:root {
  --bg: #f5f7fa;
  --text: #333;
  --header-bg: #ffffff;
  --header-text: #333;
  --card-bg: #ffffff;
}
body.dark {
  --bg: #202124;
  --text: #e5e5e5;
  --header-bg: #2d2f31;
  --header-text: #e5e5e5;
  --card-bg: #2d2f31;
}
body {
  background: var(--bg);
  color: var(--text);
  margin: 0;
  transition: 0.2s ease;
}
#global-buttons {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.global-btn {
  width: 48px;
  height: 48px;
  background: var(--card-bg);
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  font-size: 22px;
  transition: 0.2s;
}
.global-btn:hover {
  transform: scale(1.1);
}