:root {
      --primary: #00c853;
      --primary-dark: #009624;
      --primary-light: #e8f5e9;
      --accent: #10b981;
      --accent-glow: rgba(0, 200, 83, 0.15);
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 10px 25px -5px rgba(0, 200, 83, 0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
      --shadow-lg: 0 20px 30px -10px rgba(0, 200, 83, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      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;
    }

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

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

    header.site-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-color);
      transition: all 0.3s ease;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: var(--text-main);
      font-weight: 700;
      font-size: 1.25rem;
    }

    .brand-logo-wrap .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      text-decoration: none;
      color: var(--text-muted);
      font-size: 0.95rem;
      font-weight: 500;
      transition: color 0.2s, background-color 0.2s;
      border-radius: var(--radius-sm);
    }

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

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn-nav-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      border-radius: 50px;
      text-decoration: none;
      box-shadow: 0 4px 12px rgba(0, 200, 83, 0.3);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .btn-nav-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(0, 200, 83, 0.4);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .mobile-menu-btn span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* Hero 首屏 - 严格无图，纯CSS与高质感几何营造 */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 10%, rgba(0, 200, 83, 0.08) 0%, rgba(248, 250, 252, 1) 70%);
      position: relative;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: var(--primary-light);
      color: var(--primary-dark);
      font-size: 0.88rem;
      font-weight: 600;
      border-radius: 30px;
      margin-bottom: 24px;
      border: 1px solid rgba(0, 200, 83, 0.2);
    }

    .hero-badge .dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary);
    }

    .hero-title {
      font-size: clamp(2rem, 4.5vw, 3.2rem);
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title .text-green {
      color: var(--primary-dark);
      background: linear-gradient(135deg, #00c853 0%, #007e22 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 800px;
      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;
    }

    .btn-hero-main {
      padding: 16px 36px;
      font-size: 1.1rem;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, #00e676 0%, #00a844 100%);
      border-radius: 50px;
      text-decoration: none;
      box-shadow: 0 8px 25px rgba(0, 200, 83, 0.4);
      transition: all 0.3s;
      border: 1px solid rgba(255, 255, 255, 0.4);
    }

    .btn-hero-main:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 12px 30px rgba(0, 200, 83, 0.5);
    }

    .btn-hero-secondary {
      padding: 16px 32px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 50px;
      text-decoration: none;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s;
    }

    .btn-hero-secondary:hover {
      background: var(--primary-light);
      border-color: var(--primary);
      color: var(--primary-dark);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      border: 1px solid rgba(0, 200, 83, 0.15);
      max-width: 1000px;
      margin: 0 auto;
    }

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

    .stat-item:not(:last-child)::after {
      content: "";
      position: absolute;
      right: 0;
      top: 15%;
      height: 70%;
      width: 1px;
      background-color: var(--border-color);
    }

    .stat-value {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 通用Section */
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }

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

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

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: var(--primary-light);
      color: var(--primary-dark);
      font-size: 0.85rem;
      font-weight: 700;
      border-radius: 20px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 14px;
    }

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

    /* 卡片网格 */
    .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: 30px;
    }

    /* 服务卡片 */
    .feature-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(0, 200, 83, 0.4);
    }

    .card-icon {
      width: 52px;
      height: 52px;
      background: var(--primary-light);
      color: var(--primary-dark);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 20px;
      font-weight: 700;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .card-tag {
      display: inline-block;
      align-self: flex-start;
      font-size: 0.78rem;
      padding: 3px 10px;
      border-radius: 4px;
      background: #f1f5f9;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 平台聚合标签云 */
    .models-cloud-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .cloud-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 20px;
    }

    .model-chip {
      background: var(--bg-page);
      border: 1px solid var(--border-color);
      padding: 8px 18px;
      border-radius: 50px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      transition: all 0.2s;
    }

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

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

    .step-card {
      background: #ffffff;
      padding: 30px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .step-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary);
      opacity: 0.8;
      margin-bottom: 12px;
      line-height: 1;
    }

    .step-card h4 {
      font-size: 1.15rem;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .step-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测表格与卡片 */
    .review-highlight {
      background: linear-gradient(135deg, #00c853 0%, #009624 100%);
      color: #ffffff;
      padding: 36px;
      border-radius: var(--radius-lg);
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
      margin-bottom: 30px;
      box-shadow: 0 10px 25px rgba(0, 200, 83, 0.3);
    }

    .review-score-box {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .score-num {
      font-size: 3.6rem;
      font-weight: 900;
      line-height: 1;
    }

    .score-max {
      font-size: 1.2rem;
      opacity: 0.9;
    }

    .stars {
      color: #ffd700;
      font-size: 1.5rem;
      letter-spacing: 2px;
    }

    .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: 650px;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }

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

    .compare-table tr:hover td {
      background: #fcfdfd;
    }

    .highlight-cell {
      background: rgba(0, 200, 83, 0.04);
      color: var(--primary-dark);
      font-weight: 700;
    }

    /* 案例展示区 */
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .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-card .img-box {
      position: relative;
      background: #f1f5f9;
      width: 100%;
      overflow: hidden;
    }

    .media-card .img-box img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s;
    }

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

    .media-body {
      padding: 20px;
    }

    .media-body h4 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }

    .media-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      padding: 26px;
      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;
    }

    .review-user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 20px;
      padding-top: 16px;
      border-top: 1px solid #f1f5f9;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .user-meta h5 {
      font-size: 0.95rem;
      font-weight: 700;
    }

    .user-meta span {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 900px;
      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;
      transition: all 0.2s;
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
      background: #ffffff;
    }

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fbfdfc;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

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

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px;
      border-top: 1px solid #f1f5f9;
    }

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

    .contact-form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }

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

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

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

    .form-control {
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #fafafa;
      transition: border-color 0.2s, box-shadow 0.2s;
      outline: none;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(0, 200, 83, 0.15);
    }

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

    .btn-submit {
      width: 100%;
      padding: 15px;
      font-size: 1.05rem;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      border: none;
      border-radius: 50px;
      cursor: pointer;
      box-shadow: 0 6px 20px rgba(0, 200, 83, 0.3);
      transition: all 0.2s;
    }

    .btn-submit:hover {
      opacity: 0.95;
      transform: translateY(-2px);
    }

    /* 文章列表 */
    .article-links-box {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      margin-top: 20px;
    }

    .article-links-box ul {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }

    .article-links-box li a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.92rem;
      transition: color 0.2s;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .article-links-box li a:hover {
      color: var(--primary-dark);
      text-decoration: underline;
    }

    /* 友情链接与Footer */
    .friend-links-wrap {
      padding: 30px 0;
      border-top: 1px solid var(--border-color);
      background: #ffffff;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      justify-content: center;
    }

    .friend-links-list a {
      color: var(--text-light);
      text-decoration: none;
      font-size: 0.88rem;
      transition: color 0.2s;
    }

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

    footer.site-footer {
      background: #111827;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1f2937;
    }

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

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.3rem;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 16px;
      color: #94a3b8;
    }

    .footer-links h5,
    .footer-contact h5 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 16px;
    }

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

    .footer-links ul li a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.88rem;
      transition: color 0.2s;
    }

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

    .footer-qrcode-box {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-qrcode-box img {
      width: 100px;
      height: 100px;
      background: #ffffff;
      padding: 4px;
      border-radius: var(--radius-sm);
    }

    .footer-bottom {
      border-top: 1px solid #1f2937;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 浮动客服 */
    .floating-kefu {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
    }

    .kefu-btn {
      width: 50px;
      height: 50px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 15px rgba(0, 200, 83, 0.4);
      cursor: pointer;
      transition: transform 0.2s;
      text-decoration: none;
      font-weight: 700;
      font-size: 0.85rem;
    }

    .kefu-btn:hover {
      transform: scale(1.1);
    }

    .back-top-btn {
      width: 42px;
      height: 42px;
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: var(--shadow-sm);
      opacity: 0;
      pointer-events: none;
      transition: all 0.3s;
      font-weight: bold;
    }

    .back-top-btn.show {
      opacity: 1;
      pointer-events: auto;
    }

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .grid-4, .steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .banner-gallery, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stat-item:nth-child(2)::after {
        display: none;
      }
      .grid-3, .grid-4, .grid-2, .steps-grid, .banner-gallery, .reviews-grid {
        grid-template-columns: 1fr;
      }
      .contact-form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .article-links-box ul {
        grid-template-columns: 1fr;
      }
    }