:root {
      --primary: #2563eb;
      --primary-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 50%, #ec4899 100%);
      --accent-warm: #f97316;
      --accent-cyan: #06b6d4;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --border-focus: #3b82f6;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(37, 99, 235, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-lg: 0 20px 35px -10px rgba(124, 58, 237, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-page);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background: radial-gradient(circle at 10% 10%, rgba(37, 99, 235, 0.04), transparent 40%),
                  radial-gradient(circle at 90% 40%, rgba(236, 72, 153, 0.04), transparent 50%),
                  radial-gradient(circle at 50% 80%, rgba(6, 182, 212, 0.04), transparent 45%),
                  var(--bg-page);
      line-height: 1.65;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease, transform 0.2s ease;
    }

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

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .brand-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;
      letter-spacing: -0.5px;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background-color: rgba(37, 99, 235, 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-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(124, 58, 237, 0.35);
    }

    .btn-outline {
      border-color: #cbd5e1;
      background-color: #ffffff;
      color: var(--text-main);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: rgba(37, 99, 235, 0.04);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    .section-padding {
      padding-top: 80px;
      padding-bottom: 80px;
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 52px;
    }

    .badge-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      border-radius: 9999px;
      background: rgba(37, 99, 235, 0.08);
      color: var(--primary);
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      line-height: 1.3;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

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

    /* 首屏纯CSS与排版，严禁任何图片出现 */
    .hero-section {
      padding-top: 90px;
      padding-bottom: 80px;
      text-align: center;
      position: relative;
    }

    .hero-content {
      max-width: 880px;
      margin: 0 auto;
    }

    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 22px;
      letter-spacing: -1px;
    }

    .hero-h1 span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.7;
    }

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

    .btn-hero-primary {
      padding: 15px 36px;
      font-size: 1.1rem;
      border-radius: var(--radius-md);
      box-shadow: 0 10px 25px rgba(37, 99, 235, 0.3);
    }

    .btn-hero-secondary {
      padding: 15px 32px;
      font-size: 1.1rem;
      border-radius: var(--radius-md);
    }

    .hero-feature-tags {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 12px;
      margin-top: 10px;
    }

    .hero-tag-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 9999px;
      font-size: 0.88rem;
      color: var(--text-main);
      font-weight: 500;
      box-shadow: var(--shadow-sm);
    }

    .hero-tag-item svg {
      width: 14px;
      height: 14px;
      fill: var(--primary);
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 50px;
    }

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
    }

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

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

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

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

    .intro-card:hover {
      border-color: rgba(37, 99, 235, 0.4);
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .intro-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(37, 99, 235, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }

    .intro-card h3 {
      font-size: 1.25rem;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .intro-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 模型矩阵徽章墙 */
    .models-marquee-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
      margin-bottom: 40px;
    }

    .model-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .model-pill {
      padding: 6px 14px;
      background: #f1f5f9;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      font-size: 0.88rem;
      font-weight: 600;
      color: #334155;
      transition: all 0.2s ease;
    }

    .model-pill:hover {
      background: #2563eb;
      color: #ffffff;
      border-color: #2563eb;
      transform: scale(1.05);
    }

    /* 场景卡片列表 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .scenario-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }

    .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(124, 58, 237, 0.3);
    }

    .scenario-card h3 {
      font-size: 1.15rem;
      color: var(--text-main);
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

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

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

    .process-node {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px 20px;
      text-align: center;
      position: relative;
    }

    .node-num {
      width: 44px;
      height: 44px;
      margin: 0 auto 16px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      font-size: 1.1rem;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
    }

    .process-node h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .process-node p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 行业方案展示卡片 */
    .industry-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .industry-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }

    .industry-card h3 {
      font-size: 1.2rem;
      color: var(--primary);
      margin-bottom: 12px;
    }

    .industry-card ul {
      list-style: none;
      font-size: 0.92rem;
      color: var(--text-muted);
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .industry-card ul li::before {
      content: "✓";
      color: #10b981;
      font-weight: bold;
      margin-right: 8px;
    }

    /* 对比评测表格与评分卡 */
    .compare-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

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

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

    .score-stars {
      color: #f59e0b;
      font-size: 1.5rem;
      letter-spacing: 2px;
    }

    .score-text {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .score-max {
      font-size: 1rem;
      color: var(--text-light);
      font-weight: 400;
    }

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

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

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

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

    .compare-table tr:hover td {
      background-color: rgba(37, 99, 235, 0.02);
    }

    .col-highlight {
      background-color: rgba(37, 99, 235, 0.04);
      font-weight: 600;
      color: var(--primary);
    }

    /* 案例中心媒体排版 */
    .media-case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
      margin-bottom: 30px;
    }

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

    .media-img-wrap {
      width: 100%;
      height: 240px;
      background: #f1f5f9;
      overflow: hidden;
    }

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

    .media-card:hover .media-img-wrap img {
      transform: scale(1.03);
    }

    .media-body {
      padding: 22px;
    }

    .media-body h3 {
      font-size: 1.15rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }

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

    .media-square-wrap {
      display: grid;
      grid-template-columns: 280px 1fr;
      gap: 28px;
      align-items: center;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .square-img-box {
      width: 100%;
      height: 240px;
      border-radius: var(--radius-sm);
      overflow: hidden;
      background: #f1f5f9;
    }

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

    /* 用户评论卡片 */
    .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(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 16px;
    }

    .author-avatar-text {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
    }

    .author-info h4 {
      font-size: 0.95rem;
      color: var(--text-main);
    }

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

    /* FAQ 展开手风琴 */
    .faq-wrapper {
      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: var(--shadow-sm);
    }

    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      text-align: left;
    }

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

    .faq-icon {
      font-size: 1.3rem;
      transition: transform 0.25s ease;
      color: var(--primary);
    }

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

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px solid #f8fafc;
    }

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

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

    .match-form {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

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

    .form-label {
      display: block;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
      background: #f8fafc;
      color: var(--text-main);
      transition: all 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--border-focus);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }

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

    /* 行业资讯 & 最新文章 */
    .articles-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .article-links-box {
      margin-top: 20px;
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding-top: 20px;
      border-top: 1px dashed var(--border-color);
    }

    .article-link-tag {
      padding: 6px 14px;
      background: #f1f5f9;
      border-radius: 6px;
      font-size: 0.88rem;
      color: var(--primary);
    }

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

    /* 代理加盟政策条 */
    .agent-banner {
      background: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(236, 72, 153, 0.08) 100%);
      border: 1px solid rgba(37, 99, 235, 0.2);
      border-radius: var(--radius-lg);
      padding: 40px;
      text-align: center;
    }

    .agent-banner h3 {
      font-size: 1.6rem;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .agent-banner p {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto 24px;
    }

    /* 底部专属统一架构 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding-top: 60px;
      padding-bottom: 30px;
      margin-top: auto;
      border-top: 1px solid #1e293b;
    }

    .site-footer a {
      color: #94a3b8;
    }

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

    .footer-top-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      padding-bottom: 40px;
      border-bottom: 1px solid #1e293b;
    }

    .footer-col h4 {
      font-size: 1.05rem;
      color: #ffffff;
      margin-bottom: 18px;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 0.92rem;
    }

    .footer-qr-block {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-top: 14px;
    }

    .footer-qr-img {
      width: 90px;
      height: 90px;
      border-radius: 6px;
      background: #ffffff;
      padding: 4px;
    }

    .footer-qr-img img {
      width: 100%;
      height: 100%;
      object-fit: contain;
    }

    .footer-links-row {
      padding-top: 24px;
      padding-bottom: 24px;
      border-bottom: 1px solid #1e293b;
      font-size: 0.88rem;
    }

    .footer-links-row strong {
      color: #e2e8f0;
      margin-right: 12px;
    }

    .footer-links-row a {
      margin-right: 16px;
      display: inline-block;
    }

    .footer-copyright {
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 悬浮客服挂件 */
    .floating-service {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      transition: all 0.2s ease;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.08);
    }

    .back-top {
      display: none;
    }

    /* 响应式断点控制 */
    @media (max-width: 1024px) {
      .stats-grid,
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .scenario-grid,
      .intro-grid,
      .industry-grid,
      .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .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;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        padding: 12px;
      }
      .hero-h1 {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.75rem;
      }
      .stats-grid,
      .process-timeline,
      .scenario-grid,
      .intro-grid,
      .industry-grid,
      .reviews-grid,
      .media-case-grid {
        grid-template-columns: 1fr;
      }
      .media-square-wrap {
        grid-template-columns: 1fr;
      }
      .match-form {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
    }