:root{
  --bg1:#0b1220;
  --bg2:#071a2a;
  --panel: rgba(255,255,255,0.03);
  --muted:#9fb0c6;
  --accent:#5aa2ff;
  --success:#22c55e;
  --danger:#ef4444;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial;background:linear-gradient(180deg,var(--bg1),var(--bg2));color:#eaf4ff}
.app{max-width:980px;margin:28px auto;padding:16px;display:flex;flex-direction:column;gap:14px}
.top{display:flex;justify-content:space-between;align-items:center;gap:12px}
.brand{display:flex;align-items:center;gap:10px}
.logo{width:56px;height:56px;border-radius:10px;background:linear-gradient(180deg,#1f2a44,#152338);display:grid;place-items:center;font-weight:800}
.top-controls{display:flex;gap:12px;align-items:center}
.control-group{display:flex;flex-direction:column;gap:6px}
select,button{padding:8px 10px;border-radius:8px;border:1px solid rgba(255,255,255,0.05);background:transparent;color:inherit;cursor:pointer;font-weight:700}
.btn{background:linear-gradient(180deg, rgba(255,255,255,0.02), transparent)}
.btn.alt{background:transparent;border:1px solid rgba(255,255,255,0.04)}
.subtitle{color:var(--muted);font-size:13px}
.main{display:flex;gap:16px;align-items:flex-start}
.board-card{flex:1;padding:14px;border-radius:12px;background:var(--panel);border:1px solid rgba(255,255,255,0.03)}
.board{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding:12px;border-radius:10px}
.cell{aspect-ratio:1/1;border-radius:8px;background:linear-gradient(180deg, rgba(255,255,255,0.01), rgba(0,0,0,0.02));display:grid;place-items:center;font-size:64px;font-weight:900;cursor:pointer;transition:transform .12s ease,box-shadow .12s}
.cell:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(0,0,0,0.55)}
.cell.disabled{cursor:not-allowed;opacity:.6}
.mark-X{color:#ffd7d7}
.mark-O{color:#dffaff}
.win-svg{position:absolute;left:0;top:0;width:100%;height:100%;pointer-events:none}

.side-panel{width:300px;display:flex;flex-direction:column;gap:12px}
.card{background:var(--panel);padding:12px;border-radius:10px;border:1px solid rgba(255,255,255,0.03)}
.status-text{font-weight:800}
.ai-message{margin-top:6px}
.scorecard{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;text-align:center}
.big{font-size:20px;font-weight:900}
.move-log{margin:8px 0 0 0;padding:0;max-height:220px;overflow:auto}
.move-log li{list-style:none;padding:8px;border-radius:8px;background:rgba(255,255,255,0.015);margin-bottom:8px;font-weight:700}
.actions{display:flex;gap:8px}
.footer{text-align:center;color:var(--muted);font-size:13px}

.layer{position:fixed;left:0;top:0;width:100%;height:100%;pointer-events:none;z-index:50}
#confetti{z-index:55;display:block}

.modal{position:fixed;inset:0;display:none;align-items:center;justify-content:center;background:linear-gradient(180deg,rgba(3,6,10,0.45),rgba(3,6,10,0.6));z-index:80}
.modal-card{background:linear-gradient(180deg,#071426,#081627);padding:18px;border-radius:12px;border:1px solid rgba(255,255,255,0.04);text-align:center;color:#eaf4ff}
.modal-emoji{font-size:48px;margin-bottom:6px}
.modal-actions{display:flex;gap:8px;justify-content:center;margin-top:12px}

/* responsive */
@media (max-width:980px){
  .main{flex-direction:column}
  .side-panel{width:100%}
  .board{gap:8px}
}