:root {
  color-scheme: light;
  --bg: #f7f7f8;
  --card: #ffffff;
  --text: #1a1a1a;
  --muted: #666;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #e4e4e7;
  --danger: #dc2626;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

header a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}

.cart-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}

.product-card, .cart-item, .panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}

.product-card img, .cart-item img {
  width: 100%;
  border-radius: 8px;
  margin-bottom: 12px;
}

.cart-item {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 12px;
}

.cart-item img { width: 90px; margin: 0; }
.cart-item .info { flex: 1; }

button, .btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}

button:hover, .btn:hover { background: var(--accent-hover); }

button.secondary {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--border);
}

.qty {
  width: 50px;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  text-align: center;
}

.upsell {
  border: 1px dashed var(--accent);
  border-radius: 10px;
  padding: 14px;
  margin: 20px 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.total-row {
  display: flex;
  justify-content: space-between;
  font-size: 18px;
  font-weight: 700;
  margin: 20px 0;
}

.muted { color: var(--muted); font-size: 14px; }
.empty { text-align: center; padding: 60px 0; color: var(--muted); }
.status { padding: 12px; border-radius: 8px; margin-bottom: 16px; }
.status.error { background: #fee2e2; color: var(--danger); }