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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f8f9fa;
  color: #333;
  min-height: 100vh;
  transition: all 0.3s ease;
}

/* 暗色主题全局样式 */
body.dark-theme {
  background: #121212;
  color: #e0e0e0;
}

main {
  min-height: calc(100vh - 140px);
}