* {
  box-sizing: border-box;
}

:root {
  --bg-1: #eaf1ff;
  --bg-2: #f7faff;
  --card: #ffffff;
  --text: #18233a;
  --muted: #6b7280;
  --line: #d9e3f3;
  --x: #2563eb;
  --o: #dc2626;
  --win: #16a34a;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(145deg, var(--bg-1), var(--bg-2));
  color: var(--text);
}

.app {
  width: min(460px, 92vw);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
  box-shadow: 0 16px 40px rgba(24, 35, 58, 0.1);
  text-align: center;
}

h1 {
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
}

.status {
  margin: 10px 0 16px;
  min-height: 24px;
  color: #334155;
  font-weight: 600;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.cell {
  aspect-ratio: 1;
  border: 1px solid #ccd9ef;
  border-radius: 12px;
  background: #f9fbff;
  font-size: clamp(1.9rem, 8vw, 2.8rem);
  font-weight: 800;
  cursor: pointer;
}

.cell:hover {
  background: #f1f6ff;
}

.cell.x {
  color: var(--x);
}

.cell.o {
  color: var(--o);
}

.cell.win {
  background: #dcfce7;
  border-color: #86efac;
  color: var(--win);
}

.scoreboard {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.scoreboard div {
  border: 1px solid #d9e3f3;
  border-radius: 10px;
  padding: 8px;
  background: #f7faff;
}

.scoreboard strong {
  display: block;
  font-size: 1.3rem;
}

.scoreboard span {
  color: var(--muted);
  font-size: 0.85rem;
}

.actions {
  margin-top: 14px;
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.actions button {
  border: 0;
  border-radius: 10px;
  background: #2563eb;
  color: #fff;
  padding: 9px 12px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

#resetScoreBtn {
  background: #0f766e;
}