:root {
      --primary: #FF5A00;
      --primary-hover: #E04D00;
      --primary-light: #FFF4ED;
      --primary-glow: rgba(255, 90, 0, 0.16);
      --secondary: #FF8533;
      --dark: #1E2329;
      --text: #2D3748;
      --text-muted: #64748B;
      --bg: #FBFBFB;
      --card-bg: #FFFFFF;
      --border: #F0E6DF;
      --shadow-sm: 0 4px 12px rgba(255, 90, 0, 0.05);
      --shadow-md: 0 8px 24px rgba(255, 90, 0, 0.08);
      --shadow-lg: 0 16px 36px rgba(255, 90, 0, 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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    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, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }

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

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

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

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text);
      padding: 8px 14px;
      border-radius: 6px;
    }

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

    .header-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: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #FF7A00 100%);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(255, 90, 0, 0.3);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary) 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 90, 0, 0.4);
    }

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

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

    .btn-sm {
      padding: 6px 14px;
      font-size: 0.85rem;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--dark);
      margin: 5px 0;
      transition: all 0.3s ease;
    }

    /* 首屏纯文字与几何美学 - 无图片 */
    .hero-section {
      position: relative;
      background: radial-gradient(circle at 80% 20%, #FFF5ED 0%, #FAF6F3 60%, #F8F9FA 100%);
      padding: 90px 0 70px;
      overflow: hidden;
      border-bottom: 1px solid var(--border);
    }

    .hero-section::before {
      content: "";
      position: absolute;
      width: 500px;
      height: 500px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(255,90,0,0.08) 0%, rgba(255,255,255,0) 70%);
      top: -100px;
      right: -50px;
      pointer-events: none;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      background: var(--primary-light);
      border: 1px solid rgba(255, 90, 0, 0.2);
      border-radius: 30px;
      color: var(--primary);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--dark);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title .highlight {
      background: linear-gradient(135deg, #FF4500 0%, #FF8533 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-desc {
      font-size: 1.18rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.7;
    }

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

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      background: #FFFFFF;
      padding: 24px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border);
    }

    .metric-item {
      text-align: center;
      position: relative;
    }

    .metric-item:not(:last-child)::after {
      content: "";
      position: absolute;
      right: 0;
      top: 20%;
      height: 60%;
      width: 1px;
      background-color: var(--border);
    }

    .metric-number {
      font-size: 1.85rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 4px;
      font-family: inherit;
    }

    .metric-label {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 通用模块结构 */
    .section {
      padding: 85px 0;
      position: relative;
    }

    .section-alt {
      background-color: #FFFFFF;
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 50px;
    }

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

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 1.02rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 平台核心能力网格 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #FFFFFF;
      padding: 30px;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(255, 90, 0, 0.4);
    }

    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
      font-weight: bold;
    }

    .service-title {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 10px;
    }

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

    .service-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 16px;
    }

    .service-tag-item {
      font-size: 0.76rem;
      background: #F4F6F8;
      color: #556987;
      padding: 3px 8px;
      border-radius: 4px;
    }

    /* 场景矩阵多列卡片 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
    }

    .scenario-card {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 20px;
      transition: all 0.25s ease;
    }

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

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

    .scenario-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary);
    }

    .scenario-title {
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--dark);
    }

    .scenario-text {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 支持模型滚动/标签展示 */
    .models-chip-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 24px;
    }

    .model-chip {
      background: #FFFFFF;
      border: 1px solid #E2E8F0;
      padding: 7px 16px;
      border-radius: 20px;
      font-size: 0.88rem;
      color: #4A5568;
      font-weight: 500;
      box-shadow: 0 2px 4px rgba(0,0,0,0.02);
      transition: all 0.2s ease;
    }

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

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

    .flow-card {
      background: #FFFFFF;
      padding: 26px 20px;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      position: relative;
      text-align: center;
    }

    .flow-num {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: var(--primary);
      color: #FFFFFF;
      font-weight: 700;
      font-size: 1.1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
    }

    .flow-title {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 8px;
    }

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

    /* 案例与素材图展示 - 首屏外 */
    .case-gallery {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
      align-items: stretch;
      margin-bottom: 30px;
    }

    .case-banner-img {
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      height: 100%;
      min-height: 280px;
    }

    .case-banner-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .case-sub-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 20px;
    }

    .case-sub-item {
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      height: 100%;
    }

    .case-sub-item img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* 对比评测表格与卡片 */
    .compare-section {
      background: #FFFFFF;
    }

    .score-card {
      background: linear-gradient(135deg, #FFF6F0 0%, #FFFFFF 100%);
      border: 2px solid #FFD4BC;
      border-radius: var(--radius);
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      box-shadow: var(--shadow-sm);
    }

    .score-info h3 {
      font-size: 1.45rem;
      color: var(--dark);
      margin-bottom: 6px;
    }

    .score-info p {
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    .score-rating {
      text-align: right;
    }

    .stars {
      color: #FF5A00;
      font-size: 1.6rem;
      letter-spacing: 2px;
    }

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

    .score-max {
      font-size: 1.1rem;
      color: var(--text-muted);
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      background: #FFFFFF;
    }

    .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 #EDF2F7;
      font-size: 0.93rem;
    }

    .compare-table th {
      background-color: #F8FAFC;
      color: var(--dark);
      font-weight: 600;
    }

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

    .compare-table td.brand-col {
      color: var(--primary);
      font-weight: 600;
      background-color: #FFFDFB;
    }

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

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

    .review-text {
      font-size: 0.92rem;
      color: #4A5568;
      line-height: 1.6;
      margin-bottom: 20px;
      font-style: italic;
    }

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #F1F5F9;
      padding-top: 14px;
    }

    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #FFE8D6;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .reviewer-name {
      font-weight: 600;
      font-size: 0.95rem;
      color: var(--dark);
    }

    .reviewer-title {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: 8px;
      overflow: hidden;
      transition: all 0.2s ease;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      padding: 18px 22px;
      font-size: 1rem;
      font-weight: 600;
      color: var(--dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
      color: var(--primary);
    }

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

    .faq-answer-inner {
      padding: 0 22px 18px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px solid #F8FAFC;
    }

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

    /* 最新文章与资讯 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

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

    .article-item:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
      box-shadow: var(--shadow-sm);
    }

    .article-title {
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 10px;
    }

    .article-snippet {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .article-link {
      font-size: 0.88rem;
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 表单与需求匹配 */
    .form-container {
      max-width: 760px;
      margin: 0 auto;
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
      margin-bottom: 18px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

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

    .form-label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--dark);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #D9E2EC;
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--dark);
      background-color: #FAFAFA;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background-color: #FFFFFF;
    }

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

    /* 加盟代理板块 */
    .partner-banner {
      background: linear-gradient(135deg, #1E2329 0%, #2D3748 100%);
      color: #FFFFFF;
      border-radius: var(--radius);
      padding: 48px 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
    }

    .partner-content h3 {
      font-size: 1.8rem;
      margin-bottom: 10px;
      font-weight: 700;
      color: #FFFFFF;
    }

    .partner-content p {
      color: #CBD5E1;
      font-size: 0.98rem;
      max-width: 600px;
      line-height: 1.6;
    }

    /* 页脚 */
    .footer {
      background-color: #181C20;
      color: #A0AEC0;
      padding: 60px 0 30px;
      border-top: 4px solid var(--primary);
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 36px;
      padding-bottom: 40px;
      border-bottom: 1px solid #2D3748;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1.05rem;
      font-weight: 600;
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links a {
      color: #A0AEC0;
      font-size: 0.9rem;
    }

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

    .contact-item {
      font-size: 0.88rem;
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: #CBD5E1;
    }

    .qrcode-box {
      width: 100px;
      height: 100px;
      background: #FFFFFF;
      padding: 6px;
      border-radius: 6px;
      margin-top: 10px;
    }

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

    .footer-bottom {
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 14px;
      font-size: 0.85rem;
      color: #718096;
    }

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

    .friend-links a {
      color: #718096;
    }

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

    /* 浮动侧边客服 */
    .floating-widget {
      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: #FFFFFF;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      font-size: 1.2rem;
      position: relative;
      transition: all 0.2s ease;
    }

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

    .float-qr-pop {
      display: none;
      position: absolute;
      right: 58px;
      bottom: 0;
      background: #FFFFFF;
      padding: 12px;
      border-radius: 8px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border);
      text-align: center;
      width: 140px;
    }

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

    .float-qr-pop img {
      width: 100%;
      height: auto;
      margin-bottom: 6px;
    }

    .float-qr-pop span {
      font-size: 0.78rem;
      color: var(--dark);
      display: block;
    }

    /* 响应式样式适配 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .service-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .scenario-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-gallery {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
      }
      .metric-item:nth-child(2)::after {
        display: none;
      }
    }

    @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);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        text-align: center;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .service-grid,
      .scenario-grid,
      .testimonial-grid,
      .articles-grid {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .partner-banner {
        flex-direction: column;
        text-align: center;
      }
      .score-card {
        flex-direction: column;
        gap: 16px;
        text-align: center;
      }
      .score-rating {
        text-align: center;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }