* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  color: black;
  text-align: center;
  background: linear-gradient(to bottom, #87ceeb, white);
  background-repeat: no-repeat;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

h1 {
  font-size: 62px;
  /* font-weight: 700; */
  margin-bottom: 50px;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .board {
    grid-template-columns: repeat(3, 120px);
    grid-template-rows: repeat(3, 120px);
  }
  .cell {
    font-size: 64px;
  }
  h1 {
    font-size: 40px;
  }
}

@media (max-width: 600px) {
  body {
    padding: 10px;
    height: auto;
    min-height: 100vh;
    flex-direction: column;
  }
  .board {
    grid-template-columns: repeat(3, 80px);
    grid-template-rows: repeat(3, 80px);
    margin-bottom: 30px;
  }
  .cell {
    font-size: 36px;
  }
  h1 {
    font-size: 28px;
    margin-bottom: 20px;
  }
  #status {
    font-size: 18px;
  }
  #resetBtn {
    font-size: 16px;
    padding: 10px 18px;
  }
}


.board {
  background-color: white;
  display: grid;
  grid-template-columns: repeat(3, 120px);
  grid-template-rows: repeat(3, 120px);
  border: 4px solid #333;
  gap: 0;
  border-radius: 12px;
  margin-bottom: 40px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.cell {
  font-size: 64px;
  font-weight: bold;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  user-select: none;
  transition: background-color 0.3s ease;
}

.cell:hover {
  background-color: #f0f0f0;
}

.cell:not(:nth-child(3n)) {
  border-right: 3px solid #333;
}

.cell:nth-child(-n + 6):not(:nth-child(n + 7)) {
  border-bottom: 3px solid #333;
}

#status {
  font-size: 32px;
  margin-bottom: 20px;
  font-weight: 600;
}

#resetBtn {
  padding: 15px 30px;
  font-size: 20px;
  cursor: pointer;
  background-color: #333;
  color: white;
  border: 2px solid white;
  border-radius: 6px;
  transition: background-color 0.3s ease;
}

#resetBtn:hover {
  background-color: #555;
}