:root {
      --primary: #4338ca;
      --primary-light: #6366f1;
      --accent: #06b6d4;
      --accent-warm: #f43f5e;
      --bg-light: #f8fafc;
      --card-bg: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(67, 56, 202, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 20px 30px -10px rgba(67, 56, 202, 0.12);
      --radius: 12px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-light);
      background-image: 
        radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(6, 182, 212, 0.04) 0%, transparent 40%);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .ai-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);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: var(--text-main);
      font-weight: 700;
      font-size: 1.25rem;
    }
    .logo-box img {
      max-height: 40px;
      width: auto;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      text-decoration: none;
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 14px;
      border-radius: 6px;
      transition: all 0.2s ease;
      display: inline-block;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: rgba(99, 102, 241, 0.08);
    }
    .header-action {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-header-cta {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: #ffffff !important;
      padding: 8px 18px;
      border-radius: 20px;
      text-decoration: none;
      font-weight: 600;
      font-size: 0.9rem;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .btn-header-cta:hover {
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(67, 56, 202, 0.25);
    }

    /* 移动端菜单切换 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 80px 0 60px;
      text-align: center;
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.8) 0%, rgba(248, 250, 252, 0.95) 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: linear-gradient(90deg, rgba(99, 102, 241, 0.1), rgba(6, 182, 212, 0.1));
      border: 1px solid rgba(99, 102, 241, 0.2);
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
      color: var(--text-main);
    }
    .hero-title span {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }
    .hero-buttons {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .btn-main-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
      color: #ffffff;
      text-decoration: none;
      font-weight: 700;
      font-size: 1.05rem;
      border-radius: 30px;
      box-shadow: 0 10px 20px rgba(79, 70, 229, 0.25);
      transition: all 0.25s ease;
    }
    .btn-main-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 15px 25px rgba(79, 70, 229, 0.35);
    }
    .btn-sub-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 28px;
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      text-decoration: none;
      font-weight: 600;
      font-size: 1rem;
      border-radius: 30px;
      transition: all 0.2s ease;
    }
    .btn-sub-cta:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #fdfdfd;
    }

    /* 指标卡片网格 */
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1040px;
      margin: 0 auto;
    }
    .stat-card {
      background: #ffffff;
      border: 1px solid rgba(226, 232, 240, 0.8);
      border-radius: var(--radius);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .stat-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .stat-num {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 通用Section布局 */
    .page-section {
      padding: 70px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    }
    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: var(--accent-warm);
      background: rgba(244, 63, 94, 0.08);
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* 平台介绍 */
    .about-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .about-lead {
      font-size: 1.1rem;
      line-height: 1.8;
      color: var(--text-main);
      margin-bottom: 28px;
    }
    .about-features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .about-feature-item {
      background: #f8fafc;
      border-radius: 8px;
      padding: 20px;
      border-left: 4px solid var(--primary-light);
    }
    .about-feature-item h3 {
      font-size: 1.05rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .about-feature-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 模型矩阵标签云 */
    .models-cloud-wrap {
      margin-top: 30px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
    }
    .models-cloud-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 14px;
      text-transform: uppercase;
    }
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }
    .model-tag {
      background: #f1f5f9;
      color: var(--text-main);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.88rem;
      font-weight: 500;
      border: 1px solid #e2e8f0;
      transition: all 0.2s;
    }
    .model-tag:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* 服务与场景卡片网格 */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: all 0.25s ease;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(99, 102, 241, 0.4);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(6, 182, 212, 0.1));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      color: var(--primary);
      margin-bottom: 18px;
    }
    .service-card h3 {
      font-size: 1.15rem;
      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;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .card-footer-link {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .card-footer-link:hover {
      text-decoration: underline;
    }

    /* 对比评测卡片与表格 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 36px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }
    .eval-score-wrap {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .score-big {
      font-size: 3.5rem;
      font-weight: 900;
      line-height: 1;
      color: #38bdf8;
    }
    .score-meta h4 {
      font-size: 1.3rem;
      margin-bottom: 4px;
      color: #ffffff;
    }
    .stars {
      color: #fbbf24;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }
    .eval-desc {
      max-width: 500px;
      font-size: 0.95rem;
      color: #cbd5e1;
      line-height: 1.6;
    }
    .table-container {
      background: #ffffff;
      border-radius: var(--radius);
      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: 0.95rem;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .highlight-col {
      background: rgba(99, 102, 241, 0.03);
      font-weight: 600;
      color: var(--primary);
    }
    .badge-check {
      color: #10b981;
      font-weight: 700;
    }

    /* 流程步骤 */
    .flow-steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .flow-step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .step-number {
      font-size: 2rem;
      font-weight: 900;
      color: rgba(99, 102, 241, 0.2);
      line-height: 1;
      margin-bottom: 12px;
    }
    .flow-step-card h3 {
      font-size: 1.05rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .flow-step-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 案例展示 */
    .media-showcase-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    .media-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .media-card-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #f1f5f9;
    }
    .media-card-img-wrap.square {
      aspect-ratio: 1 / 1;
    }
    .media-card-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    .media-card:hover .media-card-img-wrap img {
      transform: scale(1.03);
    }
    .media-card-body {
      padding: 20px;
    }
    .media-card-body h3 {
      font-size: 1.05rem;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .media-card-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 用户评论 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-quote {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 12px;
    }
    .author-avatar-badge {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-light), var(--accent));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }
    .author-info h4 {
      font-size: 0.95rem;
      color: var(--text-main);
    }
    .author-info p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-accordion {
      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: 8px;
      overflow: hidden;
      transition: border-color 0.2s;
    }
    .faq-item.open {
      border-color: var(--primary-light);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: none;
      border: none;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.2s ease;
      color: var(--primary);
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #f8fafc;
    }
    .faq-answer-inner {
      padding: 16px 24px 20px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 需求匹配与联系我们表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .contact-info-col h3 {
      font-size: 1.35rem;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .contact-info-col p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 24px;
    }
    .contact-details-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-bottom: 24px;
    }
    .contact-details-list li {
      font-size: 0.92rem;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .qr-container {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 16px;
      background: #f8fafc;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }
    .qr-container img {
      width: 100px;
      height: 100px;
      border-radius: 6px;
      object-fit: cover;
    }
    .qr-desc h4 {
      font-size: 0.95rem;
      margin-bottom: 4px;
      color: var(--text-main);
    }
    .qr-desc p {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin: 0;
    }

    /* 表单组件 */
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 10px 14px;
      font-size: 0.92rem;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      background: #ffffff;
      color: var(--text-main);
      transition: border-color 0.2s;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }
    .btn-submit {
      width: 100%;
      padding: 12px;
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: #ffffff;
      border: none;
      border-radius: 6px;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      transition: opacity 0.2s;
    }
    .btn-submit:hover {
      opacity: 0.92;
    }

    /* 文章列表 & 百科板块 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }
    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 18px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      text-decoration: none;
      color: var(--text-main);
      transition: all 0.2s;
    }
    .article-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }
    .article-title {
      font-weight: 600;
      font-size: 0.95rem;
    }
    .article-arrow {
      color: var(--primary);
      font-weight: 700;
    }

    /* 加盟代理板块 */
    .partner-banner {
      background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }
    .partner-banner-text h3 {
      font-size: 1.5rem;
      margin-bottom: 8px;
      color: #ffffff;
    }
    .partner-banner-text p {
      font-size: 0.95rem;
      color: #cbd5e1;
      max-width: 600px;
    }

    /* 友情链接与页脚 */
    .footer-section {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 20px;
    }
    .footer-links-wrap {
      margin-bottom: 30px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--border-color);
    }
    .footer-links-title {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 12px;
    }
    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.88rem;
    }
    .friend-links-list a {
      color: var(--text-muted);
      text-decoration: none;
    }
    .friend-links-list a:hover {
      color: var(--primary);
      text-decoration: underline;
    }
    .footer-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .ai-page-home-link {
      color: var(--primary);
      text-decoration: none;
      font-weight: 600;
    }

    /* 悬浮客服挂件 */
    .float-contact {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(67, 56, 202, 0.35);
      cursor: pointer;
      text-decoration: none;
      border: none;
      font-size: 1.2rem;
      transition: transform 0.2s;
    }
    .float-btn:hover {
      transform: scale(1.08);
    }
    .back-to-top {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      display: none;
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.2rem; }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .cards-grid-3, .about-features-grid, .media-showcase-grid, .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
      .flow-steps-grid { grid-template-columns: repeat(2, 1fr); }
      .contact-wrapper { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 20px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.open { display: flex; }
      .nav-links li { width: 100%; }
      .nav-links li a { width: 100%; padding: 10px 0; }
      .hero-title { font-size: 1.75rem; }
      .hero-stats-grid { grid-template-columns: 1fr; }
      .cards-grid-3, .about-features-grid, .media-showcase-grid, .testimonials-grid, .articles-grid { grid-template-columns: 1fr; }
      .flow-steps-grid { grid-template-columns: 1fr; }
      .eval-highlight-box, .partner-banner { flex-direction: column; align-items: flex-start; }
      .footer-bottom { flex-direction: column; align-items: flex-start; }
    }