:root {
  --bg-color: #f0f0f0;
  --text-color: #333;
  --container-bg: #fff;
  --btn-bg: #4CAF50;
  --btn-text: #fff;
}

body.dark-mode {
  --bg-color: #1a1a1a;
  --text-color: #f0f0f0;
  --container-bg: #2d2d2d;
  --btn-bg: #45a049;
  --btn-text: #fff;
}

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

.container {
  text-align: center;
  background-color: var(--container-bg);
  padding: 2rem;
  border-radius: 15px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: background-color 0.3s;
}

.theme-toggle {
  text-align: right;
  margin-bottom: 1rem;
}

#theme-btn {
  background: none;
  border: 1px solid var(--text-color);
  color: var(--text-color);
  padding: 5px 10px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 0.8rem;
}

#generate-btn {
  background-color: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  padding: 10px 20px;
  font-size: 1rem;
  border-radius: 5px;
  cursor: pointer;
  transition: transform 0.1s;
}

#generate-btn:active {
  transform: scale(0.98);
}

.lotto-numbers {
  display: flex;
  justify-content: center;
  margin-top: 20px;
  gap: 10px;
}

.lotto-number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--btn-bg);
  color: var(--btn-text);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.2rem;
  font-weight: bold;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}