:root {
      --primary: #059669;
      --primary-hover: #047857;
      --primary-light: #ecfdf5;
      --primary-mint: #10b981;
      --primary-soft: #d1fae5;
      --accent: #0284c7;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --border-mint: #a7f3d0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(16, 185, 129, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --container-max: 1200px;
      --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: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background-color: var(--bg-page);
      color: var(--text-main);
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .brand-box .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .brand-title-wrap {
      display: flex;
      flex-direction: column;
    }

    .brand-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--primary-hover);
      line-height: 1.2;
    }

    .brand-subtitle {
      font-size: 0.75rem;
      color: var(--text-light);
    }

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

    .nav-links li a,
    .nav-links li .ai-page-home-link {
      display: block;
      padding: 8px 14px;
      font-size: 0.92rem;
      color: var(--text-muted);
      font-weight: 500;
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover,
    .nav-links li .ai-page-home-link:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.92rem;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 2px 8px rgba(16, 185, 129, 0.35);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.45);
      transform: translateY(-1px);
    }

    .btn-outline {
      background-color: var(--bg-surface);
      border-color: var(--primary-mint);
      color: var(--primary);
    }

    .btn-outline:hover {
      background-color: var(--primary-light);
      border-color: var(--primary);
    }

    .btn-sm {
      padding: 6px 14px;
      font-size: 0.85rem;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
      color: var(--text-main);
    }

    /* 首屏 Hero (严格无图片) */
    .hero-section {
      padding: 70px 0 60px;
      background: linear-gradient(180deg, #ecfdf5 0%, #f0fdf4 45%, #f8fafc 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-wrap {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      background: #d1fae5;
      color: #065f46;
      border: 1px solid var(--border-mint);
      border-radius: var(--radius-full);
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.6rem;
      font-weight: 800;
      color: #064e3b;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 1.12rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 32px;
      max-width: 800px;
    }

    .hero-cta-group {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
      justify-content: center;
      margin-bottom: 40px;
    }

    .hero-cta-official {
      background: #059669;
      color: #ffffff;
      padding: 13px 28px;
      font-size: 1.05rem;
      border-radius: var(--radius-md);
      font-weight: 700;
      box-shadow: 0 4px 14px rgba(5, 150, 105, 0.4);
    }

    .hero-cta-official:hover {
      background: #047857;
      transform: translateY(-2px);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      width: 100%;
      margin-top: 10px;
    }

    .hero-stat-card {
      background: #ffffff;
      padding: 18px 14px;
      border-radius: var(--radius-md);
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-sm);
    }

    .hero-stat-val {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .hero-stat-lbl {
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* 通用Section */
    .section-block {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-block.bg-light {
      background-color: #f1f5f9;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

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

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

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      border-color: var(--border-mint);
      box-shadow: var(--shadow-lg);
      transform: translateY(-3px);
    }

    .card-icon {
      width: 46px;
      height: 46px;
      border-radius: var(--radius-md);
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      margin-bottom: 18px;
      border: 1px solid var(--border-mint);
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .card-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: auto;
    }

    .card-tag {
      font-size: 0.75rem;
      background: #f1f5f9;
      color: var(--text-muted);
      padding: 3px 8px;
      border-radius: var(--radius-sm);
    }

    /* 场景矩阵列表 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
      gap: 20px;
    }

    .scenario-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      transition: var(--transition);
    }

    .scenario-item:hover {
      border-color: var(--primary-mint);
      box-shadow: var(--shadow-md);
    }

    .scenario-head {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 8px;
    }

    .scenario-name {
      font-size: 1.05rem;
      font-weight: 700;
      color: #065f46;
    }

    .scenario-text {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 模型矩阵徽章云 */
    .model-badge-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      padding: 24px;
      background: var(--bg-surface);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
    }

    .model-chip {
      background: var(--primary-light);
      border: 1px solid var(--border-mint);
      color: #065f46;
      font-size: 0.85rem;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: var(--radius-full);
      transition: var(--transition);
    }

    .model-chip:hover {
      background: var(--primary);
      color: #ffffff;
    }

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

    .process-step {
      background: var(--bg-surface);
      padding: 24px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: var(--radius-full);
      background: var(--primary);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 14px;
    }

    .step-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比表格 */
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: var(--bg-surface);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

    .custom-table th,
    .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

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

    .custom-table tr:hover {
      background: #f0fdf4;
    }

    .custom-table td.highlight {
      color: var(--primary);
      font-weight: 700;
    }

    .score-badge-card {
      background: linear-gradient(135deg, #065f46 0%, #059669 100%);
      color: #ffffff;
      padding: 28px;
      border-radius: var(--radius-lg);
      text-align: center;
      margin-bottom: 28px;
      display: flex;
      justify-content: space-around;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    .score-val {
      font-size: 2.4rem;
      font-weight: 800;
      color: #a7f3d0;
    }

    /* 案例展示 */
    .case-banner-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 24px;
    }

    .case-banner-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: var(--bg-surface);
    }

    .case-banner-item img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
    }

    .case-info {
      padding: 16px;
    }

    .case-info h4 {
      font-size: 1.05rem;
      margin-bottom: 6px;
    }

    .case-info p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    .promo-banner-strip {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
      margin-top: 24px;
    }

    .promo-banner-strip .ai-page-image {
      width: 100%;
      height: 140px;
      object-fit: cover;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    /* 用户评论 */
    .testimonial-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-body {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      font-style: italic;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .author-avatar-badge {
      width: 42px;
      height: 42px;
      border-radius: var(--radius-full);
      background: var(--primary-light);
      color: var(--primary);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--border-mint);
    }

    .author-meta h5 {
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .author-meta span {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item.active {
      border-color: var(--primary-mint);
    }

    .faq-question {
      padding: 18px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 1rem;
      color: var(--text-main);
      user-select: none;
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
    }

    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #f8fafc;
    }

    .faq-answer-inner {
      padding: 0 20px 18px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 需求匹配与联系我们表单 */
    .contact-form-layout {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 36px;
      background: var(--bg-surface);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 11px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      font-size: 0.92rem;
      color: var(--text-main);
      background: #f8fafc;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 95px;
    }

    .contact-info-panel {
      background: #f0fdf4;
      border: 1px solid var(--border-mint);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-info-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: #065f46;
    }

    .contact-item {
      display: flex;
      flex-direction: column;
      font-size: 0.9rem;
    }

    .contact-item span {
      color: var(--text-light);
      font-size: 0.8rem;
    }

    .contact-item strong {
      color: var(--text-main);
      font-size: 0.98rem;
    }

    .qr-box {
      text-align: center;
      padding-top: 10px;
    }

    .qr-box img {
      width: 130px;
      height: 130px;
      object-fit: cover;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      margin-bottom: 6px;
    }

    .qr-box p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* 行业资讯与短代码文章 */
    .news-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .news-articles-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
    }

    .news-article-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      margin-top: 14px;
    }

    .news-article-links li a {
      font-size: 0.9rem;
      color: var(--primary-hover);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .news-article-links li a:hover {
      color: var(--primary);
      text-decoration: underline;
    }

    /* 页脚与友情链接 */
    .site-footer {
      background-color: #0f172a;
      color: #cbd5e1;
      padding: 50px 0 24px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 32px;
      margin-bottom: 40px;
    }

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

    .footer-col p {
      font-size: 0.88rem;
      line-height: 1.6;
      color: #94a3b8;
      margin-bottom: 12px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links li a {
      color: #94a3b8;
      font-size: 0.88rem;
    }

    .footer-links li a:hover {
      color: #34d399;
    }

    .friend-links-box {
      border-top: 1px solid #334155;
      padding-top: 20px;
      margin-bottom: 24px;
      font-size: 0.85rem;
    }

    .friend-links-box span {
      color: #ffffff;
      font-weight: 600;
      margin-right: 12px;
      display: inline-block;
      margin-bottom: 8px;
    }

    .friend-links-box a {
      color: #94a3b8;
      margin-right: 16px;
      display: inline-block;
      margin-bottom: 8px;
    }

    .friend-links-box a:hover {
      color: #34d399;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      text-align: center;
      font-size: 0.82rem;
      color: #64748b;
    }

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

    .kefu-btn {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: #ffffff;
      border-radius: var(--radius-full);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
      cursor: pointer;
      border: none;
      transition: var(--transition);
      position: relative;
    }

    .kefu-btn:hover {
      background: var(--primary-hover);
      transform: scale(1.05);
    }

    .kefu-popover {
      display: none;
      position: absolute;
      right: 58px;
      bottom: 0;
      background: #ffffff;
      padding: 14px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      width: 170px;
      text-align: center;
    }

    .kefu-popover img {
      width: 140px;
      height: 140px;
      object-fit: cover;
      display: block;
      margin: 0 auto 6px;
    }

    .kefu-popover span {
      font-size: 0.8rem;
      color: var(--text-main);
      font-weight: 600;
    }

    .floating-kefu:hover .kefu-popover {
      display: block;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2rem;
      }
      .grid-4, .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-form-layout {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .news-wrapper {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        gap: 0;
      }
      .nav-links.active li {
        width: 100%;
      }
      .nav-links.active li a {
        padding: 10px 0;
        border-bottom: 1px solid #f1f5f9;
      }
      .promo-banner-strip {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 600px) {
      .hero-title {
        font-size: 1.6rem;
      }
      .grid-4, .grid-3, .grid-2, .hero-stats-grid, .process-timeline, .case-banner-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 1.5rem;
      }
      .promo-banner-strip {
        grid-template-columns: 1fr;
      }
    }