:root {
  --sea-deep: #12325a;
  --sky: #59b3f0;
  --ink: #1a1a2e;
  --paper: #f4f8fc;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--sea-deep);
  color: var(--paper);
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}

.stage {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 12px;
}

canvas {
  display: block;
  width: 100%;
  max-width: 960px;
  height: auto;
  aspect-ratio: 16 / 9;
  background: var(--sky);
  border: 4px solid var(--ink);
  border-radius: 10px;
  box-shadow: 0 8px 0 var(--ink);
  touch-action: none;
}

.hint {
  margin: 0;
  font-size: 0.95rem;
  text-align: center;
  line-height: 1.7;
}

kbd {
  display: inline-block;
  min-width: 1.8em;
  padding: 1px 7px;
  font: inherit;
  font-weight: 700;
  text-align: center;
  color: var(--ink);
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 6px;
  box-shadow: 0 2px 0 var(--ink);
}