:root {
      --primary: #e0246a;
      --primary-dark: #b81450;
      --primary-light: #fff0f5;
      --primary-gradient: linear-gradient(135deg, #e0246a 0%, #ff527b 100%);
      --accent-soft: #fde2e8;
      --bg-page: #faf9fb;
      --bg-card: #ffffff;
      --text-main: #1f2329;
      --text-muted: #5c626d;
      --border-color: #f0e6ec;
      --shadow-sm: 0 4px 12px rgba(224, 36, 106, 0.05);
      --shadow-md: 0 10px 25px rgba(224, 36, 106, 0.08);
      --shadow-hover: 0 16px 36px rgba(224, 36, 106, 0.14);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease, background-color 0.25s ease, border-color 0.25s ease;
    }

    img {
      display: block;
      max-width: 100%;
      height: auto;
    }

    /* 容器统一规范 */
    .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-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
    }

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

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

    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0; /* 满足CSS .nav-links gap为0的要求 */
      list-style: none;
    }

    .nav-links li {
      margin: 0;
    }

    .nav-links a {
      display: block;
      padding: 8px 14px;
      font-size: 0.95rem;
      color: var(--text-main);
      font-weight: 500;
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }

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

    .btn-main-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 7px 18px;
      font-size: 0.9rem;
      font-weight: 600;
      border-radius: 30px;
      background: transparent;
      cursor: pointer;
    }

    .btn-main-outline:hover {
      background-color: var(--primary);
      color: #fff;
    }

    .btn-main-primary {
      background: var(--primary-gradient);
      color: #fff;
      padding: 8px 22px;
      font-size: 0.9rem;
      font-weight: 600;
      border-radius: 30px;
      box-shadow: 0 4px 14px rgba(224, 36, 106, 0.25);
      border: none;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }

    .btn-main-primary:hover {
      opacity: 0.95;
      transform: translateY(-1px);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .mobile-menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--text-main);
      margin: 5px 0;
      transition: all 0.3s;
    }

    /* 首屏 HERO (无图片纯CSS构建) */
    .hero-section {
      background: linear-gradient(180deg, #fff7f9 0%, #faf9fb 100%);
      padding: 70px 0 60px;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      background-color: var(--primary-light);
      border: 1px solid #ffd4e0;
      border-radius: 30px;
      color: var(--primary-dark);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.35rem;
      line-height: 1.35;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

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

    .hero-desc {
      font-size: 1.12rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 34px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-buttons {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .btn-hero-primary {
      padding: 13px 34px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 30px;
      background: var(--primary-gradient);
      color: #fff;
      box-shadow: 0 8px 20px rgba(224, 36, 106, 0.3);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .btn-hero-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 26px rgba(224, 36, 106, 0.38);
    }

    .btn-hero-secondary {
      padding: 13px 30px;
      font-size: 1.05rem;
      font-weight: 600;
      border-radius: 30px;
      border: 1.5px solid var(--border-color);
      background-color: #fff;
      color: var(--text-main);
    }

    .btn-hero-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 30px;
    }

    .hero-stat-card {
      background: #fff;
      padding: 22px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }

    .hero-stat-val {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
      line-height: 1.2;
    }

    .hero-stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 通用板块布局 */
    .section-padding {
      padding: 65px 0;
    }

    .section-head {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 45px;
    }

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

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

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

    /* 平台支持的大模型网格 */
    .models-chip-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 20px;
    }

    .model-chip {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }

    .model-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: var(--primary-light);
      transform: translateY(-2px);
    }

    /* 场景卡片矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #ffccd9;
    }

    .service-icon-box {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background-color: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
      margin-bottom: 16px;
    }

    .service-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    .service-card-tag {
      margin-top: 14px;
      font-size: 0.8rem;
      color: var(--primary-dark);
      font-weight: 600;
      display: inline-block;
    }

    /* 平台介绍与图文双栏 */
    .feature-split {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      margin-bottom: 50px;
    }

    .feature-split.reverse {
      direction: rtl;
    }

    .feature-split.reverse .split-content {
      direction: ltr;
    }

    .split-content h3 {
      font-size: 1.6rem;
      font-weight: 700;
      margin-bottom: 14px;
      color: var(--text-main);
    }

    .split-content p {
      font-size: 0.98rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.7;
    }

    .split-points {
      list-style: none;
      margin-bottom: 24px;
    }

    .split-points li {
      position: relative;
      padding-left: 24px;
      font-size: 0.95rem;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .split-points li::before {
      content: "✓";
      position: absolute;
      left: 0;
      color: var(--primary);
      font-weight: bold;
    }

    .img-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

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

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

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

    .step-number {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #fff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-size: 1rem;
    }

    .step-card h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* 对比评测表格 */
    .review-score-box {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      box-shadow: var(--shadow-sm);
    }

    .score-badge {
      display: flex;
      align-items: baseline;
      gap: 6px;
    }

    .score-badge .score-num {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
    }

    .score-badge .score-total {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    .score-stars {
      color: #ff9800;
      font-size: 1.3rem;
      letter-spacing: 2px;
      margin-left: 10px;
    }

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

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

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f2f5;
    }

    .compare-table th {
      background-color: #fff4f7;
      color: var(--text-main);
      font-weight: 700;
    }

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

    .compare-table .highlight-col {
      background-color: #fffafc;
      color: var(--primary-dark);
      font-weight: 600;
    }

    /* 案例展示 */
    .banners-gallery {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-bottom: 24px;
    }

    .banner-item {
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background-color: #fff;
      box-shadow: var(--shadow-sm);
    }

    .banner-item img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    .banner-caption {
      padding: 10px 12px;
      font-size: 0.85rem;
      font-weight: 600;
      text-align: center;
      color: var(--text-main);
    }

    /* 用户评论 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .testimonial-card {
      background: #fff;
      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;
    }

    .testi-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .testi-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .testi-info h4 {
      font-size: 0.98rem;
      font-weight: 700;
    }

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

    .testi-content {
      font-size: 0.92rem;
      color: var(--text-main);
      line-height: 1.6;
      font-style: normal;
    }

    /* FAQ 手风琴 */
    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

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

    .faq-question {
      padding: 18px 22px;
      font-weight: 700;
      font-size: 1rem;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #fff;
    }

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
      background-color: #fffbfd;
      padding: 0 22px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 14px 22px 20px;
      border-top: 1px solid #fdeef2;
    }

    /* 表单与联系 */
    .contact-wrapper {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
    }

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

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

    .form-control {
      width: 100%;
      padding: 11px 16px;
      border: 1px solid #ddd;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-family: inherit;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(224, 36, 106, 0.12);
    }

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

    .btn-submit-form {
      width: 100%;
      padding: 14px;
      font-size: 1.05rem;
      font-weight: 700;
      background: var(--primary-gradient);
      color: #fff;
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: opacity 0.2s ease, transform 0.1s ease;
    }

    .btn-submit-form:hover {
      opacity: 0.94;
    }

    .btn-submit-form:active {
      transform: scale(0.99);
    }

    .contact-info-panel {
      background: #fff8fa;
      border: 1px solid #ffdeea;
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .contact-info-panel h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--primary-dark);
    }

    .contact-meta-item {
      margin-bottom: 14px;
      font-size: 0.92rem;
      color: var(--text-main);
    }

    .contact-meta-item strong {
      color: var(--text-main);
      display: inline-block;
      width: 85px;
    }

    .qr-container {
      margin-top: 15px;
      text-align: center;
    }

    .qr-container img {
      width: 130px;
      height: 130px;
      margin: 0 auto 8px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .qr-caption {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 行业资讯与短代码文章 */
    .article-posters-wrap {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-bottom: 24px;
    }

    .articles-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .article-link-tag {
      padding: 7px 14px;
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 0.88rem;
      color: var(--text-main);
      transition: all 0.2s ease;
    }

    .article-link-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-light);
    }

    /* 友情链接与页脚 */
    .footer-section {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 45px 0 30px;
      color: var(--text-main);
    }

    .friend-links-area {
      border-bottom: 1px solid #f0f0f2;
      padding-bottom: 22px;
      margin-bottom: 24px;
    }

    .friend-links-title {
      font-size: 0.92rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 12px;
    }

    .friend-links-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friend-links-flex a {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    .friend-links-flex a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 14px;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 浮动工具栏 */
    .floating-bar {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .floating-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
      cursor: pointer;
      font-weight: bold;
      transition: all 0.25s ease;
    }

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

    /* 响应式样式适配 */
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .banners-gallery {
        grid-template-columns: repeat(2, 1fr);
      }
      .testimonial-grid {
        grid-template-columns: repeat(2, 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;
        align-items: stretch;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.06);
        padding: 12px 20px;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        padding: 12px 10px;
        border-bottom: 1px solid #f6f6f8;
      }
      .nav-action {
        display: none;
      }
      .hero-title {
        font-size: 1.75rem;
      }
      .hero-desc {
        font-size: 0.95rem;
      }
      .services-grid {
        grid-template-columns: 1fr;
      }
      .feature-split,
      .feature-split.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
      }
      .feature-split.reverse .split-content {
        direction: ltr;
      }
      .steps-row {
        grid-template-columns: 1fr;
      }
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .banners-gallery {
        grid-template-columns: 1fr;
      }
      .review-score-box {
        flex-direction: column;
        align-items: flex-start;
      }
    }