:root {
  --background-color: #f4f7f6;
  --text-color: #333;
  --primary-color: #007bff;
  --secondary-color: #6c757d;
  --accent-color: #28a745;
  --border-color: #dee2e6;
  --card-background: #ffffff;
  --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

body[data-theme="dark"] {
  --background-color: #2c3e50;
  --text-color: #ecf0f1;
  --primary-color: #3498db;
  --secondary-color: #95a5a6;
  --accent-color: #27ae60;
  --border-color: #34495e;
  --card-background: #34495e;
  --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 20px;
  background-color: var(--background-color);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
  box-sizing: border-box;
}

.container {
  background-color: var(--card-background);
  border-radius: 12px;
  padding: 30px;
  box-shadow: var(--box-shadow);
  text-align: center;
  max-width: 500px;
  width: 100%;
  margin-top: 50px;
}

h1 {
  color: var(--primary-color);
  margin-bottom: 30px;
  font-size: 2.2em;
  font-weight: 700;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

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

.number-ball {
  width: 60px;
  height: 60px;
  background-color: var(--secondary-color);
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  font-size: 1.8em;
  font-weight: bold;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  transition: background-color 0.3s ease, transform 0.2s ease;
  flex-shrink: 0; /* Prevent shrinking */
}

/* Color coding for lotto balls based on number range */
.number-ball.num-1-10 { background-color: #fbc400; } /* Yellow */
.number-ball.num-11-20 { background-color: #69c8f2; } /* Blue */
.number-ball.num-21-30 { background-color: #ff7272; } /* Red */
.number-ball.num-31-40 { background-color: #aaaaaa; } /* Gray */
.number-ball.num-41-45 { background-color: #b0d840; } /* Green */


#generate-button {
  background-color: var(--accent-color);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 15px 30px;
  font-size: 1.2em;
  cursor: pointer;
  outline: none;
  transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
  box-shadow: 0 5px 15px rgba(0, 123, 255, 0.3);
}

#generate-button:hover {
  background-color: #218838;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 123, 255, 0.4);
}

#generate-button:active {
  transform: translateY(0);
  box-shadow: 0 4px 10px rgba(0, 123, 255, 0.2);
}

/* Theme Switch Styles */
.theme-switch-wrapper {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  margin-bottom: 20px;
  gap: 10px;
  font-size: 0.9em;
}

.theme-switch {
  display: inline-block;
  height: 28px;
  position: relative;
  width: 50px;
}

.theme-switch input {
  display: none;
}

.slider {
  background-color: #ccc;
  bottom: 0;
  cursor: pointer;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  transition: .4s;
}

.slider:before {
  background-color: #fff;
  bottom: 4px;
  content: "";
  height: 20px;
  left: 4px;
  position: absolute;
  transition: .4s;
  width: 20px;
}

input:checked + .slider {
  background-color: var(--primary-color);
}

input:checked + .slider:before {
  transform: translateX(22px);
}

.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}

em {
  color: var(--text-color);
  font-style: normal;
}

@media (max-width: 600px) {
  .container {
    margin-top: 20px;
    padding: 20px;
  }

  h1 {
    font-size: 1.8em;
  }

  .number-ball {
    width: 50px;
    height: 50px;
    font-size: 1.5em;
  }

  #generate-button {
    padding: 12px 25px;
    font-size: 1em;
  }
}