:root {
  --hall: #e6e9ec;
  --ink: #18212d;
  --ink-soft: #4a5565;
  --stone: #ffffff;
  --kaya: #cfa25e;
  --kaya-line: #7a5a2b;
  --felt: #1e5a45;
  --felt-deep: #154434;
  --rule: #c9cfd6;
  --code-bg: #f4f6f8;
  --sans: "Familjen Grotesk", ui-sans-serif, system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--hall);
  color: var(--ink);
  font: 17px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--felt); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--felt-deep); text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--kaya); outline-offset: 2px; border-radius: 2px; }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 1rem; top: 1rem; background: var(--stone); padding: .5rem 1rem; z-index: 10; }

/* Hero ------------------------------------------------------------------ */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 3.5rem;
  align-items: center;
  max-width: 1280px;
  margin: 0 auto;
  padding: 3.5rem 2rem 4rem;
}

.wordmark {
  margin: 0 0 2.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.wordmark span { color: var(--ink-soft); font-weight: 400; }

.hero h1 {
  margin: 0 0 1.25rem;
  font-size: clamp(2.6rem, 5.2vw, 4.4rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
  font-weight: 700;
  max-width: 9ch;
}

.lede { font-size: 1.15rem; color: var(--ink-soft); max-width: 44ch; margin: 0 0 2rem; }

.links { display: flex; flex-wrap: wrap; gap: .5rem 1.4rem; align-items: center; margin: 0; }
.button, .controls button {
  display: inline-block;
  font: 600 1rem/1 var(--sans);
  padding: .8rem 1.2rem;
  background: var(--felt);
  color: var(--stone);
  border: 0;
  border-radius: 6px;
  text-decoration: none;
  cursor: pointer;
}
.button:hover, .controls button:hover { background: var(--felt-deep); color: var(--stone); }
.controls button.quiet { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1px var(--rule); }
.controls button.quiet:hover { box-shadow: inset 0 0 0 1px var(--ink); background: transparent; color: var(--ink); }
.controls button[aria-pressed="true"] { box-shadow: inset 0 0 0 2px var(--felt); color: var(--felt); }
.controls button:disabled { opacity: .5; cursor: progress; }

/* Demo ------------------------------------------------------------------ */

.demo { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 1.5rem; align-items: start; }
.tables { display: grid; grid-template-columns: 1fr 1fr; gap: 1.1rem 1rem; }
.table { margin: 0; }
.table figcaption { font-size: .85rem; font-weight: 600; margin-top: .45rem; line-height: 1.35; }
.table .status { display: block; font-weight: 400; color: var(--ink-soft); }

.board { aspect-ratio: 1; width: 100%; border-radius: 3px; overflow: hidden; }

.board.chess { display: grid; grid-template-columns: repeat(8, 1fr); background: #b9c3cc; }
.board.chess div { display: grid; place-items: center; font-size: clamp(.7rem, 1.45vw, 1.15rem); line-height: 1; color: var(--ink); }
.board.chess div.d { background: #8e9cab; }
.board.chess div.l { background: #dfe5ea; }
.board.chess div.w { color: var(--stone); text-shadow: 0 0 1px #000, 0 0 2px #000; }
.board.chess div.hl { box-shadow: inset 0 0 0 2px var(--kaya); }

.board.go { background: var(--kaya); }
.board.go svg { width: 100%; height: 100%; display: block; }

.board.c4 { background: #2b4f87; display: grid; grid-template-columns: repeat(7, 1fr); gap: 6%; padding: 6%; aspect-ratio: 7 / 6; }
.board.c4 i { border-radius: 50%; background: var(--hall); }
.board.c4 i.x { background: #e2b33a; }
.board.c4 i.o { background: #c8443a; }
.board.c4 i.last { box-shadow: 0 0 0 2px var(--stone); }

.board.poker {
  background: radial-gradient(ellipse at 50% 45%, #2a7458 0%, var(--felt) 55%, var(--felt-deep) 100%);
  display: grid; grid-template-rows: 1fr auto 1fr; padding: 8%; color: var(--stone); font-size: .8rem;
}
.board.poker .seat { display: flex; justify-content: center; align-items: center; gap: .3rem; }
.board.poker .community { display: flex; justify-content: center; gap: .2rem; min-height: 2.1em; }
.board.poker .pot { text-align: center; font-size: .75rem; opacity: .9; }
.card { display: inline-grid; place-items: center; min-width: 1.75em; height: 2.3em; padding: 0 .15em; border-radius: 3px; background: var(--stone); color: var(--ink); font: 600 .78rem/1 var(--sans); }
.card.r { color: #b3261e; }
.card.back { background: repeating-linear-gradient(45deg, #dfe5ea 0 3px, #b9c3cc 3px 6px); }
.chips { font-variant-numeric: tabular-nums; opacity: .9; margin-left: .25rem; }

.wire { display: flex; flex-direction: column; min-width: 0; }
.wire-head { display: flex; justify-content: space-between; font: 500 .78rem/1 var(--mono); padding: .6rem .8rem; background: var(--ink); color: #dfe5ea; border-radius: 6px 6px 0 0; }
#wire-body {
  margin: 0; min-height: 16rem; max-height: 24rem; overflow: auto;
  background: #222d3b; color: #dfe5ea; padding: .8rem; border-radius: 0 0 6px 6px;
  font: .72rem/1.55 var(--mono);
}
#wire-body .k { color: #9cc2e6; }
#wire-body .s { color: #e8c98f; }
.controls { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .9rem; }
.demo-note { font-size: .85rem; color: var(--ink-soft); margin: .7rem 0 0; }

/* Guide ----------------------------------------------------------------- */

.layout {
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr);
  gap: 3rem;
  max-width: 1280px;
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
  background: var(--stone);
  border-radius: 10px 10px 0 0;
}

.toc { position: sticky; top: 1.5rem; align-self: start; font-size: .92rem; max-height: calc(100vh - 3rem); overflow: auto; }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc > ul > li { margin-bottom: .55rem; }
.toc > ul > li > a { font-weight: 600; color: var(--ink); }
.toc ul ul { margin: .3rem 0 0 .8rem; padding-left: .7rem; border-left: 1px solid var(--rule); }
.toc ul ul li { margin: .2rem 0; }
.toc a { text-decoration: none; color: var(--ink-soft); }
.toc a:hover { color: var(--felt); text-decoration: underline; }

.prose { max-width: 72ch; }
.prose h2 { font-size: 2rem; letter-spacing: -0.025em; line-height: 1.1; margin: 3.5rem 0 1rem; scroll-margin-top: 1.5rem; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 1.3rem; letter-spacing: -0.01em; margin: 2.4rem 0 .6rem; scroll-margin-top: 1.5rem; }
.prose h4 { font-size: 1.05rem; margin: 1.8rem 0 .4rem; scroll-margin-top: 1.5rem; }
.prose p, .prose li { color: #26303d; }
.prose ul { padding-left: 1.2rem; }
.prose li { margin: .3rem 0; }
.prose li > ul { margin-top: .2rem; }

.prose code { font: .86em var(--mono); background: var(--code-bg); padding: .1em .3em; border-radius: 3px; }
.prose pre { background: var(--code-bg); border-left: 3px solid var(--kaya); padding: 1rem 1.1rem; overflow-x: auto; border-radius: 0 4px 4px 0; line-height: 1.5; }
.prose pre code { background: none; padding: 0; font-size: .8rem; }

.prose table { width: 100%; border-collapse: collapse; margin: 1rem 0 1.4rem; font-size: .92rem; display: block; overflow-x: auto; }
.prose th { text-align: left; font-weight: 600; border-bottom: 2px solid var(--ink); padding: .45rem .8rem .45rem 0; }
.prose td { border-bottom: 1px solid var(--rule); padding: .45rem .8rem .45rem 0; vertical-align: top; }
.prose td code { white-space: nowrap; }

.foot { max-width: 1280px; margin: 0 auto; padding: 1.5rem 2rem 3rem; background: var(--stone); border-top: 1px solid var(--rule); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; font-size: .9rem; color: var(--ink-soft); }
.foot p { margin: 0; }
.foot-links { display: flex; gap: 1.4rem; flex-wrap: wrap; }

/* Responsive ------------------------------------------------------------ */

@media (max-width: 1060px) {
  .hero { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero h1 { max-width: 14ch; }
}
@media (max-width: 760px) {
  body { font-size: 16px; }
  .hero { padding: 2rem 1.1rem 2.5rem; }
  .demo { grid-template-columns: 1fr; }
  .layout { grid-template-columns: 1fr; padding: 2rem 1.1rem 3rem; gap: 1.5rem; border-radius: 0; }
  .toc { position: static; max-height: none; border-bottom: 1px solid var(--rule); padding-bottom: 1rem; }
  .toc ul ul { display: none; }
  .toc > ul { display: flex; flex-wrap: wrap; gap: .3rem 1.1rem; }
  .toc > ul > li { margin: 0; }
  .prose h2 { font-size: 1.6rem; }
  .board.chess div { font-size: 4vw; }
}