.filters {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.filter-btn {
  padding: 10px 20px;
  border: 1px solid var(--accent);
  border-radius: 30px;
  background: none;
  color: var(--accent);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--accent);
  color: white;
}

.shop-tools {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin: 50px 0;
}

.calculator, .cart {
  background: white;
  padding: 30px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.tools-title {
  font-size: 1.3rem;
  margin-bottom: 15px;
}

.coefficient {
  color: var(--gray);
  font-size: 0.9rem;
  margin-bottom: 15px;
}

.cart__items, .calc__items {
  margin: 20px 0;
  max-height: 300px;
  overflow-y: auto;
}

.cart-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px;
  border-bottom: 1px solid #eee;
}

.cart-item button {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
}

.calc-item {
  padding: 10px;
  border-bottom: 1px solid #eee;
}

.cart__results, .calc__results {
  padding: 15px;
  border-radius: 8px;
  margin: 20px 0;
  font-weight: bold;
}

.empty-message {
  text-align: center;
  color: var(--gray);
  padding: 20px;
}

@media (max-width: 768px) {
  .shop-tools {
    grid-template-columns: 1fr;
  }
}