@import url('https://fonts.googleapis.com/css2?family=Poppins&display=swap');

:root{
  --body-bg:#2e7d32;              
  --panel-bg:#ffffff;
  --panel-shadow:0 10px 36px 16px rgba(0,0,0,.1);
  --grid-border:#1b5e20;
  --btn-bg:#2e7d32;
  --btn-hover:#60ad5e;
  --font:"Poppins",sans-serif;
}

body{
  margin:0;
  font-family:var(--font);
  background:var(--body-bg);
}

section{
  width:400px;
  margin:80px auto;
  text-align:center;
  background:var(--panel-bg);
  border-radius:10px;
  box-shadow:var(--panel-shadow);
  padding-bottom:25px;
}

.game--title{padding-top:20px;margin:0;}

.mode{
  margin:15px auto 5px;
  display:flex;
  justify-content:center;
  gap:1.2rem;
  font-size:0.9rem;
  font-weight:600;
}

.game--container{
  display:grid;
  grid-template-columns:repeat(3,auto);
  width:180px;
  margin:15px auto 10px;
}

.cell{
  width:60px;height:60px;
  line-height:60px;
  font-size:24px;
  font-weight:bold;
  cursor:pointer;
  border:1px solid var(--grid-border);
  user-select:none;
}

button{
  height:32px;
  padding:0 18px;
  border:none;
  border-radius:6px;
  background:var(--btn-bg);
  color:#fff;
  cursor:pointer;
  font-family:var(--font);
}
button:hover{background:var(--btn-hover);transition:.25s;}