* { box-sizing: border-box; }
body {
  font-family: 'Microsoft YaHei', sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
  color: #333;
}
header {
  text-align: center;
  padding: 2rem 1rem;
  background: #2c5f2d;
  color: white;
}
header h1 { margin: 0.5rem 0; }
main { max-width: 900px; margin: 2rem auto; padding: 0 1rem; }
section, article { margin-bottom: 2rem; }
.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background: #e74c3c;
  color: white;
  text-decoration: none;
  border-radius: 5px;
  margin: 0.5rem;
}
.btn-outline {
  border: 2px solid #e74c3c;
  color: #e74c3c;
  padding: 0.8rem 1.5rem;
  text-decoration: none;
  border-radius: 5px;
  margin: 0.5rem;
}
.product {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  background: white;
  padding: 1.5rem;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
@media (max-width: 600px) {
  .product { flex-direction: column; }
}
details { margin: 1rem 0; }
footer {
  text-align: center;
  padding: 2rem;
  background: #eee;
  font-size: 0.9em;
}