   <!-- AI师辅导航栏style开始 -->
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Microsoft YaHei', sans-serif;
        }
        
        .navbar {
            background: white;
            color: black;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 10px 20px;
            position: relative;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        
        .nav-logo {
            display: flex;
            align-items: center;
            text-decoration: none;
            color: black;
        }
        
        .nav-logo img {
            height: 40px;
            margin-right: 10px;
        }
        
        .nav-logo h2 {
            font-size: 20px;
            font-weight: normal;
            margin: 0;
        }
        
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            margin-left: 20px;
        }
        
        .nav-links a {
            color: black;
            text-decoration: none;
            font-size: 16px;
            transition: all 0.3s;
            padding: 5px 10px;
            border-radius: 5px;
        }
        
        .nav-links a:hover {
            background-color: rgba(0, 0, 0, 0.1);
        }
        
        .menu-toggle {
            display: none;
            cursor: pointer;
            font-size: 24px;
            color: black;
        }
        
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: white;
                flex-direction: column;
                padding: 10px 0;
                z-index: 1000;
                box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            }
            
            .nav-links.active {
                display: flex;
            }
            
            .nav-links li {
                margin: 0;
                text-align: center;
                padding: 10px 0;
            }
            
            .menu-toggle {
                display: block;
            }
        }
    <!-- 导航栏style结束AI910.cn  -->

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
      background: #f5f5f5;
      padding: 20px;
      color: #333;
    }
    
    .container {
      max-width: 800px;
      margin: 0 auto;
      background: white;
      border-radius: 8px;
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
      overflow: hidden;
    }
    
    header {
      background: #dd2c00;
      color: white;
      padding: 20px;
      text-align: center;
    }
    
    h1 {
      font-size: 24px;
      margin-bottom: 10px;
    }
    
    .subtitle {
      opacity: 0.9;
    }
    
    .input-area {
      padding: 20px;
      background: #f9f9f9;
      border-bottom: 1px solid #eee;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    .input-group {
      flex: 1;
      max-width: 400px;
      display: flex;
      gap: 10px;
    }
    
    #character-input {
      flex: 1;
      padding: 12px 15px;
      border: 1px solid #ddd;
      border-radius: 4px;
      font-size: 16px;
      min-width: 60px;
    }
    
    .btn {
      padding: 12px 20px;
      border: none;
      border-radius: 4px;
      cursor: pointer;
      font-weight: bold;
      transition: all 0.2s;
    }
    
    .btn-primary {
      background: #dd2c00;
      color: white;
    }
    
    .btn-primary:hover {
      background: #c62400;
    }
    
    .btn-secondary {
      background: #f0f0f0;
      color: #666;
    }
    
    .btn-secondary:hover {
      background: #e0e0e0;
    }
    
    .btn-group {
      display: flex;
      gap: 10px;
    }
    
    .display-area {
      padding: 30px;
      position: relative;
      min-height: 400px;
    }
    
    #character-target {
      width: 275px;
      height: 275px;
      margin: 0 auto;
      position: relative;
      display: block;
    }
    
    .control-panel {
      background: #f9f9f9;
      padding: 20px;
      border-top: 1px solid #eee;
      display: flex;
      flex-wrap: wrap;
      gap: 25px;
      align-items: center;
      justify-content: center;
    }
    
    .control-group {
      min-width: 200px;
    }
    
    .control-group label {
      display: block;
      margin-bottom: 8px;
      font-weight: bold;
      color: #666;
    }
    
    input[type="range"] {
      width: 100%;
      height: 5px;
      border-radius: 5px;
      background: #e0e0e0;
      outline: none;
      transition: background 0.3s;
    }
    
    input[type="range"]::-webkit-slider-thumb {
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: #dd2c00;
      cursor: pointer;
    }
    
    footer {
      padding: 15px;
      text-align: center;
      color: #888;
      font-size: 13px;
      background: #f9f9f9;
      border-top: 1px solid #eee;
    }
    
    .status-bar {
      margin-top: 20px;
      text-align: center;
      font-size: 14px;
      color: #666;
      height: 20px;
    }
    
    .watermark {
      position: absolute;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      pointer-events: none;
      opacity: 0.1;
      font-size: 192px; /* 放大1.5倍 */
      z-index: -1;
      font-weight: bold;
    }
    
    /* 响应式调整 */
    @media (max-width: 600px) {
      .control-panel {
        flex-direction: column;
        gap: 15px;
      }
      
      .control-group {
        width: 100%;
      }
    }
    
    /* 田字格样式 */
    .tianzi-grid {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 280px;
      height: 280px;
      border: 2px solid #333;
      pointer-events: none;
      z-index: 1;
    }
    
    .tianzi-grid::before,
    .tianzi-grid::after {
      content: '';
      position: absolute;
      background-color: #333;
    }
    
    /* 水平中线 */
    .tianzi-grid::before {
      top: 50%;
      left: 0;
      right: 0;
      height: 1px;
      transform: translateY(-50%);
    }
    
    /* 垂直中线 */
    .tianzi-grid::after {
      left: 50%;
      top: 0;
      bottom: 0;
      width: 1px;
      transform: translateX(-50%);
    }
    
    /* 调整书写区域位置 */
    .hanzi-writer-target {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 280px !important;
      height: 280px !important;
    }