:root {
      --primary: #10b981;
      --primary-dark: #059669;
      --primary-light: #ecfdf5;
      --mint-accent: #34d399;
      --mint-glow: #a7f3d0;
      --text-main: #1f2937;
      --text-muted: #4b5563;
      --text-light: #6b7280;
      --bg-page: #f9fbf9;
      --bg-card: #ffffff;
      --border-color: #e5e7eb;
      --shadow-sm: 0 2px 8px rgba(16, 185, 129, 0.06);
      --shadow-md: 0 10px 25px -5px rgba(16, 185, 129, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 20px 30px -10px rgba(16, 185, 129, 0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

    * {
      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, sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(16, 185, 129, 0.15);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

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

    .brand-area .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .brand-name span {
      color: var(--primary);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
    }

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

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .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;
      margin-left: 16px;
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, #10b981 0%, #059669 100%);
      color: #ffffff !important;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 9999px;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      font-size: 0.95rem;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(16, 185, 129, 0.45);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: #ffffff;
      color: var(--primary-dark) !important;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: 9999px;
      border: 1.5px solid var(--primary);
      cursor: pointer;
      transition: all 0.2s ease;
      font-size: 0.95rem;
    }

    .btn-outline:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    /* 英雄首屏（无图片） */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(100% 80% at 50% 0%, #ecfdf5 0%, #f9fbf9 100%);
      position: relative;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid var(--mint-glow);
      border-radius: 9999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary-dark);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background-color: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 0 3px var(--mint-glow);
    }

    .hero-title {
      font-size: 2.85rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }

    .hero-title .highlight {
      color: var(--primary-dark);
      background: linear-gradient(180deg, transparent 70%, #d1fae5 70%);
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.8;
    }

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

    .btn-hero-main {
      padding: 14px 34px;
      font-size: 1.1rem;
    }

    .hero-highlights {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 20px;
    }

    .hero-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 24px 20px;
      box-shadow: var(--shadow-sm);
      text-align: left;
      transition: all 0.3s ease;
      position: relative;
      border-top: 3px solid var(--primary);
    }

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

    .hero-card h3 {
      font-size: 1.1rem;
      color: var(--text-main);
      margin-bottom: 8px;
      font-weight: 700;
    }

    .hero-card p {
      font-size: 0.88rem;
      color: var(--text-light);
      line-height: 1.6;
    }

    /* 通用Section */
    .section {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background-color: #f2f7f4;
    }

    .section-header {
      text-align: center;
      max-width: 750px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary-dark);
      text-transform: uppercase;
      letter-spacing: 1.2px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.35;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 平台介绍 */
    .platform-intro-box {
      background: #ffffff;
      border: 1px solid #d1fae5;
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      margin-bottom: 30px;
    }

    .platform-intro-box p {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.9;
      margin-bottom: 24px;
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .model-tag {
      background: var(--primary-light);
      color: var(--primary-dark);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 600;
      border: 1px solid #a7f3d0;
    }

    /* 场景卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    .service-card .icon-box {
      width: 48px;
      height: 48px;
      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: 18px;
      font-weight: bold;
    }

    .service-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .service-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 标准流程时间线 */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      border: 1px solid #e5e7eb;
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .step-num {
      width: 42px;
      height: 42px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.1rem;
      margin: 0 auto 16px;
      box-shadow: 0 4px 10px rgba(16, 185, 129, 0.3);
    }

    .step-card h4 {
      font-size: 1.1rem;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 案例中心图文 */
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 30px;
    }

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

    .media-card-img-wrapper {
      width: 100%;
      height: 240px;
      overflow: hidden;
      background-color: #f3f4f6;
    }

    .media-card-img-wrapper img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

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

    .media-card-content {
      padding: 20px;
    }

    .media-card-content h4 {
      font-size: 1.15rem;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .media-card-content p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    .banner-gallery-item {
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #ffffff;
    }

    .banner-gallery-item img {
      width: 100%;
      height: 140px;
      object-fit: cover;
      display: block;
    }

    /* 对比评测表格 */
    .compare-score-box {
      background: linear-gradient(135deg, #10b981 0%, #047857 100%);
      color: #ffffff;
      border-radius: var(--radius-md);
      padding: 24px 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 24px;
      box-shadow: var(--shadow-md);
    }

    .compare-score-title {
      font-size: 1.25rem;
      font-weight: 700;
    }

    .compare-score-val {
      font-size: 2rem;
      font-weight: 900;
      color: #fef08a;
    }

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

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

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      font-size: 0.95rem;
      border-bottom: 1px solid var(--border-color);
    }

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

    .compare-table tr:last-child td {
      border-bottom: none;
    }

    .compare-table td.highlight-col {
      background-color: var(--primary-light);
      font-weight: 600;
      color: var(--primary-dark);
    }

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

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 18px;
    }

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
    }

    .reviewer-avatar-placeholder {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #d1fae5;
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .reviewer-info h5 {
      font-size: 0.98rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .reviewer-info span {
      font-size: 0.82rem;
      color: var(--text-light);
    }

    /* 折叠FAQ */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      background-color: #ffffff;
      transition: background 0.2s ease;
    }

    .faq-question:hover {
      background-color: #f0fdf4;
    }

    .faq-toggle-icon {
      font-size: 1.25rem;
      color: var(--primary);
      transition: transform 0.3s ease;
      font-weight: bold;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      background-color: #fbfdfc;
    }

    .faq-answer-content {
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    .faq-item.active .faq-answer {
      max-height: 500px;
      transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
    }

    /* 需求匹配与联系表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      padding: 40px;
    }

    .contact-info-col h3 {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .contact-info-col p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .contact-list {
      list-style: none;
      margin-bottom: 24px;
    }

    .contact-list li {
      margin-bottom: 12px;
      font-size: 0.95rem;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .contact-list li strong {
      color: var(--primary-dark);
      min-width: 80px;
    }

    .qrcode-box {
      margin-top: 20px;
      padding: 16px;
      background: var(--primary-light);
      border-radius: var(--radius-md);
      display: inline-block;
      text-align: center;
      border: 1px solid #a7f3d0;
    }

    .qrcode-box img {
      width: 130px;
      height: 130px;
      display: block;
      margin: 0 auto 8px;
      border-radius: var(--radius-sm);
    }

    .qrcode-box span {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary-dark);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1.5px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease;
      background: #ffffff;
    }

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

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

    /* 最新文章 */
    .article-links-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .article-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      list-style: none;
    }

    .article-links-list li a {
      display: inline-block;
      padding: 8px 16px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      color: var(--text-muted);
    }

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

    /* 底部通用区域 */
    .site-footer {
      background-color: #111827;
      color: #9ca3af;
      padding: 60px 0 30px;
      font-size: 0.9rem;
      border-top: 4px solid var(--primary);
    }

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

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.3rem;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 16px;
      max-width: 320px;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col ul li {
      margin-bottom: 10px;
    }

    .footer-col ul li a {
      color: #9ca3af;
    }

    .footer-col ul li a:hover {
      color: #34d399;
    }

    .footer-friend-links {
      border-top: 1px solid #1f2937;
      padding: 24px 0;
      margin-bottom: 24px;
    }

    .footer-friend-links h5 {
      color: #e5e7eb;
      font-size: 0.95rem;
      margin-bottom: 12px;
    }

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

    .friend-links-wrap a {
      color: #9ca3af;
      font-size: 0.88rem;
    }

    .friend-links-wrap a:hover {
      color: #34d399;
    }

    .footer-bottom {
      border-top: 1px solid #1f2937;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #6b7280;
    }

    /* 浮动工具 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      background: #10b981;
      color: #ffffff;
      padding: 12px 18px;
      border-radius: 9999px;
      box-shadow: 0 8px 24px rgba(16, 185, 129, 0.4);
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 0.9rem;
      cursor: pointer;
      transition: transform 0.2s ease;
    }

    .floating-kefu:hover {
      transform: scale(1.05);
      background: #059669;
    }

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

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-wrapper {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-wrapper.active {
        display: flex;
      }
      .nav-links {
        flex-direction: column;
        width: 100%;
        align-items: flex-start;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 12px 0;
        border-bottom: 1px solid #f3f4f6;
      }
      .header-actions {
        margin: 16px 0 0;
        width: 100%;
        justify-content: flex-start;
      }
      .hero-title {
        font-size: 2.1rem;
      }
      .hero-highlights, .grid-3, .grid-4, .reviews-grid, .process-steps, .media-card-grid {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }