:root {
      --primary: #0F52BA;
      --primary-dark: #0A387E;
      --primary-light: #EBF2FA;
      --accent: #00A3FF;
      --accent-hover: #0088D6;
      --text-main: #1D2939;
      --text-muted: #475467;
      --text-light: #98A2B3;
      --bg-page: #F8FAFC;
      --bg-surface: #FFFFFF;
      --border-color: #E2E8F0;
      --border-light: #F1F5F9;
      --shadow-sm: 0 2px 8px rgba(15, 82, 186, 0.04);
      --shadow-md: 0 8px 24px rgba(15, 82, 186, 0.08);
      --shadow-lg: 0 16px 36px rgba(15, 82, 186, 0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      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: 1.6;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

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

    .container {
      width: 100%;
      max-width: 1200px;
      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(10px);
      border-bottom: 1px solid var(--border-color);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      height: 44px;
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

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

    .nav-links li a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 10px 14px;
      border-radius: var(--radius-sm);
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #1a6ff0 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(15, 82, 186, 0.25);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
      box-shadow: 0 6px 20px rgba(15, 82, 186, 0.35);
      transform: translateY(-1px);
    }

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

    .btn-outline:hover {
      background: var(--primary-light);
      border-color: var(--primary-dark);
    }

    .btn-accent {
      background: linear-gradient(135deg, #00A3FF 0%, #0072FF 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(0, 163, 255, 0.3);
    }

    .btn-accent:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(0, 163, 255, 0.4);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    /* Hero 首屏 - 纯代码无图片科技风 */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 80% 20%, rgba(0, 163, 255, 0.1) 0%, rgba(248, 250, 252, 0) 50%),
                  radial-gradient(circle at 10% 80%, rgba(15, 82, 186, 0.08) 0%, rgba(248, 250, 252, 0) 60%);
      border-bottom: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: var(--primary-light);
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      border-radius: 30px;
      margin-bottom: 24px;
      border: 1px solid rgba(15, 82, 186, 0.15);
    }

    .hero-title {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--primary);
      position: relative;
      display: inline-block;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px;
      line-height: 1.65;
    }

    .hero-cta {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }

    .hero-cta .btn {
      padding: 14px 32px;
      font-size: 16px;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1060px;
      margin: 0 auto;
      text-align: left;
    }

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 24px 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }

    .stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 4px;
      height: 100%;
      background: var(--primary);
      opacity: 0.8;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(15, 82, 186, 0.3);
    }

    .stat-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .stat-sub {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Section 通用规范 */
    .section-block {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-block:nth-child(even) {
      background: #FFFFFF;
    }

    .section-block:nth-child(odd) {
      background: #F8FAFC;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: inline-block;
    }

    .section-title {
      font-size: 32px;
      font-weight: 750;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 平台介绍 & 核心能力 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }

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

    .about-card h3 {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .about-card p {
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.7;
    }

    .feature-check-list {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }

    .feature-check-list li {
      font-size: 14px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 500;
    }

    .feature-check-list li::before {
      content: "✓";
      color: #10B981;
      font-weight: 800;
      background: #ECFDF5;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 11px;
      flex-shrink: 0;
    }

    /* 多模型生态徽章云 */
    .model-badge-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .model-badge {
      background: var(--bg-page);
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      transition: var(--transition);
    }

    .model-badge:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    /* 服务场景网格卡片 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

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

    .service-icon {
      width: 44px;
      height: 44px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 18px;
    }

    .service-card h4 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .service-tag {
      margin-top: 14px;
      display: inline-block;
      font-size: 12px;
      color: var(--primary);
      background: var(--primary-light);
      padding: 2px 8px;
      border-radius: 4px;
      align-self: flex-start;
    }

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

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

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
      margin-bottom: 16px;
    }

    .step-item h5 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .step-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测模块 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #0F52BA 0%, #0072FF 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 32px;
      box-shadow: var(--shadow-md);
    }

    .eval-score-wrap {
      display: flex;
      align-items: center;
      gap: 24px;
    }

    .eval-score-num {
      font-size: 52px;
      font-weight: 900;
      line-height: 1;
    }

    .eval-score-meta h4 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 4px;
    }

    .eval-stars {
      color: #FBBF24;
      font-size: 18px;
      letter-spacing: 2px;
    }

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

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    .eval-table th,
    .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    .eval-table th {
      background: #F8FAFC;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .eval-table td.highlight {
      color: var(--primary);
      font-weight: 600;
      background: rgba(15, 82, 186, 0.02);
    }

    /* 案例展示区（带图） */
    .cases-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }

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

    .case-img-wrap {
      background: #E2E8F0;
      overflow: hidden;
    }

    .case-info {
      padding: 20px;
    }

    .case-info h4 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .case-info p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    .banner-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 24px;
    }

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

    /* 用户评论 */
    .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-text {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 16px;
      font-style: italic;
    }

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

    .review-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: 700;
      font-size: 16px;
    }

    .review-meta h5 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

    .review-meta span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 表单与需求匹配 */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group-full {
      grid-column: span 2;
    }

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
      transition: var(--transition);
      background: #FDFDFD;
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.12);
      background: #ffffff;
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

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

    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-icon {
      font-size: 18px;
      font-weight: 400;
      color: var(--primary);
      transition: transform 0.25s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #FAFAFC;
    }

    .faq-answer p {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 文章列表 & 资讯 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-card:hover {
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    .article-card h5 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .article-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
      margin-bottom: 12px;
    }

    .article-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 加盟代理与服务网络 */
    .partner-banner {
      background: linear-gradient(135deg, #0A387E 0%, #0F52BA 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 30px;
      align-items: center;
    }

    .partner-banner h3 {
      font-size: 26px;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .partner-banner p {
      font-size: 15px;
      opacity: 0.9;
      line-height: 1.6;
      margin-bottom: 20px;
    }

    .contact-info-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .contact-info-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      text-align: center;
    }

    .contact-info-card strong {
      display: block;
      font-size: 15px;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .contact-info-card span {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 友情链接与页脚 */
    .friend-links-box {
      padding: 30px 0;
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
    }

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

    .friend-links-wrap span {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

    .friend-links-wrap a {
      font-size: 13px;
      color: var(--text-muted);
      background: var(--bg-page);
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid var(--border-color);
    }

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

    .site-footer {
      background: #0A192F;
      color: #94A3B8;
      padding: 50px 0 25px;
      font-size: 14px;
    }

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

    .footer-col h5 {
      color: #FFFFFF;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 16px;
    }

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

    .footer-col ul li {
      margin-bottom: 8px;
    }

    .footer-col ul li a {
      color: #94A3B8;
    }

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

    .footer-qr {
      width: 100px;
      background: #ffffff;
      padding: 4px;
      border-radius: 6px;
      margin-top: 10px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* 悬浮客服 */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(15, 82, 186, 0.4);
      cursor: pointer;
      border: none;
      position: relative;
    }

    .float-btn:hover .qr-popup {
      display: block;
    }

    .qr-popup {
      display: none;
      position: absolute;
      right: 56px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      width: 140px;
      text-align: center;
      color: var(--text-main);
      font-size: 12px;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title { font-size: 32px; }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .about-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .workflow-steps { grid-template-columns: repeat(2, 1fr); }
      .cases-grid { grid-template-columns: 1fr; }
      .banner-row { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: 1fr; }
      .articles-grid { grid-template-columns: 1fr; }
      .partner-banner { grid-template-columns: 1fr; }
      .contact-info-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .eval-highlight-box { flex-direction: column; text-align: center; gap: 20px; }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .mobile-menu-btn { display: block; }
      .form-grid { grid-template-columns: 1fr; }
      .form-group-full { grid-column: span 1; }
      .contact-info-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
      .hero-title { font-size: 28px; }
      .section-title { font-size: 24px; }
    }