#root {
  max-width: 700px;
  margin: 0 auto;
  padding: 2rem;
}

.app {
  text-align: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 20px;
  padding: 3rem 2rem;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  min-height: 500px;
}

.app h1 {
  color: white;
  margin-bottom: 2.5rem;
  font-size: 2.5rem;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
  font-weight: 700;
}

.input-container {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
  background: white;
  padding: 0.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.todo-input {
  flex: 1;
  padding: 0.875rem 1.25rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  transition: all 0.3s;
  background: #f8f9fa;
}

.todo-input:focus {
  outline: none;
  background: white;
  box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.1);
}

.add-button {
  padding: 0.875rem 2rem;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.add-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.add-button:active {
  transform: translateY(0);
}

.todos-container {
  text-align: left;
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.empty-message {
  text-align: center;
  color: #999;
  font-style: italic;
  padding: 3rem;
  font-size: 1.1rem;
}

.todo-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.todo-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  border-radius: 12px;
  transition: all 0.3s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.todo-item:hover {
  transform: translateX(5px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

.todo-item.completed .todo-text {
  text-decoration: line-through;
  color: #999;
  opacity: 0.7;
}

.todo-checkbox {
  width: 24px;
  height: 24px;
  cursor: pointer;
  accent-color: #667eea;
  transform: scale(1.2);
}

.todo-text {
  flex: 1;
  font-size: 1.05rem;
  color: #333;
  font-weight: 500;
}

.delete-button {
  padding: 0.5rem 1.25rem;
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.3s;
  box-shadow: 0 2px 8px rgba(245, 87, 108, 0.3);
}

.delete-button:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(245, 87, 108, 0.5);
}

.delete-button:active {
  transform: scale(0.95);
}

.stats {
  display: flex;
  justify-content: space-around;
  margin-top: 2rem;
  padding: 1.25rem;
  background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  border-radius: 12px;
  font-size: 1rem;
  color: white;
  font-weight: 600;
  box-shadow: 0 4px 15px rgba(250, 112, 154, 0.3);
}

.stats span {
  font-weight: 600;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

/* 添加动画效果 */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.todo-item {
  animation: slideIn 0.3s ease-out;
}