:root {
  --background-color: #ffffff;
  --text-color: #333333;
  --button-bg-color: #007bff;
  --button-text-color: #ffffff;
  --container-bg-color: #f0f0f0;
  --lotto-number-bg-color: #ffffff;
  --lotto-number-border-color: #dddddd;
}

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

body.dark-mode {
  --background-color: #1a1a1a;
  --text-color: #ffffff;
  --button-bg-color: #bb86fc;
  --button-text-color: #000000;
  --container-bg-color: #2c2c2c;
  --lotto-number-bg-color: #333333;
  --lotto-number-border-color: #555555;
}

.container {
  background-color: var(--container-bg-color);
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  text-align: center;
}

h1 {
  margin-bottom: 2rem;
}

.lotto-numbers-container {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.lotto-number {
  background-color: var(--lotto-number-bg-color);
  border: 1px solid var(--lotto-number-border-color);
  border-radius: 50%;
  width: 50px;
  height: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.5rem;
  font-weight: bold;
}

button {
  background-color: var(--button-bg-color);
  color: var(--button-text-color);
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.3s;
}

button:hover {
  opacity: 0.9;
}

#theme-toggle {
  position: absolute;
  top: 20px;
  right: 20px;
}