:root {
      --primary-color: #ff5e36;
      --primary-light: #ff7e5f;
      --secondary-color: #6c5ce7;
      --accent-color: #00cec9;
      --bg-main: #faf9f6;
      --bg-card: #ffffff;
      --text-main: #1f242e;
      --text-sub: #4b5563;
      --text-muted: #8c95a6;
      --border-color: #eaeef5;
      --card-shadow: 0 10px 30px rgba(108, 92, 231, 0.08);
      --card-shadow-hover: 0 16px 40px rgba(255, 94, 54, 0.15);
      --container-width: 1200px;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at 10% 10%, rgba(255, 126, 95, 0.05), transparent 40%),
                  radial-gradient(circle at 90% 40%, rgba(108, 92, 231, 0.05), transparent 40%),
                  radial-gradient(circle at 50% 80%, rgba(0, 206, 201, 0.05), transparent 50%),
                  var(--bg-main);
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.3s ease;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--text-main);
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

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

    .nav-links li a {
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-sub);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--primary-color);
      background: rgba(255, 94, 54, 0.06);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.3s ease;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(255, 94, 54, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 94, 54, 0.4);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      border-color: #d1d5db;
      color: var(--text-main);
    }

    .btn-outline:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
      background: rgba(255, 94, 54, 0.04);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 区域通用标题 */
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary-color);
      background: rgba(255, 94, 54, 0.1);
      border-radius: 30px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-sub);
    }

    .section-padding {
      padding: 70px 0;
    }

    /* 首屏 Hero (严禁出现图片) */
    .hero-section {
      padding: 90px 0 60px;
      text-align: center;
      position: relative;
    }

    .hero-h1 {
      font-size: 2.6rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      color: #1a1e29;
      letter-spacing: -0.5px;
    }

    .hero-h1 span {
      background: linear-gradient(135deg, #ff5e36, #6c5ce7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-p {
      font-size: 1.15rem;
      color: var(--text-sub);
      max-width: 820px;
      margin: 0 auto 34px;
      line-height: 1.7;
    }

    .hero-cta {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .hero-cta .btn-lg {
      padding: 14px 34px;
      font-size: 1.1rem;
    }

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

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 24px 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(255, 94, 54, 0.3);
    }

    .stat-value {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-color);
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 0.95rem;
      color: var(--text-sub);
      font-weight: 500;
    }

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

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(108, 92, 231, 0.3);
    }

    .feature-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(255, 94, 54, 0.12), rgba(108, 92, 231, 0.12));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      color: var(--primary-color);
    }

    .feature-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .feature-text {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.65;
    }

    /* 场景分类网格 (多场景展示) */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .scenario-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      transition: all 0.3s ease;
    }

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

    .scenario-name {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

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

    /* 模型矩阵标签云 */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid #dfe4ea;
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 6px rgba(0,0,0,0.03);
      transition: all 0.25s ease;
    }

    .model-chip:hover {
      background: var(--secondary-color);
      color: #ffffff;
      border-color: var(--secondary-color);
      transform: scale(1.05);
    }

    /* 媒体与案例展示区 */
    .media-showcase-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .media-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }

    .media-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }

    .media-img-wrap {
      width: 100%;
      height: 220px;
      background: #f1f3f7;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

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

    .media-info {
      padding: 20px;
    }

    .media-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .media-caption {
      font-size: 0.9rem;
      color: var(--text-sub);
      line-height: 1.5;
    }

    /* 标准流程时间线 */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px 20px;
      position: relative;
      box-shadow: var(--card-shadow);
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      color: #ffffff;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
    }

    .step-name {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-detail {
      font-size: 0.9rem;
      color: var(--text-sub);
    }

    /* 对比评测板块 */
    .evaluation-card {
      background: linear-gradient(145deg, #ffffff, #fffbf9);
      border: 1px solid rgba(255, 94, 54, 0.2);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--card-shadow);
      margin-bottom: 30px;
    }

    .eval-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      margin-bottom: 28px;
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 20px;
    }

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

    .score-big {
      font-size: 3rem;
      font-weight: 900;
      color: var(--primary-color);
      line-height: 1;
    }

    .score-stars {
      color: #f39c12;
      font-size: 1.3rem;
      margin-bottom: 4px;
    }

    .score-label {
      font-size: 0.9rem;
      color: var(--text-sub);
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

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

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

    /* 需求匹配与表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: start;
    }

    .form-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 34px;
      box-shadow: var(--card-shadow);
    }

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

    .form-group label {
      display: block;
      font-size: 0.92rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #d1d5db;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      transition: border 0.3s;
      background: #fafafa;
    }

    .form-control:focus {
      border-color: var(--primary-color);
      background: #ffffff;
    }

    .contact-info-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 34px;
      box-shadow: var(--card-shadow);
    }

    .contact-item {
      display: flex;
      gap: 14px;
      margin-bottom: 20px;
      align-items: center;
    }

    .contact-icon {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: rgba(108, 92, 231, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--secondary-color);
      font-weight: 700;
      flex-shrink: 0;
    }

    .qr-container {
      text-align: center;
      margin-top: 24px;
      padding: 20px;
      background: #f9fafb;
      border-radius: var(--radius-md);
      border: 1px dashed #d1d5db;
    }

    .qr-container img {
      max-width: 140px;
      height: auto;
      border-radius: 8px;
      margin-bottom: 8px;
    }

    /* 用户评论网格 */
    .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: 26px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-stars {
      color: #f39c12;
      font-size: 1.1rem;
      margin-bottom: 12px;
    }

    .review-body {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 18px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
    }

    .author-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .author-title {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴面板 */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }

    .faq-question {
      padding: 18px 24px;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

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

    .faq-icon {
      font-weight: 700;
      transition: transform 0.3s;
    }

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

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.65;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 文章列表与资讯 */
    .articles-section {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--card-shadow);
    }

    .article-links-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
      margin-top: 18px;
    }

    .article-links-list a {
      display: flex;
      align-items: center;
      padding: 12px 18px;
      background: #f8fafc;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-sub);
      border: 1px solid #edf2f7;
    }

    .article-links-list a:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
      background: #ffffff;
      transform: translateX(4px);
    }

    /* 页脚与系统底部 */
    .site-footer {
      background: #111827;
      color: #9ca3af;
      padding: 60px 0 30px;
      margin-top: 60px;
      border-top: 1px solid #1f2937;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-brand h3 {
      color: #ffffff;
      font-size: 1.3rem;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.6;
      max-width: 320px;
    }

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

    .footer-col ul {
      list-style: none;
    }

    .footer-col ul li {
      margin-bottom: 10px;
    }

    .footer-col ul li a {
      color: #9ca3af;
      font-size: 0.9rem;
    }

    .footer-col ul li a:hover {
      color: #ffffff;
    }

    .friend-links-area {
      border-top: 1px solid #1f2937;
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friend-links-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: #e5e7eb;
      margin-bottom: 12px;
    }

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

    .friend-links-wrap a {
      color: #9ca3af;
      font-size: 0.88rem;
    }

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

    .footer-bottom {
      border-top: 1px solid #1f2937;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #6b7280;
    }

    /* 浮动客服入口 */
    .float-service {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 15px rgba(255, 94, 54, 0.4);
      cursor: pointer;
      font-size: 1.2rem;
      transition: transform 0.3s;
      border: none;
    }

    .float-btn:hover {
      transform: scale(1.1);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-stats-grid, .scenario-grid, .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .feature-grid, .media-showcase-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links, .nav-actions .btn-outline {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-h1 {
        font-size: 1.9rem;
      }
      .section-title {
        font-size: 1.7rem;
      }
      .feature-grid, .media-showcase-grid, .reviews-grid, .scenario-grid, .hero-stats-grid, .flow-steps, .article-links-list {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .eval-header {
        flex-direction: column;
        align-items: flex-start;
      }
    }