body {
  font-family: sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: #f0f0f0;
  color: #111;
  transition: background-color 0.3s, color 0.3s;
}

body.dark {
  background-color: #1a1a2e;
  color: #e0e0e0;
}

.container {
  text-align: center;
}

#generate-btn {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
  margin-bottom: 20px;
  border-radius: 8px;
  border: 1px solid #aaa;
  background-color: #fff;
  color: #111;
  transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

body.dark #generate-btn {
  background-color: #16213e;
  color: #e0e0e0;
  border-color: #555;
}

#numbers-container {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.number-circle {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: #fff;
  border: 1px solid #ccc;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 20px;
  font-weight: bold;
  transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

body.dark .number-circle {
  background-color: #0f3460;
  border-color: #444;
  color: #e0e0e0;
}

#theme-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  padding: 8px 16px;
  font-size: 14px;
  cursor: pointer;
  border-radius: 20px;
  border: 1px solid #aaa;
  background-color: #fff;
  color: #111;
  transition: background-color 0.3s, color 0.3s, border-color 0.3s;
  z-index: 1000;
}

body.dark #theme-toggle {
  background-color: #16213e;
  color: #e0e0e0;
  border-color: #555;
}