:root {
      --primary: #ff5500;
      --primary-hover: #e04b00;
      --primary-light: #fff2eb;
      --primary-subtle: #ffe6d8;
      --secondary: #ff8a00;
      --accent: #d93800;
      --bg-main: #fdfbf9;
      --bg-card: #ffffff;
      --bg-alt: #f7f3ee;
      --text-dark: #1b1e24;
      --text-muted: #5f6573;
      --text-sub: #8b92a0;
      --border: #f0e6dd;
      --border-focus: #ff7e40;
      --shadow-sm: 0 2px 8px rgba(255, 85, 0, 0.04), 0 1px 3px rgba(0,0,0,0.03);
      --shadow-md: 0 8px 24px rgba(255, 85, 0, 0.08), 0 2px 6px rgba(0,0,0,0.04);
      --shadow-lg: 0 16px 40px rgba(255, 85, 0, 0.12), 0 4px 12px rgba(0,0,0,0.05);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-dark);
      line-height: 1.6;
    }
    body {
      background-color: var(--bg-main);
      color: var(--text-dark);
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    .site-container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    .section-padding {
      padding-top: 80px;
      padding-bottom: 80px;
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }
    .badge-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: var(--primary-light);
      color: var(--accent);
      border: 1px solid var(--primary-subtle);
      padding: 4px 14px;
      border-radius: 99px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-dark);
      line-height: 1.3;
      margin-bottom: 14px;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #ffffff;
      box-shadow: 0 4px 16px rgba(255, 85, 0, 0.3);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
      box-shadow: 0 6px 20px rgba(255, 85, 0, 0.4);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: #ffffff;
      color: var(--primary);
      border-color: var(--border);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      background: var(--primary-light);
      color: var(--accent);
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      transition: var(--transition);
    }
    .nav-wrap {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }
    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-text {
      font-size: 20px;
      font-weight: 800;
      color: var(--text-dark);
      letter-spacing: -0.5px;
    }
    .brand-text span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: 6px;
      white-space: nowrap;
    }
    .nav-links li a:hover {
      color: var(--primary);
      background: var(--primary-light);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }
    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: 1px solid var(--border);
      border-radius: 6px;
      padding: 6px 10px;
      cursor: pointer;
      color: var(--text-dark);
    }

    /* 首屏 Hero (无图片) */
    .hero-section {
      padding: 80px 0 90px 0;
      background: radial-gradient(circle at 50% 10%, #fff0e8 0%, var(--bg-main) 70%);
      border-bottom: 1px solid var(--border);
      position: relative;
    }
    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }
    .hero-h1 {
      font-size: 44px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-dark);
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }
    .hero-h1 .gradient-text {
      background: linear-gradient(135deg, #d93800 0%, #ff5500 50%, #ff8a00 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 34px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .hero-cta-group .btn-hero-main {
      padding: 16px 36px;
      font-size: 16px;
      font-weight: 700;
      border-radius: var(--radius-sm);
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: left;
    }
    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border-top: 3px solid var(--primary);
    }
    .stat-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .stat-value {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台矩阵标签云 */
    .model-matrix-bar {
      background: #ffffff;
      border-bottom: 1px solid var(--border);
      padding: 24px 0;
    }
    .matrix-title {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-sub);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 14px;
      text-align: center;
    }
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px 12px;
    }
    .model-tag {
      background: var(--bg-alt);
      border: 1px solid var(--border);
      padding: 5px 12px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 600;
      color: var(--text-dark);
      transition: var(--transition);
    }
    .model-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-light);
    }

    /* 服务能力卡片 */
    .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: 28px;
    }
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .feature-card:hover {
      border-color: var(--border-focus);
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .feature-icon-box {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 20px;
      font-weight: bold;
    }
    .feature-card h3 {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 10px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

    /* 场景大卡片 */
    .scenario-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .scenario-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
    }
    .scenario-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
      background: var(--primary-light);
      padding: 2px 10px;
      border-radius: 4px;
      margin-bottom: 12px;
    }
    .scenario-card h4 {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }
    .scenario-card p {
      font-size: 13.5px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 图文素材展示区 */
    .media-showcase-box {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      margin-top: 40px;
    }
    .media-grid-row {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: center;
    }
    .img-wrap {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      background: var(--bg-alt);
    }
    .img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
    }
    .img-wrap img:hover {
      transform: scale(1.02);
    }

    /* 评测对比表格 */
    .eval-box {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .score-banner {
      background: linear-gradient(135deg, #fff5f0 0%, #ffece0 100%);
      border: 1px solid var(--primary-subtle);
      border-radius: var(--radius-md);
      padding: 24px 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 20px;
    }
    .score-left h3 {
      font-size: 20px;
      font-weight: 800;
      color: var(--text-dark);
      margin-bottom: 6px;
    }
    .score-stars {
      color: #ff9800;
      font-size: 20px;
      letter-spacing: 2px;
    }
    .score-right {
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    .score-num {
      font-size: 44px;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }
    .score-max {
      font-size: 16px;
      color: var(--text-muted);
      font-weight: 600;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
      font-size: 14px;
    }
    .custom-table th {
      background: var(--bg-alt);
      color: var(--text-dark);
      font-weight: 700;
    }
    .custom-table td.highlight {
      background: #fff9f6;
      color: var(--primary);
      font-weight: 700;
    }

    /* 流程时间线 */
    .process-timeline {
      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-md);
      padding: 24px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .step-num {
      font-size: 32px;
      font-weight: 900;
      color: var(--primary-subtle);
      line-height: 1;
      margin-bottom: 12px;
    }
    .step-card h4 {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }
    .step-card p {
      font-size: 13.5px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 用户评论 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .test-text {
      font-size: 14.5px;
      color: var(--text-dark);
      line-height: 1.7;
      margin-bottom: 20px;
      position: relative;
      font-style: normal;
    }
    .test-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border);
      padding-top: 16px;
    }
    .test-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }
    .test-meta h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-dark);
    }
    .test-meta p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item.active {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-dark);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-icon {
      font-size: 18px;
      font-weight: bold;
      color: var(--primary);
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      background: #fffbf8;
      border-top: 1px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 500px;
      border-top: 1px solid var(--border);
      transition: max-height 0.35s ease-in-out;
    }
    .faq-answer-inner {
      padding: 18px 24px;
      font-size: 14.5px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 表单与联系区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .contact-info-side {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .contact-item-group {
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }
    .c-icon {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      font-weight: bold;
      flex-shrink: 0;
    }
    .c-text h5 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 2px;
    }
    .c-text p {
      font-size: 13.5px;
      color: var(--text-muted);
    }
    .qr-block {
      margin-top: 24px;
      padding: 16px;
      background: var(--bg-alt);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      gap: 16px;
      border: 1px solid var(--border);
    }
    .qr-block img {
      width: 90px;
      height: 90px;
      border-radius: 6px;
      border: 1px solid var(--border);
      background: #fff;
    }
    .form-side form {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group label {
      font-size: 13.5px;
      font-weight: 600;
      color: var(--text-dark);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: var(--bg-main);
      color: var(--text-dark);
      transition: var(--transition);
      font-family: inherit;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px var(--primary-subtle);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* 资讯与百科链接区 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .article-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .article-card:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
      box-shadow: var(--shadow-sm);
    }
    .article-card h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .article-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .article-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 友情链接与底部 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border);
      padding-top: 50px;
      padding-bottom: 30px;
      margin-top: auto;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h5 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 16px;
    }
    .footer-col p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links li a {
      font-size: 13.5px;
      color: var(--text-muted);
    }
    .footer-links li a:hover {
      color: var(--primary);
    }
    .friend-links-box {
      border-top: 1px solid var(--border);
      padding-top: 24px;
      margin-bottom: 24px;
    }
    .friend-links-title {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-sub);
      margin-bottom: 12px;
    }
    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px 20px;
    }
    .friend-links-list a {
      font-size: 13px;
      color: var(--text-muted);
    }
    .friend-links-list a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid var(--border);
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .copyright {
      font-size: 12.5px;
      color: var(--text-sub);
    }

    /* 浮动客服 */
    .float-widget {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary);
      border: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      transition: var(--transition);
      font-size: 18px;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
      .articles-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .section-padding {
        padding-top: 50px;
        padding-bottom: 50px;
      }
      .hero-h1 {
        font-size: 28px;
      }
      .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.show {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .grid-3, .grid-2, .articles-grid {
        grid-template-columns: 1fr;
      }
      .media-grid-row {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .eval-box {
        padding: 20px;
      }
      .footer-top {
        grid-template-columns: 1fr;
        gap: 24px;
      }
    }