:root {
  --bg-color: #ffffff;
  --text-color: #2c3e50;
  --card-bg: #f8f9fa;
  --accent-color: #3498db;
  --cart-bg: #e3f2fd;
  --remove-bg: #e74c3c;
}

body.dark {
  --bg-color: #1e1e2f;
  --text-color: #f1f1f1;
  --card-bg: #2a2a40;
  --accent-color: #2980b9;
  --cart-bg: #3a3a50;
  --remove-bg: #c0392b;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  min-height: 100vh;
  padding: 20px;
  transition: background 0.3s, color 0.3s;
}

.container {
  max-width: 800px;
  margin: auto;
  background-color: var(--card-bg);
  padding: 30px 25px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

#toggle-theme {
  float: right;
  margin-bottom: 15px;
  background-color: var(--accent-color);
  color: white;
  padding: 6px 12px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

h1,
h2 {
  text-align: center;
  color: var(--text-color);
  margin-bottom: 20px;
}

#product-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.product {
  background-color: var(--card-bg);
  border-radius: 10px;
  padding: 15px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.06);
  text-align: center;
  transition: transform 0.3s ease;
}

.product:hover {
  transform: translateY(-5px);
}

.product img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: 6px;
  margin-bottom: 10px;
}

.product span {
  display: block;
  font-weight: 600;
  margin-bottom: 10px;
}

.product button {
  padding: 8px 16px;
  background-color: #2ecc71;
  color: white;
  border: none;
  border-radius: 6px;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.product button:hover {
  background-color: #27ae60;
}

#cart-items {
  margin-top: 20px;
  padding-bottom: 15px;
}

.cart-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 15px;
  background-color: var(--cart-bg);
  border-radius: 8px;
  margin-bottom: 10px;
  font-weight: 500;
}

.remove-btn {
  background-color: var(--remove-bg);
  color: white;
  border: none;
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.remove-btn:hover {
  background-color: #b92a1c;
}

#cart-total {
  text-align: center;
  margin-top: 20px;
}

#total-price {
  font-size: 1.3em;
  font-weight: bold;
  color: var(--text-color);
}

#checkout-btn {
  margin-top: 10px;
  padding: 10px 20px;
  background-color: var(--accent-color);
  border: none;
  color: white;
  font-size: 1em;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

#checkout-btn:hover {
  background-color: #216ca5;
}

#empty-cart {
  text-align: center;
  color: #888;
  font-style: italic;
}

.hidden {
  display: none;
}