:root {
      --primary: #10b981;
      --primary-dark: #059669;
      --primary-light: #ecfdf5;
      --mint-bg: #f2fbf7;
      --mint-border: #a7f3d0;
      --accent: #0d9488;
      --text-main: #1f2937;
      --text-muted: #4b5563;
      --text-light: #6b7280;
      --bg-white: #ffffff;
      --card-bg: #ffffff;
      --border-color: #e5e7eb;
      --shadow-sm: 0 1px 3px rgba(16, 185, 129, 0.08);
      --shadow-md: 0 4px 12px rgba(16, 185, 129, 0.1);
      --shadow-lg: 0 12px 30px rgba(16, 185, 129, 0.12);
      --radius: 12px;
      --max-width: 1200px;
    }

    * {
      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;
      color: var(--text-main);
      background-color: var(--mint-bg);
      line-height: 1.6;
      background-image: radial-gradient(circle at 10% 20%, rgba(16, 185, 129, 0.03) 0%, transparent 40%),
                        radial-gradient(circle at 90% 80%, rgba(13, 148, 136, 0.04) 0%, transparent 40%);
      background-attachment: fixed;
    }

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

    a {
      color: var(--primary-dark);
      text-decoration: none;
      transition: color 0.2s ease, background-color 0.2s ease;
    }

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

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

    /* 顶部导航 */
    .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(--mint-border);
      box-shadow: var(--shadow-sm);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      max-width: 180px;
    }

    .brand-logo .ai-page-logo {
      max-height: 40px;
      width: auto;
    }

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

    .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-main);
      padding: 8px 12px;
      border-radius: 6px;
      display: block;
    }

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

    .nav-action {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-left: 16px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff !important;
      box-shadow: 0 4px 10px rgba(16, 185, 129, 0.25);
    }

    .btn-primary:hover {
      background-color: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 14px rgba(16, 185, 129, 0.3);
    }

    .btn-outline {
      background-color: transparent;
      border-color: var(--primary);
      color: var(--primary-dark);
    }

    .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（无图片） */
    .hero-section {
      padding: 70px 0 60px;
      background: linear-gradient(180deg, rgba(236, 253, 245, 0.7) 0%, rgba(242, 251, 247, 0.4) 100%);
      border-bottom: 1px solid rgba(167, 243, 208, 0.4);
      position: relative;
    }

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

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background-color: var(--primary-light);
      color: var(--primary-dark);
      border: 1px solid var(--mint-border);
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .hero-title {
      font-size: 38px;
      line-height: 1.3;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 17px;
      line-height: 1.7;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .hero-actions .btn-lg {
      padding: 14px 34px;
      font-size: 16px;
    }

    .hero-features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
      margin-top: 20px;
      text-align: left;
    }

    .hero-stat-card {
      background: #ffffff;
      padding: 20px 24px;
      border-radius: var(--radius);
      border: 1px solid var(--mint-border);
      box-shadow: var(--shadow-sm);
    }

    .hero-stat-card strong {
      display: block;
      font-size: 22px;
      color: var(--primary-dark);
      margin-bottom: 4px;
    }

    .hero-stat-card span {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 公共区域标题 */
    .section-padding {
      padding: 70px 0;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 44px;
    }

    .section-subtitle {
      color: var(--primary-dark);
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 30px;
      color: var(--text-main);
      font-weight: 700;
      margin-bottom: 12px;
    }

    .section-intro {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 平台介绍 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: stretch;
    }

    .about-info-card {
      background: var(--bg-white);
      padding: 36px;
      border-radius: var(--radius);
      border: 1px solid var(--mint-border);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .about-highlights {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    .highlight-item {
      background: var(--primary-light);
      padding: 16px;
      border-radius: 8px;
      border: 1px solid var(--mint-border);
    }

    .highlight-item h4 {
      font-size: 15px;
      color: var(--primary-dark);
      margin-bottom: 6px;
    }

    .highlight-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    .model-tags-box {
      background: var(--bg-white);
      padding: 30px;
      border-radius: var(--radius);
      border: 1px solid var(--mint-border);
      box-shadow: var(--shadow-sm);
    }

    .model-tags-box h3 {
      font-size: 18px;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .model-tag {
      background: #f8fafc;
      border: 1px solid var(--border-color);
      padding: 6px 12px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 500;
      color: var(--text-main);
      transition: all 0.2s ease;
    }

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

    /* 服务能力卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 20px;
    }

    .service-card {
      background: var(--bg-white);
      border-radius: var(--radius);
      padding: 24px;
      border: 1px solid var(--border-color);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      border-color: var(--mint-border);
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .service-header {
      margin-bottom: 12px;
    }

    .service-badge {
      display: inline-block;
      font-size: 11px;
      font-weight: 600;
      padding: 3px 8px;
      border-radius: 4px;
      background: var(--primary-light);
      color: var(--primary-dark);
      margin-bottom: 10px;
    }

    .service-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .service-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 流程步骤 */
    .workflow-timeline {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: var(--bg-white);
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--mint-border);
      text-align: center;
      position: relative;
    }

    .step-number {
      width: 44px;
      height: 44px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      font-weight: 700;
      margin: 0 auto 16px;
      box-shadow: 0 4px 10px rgba(16, 185, 129, 0.25);
    }

    .step-card h3 {
      font-size: 16px;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 案例中心媒体卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .case-card {
      background: var(--bg-white);
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .case-media {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #e2e8f0;
    }

    .case-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-media img {
      transform: scale(1.04);
    }

    .case-info {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .case-info h3 {
      font-size: 16px;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .case-info p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测 */
    .compare-wrap {
      background: var(--bg-white);
      border-radius: var(--radius);
      padding: 32px;
      border: 1px solid var(--mint-border);
      box-shadow: var(--shadow-sm);
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: var(--primary-light);
      padding: 20px 24px;
      border-radius: 8px;
      margin-bottom: 24px;
      border: 1px solid var(--mint-border);
    }

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

    .score-num {
      font-size: 36px;
      font-weight: 800;
      color: var(--primary-dark);
    }

    .score-max {
      font-size: 16px;
      color: var(--text-muted);
    }

    .star-badge {
      font-size: 18px;
      color: #f59e0b;
      font-weight: 700;
    }

    .compare-table-responsive {
      overflow-x: auto;
      width: 100%;
    }

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

    .compare-table th, .compare-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
    }

    .compare-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 600;
    }

    .compare-table tr:hover td {
      background: rgba(236, 253, 245, 0.4);
    }

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

    /* 客户评价 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 20px;
    }

    .review-card {
      background: var(--bg-white);
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .review-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 14px;
    }

    .reviewer-meta strong {
      font-size: 15px;
      display: block;
      color: var(--text-main);
    }

    .reviewer-meta span {
      font-size: 12px;
      color: var(--text-light);
    }

    .review-text {
      font-size: 13.5px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-question {
      padding: 18px 24px;
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

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

    .faq-icon {
      font-size: 18px;
      color: var(--primary);
      transition: transform 0.2s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      background: #fafafa;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px 20px;
      border-top: 1px solid var(--border-color);
    }

    .faq-answer p {
      font-size: 13.5px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 表单与联系区域 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      background: var(--bg-white);
      border-radius: var(--radius);
      border: 1px solid var(--mint-border);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .contact-info-col {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-details-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin: 20px 0;
    }

    .contact-details-list li {
      font-size: 14px;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .contact-details-list li strong {
      color: var(--text-main);
      min-width: 80px;
    }

    .qr-wrap {
      max-width: 130px;
      padding: 8px;
      background: var(--primary-light);
      border: 1px solid var(--mint-border);
      border-radius: 8px;
      text-align: center;
    }

    .qr-wrap span {
      display: block;
      font-size: 12px;
      color: var(--primary-dark);
      margin-top: 4px;
      font-weight: 500;
    }

    .form-box {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .form-group label {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 14px;
      outline: none;
      background: #fdfdfd;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
    }

    textarea.form-control {
      min-height: 90px;
      resize: vertical;
    }

    /* 文章与资讯列表 */
    .articles-container {
      background: var(--bg-white);
      border-radius: var(--radius);
      padding: 30px;
      border: 1px solid var(--mint-border);
    }

    .article-links-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 12px;
      list-style: none;
      margin-top: 16px;
    }

    .article-links-list li a {
      display: block;
      padding: 12px 16px;
      background: #f8fafc;
      border-radius: 6px;
      font-size: 13px;
      color: var(--text-muted);
      border: 1px solid var(--border-color);
      transition: all 0.2s ease;
    }

    .article-links-list li a:hover {
      background: var(--primary-light);
      border-color: var(--primary);
      color: var(--primary-dark);
    }

    /* 底部通用规范 */
    .site-footer {
      background: #111827;
      color: #9ca3af;
      padding: 50px 0 30px;
      border-top: 1px solid #1f2937;
      margin-top: 40px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 36px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 15px;
      margin-bottom: 16px;
      font-weight: 600;
    }

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

    .footer-links a {
      color: #9ca3af;
      font-size: 13px;
    }

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

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

    .friendly-links-wrap a {
      color: #9ca3af;
      font-size: 13px;
      padding: 4px 8px;
      background: rgba(255, 255, 255, 0.05);
      border-radius: 4px;
    }

    .friendly-links-wrap a:hover {
      color: var(--primary);
      background: rgba(255, 255, 255, 0.1);
    }

    .footer-bottom {
      padding-top: 24px;
      border-top: 1px solid #1f2937;
      text-align: center;
      font-size: 13px;
      color: #6b7280;
    }

    /* 悬浮客服与返回顶部 */
    .fixed-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .tool-btn {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--mint-border);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary-dark);
      font-weight: bold;
      font-size: 13px;
      transition: all 0.2s ease;
      text-decoration: none;
    }

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

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 30px;
      }
      .about-grid, .contact-wrapper, .footer-grid {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--mint-border);
        box-shadow: var(--shadow-md);
        gap: 8px;
      }
      .nav-links.active li {
        width: 100%;
      }
      .nav-links.active li a {
        padding: 10px 14px;
      }
    }

    @media (max-width: 600px) {
      .hero-title {
        font-size: 24px;
      }
      .hero-desc {
        font-size: 14.5px;
      }
      .section-title {
        font-size: 22px;
      }
      .about-highlights {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
      }
    }