body {
  background: #f4f4f4;
  color: #222;
  font-family: Arial, sans-serif;
  transition: background 0.3s, color 0.3s;
}
body.dark {
  background: #181a1b;
  color: #eee;
}
.container {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
  position: relative;
}
.top-right-controls {
  position: absolute;
  top: 10px;
  right: 10px;
}
.top-right-controls button {
  margin-left: 10px;
}
.content-wrapper {
  display: flex;
  justify-content: space-between;
  margin-top: 50px;
}
#quiz-content {
  flex: 2;
  padding-right: 20px;
}
#question {
  font-size: 1.25em;
  margin-bottom: 20px;
}
#sketch-holder {
  margin-left: 20px;
  width: 400px;
  height: 400px;
}
button {
  margin: 10px 5px;
  padding: 10px 24px;
  font-size: 1.1em;
  border: none;
  border-radius: 6px;
  background: #4caf50;
  color: #fff;
  cursor: pointer;
  transition: background 0.2s;
}
button:disabled {
  background: #888;
  cursor: not-allowed;
}
body.dark button {
  background: #333;
  color: #fff;
}
#choices button {
  background: #2196f3;
}
body.dark #choices button {
  background: #444;
}
#feedback {
  font-size: 1.2em;
  margin: 10px 0;
  min-height: 1.5em;
}

/* Responsive design for mobile */
@media (max-width: 768px) {
  .content-wrapper {
    flex-direction: column;
  }
  #sketch-holder {
    margin-left: 0;
    margin-top: 20px;
    width: 100%;
    height: auto;
  }
}