:root {
  --primary-color: #1890ff;
  --background-color: #f5f5f5;
  --card-background: #ffffff;
  --text-color: #333333;
  --border-radius: 8px;
  --message-bg-self: #e3f2fd;
  --message-bg-other: #ffffff;
  --error-color: #ff4d4f;
  --success-color: #52c41a;
  --warning-color: #faad14;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  flex: 1;
  display: flex;
  gap: 20px;
}

@media (max-width: 768px) {
  .container {
    flex-direction: column;
    padding: 10px;
  }
}

/* 动画 */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 通用组件样式 */
.card {
  background: var(--card-background);
  border-radius: var(--border-radius);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  padding: 20px;
}

.button {
  padding: 8px 16px;
  border: none;
  border-radius: var(--border-radius);
  background: var(--primary-color);
  color: white;
  cursor: pointer;
  transition: background-color 0.3s;
}

.button:hover {
  background: #40a9ff;
}

.button.secondary {
  background: #f0f0f0;
  color: #666;
}

.button.secondary:hover {
  background: #e0e0e0;
}

/* 状态提示 */
.status-message {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 8px 16px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  z-index: 1000;
  transition: opacity 0.3s;
  animation: fadeIn 0.3s;
}

.status-message.error {
  background: var(--error-color);
}

.status-message.success {
  background: var(--success-color);
}

.status-message.warning {
  background: var(--warning-color);
}

.status-message.fade-out {
  opacity: 0;
}