:root {
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --border: #d2d2d7;
  --accent: #0071e3;
  --danger: #b42318;
  --radius: 18px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, #ffffff 0%, var(--bg) 55%);
}

.shell {
  max-width: 1120px;
  margin: 48px auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 8px 30px rgba(0,0,0,.06);
}

.eyebrow { color: var(--muted); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
h1 { margin: 8px 0 8px; font-size: 32px; }
.sub { margin: 0 0 24px; color: var(--muted); }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field.full { grid-column: 1 / -1; }
.field span { font-size: 14px; font-weight: 600; }
.field em { color: var(--accent); font-style: normal; }
.hint { color: var(--muted); font-size: 12px; }

input, select, textarea {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 11px 12px;
  font-size: 15px;
  background: #fff;
  transition: border-color .15s ease, box-shadow .15s ease;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: color-mix(in srgb, var(--accent) 60%, #fff);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 16%, #fff);
}

.actions { margin-top: 18px; display: flex; gap: 10px; }
button { border: 0; border-radius: 999px; padding: 10px 16px; font-weight: 600; cursor: pointer; }
button.primary { background: var(--accent); color: #fff; }
button.ghost { background: #ececf0; color: #1d1d1f; }
.error { min-height: 20px; margin-top: 8px; color: var(--danger); font-size: 14px; }

pre {
  background: #fafafa;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  overflow: auto;
  min-height: 260px;
}

@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; margin: 20px auto; }
  .grid { grid-template-columns: 1fr; }
}