:root {
      --primary: #059669;
      --primary-hover: #047857;
      --primary-light: #10b981;
      --accent: #34d399;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-tint: #ecfdf5;
      --text-main: #0f172a;
      --text-muted: #334155;
      --text-soft: #64748b;
      --border: #e2e8f0;
      --border-accent: #a7f3d0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(5, 150, 105, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
      --shadow-hover: 0 16px 24px -4px rgba(5, 150, 105, 0.15);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --container-width: 1200px;
    }

    * {
      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;
      -webkit-font-smoothing: antialiased;
    }

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

    header {
      position: sticky;
      top: 0;
      z-index: 100;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border);
      transition: all 0.3s ease;
    }

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

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .brand-box .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-text {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
    }

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

    .nav-links li a,
    .nav-links li .ai-page-home-link {
      display: block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      text-decoration: none;
      border-radius: var(--radius-sm);
      transition: color 0.2s ease, background-color 0.2s ease;
    }

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

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-left: 16px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: var(--radius-md);
      text-decoration: none;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      line-height: 1.2;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(5, 150, 105, 0.25);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(5, 150, 105, 0.35);
      color: #ffffff;
    }

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

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

    .btn-sm {
      padding: 6px 14px;
      font-size: 0.875rem;
      border-radius: var(--radius-sm);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      padding: 8px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* Hero Section - 纯 CSS 视觉，无任何图片 */
    .hero-section {
      background: linear-gradient(135deg, #f0fdf4 0%, #ffffff 50%, #ecfdf5 100%);
      border-bottom: 1px solid var(--border-accent);
      padding: 80px 0 60px 0;
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background-color: #d1fae5;
      color: #065f46;
      padding: 6px 14px;
      border-radius: var(--radius-full);
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 20px;
      border: 1px solid #a7f3d0;
    }

    .hero-title {
      font-size: 2.3rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--primary);
    }

    .hero-desc {
      font-size: 1.1rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 30px;
    }

    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 36px;
    }

    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .hero-tag-item {
      font-size: 0.82rem;
      color: #047857;
      background-color: rgba(16, 185, 129, 0.12);
      padding: 4px 10px;
      border-radius: 4px;
      font-weight: 500;
    }

    .hero-visual-card {
      background: #ffffff;
      border: 1px solid var(--border-accent);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

    .hero-card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 14px;
      border-bottom: 1px solid var(--border);
      margin-bottom: 16px;
    }

    .hero-card-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .hero-card-status {
      font-size: 0.8rem;
      color: var(--primary);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--primary-light);
      border-radius: 50%;
      display: inline-block;
      animation: pulseDot 2s infinite ease-in-out;
    }

    @keyframes pulseDot {
      0%, 100% { transform: scale(1); opacity: 1; }
      50% { transform: scale(1.3); opacity: 0.6; }
    }

    .hero-matrix-list {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .hero-matrix-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 14px;
      background: var(--bg-main);
      border-radius: var(--radius-sm);
      font-size: 0.88rem;
      border-left: 3px solid var(--primary);
    }

    .matrix-name {
      font-weight: 600;
      color: var(--text-main);
    }

    .matrix-val {
      font-size: 0.8rem;
      color: var(--primary-hover);
      font-weight: 500;
    }

    /* 通用Section结构 */
    .section-block {
      padding: 64px 0;
      border-bottom: 1px solid var(--border);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 44px auto;
    }

    .section-eyebrow {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* 网格与卡片 */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

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

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

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

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

    .card-icon {
      width: 44px;
      height: 44px;
      background-color: var(--bg-tint);
      color: var(--primary);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 16px;
      border: 1px solid var(--border-accent);
    }

    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

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

    /* 平台介绍板块 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: stretch;
    }

    .intro-content {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }

    .intro-content h3 {
      font-size: 1.35rem;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .intro-content p {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
      margin-bottom: 16px;
    }

    .feature-points {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .feature-point-item {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 0.92rem;
      color: var(--text-muted);
    }

    .feature-check {
      color: var(--primary);
      font-weight: bold;
    }

    /* 宣传图展示 */
    .banner-gallery {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 30px;
    }

    .banner-wrapper {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      background: #fff;
    }

    .banner-wrapper img,
    .ai-page-image {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    /* 案例图片展示 */
    .case-media-box {
      border-radius: var(--radius-sm);
      overflow: hidden;
      margin-bottom: 14px;
      border: 1px solid var(--border);
      aspect-ratio: 16/9;
      background-color: #f1f5f9;
    }

    .case-media-box.square {
      aspect-ratio: 1/1;
    }

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

    /* 对比评测表格与卡片 */
    .review-score-banner {
      background: linear-gradient(135deg, #059669 0%, #10b981 100%);
      color: #ffffff;
      padding: 28px;
      border-radius: var(--radius-lg);
      margin-bottom: 30px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .review-score-banner h3 {
      font-size: 1.4rem;
      font-weight: 700;
    }

    .review-score-banner p {
      color: #ecfdf5;
      font-size: 0.95rem;
      margin-top: 4px;
    }

    .score-badge-group {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-number {
      font-size: 2.6rem;
      font-weight: 900;
      line-height: 1;
      background: #ffffff;
      color: var(--primary);
      padding: 10px 18px;
      border-radius: var(--radius-md);
    }

    .score-stars {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }

    .star-icons {
      color: #fef08a;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }

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

    .comp-table th,
    .comp-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border);
      font-size: 0.92rem;
    }

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

    .comp-table tr:last-child td {
      border-bottom: none;
    }

    .comp-table tr:hover td {
      background-color: var(--bg-tint);
    }

    .highlight-cell {
      font-weight: 700;
      color: var(--primary);
    }

    /* 流程步骤 */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
    }

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 20px 16px;
      position: relative;
    }

    .step-num {
      font-size: 1.5rem;
      font-weight: 900;
      color: var(--primary-light);
      margin-bottom: 8px;
    }

    .step-title {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .step-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 用户评论 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testi-content {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
      position: relative;
    }

    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border);
      padding-top: 12px;
    }

    .avatar-icon {
      width: 40px;
      height: 40px;
      background: var(--bg-tint);
      color: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
      border: 1px solid var(--border-accent);
    }

    .author-info h4 {
      font-size: 0.92rem;
      color: var(--text-main);
      font-weight: 700;
    }

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

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

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

    .faq-question {
      padding: 16px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: var(--text-main);
      user-select: none;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      font-weight: bold;
      color: var(--primary);
      transition: transform 0.25s ease;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background-color: var(--bg-tint);
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 20px;
      border-top: 1px solid var(--border-accent);
    }

    /* 表单与联系区 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
      align-items: start;
    }

    .form-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: var(--text-main);
      background-color: #ffffff;
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .contact-info-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .info-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
    }

    .info-item-label {
      font-weight: 700;
      color: var(--text-main);
      min-width: 80px;
      font-size: 0.92rem;
    }

    .info-item-val {
      font-size: 0.92rem;
      color: var(--text-muted);
      word-break: break-all;
    }

    .qr-box {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      padding: 16px;
      background: var(--bg-tint);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-accent);
      margin-top: 10px;
    }

    .qr-box img {
      width: 130px;
      height: 130px;
      display: block;
      border-radius: var(--radius-sm);
    }

    .qr-desc {
      font-size: 0.85rem;
      font-weight: 600;
      color: #065f46;
    }

    /* 行业资讯 & AI百科 */
    .article-links-box {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 20px;
      margin-top: 20px;
    }

    .article-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      list-style: none;
    }

    .article-links-list li a {
      color: var(--primary);
      text-decoration: none;
      font-size: 0.88rem;
      background: var(--bg-tint);
      padding: 6px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s;
      border: 1px solid var(--border-accent);
    }

    .article-links-list li a:hover {
      background: var(--primary);
      color: #ffffff;
    }

    /* 友情链接 */
    .links-section {
      padding: 24px 0;
      background-color: #f1f5f9;
      border-top: 1px solid var(--border);
    }

    .links-title {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 12px;
    }

    .links-flow {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .links-flow a {
      font-size: 0.85rem;
      color: var(--text-soft);
      text-decoration: none;
      transition: color 0.2s ease;
    }

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

    /* 页脚 */
    footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border);
      padding: 40px 0 24px 0;
      color: var(--text-muted);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 30px;
      padding-bottom: 30px;
      border-bottom: 1px solid var(--border);
    }

    .footer-col h4 {
      font-size: 1rem;
      color: var(--text-main);
      font-weight: 700;
      margin-bottom: 14px;
    }

    .footer-col p {
      font-size: 0.88rem;
      line-height: 1.6;
      color: var(--text-muted);
    }

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

    .footer-menu li a {
      font-size: 0.88rem;
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s ease;
    }

    .footer-menu li a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.85rem;
      color: var(--text-soft);
    }

    /* 悬浮工具栏 */
    .floating-toolbar {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary);
      border: 1px solid var(--border-accent);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
      font-weight: bold;
      font-size: 1rem;
      transition: all 0.25s ease;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid,
      .intro-grid,
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a,
      .nav-links li .ai-page-home-link {
        padding: 10px 14px;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .grid-2,
      .grid-3,
      .grid-4,
      .step-grid,
      .testimonial-grid,
      .banner-gallery,
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .score-badge-group {
        width: 100%;
        justify-content: flex-start;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }