/* 微信风格基础样式 */
:root {
  --wechat-green: #07c160;
  --wechat-gray: #f0f0f0;
  --wechat-text: #333;
}

/* 容器样式 */
.wechat-container {
  max-width: 375px;
  margin: 0 auto;
  background: white;
  min-height: 100vh;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

/* 头部样式 */
.wechat-header {
  background: var(--wechat-green);
  color: white;
  padding: 15px;
  text-align: center;
}

.wechat-header h1 {
  margin: 0;
  font-size: 18px;
  font-weight: normal;
}

/* 主内容区域 */
.wechat-main {
  padding: 20px;
}

/* 按钮样式 */
.wechat-btn {
  display: block;
  width: 100%;
  padding: 12px;
  margin: 10px 0;
  border: none;
  border-radius: 5px;
  background: var(--wechat-green);
  color: white;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.3s;
}

.wechat-btn:hover {
  background: #06ad54;
}

/* 网格容器 */
.sudoku-grid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 2px;
  margin-bottom: 20px;
}