/* 基础重置与春绿薄荷清新风主题变量 */
    :root {
      --primary: #10b981;
      --primary-hover: #059669;
      --primary-light: #e6f7f0;
      --primary-dark: #047857;
      --bg-page: #f4fbf7;
      --bg-card: #ffffff;
      --text-main: #1f2937;
      --text-muted: #4b5563;
      --text-light: #6b7280;
      --border-color: #d1fae5;
      --shadow-sm: 0 2px 8px rgba(16, 185, 129, 0.06);
      --shadow-md: 0 4px 16px rgba(16, 185, 129, 0.1);
      --shadow-lg: 0 10px 25px rgba(16, 185, 129, 0.12);
      --radius: 12px;
      --max-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, sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

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

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

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      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-logo {
      display: flex;
      align-items: center;
      gap: 10px;
    }

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

    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-dark);
    }

    /* 强制要求: .nav-links 的 gap 属性设置为 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: 6px;
    }

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

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

    .btn-nav {
      background: var(--primary);
      color: #fff !important;
      padding: 8px 18px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 3px 10px rgba(16, 185, 129, 0.25);
    }

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

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

    /* 规范 Banner 图片区 */
    .banner-img-group {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 16px;
      margin: 20px 0;
    }

    .ai-page-image {
      width: 100%;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      object-fit: cover;
    }

    /* 首屏 HERO 区域 - 严格遵守不包含图片 */
    .hero-section {
      padding: 80px 0 60px;
      background: linear-gradient(135deg, #e6f7f0 0%, #f4fbf7 60%, #ffffff 100%);
      border-bottom: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      padding: 6px 16px;
      border-radius: 30px;
      border: 1px solid var(--border-color);
      font-size: 0.88rem;
      color: var(--primary-dark);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      color: #064e3b;
      margin-bottom: 16px;
      line-height: 1.25;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 32px;
    }

    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .btn-primary {
      background: linear-gradient(135deg, #10b981 0%, #059669 100%);
      color: #ffffff !important;
      padding: 14px 36px;
      border-radius: 30px;
      font-size: 1.05rem;
      font-weight: 700;
      box-shadow: 0 4px 15px rgba(16, 185, 129, 0.35);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(16, 185, 129, 0.45);
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--primary-dark) !important;
      border: 2px solid var(--primary);
      padding: 12px 32px;
      border-radius: 30px;
      font-size: 1.05rem;
      font-weight: 700;
      cursor: pointer;
    }

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

    /* 首屏数据指标卡片 */
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .stat-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .stat-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary-dark);
      line-height: 1.1;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-top: 6px;
    }

    /* 通用 Section 构造 */
    section {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }

    section:nth-child(even) {
      background-color: #ffffff;
    }

    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary);
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: #064e3b;
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* 网格与卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 20px;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

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

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 18px;
      font-weight: bold;
    }

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

    .card-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      flex-grow: 1;
    }

    .card-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 16px;
    }

    .tag {
      background: var(--primary-light);
      color: var(--primary-dark);
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 12px;
      font-weight: 600;
    }

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

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

    .step-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      opacity: 0.4;
      margin-bottom: 8px;
    }

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

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

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

    .comp-table th {
      background-color: var(--primary-light);
      color: var(--primary-dark);
      font-weight: 700;
    }

    .comp-table tr:hover {
      background-color: #f9fdfb;
    }

    .highlight-cell {
      background-color: rgba(16, 185, 129, 0.08);
      font-weight: 700;
      color: var(--primary-dark);
    }

    /* 评测卡片亮点 */
    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      background: #ecfdf5;
      border: 2px solid var(--primary);
      padding: 16px 28px;
      border-radius: 50px;
      margin-bottom: 24px;
    }

    .score-star {
      color: #f59e0b;
      font-size: 1.4rem;
    }

    .score-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-dark);
    }

    /* 帮助中心与FAQ */
    .faq-container {
      max-width: 850px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
    }

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

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

    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-muted);
      font-size: 0.95rem;
      display: none;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
    }

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

    .faq-toggle {
      font-size: 1.2rem;
      transition: transform 0.2s;
    }

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

    /* 用户评论 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
    }

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

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    .avatar-placeholder {
      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;
    }

    .user-info .name {
      font-weight: 700;
      font-size: 0.95rem;
    }

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

    /* 模型与API支持列表 */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 20px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
    }

    /* 联系我们与表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .contact-info {
      background: var(--primary-light);
      padding: 36px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
    }

    .contact-item {
      margin-bottom: 20px;
    }

    .contact-item strong {
      display: block;
      color: var(--primary-dark);
      font-size: 0.9rem;
      margin-bottom: 4px;
    }

    .qr-box {
      margin-top: 20px;
      display: inline-block;
      padding: 10px;
      background: #fff;
      border-radius: 10px;
      border: 1px solid var(--border-color);
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      display: block;
    }

    .contact-form {
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .form-group label {
      display: block;
      font-weight: 600;
      margin-bottom: 6px;
      font-size: 0.9rem;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      font-size: 0.95rem;
      outline: none;
      transition: border 0.2s;
    }

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

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

    /* 底部Footer与友情链接 */
    footer {
      background-color: #064e3b;
      color: #ecfdf5;
      padding: 60px 0 30px;
      margin-top: auto;
    }

    .footer-content {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 32px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-size: 1.1rem;
      margin-bottom: 16px;
      color: #ffffff;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 8px;
    }

    .footer-links a {
      color: #a7f3d0;
      font-size: 0.9rem;
    }

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

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding-top: 20px;
      border-top: 1px solid rgba(255, 255, 255, 0.15);
    }

    .friend-links a {
      color: #a7f3d0;
      font-size: 0.88rem;
    }

    .copyright-bar {
      text-align: center;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      font-size: 0.85rem;
      color: #6ee7b7;
    }

    /* 浮动客服入口 */
    .float-kefu {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      background: var(--primary);
      color: #ffffff;
      width: 56px;
      height: 56px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
      cursor: pointer;
      font-weight: bold;
      font-size: 0.9rem;
      text-align: center;
    }

    .float-kefu:hover {
      background: var(--primary-hover);
      transform: scale(1.05);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 1.9rem;
      }
    }