body {
  font-family: 'Segoe UI', sans-serif;
  background: #f1f5f9;
  margin: 0;
  padding: 20px;
  font-size: 1.15rem;
}
.container {
  max-width: 700px;
  margin: auto;
  background: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}
h1, h2 {
  text-align: center;
  color: #1e293b;
}
.question, .result, .hint {
  margin-bottom: 24px;
  padding: 16px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  background: #f9fafb;
  border-left: 4px solid #3b82f6;
}
.question p {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: #111827;
}
.correct {
  color: #16a34a;
  font-weight: bold;
}
.incorrect {
  color: #dc2626;
  font-weight: bold;
}
.explanation {
  font-size: 1.1rem;
  color: #374151;
  margin-top: 8px;
  background: #eef2ff;
  padding: 10px;
  border-radius: 5px;
}
.hint {
  background: #fff7ed;
  border-left: 4px solid #fb923c;
}
button {
  background: #2563eb;
  color: white;
  padding: 12px 20px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  margin-top: 20px;
  font-size: 1.1rem;
  width: 100%;
}
button:hover {
  background: #1d4ed8;
}
select {
  padding: 10px;
  font-size: 1.1rem;
  margin-top: 10px;
  margin-bottom: 20px;
  width: 100%;
  border-radius: 6px;
  border: 1px solid #cbd5e1;
}
label {
  display: block;
  margin-top: 10px;
  font-weight: 600;
  background: #e0f2fe;
  padding: 12px;
  border-radius: 6px;
  border: 1px solid #bae6fd;
  text-align: center;
  font-size: 1.2rem;
}
input[type="radio"] {
  margin-right: 10px;
  width: 18px;
  height: 18px;
  accent-color: #2563eb;
}
a {
  display: block;
  margin-top: 24px;
  text-align: center;
  color: #2563eb;
  text-decoration: none;
  font-weight: bold;
  font-size: 1.1rem;
}
a:hover {
  text-decoration: underline;
}
@media screen and (max-width: 600px) {
  body {
    font-size: 1.2rem;
  }
  .container {
    padding: 15px;
  }
  button, select {
    font-size: 1.2rem;
  }
}