:root {
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-sub: #64748b;
      --brand-primary: #06b6d4;
      --brand-accent: #8b5cf6;
      --brand-pink: #ec4899;
      --border-light: #e2e8f0;
      --border-glow: rgba(139, 92, 246, 0.25);
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-card: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
      --shadow-hover: 0 20px 30px -10px rgba(14, 165, 233, 0.18);
      --container-width: 1200px;
      --radius-md: 12px;
      --radius-lg: 18px;
    }

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

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

    .main-wrapper {
      width: 100%;
      background: radial-gradient(circle at 10% 20%, rgba(6, 182, 212, 0.06) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(236, 72, 153, 0.05) 0%, transparent 45%);
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
    }
    .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;
      object-fit: contain;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #0284c7, #7c3aed);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.92rem;
      font-weight: 600;
      padding: 8px 12px;
      border-radius: 6px;
      transition: all 0.2s ease;
    }
    .nav-links a:hover {
      color: var(--brand-accent);
      background-color: rgba(139, 92, 246, 0.08);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-top {
      padding: 8px 18px;
      font-size: 0.88rem;
      font-weight: 600;
      border-radius: 9999px;
      text-decoration: none;
      transition: all 0.2s ease;
    }
    .btn-top-outline {
      border: 1px solid var(--border-light);
      color: var(--text-main);
      background: #fff;
    }
    .btn-top-primary {
      background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
      color: #fff;
      box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    /* 通用区块排版 */
    section {
      padding: 72px 0;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 52px auto;
    }
    .section-badge {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      padding: 4px 14px;
      border-radius: 20px;
      background: rgba(139, 92, 246, 0.1);
      color: var(--brand-accent);
      margin-bottom: 12px;
      border: 1px solid rgba(139, 92, 246, 0.2);
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 首屏无图 Hero */
    .hero-section {
      padding: 80px 0 60px 0;
      text-align: center;
      position: relative;
    }
    .hero-content {
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: linear-gradient(90deg, rgba(6, 182, 212, 0.12), rgba(236, 72, 153, 0.12));
      border: 1px solid rgba(139, 92, 246, 0.3);
      border-radius: 9999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 24px;
    }
    .hero-badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
      box-shadow: 0 0 10px #10b981;
    }
    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: var(--text-main);
    }
    .text-gradient {
      background: linear-gradient(135deg, #0ea5e9 0%, #8b5cf6 50%, #ec4899 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 720px;
      margin: 0 auto 36px auto;
    }
    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 34px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 12px;
      text-decoration: none;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
    }
    .btn-primary-glow {
      background: linear-gradient(135deg, #0284c7 0%, #7c3aed 100%);
      color: #ffffff;
      box-shadow: 0 10px 25px -4px rgba(124, 58, 237, 0.45);
    }
    .btn-primary-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 15px 30px -4px rgba(124, 58, 237, 0.6);
      color: #fff;
    }
    .btn-secondary-light {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }
    .btn-secondary-light:hover {
      border-color: var(--brand-accent);
      color: var(--brand-accent);
      transform: translateY(-2px);
    }

    /* 首屏数据指标卡片群（无图纯CSS） */
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 20px;
    }
    .stat-card {
      background: rgba(255, 255, 255, 0.85);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      position: relative;
      overflow: hidden;
    }
    .stat-card::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--brand-primary), var(--brand-accent));
      opacity: 0;
      transition: opacity 0.25s ease;
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card);
      border-color: var(--border-glow);
    }
    .stat-card:hover::after {
      opacity: 1;
    }
    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 多模型生态矩阵标签云 */
    .model-matrix-strip {
      padding: 30px;
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      margin-top: 40px;
      box-shadow: var(--shadow-sm);
    }
    .matrix-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 16px;
      text-align: center;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }
    .model-tag {
      font-size: 0.82rem;
      font-weight: 600;
      color: var(--text-muted);
      background: var(--bg-page);
      border: 1px solid var(--border-light);
      padding: 6px 14px;
      border-radius: 9999px;
      transition: all 0.2s ease;
    }
    .model-tag:hover {
      border-color: var(--brand-primary);
      color: var(--brand-primary);
      background: rgba(6, 182, 212, 0.05);
    }

    /* 卡片通用网格 */
    .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;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(6, 182, 212, 0.3);
    }
    .card-icon-pill {
      display: inline-block;
      width: 44px;
      height: 44px;
      line-height: 44px;
      text-align: center;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(139, 92, 246, 0.15));
      color: var(--brand-accent);
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .card-desc {
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 流程步骤 */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .process-node {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .step-badge {
      font-size: 0.8rem;
      font-weight: 800;
      color: var(--brand-primary);
      margin-bottom: 10px;
    }
    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .step-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 对比评测表格与评测结果 */
    .eval-highlight-box {
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.08), rgba(139, 92, 246, 0.08));
      border: 1px solid rgba(139, 92, 246, 0.25);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
      margin-bottom: 36px;
    }
    .eval-score-wrap {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .eval-score-num {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--brand-accent);
      line-height: 1;
    }
    .eval-stars {
      color: #f59e0b;
      font-size: 1.3rem;
      margin-bottom: 4px;
    }
    .table-responsive {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }
    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.94rem;
    }
    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-light);
    }
    .eval-table th {
      background-color: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }
    .eval-table tr:hover td {
      background-color: #fbfcfe;
    }
    .text-tag-green {
      display: inline-block;
      padding: 3px 8px;
      font-size: 0.8rem;
      font-weight: 600;
      color: #047857;
      background: #d1fae5;
      border-radius: 4px;
    }
    .text-tag-gray {
      display: inline-block;
      padding: 3px 8px;
      font-size: 0.8rem;
      font-weight: 600;
      color: #475569;
      background: #f1f5f9;
      border-radius: 4px;
    }

    /* 案例中心 & 真实图片响应式 */
    .case-media-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-light);
      background: #ffffff;
      box-shadow: var(--shadow-sm);
    }
    .media-holder {
      width: 100%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .media-holder img {
      width: 100%;
      height: auto;
      max-width: 100%;
      display: block;
      object-fit: cover;
    }
    .case-info {
      padding: 20px;
    }
    .case-tag {
      font-size: 0.78rem;
      font-weight: 700;
      color: var(--brand-primary);
      text-transform: uppercase;
      margin-bottom: 6px;
    }
    .case-name {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .case-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 宣传图画廊展示 */
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 36px;
    }
    .banner-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      background: #fff;
    }
    .banner-item img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 用户评论 */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-stars {
      color: #f59e0b;
      font-size: 0.95rem;
      margin-bottom: 12px;
    }
    .review-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-light);
      padding-top: 14px;
    }
    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }
    .author-meta h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-meta p {
      font-size: 0.8rem;
      color: var(--text-sub);
    }

    /* 常见问题 FAQ 展开项 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: border-color 0.2s ease;
    }
    .faq-item:hover {
      border-color: rgba(139, 92, 246, 0.4);
    }
    .faq-question {
      padding: 18px 24px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 1.02rem;
      font-weight: 700;
      color: var(--text-main);
      user-select: none;
    }
    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--brand-accent);
    }
    .faq-answer {
      display: none;
      padding: 0 24px 20px 24px;
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px solid transparent;
    }
    .faq-item.active .faq-answer {
      display: block;
      border-top-color: #f1f5f9;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 表单与需求匹配 */
    .form-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-card);
    }
    .form-info h3 {
      font-size: 1.6rem;
      font-weight: 800;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .form-info p {
      color: var(--text-muted);
      margin-bottom: 24px;
      font-size: 0.95rem;
    }
    .contact-item-group {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-bottom: 28px;
    }
    .contact-line {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.92rem;
      color: var(--text-muted);
    }
    .contact-line strong {
      color: var(--text-main);
    }
    .qr-preview {
      display: inline-block;
      padding: 10px;
      border: 1px solid var(--border-light);
      border-radius: 8px;
      background: #fafafa;
    }
    .qr-preview img {
      width: 120px;
      height: 120px;
      display: block;
    }
    .form-fields {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .input-row {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .input-row label {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .input-row input, .input-row select, .input-row textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-light);
      border-radius: 8px;
      font-size: 0.92rem;
      color: var(--text-main);
      background: #f8fafc;
      outline: none;
      transition: border-color 0.2s ease;
    }
    .input-row input:focus, .input-row select:focus, .input-row textarea:focus {
      border-color: var(--brand-accent);
      background: #fff;
    }
    .input-row textarea {
      resize: vertical;
      min-height: 90px;
    }

    /* 行业资讯 & 友情链接 */
    .article-links-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }
    .article-pill-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 14px;
    }
    .article-pill {
      display: inline-flex;
      align-items: center;
      padding: 8px 16px;
      background: #f8fafc;
      border: 1px solid var(--border-light);
      border-radius: 8px;
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.88rem;
      transition: all 0.2s ease;
    }
    .article-pill:hover {
      color: var(--brand-primary);
      border-color: var(--brand-primary);
      background: #ffffff;
    }

    /* 页脚 */
    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-light);
      padding: 48px 0 32px 0;
      color: var(--text-muted);
    }
    .footer-content {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 36px;
    }
    .footer-col h4 {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s ease;
    }
    .footer-links a:hover {
      color: var(--brand-accent);
    }
    .friend-links-box {
      border-top: 1px solid var(--border-light);
      padding-top: 24px;
      margin-bottom: 24px;
    }
    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }
    .friend-links-list a {
      color: var(--text-sub);
      text-decoration: none;
      font-size: 0.86rem;
      transition: color 0.2s ease;
    }
    .friend-links-list a:hover {
      color: var(--brand-primary);
    }
    .footer-bottom {
      border-top: 1px solid #f1f5f9;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-sub);
    }

    /* 浮动组件 */
    .floating-widget {
      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;
      border: 1px solid var(--border-light);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-main);
      text-decoration: none;
      font-size: 1.1rem;
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .float-btn:hover {
      background: var(--brand-accent);
      color: #ffffff;
      border-color: var(--brand-accent);
      transform: scale(1.08);
    }

    /* 响应式媒体查询 */
    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .banner-gallery {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--border-light);
        padding: 20px;
        box-shadow: var(--shadow-card);
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 2rem;
      }
      .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .banner-gallery {
        grid-template-columns: 1fr;
      }
      .form-layout {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .footer-content {
        grid-template-columns: 1fr;
      }
      .eval-highlight-box {
        flex-direction: column;
        align-items: flex-start;
      }
      .process-timeline {
        grid-template-columns: 1fr;
      }
    }