:root {
      --primary: #0052d9;
      --primary-hover: #003cab;
      --primary-light: #ecf2fe;
      --accent: #00a870;
      --warning: #ed7b2f;
      --text-main: #1d2129;
      --text-regular: #4e5969;
      --text-muted: #86909c;
      --bg-page: #f8fafc;
      --bg-white: #ffffff;
      --bg-card: #ffffff;
      --border-color: #e5e6eb;
      --border-light: #f2f3f5;
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(0, 82, 217, 0.08);
      --shadow-lg: 0 16px 36px rgba(0, 82, 217, 0.12);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition: all 0.28s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

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

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

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

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

    .brand-logo-wrap {
      width: 140px;
      display: flex;
      align-items: center;
    }

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

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

    .nav-links a:hover {
      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: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(0, 82, 217, 0.25);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 6px 18px rgba(0, 82, 217, 0.35);
      transform: translateY(-1px);
    }

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

    .btn-outline:hover {
      background-color: var(--primary-light);
    }

    .btn-hero-lg {
      padding: 14px 34px;
      font-size: 1.1rem;
      border-radius: var(--radius-md);
    }

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

    /* 纯色科技感首屏（禁止任何图片） */
    .hero-section {
      background: linear-gradient(135deg, #eef4ff 0%, #ffffff 50%, #f0fdf4 100%);
      padding: 80px 0 70px;
      position: relative;
      border-bottom: 1px solid var(--border-light);
    }

    .hero-content {
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid rgba(0, 82, 217, 0.2);
      border-radius: 30px;
      color: var(--primary);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 1.18rem;
      color: var(--text-regular);
      max-width: 780px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

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

    .stat-card {
      background: #ffffff;
      padding: 24px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }

    .stat-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
      border-color: rgba(0, 82, 217, 0.3);
    }

    .stat-value {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
    }

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

    /* 通用Section */
    .section {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-light);
    }

    .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);
      background-color: var(--primary-light);
      padding: 4px 14px;
      border-radius: 4px;
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-regular);
      line-height: 1.6;
    }

    /* 平台核心卡片与网格 */
    .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: #ffffff;
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(0, 82, 217, 0.3);
    }

    .feature-icon-box {
      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;
      font-weight: bold;
      margin-bottom: 18px;
    }

    .feature-title {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .feature-desc {
      font-size: 0.92rem;
      color: var(--text-regular);
      line-height: 1.65;
    }

    /* 平台聚合模型标签云 */
    .model-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-regular);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    /* 对比评测高亮区 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #0052d9 0%, #003cab 100%);
      border-radius: var(--radius-lg);
      color: #ffffff;
      padding: 40px;
      margin-bottom: 40px;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

    .eval-highlight-info h3 {
      font-size: 1.7rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #ffffff;
    }

    .eval-highlight-info p {
      font-size: 1.05rem;
      opacity: 0.9;
      max-width: 620px;
    }

    .eval-score-badge {
      background: rgba(255, 255, 255, 0.15);
      border: 1px solid rgba(255, 255, 255, 0.3);
      padding: 20px 32px;
      border-radius: var(--radius-md);
      text-align: center;
      backdrop-filter: blur(8px);
    }

    .eval-score-num {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1;
      color: #ffd666;
    }

    .eval-stars {
      color: #ffd666;
      font-size: 1.2rem;
      margin: 6px 0;
    }

    .eval-score-total {
      font-size: 0.88rem;
      opacity: 0.85;
    }

    .compare-table-wrap {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 22px;
      border-bottom: 1px solid var(--border-light);
      font-size: 0.95rem;
    }

    .compare-table th {
      background-color: #f7f8fa;
      color: var(--text-main);
      font-weight: 600;
    }

    .compare-table tr:hover {
      background-color: #fcfdfe;
    }

    .col-highlight {
      background-color: #f2f7ff;
      color: var(--primary);
      font-weight: 600;
    }

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

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

    .step-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      opacity: 0.3;
      margin-bottom: 8px;
    }

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

    .step-desc {
      font-size: 0.88rem;
      color: var(--text-regular);
      line-height: 1.55;
    }

    /* 案例与素材图 */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .media-thumb-box {
      position: relative;
      background: #edf2f7;
      aspect-ratio: 16 / 9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .media-thumb-square {
      aspect-ratio: 1 / 1;
    }

    .media-thumb-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

    .media-card:hover .media-thumb-box img {
      transform: scale(1.03);
    }

    .media-info {
      padding: 20px;
    }

    .media-info h4 {
      font-size: 1.05rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .media-info p {
      font-size: 0.88rem;
      color: var(--text-regular);
      line-height: 1.5;
    }

    /* 客户评价卡片 */
    .comment-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .comment-quote {
      font-size: 0.95rem;
      color: var(--text-main);
      line-height: 1.65;
      margin-bottom: 18px;
      font-style: italic;
    }

    .comment-user-box {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-light);
      padding-top: 14px;
    }

    .comment-avatar-ph {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
    }

    .comment-name {
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .comment-role {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1.02rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      user-select: none;
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--text-muted);
      transition: var(--transition);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background-color: #fafbfc;
      border-top: 1px solid transparent;
    }

    .faq-item.active .faq-answer {
      max-height: 240px;
      border-top-color: var(--border-light);
    }

    .faq-answer-inner {
      padding: 16px 24px 20px;
      font-size: 0.92rem;
      color: var(--text-regular);
      line-height: 1.65;
    }

    /* 表单与需求匹配 */
    .form-wrap {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      padding: 40px;
      max-width: 860px;
      margin: 0 auto;
    }

    .form-group-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

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

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

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      font-size: 0.95rem;
      color: var(--text-main);
      background: #ffffff;
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0, 82, 217, 0.12);
    }

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

    /* 文章列表与外链 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      max-width: 860px;
      margin: 0 auto;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 18px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .article-title {
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .article-link-tag {
      font-size: 0.85rem;
      color: var(--primary);
      font-weight: 500;
      white-space: nowrap;
    }

    /* 友情链接与页脚 */
    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px;
      color: var(--text-regular);
      margin-top: auto;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }

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

    .footer-desc {
      font-size: 0.9rem;
      color: var(--text-regular);
      line-height: 1.6;
      margin-bottom: 16px;
      max-width: 340px;
    }

    .footer-contact-item {
      font-size: 0.88rem;
      color: var(--text-regular);
      margin-bottom: 6px;
    }

    .footer-col h5 {
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .footer-col-links {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-col-links a {
      font-size: 0.88rem;
      color: var(--text-regular);
    }

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

    .footer-qr-box {
      width: 108px;
      height: 108px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      margin-top: 10px;
    }

    .footer-friends-bar {
      border-top: 1px solid var(--border-light);
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friends-title {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .friends-links {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friends-links a {
      font-size: 0.85rem;
      color: var(--text-regular);
    }

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

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

    /* 浮动客服入口 */
    .float-service-card {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 99;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      padding: 12px;
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
      width: 120px;
    }

    .float-qr {
      width: 96px;
      height: 96px;
      border-radius: 4px;
      overflow: hidden;
    }

    .float-title {
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--text-main);
    }

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }

      .nav-links.show {
        display: flex;
      }

      .menu-toggle {
        display: block;
      }

      .hero-title {
        font-size: 2rem;
      }

      .hero-desc {
        font-size: 1rem;
      }

      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }

      .grid-4 {
        grid-template-columns: 1fr;
      }

      .steps-grid {
        grid-template-columns: 1fr;
      }

      .form-group-grid {
        grid-template-columns: 1fr;
      }

      .form-group.full {
        grid-column: span 1;
      }

      .footer-top {
        grid-template-columns: 1fr;
      }

      .float-service-card {
        display: none;
      }
    }