:root {
  --bg-color: #f4f7f6;
  --text-color: #333;
  --heading-color: #2c3e50;
  --number-bg: #3498db;
  --number-hover: #2980b9;
  --button-bg: #e74c3c;
  --button-hover: #c0392b;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --button-shadow: rgba(0, 0, 0, 0.2);
}

body.dark-mode {
  --bg-color: #1a1a1a;
  --text-color: #f4f7f6;
  --heading-color: #ecf0f1;
  --number-bg: #2980b9;
  --number-hover: #3498db;
  --shadow-color: rgba(255, 255, 255, 0.1);
}

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

h1 {
  color: var(--heading-color);
  margin-bottom: 30px;
}

#lottery-numbers {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 30px;
  min-height: 50px; /* To prevent layout shift */
}

.number {
  background-color: var(--number-bg);
  color: white;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2em;
  margin: 10px;
  box-shadow: 0 4px 8px var(--shadow-color);
  transition: transform 0.3s ease, background-color 0.3s ease;
}

.number:hover {
  transform: scale(1.1);
  background-color: var(--number-hover);
}

#draw-button {
  padding: 15px 30px;
  font-size: 1.1em;
  color: white;
  background-color: var(--button-bg);
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.3s ease;
  box-shadow: 0 4px 8px var(--button-shadow);
}

#draw-button:hover {
  background-color: var(--button-hover);
  transform: translateY(-2px);
}

#draw-button:active {
  transform: translateY(1px);
}

#theme-toggle {
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 10px 15px;
  cursor: pointer;
  border: none;
  border-radius: 5px;
  background-color: var(--text-color);
  color: var(--bg-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}