* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background: #f5f5f5;
  font-family: "Microsoft YaHei", sans-serif;
}
.title-bg {
  width: 100%;
  height: 180px;
  background-image: url("images/title-bg.jpg");
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 30px;
}
.title-bg h1 {
  color: white;
  font-size: 32px;
  text-shadow: 0 0 8px rgba(0,0,0,0.7);
}
.nav {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 40px;
}
.nav a {
  padding: 10px 22px;
  background: #3d7fff;
  color: #fff;
  border-radius: 8px;
  font-size: 15px;
  text-decoration: none;
  cursor: pointer;
}
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
}
.card-box {
  display: grid;
  grid-template-columns: repeat(4,1fr);
  gap: 20px;
}
.card {
  background: white;
  border-radius: 12px;
  overflow: hidden;
  text-align: center;
  padding-bottom: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}
.card p {
  margin-top: 10px;
  font-size: 15px;
}
.section-title {
  text-align: center;
  font-size: 24px;
  margin-bottom: 30px;
  color: #333;
}
.card h3 {
  font-size: 16px;
  margin-top: 10px;
}
.price {
  color: #e63946;
  font-weight: bold;
  margin-top: 6px;
  font-size: 15px;
}