:root {
  --background-color: #f0f0f0;
  --container-background-color: white;
  --text-color: #333;
  --button-background-color: #5cb85c;
  --button-hover-background-color: #4cae4c;
  --plus-sign-color: #555;
  --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.dark-mode {
  --background-color: #2c2c2c;
  --container-background-color: #3a3a3a;
  --text-color: #f0f0f0;
  --button-background-color: #4CAF50;
  --button-hover-background-color: #45a049;
  --plus-sign-color: #f0f0f0;
  --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

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

.lotto-container {
  background-color: var(--container-background-color);
  padding: 40px;
  border-radius: 20px;
  box-shadow: var(--box-shadow);
  text-align: center;
  transition: background-color 0.3s, box-shadow 0.3s;
}

h1 {
  margin-top: 0;
  color: var(--text-color);
  font-weight: 300;
  font-size: 2.5em;
  transition: color 0.3s;
}

button {
  background-color: var(--button-background-color);
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 1.2em;
  margin: 30px 0;
  cursor: pointer;
  border: none;
  border-radius: 10px;
  transition: background-color 0.3s, transform 0.2s;
}

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

#lotto-numbers {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 30px;
}

.lotto-ball {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  color: white;
  font-size: 1.8em;
  font-weight: bold;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2); /* Modified for cleaner look */
  text-shadow: 0px 0px 5px rgba(0,0,0,0.5);
  transition: background-color 0.3s;
}

.bonus-number {
  display: flex;
  align-items: center;
  margin-left: 15px;
}

.plus-sign {
  font-size: 2.5em;
  color: var(--plus-sign-color);
  margin-right: 15px;
  transition: color 0.3s;
}

/* Theme Switch Styles */
.theme-switch-wrapper {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  margin-bottom: 20px;
  padding-right: 10px;
}

.theme-switch {
  display: inline-block;
  height: 34px;
  position: relative;
  width: 60px;
}

.theme-switch input {
  display: none;
}

.slider {
  background-color: #ccc;
  bottom: 0;
  left: 0;
  right: 0;
  top: 0;
  cursor: pointer;
  position: absolute;
  transition: 0.4s;
}

.slider:before {
  background-color: #fff;
  bottom: 4px;
  content: "";
  height: 26px;
  left: 4px;
  position: absolute;
  transition: 0.4s;
  width: 26px;
}

input:checked + .slider {
  background-color: #2196f3;
}

input:checked + .slider:before {
  transform: translateX(26px);
}

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

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