:root {
  --bg: #f7fafc;
  --panel: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --border: #e2e8f0;
  --code-bg: #f8fafc;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial;
  background: var(--bg);
  color: var(--text);
}
.header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px; background: var(--panel); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand .logo { font-size: 20px; }
.brand h1 { font-size: 16px; margin: 0; }
.gh { color: var(--muted); text-decoration: none; border: 1px solid var(--border); padding: 6px 10px; border-radius: 6px; }

.wrap { padding: 16px; }
.hero { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 16px; }
.hero h2 { margin: 0 0 6px; }
.muted { color: var(--muted); }

.grid { display: grid; grid-template-columns: 360px 1fr; gap: 16px; margin-top: 16px; }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 16px; }
.field { display: grid; gap: 6px; margin-bottom: 10px; }
label { color: var(--muted); font-size: 12px; }
select, input { width: 100%; border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; background: #fbfdff; }
.stack { display: grid; gap: 10px; }
.actions { display: flex; gap: 8px; margin-top: 8px; }

.btn { border: 1px solid var(--border); background: #f1f5f9; color: var(--text); padding: 8px 12px; border-radius: 8px; cursor: pointer; }
.btn.small { padding: 6px 10px; }
.btn.primary { background: var(--primary); color: #fff; border-color: var(--primary); }

.preview-head { display: flex; align-items: center; justify-content: space-between; }
.preview-head h3 { margin: 8px 0; font-size: 14px; color: var(--muted); }
.row { display: flex; gap: 8px; }
.space { margin-top: 12px; }
.code { background: var(--code-bg); color: #111827; border: 1px solid var(--border); border-radius: 10px; padding: 12px; min-height: 200px; overflow: auto; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 13px; }

.footer { padding: 12px 16px; color: var(--muted); margin-top: 16px; }

@media (max-width: 1024px) {
  .grid { grid-template-columns: 1fr; }
}