body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #f4f7fa;
  color: #333;
}
.topbar {
  background: #005f73;
  color: #fff;
  padding: 20px;
  text-align: center;
}
.container {
  max-width: 1000px;
  margin: 30px auto;
  padding: 0 15px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(220px,1fr));
  gap: 20px;
}
.card {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 15px;
  cursor: pointer;
  transition: 0.3s ease;
}
.card:hover {
  background: #e0f2f1;
  transform: translateY(-3px);
}
.guide {
  background: #ffffff;
  border: 1px solid #ccc;
  border-radius: 8px;
  padding: 20px;
  margin: 30px 0;
}
.guide h2 { margin-top: 0; }
.hidden { display: none; }
select {
  padding: 10px;
  font-size: 1rem;
  margin-top: 10px;
}
footer {
  text-align: center;
  padding: 20px 0;
  font-size: 0.9rem;
  color: #666;
}
footer a { color: #005f73; text-decoration: none; }
footer hr { margin: 20px auto; width: 80%; border-color: #ccc; }