:root {
      --primary: #10b981;
      --primary-dark: #059669;
      --primary-light: #ecfdf5;
      --primary-tint: #d1fae5;
      --accent: #14b8a6;
      --text-main: #1f2937;
      --text-muted: #4b5563;
      --text-light: #6b7280;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f0fdf4;
      --border: #e2e8f0;
      --border-focus: #10b981;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
      --shadow-lg: 0 10px 15px -3px rgba(16, 185, 129, 0.1), 0 4px 6px -4px rgba(0,0,0,0.05);
      --radius: 12px;
      --max-width: 1200px;
      --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, sans-serif;
      color: var(--text-main);
      background-color: var(--bg-page);
      line-height: 1.6;
    }

    body {
      background: linear-gradient(180deg, #f0fdf4 0%, #f8fafc 400px, #f8fafc 100%);
      color: var(--text-main);
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

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

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

    /* 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(--border);
      box-shadow: var(--shadow-sm);
    }

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

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

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .brand-badge {
      font-size: 0.75rem;
      background: var(--primary-tint);
      color: var(--primary-dark);
      padding: 2px 8px;
      border-radius: 999px;
      font-weight: 600;
    }

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

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: 6px;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 20px;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background: var(--primary);
      color: #ffffff;
      box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
      transform: translateY(-1px);
    }

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

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

    .btn-sm {
      padding: 6px 14px;
      font-size: 0.875rem;
    }

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

    /* 区域通用样式 */
    .section-block {
      padding: 64px 0;
    }

    .section-alt {
      background: var(--bg-alt);
      border-top: 1px solid rgba(16, 185, 129, 0.1);
      border-bottom: 1px solid rgba(16, 185, 129, 0.1);
    }

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

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary-dark);
      background: var(--primary-tint);
      padding: 4px 14px;
      border-radius: 999px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 首屏 Hero (无图片) */
    .hero-section {
      padding: 80px 0 60px;
      text-align: center;
      background: radial-gradient(circle at 50% 30%, #ecfdf5 0%, rgba(248, 250, 252, 0) 70%);
    }

    .hero-h1 {
      font-size: 2.5rem;
      font-weight: 900;
      color: #064e3b;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 32px;
      line-height: 1.7;
    }

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

    .hero-btn-main {
      font-size: 1.1rem;
      padding: 14px 32px;
      border-radius: 10px;
    }

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

    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border);
      padding: 24px 16px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .metric-value {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-dark);
      line-height: 1;
      margin-bottom: 8px;
    }

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

    /* 平台介绍与模型矩阵 */
    .models-marquee-wrapper {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      margin-top: 32px;
    }

    .models-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
      text-align: center;
    }

    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .model-tag {
      background: var(--bg-page);
      border: 1px solid var(--border);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      transition: var(--transition);
    }

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

    /* 功能服务网格 */
    .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: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .service-icon-box {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .service-name {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .service-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

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

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

    .step-num {
      font-size: 1.5rem;
      font-weight: 900;
      color: var(--primary-tint);
      margin-bottom: 8px;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 对比评测模块 */
    .compare-wrapper {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      overflow-x: auto;
      padding: 24px;
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: var(--primary-light);
      border: 1px solid var(--primary-tint);
      padding: 16px 24px;
      border-radius: 8px;
      margin-bottom: 24px;
    }

    .rating-score {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary-dark);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

    .compare-table th, .compare-table td {
      padding: 14px 16px;
      border-bottom: 1px solid var(--border);
      font-size: 0.95rem;
    }

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

    .compare-table tr:hover {
      background: var(--bg-alt);
    }

    .highlight-col {
      color: var(--primary-dark);
      font-weight: 700;
      background: rgba(16, 185, 129, 0.04);
    }

    /* 素材与案例展示 */
    .media-showcase-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 24px;
    }

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

    .media-img-container {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .media-img-container.square {
      aspect-ratio: 1 / 1;
      max-height: 280px;
    }

    .media-img-container img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .media-content {
      padding: 16px;
    }

    .media-title {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .media-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

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

    .testimonial-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      font-style: italic;
    }

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

    .author-avatar {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }

    .author-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-role {
      font-size: 0.8rem;
      color: var(--text-light);
    }

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

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

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

    .faq-question {
      padding: 16px 20px;
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary-dark);
      transition: transform 0.25s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: var(--bg-page);
    }

    .faq-answer-inner {
      padding: 16px 20px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px solid var(--border);
    }

    /* 表单与需求匹配 */
    .form-wrapper {
      max-width: 700px;
      margin: 0 auto;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid var(--border);
      border-radius: 8px;
      background: #ffffff;
      color: var(--text-main);
      transition: var(--transition);
      outline: none;
    }

    .form-control:focus {
      border-color: var(--border-focus);
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
    }

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

    /* 文章与资讯 */
    .article-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border);
      padding: 16px 20px;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition);
    }

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

    .article-link {
      font-weight: 600;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    /* 联系我们与二维码 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: center;
    }

    .contact-info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-info-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    .contact-info-item strong {
      color: var(--text-main);
      min-width: 90px;
    }

    .qr-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
      max-width: 260px;
      margin: 0 auto;
      box-shadow: var(--shadow-sm);
    }

    .qr-card img {
      width: 180px;
      height: 180px;
      display: block;
      margin: 0 auto 12px;
      border-radius: 8px;
    }

    .qr-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border);
      padding: 48px 0 24px;
      margin-top: auto;
    }

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

    .footer-col-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

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

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

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

    .friendly-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding: 16px 0;
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
      margin-bottom: 24px;
      align-items: center;
    }

    .friendly-links span {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

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

    .footer-bottom {
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* 浮动组件 */
    .floating-bar {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-btn {
      width: 44px;
      height: 44px;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      color: var(--primary-dark);
      font-size: 1.1rem;
      font-weight: 700;
      transition: var(--transition);
    }

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

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

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .hero-h1 {
        font-size: 1.85rem;
      }
      .hero-metrics, .grid-3, .grid-4, .workflow-steps, .media-showcase-grid, .article-list, .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }