:root{
  --bg:#0c0d12; --panel:#14161e; --ink:#e9e6df; --muted:#8b8f9c; --accent:#d9a441; --line:#262a36;
  --light:#e8d5b0; --dark:#a9774f; --sel:rgba(217,164,65,.55); --last:rgba(217,164,65,.32);
}
*{box-sizing:border-box}
/* --bs (board side) lives on body so it can follow --ebw (width taken by the eval bar, 0 when hidden) */
body{--ebw:34px;--bs:min(calc(100vw - 86px),76vh,640px);--bs:min(calc(100vw - 86px),76dvh,640px)}
body.no-eval{--ebw:0px}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.45 "Inter",system-ui,-apple-system,Segoe UI,sans-serif;min-height:100vh;overflow-x:hidden}
.backdrop{position:fixed;inset:0;background:
  radial-gradient(1000px 600px at 20% -10%,rgba(217,164,65,.14),transparent 60%),
  radial-gradient(900px 600px at 100% 110%,rgba(80,110,200,.16),transparent 60%);pointer-events:none}
.app{position:relative;display:grid;grid-template-columns:minmax(0,1fr);gap:20px;max-width:1700px;margin:0 auto;padding:24px 16px;align-items:start}
.stage{display:flex;flex-direction:column;align-items:center;gap:10px}
.player{width:calc(var(--bs) + var(--ebw));display:flex;align-items:center;gap:10px}
.player small{display:block;color:var(--muted);font-size:12px;min-height:14px;letter-spacing:.04em}
.avatar{width:38px;height:38px;border-radius:10px;background:var(--panel);border:1px solid var(--line);display:grid;place-items:center;font-size:24px}
.status{margin-left:auto;color:var(--accent);font-size:13px}
.board-wrap{display:flex;gap:10px;align-items:stretch}
.evalbar{position:relative;width:24px;border-radius:8px;overflow:hidden;background:#15161c;border:1px solid var(--line);height:var(--bs)}
.evalfill{position:absolute;left:0;right:0;bottom:0;height:50%;background:linear-gradient(#f4efe4,#cfc7b4);transition:height .8s cubic-bezier(.2,.8,.2,1)}
.evalbar span{position:absolute;left:0;right:0;top:50%;transform:translateY(-50%);font-size:9px;text-align:center;mix-blend-mode:difference;color:#fff}
.board-perspective{position:relative;perspective:1400px}
.board{position:relative;width:var(--bs);height:var(--bs);display:grid;grid-template-columns:repeat(8,minmax(0,1fr));grid-template-rows:repeat(8,minmax(0,1fr));border-radius:6px;overflow:hidden;
  box-shadow:0 0 0 8px #2a1e14,0 0 0 9px #0006,0 30px 60px -10px #000c,0 0 80px rgba(217,164,65,.08);
  transition:transform .8s cubic-bezier(.2,.8,.2,1);transform-style:preserve-3d;user-select:none;touch-action:none}
.tilt .board{transform:rotateX(34deg) translateY(-2%) scale(.94)}
.sq{position:relative;display:block;min-width:0;min-height:0;overflow:hidden;cursor:pointer}
.sq.l{background:linear-gradient(135deg,#efdcb8,#e0c99d)} .sq.d{background:linear-gradient(135deg,#b3825a,#9a6a44)}
.sq.last::before,.sq.sel::before{content:"";position:absolute;inset:0;background:var(--last)}
.sq.sel::before{background:var(--sel)}
.sq.check::after{content:"";position:absolute;inset:0;background:radial-gradient(circle,rgba(230,50,50,.85),rgba(230,50,50,0) 70%)}
.sq .dot{position:absolute;width:30%;height:30%;border-radius:50%;background:rgba(20,20,20,.28);pointer-events:none}
.sq .ring{position:absolute;inset:6%;border-radius:50%;border:5px solid rgba(20,20,20,.28);pointer-events:none}
.sq .coord{position:absolute;font-size:10px;font-weight:600;opacity:.6;pointer-events:none}
.sq .coord.r{top:3px;left:4px}.sq .coord.f{bottom:2px;right:4px}
.sq.l .coord{color:#9a6a44}.sq.d .coord{color:#efdcb8}
.piece{position:absolute;inset:0;display:grid;place-items:center;z-index:2;font-size:calc(var(--bs)/8*.82);line-height:1;pointer-events:none;
  font-family:"Segoe UI Symbol","Noto Sans Symbols 2","Apple Symbols","DejaVu Sans",serif;transition:transform .12s}
.piece.w{color:#fbf6ea;-webkit-text-stroke:1.3px #3a2a1a;text-shadow:0 3px 3px #0005}
.piece.b{color:#1a1a20;-webkit-text-stroke:1px #000;text-shadow:0 3px 3px #0006,0 0 1px #fff8}
.piece.drag{position:fixed;inset:auto;display:block;z-index:50;pointer-events:none;transform:translate(-50%,-50%) scale(1.15);filter:drop-shadow(0 12px 10px #0008);transition:none}
.sq.hide .piece{opacity:.25}
.promo{position:absolute;inset:0;display:grid;place-items:center;background:#000a;z-index:20;border-radius:6px}
.promo div{display:flex;gap:10px;background:var(--panel);padding:14px;border-radius:14px;border:1px solid var(--line)}
.promo button{font-size:44px;width:74px;height:74px;border-radius:12px;border:1px solid var(--line);background:#1c1f2a;cursor:pointer;color:#fbf6ea}
.promo button:hover{background:#2a2f40}
.thinking{position:absolute;left:50%;top:-14px;transform:translateX(-50%);display:flex;gap:6px;align-items:center;background:var(--panel);border:1px solid var(--line);
  padding:6px 14px;border-radius:99px;z-index:10;font-size:12px;color:var(--muted)}
.thinking span{width:6px;height:6px;border-radius:50%;background:var(--accent);animation:b 1s infinite}
.thinking span:nth-child(2){animation-delay:.15s}.thinking span:nth-child(3){animation-delay:.3s}
@keyframes b{0%,80%,100%{transform:scale(.5);opacity:.4}40%{transform:scale(1);opacity:1}}
.modal{position:absolute;inset:0;display:grid;place-items:center;background:#000b;z-index:30;border-radius:6px;backdrop-filter:blur(3px)}
.card{background:var(--panel);border:1px solid var(--line);padding:26px 34px;border-radius:18px;text-align:center;box-shadow:0 20px 60px #000}
.card h2{margin:0 0 6px;font-size:26px}.card p{margin:0 0 16px;color:var(--muted)}
.side,.think{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:16px;display:flex;flex-direction:column;gap:10px;min-height:0}
.brand{display:flex;align-items:baseline;justify-content:space-between}.brand h1{margin:0;font-size:26px;letter-spacing:.01em}
.about{font-size:12.5px;color:var(--accent);text-decoration:none;border-bottom:1px dotted var(--accent)}
.side .tag{margin:-6px 0 2px;color:var(--muted);font-size:12.5px}
.side h3,.think h3{margin:6px 0 0;font-size:12px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-weight:600}.side h3 small,.think h3 small{text-transform:none;letter-spacing:0;margin-left:6px}
.row{display:flex;gap:10px;flex-wrap:wrap}.row label{flex:1;font-size:12px;color:var(--muted);display:flex;flex-direction:column;gap:4px;min-width:120px}
select{background:#1c1f2a;color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:8px;font:inherit}
.btns{gap:8px}.btn{background:#1c1f2a;color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:8px 12px;font:inherit;cursor:pointer;transition:.15s}
.btn:hover{border-color:var(--accent)}.btn.primary{background:var(--accent);color:#1b1305;border-color:var(--accent);font-weight:700}.btn.on{border-color:var(--accent);color:var(--accent)}
.moves{margin:0;padding:0;list-style:none;display:grid;grid-template-columns:34px 1fr 1fr;gap:2px 6px;max-height:190px;overflow:auto;font-variant-numeric:tabular-nums;font-size:14px}
.moves .n{color:var(--muted)}.moves .m{padding:1px 6px;border-radius:6px}.moves .m.cur{background:#262a36}
.thoughts{display:flex;flex-direction:column;gap:8px}.muted{color:var(--muted);margin:0;font-size:13px}
.cand{border:1px solid var(--line);border-radius:12px;padding:8px 10px;background:#181b25}
.cand.pick{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent) inset}
.cand .h{display:flex;justify-content:space-between;font-weight:600}.cand .h span{color:var(--muted);font-weight:500;font-size:12px}
.cand .ln{color:var(--muted);font-size:12.5px;margin-top:2px;word-break:break-word}
.cand .bar{height:4px;border-radius:3px;background:#2a2e3b;margin-top:6px;overflow:hidden}.cand .bar i{display:block;height:100%;background:linear-gradient(90deg,#d9a441,#f1d28a)}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:#2a1618;border:1px solid #6d2a30;padding:10px 16px;border-radius:12px;z-index:99}
[hidden]{display:none!important}
body.no-eval .evalbar{display:none}body.no-eval .board-wrap{gap:0}

.sliders label b{color:var(--ink);font-weight:600;margin-left:6px}
input[type=range]{width:100%;accent-color:var(--accent,#7aa2ff)}

.cfg{border:1px solid var(--line);border-radius:14px;padding:10px 12px;background:#171a23;display:flex;flex-direction:column;gap:10px}
.cfgh{font-size:12px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-weight:600}.cfgh small{text-transform:none;letter-spacing:0;margin-left:6px;color:var(--accent)}
.cfg label{display:flex;flex-direction:column;gap:3px;font-size:13px;color:var(--ink)}
.cfg label span{display:flex;justify-content:space-between}.cfg label b{color:var(--accent)}
.cfg em{font-style:normal;font-size:11.5px;color:var(--muted);line-height:1.35}
.thinkmeta{display:flex;flex-wrap:wrap;gap:6px}.thinkmeta span{font-size:11.5px;color:var(--muted);background:#1b1e29;border:1px solid var(--line);border-radius:99px;padding:2px 9px}
.thinkmeta b{color:var(--ink)}
.cand .h b{font-weight:600}.cand .tag{font-style:normal;font-size:10.5px;color:#14161e;background:var(--accent);border-radius:99px;padding:1px 8px;margin-left:8px;align-self:center;margin-right:auto}
.cand .ln{display:flex;flex-wrap:wrap;gap:3px 5px;align-items:baseline;margin:6px 0 2px}
.cand .ln .n{font-style:normal;color:#6f7484;font-size:11.5px;margin-right:-2px}
.cand .mv{font-size:13px;padding:0 4px;border-radius:5px;color:var(--muted)}
.cand .mv.first{color:#14161e;background:var(--accent);font-weight:600}.cand .mv.me{color:var(--ink)}.cand .mv.opp{color:#9aa0b0}
.meters{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:6px}.meters label{font-size:11px;color:var(--muted)}
.meters .bar{margin-top:3px}.cand .bar i.p{background:linear-gradient(90deg,#5b7bd6,#9db4f0)}

.modelbox{border:1px solid var(--line);border-radius:14px;padding:10px 12px;background:#171a23;display:flex;flex-direction:column;gap:6px}
.modelbox label{display:flex;flex-direction:column;gap:4px;font-size:12px;color:var(--muted)}
.mdesc{font-size:12.5px;color:var(--ink);line-height:1.4}.mbadge{font-size:11.5px;color:var(--accent)}

.cand .bl{display:flex;align-items:baseline;gap:8px;border-radius:8px;padding:2px 6px;margin:2px -6px}
.cand .bl .ln{margin:2px 0;flex:1;min-width:0}.cand .bl .bs{font-size:11.5px;color:var(--muted);flex:none}
.cand .bl.crit{background:rgba(217,164,65,.12);box-shadow:inset 2px 0 0 var(--accent)}.cand .bl.crit .bs{color:var(--accent)}
.cand .bnote{font-size:11px;color:var(--muted);margin-top:2px}

/* ---- three columns on wide screens: controls | board | what it is thinking (all inside one screen) ---- */
@media (min-width:1100px){
  body{--bs:min(76vh,calc(100vw - 790px),640px);--bs:min(76dvh,calc(100vw - 790px),640px);height:100vh;overflow:hidden}
  body.no-eval{--bs:min(76vh,calc(100vw - 756px),640px);--bs:min(76dvh,calc(100vw - 756px),640px)}
  .app{grid-template-columns:290px auto minmax(340px,1fr);height:100vh;align-items:stretch;padding:16px}
  .side,.think{height:calc(100vh - 32px);overflow:auto}
  .stage{justify-content:center}
  .think .thoughts{flex:1;min-height:0;overflow:auto}
  .moves{max-height:none;flex:1;min-height:60px}
}
.cost{font-size:11.5px;color:var(--muted)}
.btn:disabled{opacity:.4;cursor:default}.btn:disabled:hover{border-color:var(--line)}
.btns .btn{padding:7px 10px}

/* ---- compact candidate cards ---- */
.thoughts{gap:6px}
.cand{cursor:pointer;padding:7px 10px}
.cand:hover{border-color:#3a4052}.cand.pick{border-color:var(--accent)}
.cand.open{background:#1d2130}
.cand .h{align-items:center;gap:8px;justify-content:flex-start}
.cand .rk{font-style:normal;font-size:11px;color:var(--muted);width:16px}
.cand .h .pc{margin-left:auto;color:var(--ink);font-size:12.5px;font-weight:600}
.cand .tag{margin:0}
.cand .mini{height:4px;border-radius:3px;background:#2a2e3b;overflow:hidden;flex:0 0 70px}.cand .mini i{display:block;height:100%;background:linear-gradient(90deg,#d9a441,#f1d28a)}
.cand .ln{margin:3px 0 0}
.cand:not(.open) .ln{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.thoughts.dense .cand:not(.open) .ln{-webkit-line-clamp:1}
.thoughts.dense .cand{padding:4px 9px}.thoughts.dense .cand .mv{font-size:12px}
.cand .more{font-size:11px;color:var(--muted);margin-left:6px}
.cand .prior{font-size:11px;color:#9db4f0}
.cand .bl.crit{margin-top:2px}
.cand .bnote{margin:4px 0 2px}
.moves{align-content:start}
.tog{display:flex;gap:8px;align-items:flex-start;font-size:12.5px;cursor:pointer}.tog input{margin-top:2px}.tog span{line-height:1.3}
[hidden]{display:none!important}
.modesel{display:block;margin-bottom:10px}
.cand.calc .mini i{width:100%;background:linear-gradient(90deg,transparent,var(--accent),transparent);background-size:200% 100%;animation:calc 1.1s linear infinite;opacity:.5}@keyframes calc{from{background-position:200% 0}to{background-position:-200% 0}}

/* ---- settings fold-out (always open on wide screens, collapsible on phones) ---- */
.settings{display:block}.settings>summary{display:none;cursor:pointer;font-weight:600;padding:2px 0;list-style:none}
.settings>summary::-webkit-details-marker{display:none}
.settings>summary::after{content:"▾";float:right;color:var(--muted)}.settings:not([open])>summary::after{content:"▸"}
.settings>summary small{color:var(--accent);font-weight:500;margin-left:6px}
.sbody{display:flex;flex-direction:column;gap:10px}
.movesbox{display:flex;flex-direction:column;gap:8px;min-height:0}
.movesbox h3{margin:6px 0 0}
@media (min-width:1100px){.movesbox{flex:1}}

/* ---- tablets and phones: one column, board first ---- */
@media (max-width:1099px){
  body{--ebw:24px}
  body.no-eval{--ebw:0px}
  body{--bs:min(calc(100vw - 32px - var(--ebw)),76vh,640px);--bs:min(calc(100vw - 32px - var(--ebw)),76dvh,640px)}
  .evalbar{width:14px}
  .app{gap:12px;padding:12px 10px calc(16px + env(safe-area-inset-bottom))}
  .side{display:contents}
  .brand{order:1;padding:0 4px}.side .tag{order:2;margin:-8px 0 0;padding:0 4px}
  .stage{order:3}#actions{order:4}.settings{order:5}#thinkPanel,#reviewPanel{order:6}.movesbox{order:7}
  .settings,.movesbox,.think{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:12px}
  .settings>summary{display:block}
  .settings:not([open]) .sbody{display:none}
  .settings[open]>summary{margin-bottom:10px}
  .board{box-shadow:0 0 0 4px #2a1e14,0 0 0 5px #0006,0 18px 36px -10px #000c}
  .moves{max-height:150px}
  #actions{display:grid;grid-template-columns:repeat(auto-fit,minmax(88px,1fr));gap:8px}
  #actions .btn{padding:9px 6px;min-height:42px;text-align:center}
  #actions #newBtn{grid-column:1/-1}
}
@media (max-width:520px){
  .app{padding-left:8px;padding-right:8px}
  .avatar{width:32px;height:32px;font-size:20px;border-radius:8px}
  .player b{font-size:14px}
  .card{padding:18px 16px;margin:0 12px}.card h2{font-size:22px}
  .coord{font-size:8.5px!important}
  .promo button{width:58px;height:58px;font-size:36px}
  .thinking{top:-12px}
}
@media (pointer:coarse){
  select,textarea,input[type=text]{font-size:16px}
  .btn{min-height:42px}
  input[type=range]{height:28px}
}
@media (max-height:520px) and (orientation:landscape){
  body{--bs:min(calc(100vw - 32px - var(--ebw)),calc(100vh - 110px),640px)}
}

/* ---- game-over card and PGN dialog ---- */
.mbtns{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.dlg{position:fixed;inset:0;z-index:80;display:grid;place-items:center;background:#000b;backdrop-filter:blur(3px);padding:12px}
.dlgcard{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:18px;width:min(560px,100%);display:flex;flex-direction:column;gap:12px;max-height:calc(100dvh - 24px);overflow:auto}
.dlgcard h2{margin:0;font-size:20px}
.dlgcard textarea{width:100%;background:#0f1118;color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:10px;font:12.5px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;resize:vertical}
.small{font-size:12px}

/* ---- review: board arrows, move list marks, graph, stats ---- */
.board-perspective{position:relative}
.arrows{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:4}
.tilt .arrows{display:none}
.arrows line{stroke:rgba(110,190,130,.85);stroke-width:.17;stroke-linecap:round}
.arrows polygon{fill:rgba(110,190,130,.9)}
.revnav{display:flex;align-items:center;justify-content:center;gap:10px;width:calc(var(--bs) + var(--ebw))}
.revnav .btn{flex:1;max-width:84px;min-height:42px}.revnav span{min-width:74px;text-align:center;color:var(--muted);font-size:13px}
.review .player small{min-height:0}
.moves .m[data-ply]{cursor:pointer}.moves .m[data-ply]:hover{background:#1d2130}
.moves .m b{margin-left:3px;font-size:11px}
.moves .m[data-q=inaccuracy] b{color:#e6c15a}.moves .m[data-q=mistake] b{color:#e8924f}.moves .m[data-q=blunder] b{color:#e5604f}
.revprog{height:4px;border-radius:3px;background:#2a2e3b;overflow:hidden}.revprog i{display:block;height:100%;width:0;background:var(--accent);transition:width .2s}
.revprog.done{display:none}
.graph{width:100%;height:auto;border:1px solid var(--line);border-radius:10px;background:#12141b;cursor:pointer;touch-action:manipulation}
.graph .mid{stroke:#303546;stroke-width:1;vector-effect:non-scaling-stroke}
.graph .area{fill:rgba(240,232,214,.22)}
.graph .ln{fill:none;stroke:#e9dcc0;stroke-width:1.6;vector-effect:non-scaling-stroke}
.graph .cur{stroke:var(--accent);stroke-width:1.6;vector-effect:non-scaling-stroke}
.graph .dotq{stroke:#12141b;stroke-width:1;vector-effect:non-scaling-stroke}
.revstats{display:flex;gap:8px;flex-wrap:wrap}
.revstats div{flex:1;min-width:140px;background:#171a23;border:1px solid var(--line);border-radius:12px;padding:8px 10px;font-size:12.5px;color:var(--muted)}
.revstats b{display:block;color:var(--ink);font-size:20px;line-height:1.2}
.revnow{background:#171a23;border:1px solid var(--line);border-radius:12px;padding:10px 12px;font-size:13.5px;min-height:64px}
.revnow .q{font-weight:700}.q.best,.q.excellent,.q.good{color:#8fd19e}.q.inaccuracy{color:#e6c15a}.q.mistake{color:#e8924f}.q.blunder{color:#e5604f}
.revnow .sub{color:var(--muted);font-size:12.5px;margin-top:4px}
.revask{display:flex;flex-direction:column;gap:8px}.revout{font-size:13px;color:var(--ink);min-height:18px}