:root {
  --page: #1b1712;
  --panel: #3b2f22;
  --raised: #4a3b2a;
  --border: #2a2118;
  --text: #f1e6c8;
  --muted: #c8b48a;
  --gold: #e6c84f;
  --danger: #c0392b;
  --success: #4caf50;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --panel-width: 360px;
}

:root { color-scheme: dark; scrollbar-color: var(--raised) var(--border); }
* { box-sizing: border-box; }
::selection { background: var(--gold); color: var(--page); }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

h1, h2, p { margin: 0; }

.app {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--panel-width);
  gap: var(--space-4);
  align-items: start;
  max-width: 1560px;
  margin: 0 auto;
  padding: var(--space-4);
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: pixelated;
  touch-action: manipulation;
}

#game {
  border: 4px solid var(--border);
  border-radius: 6px;
  background: var(--border);
}

.panel {
  position: sticky;
  top: var(--space-4);
  max-height: calc(100vh - 2 * var(--space-4));
  overflow-y: auto;
  padding: var(--space-4);
  background: var(--panel);
  border: 2px solid var(--border);
  border-radius: 6px;
}

.footer {
  padding: var(--space-2) var(--space-4) var(--space-5);
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
}

/* Buttons */

.button {
  min-height: 44px;
  padding: 0 var(--space-3);
  background: var(--raised);
  color: var(--text);
  border: 2px solid var(--border);
  border-radius: 4px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.button:hover { background: #5a4830; }
.button.big { min-height: 52px; padding: 0 var(--space-5); font-size: 1.125rem; }
.button.primary { background: var(--gold); color: var(--page); }
.button.primary:hover { background: #f0d669; }
.button.danger { background: var(--danger); }
.button.danger:hover { background: #d4493a; }
.button[aria-pressed="true"] { background: #6a5436; border-color: var(--gold); }
.button[aria-disabled="true"] { opacity: 0.6; cursor: not-allowed; }
.button:focus-visible, .shop-item:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}

/* Play panel */

.play-panel, .learn-panel { display: flex; flex-direction: column; gap: var(--space-3); }

.controls { display: grid; grid-template-columns: 1fr auto; gap: var(--space-2); }
.speeds { display: flex; gap: var(--space-1); }
.speeds .button { min-width: 44px; padding: 0 var(--space-2); }

.message { min-height: 2.9em; margin-top: calc(-1 * var(--space-1)); color: var(--muted); font-size: 0.9375rem; }

.panel-heading { font-size: 1.125rem; color: var(--gold); }

.shop { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-2); }

.shop-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  min-height: 96px;
  padding: var(--space-2) var(--space-1);
  background: var(--raised);
  color: var(--text);
  border: 2px solid var(--border);
  border-radius: 4px;
  font: inherit;
  cursor: pointer;
}
.shop-item:hover { background: #5a4830; }
.shop-item[aria-pressed="true"] { background: #6a5436; border-color: var(--gold); }
.shop-name { font-size: 0.875rem; font-weight: 600; line-height: 1.2; }
.shop-cost { font-size: 0.8125rem; color: var(--gold); }
.shop-key {
  position: absolute;
  top: 4px;
  left: 6px;
  font-size: 0.75rem;
  color: var(--muted);
}
.shop-item.unaffordable canvas { filter: grayscale(1); opacity: 0.55; }
.shop-item.unaffordable .shop-name, .shop-item.unaffordable .shop-cost { color: var(--muted); }

.selected { display: flex; flex-direction: column; gap: var(--space-2); padding-top: var(--space-3); border-top: 2px solid var(--border); }
.tier-name { color: var(--gold); font-weight: 600; }
.blurb, .stats, .hint, .label { color: var(--muted); font-size: 0.9375rem; }
.fact { color: var(--text); font-size: 0.9375rem; }
.label { margin-top: var(--space-1); }
.segmented { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-1); }
.segmented .button { padding: 0 var(--space-1); }
.row { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.row .button { flex: 1 1 auto; }

/* Watch it learn */

.progress { height: 12px; background: var(--border); border-radius: 2px; overflow: hidden; }
.progress-fill { width: 0; height: 100%; background: var(--success); }
.chart { border: 2px solid var(--border); border-radius: 4px; }
.legend { display: flex; flex-wrap: wrap; gap: var(--space-3); margin: 0; padding: 0; list-style: none; font-size: 0.875rem; color: var(--muted); }
.swatch { display: inline-block; width: 12px; height: 12px; margin-right: var(--space-1); vertical-align: -1px; border-radius: 2px; }

/* Modes */

body:not([data-mode="learn"]) .learn-panel { display: none; }
body[data-mode="learn"] .play-panel { display: none; }
body[data-mode="demo"] .panel, body[data-mode="sheet"] .panel { display: none; }
body[data-mode="demo"] .app, body[data-mode="sheet"] .app { grid-template-columns: minmax(0, 1fr); }

/* Title and end screens */

.overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  padding: var(--space-4);
  overflow-y: auto;
  background: rgba(27, 23, 18, 0.84);
}

.card {
  width: min(100%, 540px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--panel);
  border: 4px solid var(--border);
  border-radius: 8px;
  text-align: center;
}

.card h1 {
  color: var(--gold);
  font-size: clamp(2.25rem, 9vw, 3.5rem);
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.05;
  text-transform: uppercase;
  text-shadow: 0 3px 8px rgba(0, 0, 0, 0.55);
}

.subtitle { font-size: 1.125rem; }
.card .row { justify-content: center; width: 100%; }
.card .blurb { max-width: 40ch; }
.notice { padding: var(--space-2) var(--space-3); background: var(--danger); border-radius: 4px; }
.disclaimer { color: var(--muted); font-size: 0.8125rem; max-width: 46ch; }

.file-notice { margin: 12vh auto 0; }

/* Narrow screens: the panel sits under the board */

@media (max-width: 900px) {
  .app { grid-template-columns: minmax(0, 1fr); padding: var(--space-2); }
  .panel { position: static; max-height: none; }
  #game { border-width: 2px; }
}