:root{
  --bg: #0f1724;
  --card: #0b1220;
  --accent: #7b61ff;
  --accent-2: #00e0a8;
  --muted: #94a3b8;
  --glass: rgba(255,255,255,0.03);
  --shadow: 0 10px 30px rgba(2,6,23,0.6);
  --win: #ffd166;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  color-scheme: dark;
}

*{box-sizing:border-box}
html,body{height:100%;margin:0;background:
  radial-gradient(600px 400px at 10% 10%, rgba(123,97,255,0.06), transparent 6%),
  radial-gradient(500px 300px at 90% 80%, rgba(0,224,168,0.03), transparent 6%),
  var(--bg);
  -webkit-font-smoothing:antialiased;
  display:flex;align-items:center;justify-content:center;padding:18px;
}

.app{
  width:100%;max-width:980px;background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius:14px;padding:18px;box-shadow:var(--shadow);display:grid;grid-template-columns:360px 1fr;gap:20px;
}

/* panel */
.panel{background:linear-gradient(180deg,var(--glass),transparent);border-radius:10px;padding:14px;min-height:380px;position:relative}
.head{display:flex;justify-content:space-between;align-items:center}
.brand{display:flex;align-items:center;gap:12px}
.logo{width:42px;height:42px;border-radius:8px;display:grid;place-items:center;font-weight:800;color:white;background:linear-gradient(135deg,var(--accent),var(--accent-2));transform:rotate(-8deg)}
h1{margin:0;font-size:18px}
.made-by{font-size:12px;color:var(--muted)}
.btn{background:transparent;border:1px solid rgba(255,255,255,0.04);padding:8px 10px;border-radius:8px;cursor:pointer;color:#e6eef8;font-weight:600}
.btn.primary{background:linear-gradient(90deg,var(--accent),var(--accent-2));border:0;box-shadow:0 8px 20px rgba(123,97,255,0.12)}
.btn.small{padding:6px 8px;font-size:13px}
.select{background:transparent;border:1px solid rgba(255,255,255,0.04);padding:8px;border-radius:8px;color:#e6eef8}
.inputs{margin-top:12px;display:flex;flex-direction:column;gap:10px}
label{display:flex;flex-direction:column;gap:6px}
.label-text{font-size:13px;color:var(--muted)}
input[type="text"]{background:transparent;border:0;border-bottom:1px dashed rgba(255,255,255,0.04);padding:6px 0;color:#e6eef8;font-size:15px;outline:none}

/* scoreboard */
.scoreboard{margin-top:16px;display:flex;flex-direction:column;gap:10px}
.score{display:flex;justify-content:space-between;align-items:center;padding:10px;border-radius:10px;background:linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.006));border:1px solid rgba(255,255,255,0.03)}
.score .label{font-size:13px;color:var(--muted)}
.score .value{font-size:20px;font-weight:700}
.controls{display:flex;gap:8px;margin-top:10px}
.small-gap{gap:8px;display:flex}

/* board */
.board-wrap{display:flex;flex-direction:column;gap:14px;min-height:380px}
.status{display:flex;justify-content:space-between;align-items:center}
.turn{display:flex;align-items:center;gap:12px}
.avatar{width:48px;height:48px;border-radius:8px;display:grid;place-items:center;background:linear-gradient(135deg,var(--glass),transparent);border:1px solid rgba(255,255,255,0.03);font-weight:800}
.who{font-weight:700}
.sub{font-size:12px;color:var(--muted)}
.muted{color:var(--muted)}
.board{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding:12px;background:linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.006));border-radius:12px;border:1px solid rgba(255,255,255,0.03);position:relative;min-height:320px;align-content:center}
.cell{aspect-ratio:1/1;background:linear-gradient(180deg, rgba(255,255,255,0.02), transparent);border-radius:10px;display:grid;place-items:center;font-size:48px;cursor:pointer;color:rgba(255,255,255,0.96);user-select:none;transition:transform 160ms cubic-bezier(.2,.9,.3,1),box-shadow 160ms;border:1px solid rgba(255,255,255,0.02)}
.cell:hover{transform:translateY(-6px) scale(1.03);box-shadow:0 12px 30px rgba(2,6,23,0.6)}
.cell.taken{cursor:default;transform:none;box-shadow:none;opacity:0.98}
.cell.x{color:var(--accent);text-shadow:0 6px 20px rgba(123,97,255,0.12)}
.cell.o{color:var(--accent-2);text-shadow:0 6px 20px rgba(0,224,168,0.08)}
.cell.win{animation:pop 600ms cubic-bezier(.16,.8,.3,1) both;box-shadow:0 18px 40px rgba(255,200,60,0.12);transform:translateY(-8px) scale(1.07);border:1px solid rgba(255,255,255,0.06)}
@keyframes pop{0%{transform:scale(.85) rotate(-6deg);opacity:0.6}60%{transform:scale(1.08) rotate(3deg);opacity:1}100%{transform:scale(1.07) rotate(0deg)}}

.overlay{position:absolute;inset:0;pointer-events:none}
.board-controls{display:flex;justify-content:space-between;align-items:center;margin-top:8px}

/* confetti */
canvas.confetti{position:fixed;left:0;top:0;width:100%;height:100%;pointer-events:none;z-index:9999}

/* responsiveness */
@media (max-width:880px){
  .app{grid-template-columns:1fr;padding:12px}
  .board{min-height:260px}
  .cell{font-size:calc(6vw + 12px)}
}