// 全局样式重置
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: #f5f5f5;
  color: #333;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.app-container {
  background-color: white;
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  max-width: 800px;
  width: 100%;
  animation: fadeIn 0.5s ease-in;
}

h1 {
  font-size: 2.5rem;
  color: #2c3e50;
  text-align: center;
  margin-bottom: 30px;
}

h2 {
  font-size: 1.8rem;
  color: #34495e;
  margin-bottom: 20px;
}

// 计数器部分样式
.counter-section {
  text-align: center;
  margin-bottom: 40px;
  padding: 20px;
  background-color: #ecf0f1;
  border-radius: 8px;
}

.counter-buttons {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 15px;
}

button {
  padding: 10px 20px;
  font-size: 1rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  background-color: #3498db;
  color: white;
  transition: background-color 0.3s ease;
  
  &:hover {
    background-color: #2980b9;
  }
  
  &:active {
    transform: translateY(1px);
  }
}

// Todo列表部分样式
.todos-section {
  
  & h2 {
    text-align: center;
  }
  
  & p {
    text-align: center;
    margin-bottom: 20px;
  }
}

.todo-list {
  list-style: none;
  padding: 0;
  
  & li {
    padding: 12px 16px;
    margin-bottom: 8px;
    background-color: #f8f9fa;
    border-radius: 6px;
    border-left: 4px solid #3498db;
    transition: all 0.2s ease;
    
    &:hover {
      background-color: #e9ecef;
      transform: translateX(4px);
    }
    
    &.completed {
      text-decoration: line-through;
      color: #6c757d;
      border-left-color: #28a745;
    }
  }
}

.error {
  color: #dc3545;
  font-weight: bold;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}