:root {
  --paper: #f4efe6;
  --ink: #1f1b16;
  --rule: #d9d0c3;
  --ochre: #b45309;
  --ochre-soft: #edc9a3;
  --ochre-wash: #f6e4cc;
  --teal: #0f766e;
  --teal-soft: #9dcdc8;
  --wash: #d7efe9;
  --muted: #6b6258;
  --tt: #047857;
  --ff: #9f1239;
  --nat: #5b21b6;
  --qmark: #7c3d12;
  --tip: #1f1b16;
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--paper); color: var(--ink);
  font-family: Iowan Old Style, Palatino Linotype, Palatino, Charter, Georgia, serif;
  line-height: 1.55;
}
body { max-width: 68rem; margin: 0 auto; padding: 2.5rem 1.4rem 4rem; }
header.site { border-bottom: 1px solid var(--rule); padding-bottom: 1rem; margin-bottom: 2rem; }
header.site a { color: var(--ink); text-decoration: none; }
header.site nav { font-size: 0.95rem; color: var(--muted); }
header.site nav a { margin-right: 1rem; }
h1, h2, h3, h4 { font-weight: 600; letter-spacing: -0.02em; }
h1 { font-size: 2rem; margin: 0 0 0.4rem; }
h2 { font-size: 1.35rem; margin-top: 2.2rem; border-top: 1px solid var(--rule); padding-top: 1.2rem; }
h3 { font-size: 1.15rem; margin-top: 1.8rem; }
h4 { font-size: 1rem; margin: 1.2rem 0 0.4rem; color: var(--muted); }
p.lede { font-size: 1.12rem; }
a { color: var(--teal); }
code, .play, .move, .occ, .chip, .legend-item, .tok-pay, .tok-comp, .tok-addr, .who {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
code { font-size: 0.92em; }
[data-tip] { cursor: help; }
.term, .ty, .legend-item, .chip, .strat-name {
  border-bottom: 1px dotted currentColor;
  text-decoration: none;
}
.term:focus, .ty:focus, .legend-item:focus, .chip:focus, .occ:focus, .sleaf:focus, .sedge:focus, .strat-name:focus {
  outline: 2px solid var(--ink); outline-offset: 2px;
}
.catalogue { list-style: none; padding: 0; }
.catalogue li { border-top: 1px solid var(--rule); padding: 0.85rem 0; }
.catalogue a.title { font-size: 1.15rem; color: var(--ink); text-decoration: none; }
.blurb { color: var(--muted); margin: 0.3rem 0 0; }
.tyline { margin: 0.35rem 0 0.6rem; }
.chips { display: flex; flex-wrap: wrap; gap: 0.35rem; margin: 0.45rem 0 0; }
.chip {
  font-size: 0.8rem; padding: 0.05rem 0.45rem;
  border: 1px solid var(--rule); border-radius: 99px; background: #fff;
}
.legend {
  display: flex; flex-wrap: wrap; gap: 0.4rem 0.7rem;
  margin: 1rem 0 1.4rem; padding: 0.7rem 0.8rem;
  border: 1px solid var(--rule); background: #fff;
}
.legend-item { font-size: 0.82rem; padding: 0.05rem 0.2rem; }
.legend-item.pol-O { color: var(--ochre); font-weight: 700; }
.legend-item.pol-P { color: var(--teal); font-weight: 700; }
.legend-item.qa-Q { color: var(--qmark); }
.legend-item.qa-A { color: var(--tt); }
.legend-item.omega { color: var(--ff); }
.legend-item.pview { background: var(--wash); }
.trace-cap, .pview-line { font-size: 0.92rem; color: var(--muted); }
.stepper {
  margin: 0.8rem 0 1.6rem; padding: 0.8rem 0.9rem;
  border: 1px solid var(--rule); background: #fff;
}
.stepper:focus { outline: 2px solid var(--teal); outline-offset: 2px; }
.stepper-controls { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin-bottom: 0.6rem; }
button {
  font: inherit; background: transparent; color: var(--ink);
  border: 1px solid var(--ink); padding: 0.2rem 0.7rem; cursor: pointer;
}
button:hover { background: var(--ink); color: var(--paper); }
.step-status { color: var(--muted); font-variant-numeric: tabular-nums; }
.play-wrap { position: relative; padding-bottom: 1.6rem; margin: 0.4rem 0 0.6rem; }
.play-arcs { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; overflow: visible; }
.play-arcs path { fill: none; stroke: var(--muted); stroke-width: 1.15; opacity: 0.45; }
.play-arcs path.arc-ans { stroke: var(--teal); }
.play-arcs path.arc-q { stroke: var(--ochre); stroke-dasharray: 3 3; }
.play-wrap.is-tracing .play-arcs path { opacity: 0.12; }
.play-arcs path.is-hot { opacity: 1; stroke-width: 2; stroke-dasharray: none; }
.play { display: flex; flex-wrap: wrap; gap: 0.55rem 0.65rem; align-items: flex-start; position: relative; z-index: 1; }
.play::before { content: none; }
.occ {
  display: flex; flex-direction: column; align-items: center; gap: 0.12rem;
  min-width: 2.6rem; position: relative;
}
.play > .occ + .occ { padding-left: 0.55rem; }
.play > .occ + .occ::before {
  content: '·'; position: absolute; left: -0.05rem; top: 0.35rem;
  color: var(--muted); font-size: 0.9rem;
}
.move {
  border: 1px solid var(--rule); border-radius: 3px;
  padding: 0.18rem 0.38rem 0.14rem; background: #fff;
  display: inline-flex; align-items: baseline; gap: 0.08rem;
  line-height: 1.2;
}
.occ.O .move { color: var(--ochre); border-color: var(--ochre-soft); background: var(--ochre-wash); }
.occ.P .move { color: var(--teal); border-color: var(--teal-soft); background: var(--wash); }
.occ.Q .move { box-shadow: inset 0 -2px 0 var(--ochre-soft); }
.occ.A .move { box-shadow: inset 0 -2px 0 var(--teal-soft); }
.occ.is-pview .move { outline: 2px solid var(--teal); outline-offset: 1px; }
.occ.is-current .move { outline: 2px solid var(--ink); outline-offset: 1px; }
.occ.is-dim { opacity: 0.28; }
.play-wrap.is-tracing .occ { opacity: 0.38; }
.play-wrap.is-tracing .occ.is-focus,
.play-wrap.is-tracing .occ.is-justifier,
.play-wrap.is-tracing .occ.is-child { opacity: 1; }
.occ.is-focus .move { outline: 2px solid var(--ink); }
.occ.is-justifier .move { outline: 2px dashed var(--ochre); }
.occ.is-child .move { outline: 2px dashed var(--teal); }
.tok-q { font-weight: 700; }
.tok-tt { color: var(--tt); font-weight: 700; }
.tok-ff { color: var(--ff); font-weight: 700; }
.tok-nat { color: var(--nat); font-weight: 700; }
.tok-take { color: var(--teal); }
.tok-opp { color: var(--ochre); }
.tok-x { color: var(--teal); font-weight: 700; }
.tok-o { color: var(--ochre); font-weight: 700; }
.tok-res { color: var(--teal); }
.tok-arg { color: var(--ochre); }
.tok-addr { font-size: 0.85em; color: var(--nat); }
.tok-qa { font-size: 0.78em; margin-left: 0.08rem; opacity: 0.85; }
.occ-meta { display: flex; gap: 0.28rem; font-size: 0.68rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.occ-j { color: var(--ink); }
.board { display: inline-grid; gap: 2px; margin: 0.6rem 0; font-family: ui-monospace, monospace; }
.board.g3 { grid-template-columns: repeat(3, 2.1rem); }
.board span {
  width: 2.1rem; height: 2.1rem; display: grid; place-items: center;
  border: 1px solid var(--rule); background: #fff;
}
.board .mark-x { color: var(--teal); font-weight: 700; background: var(--wash); }
.board .mark-o { color: var(--ochre); font-weight: 700; background: var(--ochre-wash); }
.stones { letter-spacing: 0.15em; font-size: 1.2rem; color: var(--ochre); margin: 0.5rem 0; }
.arena { margin: 0.6rem 0 1.2rem; }
.arena-lede { color: var(--muted); font-size: 0.95rem; }
.arena-tree, .arena-tree ul { list-style: none; padding-left: 1.1rem; margin: 0.2rem 0; }
.arena-tree { padding-left: 0; }
.arena-node { margin: 0.25rem 0; padding-left: 0.6rem; border-left: 2px solid var(--rule); }
.arena-node > .occ { align-items: flex-start; }
.arena-ref { color: var(--muted); font-size: 0.85rem; font-family: ui-monospace, monospace; }
.sroot { font-family: ui-monospace, monospace; color: var(--muted); margin-bottom: 0.35rem; }
.stree { overflow-x: auto; padding: 0.4rem 0 1rem; }
.snode { margin: 0.35rem 0 0.35rem 0.2rem; }
.skids { margin: 0.25rem 0 0.25rem 0.4rem; }
.skids.polarity-O { border-left: 3px solid var(--ochre-soft); padding-left: 0.65rem; }
.skids.polarity-P { border-left: 3px solid var(--teal-soft); padding-left: 0.65rem; }
.skids.is-collapsed > .skid-list { display: none; }
.fold {
  font-size: 0.8rem; margin: 0.2rem 0 0.35rem;
  border-style: dashed; color: var(--muted);
}
.sedge { display: flex; align-items: baseline; gap: 0.4rem; margin: 0.35rem 0 0.15rem; font-size: 0.9rem; }
.who { font-weight: 700; min-width: 1.1rem; }
.skid.polarity-O > .sedge .who { color: var(--ochre); }
.skid.polarity-P > .sedge .who { color: var(--teal); }
.sleaf { display: inline-block; margin: 0.3rem 0; padding: 0.1rem 0.45rem; border: 1px dashed var(--rule); font-family: ui-monospace, monospace; }
.sleaf.omega { color: var(--ff); border-color: #f0c3cf; }
.sleaf.bound { color: var(--muted); }
.strategy { margin-bottom: 2.2rem; }
#tip {
  position: fixed; max-width: 22rem; padding: 0.5rem 0.7rem;
  background: var(--tip); color: var(--paper); font-size: 0.85rem;
  line-height: 1.4; pointer-events: none; z-index: 20;
  box-shadow: 0 8px 24px rgba(31,27,22,0.25);
}
#tip strong { display: block; margin-bottom: 0.25rem; font-size: 0.9rem; }
#tip div { color: #e8e0d4; }
footer { margin-top: 3rem; border-top: 1px solid var(--rule); padding-top: 1rem; color: var(--muted); font-size: 0.9rem; }
@media (max-width: 640px) {
  body { padding: 1.4rem 0.9rem 3rem; }
  .legend { padding: 0.5rem; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
}