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

:root{
  --bg:#ffffff;
  --fg:#111111;
  --muted:#8a8a8a;
  --line:#e5e5e5;
}

html,body{height:100%}

body{
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);
  color:var(--fg);
  display:flex;
  align-items:center;
  justify-content:center;
}

main{
  text-align:center;
  padding:24px;
}

.code{
  font-size:clamp(96px,22vw,200px);
  font-weight:800;
  line-height:1;
  letter-spacing:-.05em;
  color:var(--fg);
}

.msg{
  margin-top:8px;
  font-size:clamp(13px,2.2vw,16px);
  letter-spacing:.3em;
  text-transform:uppercase;
  color:var(--muted);
}

/* the game */
.game{
  display:block;
  width:min(600px,92vw);
  aspect-ratio:600/150;
  margin:40px auto 0;
  border-top:1px solid var(--line);
  touch-action:manipulation;
  cursor:pointer;
  -webkit-tap-highlight-color:transparent;
}

.hint{
  margin-top:12px;
  font-size:12px;
  color:var(--muted);
}