/* Reset some default styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  background: linear-gradient(135deg, #74ebd5, #ACB6E5);
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  background-color: #fff;
  padding: 40px 30px;
  border-radius: 15px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.2);
  max-width: 400px;
  width: 100%;
  text-align: center;
  animation: fadeIn 1s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

.title {
  font-size: 2.5em;
  margin-bottom: 20px;
  color: #333;
  font-family: 'Arial Rounded MT Bold', cursive;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

#board {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  gap: 15px;
  justify-content: center;
  margin-bottom: 20px;
}

.cell {
  width: 100px;
  height: 100px;
  background-color: #fafafa;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5em;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  transition: transform 0.2s, box-shadow 0.2s;
}

.cell:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

#message {
  font-size: 1.2em;
  margin-bottom: 15px;
  color: #555;
}

.player {
  font-weight: bold;
  color: #333;
}

.btn {
  padding: 12px 25px;
  font-size: 1em;
  border: none;
  border-radius: 8px;
  background-color: #6a11cb;
  color: #fff;
  cursor: pointer;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: background-color 0.3s, transform 0.2s;
}

.btn:hover {
  background-color: #8e2de2;
  transform: translateY(-2px);
}