变与卡片排版） */
    .hero-section {
      background: linear-gradient(180deg, #f0fdfa 0%, #f8fafc 100%);
      border-bottom: 1px solid var(--border-color);
      padding: 80px 0 60px;
      position: relative;
    }

    .hero-wrapper {
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid var(--border-cyan);
      padding: 6px 16px;
      border-radius: var(--radius-full);
      color: var(--primary-dark);
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      line-height: 1.25;
      color: #042f2e;
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-btn-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }

    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-md);
      padding: 22px 18px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .metric-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-cyan);
      margin-bottom: 6px;
      display: block;
    }

    .metric-desc {
      font-size: 0.875rem;
      color: var(--text-sub);
      font-weight: 500;
    }

    /* 区域公用样式 */
    .section {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .section-alt {
      background-color: #f6fcfb;
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 50px;
    }

    .section-tag {
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--primary-cyan);
      background: var(--primary-light);
      padding: 4px 12px;
      border-radius: var(--radius-full);
      display: inline-block;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: #042f2e;
      line-height: 1.3;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 模型矩阵徽章墙 */
    .model-badge-wall {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 30px;
    }

    .model-badge {
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--text-muted);
      padding: 6px 14px;
      border-radius: var(--radius-full);
      font-size: 0.85rem;
      font-weight: 600;
      box-shadow: 0 1px 2px rgba(0,0,0,0.03);
      transition: var(--transition);
    }

    .model-badge:hover {
      border-color: var(--primary-cyan);
      color: var(--primary-dark);
      background: var(--bg-alt);
      transform: translateY(-2px);
    }

    /* 卡片网格系统 */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .feature-card:hover {
      border-color: var(--border-cyan);
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      color: var(--primary-dark);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: bold;
      margin-bottom: 18px;
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: #042f2e;
      margin-bottom: 10px;
    }

    .card-text {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 流程步骤 */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }

    .step-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent-teal);
      line-height: 1;
      margin-bottom: 12px;
      opacity: 0.8;
    }

    /* 对比表格 */
    .comparison-table-wrap {
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .comparison-table th,
    .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .comparison-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    .comparison-table th.highlight,
    .comparison-table td.highlight {
      background: #f0fdfa;
      color: var(--primary-dark);
      font-weight: 600;
      border-left: 2px solid var(--primary-cyan);
      border-right: 2px solid var(--primary-cyan);
    }

    .rating-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #fef3c7;
      color: #92400e;
      padding: 6px 14px;
      border-radius: var(--radius-full);
      font-weight: 700;
      font-size: 0.95rem;
    }

    /* 案例展示区图片容器规范 */
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #e2e8f0;
      overflow: hidden;
    }

    .case-img-wrap.square {
      aspect-ratio: 1 / 1;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .case-content {
      padding: 20px;
    }

    /* 评论卡片 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .avatar-char {
      width: 40px;
      height: 40px;
      border-radius: var(--radius-full);
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .author-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-info p {
      font-size: 0.8rem;
      color: var(--text-sub);
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item:hover {
      border-color: var(--border-cyan);
    }

    .faq-question {
      padding: 18px 22px;
      font-weight: 700;
      color: #042f2e;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }

    .faq-question::after {
      content: '+';
      font-size: 1.4rem;
      color: var(--primary-cyan);
      transition: transform 0.25s ease;
    }

    .faq-item.active .faq-question::after {
      content: '−';
    }

    .faq-answer {
      display: none;
      padding: 0 22px 18px;
      color: var(--text-muted);
      font-size: 0.925rem;
      line-height: 1.6;
      border-top: 1px solid #f8fafc;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 表单区域与联系 */
    .contact-form-card {
      background: #ffffff;
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background: #fdfdfd;
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary-cyan);
      box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
      background: #ffffff;
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* 文章列表外链区 */
    .article-links-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 30px;
    }

    .article-link-item {
      display: block;
      padding: 10px 0;
      border-bottom: 1px dashed var(--border-color);
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.95rem;
      transition: var(--transition);
    }

    .article-link-item:last-child {
      border-bottom: none;
    }

    .article-link-item:hover {
      color: var(--primary-cyan);
      padding-left: 6px;
    }

    /* 页脚 */
    .site-footer {
      background: #042f2e;
      color: #99f6e4;
      padding: 60px 0 30px;
      border-top: 1px solid #115e59;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-brand h3 {
      color: #ffffff;
      font-size: 1.3rem;
      margin-bottom: 14px;
    }

    .footer-brand p {
      color: #ccfbf1;
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 18px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 16px;
      font-weight: 700;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      color: #ccfbf1;
      text-decoration: none;
      font-size: 0.9rem;
      transition: var(--transition);
    }

    .footer-links a:hover {
      color: #ffffff;
      text-decoration: underline;
    }

    .footer-qr-wrap {
      width: 110px;
      background: #ffffff;
      padding: 6px;
      border-radius: var(--radius-sm);
      margin-top: 10px;
    }

    .footer-qr-wrap img {
      width: 100%;
      height: auto;
      display: block;
    }

    .footer-bottom {
      border-top: 1px solid #134e4a;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #5eead4;
    }

    .friend-links-bar {
      margin-bottom: 16px;
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
    }

    .friend-links-bar a {
      color: #99f6e4;
      text-decoration: none;
      font-size: 0.85rem;
    }

    .friend-links-bar a:hover {
      color: #ffffff;
    }

    /* 悬浮客服挂件 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-full);
      background: var(--primary-cyan);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      text-decoration: none;
      cursor: pointer;
      font-size: 1.1rem;
      font-weight: bold;
      border: 2px solid #ffffff;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary-dark);
      transform: scale(1.08);
    }

    .float-qr-pop {
      position: absolute;
      right: 60px;
      bottom: 0;
      width: 160px;
      background: #ffffff;
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-md);
      padding: 12px;
      box-shadow: var(--shadow-lg);
      display: none;
      text-align: center;
    }

    .float-qr-pop p {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-top: 6px;
    }

    .floating-widget:hover .float-qr-pop {
      display: block;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title { font-size: 2rem; }
      .hero-metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-2 { grid-template-columns: 1fr; }
      .step-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
      }
      .nav-links.show {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title { font-size: 1.7rem; }
      .hero-subtitle { font-size: 1rem; }
      .hero-metrics-grid { grid-template-columns: 1fr; }
      .grid-3, .grid-4, .step-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .section { padding: 50px 0; }
    }