:root {
      --primary-color: #4f46e5;
      --primary-hover: #4338ca;
      --accent-color: #ff5722;
      --accent-light: #fff3e0;
      --secondary-color: #06b6d4;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
      --shadow-md: 0 10px 25px -5px rgba(79, 70, 229, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 20px 35px -10px rgba(79, 70, 229, 0.15);
      --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 {
      width: 100%;
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 顶部导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary-color);
      letter-spacing: -0.5px;
    }

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

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

    .nav-links li {
      margin: 0;
      padding: 0;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--text-main);
      font-size: 0.92rem;
      font-weight: 600;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
      white-space: nowrap;
      display: inline-block;
    }

    .nav-links a:hover {
      color: var(--primary-color);
      background-color: rgba(79, 70, 229, 0.06);
    }

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

    .btn-nav-primary {
      background: linear-gradient(135deg, var(--primary-color), #6366f1);
      color: #ffffff !important;
      padding: 9px 18px !important;
      border-radius: var(--radius-sm);
      font-weight: 700 !important;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
    }

    .btn-nav-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 5px;
    }

    /* 模块通用样式 */
    .section-padding {
      padding: 80px 0;
    }

    .section-bg-alt {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 750px;
      margin: 0 auto 50px;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: var(--accent-light);
      color: var(--accent-color);
      font-size: 0.85rem;
      font-weight: 700;
      border-radius: 50px;
      margin-bottom: 12px;
      border: 1px solid rgba(255, 87, 34, 0.2);
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

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

    /* Hero 首屏 - 无图片样式 */
    .hero-section {
      padding: 90px 0 70px;
      background: radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.12) 0%, rgba(255, 255, 255, 0) 50%),
                  radial-gradient(circle at 10% 80%, rgba(79, 70, 229, 0.12) 0%, rgba(255, 255, 255, 0) 50%),
                  #ffffff;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content {
      text-align: left;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(79, 70, 229, 0.08);
      color: var(--primary-color);
      font-weight: 700;
      font-size: 0.9rem;
      border-radius: 30px;
      margin-bottom: 20px;
    }

    .main-h1 {
      font-size: 2.3rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }

    .main-h1 span {
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.7;
    }

    .hero-btns {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      font-size: 1rem;
      font-weight: 700;
      border-radius: var(--radius-md);
      text-decoration: none;
      transition: all 0.25s ease;
      cursor: pointer;
    }

    .btn-accent {
      background: linear-gradient(135deg, var(--accent-color), #f4511e);
      color: #ffffff;
      box-shadow: 0 8px 20px rgba(255, 87, 34, 0.3);
    }

    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 25px rgba(255, 87, 34, 0.4);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--primary-color);
      border: 2px solid var(--primary-color);
    }

    .btn-outline:hover {
      background: rgba(79, 70, 229, 0.05);
      transform: translateY(-2px);
    }

    .hero-features-list {
      margin-top: 30px;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }

    .hero-feat-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .hero-feat-item::before {
      content: "✓";
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 20px;
      height: 20px;
      background: rgba(6, 182, 212, 0.15);
      color: var(--secondary-color);
      border-radius: 50%;
      font-size: 0.75rem;
      font-weight: 900;
    }

    .hero-card-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

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

    .panel-title {
      font-size: 1.1rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .panel-badge {
      background: #dcfce7;
      color: #15803d;
      font-size: 0.8rem;
      padding: 4px 10px;
      border-radius: 20px;
      font-weight: 700;
    }

    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .metric-card {
      background: var(--bg-main);
      padding: 18px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .metric-value {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--primary-color);
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 平台支持模型标签 */
    .models-marquee {
      margin-top: 24px;
      padding: 16px;
      background: rgba(79, 70, 229, 0.03);
      border-radius: var(--radius-md);
      border: 1px dashed rgba(79, 70, 229, 0.2);
    }

    .models-label {
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--primary-color);
      text-transform: uppercase;
      margin-bottom: 10px;
      display: block;
    }

    .models-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 3px 10px;
      border-radius: 6px;
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    /* 服务与能力卡片区 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
      gap: 24px;
    }

    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-color);
    }

    .service-icon-box {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(6, 182, 212, 0.1));
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 800;
      margin-bottom: 18px;
    }

    .service-card h3 {
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .service-card p {
      color: var(--text-muted);
      font-size: 0.95rem;
      margin-bottom: 16px;
      line-height: 1.6;
    }

    .service-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .service-tag-item {
      font-size: 0.75rem;
      padding: 3px 8px;
      background: var(--bg-main);
      color: var(--text-muted);
      border-radius: 4px;
      font-weight: 600;
    }

    /* 对比评测模块 */
    .review-box {
      background: linear-gradient(135deg, #1e1b4b, #312e81);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      margin-bottom: 40px;
      box-shadow: var(--shadow-lg);
    }

    .review-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.15);
      padding-bottom: 24px;
      margin-bottom: 30px;
    }

    .review-score-title {
      font-size: 1.5rem;
      font-weight: 800;
    }

    .review-stars-wrapper {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .stars-icon {
      color: #fbbf24;
      font-size: 1.5rem;
      letter-spacing: 2px;
    }

    .score-badge {
      background: var(--accent-color);
      color: #ffffff;
      padding: 6px 16px;
      border-radius: 30px;
      font-weight: 900;
      font-size: 1.1rem;
    }

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

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      background: #ffffff;
      color: var(--text-main);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

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

    .compare-table th {
      background: #f1f5f9;
      font-weight: 800;
      color: var(--text-main);
    }

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

    .highlight-cell {
      background: rgba(79, 70, 229, 0.05);
      font-weight: 700;
      color: var(--primary-color);
    }

    /* 标准流程步骤 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 20px;
      position: relative;
    }

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

    .step-number {
      font-size: 2.2rem;
      font-weight: 900;
      color: rgba(79, 70, 229, 0.2);
      position: absolute;
      top: 15px;
      right: 20px;
    }

    .step-card h4 {
      font-size: 1.15rem;
      font-weight: 800;
      margin-bottom: 10px;
      color: var(--primary-color);
    }

    .step-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 案例展厅与素材 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .case-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .case-img-wrap {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: #f1f5f9;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }

    .case-body {
      padding: 20px;
    }

    .case-body h4 {
      font-size: 1.1rem;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .case-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 用户评论区 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 20px;
    }

    .user-review-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.1rem;
    }

    .user-name {
      font-weight: 800;
      font-size: 1rem;
    }

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

    .review-text {
      font-size: 0.92rem;
      color: var(--text-main);
      line-height: 1.6;
    }

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.02rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      transition: background 0.2s ease;
    }

    .faq-question:hover {
      background: rgba(79, 70, 229, 0.02);
    }

    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary-color);
      transition: transform 0.3s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #f8fafc;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 16px 24px 20px;
      border-top: 1px solid var(--border-color);
    }

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

    /* 文章资讯区 */
    .articles-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
    }

    .banner-container {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-bottom: 24px;
    }

    .banner-container img {
      border-radius: var(--radius-sm);
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 12px;
      margin-top: 20px;
    }

    .article-link-item {
      display: block;
      padding: 12px 16px;
      background: var(--bg-main);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      color: var(--primary-color);
      text-decoration: none;
      font-size: 0.9rem;
      font-weight: 600;
      transition: all 0.2s ease;
    }

    .article-link-item:hover {
      background: rgba(79, 70, 229, 0.08);
      transform: translateX(4px);
    }

    /* 表单与联系区域 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }

    .form-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      margin-bottom: 6px;
      font-weight: 700;
      font-size: 0.9rem;
      color: var(--text-main);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background: #ffffff;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    }

    .form-submit-btn {
      width: 100%;
      padding: 14px;
      background: linear-gradient(135deg, var(--primary-color), #4338ca);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 1rem;
      font-weight: 800;
      cursor: pointer;
      transition: all 0.25s ease;
    }

    .form-submit-btn:hover {
      opacity: 0.95;
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(79, 70, 229, 0.3);
    }

    .contact-info-box {
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.05), rgba(6, 182, 212, 0.05));
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
    }

    .contact-method-item {
      margin-bottom: 24px;
    }

    .contact-method-title {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 700;
      text-transform: uppercase;
      margin-bottom: 4px;
    }

    .contact-method-value {
      font-size: 1.1rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .qr-flex-group {
      display: flex;
      gap: 20px;
      margin-top: 20px;
      align-items: center;
    }

    .qr-card {
      text-align: center;
      background: #ffffff;
      padding: 14px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .qr-card img {
      width: 120px;
      height: 120px;
      display: block;
      border-radius: var(--radius-sm);
      margin-bottom: 8px;
    }

    .qr-card p {
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--text-main);
    }

    /* 加盟代理模块 */
    .agency-card {
      background: linear-gradient(135deg, #fff7ed, #ffedd5);
      border: 1px solid #fed7aa;
      border-radius: var(--radius-lg);
      padding: 40px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 24px;
    }

    .agency-text h3 {
      font-size: 1.6rem;
      font-weight: 900;
      color: #9a3412;
      margin-bottom: 10px;
    }

    .agency-text p {
      color: #c2410c;
      font-size: 1.05rem;
      max-width: 650px;
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 800;
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
    }

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

    .footer-links a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s ease;
    }

    .footer-links a:hover {
      color: #ffffff;
    }

    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-top: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .friend-links-box span {
      color: #ffffff;
      font-size: 0.85rem;
      font-weight: 700;
    }

    .friend-links-box a {
      color: #64748b;
      font-size: 0.85rem;
      text-decoration: none;
    }

    .friend-links-box a:hover {
      color: #38bdf8;
    }

    .copyright-bar {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    .ai-page-home-link {
      color: #38bdf8 !important;
      font-weight: 700;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .header-container {
        position: relative;
      }
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        box-shadow: var(--shadow-md);
      }
      .nav-menu.active {
        display: block;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .mobile-toggle {
        display: block;
      }
      .main-h1 {
        font-size: 1.75rem;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .banner-container {
        grid-template-columns: 1fr;
      }
    }