*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  body {
    background: rgb(114,144,245);
    font: normal 15pt arial;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
  }  
  header {
    color: white;
    text-align: center;
    font: bold 30pt arial;
    margin-bottom: 20px;
  }
  section {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: white;
    border-radius: 20px;
    padding: 15px;
    width: 90%;       
    max-width: 500px;    
    height: auto;        
    min-height: 600px;   
    box-shadow: 5px 5px 10px rgba(0,0,0,0.26);
  }
  #tabuleiro {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-template-rows: repeat(3, 100px);
    gap: 5px;
    margin: 20px 0;
    width: 100%;
    max-width: 350px; 
  }
.cell {
    border: 2px solid black;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 3rem;  
    cursor: pointer;
    background-color: white;
    width: 100%; 
    height: 100%;
  }
  #container-hist-reset {
    width: 100%; 
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 10px;
    gap: 15px;
  }
  /* A barra azul de histórico */
  #hist {
    background: rgb(133,199,250);
    width: 100%;
    padding: 15px;
    color: white;
    border-radius: 10px;
    font: bold 18px arial;
    box-shadow: 3px 3px 3px rgba(0,0,0,0.2);
    text-align: center;
    box-sizing: border-box;
  }
  /* O botão New Game */
  #reset {
    height: 45px;
    width: 140px;
    background-color: rgb(42,70,151);
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    box-shadow: 2px 2px 5px rgba(0,0,0,0.2);
    color: white;
  }
  #reset:active {
    background-color: #ddd;
    transform: translateY(2px);
  }
  #placar {
    margin: 20px auto;
    width: 80%; 
    text-align: center;
    font-size: 1.5rem;
    font-weight: bold;
    background-color: rgb(42,70,151);
    color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 3px 3px 8px rgba(0,0,0,0.3);
  }
  #res {
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: rgb(106,160,244);
    font: bold 20pt arial;
    padding: 10px;
    color: white;
    margin: 10px auto;
    border-radius: 8px;
    width: 90%;
  }
  footer {
    color: white;
    text-align: center;
    margin-top: 20px;
  }