:root {
  --background-color: #f4f4f4;
  --text-color: #333;
  --container-bg: #fff;
  --h1-color: #3f51b5;
  --display-border: #ccc;
  --button-bg: #4caf50;
  --button-hover-bg: #43a047;
  --lotto-number-bg: #e91e63;
}

body {
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  background-color: var(--background-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
  --background-color: #121212;
  --text-color: #e0e0e0;
  --container-bg: #1e1e1e;
  --h1-color: #7986cb;
  --display-border: #555;
  --button-bg: #66bb6a;
  --button-hover-bg: #5a9f5d;
  --lotto-number-bg: #f06292;
}

.container {
  position: relative;
  background-color: var(--container-bg);
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  text-align: center;
  transition: background-color 0.3s;
}

h1 {
  color: var(--h1-color);
  margin-bottom: 20px;
}

.numbers-display {
  margin-top: 20px;
  margin-bottom: 30px;
  border: 2px dashed var(--display-border);
  padding: 20px;
  min-height: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  transition: border-color 0.3s;
}

.lotto-number {
  display: inline-block;
  width: 40px;
  height: 40px;
  line-height: 40px;
  border-radius: 50%;
  background-color: var(--lotto-number-bg);
  color: white;
  font-size: 1.2em;
  font-weight: bold;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

button {
  background-color: var(--button-bg);
  color: white;
  padding: 12px 25px;
  border: none;
  border-radius: 5px;
  font-size: 1.1em;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: var(--button-hover-bg);
}

/* Theme Switch Styles */
.theme-switch {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  align-items: center;
  cursor: pointer;
}

.theme-switch .dark-text {
  display: none;
}
.theme-switch .light-text {
  display: block;
}

body.dark-mode .theme-switch .dark-text {
  display: block;
}
body.dark-mode .theme-switch .light-text {
  display: none;
}


.theme-switch span:not(.slider) {
  margin-right: 10px;
}

.theme-switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.slider {
  position: relative;
  width: 50px;
  height: 26px;
  background-color: #ccc;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
}

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

input:focus + .slider {
  box-shadow: 0 0 1px #2196F3;
}

input:checked + .slider:before {
  transform: translateX(24px);
}

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

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