:root {
      --primary: #0284c7;
      --primary-dark: #0369a1;
      --primary-light: #e0f2fe;
      --accent: #f97316;
      --accent-hover: #ea580c;
      --text-main: #0f172a;
      --text-muted: #475569;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
      --radius: 12px;
      --transition: all 0.25s ease-in-out;
    }

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

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

    body {
      background-color: var(--bg-page);
      color: var(--text-main);
      min-width: 320px;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .brand-group {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .brand-logo-wrap {
      display: flex;
      align-items: center;
      max-height: 42px;
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
      object-fit: contain;
    }

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

    .nav-links li a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 14px;
      border-radius: 6px;
      transition: var(--transition);
      display: block;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      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;
      border-radius: 8px;
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
    }

    .btn-primary:hover {
      background-color: var(--primary-dark);
      transform: translateY(-1px);
    }

    .btn-accent {
      background-color: var(--accent);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(249, 115, 22, 0.25);
    }

    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-1px);
    }

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

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

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
      padding: 6px;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 70px 0 60px;
      background: radial-gradient(circle at 80% 20%, rgba(2, 132, 199, 0.12) 0%, rgba(248, 250, 252, 0) 50%),
                  radial-gradient(circle at 10% 90%, rgba(249, 115, 22, 0.08) 0%, rgba(248, 250, 252, 0) 50%),
                  #ffffff;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background-color: var(--primary-light);
      color: var(--primary-dark);
      border-radius: 9999px;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 20px;
      border: 1px solid rgba(2, 132, 199, 0.2);
    }

    .hero-title {
      font-size: 40px;
      line-height: 1.3;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
    }

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

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background-color: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }

    .stat-card {
      text-align: center;
      border-right: 1px solid var(--border-color);
    }

    .stat-card:last-child {
      border-right: none;
    }

    .stat-number {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 通用Section */
    .section-wrap {
      padding: 70px 0;
    }

    .section-bg-alt {
      background-color: #f1f5f9;
    }

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

    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary);
      background-color: var(--primary-light);
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 网格布局通用 */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

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

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

    /* 卡片风格 */
    .card {
      background-color: var(--bg-card);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 28px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-3px);
      border-color: #cbd5e1;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      background-color: var(--primary-light);
      color: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 20px;
      font-weight: bold;
    }

    .card-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: auto;
    }

    .card-tag {
      font-size: 12px;
      padding: 2px 8px;
      border-radius: 4px;
      background-color: #f1f5f9;
      color: var(--text-muted);
    }

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

    .model-pill {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .model-pill:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: scale(1.05);
    }

    /* 流程与图文 */
    .step-list {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      counter-reset: step-counter;
    }

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

    .step-num {
      width: 36px;
      height: 36px;
      background-color: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
      margin-bottom: 16px;
    }

    .step-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .step-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 对比评测表格 */
    .rating-banner {
      background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 32px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-info h3 {
      font-size: 26px;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .rating-info p {
      font-size: 15px;
      opacity: 0.9;
    }

    .score-badge {
      text-align: right;
      background: rgba(255, 255, 255, 0.15);
      padding: 16px 28px;
      border-radius: 12px;
      border: 1px solid rgba(255, 255, 255, 0.3);
    }

    .score-val {
      font-size: 38px;
      font-weight: 900;
      line-height: 1;
      color: #fef08a;
    }

    .score-stars {
      font-size: 16px;
      color: #fef08a;
      margin-top: 4px;
    }

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

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    .custom-table th,
    .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    .custom-table th {
      background-color: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    .custom-table tr:hover td {
      background-color: #f8fafc;
    }

    .highlight-col {
      background-color: rgba(2, 132, 199, 0.03);
      font-weight: 600;
      color: var(--primary-dark);
    }

    /* 媒体与案例 */
    .media-card {
      background-color: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .media-img-wrap {
      width: 100%;
      background-color: #e2e8f0;
      overflow: hidden;
    }

    .media-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
      object-fit: cover;
    }

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

    .media-content {
      padding: 20px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

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

    .faq-item {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
      transition: var(--transition);
    }

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

    .faq-question {
      padding: 18px 24px;
      cursor: pointer;
      font-size: 16px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 20px;
      color: var(--primary);
      transition: var(--transition);
    }

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

    .faq-answer {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
    }

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

    /* 用户评论 */
    .testimonial-card {
      background-color: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      height: 100%;
    }

    .testimonial-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background-color: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 16px;
    }

    .user-name {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 表单区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background-color: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
      padding: 40px;
    }

    .contact-info {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .contact-icon {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background-color: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      flex-shrink: 0;
    }

    .contact-label {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 2px;
    }

    .contact-val {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
    }

    .qr-box {
      margin-top: 10px;
      padding: 16px;
      background: #f8fafc;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      display: inline-block;
      max-width: 180px;
      text-align: center;
    }

    .qr-box img {
      max-width: 100%;
      height: auto;
      border-radius: 4px;
      display: block;
      margin-bottom: 8px;
    }

    .qr-caption {
      font-size: 12px;
      color: var(--text-muted);
    }

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

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 14px;
      background-color: #f8fafc;
      color: var(--text-main);
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
    }

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

    /* 资讯与友情链接 */
    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-link-item {
      background: #ffffff;
      padding: 10px 16px;
      border-radius: 6px;
      border: 1px solid var(--border-color);
      font-size: 14px;
      color: var(--text-muted);
      transition: var(--transition);
    }

    .article-link-item:hover {
      color: var(--primary);
      border-color: var(--primary);
    }

    /* 页脚 Footer */
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links li a {
      font-size: 14px;
      color: #94a3b8;
      transition: var(--transition);
    }

    .footer-links li a:hover {
      color: #ffffff;
    }

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .friend-links-wrap a {
      font-size: 13px;
      color: #94a3b8;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
      transition: var(--transition);
    }

    .friend-links-wrap a:hover {
      color: #ffffff;
      background: #334155;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      flex-wrap: wrap;
      gap: 16px;
    }

    /* 悬浮侧边栏 */
    .floating-sidebar {
      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-color: #ffffff;
      color: var(--text-main);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 18px;
      transition: var(--transition);
      position: relative;
    }

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

    .float-qr-pop {
      position: absolute;
      right: 56px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      width: 140px;
      display: none;
      text-align: center;
    }

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

    .float-qr-pop img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 4px;
    }

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

    @media (max-width: 768px) {
      .hero-title {
        font-size: 28px;
      }
      .section-title {
        font-size: 24px;
      }
      .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .step-list {
        grid-template-columns: 1fr;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .stat-card:nth-child(2) {
        border-right: none;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        padding: 12px;
      }
      .mobile-menu-btn {
        display: block;
      }
    }