:root {
  color-scheme: only light;
  --bg-top: #d7f0a0;
  --bg-bottom: #6b9f52;
  --panel: #223056;
  --panel-border: #f7ef9d;
  --screen: #13202f;
  --text: #fff8de;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Courier New", monospace;
  background:
    radial-gradient(circle at top, rgba(255, 252, 204, 0.7), transparent 34%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  color: var(--text);
}

.shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  gap: 20px;
}

.masthead {
  text-align: center;
  display: grid;
  gap: 12px;
  justify-items: center;
}

.masthead h1 {
  margin: 0;
  font-size: clamp(1.4rem, 4vw, 2.4rem);
  line-height: 1.3;
  color: #173321;
  text-shadow: 3px 3px 0 #f3ffd0;
}

.eyebrow {
  margin: 0;
  font-size: 0.7rem;
  color: #32512b;
}

#start-btn {
  border: 4px solid #173321;
  background: #f7ef9d;
  color: #173321;
  font: inherit;
  padding: 14px 18px;
  cursor: pointer;
  box-shadow: 0 8px 0 rgba(23, 51, 33, 0.35);
}

#start-btn:active {
  transform: translateY(3px);
  box-shadow: 0 5px 0 rgba(23, 51, 33, 0.35);
}

#game {
  width: min(96vw, 768px);
  height: auto;
  border: 8px solid var(--panel-border);
  background: var(--screen);
  image-rendering: pixelated;
  box-shadow: 0 18px 50px rgba(18, 42, 28, 0.4);
}

@media (max-width: 720px) {
  .shell {
    padding: 16px;
  }

  .masthead {
    gap: 10px;
  }

  #start-btn {
    font-size: 0.7rem;
    padding: 12px 14px;
  }
}