:root { --ink: #1e293b; --muted: #64748b; --line: #e2e8f0; --brand: #2563eb; }
* { box-sizing: border-box; }
body {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--ink); margin: 0; background: #f1f5f9;
}
header { background: #0f172a; color: #fff; padding: 1.5rem 2rem; }
header h1 { margin: 0 0 0.25rem; }
header p { margin: 0; color: #cbd5e1; font-size: 0.9rem; }
main { max-width: 880px; margin: 1.5rem auto; padding: 0 1rem; }
footer { max-width: 880px; margin: 2rem auto; padding: 0 1rem; color: var(--muted); font-size: 0.8rem; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 1.25rem;
  display: flex; flex-direction: column; gap: 0.75rem;
}
.card h3 { margin: 0; }
.price { font-size: 1.4rem; font-weight: 700; font-variant-numeric: tabular-nums; }
button {
  margin-top: auto; background: var(--brand); color: #fff; border: none;
  padding: 0.6rem 1rem; border-radius: 8px; font-size: 0.95rem; cursor: pointer;
}
button:hover { filter: brightness(1.05); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.banner { padding: 0.85rem 1rem; border-radius: 10px; margin-bottom: 1.25rem; font-size: 0.95rem; background: #e2e8f0; }
.banner.ok { background: #dcfce7; color: #166534; }
.banner.warn { background: #fef3c7; color: #92400e; }
.banner.err { background: #fee2e2; color: #991b1b; }

.muted { color: var(--muted); }
.cart { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 1.25rem; margin-top: 1.5rem; }
.cart h2 { margin: 0 0 1rem; font-size: 1.1rem; }
.cart table { width: 100%; border-collapse: collapse; }
.cart td { padding: 0.5rem 0.25rem; border-bottom: 1px solid var(--line); }
.cart td.num { text-align: right; font-variant-numeric: tabular-nums; }
.cart td.qty { white-space: nowrap; }
.cart td.qty button {
  margin: 0; padding: 0 0.55rem; font-size: 1rem; line-height: 1.6; background: #e2e8f0; color: var(--ink);
}
.cart .total { text-align: right; font-size: 1.2rem; margin: 1rem 0; }
#checkout { width: 100%; margin: 0; padding: 0.75rem; font-size: 1rem; }