:root{
  --bg: #0f1724;
  --card: #0b1220;
  --accent: #7dd3fc;
  --accent-2: #fda4af;
  --muted: #94a3b8;
  --win: #10b981;
  --cell-size: min(90px, 20vmin);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  display:flex;
  align-items:center;
  justify-content:center;
  background: linear-gradient(180deg,#071021 0%, #081524 100%);
  color:#e6eef6;
  padding:24px;
}

.app {
  width:min(720px, 96vw);
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border:1px solid rgba(255,255,255,0.04);
  border-radius:14px;
  padding:18px;
  box-shadow: 0 8px 30px rgba(2,6,23,0.6);
}

header{
  display:flex;
  gap:12px;
  align-items:center;
  justify-content:space-between;
  margin-bottom:12px;
}
.title {
  display:flex;
  gap:12px;
  align-items:center;
}
.logo {
  width:46px;height:46px;
  display:grid;place-items:center;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#032;
  font-weight:700;
  border-radius:8px;
}
h1{font-size:1.05rem;margin:0}
p.lead{margin:0;font-size:.86rem;color:var(--muted)}

.controls{display:flex;gap:8px;align-items:center}

.segmented {
  background:transparent;
  border:1px solid rgba(255,255,255,0.06);
  padding:6px;
  border-radius:8px;
  display:flex;
  gap:6px;
}
.segmented button {
  padding:8px 10px;
  border-radius:6px;
  border:0;
  background:transparent;
  color:var(--muted);
  cursor:pointer;
  font-weight:600;
}
.segmented button.active{
  color:#042;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
}

main {display:flex;gap:18px;align-items:flex-start;flex-wrap:wrap}

.board-wrap{
  padding:12px;
  background:linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.02));
  border-radius:10px;
  border:1px solid rgba(255,255,255,0.03);
  display:flex;
  flex-direction:column;
  gap:12px;
  align-items:center;
}

.board {
  display:grid;
  grid-template-columns: repeat(3, var(--cell-size));
  grid-template-rows: repeat(3, var(--cell-size));
  gap:8px;
  padding:8px;
}
.cell {
  width:var(--cell-size);
  height:var(--cell-size);
  display:grid;place-items:center;
  background:rgba(255,255,255,0.02);
  border-radius:10px;
  font-size:calc(var(--cell-size) * 0.5);
  font-weight:800;
  color:rgba(255,255,255,0.9);
  cursor:pointer;
  user-select:none;
}
.cell.disabled{cursor:default;opacity:0.95}
.cell.x { color: #ef4444; }
.cell.o { color: #60a5fa; }
.cell.win { outline: 4px solid rgba(16,185,129,0.12); }

.panel {
  min-width:220px;
  background:rgba(255,255,255,0.01);
  border-radius:10px;
  padding:12px;
  border:1px solid rgba(255,255,255,0.03);
  display:flex;
  gap:12px;
  flex-direction:column;
}
.status {font-weight:700;font-size:0.98rem}

.score {display:flex;gap:10px;justify-content:space-between}
.score .item{padding:8px;border-radius:8px;background:rgba(255,255,255,0.02);font-weight:700}

.btn {padding:8px 10px;border-radius:8px;cursor:pointer;font-weight:700}
.btn.primary{background:linear-gradient(90deg,var(--accent),var(--accent-2));color:#042}
.btn.ghost{border:1px solid rgba(255,255,255,0.04);color:var(--muted)}

@media (max-width:640px){.panel{min-width:unset;width:100%}}