:root {
      --primary: #ff5500;
      --primary-hover: #e04b00;
      --primary-light: #fff3eb;
      --primary-glow: rgba(255, 85, 0, 0.15);
      --secondary: #ff8c00;
      --dark: #1f2329;
      --dark-light: #333842;
      --gray: #646a73;
      --gray-light: #f5f6f7;
      --border: #dee0e3;
      --white: #ffffff;
      --radius: 8px;
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow: 0 8px 24px rgba(255, 85, 0, 0.08);
      --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.08);
    }

    * {
      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", "WenQuanYi Micro Hei", sans-serif;
      line-height: 1.6;
      color: var(--dark);
      background-color: #fafbfc;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

    ul, ol {
      list-style: none;
    }

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

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

    /* 顶部导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(255, 85, 0, 0.12);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

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

    .brand img.ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--dark);
      letter-spacing: -0.5px;
    }

    .brand-name span {
      color: var(--primary);
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--dark);
      padding: 8px 14px;
      border-radius: var(--radius);
      white-space: nowrap;
    }

    .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 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius);
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: var(--white) !important;
      box-shadow: 0 4px 14px rgba(255, 85, 0, 0.28);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary) 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 85, 0, 0.36);
    }

    .btn-outline {
      border-color: var(--primary);
      color: var(--primary) !important;
      background: transparent;
    }

    .btn-outline:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    .btn-white {
      background: #ffffff;
      color: var(--primary) !important;
      border: 1px solid #ffd8bf;
    }

    .btn-white:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--dark);
      cursor: pointer;
      padding: 4px;
    }

    /* 通用区块与标题 */
    .section {
      padding: 72px 0;
      position: relative;
    }

    .section-alt {
      background-color: #ffffff;
      border-top: 1px solid #f0f0f0;
      border-bottom: 1px solid #f0f0f0;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: var(--primary-light);
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: 20px;
      margin-bottom: 12px;
      border: 1px solid rgba(255, 85, 0, 0.2);
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-title span {
      color: var(--primary);
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--gray);
      line-height: 1.6;
    }

    /* 首屏 Hero (无图片，纯色彩/几何质感) */
    .hero {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 80% 20%, #fff0e6 0%, #fafbfc 60%), linear-gradient(180deg, #ffffff 0%, #fafbfc 100%);
      border-bottom: 1px solid rgba(255, 85, 0, 0.08);
      position: relative;
      overflow: hidden;
    }

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

    .hero h1 {
      font-size: 2.7rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--dark);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero h1 span {
      background: linear-gradient(135deg, var(--primary) 0%, #ff8c00 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-lead {
      font-size: 1.15rem;
      color: var(--dark-light);
      line-height: 1.7;
      margin-bottom: 32px;
    }

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

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

    .stat-card {
      background: #ffffff;
      border: 1px solid rgba(255, 85, 0, 0.15);
      border-radius: var(--radius);
      padding: 20px 24px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow);
      border-color: var(--primary);
    }

    .stat-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
      line-height: 1.2;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--gray);
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

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

    .card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      padding: 28px;
      transition: all 0.25s ease;
      position: relative;
    }

    .card:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
      box-shadow: var(--shadow);
    }

    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--dark);
    }

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

    /* 模型矩阵徽章云 */
    .model-tags-wrap {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 28px;
      margin-top: 30px;
    }

    .model-tags-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--dark);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .model-tags-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .model-tag {
      background: var(--gray-light);
      border: 1px solid #e5e6eb;
      padding: 6px 14px;
      font-size: 0.85rem;
      border-radius: 4px;
      color: var(--dark);
      font-weight: 500;
      transition: all 0.2s;
    }

    .model-tag:hover {
      background: var(--primary-light);
      border-color: var(--primary);
      color: var(--primary);
    }

    /* 场景与能力矩阵 */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .scene-card {
      background: #ffffff;
      border: 1px solid #eceff2;
      border-radius: var(--radius);
      padding: 22px;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .scene-card:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
      box-shadow: 0 6px 16px rgba(255, 85, 0, 0.08);
    }

    .scene-head {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 10px;
    }

    .scene-badge {
      font-size: 0.75rem;
      padding: 2px 8px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 4px;
      font-weight: 600;
    }

    .scene-head h4 {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--dark);
    }

    .scene-card p {
      font-size: 0.9rem;
      color: var(--gray);
      line-height: 1.5;
      margin-bottom: 12px;
    }

    .scene-feature {
      font-size: 0.82rem;
      color: #86909c;
      border-top: 1px dashed #f0f0f0;
      padding-top: 8px;
    }

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

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }

    .step-num {
      font-size: 2rem;
      font-weight: 900;
      color: rgba(255, 85, 0, 0.15);
      position: absolute;
      top: 12px;
      right: 16px;
      line-height: 1;
    }

    .step-card h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--dark);
    }

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

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

    .case-banner-box {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .case-media {
      width: 100%;
      background: #f0f2f5;
      overflow: hidden;
    }

    .case-media img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      transition: transform 0.3s;
    }

    .case-banner-box:hover .case-media img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 20px;
    }

    .case-info h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .case-info p {
      font-size: 0.9rem;
      color: var(--gray);
    }

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

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

    .gallery-item img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    .gallery-desc {
      padding: 12px 16px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--dark);
    }

    /* 对比评测表格 */
    .compare-wrap {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

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

    .compare-table th, 
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f0f0f0;
      font-size: 0.95rem;
    }

    .compare-table th {
      background: #fafbfc;
      font-weight: 700;
      color: var(--dark);
    }

    .compare-table th.highlight,
    .compare-table td.highlight {
      background: #fff8f5;
      color: var(--primary);
      font-weight: 600;
    }

    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: linear-gradient(135deg, var(--primary) 0%, #ff8c00 100%);
      color: #ffffff;
      padding: 6px 14px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 0.9rem;
    }

    /* 用户评论 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.95rem;
      color: var(--dark-light);
      line-height: 1.6;
      margin-bottom: 16px;
      position: relative;
    }

    .reviewer {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f0f0f0;
      padding-top: 14px;
    }

    .reviewer-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: 1rem;
    }

    .reviewer-info h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--dark);
    }

    .reviewer-info span {
      font-size: 0.8rem;
      color: var(--gray);
    }

    /* 常见问题 FAQ 折叠面板 */
    .faq-list {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
      transition: all 0.2s ease;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--dark);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      color: var(--gray);
      transition: transform 0.25s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 24px;
      background: #fafbfc;
    }

    .faq-answer p {
      padding: 16px 0;
      font-size: 0.95rem;
      color: var(--dark-light);
      line-height: 1.6;
      border-top: 1px dashed #e5e6eb;
    }

    /* 需求表单与代理专区 */
    .form-box {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      font-size: 0.95rem;
      color: var(--dark);
      outline: none;
      transition: border-color 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(255, 85, 0, 0.1);
    }

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

    /* 最新文章与资讯 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 16px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.2s ease;
    }

    .article-item:hover {
      border-color: var(--primary);
      padding-left: 24px;
      background: var(--primary-light);
    }

    .article-item a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--dark);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* 友情链接与生态 */
    .links-box {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      margin-top: 30px;
    }

    .links-title {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--dark);
    }

    .links-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .links-flex a {
      font-size: 0.9rem;
      color: var(--gray);
      background: var(--gray-light);
      padding: 6px 14px;
      border-radius: 4px;
    }

    .links-flex a:hover {
      color: var(--primary);
      background: var(--primary-light);
    }

    /* 页脚 */
    .footer {
      background: #ffffff;
      border-top: 1px solid #e5e6eb;
      padding: 48px 0 24px;
      color: var(--dark-light);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-brand h4 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      color: var(--gray);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .footer-qr {
      width: 100px;
      border: 1px solid #eee;
      border-radius: 4px;
      padding: 4px;
      background: #fff;
    }

    .footer-col h5 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 14px;
    }

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

    .footer-col ul li a {
      font-size: 0.9rem;
      color: var(--gray);
    }

    .footer-col ul li a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid #f0f0f0;
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--gray);
    }

    /* 浮动工具栏 */
    .float-toolbar {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--dark);
      cursor: pointer;
      font-size: 1.1rem;
      transition: all 0.25s ease;
      position: relative;
    }

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

    .float-qr-pop {
      position: absolute;
      right: 56px;
      top: -30px;
      width: 140px;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 10px;
      box-shadow: var(--shadow-lg);
      display: none;
      text-align: center;
    }

    .float-qr-pop p {
      font-size: 0.8rem;
      color: var(--dark);
      margin-top: 6px;
    }

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

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero h1 {
        font-size: 2.2rem;
      }
      .grid-3, .scene-grid, .review-grid, .banner-gallery {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4, .hero-stats-grid, .step-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 20px;
        display: none;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-menu.active {
        display: flex;
      }
      .nav-links {
        flex-direction: column;
        width: 100%;
        align-items: flex-start;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
      }
      .nav-actions {
        width: 100%;
        margin-top: 16px;
        flex-direction: column;
      }
      .nav-actions .btn {
        width: 100%;
      }
      .hero h1 {
        font-size: 1.8rem;
      }
      .grid-3, .grid-2, .grid-4, .scene-grid, .review-grid, .hero-stats-grid, .step-grid, .banner-gallery {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .compare-wrap {
        overflow-x: auto;
      }
    }