* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f0f2f5;
  color: #1a1a1a;
}

main {
  text-align: center;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

#status {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  font-weight: bold;
}

#board {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-template-rows: repeat(3, 100px);
  gap: 10px;
  margin-bottom: 2rem;
}

.cell {
  width: 100px;
  height: 100px;
  background: #fff;
  border: 2px solid #ccc;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  font-weight: bold;
  cursor: pointer;
  border-radius: 8px;
}

.cell:hover {
  background: #e9ecef;
}

#reset {
  font-size: 1.2rem;
  padding: 0.6rem 1.4rem;
  border: 1px solid #ccc;
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
}

#reset:hover {
  background: #e9ecef;
}