:root {
      --primary: #FF5A1F;
      --primary-dark: #E0430B;
      --primary-light: #FFF2EB;
      --primary-gradient: linear-gradient(135deg, #FF5A1F 0%, #FF8A00 100%);
      --accent: #FF8A00;
      --dark-title: #1E2024;
      --dark-text: #4A4D55;
      --light-text: #7A7E8A;
      --bg-light: #FDFDFE;
      --bg-alt: #F8F9FA;
      --bg-warm: #FFF9F5;
      --card-bg: #FFFFFF;
      --border: #EAEAEA;
      --border-focus: #FFC0A3;
      --shadow-sm: 0 4px 12px rgba(255, 90, 31, 0.05);
      --shadow-md: 0 8px 24px rgba(255, 90, 31, 0.08);
      --shadow-lg: 0 16px 36px rgba(255, 90, 31, 0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --container-max: 1200px;
      --transition: all 0.28s ease;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-light);
      color: var(--dark-text);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background-color: var(--bg-light);
    }

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

    ul, ol {
      list-style: none;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    .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);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

    .logo-container {
      display: flex;
      align-items: center;
      gap: 12px;
      height: 48px;
    }

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

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

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

    .nav-link-item {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--dark-title);
      border-radius: var(--radius-sm);
    }

    .nav-link-item:hover {
      color: var(--primary);
      background-color: 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-full);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      line-height: 1.2;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(255, 90, 31, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(255, 90, 31, 0.45);
      color: #FFFFFF;
    }

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

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

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

    /* Hero 首屏 - 无图片设计，炽艳纯色与渐变氛围 */
    .hero-section {
      background: radial-gradient(circle at 50% -20%, rgba(255, 90, 31, 0.15), transparent 70%), var(--bg-light);
      padding: 70px 0 60px;
      text-align: center;
      border-bottom: 1px solid var(--border);
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: var(--primary-light);
      border: 1px solid rgba(255, 90, 31, 0.3);
      border-radius: var(--radius-full);
      color: var(--primary);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.6rem;
      font-weight: 900;
      color: var(--dark-title);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

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

    .hero-desc {
      font-size: 1.15rem;
      color: var(--light-text);
      max-width: 800px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

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

    .hero-btn-main {
      font-size: 1.1rem;
      padding: 14px 34px;
      background: var(--primary-gradient);
      color: #FFF;
      box-shadow: 0 6px 20px rgba(255, 90, 31, 0.4);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .hero-stat-card {
      background: #FFFFFF;
      border: 1px solid var(--border);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border-top: 3px solid var(--primary);
    }

    .hero-stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .hero-stat-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
    }

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

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

    .section-alt {
      background-color: var(--bg-alt);
    }

    .section-warm {
      background-color: var(--bg-warm);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      background: var(--primary-light);
      padding: 4px 12px;
      border-radius: var(--radius-sm);
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--dark-title);
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--light-text);
      line-height: 1.6;
    }

    /* 网格与卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

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

    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

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

    .feature-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
    }

    .feature-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--dark-title);
      margin-bottom: 10px;
    }

    .feature-desc {
      font-size: 0.92rem;
      color: var(--dark-text);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 平台矩阵标签云 */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: #FFFFFF;
      border: 1px solid var(--border);
      padding: 8px 18px;
      border-radius: var(--radius-full);
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--dark-title);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

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

    .step-item {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-badge {
      font-size: 1.6rem;
      font-weight: 900;
      color: var(--primary);
      opacity: 0.8;
      margin-bottom: 12px;
    }

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

    .step-desc {
      font-size: 0.9rem;
      color: var(--light-text);
      line-height: 1.5;
    }

    /* 对比表格 */
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

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

    .compare-table th {
      background: var(--bg-alt);
      color: var(--dark-title);
      font-weight: 700;
    }

    .compare-table th.highlight, .compare-table td.highlight {
      background: var(--primary-light);
      color: var(--primary-dark);
      font-weight: 700;
    }

    .score-banner {
      background: var(--primary-gradient);
      color: #FFFFFF;
      padding: 24px;
      border-radius: var(--radius-md);
      display: flex;
      justify-content: space-around;
      align-items: center;
      margin-bottom: 30px;
      box-shadow: var(--shadow-md);
      flex-wrap: wrap;
      gap: 16px;
    }

    .score-item {
      text-align: center;
    }

    .score-val {
      font-size: 2.2rem;
      font-weight: 900;
      line-height: 1.1;
    }

    .score-lbl {
      font-size: 0.9rem;
      opacity: 0.9;
      font-weight: 500;
    }

    /* 案例展示 */
    .case-card {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: var(--bg-alt);
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

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

    .case-body {
      padding: 20px;
    }

    .case-tag {
      font-size: 0.8rem;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 6px;
    }

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

    .case-desc {
      font-size: 0.88rem;
      color: var(--light-text);
      line-height: 1.5;
    }

    /* 评论卡片 */
    .testimonial-card {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }

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

    .user-avatar {
      width: 44px;
      height: 44px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: var(--radius-full);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .user-meta h4 {
      font-size: 1rem;
      color: var(--dark-title);
      font-weight: 700;
    }

    .user-meta span {
      font-size: 0.82rem;
      color: var(--light-text);
    }

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

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-header {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      color: var(--dark-title);
      user-select: none;
      background: #FFFFFF;
      font-size: 1.02rem;
    }

    .faq-header:hover {
      color: var(--primary);
      background: var(--bg-warm);
    }

    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.28s ease;
    }

    .faq-body {
      padding: 0 24px 20px;
      display: none;
      color: var(--dark-text);
      font-size: 0.95rem;
      line-height: 1.7;
      border-top: 1px solid #FAFAFA;
    }

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

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

    /* 表单与需求匹配 */
    .form-container {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 20px;
    }

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

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--dark-title);
      outline: none;
      transition: var(--transition);
      background: #FAFAFA;
      font-family: inherit;
    }

    .form-control:focus {
      background: #FFFFFF;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(255, 90, 31, 0.15);
    }

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

    /* 文章与资讯 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .article-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }

    .article-title {
      font-weight: 600;
      color: var(--dark-title);
      font-size: 0.98rem;
    }

    .article-link {
      font-size: 0.88rem;
      color: var(--primary);
      font-weight: 600;
    }

    /* 友情链接与页脚 */
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      padding: 20px;
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      margin-bottom: 40px;
    }

    .friend-links a {
      font-size: 0.9rem;
      color: var(--dark-text);
      padding: 4px 10px;
      background: var(--bg-alt);
      border-radius: var(--radius-sm);
    }

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

    .footer {
      background: #1A1C20;
      color: #E1E3E8;
      padding: 50px 0 20px;
      border-top: 3px solid var(--primary);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-col p, .footer-col li {
      font-size: 0.9rem;
      color: #A0A4B0;
      line-height: 1.8;
      margin-bottom: 8px;
    }

    .footer-col a {
      color: #A0A4B0;
    }

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

    .footer-qr {
      width: 110px;
      height: 110px;
      background: #FFFFFF;
      padding: 6px;
      border-radius: var(--radius-sm);
      margin-top: 10px;
    }

    .footer-bottom {
      border-top: 1px solid #2B2F38;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #7A7E8A;
    }

    /* 悬浮客服 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: var(--primary-gradient);
      color: #FFFFFF;
      border-radius: var(--radius-full);
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      cursor: pointer;
      font-weight: bold;
      font-size: 0.85rem;
      border: none;
      transition: var(--transition);
      text-align: center;
    }

    .float-btn:hover {
      transform: scale(1.08);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .grid-4, .hero-stats-grid, .steps-wrapper {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-title {
        font-size: 2.2rem;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 16px 20px;
        box-shadow: 0 8px 16px rgba(0,0,0,0.08);
        border-bottom: 1px solid var(--border);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-link-item {
        width: 100%;
        padding: 12px;
      }
      .grid-3, .grid-4, .hero-stats-grid, .steps-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .section {
        padding: 50px 0;
      }
    }