:root {
  --azul-claro: #e0f0ff;
  --azul-medio: #4a90e2;
  --azul-escuro: #2c3e50;
  --azul-hover: #357ABD;
  --texto: #ffffff;
  --borda: #dce6f0;
}

body {
  background-color: var(--azul-claro);
  font-family:impact,'Helvetica Neue', sans-serif;
  text-align: center;
  margin: 0;
  padding: 0;
}

h1 {
  color: var(--azul-escuro);
  font-size: 40px;
  margin: 30px 0 10px;
}

#placar {
  font-size: 18px;
  color: var(--azul-escuro);
  margin-bottom: 0px;
  font-family:'lucida sans', impact;
}

#vezDoJogador {
  font-size: 20px;
  margin-bottom: 25px;
  color: var(--azul-medio);
  font-weight:bl;
  font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
}

.tabuleiro {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  gap: 10px;
  justify-content: center;
  margin: 0 auto 30px;
}

.celula {
  width: 100px;
  height: 100px;
  background-color: var(--texto);
  border: 2px solid var(--borda);
  font-size: 2.5em;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.3s;
  border-radius: 10px;
}

.celula:hover {
  background-color: #f0f8ff;
}

.vencedor {
  background-color: #a4d4ff;
}

#mensagem {
  font-size: 22px;
  color: var(--azul-escuro);
  margin-bottom: 20px;
  height: 30px;
}

#reiniciar {
  background: linear-gradient(to right, var(--azul-medio), var(--azul-hover));
  color: var(--texto);
  padding: 12px 25px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s, box-shadow 0.2s;
}

#reiniciar:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.25);
}

#reiniciar:active {
  transform: scale(0.98);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}