:root {
  --bg-color: #f0f2f5;
  --container-bg: white;
  --text-color: #333;
  --h1-color: #1a73e8;
  --shadow: rgba(0, 0, 0, 0.1);
}

[data-theme='dark'] {
  --bg-color: #121212;
  --container-bg: #1e1e1e;
  --text-color: #e0e0e0;
  --h1-color: #8ab4f8;
  --shadow: rgba(0, 0, 0, 0.5);
}

body {
  font-family: sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 100vh;
  margin: 0;
  padding: 40px 20px;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}

.theme-controls {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  gap: 8px;
}

.theme-controls button {
  padding: 8px 12px;
  border: 1px solid #ccc;
  border-radius: 4px;
  background: var(--container-bg);
  color: var(--text-color);
  cursor: pointer;
  font-size: 0.9rem;
}

.theme-controls button.active {
  background-color: var(--h1-color);
  color: white;
  border-color: var(--h1-color);
}

h1 {
  color: var(--h1-color);
}

#lotto-container {
  background: var(--container-bg);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 6px var(--shadow);
  text-align: center;
  transition: background-color 0.3s, box-shadow 0.3s;
}

#lotto-numbers {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  min-height: 50px;
  justify-content: center;
}

.ball {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2rem;
  color: white;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

#generate-button {
  padding: 12px 24px;
  font-size: 1rem;
  background-color: #1a73e8;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.2s;
}

#generate-button:hover {
  background-color: #1557b0;
}