:root {
  --fg: #1a1a1a;
  --muted: #666;
  --line: #d0d0d0;
  --accent: #1f4e79;
  --error: #b00020;
}
* { box-sizing: border-box; }
body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--fg);
  background: #f4f5f7;
  margin: 0;
  padding: 2rem 1rem;
  line-height: 1.5;
}
.card {
  max-width: 32rem;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.5rem 1.75rem;
}
h1 { font-size: 1.4rem; margin: 0 0 0.5rem; }
p { margin: 0.4rem 0; }
.muted { color: var(--muted); font-size: 0.9rem; }
.vendor { font-weight: 600; font-size: 1.1rem; margin-bottom: 1rem; }
.error { color: var(--error); font-weight: 600; }
hr { border: none; border-top: 1px solid var(--line); margin: 1.25rem 0; }
label { display: block; margin-top: 0.9rem; font-weight: 600; font-size: 0.9rem; }
input[type="text"] {
  width: 100%;
  padding: 0.55rem 0.6rem;
  margin-top: 0.25rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 1rem;
}
button {
  margin-top: 1.25rem;
  width: 100%;
  padding: 0.7rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
}
button:hover { background: #163a5a; }