:root {
  --background-color-light: #f0f0f0;
  --text-color-light: #333;
  --container-bg-light: #fff;
  --border-color-light: #ccc;
  --button-bg-light: #fff;
  --button-text-light: #333;

  --background-color-dark: #222;
  --text-color-dark: #fff;
  --container-bg-dark: #333;
  --border-color-dark: #555;
  --button-bg-dark: #555;
  --button-text-dark: #fff;
}

body {
  font-family: sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: var(--background-color-light);
  color: var(--text-color-light);
  transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
  --background-color-light: var(--background-color-dark);
  --text-color-light: var(--text-color-dark);
  --container-bg-light: var(--container-bg-dark);
  --border-color-light: var(--border-color-dark);
  --button-bg-light: var(--button-bg-dark);
  --button-text-light: var(--button-text-dark);
}

.container {
  text-align: center;
  background-color: var(--container-bg-light);
  padding: 20px;
  border-radius: 10px;
  transition: background-color 0.3s;
}

.lotto-numbers-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 20px;
}

.lotto-number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--button-bg-light);
  border: 2px solid var(--border-color-light);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 24px;
  margin: 5px;
  color: var(--text-color-light);
  transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

#generate-btn {
  padding: 10px 20px;
  font-size: 18px;
  cursor: pointer;
  background-color: var(--button-bg-light);
  color: var(--button-text-light);
  border: 1px solid var(--border-color-light);
  border-radius: 5px;
  transition: background-color 0.3s, color 0.3s;
}

.theme-switch-wrapper {
  position: absolute;
  top: 15px;
  right: 15px;
}

.theme-switch {
  display: inline-block;
  height: 34px;
  position: relative;
  width: 60px;
}

.theme-switch input {
  display:none;
}

.slider {
  background-color: #ccc;
  bottom: 0;
  cursor: pointer;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  transition: .4s;
}

.slider:before {
  background-color: #fff;
  bottom: 4px;
  content: "";
  height: 26px;
  left: 4px;
  position: absolute;
  transition: .4s;
  width: 26px;
}

input:checked + .slider {
  background-color: #2196F3;
}

input:checked + .slider:before {
  transform: translateX(26px);
}

.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}