:root{--bg:#262421;--panel:#312e2b;--panel2:#3a3734;--panel3:#211f1d;--text:#f0f0ee;--muted:#aaa7a2;--accent:#81b64c;--accent2:#6e9f3f;--board-light:#f0d9b5;--board-dark:#b58863;--gold:#f6c453;--danger:#d54b4b;--shadow:0 18px 50px rgba(0,0,0,.35);--radius:16px}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:radial-gradient(circle at top,#3a3631 0,#262421 36%,#1f1d1b 100%);color:var(--text);font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;-webkit-tap-highlight-color:transparent}body{touch-action:manipulation}.app-shell{max-width:1500px;margin:0 auto;padding:14px clamp(8px,2vw,24px) 28px}.topbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}.brand{display:flex;align-items:center;gap:10px}.brand-mark{width:44px;height:44px;border-radius:13px;display:grid;place-items:center;background:linear-gradient(145deg,#3d3935,#211f1d);box-shadow:inset 0 1px rgba(255,255,255,.08),0 8px 24px rgba(0,0,0,.3);font-size:25px}.brand-name{font-weight:850;letter-spacing:.2px}.brand-subtitle{font-size:12px;color:var(--muted);margin-top:2px}.topbar-actions{display:flex;align-items:center;gap:8px}.engine-mode-control{display:flex;align-items:center;gap:8px;background:#201f1d;border:1px solid rgba(255,255,255,.06);padding:6px 8px;border-radius:12px}.engine-mode-control span{font-size:10px;font-weight:800;letter-spacing:.7px;color:#bdb8b0}.engine-mode-control select{background:#3b3936;color:var(--text);border:0;border-radius:8px;padding:7px 22px 7px 8px;font-weight:800}.icon-btn,.toolbar-btn,.tab,.ghost-btn,.primary-btn,.small-btn,.overlay-stop,.piece-tool{appearance:none;border:0;color:var(--text);cursor:pointer}.icon-btn{width:40px;height:40px;border-radius:12px;background:#34312e;font-size:19px;box-shadow:inset 0 1px rgba(255,255,255,.05)}.icon-btn:active,.toolbar-btn:active,.ghost-btn:active,.primary-btn:active,.small-btn:active{transform:translateY(1px)}
.layout{display:grid;grid-template-columns:minmax(0,980px) 390px;gap:16px;align-items:start}.board-column{min-width:0}.player-card,.engine-card,.side-panel,.hint-strip{background:linear-gradient(145deg,rgba(57,54,51,.98),rgba(45,42,40,.98));border:1px solid rgba(255,255,255,.06);border-radius:var(--radius);box-shadow:var(--shadow)}.player-card{display:flex;align-items:center;gap:11px;padding:10px 12px;margin-bottom:10px}.player-avatar{width:38px;height:38px;display:grid;place-items:center;border-radius:12px;background:#23211f;font-weight:900}.player-avatar.engine-avatar,.helper-card .player-avatar{background:linear-gradient(145deg,#3d6130,#20281d)}.player-meta{display:flex;flex-direction:column;gap:2px;min-width:0}.player-meta strong{font-size:13px}.player-meta span{font-size:11px;color:var(--muted)}.turn-dot{margin-left:auto;width:9px;height:9px;border-radius:999px;background:#56514b;box-shadow:0 0 0 4px rgba(86,81,75,.12)}.turn-dot.active{background:var(--accent);box-shadow:0 0 0 4px rgba(129,182,76,.13)}
.board-wrap{position:relative;aspect-ratio:1/1;max-width:980px;margin:auto;border-radius:10px;overflow:hidden;box-shadow:0 16px 44px rgba(0,0,0,.42),0 0 0 1px rgba(0,0,0,.2)}.board{display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);width:100%;height:100%;user-select:none}.square{position:relative;display:grid;place-items:center}.square.light{background:var(--board-light)}.square.dark{background:var(--board-dark)}.square:before{content:"";position:absolute;inset:0;opacity:0;transition:opacity .1s}.square.last-move:before{background:rgba(246,196,83,.55);opacity:1}.square.selected:before{background:rgba(246,220,90,.7);opacity:1}.square.engine-best:before{background:rgba(129,182,76,.62);opacity:1}.square.legal:after,.square.capture:after{content:"";position:absolute;border-radius:50%;z-index:1}.square.legal:after{width:22%;height:22%;background:rgba(24,22,19,.24)}.square.capture:after{inset:7%;border:5px solid rgba(129,182,76,.72)}.piece{position:relative;z-index:2;width:92%;height:92%;object-fit:contain;filter:drop-shadow(0 2px 1px rgba(0,0,0,.28));transition:transform .12s ease,filter .12s ease}.square:active .piece{transform:scale(.94)}.coord{position:absolute;z-index:3;font-size:10px;font-weight:800;line-height:1;pointer-events:none;opacity:.85}.coord.rank{top:4px;left:5px}.coord.file{right:5px;bottom:4px}.light .coord{color:var(--board-dark)}.dark .coord{color:var(--board-light)}
.board-overlay{position:absolute;inset:0;background:rgba(18,17,16,.48);backdrop-filter:blur(2px);display:grid;place-items:center;z-index:20}.board-overlay.hidden,.promotion-modal.hidden{display:none}.overlay-card{min-width:min(300px,80%);padding:20px;border-radius:18px;background:rgba(43,40,38,.96);border:1px solid rgba(255,255,255,.09);display:flex;flex-direction:column;align-items:center;gap:8px;box-shadow:0 24px 50px rgba(0,0,0,.35)}.overlay-card strong{font-size:17px}.overlay-card span{font-size:12px;color:var(--muted)}.spinner{width:28px;height:28px;border:3px solid rgba(255,255,255,.14);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.overlay-stop{margin-top:4px;border-radius:10px;background:#49443f;padding:8px 14px;font-weight:800}
.engine-card{padding:12px;margin-top:10px}.engine-card-top{display:flex;align-items:center;gap:10px}.eval-badge{margin-left:auto;min-width:68px;text-align:center;padding:8px 10px;border-radius:10px;background:#211f1d;font-weight:850;color:#dfe7d9}.bestmove-box{margin-top:10px;background:#211f1d;border-radius:13px;padding:11px}.bestmove-heading{display:flex;justify-content:space-between;color:#9e9991;font-size:10px;font-weight:900;letter-spacing:1px}.bestmove-heading #bestMoveUci{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:#d8d3cd}.bestmove-san{font-size:22px;font-weight:900;margin-top:3px;letter-spacing:.2px}.pv-line{margin-top:9px;padding:9px 11px;background:#292724;border-radius:10px;color:#d1cdc7;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;min-height:37px;overflow:auto}.board-toolbar{display:flex;gap:8px;justify-content:center;margin-top:10px}.toolbar-btn{background:#373431;border:1px solid rgba(255,255,255,.05);padding:10px 14px;border-radius:11px;font-weight:800}.hint-strip{display:flex;justify-content:space-between;gap:14px;padding:10px 12px;margin-top:10px;color:#a8a39d;font-size:11px}
.side-panel{overflow:hidden}.tabs{display:flex;background:#252320;padding:6px;border-bottom:1px solid rgba(255,255,255,.06)}.tab{flex:1;background:transparent;padding:10px;border-radius:10px;font-weight:850;color:#9f9a93}.tab.active{background:#3b3834;color:#fff;box-shadow:inset 0 1px rgba(255,255,255,.05)}.panel{display:none;padding:15px}.panel.active-panel{display:block}.panel-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;margin-bottom:13px}.panel h2{margin:0;font-size:18px}.panel-heading p{margin:3px 0 0;color:var(--muted);font-size:11px}.status-pill{display:flex;align-items:center;gap:6px;background:#252320;border-radius:999px;padding:7px 9px;font-size:10px;font-weight:800;color:#aaa}.status-pill span{width:7px;height:7px;border-radius:50%;background:var(--accent)}.moves-list{min-height:250px;max-height:55vh;overflow:auto;border-radius:12px;background:#252320;padding:6px}.move-row{display:grid;grid-template-columns:34px 1fr 1fr;align-items:center;border-radius:8px;min-height:34px}.move-row:nth-child(odd){background:rgba(255,255,255,.018)}.move-no{font-size:11px;color:#807b74;text-align:center}.move-cell{padding:7px 8px;font-weight:800;font-size:13px;border-radius:7px}.move-cell.active{background:rgba(129,182,76,.22);color:#eaf6df}.fen-row{display:flex;gap:8px;margin-top:10px}.fen-row input{min-width:0;flex:1;background:#211f1d;border:1px solid rgba(255,255,255,.07);color:#ddd8d1;border-radius:10px;padding:10px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px}.small-btn{background:#4a4641;border-radius:10px;padding:0 12px;font-weight:900}.quick-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:8px}.ghost-btn,.primary-btn{padding:10px 13px;border-radius:10px;font-weight:900}.ghost-btn{background:#3b3835;border:1px solid rgba(255,255,255,.06)}.primary-btn{background:linear-gradient(180deg,var(--accent),var(--accent2));color:#15200f;box-shadow:0 6px 18px rgba(129,182,76,.18)}.wide{width:100%}.field{display:block;margin:12px 0}.field>span{display:flex;justify-content:space-between;gap:8px;font-size:12px;color:#c4c0ba;font-weight:800;margin-bottom:7px}.field select,.field input[type=number]{width:100%;background:#211f1d;color:var(--text);border:1px solid rgba(255,255,255,.07);border-radius:10px;padding:10px}.range-row{display:flex;align-items:center;gap:10px}.range-row input{flex:1}.range-row output{min-width:56px;text-align:right;font-weight:900;font-size:12px}.switch-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 0;color:#c5c0b9;font-size:12px;font-weight:800}.switch-row input{width:18px;height:18px;accent-color:var(--accent)}.engine-actions,.setup-row,.drawer-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}.engine-actions .primary-btn{width:100%}.engine-console{margin-top:12px;white-space:pre-wrap;max-height:190px;overflow:auto;background:#171614;color:#aaa69e;border:1px solid rgba(255,255,255,.05);border-radius:11px;padding:10px;font:11px/1.45 ui-monospace,SFMono-Regular,Menlo,monospace}.offline-note,.setup-note{margin-top:10px;background:#262421;border-radius:11px;padding:10px;font-size:11px;color:#9e9992}.offline-note strong{display:block;color:#d9e7cf;margin-bottom:3px}.offline-note span{display:block}.offline-note code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.disabled-field{opacity:.48}.setup-tools{display:grid;grid-template-columns:repeat(6,1fr);gap:7px}.piece-tool{background:#262421;border:2px solid transparent;border-radius:10px;padding:5px}.piece-tool.selected{border-color:var(--accent);background:#303f27}.piece-tool img{width:100%;aspect-ratio:1;object-fit:contain}.black-tool{background:#242321}.settings-drawer{position:fixed;inset:0;z-index:50;pointer-events:none}.settings-drawer.open{pointer-events:auto}.drawer-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.5);opacity:0;transition:opacity .2s}.settings-drawer.open .drawer-backdrop{opacity:1}.drawer{position:absolute;right:0;top:0;bottom:0;width:min(390px,92vw);background:#302d2a;border-left:1px solid rgba(255,255,255,.06);padding:16px;transform:translateX(100%);transition:transform .24s ease;overflow:auto;box-shadow:-20px 0 60px rgba(0,0,0,.4)}.settings-drawer.open .drawer{transform:translateX(0)}.drawer-head{display:flex;justify-content:space-between;gap:10px}.drawer-head h2{margin:0;font-size:19px}.drawer-head p{font-size:11px;color:var(--muted);margin:4px 0 14px}.promotion-modal{position:fixed;inset:0;z-index:70;background:rgba(0,0,0,.58);display:grid;place-items:center}.promotion-card{background:#302d2a;border:1px solid rgba(255,255,255,.08);border-radius:18px;padding:18px;box-shadow:var(--shadow)}.promotion-card h3{margin:0 0 12px}.promotion-grid{display:grid;grid-template-columns:repeat(4,75px);gap:8px}.promotion-grid button{background:#3a3734;border:0;border-radius:10px;padding:5px}.promotion-grid img{width:100%;aspect-ratio:1;object-fit:contain}.toast{position:fixed;left:50%;bottom:22px;transform:translate(-50%,20px);padding:10px 14px;border-radius:11px;background:#181715;color:#f4f1eb;border:1px solid rgba(255,255,255,.08);opacity:0;pointer-events:none;transition:all .2s;z-index:100;font-weight:800;font-size:12px}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:1080px){.layout{grid-template-columns:1fr}.side-panel{max-width:none}.board-wrap{max-width:min(92vw,820px)}}
@media(max-width:640px){.app-shell{padding:8px 7px 18px}.topbar{align-items:flex-start}.brand-mark{width:40px;height:40px}.brand-name{font-size:14px}.brand-subtitle{font-size:10px}.engine-mode-control{padding:4px 5px}.engine-mode-control span{display:none}.engine-mode-control select{padding:7px 18px 7px 7px;font-size:11px}.icon-btn{width:37px;height:37px}.player-card,.engine-card{border-radius:13px}.player-card{padding:9px}.board-wrap{border-radius:6px}.piece{width:96%;height:96%}.toolbar-btn{padding:9px 11px;font-size:12px}.hint-strip{font-size:10px}.hint-strip span:last-child{display:none}.moves-list{max-height:360px}.drawer{width:94vw}.setup-tools{grid-template-columns:repeat(6,1fr)}.promotion-grid{grid-template-columns:repeat(4,62px)}}

.focus-hint{display:none}
@media(min-width:641px){
  body.board-focus .app-shell{max-width:none;padding:0;background:#1f1d1b}
  body.board-focus .topbar,body.board-focus .player-card,body.board-focus .engine-card,body.board-focus .board-toolbar,body.board-focus .hint-strip,body.board-focus .side-panel{display:none}
  body.board-focus .layout{display:block}
  body.board-focus .board-column{width:100vw;min-height:100vh;display:grid;place-items:center}
  body.board-focus .board-wrap{width:min(100vw,100vh);height:min(100vw,100vh);max-width:none;border-radius:0;box-shadow:none}
  body.board-focus .focus-hint{display:block;position:fixed;left:50%;bottom:14px;transform:translateX(-50%);z-index:80;background:rgba(20,19,17,.82);padding:8px 12px;border-radius:999px;font-size:11px;color:#ddd8d1}
}
@media(max-width:640px){
  body.board-focus{overflow:hidden;background:#000}
  body.board-focus .app-shell{padding:0}
  body.board-focus .topbar,body.board-focus .player-card,body.board-focus .engine-card,body.board-focus .board-toolbar,body.board-focus .hint-strip,body.board-focus .side-panel{display:none}
  body.board-focus .layout{display:block}
  body.board-focus .board-column{width:100vw;height:100dvh;display:grid;place-items:center}
  body.board-focus .board-wrap{width:100vw;height:100vw;max-width:none;border-radius:0;box-shadow:none}
  body.board-focus .focus-hint{display:block;position:fixed;left:50%;bottom:10px;transform:translateX(-50%);z-index:80;white-space:nowrap;background:rgba(20,19,17,.84);padding:7px 10px;border-radius:999px;font-size:10px;color:#ddd8d1}
}

.input-hint{margin-top:7px;font-size:10px;line-height:1.45;color:var(--muted)}
.input-hint code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:#d9d5ce}
.three-actions{grid-template-columns:repeat(3,1fr)}
.focus-exit{display:none;position:fixed;right:max(12px,env(safe-area-inset-right));top:max(12px,env(safe-area-inset-top));z-index:120;width:44px;height:44px;border:1px solid rgba(255,255,255,.15);border-radius:50%;background:rgba(24,23,21,.9);color:#f5f2ec;font-size:22px;font-weight:900;box-shadow:0 8px 28px rgba(0,0,0,.35);touch-action:manipulation}
.focus-exit.hidden{display:none!important}
@media(max-width:640px){.three-actions{grid-template-columns:1fr 1fr}.three-actions #copyBestBtn{grid-column:1/-1}.focus-exit{display:none}}
body.board-focus .focus-exit{display:grid;place-items:center}
@media(max-width:640px){body.board-focus .focus-exit{display:grid}}

/* Mobile/WebView robustness */
html{overscroll-behavior:none} body{overscroll-behavior-y:none} .board{touch-action:none;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none} .square{touch-action:none} button,input,select{font:inherit} @media(max-width:420px){.board-toolbar{gap:5px}.toolbar-btn{padding:9px 10px;font-size:12px}.hint-strip{font-size:10px}.moves-list{max-height:45vh}.promotion-grid{grid-template-columns:repeat(4,minmax(58px,1fr))}.promotion-card{max-width:94vw}.engine-console{max-height:150px}}


/* ---------- Board / MultiPV / focus hardening ---------- */
:root{
  --board-light:#eeeed2;
  --board-dark:#769656;
  --board-light-text:#45e9ff;
  --board-dark-text:#f4f4f4;
}

.board-wrap{
  position:relative;
  width:min(100%, 900px);
  aspect-ratio:1 / 1;
  min-width:0;
  min-height:0;
  margin-inline:auto;
  border-radius:12px;
  overflow:hidden;
  background:var(--board-dark);
  box-shadow:0 16px 44px rgba(0,0,0,.42),0 0 0 1px rgba(0,0,0,.2);
}

.board{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  display:grid;
  grid-template-columns:repeat(8,minmax(0,1fr));
  grid-template-rows:repeat(8,minmax(0,1fr));
  grid-auto-flow:row;
  min-width:0;
  min-height:0;
  overflow:hidden;
  background:var(--board-dark);
}

.square{
  position:relative;
  min-width:0;
  min-height:0;
  width:100%;
  height:100%;
  display:grid;
  place-items:center;
  overflow:hidden;
}
.square.light{background:var(--board-light)}
.square.dark{background:var(--board-dark)}
.square .piece{
  position:relative;
  z-index:4;
  width:90%;
  height:90%;
  max-width:100%;
  max-height:100%;
  object-fit:contain;
  display:block;
  pointer-events:none;
  user-select:none;
  -webkit-user-drag:none;
  transition:transform .12s ease,filter .12s ease;
  filter:drop-shadow(0 2px 1px rgba(0,0,0,.26));
}
.square:active .piece{transform:scale(.95)}
.square.last-move:before,.square.selected:before,.square.engine-best:before{z-index:1}
.square.last-move:before{background:rgba(246,196,83,.52)}
.square.selected:before{background:rgba(255,235,120,.64)}
.square.engine-best:before{background:rgba(232, 255, 50, 0.60)}

.coord-rank,.coord-file{
  position:absolute;
  z-index:6;
  font-size:clamp(9px,1.3vw,13px);
  line-height:1;
  font-weight:900;
  pointer-events:none;
  text-transform:lowercase;
}
.coord-rank{top:5px;left:5px}
.coord-file{right:5px;bottom:5px}
.square.light .coord-rank,.square.light .coord-file{color:var(--board-dark-text)}
.square.dark .coord-rank,.square.dark .coord-file{color:var(--board-dark-text)}

.square.legal:after,.square.capture:after{z-index:5}
.square.legal:after{
  width:20%;height:20%;
  background:rgba(26,35,18,.28);
  box-shadow:none;
}
.square.capture:after{
  inset:7%;
  border:5px solid rgba(255,255,255,.82);
  box-shadow:inset 0 0 0 3px rgba(129,182,76,.75);
}

.engine-arrows{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  z-index:7;
  pointer-events:none;
  overflow:visible;
}
.engine-arrow{
  fill:none;
  stroke:#30fffc;
  stroke-linecap:round;
  stroke-width:5.5;
  filter:url(#engineArrowShadow);
  opacity:.86;
  vector-effect:non-scaling-stroke;
}
.engine-arrow.primary{stroke-width:5.8;opacity:1}
.engine-arrow.alternative{opacity:.72}

.engine-side-control{display:flex;flex-direction:column;align-items:flex-end;gap:5px}
.engine-side-control span{font-size:10px;color:var(--muted);font-weight:800;text-transform:uppercase;letter-spacing:.7px}
.engine-side-control select{background:#211f1d;color:var(--text);border:1px solid rgba(255,255,255,.07);border-radius:9px;padding:7px 8px;font-weight:900}
.engine-side-hint{margin-top:-4px;margin-bottom:8px;padding:9px 10px;border-radius:10px;background:rgba(129,182,76,.08);border:1px solid rgba(129,182,76,.18);color:#dce9d2;font-size:10px;font-weight:800}

.focus-btn{min-width:0}
.focus-exit{backdrop-filter:blur(8px)}

body.board-focus{
  overflow:hidden;
  background:#000;
}
body.board-focus .app-shell{max-width:none;width:100vw;min-height:100dvh;padding:0;background:#000}
body.board-focus .topbar,
body.board-focus .player-card,
body.board-focus .engine-card,
body.board-focus .board-toolbar,
body.board-focus .hint-strip,
body.board-focus .side-panel{display:none}
body.board-focus .layout{display:block;width:100vw;min-height:100dvh}
body.board-focus .board-column{width:100vw;height:100dvh;min-height:100dvh;display:grid;place-items:center}
body.board-focus .board-wrap{
  width:min(100vw,100dvh);
  height:min(100vw,100dvh);
  max-width:none;
  aspect-ratio:1/1;
  border-radius:0;
  box-shadow:none;
}
body.board-focus .focus-hint{display:block}

@media(max-width:640px){
  .board-wrap{width:100%;max-width:100%;border-radius:6px}
  .board-toolbar{display:grid;grid-template-columns:repeat(5,minmax(0,1fr))}
  .toolbar-btn{min-width:0;padding:9px 7px;font-size:11px}
  .toolbar-btn span{white-space:nowrap}
  .engine-side-control{align-items:stretch}
  .engine-side-control select{min-width:104px}
  body.board-focus .board-wrap{width:100vw;height:100vw}
  body.board-focus .board-column{padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom)}
}

@media(min-width:641px){
  body.board-focus .board-wrap{width:min(100vw,100vh);height:min(100vw,100vh)}
}


/* ---------- Premium engine controls / priority arrows ---------- */
.autoplay-row{margin-top:2px;padding:11px 12px;border-radius:12px;background:linear-gradient(135deg,rgba(125,87,255,.12),rgba(52,211,153,.06));border:1px solid rgba(125,87,255,.18)}
.autoplay-row span{font-weight:900}
.autoplay-hint{margin-top:-2px;margin-bottom:10px;padding:8px 10px;border-radius:9px;background:rgba(255,255,255,.035);border:1px solid rgba(255,255,255,.06);color:var(--muted);font-size:10px;line-height:1.45;font-weight:800}
.arrow-legend{display:flex;flex-wrap:wrap;gap:7px 10px;align-items:center;padding:9px 10px;margin-bottom:11px;border-radius:10px;background:rgba(0,0,0,.15);border:1px solid rgba(255,255,255,.06);font-size:10px;font-weight:900;color:#d8d4cc}
.arrow-legend .legend-title{width:100%;font-size:9px;letter-spacing:1px;color:var(--muted)}
.arrow-legend span:not(.legend-title){display:inline-flex;align-items:center;gap:5px}
.legend-dot{display:inline-block;width:8px;height:8px;border-radius:50%}
.legend-dot.priority-1{background:#8b5cf6}.legend-dot.priority-2{background:#38bdf8}.legend-dot.priority-3{background:#5fbf68}.legend-dot.priority-4{background:#f1c232}.legend-dot.priority-5{background:#ef4444}
.engine-arrow.priority-1{stroke:#8b5cf6;stroke-width:6.2;opacity:1}
.engine-arrow.priority-2{stroke:#38bdf8;stroke-width:5.6;opacity:.9}
.engine-arrow.priority-3{stroke:#5fbf68;stroke-width:5.3;opacity:.84}
.engine-arrow.priority-4{stroke:#f1c232;stroke-width:5.1;opacity:.78}
.engine-arrow.priority-5{stroke:#ef4444;stroke-width:4.9;opacity:.74}
.arrow-head.priority-1{fill:#8b5cf6}.arrow-head.priority-2{fill:#38bdf8}.arrow-head.priority-3{fill:#5fbf68}.arrow-head.priority-4{fill:#f1c232}.arrow-head.priority-5{fill:#ef4444}

.setup-rights{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin:10px 0;padding:10px;border-radius:10px;background:rgba(255,255,255,.035);border:1px solid rgba(255,255,255,.06);font-size:10px;font-weight:800}
.setup-rights>span{grid-column:1/-1;color:var(--muted);text-transform:uppercase;letter-spacing:.8px}
.setup-rights label{display:flex;align-items:center;gap:6px;color:#d9d5ce}
.setup-rights input{accent-color:#8b5cf6}

/* Premium board interaction layer */
.board-wrap { isolation:isolate; }
.board-overlay { pointer-events:none !important; }

/* A real board-level travelling piece. It is positioned over the board,
   starts exactly on the source square, and remains fully visible while it
   translates to the destination. No opacity fade and no teleporting. */
.move-piece{
  position:absolute;
  z-index:35;
  object-fit:contain;
  pointer-events:none;
  user-select:none;
  will-change:transform;
  filter:drop-shadow(0 4px 3px rgba(0,0,0,.32));
  transform-origin:center center;
}

.autoplay-control{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:10px;padding:12px 14px;border:1px solid rgba(129,182,76,.22);border-radius:14px;background:linear-gradient(135deg,rgba(129,182,76,.12),rgba(255,255,255,.025));box-shadow:inset 0 1px rgba(255,255,255,.035)}
.autoplay-control strong{display:block;font-size:13px;font-weight:900;letter-spacing:.1px}
.autoplay-control > div > span{display:block;margin-top:4px;color:var(--muted);font-size:10px;line-height:1.4;font-weight:700}
.switch{position:relative;display:inline-flex;flex:0 0 auto;cursor:pointer}
.switch input{position:absolute;opacity:0;pointer-events:none}
.switch-track{position:relative;width:48px;height:28px;border-radius:999px;background:#49453f;box-shadow:inset 0 0 0 1px rgba(255,255,255,.07), inset 0 2px 5px rgba(0,0,0,.18);transition:background .2s ease,box-shadow .2s ease}
.switch-thumb{position:absolute;left:4px;top:4px;width:20px;height:20px;border-radius:50%;background:#f1eee8;box-shadow:0 2px 6px rgba(0,0,0,.28);transition:transform .22s cubic-bezier(.2,.8,.2,1)}
.switch input:checked + .switch-track{background:linear-gradient(180deg,var(--accent),var(--accent2));box-shadow:0 0 0 1px rgba(129,182,76,.25),0 5px 15px rgba(129,182,76,.22)}
.switch input:checked + .switch-track .switch-thumb{transform:translateX(20px)}
.switch input:focus-visible + .switch-track{outline:2px solid var(--accent);outline-offset:3px}

@media(max-width:640px){.autoplay-control{padding:11px 12px}.autoplay-control strong{font-size:12px}.switch-track{width:46px;height:27px}.switch-thumb{width:19px;height:19px}.switch input:checked + .switch-track .switch-thumb{transform:translateX(19px)}}

/* Movement-time control */
.field > span output{
  color:var(--accent);
  font-variant-numeric:tabular-nums;
  font-weight:900;
}
#moveAnimationInput{
  width:100%;
  accent-color:var(--accent);
}