* {
  box-sizing: border-box;
}

body {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  background: #faf8f5; /* 溫潤的米白色底 */
  color: #5c4d43; /* 深大地色文字，取代死黑，視覺更柔和 */
  margin: 0;
  padding: 0;
}

header {
  text-align: center;
  padding: 30px 20px;
  background: #ffffff;
  border-bottom: 1px solid #efeae4;
  box-shadow: 0 2px 15px rgba(166, 149, 133, 0.06);
}

h1 { margin: 0; font-size: 24px; letter-spacing: 2px; color: #6b5a4e; }
header p { margin: 10px 0 0 0; color: #9c8b7d; font-size: 14px; }

.container {
  display: flex;
  flex-wrap: wrap;
  max-width: 1200px;
  margin: 20px auto;
  gap: 20px;
  padding: 0 20px;
}

#products-section {
  flex: 2;
  min-width: 300px;
}

#sidebar {
  flex: 1;
  min-width: 300px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

@media (min-width: 768px) {
  #sidebar {
    margin-top: 58px; /* 往下推 58 像素來對齊左側白框 */
  }
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 15px;
}

.card {
  background: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(184, 169, 154, 0.08);
  text-align: center;
  border: 1px solid #f4f0ec;
  transition: transform 0.2s;
}

.card:hover { transform: translateY(-2px); }

.card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 8px;
  margin-bottom: 15px;
  object-fit: cover;
  background-color: #fcfbf9;
}

.card h3 { margin: 0 0 10px 0; font-size: 16px; color: #5c4d43; }
.card .price { color: #b08d6a; font-weight: bold; font-size: 18px; margin: 5px 0; }
.card .tag { font-size: 12px; color: #877463; background: #f2ebe1; padding: 4px 10px; border-radius: 20px; display: inline-block; margin-bottom: 15px;}

.btn-group button {
  background: #f4f0ec;
  color: #6b5a4e;
  border: none;
  padding: 8px 15px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  transition: 0.2s;
}
.btn-group button:hover { background: #e3d8cd; }

.cart-box, .result-box {
  background: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(184, 169, 154, 0.08);
  border: 1px solid #f4f0ec;
}

.cart-items {
  min-height: 100px;
  margin-bottom: 20px;
}

.cart-item-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px dashed #e3d8cd;
  font-size: 14px;
  color: #5c4d43;
}

.calc-btn {
  width: 100%;
  background: #b08d6a; /* 奶茶/焦糖色按鈕 */
  color: white;
  border: none;
  padding: 12px;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  font-weight: bold;
  transition: 0.2s;
}
.calc-btn:hover { background: #967655; }

.hidden { display: none; }
.result-box h2 { margin-top: 0; color: #8c735d; border-bottom: 2px solid #f4f0ec; padding-bottom: 10px;}
.total-price { font-size: 24px; color: #b08d6a; font-weight: bold; text-align: right;}

.rewards-list { 
  background: #fcfbf9; 
  padding: 15px; 
  border-radius: 8px; 
  border: 1px solid #e3d8cd; 
  list-style: none; 
  margin: 0; 
}
.rewards-list li { color: #8c735d; margin-bottom: 8px; font-weight: bold; line-height: 1.4;}

.clear-btn {
  width: 100%;
  background: #fcfbf9;
  color: #9c8b7d;
  border: 1px solid #e3d8cd;
  padding: 8px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  margin-top: 10px;
  transition: 0.2s;
}
.clear-btn:hover {
  background: #f4f0ec;
  color: #5c4d43;
}