* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: #f6f7f9;
  color: #222;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: #1f2937;
  color: #fff;
}

header h1 { font-size: 20px; margin: 0; }

.status { font-size: 14px; opacity: .8; }
.status.ok  { color: #4ade80; opacity: 1; }
.status.err { color: #f87171; opacity: 1; }

main {
  max-width: 900px;
  margin: 24px auto;
  padding: 0 16px;
  display: grid;
  gap: 24px;
}

section {
  background: #fff;
  padding: 16px;
  border-radius: 8px;
  box-shadow: 0 1px 2px rgba(0,0,0,.06);
}

h2 { margin: 0 0 12px; font-size: 18px; }

form {
  display: grid;
  grid-template-columns: 1fr 2fr auto auto;
  gap: 8px;
}

input {
  padding: 8px 10px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  font-size: 14px;
}

button {
  padding: 8px 14px;
  border: 0;
  border-radius: 6px;
  background: #2563eb;
  color: #fff;
  cursor: pointer;
  font-size: 14px;
}

button:hover { background: #1d4ed8; }
button.danger { background: #ef4444; }
button.danger:hover { background: #dc2626; }

.error { color: #b91c1c; margin: 8px 0 0; font-size: 14px; }
.empty { color: #6b7280; }

#products {
  display: grid;
  gap: 12px;
}

.card {
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 12px 16px;
}

.card h3 { margin: 0 0 6px; font-size: 16px; }
.card .desc { margin: 0 0 8px; color: #4b5563; font-size: 14px; }
.card .price { margin: 0 0 10px; font-weight: 600; }

@media (max-width: 640px) {
  form { grid-template-columns: 1fr; }
}
.home-link {
  color: inherit;
  text-decoration: none;
}

.card h3 a {
  color: inherit;
  text-decoration: none;
}

.card h3 a:hover {
  text-decoration: underline;
}

.product-detail h2 {
  margin: 0 0 8px;
  font-size: 24px;
}

.product-detail .desc {
  color: #4b5563;
  margin: 0 0 12px;
}

.product-detail .price {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 8px;
}

.product-detail .meta {
  color: #6b7280;
  font-size: 14px;
  margin: 0 0 20px;
}

.back-link {
  color: #2563eb;
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}