:root {
  --background-color: #1a1a1a;
  --text-color: #ffffff;
  --accent-color: #ff4081;
  --container-bg: #2c2c2c;
  --ball-text: #ffffff;
  --ball-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
  --button-glow: 0 0 15px rgba(255, 64, 129, 0.8);
  --toggle-bg: #444;
}

body.light-mode {
  --background-color: #f0f2f5;
  --text-color: #333333;
  --accent-color: #007bff;
  --container-bg: #ffffff;
  --ball-text: #ffffff;
  --ball-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  --button-glow: 0 0 10px rgba(0, 123, 255, 0.3);
  --toggle-bg: #ddd;
}

body {
  background-color: var(--background-color);
  color: var(--text-color);
  font-family: 'Helvetica Neue', sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  transition: background-color 0.3s ease, color 0.3s ease;
  background-image: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23888888' fill-opacity='0.05' fill-rule='evenodd'%3E%3Cpath d='M0 40L40 0H20L0 20M40 40V20L20 40'/%3E%3C/g%3E%3C/svg%3E");
}

.container {
  background-color: var(--container-bg);
  padding: 40px;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  width: 90%;
  max-width: 500px;
  transition: background-color 0.3s ease;
  position: relative;
}

.theme-toggle {
  position: absolute;
  top: 15px;
  right: 15px;
  background-color: var(--toggle-bg);
  border: none;
  padding: 8px 12px;
  border-radius: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.9rem;
  color: var(--text-color);
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  opacity: 0.8;
}

h1 {
  font-size: 2.5rem;
  margin-top: 10px;
  margin-bottom: 30px;
  color: var(--accent-color);
  text-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
  transition: color 0.3s ease;
}

.lotto-numbers {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

#generate-btn {
  background-color: var(--accent-color);
  color: #fff;
  border: none;
  padding: 15px 30px;
  font-size: 1.2rem;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--button-glow);
}

#generate-btn:hover {
  transform: translateY(-3px);
  filter: brightness(1.1);
}

@media (max-width: 600px) {
  .container {
    padding: 20px;
  }
  h1 {
    font-size: 2rem;
  }
  .lotto-numbers {
    gap: 10px;
  }
}