:root {
  --bg: #0c0c12;
  --panel: #15151e;
  --line: #2a2a38;
  --text: #e6e4ee;
  --muted: #9a97ab;
  --accent: #ffbe3c;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif;
}

header {
  padding: 14px 20px 6px;
}

h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: 0.02em;
}

header p {
  margin: 4px 0 0;
  color: var(--muted);
}

main {
  display: grid;
  grid-template-columns: 1fr 290px;
  gap: 16px;
  padding: 10px 20px 20px;
}

.planes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  min-width: 0;
}

.plane {
  margin: 0;
  min-width: 0;
}

figcaption {
  font-weight: 600;
  margin-bottom: 6px;
}

.hint {
  font-weight: 400;
  color: var(--muted);
  font-size: 12px;
  margin-left: 6px;
}

.stack {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  background: #000;
}

.stack canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.overlay {
  cursor: crosshair;
  touch-action: none;
}

.overlay:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.status {
  margin: 6px 0 0;
  min-height: 1.4em;
  color: var(--muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.status.warn {
  color: var(--accent);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  align-self: start;
}

.panel section + section {
  border-top: 1px solid var(--line);
  margin-top: 12px;
  padding-top: 10px;
}

h2 {
  margin: 0 0 8px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

label {
  display: block;
  margin: 8px 0;
}

label.row {
  display: flex;
  align-items: center;
  gap: 6px;
}

select, input[type=range] {
  display: block;
  width: 100%;
  margin-top: 3px;
}

select, button {
  background: #1f1f2b;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 5px 6px;
  font: inherit;
}

button {
  cursor: pointer;
}

button:hover, select:hover {
  border-color: #4a4a60;
}

button.wide {
  width: 100%;
  margin-top: 8px;
}

.buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.readout {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3px 10px;
  margin: 0 0 8px;
  font-variant-numeric: tabular-nums;
}

.readout dt {
  color: var(--muted);
}

.readout dd {
  margin: 0;
  overflow-wrap: anywhere;
}

.note {
  color: var(--muted);
  font-size: 12.5px;
  margin: 4px 0 0;
}

.keys {
  color: var(--muted);
  font-size: 12px;
  margin: 10px 0 0;
}

kbd {
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 0 4px;
  font-size: 11px;
}

@media (max-width: 1000px) {
  main { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .planes { grid-template-columns: 1fr; }
  header, main { padding-left: 12px; padding-right: 12px; }
}