:root {
  --ink: #d7eaf4;
  --muted: #7e9aaa;
  --bg: #07131c;
  --card: #0b1a24;
  --line: #163e48;
  --cyan: #22d3ee;
}
* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  font: 15px/1.45 Segoe UI, sans-serif;
  color: var(--ink);
  background: var(--bg);
}
header, main { position: relative; z-index: 1; max-width: 1100px; margin: 0 auto; padding: 20px; }
.headrow { display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: baseline; justify-content: space-between; }
h1 { margin: 0; font-size: 28px; }
.sub, .note, #status { color: var(--muted); }
main { display: grid; grid-template-columns: minmax(260px, 360px) 1fr; gap: 16px; max-width: 1100px; }
form, .preview {
  display: grid;
  gap: 12px;
  align-content: start;
  background: var(--card);
  border: 1px solid var(--line);
  padding: 16px;
}
.preview { min-height: 520px; }
#view3d { height: 480px; background: #061018; border: 1px solid var(--line); }
.actions { display: flex; flex-wrap: wrap; gap: 8px; }
.note { grid-column: 1 / -1; }
@media (max-width: 800px) {
  main { grid-template-columns: 1fr; }
}
label { display: grid; gap: 4px; }
input, select, button {
  font: inherit;
  color: var(--ink);
  background: #061018;
  border: 1px solid var(--line);
  padding: 8px;
}
button { background: var(--cyan); color: #041016; border: 0; font-weight: 700; cursor: pointer; }
button:disabled { opacity: 0.6; }
a { color: var(--cyan); }
.who { display: flex; gap: 12px; align-items: center; }