body {
  font-family: Arial, sans-serif;
  background: linear-gradient(to bottom, #f4f8fc, #eef3f8);
  margin: 0;
  padding: 40px;
  color: #222;
}

h1 {
  text-align: center;
  color: #0b1f5e;
  font-size: 52px;
  margin-bottom: 40px;
}

#quiz,
#explanation {
  background-color: #f8fbff;
  max-width: 1100px;
  margin: 0 auto 28px auto;
  padding: 34px;
  border-radius: 14px;
  border: 2px solid #6aa0ff;
  box-shadow: 0 4px 14px rgba(0,0,0,0.08);
  line-height: 1.7;
}

button {
  display: inline-block;
  margin: 10px 0 28px 50px;
  padding: 14px 26px;
  font-size: 22px;
  font-weight: bold;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: linear-gradient(to bottom, #2d7cff, #005be0);
  color: white;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

button:hover {
  background: linear-gradient(to bottom, #4d90ff, #0066ff);
}

label {
  display: block;
  margin-bottom: 24px;
  font-size: 18px;
  cursor: pointer;
}

#quiz p {
  font-size: 18px;
  line-height: 1.6;
}

input[type="radio"] {
  transform: scale(1.5);
  margin-right: 16px;
}

h2 {
  color: #10235c;
  margin-top: 0;
  font-size: 40px;
}

h3 {
  margin-top: 0;
  font-size: 34px;
}

.correct {
  background-color: #f3fbf3;
  border: 2px solid #56b356;
}

.correct h3 {
  color: #2f8f2f;
}

.notquite {
  background-color: #fffaf1;
  border: 2px solid #e2a93b;
}

.notquite h3 {
  color: #c47d00;
}

strong {
  color: #111;
}
#explanation.correct {
  background-color: #f3fbf3;
  border: 3px solid #56b356;
}

#explanation.correct h3 {
  color: #2f8f2f;
}

#explanation.notquite {
  background-color: #fff7e6;
  border: 3px solid #e2a93b;
}

#explanation.notquite h3 {
  color: #b36b00;
}

.return-button {

  display: inline-block;

  margin-top: 20px;

  padding: 14px 28px;

  background: #2f56c0;

  color: white;

  text-decoration: none;

  border-radius: 10px;

  font-size: 18px;

  font-weight: 600;

  transition: 0.2s;
}

.return-button:hover {

  background: #1f45a8;
}