:root{
  --bg:#0b1220;
  --card:#111a2e;
  --muted:#93a4c7;
  --text:#eaf0ff;
  --accent:#7dd3fc;
  --danger:#fb7185;
  --ok:#34d399;
  --squareLight:#f2e8d8;
  --squareDark:#2f7a5a;
  --ring: rgba(125,211,252,.35);
}
*{box-sizing:border-box}
body{
  margin:0; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji","Segoe UI Emoji";
  background: radial-gradient(1200px 600px at 20% 10%, #152245 0%, var(--bg) 55%);
  color:var(--text);
}
.topbar{
  display:flex; gap:16px; align-items:center; justify-content:space-between;
  padding:18px 20px; border-bottom:1px solid rgba(255,255,255,.06);
}
h1{margin:0; font-size:20px; letter-spacing:.2px}
.sub{margin:4px 0 0; color:var(--muted); font-size:13px}
.controls{display:flex; gap:10px; align-items:end; flex-wrap:wrap}
label{display:flex; flex-direction:column; gap:6px; font-size:12px; color:var(--muted)}
select, button{
  border-radius:14px; border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.05); color:var(--text);
  padding:10px 12px; font-weight:600;
}
button{cursor:pointer}
button:hover{border-color:rgba(125,211,252,.5); box-shadow:0 0 0 4px var(--ring)}
.layout{display:grid; grid-template-columns: 340px minmax(280px, 1fr); gap:18px; padding:18px; max-width:1100px; margin:0 auto}
.panel{
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border:1px solid rgba(255,255,255,.08);
  border-radius:18px; padding:14px;
  box-shadow: 0 16px 36px rgba(0,0,0,.30);
}
.clock{padding:10px; border-radius:14px; background: rgba(0,0,0,.18); border:1px solid rgba(255,255,255,.06)}
.clockRow{display:flex; justify-content:space-between; align-items:center; padding:8px 10px}
.label{color:var(--muted); font-weight:700; font-size:12px; text-transform:uppercase; letter-spacing:.08em}
.time{font-size:28px; font-weight:800}
.hint{padding:10px; color:var(--muted); font-size:13px; border-top:1px solid rgba(255,255,255,.06)}
.moves{margin-top:12px}
.moves h2{margin:6px 0 8px; font-size:14px; color:var(--muted); text-transform:uppercase; letter-spacing:.08em}
#moveList{margin:0; padding-left:18px; max-height:280px; overflow:auto}
#moveList li{padding:3px 0; font-size:13px}
.note{margin-top:12px; font-size:12px; color:var(--muted); line-height:1.4}
.boardWrap{display:flex; justify-content:center; align-items:flex-start}
.board{
  width:min(70vh, 620px);
  aspect-ratio:1/1;
  display:grid;
  grid-template-columns: repeat(8, 1fr);
  border-radius:22px;
  overflow:hidden;
  border:1px solid rgba(255,255,255,.10);
  box-shadow: 0 18px 42px rgba(0,0,0,.35);
}
.square{
  display:flex; align-items:center; justify-content:center;
  position:relative;
  user-select:none;
}
.square.light{background:var(--squareLight)}
.square.dark{background:var(--squareDark)}
.square.selected{outline:4px solid rgba(125,211,252,.75); outline-offset:-4px}
.square.legal::after{
  content:"";
  width:22%; height:22%;
  border-radius:999px;
  background: rgba(17, 26, 46, .25);
  box-shadow: inset 0 0 0 2px rgba(17,26,46,.20);
  position:absolute;
}
.square.capture::after{
  content:"";
  width:68%; height:68%;
  border-radius:999px;
  border: 4px solid rgba(17,26,46,.28);
  position:absolute;
}
.piece{font-size:40px; filter: drop-shadow(0 6px 6px rgba(0,0,0,.25));}
.footer{padding:12px 20px; color:var(--muted); font-size:12px; border-top:1px solid rgba(255,255,255,.06)}
@media (max-width: 900px){
  .layout{grid-template-columns:1fr;}
  .board{width:min(92vw, 620px)}
}