/* common.css */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #ffffff;
  color: #333333;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: #f8f9fa;
  padding: 1rem;
  border-bottom: 1px solid #d1d5db;
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-link {
  color: #1e90ff;
  text-decoration: none;
  font-size: 1.2rem;
  padding: 0.5rem 1rem;
  transition: color 0.3s ease, background 0.3s ease;
}

.nav-link:hover {
  color: #1e40af;
  background: #e6f3ff;
  border-radius: 5px;
}

h1 {
  text-align: center;
  padding: 2rem;
  font-size: 2.5rem;
  color: #1e40af;
  margin: 0;
  border-bottom: 2px solid #1e90ff;
  background: #f8f9fa;
}

.passage {
  max-width: 700px;
  margin: 2rem auto;
  padding: 2rem;
  background: #f9fafb;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

.passage:hover {
  transform: translateY(-3px);
}

.passage p {
  cursor: pointer;
  padding: 1rem;
  border-left: 4px solid #1e90ff;
}

.passage p:hover {
  background: #e6f3ff;
}

.question, .point {
  max-width: 700px;
  margin: 1.5rem auto;
  padding: 1.5rem;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
}

.question h3 {
  color: #1e40af;
  margin-bottom: 1rem;
}

.options {
  margin-left: 1.5rem;
  cursor: pointer;
}

.options input[type="radio"] {
  accent-color: #1e90ff;
  margin-right: 10px;
}

.options label {
  font-size: 1.1rem;
  color: #374151;
}

.options label:hover {
  color: #1e90ff;
}

details {
  margin-top: 1rem;
  padding: 1rem;
  background: #f3f4f6;
  border-radius: 6px;
}

summary {
  cursor: pointer;
  font-weight: bold;
  color: #1e90ff;
}

summary:hover {
  color: #1e40af;
}

footer {
  margin-top: auto;
  background: #f8f9fa;
  padding: 1rem;
  text-align: center;
  border-top: 1px solid #d1d5db;
}

footer a {
  color: #1e90ff;
  text-decoration: none;
  margin: 0 1rem;
  font-size: 1.1rem;
  transition: color 0.3s ease;
}

footer a:hover {
  color: #1e40af;
}

footer p {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: #6b7280;
}
h2 {
  font-size: 1.8em;
  color: #2c3e50;
  font-weight: bold;
  margin-bottom: 1em;
  border-bottom: 2px solid #3498db;
  padding-bottom: 0.3em;
  font-family: 'Arial', sans-serif;
  text-align: center;
}