:root{
  --bg:#0b0d12; --panel:#141821; --panel2:#0f131b; --ink:#e9edf6; --dim:#95a1b8;
  --line:#242c3a; --accent:#e0b15e; --accent2:#7fa8ff; --live:#6fe08a; --warm:#d98c3a;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--bg);color:var(--ink);
  font:15px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;overflow:hidden}
.boot{position:fixed;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;
  color:var(--dim);text-align:center;gap:6px}
#blazor-error-ui{position:fixed;bottom:0;left:0;right:0;background:#7c1d1d;color:#fff;padding:8px 14px;z-index:50}

.arena{display:flex;height:100vh;width:100vw}
.stage{flex:1;position:relative;background:radial-gradient(120% 90% at 50% 10%,#161b25,#080a0e);
  display:flex;align-items:center;justify-content:center;overflow:hidden}
#board3d{width:100%;height:100%;object-fit:contain;image-rendering:auto;cursor:grab;touch-action:none}
#board3d:active{cursor:grabbing}
.overlay-status{position:absolute;top:12px;left:16px;background:rgba(8,10,14,.68);border:1px solid var(--line);
  padding:7px 13px;border-radius:9px;font-weight:600;letter-spacing:.01em;backdrop-filter:blur(4px)}
.overlay-hint{position:absolute;bottom:10px;left:16px;color:var(--dim);font-size:12px;
  background:rgba(8,10,14,.5);padding:4px 10px;border-radius:8px}

.panel{width:340px;min-width:340px;background:linear-gradient(180deg,var(--panel),var(--panel2));
  border-left:1px solid var(--line);padding:16px 16px 20px;display:flex;flex-direction:column;gap:12px;
  overflow-y:auto}
h1{font-size:22px;margin:0;letter-spacing:-.02em}
h1 span{color:var(--accent)}
.tag{margin:0;color:var(--dim);font-size:12.5px}

.seg{border:1px solid var(--line);border-radius:11px;padding:11px 12px;background:rgba(255,255,255,.012)}
.seg.grow{flex:1;min-height:120px;display:flex;flex-direction:column}
.lab{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--dim);margin-bottom:7px}
.row{display:flex;gap:7px;margin-bottom:7px}
.row:last-child{margin-bottom:0}
button{flex:1;background:#1b2130;color:var(--ink);border:1px solid var(--line);border-radius:8px;
  padding:8px 9px;font-size:13px;cursor:pointer;transition:border-color .12s,background .12s}
button:hover:not(:disabled){border-color:var(--accent2)}
button:disabled{opacity:.4;cursor:not-allowed}
button.on{background:linear-gradient(180deg,#2a63c8,#224fa0);border-color:#3a6fd0;font-weight:600}
button.wide{width:100%;margin-top:8px}
select,input[type=range]{width:100%;background:#0d1220;color:var(--ink);border:1px solid var(--line);
  border-radius:8px;padding:7px 9px;font-size:13px}
input[type=range]{padding:4px 0}

.sugg{border-color:#3a4d2e;background:rgba(120,224,138,.05)}
.suggmove{font-size:19px;font-weight:700;color:var(--live)}
.suggmove .sc{font-size:13px;color:var(--dim);font-weight:500;margin-left:8px}
.note{margin:8px 0 0;font-size:12px;color:var(--dim)}

.evalbar{height:12px;border-radius:6px;background:#0a0d15;border:1px solid var(--line);overflow:hidden}
.evalfill{height:100%;background:linear-gradient(90deg,#3a4356,#e9edf6);transition:width .3s}
.evalnum{margin-top:6px;font-size:12px;color:var(--dim)}

.scores{flex:1;overflow-y:auto;font-size:13.5px;font-variant-numeric:tabular-nums}
.mrow{display:flex;gap:8px;padding:2px 0}
.no{color:var(--dim);width:26px;text-align:right}
.mv{cursor:pointer;padding:1px 7px;border-radius:6px;min-width:52px}
.mv:hover{background:#1b2130}
.mv.cur{background:var(--accent);color:#20160a;font-weight:700}

@media (max-width:820px){
  .arena{flex-direction:column}
  .panel{width:100%;min-width:0;max-height:44vh;border-left:none;border-top:1px solid var(--line)}
}

/* draughts material readout */
.matrow{font-size:13.5px;padding:2px 0;display:flex;align-items:center;gap:8px}
.matrow .red{color:#e0554f;font-size:16px}
.matrow .wht{color:#efe8d6;font-size:16px}
.scores .mrow{font-variant-numeric:tabular-nums;color:var(--dim);padding:1px 0}