:root {
      --primary: #0052d9;
      --primary-hover: #003cab;
      --primary-light: #e8f3ff;
      --accent: #ff6b00;
      --accent-hover: #e05b00;
      --dark-text: #1d2129;
      --body-text: #4e5969;
      --muted-text: #86909c;
      --bg-main: #f7f9fc;
      --bg-card: #ffffff;
      --border-color: #e5e6eb;
      --border-focus: #165dff;
      --shadow-sm: 0 2px 8px rgba(0, 82, 217, 0.06);
      --shadow-md: 0 8px 24px rgba(0, 82, 217, 0.08);
      --shadow-lg: 0 16px 36px rgba(0, 82, 217, 0.12);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --container-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-main);
      color: var(--dark-text);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    }

    body {
      line-height: 1.6;
      background: radial-gradient(circle at 50% 0%, #eef4ff 0%, #f7f9fc 70%);
      min-height: 100vh;
      overflow-x: hidden;
      color: var(--dark-text);
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.2s ease, opacity 0.2s ease;
    }
    a:hover {
      color: var(--primary-hover);
    }

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

    /* 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: 0 2px 10px rgba(0,0,0,0.03);
    }
    .header-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: 40px;
      width: auto;
      object-fit: contain;
    }
    .brand-name {
      font-size: 20px;
      font-weight: 700;
      color: #003cab;
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      display: block;
      padding: 10px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--dark-text);
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background-color: var(--primary-light);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: all 0.25s ease;
      text-align: center;
      line-height: 1.2;
    }
    .btn-primary {
      background: linear-gradient(135deg, #0052d9 0%, #165dff 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(0, 82, 217, 0.25);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #003cab 0%, #0052d9 100%);
      color: #ffffff;
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(0, 82, 217, 0.35);
    }
    .btn-accent {
      background: linear-gradient(135deg, #ff6b00 0%, #ff8c37 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(255, 107, 0, 0.25);
    }
    .btn-accent:hover {
      background: linear-gradient(135deg, #e05b00 0%, #ff6b00 100%);
      color: #ffffff;
      transform: translateY(-1px);
    }
    .btn-outline {
      background: #ffffff;
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary-light);
      border-color: var(--primary-hover);
      color: var(--primary-hover);
    }
    .nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--dark-text);
      cursor: pointer;
    }

    /* 区域通用规范 */
    .section {
      padding: 80px 0;
      position: relative;
    }
    .section-alt {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px;
    }
    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      background-color: var(--primary-light);
      border-radius: 30px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--dark-text);
      line-height: 1.3;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--body-text);
      line-height: 1.6;
    }

    /* 首屏 Hero（严禁任何图片） */
    .hero-section {
      padding: 90px 0 80px;
      text-align: center;
      position: relative;
      background: linear-gradient(180deg, rgba(232, 243, 255, 0.6) 0%, rgba(247, 249, 252, 0) 100%);
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid rgba(0, 82, 217, 0.2);
      border-radius: 30px;
      font-size: 14px;
      font-weight: 500;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 42px;
      font-weight: 800;
      color: #0a2540;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title .highlight {
      color: var(--primary);
      position: relative;
      display: inline-block;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--body-text);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.6;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .hero-features-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      text-align: left;
    }
    .hero-feat-item {
      display: flex;
      flex-direction: column;
      gap: 6px;
      padding: 10px 16px;
      border-left: 3px solid var(--primary);
      background: #fafcff;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    }
    .hero-feat-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--dark-text);
    }
    .hero-feat-desc {
      font-size: 13px;
      color: var(--body-text);
    }

    /* 平台介绍与概览 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .about-card-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .about-list {
      list-style: none;
      display: grid;
      gap: 16px;
      margin-top: 24px;
    }
    .about-list-item {
      display: flex;
      gap: 14px;
      align-items: flex-start;
    }
    .about-list-icon {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      flex-shrink: 0;
      font-size: 12px;
    }
    .about-list-text h4 {
      font-size: 16px;
      color: var(--dark-text);
      margin-bottom: 4px;
    }
    .about-list-text p {
      font-size: 14px;
      color: var(--body-text);
    }

    /* 支持模型标签云 */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }
    .model-tag {
      background: var(--primary-light);
      color: var(--primary-hover);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      border: 1px solid rgba(0, 82, 217, 0.15);
      transition: all 0.2s ease;
    }
    .model-tag:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }

    /* 核心服务矩阵网格 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
    }
    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(0, 82, 217, 0.3);
    }
    .service-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 14px;
    }
    .service-icon-box {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: bold;
    }
    .service-badge {
      font-size: 12px;
      color: var(--accent);
      background: #fff3eb;
      padding: 3px 8px;
      border-radius: 4px;
      font-weight: 600;
    }
    .service-card h3 {
      font-size: 18px;
      color: var(--dark-text);
      margin-bottom: 8px;
    }
    .service-card p {
      font-size: 14px;
      color: var(--body-text);
      line-height: 1.5;
      margin-bottom: 16px;
    }
    .service-link {
      font-size: 14px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 案例与素材图展示区 */
    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .gallery-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .gallery-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .gallery-img-wrap {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: #eaeff8;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .gallery-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .gallery-card:hover .gallery-img-wrap img {
      transform: scale(1.05);
    }
    .gallery-info {
      padding: 18px;
    }
    .gallery-info h4 {
      font-size: 16px;
      color: var(--dark-text);
      margin-bottom: 6px;
    }
    .gallery-info p {
      font-size: 13px;
      color: var(--body-text);
    }

    /* 对比评测高亮板块 */
    .evaluation-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 2px solid #165dff;
      padding: 36px;
      box-shadow: var(--shadow-lg);
      margin-bottom: 30px;
    }
    .eval-score-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 20px;
      margin-bottom: 24px;
      flex-wrap: wrap;
      gap: 16px;
    }
    .eval-brand-title {
      font-size: 24px;
      font-weight: 700;
      color: var(--dark-text);
    }
    .eval-score-wrap {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }
    .eval-stars {
      color: #ff9800;
      font-size: 20px;
      letter-spacing: 2px;
    }
    .eval-score-num {
      font-size: 36px;
      font-weight: 800;
      color: var(--primary);
    }
    .eval-score-total {
      font-size: 16px;
      color: var(--muted-text);
    }
    .comparison-table-wrap {
      width: 100%;
      overflow-x: auto;
    }
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .comparison-table th,
    .comparison-table td {
      padding: 14px 16px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }
    .comparison-table th {
      background-color: var(--primary-light);
      color: #003cab;
      font-weight: 700;
    }
    .comparison-table td:nth-child(2) {
      font-weight: 700;
      color: var(--primary);
      background-color: rgba(0, 82, 217, 0.02);
    }

    /* 标准流程时间线 */
    .process-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .process-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .process-step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px;
    }
    .process-card h4 {
      font-size: 16px;
      color: var(--dark-text);
      margin-bottom: 8px;
    }
    .process-card p {
      font-size: 13px;
      color: var(--body-text);
    }

    /* 用户真实评价 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-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;
    }
    .review-stars {
      color: #ff9800;
      margin-bottom: 12px;
      font-size: 14px;
    }
    .review-content {
      font-size: 14px;
      color: var(--body-text);
      line-height: 1.6;
      margin-bottom: 16px;
      font-style: italic;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 12px;
    }
    .reviewer-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }
    .reviewer-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--dark-text);
    }
    .reviewer-role {
      font-size: 12px;
      color: var(--muted-text);
    }

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: grid;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: border-color 0.2s ease;
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--dark-text);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-icon {
      font-size: 18px;
      font-weight: bold;
      transition: transform 0.3s 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: #fafcff;
      color: var(--body-text);
      font-size: 14px;
      line-height: 1.6;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 18px;
    }

    /* 需求表单与联系 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--dark-text);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--dark-text);
      background: #fafcff;
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }
    .form-control:focus {
      border-color: var(--border-focus);
      box-shadow: 0 0 0 3px rgba(22, 93, 255, 0.15);
      background: #ffffff;
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }
    .contact-info-list {
      display: grid;
      gap: 18px;
      margin-top: 24px;
    }
    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 14px;
      font-size: 15px;
      color: var(--body-text);
    }
    .contact-qr-box {
      margin-top: 24px;
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      padding: 14px;
      background: var(--bg-main);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
    }
    .contact-qr-box img {
      width: 140px;
      height: 140px;
      object-fit: cover;
      border-radius: 4px;
    }
    .contact-qr-title {
      font-size: 13px;
      font-weight: 600;
      color: var(--dark-text);
      margin-top: 8px;
    }

    /* 行业资讯与短代码文章 */
    .article-section-box {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      margin-bottom: 30px;
    }
    .article-list {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
      gap: 12px;
      margin-top: 14px;
    }
    .article-link-tag {
      display: block;
      padding: 10px 14px;
      background: var(--bg-main);
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--dark-text);
      border: 1px solid var(--border-color);
      transition: all 0.2s ease;
    }
    .article-link-tag:hover {
      background: var(--primary-light);
      color: var(--primary);
      border-color: var(--primary);
    }

    /* 友情链接与页脚 */
    .footer-section {
      background-color: #0b1528;
      color: #8c9ba5;
      padding: 60px 0 24px;
      border-top: 1px solid #1a2a44;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      font-size: 16px;
      color: #ffffff;
      margin-bottom: 18px;
      font-weight: 600;
    }
    .footer-links {
      list-style: none;
      display: grid;
      gap: 10px;
    }
    .footer-links a {
      color: #8c9ba5;
      font-size: 14px;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
    }
    .friend-links-box a {
      color: #a0aec0;
      font-size: 13px;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
    }
    .friend-links-box a:hover {
      color: #ffffff;
      background: rgba(255, 255, 255, 0.15);
    }
    .footer-bottom {
      border-top: 1px solid #1a2a44;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 14px;
      font-size: 13px;
    }
    .footer-bottom a {
      color: #8c9ba5;
    }
    .footer-bottom a:hover {
      color: #ffffff;
    }

    /* 浮动客服挂件 */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(0,0,0,0.2);
      cursor: pointer;
      font-size: 13px;
      font-weight: 700;
      text-decoration: none;
      transition: all 0.2s ease;
    }
    .float-btn:hover {
      background: var(--primary-hover);
      color: #ffffff;
      transform: scale(1.08);
    }
    .float-btn.back-top {
      background: #ffffff;
      color: var(--dark-text);
      border: 1px solid var(--border-color);
      display: none;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-features-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-grid,
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .gallery-grid,
      .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .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-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-toggle {
        display: block;
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-features-bar {
        grid-template-columns: 1fr;
      }
      .gallery-grid,
      .reviews-grid,
      .process-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }