:root {
  --bg: #f4efe6;
  --panel: #fffdf8;
  --text: #241d19;
  --muted: #645a50;
  --border: #ddd2c2;
  --accent: #a8322d;
  --accent-text: #ffffff;
  --focus: #2d6cdf;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15120f;
    --panel: #1e1a16;
    --text: #ece5da;
    --muted: #a99e90;
    --border: #352e27;
    --accent: #e8836f;
    --accent-text: #15120f;
    --focus: #7fa8ff;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

header,
main,
footer {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  padding-top: 20px;
}

h1 {
  margin: 0;
  font-size: 1.7rem;
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 4px 0 16px;
  color: var(--muted);
  max-width: 74ch;
}

main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 20px;
  align-items: start;
}

.stage {
  min-width: 0;
}

.canvas-wrap {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  line-height: 0;
  background: var(--panel);
}

canvas {
  image-rendering: pixelated;
}

#output {
  display: block;
  width: 100%;
  height: auto;
}

.progress {
  height: 4px;
  margin-top: 6px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.progress div {
  height: 100%;
  width: 0;
  background: var(--accent);
}

.status {
  min-height: 1.5em;
  margin: 8px 0 0;
  font-variant-numeric: tabular-nums;
}

.hint,
.note {
  color: var(--muted);
  font-size: 0.88rem;
  margin: 6px 0 0;
}

.atlas-title {
  margin: 16px 0 6px;
  font-size: 1rem;
}

.atlas {
  display: block;
  max-width: 100%;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

fieldset {
  margin: 0;
  padding: 10px 14px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
}

legend {
  padding: 0 6px;
  font-weight: 600;
}

label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  font-size: 0.92rem;
}

label.check {
  justify-content: flex-start;
}

output {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

select,
input[type='range'] {
  width: 100%;
  margin-top: 4px;
}

label select {
  width: auto;
  margin-top: 0;
}

input[type='number'] {
  width: 5.5em;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 6px;
}

input[type='range'],
input[type='checkbox'],
input[type='radio'] {
  accent-color: var(--accent);
}

input[type='color'] {
  width: 3em;
  height: 1.9em;
  padding: 0 2px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
}

select,
button {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
}

button {
  cursor: pointer;
}

button:hover {
  filter: brightness(1.05);
}

button:disabled {
  opacity: 0.5;
  cursor: default;
}

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

.row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.row label,
.row .grow {
  flex: 1;
}

#output.drawing {
  cursor: crosshair;
  touch-action: none;
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px 8px;
  margin-top: 6px;
}

.segmented label {
  justify-content: flex-start;
  margin-top: 4px;
}

.editor {
  display: block;
  width: 100%;
  margin-top: 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: crosshair;
  touch-action: none;
}

.swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.swatches button {
  width: 28px;
  height: 28px;
  padding: 0;
  border: 2px solid var(--border);
  border-radius: 6px;
}

.swatches button[aria-checked='true'] {
  border-color: var(--text);
  box-shadow: 0 0 0 2px var(--panel) inset;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

footer {
  margin-top: 24px;
  padding-bottom: 24px;
  color: var(--muted);
  font-size: 0.88rem;
}

footer a {
  color: inherit;
}

@media (max-width: 860px) {
  main {
    grid-template-columns: minmax(0, 1fr);
  }
}