* {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  background: linear-gradient(135deg, #f0f2f5, #dfe9f3);
}

/* HEADER */
header {
  background: linear-gradient(90deg, #000, #333);
  color: white;
  padding: 20px;
  text-align: center;
  font-size: 24px;
  letter-spacing: 1px;
}

/* FILTER */
.filters {
  padding: 15px;
  text-align: center;
}

.filters select {
  padding: 10px;
  border-radius: 8px;
  border: none;
  font-size: 16px;
}

/* CATALOG */
.catalog {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 25px;
  padding: 25px;
}

/* CARD */
.card {
  background: white;
  border-radius: 15px;
  padding: 15px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
  transition: transform 0.3s, box-shadow 0.3s;
  text-align: center;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.card img {
  width: 100%;
  height: 180px;
  object-fit: contain;
  margin-bottom: 10px;
}

/* TEXT */
.card h3 {
  margin: 10px 0;
}

.price {
  font-size: 20px;
  font-weight: bold;
  color: #2ecc71;
}

.stock {
  color: #666;
  font-size: 14px;
}

/* BUTTON */
button {
  margin-top: 12px;
  padding: 12px;
  width: 100%;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, #4facfe, #00f2fe);
  color: white;
  font-size: 16px;
  cursor: pointer;
  transition: opacity 0.3s, transform 0.2s;
}

button:hover {
  opacity: 0.9;
  transform: scale(1.03);
}

button:disabled {
  background: #aaa;
  cursor: not-allowed;
}

.cart {
  background: white;
  margin: 20px;
  padding: 20px;
  border-radius: 15px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.cart h2 {
  margin-top: 0;
}