/* Drafting-table instrument: blueprint-grey paper, india ink, registration red. */

:root {
  --paper: #e8ecf1;
  --paper-deep: #dde3ea;
  --ink: #1b2430;
  --ink-soft: #4a5568;
  --grid-line: #c3cedb;
  --registration: #c22e1f;
  --pane-bg: #f4f6f9;
}

* { box-sizing: border-box; margin: 0; }

body {
  background: var(--paper);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header { padding: 2rem 2.5rem 1rem; }

h1 {
  font-family: "Iowan Old Style", Palatino, "Palatino Linotype", Georgia, serif;
  font-weight: 500;
  font-size: 2.1rem;
  letter-spacing: 0.01em;
}

h1 .amp { font-style: italic; color: var(--registration); }

.subtitle {
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-top: 0.4rem;
}

main {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 1rem 2.5rem 2rem;
  align-items: flex-start;
}

.pane {
  background: var(--pane-bg);
  border: 1px solid var(--ink);
  box-shadow: 4px 4px 0 rgba(27, 36, 48, 0.14);
  padding: 1rem 1.25rem 1.25rem;
  /* Small flex-basis so the two panes stay side by side well into tablet
     widths; the canvases scale down with them (width: 100%). */
  flex: 1 1 320px;
  min-width: 0;
  max-width: 640px;
}

.pane-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

h2 {
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hint { font-size: 0.75rem; color: var(--ink-soft); }

.reg-mark {
  display: inline-block;
  width: 0.7em; height: 0.7em;
  border: 2px solid var(--registration);
  vertical-align: baseline;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  background: white;
  border: 1px solid var(--ink);
  cursor: crosshair;
}

#wallpaper { cursor: default; }

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  align-items: center;
  margin-top: 0.75rem;
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 0.78rem;
}

label { display: inline-flex; gap: 0.4rem; align-items: center; letter-spacing: 0.06em; }

select, button, #grid-size {
  font: inherit;
  background: white;
  color: var(--ink);
  border: 1px solid var(--ink);
  padding: 0.25rem 0.6rem;
  cursor: pointer;
}

#grid-size { width: 4rem; cursor: text; }

button:hover, select:hover, #grid-size:hover { background: var(--paper-deep); }

button:focus-visible, select:focus-visible, #grid-size:focus-visible,
a:focus-visible {
  outline: 2px solid var(--registration);
  outline-offset: 2px;
}

#piece-list {
  list-style: none;
  margin-top: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

#piece-list li {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.75rem;
  border: 1px solid var(--ink-soft);
  background: white;
  padding: 0.15rem 0.3rem 0.15rem 0.5rem;
  cursor: pointer;
}

#piece-list li:hover {
  border-color: var(--registration);
  box-shadow: 2px 2px 0 rgba(194, 46, 31, 0.35);
}

#piece-list .swatch {
  width: 0.75em; height: 0.75em;
  border: 1px solid var(--ink);
  display: inline-block;
}

#piece-list button {
  border: none;
  padding: 0 0.25rem;
  font-size: 0.9em;
  background: none;
}

#piece-list button:hover { color: var(--registration); background: none; }

#status {
  min-height: 1.2em;
  margin-top: 0.6rem;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.75rem;
  color: var(--registration);
}

#readout {
  margin-top: 0.9rem;
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.3rem 1.2rem;
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 0.78rem;
}

#readout dt {
  color: var(--ink-soft);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 0.7rem;
  align-self: baseline;
}

#readout dd { word-break: break-word; }

footer {
  margin-top: auto;
  padding: 1rem 2.5rem 1.5rem;
  font-size: 0.78rem;
  color: var(--ink-soft);
  max-width: 72rem;
}

footer a { color: var(--ink); }

@media (max-width: 900px) {
  header { padding: 1.5rem 1.25rem 0.75rem; }
  main, footer { padding-left: 1.25rem; padding-right: 1.25rem; }
}

@media (max-width: 560px) {
  header, main, footer { padding-left: 0.75rem; padding-right: 0.75rem; }
  main { gap: 1rem; }
  .pane { padding: 0.75rem; max-width: none; }
  h1 { font-size: 1.7rem; }
}

@media (prefers-reduced-motion: no-preference) {
  canvas { transition: opacity 120ms ease; }
}