:root{
  --sq-l:#F0DFC0; --sq-d:#B96A34; --piece:#2B2926; --piece-edge:#F8F5EF;
  --hl:#F7EC5E; --sel:#81B64C; --bad:#E4534A;
  --grain:repeating-linear-gradient(94deg,
    rgba(0,0,0,.05) 0 2px, rgba(255,255,255,.045) 2px 5px,
    rgba(0,0,0,.028) 5px 9px, rgba(255,255,255,.02) 9px 14px);
  --bg:#312E2B; --panel:#262421; --raised:#3A3835; --line:#403D39;
  --text:#FFFFFF; --muted:#A5A19B; --dim:#7D7975;
  --green:#81B64C; --green-hi:#9BCB63; --green-sh:#4C7A2B;
  --grey-btn:#3E3B37; --grey-sh:#26241F; --warn:#E4534A; --gold:#E3C84A;
}
@media (prefers-color-scheme: light){
  :root:not([data-theme="dark"]){
    --bg:#EDEBE9; --panel:#FFFFFF; --raised:#F4F2F0; --line:#DEDBD7;
    --text:#312E2B; --muted:#6B6763; --dim:#96918B;
    --green:#7FA650; --green-hi:#8FBA5C; --green-sh:#5B7A38;
    --grey-btn:#E8E5E2; --grey-sh:#C9C5C0; --warn:#B8392F; --gold:#8A6A0F;
  }
}
:root[data-theme="light"]{
  --bg:#EDEBE9; --panel:#FFFFFF; --raised:#F4F2F0; --line:#DEDBD7;
  --text:#312E2B; --muted:#6B6763; --dim:#96918B;
  --green:#7FA650; --green-hi:#8FBA5C; --green-sh:#5B7A38;
  --grey-btn:#E8E5E2; --grey-sh:#C9C5C0; --warn:#B8392F; --gold:#8A6A0F;
}
*{box-sizing:border-box}
/* The hidden attribute is only a UA default, so any author display rule (flex on
   .modalback, .authpage, .btn.upgrade, .sep...) silently beats it. Make it win. */
[hidden]{display:none !important}
body{margin:0;background:var(--bg);color:var(--text);font-family:Montserrat,system-ui,-apple-system,"Segoe UI",sans-serif;font-size:14px;line-height:1.5;-webkit-font-smoothing:antialiased}







.stats{display:flex;gap:8px}
.stat{background:var(--panel);border-radius:6px;padding:5px 12px;display:flex;flex-direction:column;align-items:center;min-width:62px}
.stat .k{font-size:9px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--dim)}
.stat .v{font-size:17px;font-weight:700;font-variant-numeric:tabular-nums;line-height:1.2}
.stat .v.hot{color:var(--green)}
.who{display:flex;align-items:center;gap:8px;background:var(--panel);border-radius:6px;padding:6px 10px}
.who .name{font-weight:700;font-size:13px}
.who .prov{font-size:9px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--dim)}


@media (max-width:900px){  }
.boardwrap{position:relative;width:100%;max-width:min(calc(100vh - 132px),720px);margin-inline:auto}

.board{container-type:inline-size;width:100%;aspect-ratio:1;display:grid;
  grid-template-columns:repeat(var(--n),minmax(0,1fr));
  grid-template-rows:repeat(var(--n),minmax(0,1fr));
  border-radius:4px;overflow:hidden;background:var(--sq-d);user-select:none}
.cell{position:relative;border:0;padding:0;margin:0;min-width:0;min-height:0;
  background-color:var(--sq-d);background-image:var(--grain);
  display:flex;align-items:center;justify-content:center;line-height:1;cursor:pointer;
  font-family:"Segoe UI Symbol","Apple Symbols","Noto Sans Symbols 2","DejaVu Sans",serif;
  --cell:calc(min(62vh,92vw) / var(--n)); --cell:calc(100cqw / var(--n));
  font-size:calc(var(--cell) * .93)}
.cell.lt{background-color:var(--sq-l)}
.board.locked .cell{cursor:default}
.cell:focus-visible{outline:3px solid var(--sel);outline-offset:-3px;z-index:4}
.board:not(.locked) .cell:hover{box-shadow:inset 0 0 0 3px rgba(255,255,255,.34)}
.coord{position:absolute;z-index:2;pointer-events:none;font-family:Montserrat,sans-serif;
  font-size:calc(var(--cell) * .155);font-weight:700;line-height:1}
.coord.r{top:5%;left:5%} .coord.f{bottom:4%;right:6%}
.cell.lt .coord{color:var(--sq-d)} .cell:not(.lt) .coord{color:var(--sq-l)}
.cell::after{content:"";position:absolute;inset:0;pointer-events:none;background:var(--ov,transparent);opacity:0}
.cell.sel::before{content:"";position:absolute;inset:0;pointer-events:none;z-index:3;box-shadow:inset 0 0 0 calc(var(--cell) * .055) var(--sel)}
.cell.flash{--ov:var(--hl)} .cell.flash::after{animation:bloom var(--fdur,1000ms) ease-out forwards;opacity:1}
@keyframes bloom{0%{opacity:.9}72%{opacity:.84}100%{opacity:0}}
.cell.bad{--ov:var(--bad)} .cell.bad::after{animation:pulse .5s ease-out forwards}
.cell.good{--ov:var(--sel)} .cell.good::after{animation:pulse .6s ease-out forwards}
@keyframes pulse{0%{opacity:0}22%{opacity:.8}62%{opacity:.8}100%{opacity:0}}
.glyph{color:var(--piece);-webkit-text-stroke:calc(var(--cell) * .026) var(--piece-edge);
  paint-order:stroke fill;filter:drop-shadow(0 calc(var(--cell) * .016) calc(var(--cell) * .012) rgba(0,0,0,.28));
  position:relative;z-index:1;display:block;
  font-size:calc(var(--cell) * var(--gs,.93));transform:translateY(var(--go,0em));
  transition:opacity .55s ease,filter .55s ease}
.glyph.gone{opacity:0;filter:blur(7px)}
@media (prefers-reduced-motion: reduce){
  @keyframes bloom{0%,84%{opacity:.9}100%{opacity:0}}
  .glyph{transition:opacity .18s linear} .glyph.gone{filter:none}
}
.timer{height:4px;border-radius:2px;background:transparent;overflow:hidden;margin-top:8px}
.timer i{display:block;height:100%;width:0;background:var(--gold);transition:width 0s linear}

.side{display:flex;flex-direction:column;gap:10px;min-width:0}
.card{background:var(--panel);border-radius:8px;padding:14px}
.phase{font-size:10px;font-weight:700;letter-spacing:.11em;text-transform:uppercase;color:var(--dim);margin-bottom:5px}
.msg{font-size:14px;font-weight:500;line-height:1.4}
.msg b{font-weight:700;color:var(--green)}
.status.err .phase,.status.err .msg b{color:var(--warn)}
.status.drift .phase,.status.drift .msg b{color:var(--gold)}
.statusfoot{display:flex;justify-content:space-between;gap:10px;margin-top:11px;padding-top:10px;
  border-top:1px solid var(--line);font-size:11px;font-weight:600;letter-spacing:.05em;
  text-transform:uppercase;color:var(--dim)}
.typed{font-weight:700;letter-spacing:.08em;color:var(--gold);min-height:16px}





.pane{display:none} .pane.on{display:block}

.movehead{font-size:10px;font-weight:700;letter-spacing:.11em;text-transform:uppercase;color:var(--dim);margin-bottom:8px}
.moves{max-height:190px;overflow-y:auto;display:flex;flex-direction:column}
.moves .row{display:flex;gap:8px;padding:4px 7px;border-radius:4px;font-size:13px;font-weight:600;font-variant-numeric:tabular-nums}
.moves .row:nth-child(odd){background:var(--raised)}
.moves .row .no{color:var(--dim);min-width:20px}
.moves .row.drift{color:var(--gold);font-weight:500}
.moves .empty{font-size:12.5px;font-weight:500;color:var(--dim);padding:2px}

.actions{display:flex;flex-direction:column;gap:8px}
.btn{font:inherit;font-weight:700;font-size:14px;border:0;border-radius:6px;padding:11px 14px;
  background:var(--grey-btn);color:var(--text);box-shadow:0 3px 0 var(--grey-sh);cursor:pointer;
  transition:background .12s ease,transform .06s ease,box-shadow .06s ease}
.btn:hover{background:color-mix(in srgb,var(--grey-btn) 82%,var(--text))}
.btn:active{transform:translateY(3px);box-shadow:0 0 0 var(--grey-sh)}
.btn:focus-visible{outline:3px solid var(--green);outline-offset:2px}
.btn.green{background:var(--green);color:#fff;box-shadow:0 3px 0 var(--green-sh)}
.btn.green:hover{background:var(--green-hi)}
.btn.green:active{box-shadow:0 0 0 var(--green-sh)}
.btn[disabled]{opacity:.45;cursor:not-allowed;transform:none;box-shadow:0 3px 0 var(--grey-sh)}
.btn.small{font-size:12px;padding:8px 10px;font-weight:600}
.btnrow{display:grid;grid-template-columns:1fr 1fr;gap:8px}

.field{display:flex;flex-direction:column;gap:4px;margin-bottom:11px}
.field label{display:flex;justify-content:space-between;font-size:10px;font-weight:700;
  letter-spacing:.09em;text-transform:uppercase;color:var(--dim)}
.field label span{color:var(--text);letter-spacing:.02em}
input[type=range]{width:100%;accent-color:var(--green);margin:0}
input[type=text],input[type=password],input[type=email]{
  font:inherit;font-size:13px;padding:9px 10px;border-radius:6px;border:1px solid var(--line);
  background:var(--raised);color:var(--text);width:100%}
input:focus-visible{outline:2px solid var(--green);outline-offset:0}
.tog{display:flex;gap:9px;align-items:flex-start;font-size:12.5px;color:var(--muted);cursor:pointer;margin-top:9px}
.tog input{accent-color:var(--green);margin:2px 0 0;flex:none}
.tog b{color:var(--text);font-weight:700}
.presets{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:14px}
.chip{font:inherit;font-size:12px;font-weight:700;border:0;border-radius:5px;padding:7px 8px;
  cursor:pointer;background:var(--raised);color:var(--muted)}
.chip[aria-pressed="true"]{background:var(--green);color:#fff}

table.rank{width:100%;border-collapse:collapse;font-size:12.5px}
table.rank th{font-size:9px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;
  color:var(--dim);text-align:left;padding:0 6px 6px}
table.rank td{padding:5px 6px;border-top:1px solid var(--line);font-variant-numeric:tabular-nums}
table.rank td.n{color:var(--dim);width:22px}
table.rank td.s{text-align:right;font-weight:700}
table.rank .me{background:var(--raised)}
.hint{font-size:12px;color:var(--dim);margin:8px 0 0}
.err{font-size:12.5px;color:var(--warn);font-weight:600;margin:0 0 9px}

.overlay{position:absolute;inset:0;z-index:10;display:none;align-items:center;justify-content:center;
  padding:14px;background:rgba(0,0,0,.45);border-radius:4px;backdrop-filter:blur(2px)}
.overlay.show{display:flex}
.modal{width:min(100%,340px);background:var(--panel);border-radius:10px;padding:20px;
  box-shadow:0 20px 50px -20px rgba(0,0,0,.7);display:flex;flex-direction:column;gap:13px;
  max-height:100%;overflow-y:auto}
.modal h2{margin:0;font-size:21px;font-weight:700;line-height:1.15;text-wrap:balance}
.modal h2.win{color:var(--green)}
.modal p{margin:0;font-size:13.5px;font-weight:500;color:var(--muted)}
.tally{display:flex;gap:8px}
.tally div{flex:1;background:var(--raised);border-radius:6px;padding:8px;text-align:center}
.tally .k{font-size:9px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--dim)}
.tally .v{font-size:18px;font-weight:700;font-variant-numeric:tabular-nums}
.sep{display:flex;align-items:center;gap:9px;color:var(--dim);font-size:10px;font-weight:700;
  letter-spacing:.09em;text-transform:uppercase}
.sep::before,.sep::after{content:"";flex:1;height:1px;background:var(--line)}
.rules{background:var(--panel);border-radius:8px;padding:16px 18px}
.rules h3{margin:0 0 10px;font-size:10px;font-weight:700;letter-spacing:.11em;text-transform:uppercase;color:var(--dim)}
.rules ol{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:9px;counter-reset:s}
.rules li{position:relative;display:block;padding-left:30px;font-size:13px;font-weight:500;color:var(--muted);max-width:70ch;line-height:1.6}
.rules li::before{counter-increment:s;content:counter(s);position:absolute;left:0;top:2px;width:19px;height:19px;border-radius:50%;background:var(--raised);color:var(--green);font-size:10px;font-weight:700;display:grid;place-items:center}
.rules b{color:var(--text);font-weight:700}
.rules .note{margin:11px 0 0;font-size:12px;color:var(--dim);max-width:70ch}
kbd{background:var(--raised);border-radius:3px;padding:1px 5px;font:inherit;font-size:11px;font-weight:700;color:var(--text)}





/* ── shell: fixed left rail, chess.com style ───────────────── */
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.shell{display:grid;grid-template-columns:224px minmax(0,1fr);min-height:100vh}

.rail{
  position:sticky;top:0;align-self:start;height:100vh;
  display:flex;flex-direction:column;gap:6px;
  background:var(--panel);padding:16px 12px;overflow-y:auto;
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);
  padding:4px 6px 14px}
.brand .mark{font-size:26px;line-height:1;color:var(--green);
  font-family:"Segoe UI Symbol","Apple Symbols",serif}
.brandtext{display:flex;flex-direction:column;min-width:0}
.brandtext b{font-size:15px;font-weight:700;letter-spacing:-.01em}
.brandtext i{font-style:normal;font-size:9.5px;font-weight:600;letter-spacing:.09em;
  text-transform:uppercase;color:var(--dim)}

.navlist{display:flex;flex-direction:column;gap:3px}
.nav{
  display:flex;align-items:center;gap:12px;width:100%;
  font:inherit;font-size:14px;font-weight:600;text-align:left;
  border:0;border-radius:7px;padding:11px 12px;cursor:pointer;
  background:transparent;color:var(--muted);transition:background .12s ease,color .12s ease;
}
.nav svg{width:20px;height:20px;flex:none;fill:currentColor;opacity:.8}
.nav:hover{background:var(--raised);color:var(--text)}
.nav.on{background:var(--raised);color:var(--text)}
.nav.on svg{fill:var(--green);opacity:1}
.nav:focus-visible{outline:2px solid var(--green);outline-offset:-2px}

.railfoot{margin-top:auto;display:flex;flex-direction:column;gap:9px;padding-top:14px}
.quota{font-size:11.5px;font-weight:600;color:var(--dim);line-height:1.45;background:var(--raised);border-radius:7px;padding:9px 11px}
.quota b{color:var(--text)}
.quota .pro{color:var(--green)}
.btn.upgrade{display:flex;align-items:center;justify-content:center;gap:7px;font-size:13px;padding:10px}
.btn.upgrade .ic{width:16px;height:16px;fill:currentColor}
.raillink{font-size:11px;color:var(--dim);text-decoration:none}
.raillink:hover{color:var(--muted);text-decoration:underline}

.stage{padding:16px 24px 44px;display:flex;flex-direction:column;gap:14px;max-width:1180px;width:100%;margin-inline:auto}
.stagehead{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}
.game{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:18px;align-items:start}
.boardcol{min-width:0}

/* segmented control inside the leaderboard card */
.seg{display:flex;gap:4px;background:var(--raised);border-radius:7px;padding:3px;margin-bottom:12px}
.segbtn{flex:1;font:inherit;font-size:12px;font-weight:700;border:0;border-radius:5px;
  padding:7px 4px;background:transparent;color:var(--muted);cursor:pointer}
.segbtn.on{background:var(--panel);color:var(--text)}
.segbtn:focus-visible{outline:2px solid var(--green);outline-offset:1px}

@media (max-width:1000px){
  .game{grid-template-columns:minmax(0,1fr)}
}
/* the rail becomes a bottom bar on small screens */
@media (max-width:760px){
  .shell{grid-template-columns:minmax(0,1fr)}
  .rail{
    position:fixed;bottom:0;left:0;right:0;top:auto;height:auto;z-index:20;
    flex-direction:row;align-items:center;gap:0;padding:6px 8px;
    border-top:1px solid var(--line);
  }
  .brand,.railfoot .raillink,.quota{display:none}
  .navlist{flex-direction:row;flex:1;gap:2px}
  .nav{flex-direction:column;gap:3px;font-size:10px;padding:7px 2px;justify-content:center;text-align:center}
  .nav svg{width:19px;height:19px}
  .railfoot{margin:0;padding:0;flex-direction:row}
  .btn.upgrade{padding:8px 10px;font-size:11px}
  .btn.upgrade span{display:none}
  /* extra bottom padding so the fixed nav bar never covers content */
  .stage{padding:14px 14px 92px}
}

/* ── login / signup pages ──────────────────────────────────── */
.authpage{min-height:100vh;display:flex;flex-direction:column;align-items:center;
  justify-content:center;gap:18px;padding:32px 20px}
.authbrand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--text)}
.authbrand .mark{font-size:30px;line-height:1;color:var(--green);
  font-family:"Segoe UI Symbol","Apple Symbols",serif}
.authcard{width:min(100%,392px);background:var(--panel);border-radius:10px;padding:26px 24px;
  box-shadow:0 20px 50px -26px rgba(0,0,0,.6)}
.authcard h1{margin:0 0 6px;font-size:22px;font-weight:700}
.authsub{margin:0 0 18px;font-size:13px;color:var(--muted);line-height:1.5}
.authcard .actions{gap:8px}
.btn.provider{display:block;text-align:center;text-decoration:none;line-height:1.3}
.authcard .sep{margin:16px 0}
.authcard form{margin-top:4px}
.hintlabel{font-weight:600;color:var(--dim);letter-spacing:.02em;text-transform:none}
.authnote{margin:14px 0 0;font-size:11.5px;color:var(--dim);line-height:1.5}
.authnote a{color:var(--muted)}
.authswap{margin:14px 0 0;font-size:13px;color:var(--muted);text-align:center}
.authswap a,.authfoot a{color:var(--green);text-decoration:none;font-weight:600}
.authswap a:hover,.authfoot a:hover{text-decoration:underline}
.authfoot{margin:0;font-size:12px;color:var(--dim)}
.authfoot a{color:var(--dim);font-weight:500}

/* signed-in / signed-out block in the rail */
.railwho{display:flex;flex-direction:column;gap:7px}
.railwho .acct{display:flex;align-items:center;gap:9px;width:100%;font:inherit;text-align:left;
  border:0;border-radius:7px;padding:9px 11px;background:var(--raised);color:var(--text);cursor:pointer}
.railwho .acct .nm{font-size:13px;font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.railwho .acct .pv{font-size:9px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--dim);margin-left:auto;flex:none}
.railwho .signin{display:block;text-align:center;text-decoration:none;font-size:13px;padding:10px}
.railwho .mk{display:block;text-align:center;font-size:11.5px;color:var(--dim);text-decoration:none}
.railwho .mk:hover{color:var(--muted);text-decoration:underline}

/* Mobile overrides for the rail account block. These must sit at the end of the
   file: media queries add no specificity, so the base .railwho rules above would
   otherwise win on source order. */
@media (max-width:760px){
  .railwho{flex-direction:row;align-items:center}
  .railwho .mk{display:none}
  .railwho .signin{padding:8px 12px;font-size:12px;white-space:nowrap}
  .railwho .acct{padding:7px 9px}
  .railwho .acct .pv{display:none}
}

/* Drift origin: the same highlight as the landing square but dimmer, so the
   direction of the move reads at a glance. */
.cell.flash.from::after{animation-name:bloomFrom}
@keyframes bloomFrom{0%{opacity:.5}72%{opacity:.45}100%{opacity:0}}

/* Language picker */
.langsel{font:inherit;font-size:12px;font-weight:600;padding:7px 9px;border-radius:6px;
  border:1px solid var(--line);background:var(--raised);color:var(--text);width:100%;cursor:pointer}
.langsel:focus-visible{outline:2px solid var(--green);outline-offset:1px}
.langsel:disabled{opacity:.5;cursor:not-allowed}
.langsel.langinline{width:auto;padding:4px 6px;vertical-align:middle}
.field label bdi{color:inherit;font-weight:inherit}
/* Keep last (media queries add no specificity): the mobile bottom bar has no
   room for a picker, and Settings carries one there. */
@media (max-width:760px){ .railfoot .langsel{display:none} }