* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans TC", sans-serif;
  background: #f5f7fa;
  color: #333;
  line-height: 1.6;
}
header {
  background: #1a5f7a;
  color: white;
  padding: 1rem;
  text-align: center;
}
header h1 { font-size: 1.25rem; margin-bottom: 0.6rem; }
nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}
nav a {
  color: white;
  text-decoration: none;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  background: rgba(255,255,255,0.15);
  font-size: 0.95rem;
}
nav a:hover { background: rgba(255,255,255,0.3); }
main {
  max-width: 720px;
  margin: 1.5rem auto;
  padding: 0 1rem;
}
.card {
  background: white;
  border-radius: 12px;
  padding: 1.4rem;
  margin-bottom: 1.2rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}
.card h2 {
  color: #1a5f7a;
  margin-bottom: 0.8rem;
  font-size: 1.2rem;
}
.content { white-space: pre-wrap; }
.btn {
  display: inline-block;
  background: #1a5f7a;
  color: white;
  padding: 0.65rem 1.2rem;
  border-radius: 8px;
  text-decoration: none;
  margin-top: 0.8rem;
}
.btn:hover { background: #144a5e; }
.item {
  padding: 0.8rem 0;
  border-bottom: 1px solid #eee;
}
.item:last-child { border-bottom: none; }
footer {
  text-align: center;
  padding: 1.5rem;
  color: #777;
  font-size: 0.85rem;
}