/* 公共样式 */
* {
  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;
  color: #333;
  background-color: #f5f5f5;
}

a {
  text-decoration: none;
  color: inherit;
}

button {
  border: none;
  outline: none;
  cursor: pointer;
  font-family: inherit;
}

input, textarea {
  border: none;
  outline: none;
  font-family: inherit;
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
}

.btn-primary {
  background-color: #1890ff;
  color: #fff;
}

.btn-primary:hover {
  background-color: #40a9ff;
}

.btn-secondary {
  background-color: #f0f0f0;
  color: #333;
}

.btn-secondary:hover {
  background-color: #e0e0e0;
}

.btn-disabled {
  background-color: #d9d9d9;
  color: #999;
  cursor: not-allowed;
}

/* 卡片样式 */
.card {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  margin-bottom: 16px;
}

/* 加载动画 */
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 40px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid #1890ff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: #999;
}

.empty-state-icon {
  font-size: 64px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state-text {
  font-size: 16px;
}

/* 响应式工具类 */
.hide-mobile {
  display: block;
}

.hide-desktop {
  display: none;
}

@media (max-width: 767px) {
  .hide-mobile {
    display: none;
  }
  
  .hide-desktop {
    display: block;
  }
}