:root{
  --bg:#0e0f12; --panel:#171a21; --muted:#9aa4b2; --accent:#3b82f6; --warn:#f59e0b;
  --danger:#ef4444; --tile-light:#e5e7eb; --tile-dark:#374151; --piece-red:#ef4444; --piece-black:#111827; --king:#f59e0b; --ok:#22c55e;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:#fff;font:14px/1.4 system-ui,Segoe UI,Roboto,Arial}
.container{max-width:1040px;margin:24px auto;padding:0 16px}
.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.topbar h1{margin:0;font-size:22px}
.right{display:flex;gap:8px;align-items:center}
a.repo{color:#c7d2fe;text-decoration:none;border:1px solid #2e2f39;padding:6px 10px;border-radius:8px}
a.repo:hover{border-color:#3b82f6}
.btn{background:var(--accent);border:0;color:#fff;padding:8px 14px;border-radius:10px;cursor:pointer;font-weight:600}
.btn.subtle{background:#2b2f3a}
.btn.warn{background:var(--warn);color:#111}
.btn:hover{filter:brightness(1.06)}
.lbl{display:block;margin:6px 0 4px 0}
.input{width:100%;padding:10px;border-radius:8px;border:1px solid #2b2f3a;background:#0f1116;color:#fff}
.small{font-size:12px;margin-top:6px}
.muted{color:var(--muted)}

.card{background:var(--panel);padding:16px;border-radius:12px}
.lobby{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.hidden{display:none}

.hud{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}
.pill{background:var(--panel);padding:8px 10px;border-radius:999px;border:1px solid #2e2f39}

.board-wrap{display:grid;grid-template-columns:1fr 260px;gap:16px}
.board{width:100%;aspect-ratio:1/1;display:grid;grid-template-columns:repeat(8,1fr);border-radius:12px;overflow:hidden;box-shadow:0 10px 30px rgba(0,0,0,.4)}
.square{position:relative;width:100%;height:100%}
.square.light{background:var(--tile-light)}
.square.dark{background:var(--tile-dark)}
.square.hl-move::after{content:"";position:absolute;inset:6px;border:3px dashed var(--ok);border-radius:10px}
.square.hl-capture::after{content:"";position:absolute;inset:6px;border:3px dashed var(--danger);border-radius:10px}
.piece{position:absolute;inset:8px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  box-shadow:inset 0 0 0 3px rgba(255,255,255,.22),0 6px 12px rgba(0,0,0,.45)}
.piece.red{background:var(--piece-red)}
.piece.black{background:var(--piece-black)}
.piece.selected{outline:4px solid var(--ok)}
.crown{position:absolute;bottom:6px;left:50%;transform:translateX(-50%);font-size:18px;color:var(--king);text-shadow:0 1px 3px rgba(0,0,0,.7)}

.side{background:var(--panel);border-radius:12px;padding:12px}
.help h3{margin:0 0 8px}
.help ul{margin:0 0 10px 18px;color:var(--muted)}
.log{max-height:300px;overflow:auto;border-top:1px solid #2b2f3a;padding-top:8px;color:var(--muted);font-size:12px}

@media (max-width:960px){
  .lobby{grid-template-columns:1fr}
  .board-wrap{grid-template-columns:1fr}
}