:root {
  --bg-color: #f0f0f0;
  --text-color: #333;
  --primary-color: #007bff;
  --primary-hover: #0056b3;
  --btn-text-color: #fff;
  --number-bg: #fff;
  --number-text: #333;
  --shadow-color: rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --primary-color: #1e88e5;
  --primary-hover: #1565c0;
  --btn-text-color: #fff;
  --number-bg: #333;
  --number-text: #e0e0e0;
  --shadow-color: rgba(0, 0, 0, 0.5);
}

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);
  margin: 0;
  transition: background-color 0.3s, color 0.3s;
}

.container {
  text-align: center;
  padding: 2rem;
  border-radius: 1rem;
}

#theme-toggle {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  font-size: 2rem;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  transition: transform 0.2s;
}

#theme-toggle:hover {
  transform: scale(1.1);
}

#generate-btn {
  padding: 12px 24px;
  font-size: 1.2rem;
  cursor: pointer;
  background-color: var(--primary-color);
  color: var(--btn-text-color);
  border: none;
  border-radius: 8px;
  transition: background-color 0.2s, transform 0.1s;
}

#generate-btn:hover {
  background-color: var(--primary-hover);
}

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

.lotto-numbers {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.lotto-number {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: var(--number-bg);
  font-size: 1.5em;
  font-weight: bold;
  color: var(--number-text);
  box-shadow: 0 4px 6px var(--shadow-color);
  transition: background-color 0.3s, color 0.3s, transform 0.2s;
}

.lotto-number:hover {
  transform: translateY(-5px);
}

@media (max-width: 600px) {
  .container {
    padding: 1rem;
    width: 90%;
  }

  h1 {
    font-size: 1.5rem;
  }

  #generate-btn {
    padding: 10px 20px;
    font-size: 1rem;
    width: 100%;
  }

  .lotto-number {
    width: 45px;
    height: 45px;
    font-size: 1.2rem;
  }
  
  #theme-toggle {
    top: 10px;
    right: 10px;
    font-size: 1.5rem;
  }
}