:root {
  --bg: #08090b;
  --bg-2: #0e0f12;
  --sq-dark: #0b0c0f;
  --sq-light: #16171b;
  --ink: #f0ece3;
  --muted: #92918c;
  --faint: #5b5a56;
  --gold: #c9a45c;
  --gold-2: #e2c585;
  --bronze: #876344;
  --win: #77af96;
  --loss: #ca7770;
  --line: rgba(201, 164, 92, 0.22);
  --line-soft: rgba(240, 236, 227, 0.08);
  --rail: 76px;
  --display: "Cinzel", "Times New Roman", serif;
  --body: "Manrope", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
html, body { margin: 0; background: var(--bg); color: var(--ink); overflow-x: hidden; }
body { font: 400 16px/1.6 var(--body); }
img { max-width: 100%; display: block; }
a { color: inherit; }
code { font: 500 0.88em var(--mono); color: var(--gold-2); }
h1, h2, h3 { font-family: var(--display); font-weight: 600; margin: 0; letter-spacing: 0.04em; }
main { padding-left: var(--rail); }

/* ---- the rail: board coordinates ---------------------------------------------------- */
.rail {
  position: fixed; inset: 0 auto 0 0; width: var(--rail); z-index: 30;
  display: flex; flex-direction: column; justify-content: center; gap: 2px;
  border-right: 1px solid var(--line-soft);
  background: linear-gradient(90deg, rgba(8,9,11,0.92), rgba(8,9,11,0.55));
  backdrop-filter: blur(6px);
}
.rail a {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 10px 0; text-decoration: none; color: var(--faint);
  transition: color .25s;
}
.rail b { font: 600 20px/1 var(--display); }
.rail span { font: 600 9px/1 var(--body); letter-spacing: .18em; text-transform: uppercase; }
.rail a:hover, .rail a.on { color: var(--gold); }
.rail a.on b { text-shadow: 0 0 18px rgba(201,164,92,.55); }

/* ---- the seat: wallet --------------------------------------------------------------- */
.seat {
  position: fixed; top: 16px; right: 18px; z-index: 40;
  display: flex; align-items: center; gap: 10px;
}
.seat-status {
  display: inline-flex; align-items: center; gap: 8px;
  font: 500 12px/1 var(--mono); color: var(--muted);
  padding: 9px 12px; border: 1px solid var(--line-soft); border-radius: 999px;
  background: rgba(8,9,11,.7); backdrop-filter: blur(6px);
}
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--gold); box-shadow: 0 0 10px var(--gold); }
.dot.live { background: var(--win); box-shadow: 0 0 10px var(--win); }

/* ---- buttons -------------------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: 700 13px/1 var(--body); letter-spacing: .14em; text-transform: uppercase;
  padding: 15px 22px; border-radius: 2px; border: 1px solid var(--line);
  color: var(--ink); background: transparent; text-decoration: none; cursor: pointer;
  transition: background .2s, border-color .2s, color .2s, transform .2s;
}
.btn:hover { border-color: var(--gold); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.gold {
  color: #16110a; border-color: transparent;
  background: linear-gradient(180deg, var(--gold-2), var(--gold) 55%, #a8843f);
  box-shadow: 0 10px 30px -12px rgba(201,164,92,.7), inset 0 1px 0 rgba(255,255,255,.35);
}
.btn.gold:hover { background: linear-gradient(180deg, #efd9a3, var(--gold-2) 55%, var(--gold)); }
.btn.ghost { background: rgba(8,9,11,.45); backdrop-filter: blur(4px); }
.btn.plate { padding: 11px 16px; background: rgba(8,9,11,.7); backdrop-filter: blur(6px); }
.btn.wide { width: 100%; margin-top: 22px; padding: 18px; }
.link { color: var(--gold-2); text-underline-offset: 4px; }

/* ---- rank sections ------------------------------------------------------------------ */
.rank { position: relative; padding: 120px clamp(18px, 5vw, 80px); border-top: 1px solid var(--line-soft); }
.rank-head { display: flex; align-items: flex-start; gap: 22px; margin-bottom: 44px; flex-wrap: wrap; }
.rank-no {
  font: 600 64px/0.8 var(--display); color: transparent;
  -webkit-text-stroke: 1px var(--gold); opacity: .8; min-width: 56px;
}
.rank-head h2 { font-size: clamp(30px, 4vw, 48px); line-height: 1.05; }
.rank-lede { margin: 10px 0 0; color: var(--muted); max-width: 60ch; }
.kicker { font: 600 11px/1 var(--body); letter-spacing: .22em; text-transform: uppercase; color: var(--gold); }
.fine { color: var(--muted); font-size: 13px; line-height: 1.55; }
.hint { color: var(--muted); font-size: 13px; margin: 8px 0 0; min-height: 1.2em; }

/* ---- rank 1: arena ------------------------------------------------------------------ */
.arena { min-height: 100svh; padding: 0; border: 0; display: flex; flex-direction: column; justify-content: flex-end; overflow: hidden; }
.arena-bg, .arena-bg img { position: absolute; inset: 0; width: 100%; height: 100%; }
.arena-bg img { object-fit: cover; object-position: 70% 50%; }
.arena-veil {
  position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(8,9,11,.92) 0%, rgba(8,9,11,.62) 34%, rgba(8,9,11,0) 62%),
    linear-gradient(0deg, var(--bg) 0%, rgba(8,9,11,.2) 34%, rgba(8,9,11,0) 60%);
}
.arena-inner { position: relative; z-index: 1; padding: 0 clamp(18px, 5vw, 80px); max-width: 1240px; margin-bottom: 36px; }
.arena-mark { width: 72px; height: 72px; border-radius: 50%; border: 1px solid var(--line); margin-bottom: 26px; }
.wordmark {
  font: 600 clamp(38px, 7.4vw, 120px)/0.92 var(--display); white-space: nowrap; display: inline-block; max-width: 100%;
  letter-spacing: 0.06em; text-transform: uppercase;
  background: linear-gradient(180deg, #f6efe0 0%, #d9c9a6 48%, #9d7b45 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 8px 30px rgba(0,0,0,.6));
}
.arena-line { font: 500 clamp(18px, 2vw, 24px)/1.45 var(--body); margin: 22px 0 0; max-width: 34ch; }
.arena-line em { font-style: normal; color: var(--gold-2); }
.arena-sub { color: var(--muted); margin: 14px 0 0; max-width: 56ch; }
.arena-cta { display: flex; gap: 12px; margin-top: 30px; flex-wrap: wrap; }

.tape { position: relative; z-index: 1; padding: 0 clamp(18px, 5vw, 80px) 36px; }
.tape-head { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.tape-note { font: 400 12px/1 var(--mono); color: var(--muted); }
.tape-row { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border: 1px solid var(--line); }
.tape-row li {
  padding: 16px 18px; background: rgba(8,9,11,.62); backdrop-filter: blur(8px);
  border-right: 1px solid var(--line-soft); min-width: 0;
}
.tape-row li:last-child { border-right: 0; }
.tape-row .m { font: 600 15px/1 var(--display); letter-spacing: .08em; }
.tape-row .l { font: 500 11px/1 var(--body); color: var(--muted); margin-left: 6px; }
.tape-row .p { font: 500 clamp(16px, 1.6vw, 22px)/1.1 var(--mono); margin-top: 10px; display: block; }
.tape-row .s { font: 400 11px/1 var(--mono); color: var(--muted); margin-top: 6px; display: block; }

/* ---- rank 2: the board ------------------------------------------------------------ */
.filters { margin-left: auto; display: flex; gap: 6px; flex-wrap: wrap; align-self: flex-end; }
.chip {
  font: 600 11px/1 var(--body); letter-spacing: .14em; text-transform: uppercase;
  padding: 10px 14px; border: 1px solid var(--line-soft); background: transparent; color: var(--muted);
  border-radius: 999px; cursor: pointer;
}
.chip.on, .chip:hover { color: var(--ink); border-color: var(--gold); }
.board-wrap { border: 1px solid var(--line); padding: 10px; background: linear-gradient(180deg, #121316, #0a0b0d); box-shadow: 0 40px 80px -40px #000; }
.board { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); }
.sq {
  position: relative; aspect-ratio: 1; min-width: 0; padding: 10px; overflow: hidden;
  background: var(--sq-light); border: 0; color: var(--ink); text-align: left; font: inherit; cursor: default;
  display: flex; flex-direction: column;
}
/* dark squares: (row + col) even, for an 8-column board */
.sq:nth-child(16n+1), .sq:nth-child(16n+3), .sq:nth-child(16n+5), .sq:nth-child(16n+7),
.sq:nth-child(16n+10), .sq:nth-child(16n+12), .sq:nth-child(16n+14), .sq:nth-child(16n+16) { background: var(--sq-dark); }
.sq::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(120% 90% at 20% 0%, rgba(255,255,255,.035), transparent 60%);
}
.sq .coord { position: absolute; right: 8px; bottom: 6px; font: 500 10px/1 var(--mono); color: var(--faint); }
.sq.call { cursor: pointer; }
.sq.call:hover { outline: 1px solid var(--gold); outline-offset: -1px; z-index: 1; }
.sq.call:focus-visible { outline: 2px solid var(--gold-2); outline-offset: -2px; }
.sq .piece { width: 42%; max-width: 76px; aspect-ratio: 1; margin: -4px 0 0 -6px; }
.sq .mk { font: 600 clamp(13px, 1.25vw, 18px)/1 var(--display); letter-spacing: .06em; margin-top: auto; }
.sq .dir { font: 600 11px/1 var(--mono); margin-top: 6px; }
.sq .dir.long { color: var(--win); }
.sq .dir.short { color: var(--loss); }
.sq .meta { font: 400 10px/1.35 var(--mono); color: var(--muted); margin-top: 6px; }
.sq .badge {
  position: absolute; top: 9px; right: 9px; font: 600 9px/1 var(--body); letter-spacing: .14em; text-transform: uppercase;
  padding: 5px 7px; border: 1px solid var(--line-soft); border-radius: 999px; color: var(--muted); background: rgba(8,9,11,.6);
}
.badge.won { color: var(--win); border-color: rgba(119,175,150,.4); }
.badge.lost { color: var(--loss); border-color: rgba(202,119,112,.4); }
.badge.due { color: #16110a; background: var(--gold); border-color: var(--gold); }
.sq.market .mk { font-size: clamp(15px, 1.6vw, 22px); }
.sq.market .px { font: 500 clamp(12px, 1.1vw, 15px)/1.2 var(--mono); margin-top: 6px; }
.sq.market .lbl { font: 600 9px/1 var(--body); letter-spacing: .18em; text-transform: uppercase; color: var(--gold); }
.sq.ghost .ghost-piece { position: absolute; inset: 22% 22% 26%; opacity: .07; background: center/contain no-repeat; filter: grayscale(1); }
.sq .tag { position: absolute; top: 9px; left: 9px; font: 600 9px/1 var(--body); letter-spacing: .16em; text-transform: uppercase; color: var(--gold); background: rgba(8,9,11,.7); border: 1px solid var(--line); padding: 4px 6px; }
.preview-square .sq .piece { margin-top: 18px; }
.rules-more { margin-top: 22px; }
.board-foot { color: var(--muted); font-size: 13px; margin: 14px 4px 0; }

.sheet { position: fixed; inset: 0; z-index: 60; background: rgba(4,4,6,.72); backdrop-filter: blur(6px); display: grid; place-items: center; padding: 18px; }
.sheet[hidden] { display: none; }
.sheet-card { position: relative; width: min(560px, 100%); max-height: 90svh; overflow: auto; background: #0f1013; border: 1px solid var(--line); padding: 30px; }
.sheet-x { position: absolute; top: 10px; right: 12px; background: none; border: 0; color: var(--muted); font-size: 28px; cursor: pointer; }
.sheet h3 { font-size: 26px; display: flex; align-items: center; gap: 12px; }
.sheet h3 img { width: 54px; height: 54px; }
.sheet blockquote { margin: 18px 0; padding: 14px 18px; border-left: 2px solid var(--gold); background: rgba(201,164,92,.05); font-size: 17px; overflow-wrap: anywhere; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 8px 18px; font: 400 13px/1.4 var(--mono); margin: 0 0 18px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; overflow-wrap: anywhere; }

/* ---- rank 3: your move --------------------------------------------------------------- */
.move-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: clamp(24px, 4vw, 64px); align-items: start; }
.notation { min-width: 0; }
.say { font: 500 clamp(22px, 2.6vw, 34px)/1 var(--display); color: var(--gold-2); margin: 26px 0 12px; letter-spacing: .04em; }
.say:first-child { margin-top: 0; }
.seg { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border: 1px solid var(--line); }
.seg.two { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 10px; }
.seg.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.seg button {
  min-width: 0; padding: 14px 8px; background: var(--sq-dark); color: var(--muted); border: 0; border-right: 1px solid var(--line-soft);
  font: 600 13px/1.2 var(--body); letter-spacing: .08em; cursor: pointer; text-align: center;
}
.seg button:nth-child(even) { background: var(--sq-light); }
.seg button:last-child { border-right: 0; }
.seg button.on { color: #16110a; background: linear-gradient(180deg, var(--gold-2), var(--gold)); }
.seg button small { display: block; font: 400 11px/1.2 var(--mono); opacity: .8; margin-top: 4px; }
.stake { display: flex; align-items: center; border: 1px solid var(--line); background: var(--sq-dark); }
.stake input { flex: 1; min-width: 0; background: transparent; border: 0; color: var(--ink); font: 500 24px/1 var(--mono); padding: 16px 18px; outline: none; }
.stake .unit { padding: 0 18px; font: 600 13px/1 var(--body); letter-spacing: .14em; color: var(--gold); }
.stake:focus-within, .thesis:focus-within { border-color: var(--gold); }
.thesis { display: block; position: relative; border: 1px solid var(--line); background: var(--sq-dark); }
.thesis textarea { width: 100%; resize: vertical; min-height: 110px; background: transparent; border: 0; color: var(--ink); font: 400 16px/1.5 var(--body); padding: 16px 18px 30px; outline: none; }
.thesis .count { position: absolute; right: 12px; bottom: 8px; font: 400 11px/1 var(--mono); color: var(--faint); }
.preview { position: sticky; top: 90px; min-width: 0; }
.preview-square { width: min(300px, 100%); aspect-ratio: 1; margin-bottom: 24px; border: 1px solid var(--line); box-shadow: 0 30px 60px -30px #000; }
.preview-square .sq { width: 100%; height: 100%; background: var(--sq-dark); padding: 18px; }
.preview-square .sq .piece { width: 44%; max-width: none; }
.preview-square .sq .mk { font-size: 30px; }
.preview-square .sq .dir { font-size: 14px; }
.preview-square .sq .meta { font-size: 12px; }
.terms { margin: 0; display: grid; gap: 0; border-top: 1px solid var(--line-soft); }
.terms div { display: grid; grid-template-columns: 130px 1fr; gap: 14px; padding: 12px 0; border-bottom: 1px solid var(--line-soft); }
.terms dt { color: var(--muted); font-size: 13px; }
.terms dd { margin: 0; font: 500 14px/1.45 var(--mono); min-width: 0; overflow-wrap: anywhere; }
.terms dd.win { color: var(--win); font-family: var(--body); }
.terms dd.loss { color: var(--loss); font-family: var(--body); }

/* ---- rank 4: the ladder -------------------------------------------------------------- */
.ladder { background: radial-gradient(80% 60% at 70% 100%, rgba(201,164,92,.09), transparent 70%); }
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); align-items: end; gap: 0; }
.steps li { position: relative; display: flex; flex-direction: column; align-items: center; text-align: center; min-width: 0; }
.steps .plinth {
  width: 100%; border: 1px solid var(--line); border-bottom: 0;
  background: linear-gradient(180deg, #17181c, #0b0c0e);
  display: flex; flex-direction: column; align-items: center; justify-content: flex-start; padding: 16px 6px;
}
.steps li:nth-child(1) .plinth { height: 90px; }
.steps li:nth-child(2) .plinth { height: 130px; }
.steps li:nth-child(3) .plinth { height: 170px; }
.steps li:nth-child(4) .plinth { height: 210px; }
.steps li:nth-child(5) .plinth { height: 250px; }
.steps li:nth-child(6) .plinth { height: 290px; }
.steps li + li .plinth { border-left: 0; }
.steps img { width: min(150px, 100%); aspect-ratio: 1; margin-bottom: -6px; filter: drop-shadow(0 24px 30px rgba(0,0,0,.8)); }
.steps .nm { font: 600 clamp(14px, 1.5vw, 20px)/1 var(--display); letter-spacing: .08em; }
.steps .th { font: 500 12px/1.3 var(--mono); color: var(--muted); margin-top: 8px; }
.steps .sh { font: 600 10px/1 var(--body); letter-spacing: .16em; text-transform: uppercase; color: var(--gold); margin-top: 10px; }
.steps li.me .plinth { border-color: var(--gold); box-shadow: inset 0 0 40px rgba(201,164,92,.15); }
.you { margin-top: 22px; font: 500 15px/1.5 var(--mono); color: var(--gold-2); }

/* ---- rank 5: the court ------------------------------------------------------------- */
.court { border: 1px solid var(--line); }
.court table { width: 100%; border-collapse: collapse; font: 400 14px/1.3 var(--mono); }
.court th { text-align: left; font: 600 11px/1 var(--body); letter-spacing: .16em; text-transform: uppercase; color: var(--muted); padding: 14px 16px; border-bottom: 1px solid var(--line); }
.court td { padding: 12px 16px; border-bottom: 1px solid var(--line-soft); }
.court tr:nth-child(even) td { background: rgba(255,255,255,.015); }
.court td img { width: 34px; height: 34px; display: inline-block; vertical-align: middle; margin-right: 8px; }
.court .empty { padding: 44px 24px; text-align: center; color: var(--muted); }
.court .empty strong { display: block; font: 600 22px/1.2 var(--display); color: var(--ink); margin-bottom: 8px; }

/* ---- rank 6: the pot ------------------------------------------------------------------ */
.pot-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(0, 1.3fr); border: 1px solid var(--line); }
.pot-stat { padding: 26px; border-right: 1px solid var(--line-soft); min-width: 0; }
.pot-stat strong { display: block; font: 600 clamp(24px, 3vw, 38px)/1.1 var(--display); margin-top: 14px; overflow-wrap: anywhere; }
.pot-stat .unit { font: 600 12px/1 var(--body); letter-spacing: .14em; color: var(--gold); }
.pot-share { padding: 18px 26px; display: grid; gap: 4px; align-content: center; }
.pot-share p { display: flex; align-items: center; gap: 12px; margin: 0; font-family: var(--display); letter-spacing: .06em; }
.pot-share b { margin-left: auto; font: 500 13px/1 var(--mono); color: var(--gold-2); }
.claim[hidden] { display: none; }
.claim { margin-top: 18px; padding: 18px 22px; border: 1px solid var(--gold); display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }

/* ---- rank 7: the rules -------------------------------------------------------------- */
.moves { list-style: none; counter-reset: mv; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border: 1px solid var(--line); }
.moves li { counter-increment: mv; padding: 26px 22px 30px; min-width: 0; background: var(--sq-light); }
.moves li:nth-child(8n+1), .moves li:nth-child(8n+3), .moves li:nth-child(8n+6), .moves li:nth-child(8n+8) { background: var(--sq-dark); }
.moves li::before { content: counter(mv); display: block; font: 600 34px/1 var(--display); color: transparent; -webkit-text-stroke: 1px var(--gold); margin-bottom: 14px; }
.moves h3 { font-size: 20px; margin-bottom: 10px; }
.moves p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.6; }

/* ---- rank 8: promotion --------------------------------------------------------------- */
.promo { background: linear-gradient(0deg, rgba(201,164,92,.06), transparent 60%); }
.promo-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border: 1px solid var(--line); }
.promo-card { padding: 28px; border-right: 1px solid var(--line-soft); min-width: 0; }
.promo-card:last-child { border-right: 0; }
.promo-card .big { font: 600 44px/1 var(--display); letter-spacing: .08em; margin: 16px 0; color: var(--gold-2); }
.facts, .addr { list-style: none; margin: 16px 0 0; padding: 0; display: grid; gap: 8px; font-size: 14px; }
.facts li::before { content: "\2656  "; color: var(--gold); }
.addr li { display: grid; gap: 2px; font: 400 12px/1.4 var(--mono); }
.addr li span { color: var(--muted); font-family: var(--body); letter-spacing: .12em; text-transform: uppercase; font-size: 10px; }
.addr li a, .addr li em { overflow-wrap: anywhere; color: var(--ink); font-style: normal; }
.promo-card .btn { margin-top: 16px; }
.foot { display: flex; align-items: center; gap: 14px; margin-top: 60px; color: var(--faint); font-size: 12px; }
.foot img { border-radius: 50%; }

/* ---- responsive -------------------------------------------------------------------------- */
@media (max-width: 1180px) {
  .board { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .sq:nth-child(n) { background: var(--sq-light); }
  .sq:nth-child(8n+1), .sq:nth-child(8n+3), .sq:nth-child(8n+6), .sq:nth-child(8n+8) { background: var(--sq-dark); }
  .moves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .moves li:nth-child(n) { background: var(--sq-light); }
  .moves li:nth-child(4n+1), .moves li:nth-child(4n+4) { background: var(--sq-dark); }
  .pot-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .pot-share { grid-column: 1 / -1; border-top: 1px solid var(--line-soft); grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  :root { --rail: 0px; }
  .rail { display: none; }
  .rank { padding: 84px 16px; }
  .move-grid { grid-template-columns: minmax(0, 1fr); }
  .preview { position: static; }
  .tape-row { grid-template-columns: repeat(5, minmax(150px, 1fr)); overflow-x: auto; scroll-snap-type: x mandatory; }
  .tape-row li { scroll-snap-align: start; }
  .promo-grid { grid-template-columns: minmax(0, 1fr); }
  .promo-card { border-right: 0; border-bottom: 1px solid var(--line-soft); }
  .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 28px; }
  .steps li:nth-child(n) .plinth { height: auto; min-height: 90px; }
  .steps li:nth-child(4) .plinth { border-left: 1px solid var(--line); }
}
@media (max-width: 699px) {
  .arena-bg img { object-position: 50% 50%; }
  .arena-veil { background: linear-gradient(0deg, var(--bg) 0%, rgba(8,9,11,.55) 45%, rgba(8,9,11,.35) 100%); }
  .arena-inner { margin-bottom: 22px; padding: 0 16px; }
  .arena-mark { width: 56px; height: 56px; margin-bottom: 18px; }
  .tape { padding: 0 16px 24px; }
  .seat { top: 10px; right: 10px; }
  .seat-status { display: none; }
  .rank-no { font-size: 44px; min-width: 38px; }
  .filters { margin-left: 0; }
  .board { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sq:nth-child(n) { background: var(--sq-light); }
  .sq:nth-child(4n+1), .sq:nth-child(4n+4) { background: var(--sq-dark); }
  .sq .piece { width: 36%; }
  .sq.ghost:nth-child(n+13) { display: none; }
  .seg { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .seg button:nth-child(n) { border-bottom: 1px solid var(--line-soft); }
  .moves { grid-template-columns: minmax(0, 1fr); }
  .moves li:nth-child(n) { background: var(--sq-light); }
  .moves li:nth-child(odd) { background: var(--sq-dark); }
  .pot-grid { grid-template-columns: minmax(0, 1fr); }
  .pot-stat { border-right: 0; border-bottom: 1px solid var(--line-soft); }
  .pot-share { grid-template-columns: minmax(0, 1fr); }
  .terms div { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .court { overflow-x: auto; }
  .court table { min-width: 520px; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps li:nth-child(n) .plinth { border-left: 1px solid var(--line); }
  .steps li:nth-child(even) .plinth { border-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* the renders sit on near-black: lighten drops their square background into the page */
.sq .piece, .steps img, .pot-share img, .court td img, .sheet h3 img { mix-blend-mode: lighten; }

/* ---- the documentation page ------------------------------------------------------------ */
.docs-body { background: var(--bg); }
.docs-body main { padding-left: 0; }
.docs-top {
  position: sticky; top: 0; z-index: 40; display: flex; align-items: center; gap: 16px;
  padding: 14px clamp(16px, 4vw, 48px); border-bottom: 1px solid var(--line-soft);
  background: rgba(8,9,11,.86); backdrop-filter: blur(8px);
}
.docs-home { display: flex; align-items: center; gap: 12px; text-decoration: none; font: 600 18px/1 var(--display); letter-spacing: .1em; text-transform: uppercase; }
.docs-home img { border-radius: 50%; mix-blend-mode: lighten; }
.docs-state { margin-left: auto; font: 500 12px/1 var(--mono); color: var(--gold); }
.docs-shell { display: grid; grid-template-columns: 270px minmax(0, 1fr); gap: clamp(24px, 4vw, 64px); padding: clamp(28px, 5vw, 64px) clamp(16px, 4vw, 48px) 0; max-width: 1400px; margin: 0 auto; }
.toc { position: sticky; top: 92px; align-self: start; max-height: calc(100svh - 120px); overflow: auto; border-left: 1px solid var(--line-soft); padding-left: 18px; }
.toc ol { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 2px; }
.toc a { display: block; padding: 7px 10px; text-decoration: none; color: var(--muted); font-size: 13.5px; border-left: 2px solid transparent; }
.toc a:hover { color: var(--ink); }
.toc a.on { color: var(--gold-2); border-left-color: var(--gold); background: rgba(201,164,92,.06); }
main.docs { min-width: 0; padding-bottom: 90px; }
main.docs h1 { font-size: clamp(34px, 5vw, 60px); letter-spacing: .06em; }
.docs-lede { color: var(--muted); font-size: 17px; max-width: 68ch; margin: 16px 0 10px; }
main.docs section { padding: 34px 0; border-top: 1px solid var(--line-soft); scroll-margin-top: 90px; }
main.docs h2 { font-size: clamp(22px, 2.6vw, 30px); margin-bottom: 14px; }
main.docs h3 { font-size: 18px; margin: 22px 0 8px; color: var(--gold-2); }
main.docs p { max-width: 74ch; }
main.docs p, main.docs li { color: #cfcabf; }
main.docs b { color: var(--ink); }
.formula { font: 500 15px/1.6 var(--mono); color: var(--gold-2); background: rgba(201,164,92,.06); border-left: 2px solid var(--gold); padding: 12px 16px; overflow-x: auto; }
.note { font-size: 13.5px; color: var(--muted); border-left: 1px solid var(--line-soft); padding-left: 14px; }
.steps-list { counter-reset: st; list-style: none; padding: 0; display: grid; gap: 10px; }
.steps-list li { counter-increment: st; padding-left: 44px; position: relative; }
.steps-list li::before { content: counter(st); position: absolute; left: 0; top: -2px; width: 30px; height: 30px; display: grid; place-items: center; font: 600 15px/1 var(--display); color: var(--gold); border: 1px solid var(--line); }
.tbl { border: 1px solid var(--line); overflow-x: auto; margin: 16px 0; }
.tbl table { width: 100%; min-width: 520px; border-collapse: collapse; font-size: 14px; }
.tbl th { text-align: left; font: 600 11px/1 var(--body); letter-spacing: .16em; text-transform: uppercase; color: var(--muted); padding: 13px 14px; border-bottom: 1px solid var(--line); }
.tbl td { padding: 12px 14px; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
.tbl tr:last-child td { border-bottom: 0; }
.tbl tr:nth-child(even) td { background: rgba(255,255,255,.015); }
.tbl td:first-child { color: var(--ink); }
.tbl td img { display: inline-block; vertical-align: middle; margin-right: 8px; mix-blend-mode: lighten; }
.tbl .mono { font: 400 12px/1.5 var(--mono); color: var(--muted); overflow-wrap: anywhere; }
.tbl .win { color: var(--win); }
.tbl .loss { color: var(--loss); }
.limits { display: grid; gap: 12px; padding-left: 20px; max-width: 78ch; }
.faq { margin: 0; }
.faq dt { font: 600 16px/1.4 var(--body); color: var(--ink); margin-top: 20px; }
.faq dd { margin: 6px 0 0; color: var(--muted); max-width: 74ch; }
main.docs .addr { margin-top: 12px; }
main.docs .foot { margin-top: 50px; }
@media (max-width: 900px) {
  .docs-shell { grid-template-columns: minmax(0, 1fr); padding-top: 20px; }
  .toc { position: static; max-height: none; border-left: 0; border-bottom: 1px solid var(--line-soft); padding: 0 0 16px; }
  .toc ol { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .docs-home span { display: none; }
  .docs-state { font-size: 11px; }
}