:root {
  color-scheme: dark;
  --basalt: #16110d;
  --panel: #2b2118;
  --panel-2: #332719;
  --line: #6d5233;
  --paper: #f2ede6;
  --sand: #e5d2ad;
  --muted: #bda985;
  --rust: #b0603a;
  --ochre: #d7a74c;
  --cyan: #4db8d4;
  --mono: "Courier New", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  min-width: 20rem;
  margin: 0;
  color: var(--sand);
  background:
    radial-gradient(circle at 82% 2%, #b0603a2f, transparent 34rem),
    linear-gradient(180deg, #101715, var(--basalt) 30rem);
  font-family: "Trebuchet MS", Tahoma, system-ui, sans-serif;
}

a { color: var(--paper); }

a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 5;
  top: 0;
  left: 0;
  padding: 0.7rem 0.9rem;
  color: var(--basalt);
  background: var(--paper);
  transform: translateY(-120%);
}

.skip-link:focus { transform: translateY(0); }

.spec-header,
main,
footer {
  width: min(76rem, calc(100% - 2rem));
  margin-inline: auto;
}

.spec-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  padding: clamp(2.4rem, 8vw, 6rem) 0 2rem;
}

h1,
h2,
p { margin-top: 0; }

h1 {
  max-width: 17ch;
  margin-bottom: 0.6rem;
  color: var(--paper);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.4rem, 7vw, 5.7rem);
  line-height: 0.92;
}

h2 {
  margin-bottom: 0.55rem;
  color: var(--paper);
  font-size: clamp(1.25rem, 3vw, 2rem);
}

.spec-header p:not(.eyebrow) {
  max-width: 42rem;
  color: var(--muted);
  line-height: 1.55;
}

.eyebrow {
  margin-bottom: 0.55rem;
  color: var(--ochre);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.game-link {
  flex: 0 0 auto;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line);
  background: #2b2118cc;
  font-family: var(--mono);
  font-size: 0.78rem;
  text-decoration: none;
}

.spec-links {
  display: flex;
  flex: 0 0 auto;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.55rem;
}

main {
  display: grid;
  min-width: 0;
  gap: 1rem;
}

.decision,
.board-card,
.pipeline-card,
.rules,
.palette-card {
  min-width: 0;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #332719ed, #211913f5);
  box-shadow: 0 1.2rem 3rem #00000055;
}

.decision {
  display: grid;
  grid-template-columns: minmax(16rem, 0.8fr) minmax(20rem, 1.2fr);
  gap: 2rem;
  padding: clamp(1.2rem, 4vw, 2rem);
}

.decision p:last-child {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.spec-grid article {
  display: grid;
  gap: 0.28rem;
  min-height: 8.2rem;
  padding: 1.15rem;
  background: var(--panel);
}

.spec-grid span,
.spec-grid small {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.spec-grid strong {
  align-self: end;
  color: var(--paper);
  font-size: 1.15rem;
}

.board-card,
.pipeline-card,
.rules,
.palette-card { padding: clamp(1rem, 3vw, 1.6rem); }

.section-head {
  display: flex;
  min-width: 0;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

fieldset {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 0;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.72rem;
}

legend { padding: 0 0.3rem; color: var(--muted); }

label { display: inline-flex; align-items: center; gap: 0.35rem; }

.canvas-wrap {
  width: 100%;
  min-width: 0;
  max-width: 100%;
  overflow: auto;
  border: 1px solid #4b3826;
  background: #15100d;
}

canvas {
  display: block;
  width: 100%;
  min-width: 46rem;
  height: auto;
}

.sprite-wrap canvas { min-width: 40rem; }

#grid-caption,
#sprite-caption,
footer p {
  margin: 0.8rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.55;
}

output {
  padding: 0.4rem 0.55rem;
  border: 1px solid #4b3826;
  color: var(--cyan);
  background: #17120f;
  font-family: var(--mono);
  font-size: 0.75rem;
}

.rules ol {
  display: grid;
  gap: 0.75rem;
  margin: 1rem 0 0;
  padding-left: 1.35rem;
  color: var(--muted);
  line-height: 1.55;
}

code {
  color: var(--paper);
  font-family: var(--mono);
  overflow-wrap: anywhere;
}

.rules li { min-width: 0; overflow-wrap: anywhere; }

.palette {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.55rem;
}

.swatch {
  min-height: 6.5rem;
  padding: 0.65rem;
  border: 1px solid #ffffff24;
  color: white;
  font-family: var(--mono);
  font-size: 0.68rem;
  text-shadow: 0 1px 3px black;
}

.swatch b { display: block; margin-bottom: 0.2rem; }

footer { padding: 1.4rem 0 3rem; }

@media (max-width: 760px) {
  .spec-header,
  .decision,
  .section-head { align-items: stretch; flex-direction: column; }
  .spec-header { display: flex; }
  .game-link { align-self: flex-start; }
  .spec-links { justify-content: flex-start; }
  .decision { grid-template-columns: 1fr; gap: 0.4rem; }
  .spec-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .palette { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  fieldset { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}