* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(#6fd3ff, #d7f7ff);
  color: #102026;
}
#hud {
  position: fixed;
  top: 12px;
  left: 12px;
  right: 12px;
  display: flex;
  justify-content: space-between;
  font-size: 24px;
  font-weight: 700;
  pointer-events: none;
  z-index: 2;
}
#game {
  display: block;
  margin: 0 auto;
  width: min(100vw, 1200px);
  height: auto;
  border: 2px solid #1b3a47;
  background: #b5ecff;
}
#deathScreen {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  display: grid;
  place-items: center;
  z-index: 4;
}
.panel {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  width: min(92vw, 460px);
}
.hidden { display: none !important; }
button, input {
  font-size: 16px;
  padding: 8px 10px;
  margin-top: 8px;
}
ol { padding-left: 22px; }

.heart {
  display: inline-block;
  margin-right: 2px;
}
.heart-active { color: #e02424; }
.heart-lost { color: #111; }