body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  transition: background 0.3s, color 0.3s;
}
body.dark {
  background-color: #121212;
  color: #f1f1f1;
}
body.light {
  background-color: #f9f9f9;
  color: #222;
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1em;
  background: linear-gradient(to right, #333, #444);
}
.logo {
  font-size: 1.5em;
}
.search {
  padding: 0.5em;
  flex: 1;
  margin: 0 1em;
  border-radius: 5px;
  border: none;
}
#theme-toggle {
  padding: 0.5em 1em;
  border: none;
  background: #00bcd4;
  color: white;
  border-radius: 5px;
  cursor: pointer;
}
.hero {
  background: url('https://via.placeholder.com/1000x300') center/cover no-repeat;
  padding: 4em 2em;
  text-align: center;
  animation: fadeIn 2s ease-in;
}
@keyframes fadeIn {
  from {opacity: 0;}
  to {opacity: 1;}
}
.category {
  padding: 2em;
}
.products {
  display: flex;
  flex-wrap: wrap;
  gap: 1em;
}
.card {
  background: #1e1e1e;
  padding: 1em;
  border-radius: 10px;
  box-shadow: 0 0 10px #000;
  width: 200px;
  transition: transform 0.3s;
}
.card:hover {
  transform: scale(1.05);
}
.card img {
  width: 100%;
  border-radius: 8px;
}
.buy-btn {
  display: inline-block;
  margin-top: 0.5em;
  padding: 0.5em 1em;
  background: #00bcd4;
  color: white;
  text-decoration: none;
  border-radius: 4px;
}
body.light .card {
  background: #ffffff;
  color: #000;
  box-shadow: 0 0 10px #ccc;
}
footer {
  text-align: center;
  padding: 1em;
  font-size: 0.9em;
}