:root {
  --bg: #0d1117;
  --panel: #161b22;
  --fg: #c9d1d9;
  --muted: #8b949e;
  --accent: #3fb950;
  --border: #30363d;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
}

.wrap {
  max-width: 940px;
  margin: 0 auto;
  padding: 24px 16px 48px;
  text-align: center;
}

h1 {
  margin: 0 0 4px;
  font-size: 1.9rem;
  letter-spacing: 1px;
}

h1::before { content: "# "; color: var(--accent); }

.sub {
  margin: 0 0 18px;
  color: var(--muted);
}

.stage {
  position: relative;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: #07090d;
  box-shadow: 0 10px 30px rgba(0,0,0,.45);
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: pixelated;
  touch-action: none;
}

.pad {
  display: none;
  gap: 10px;
  justify-content: center;
  margin-top: 14px;
}

.btn {
  background: var(--panel);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 10px;
  font: inherit;
  font-size: 1.2rem;
  padding: 14px 20px;
  min-width: 64px;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.btn:active { background: var(--accent); color: #07090d; }
.btn.jump { flex: 1; max-width: 220px; }

.help {
  margin-top: 18px;
  color: var(--muted);
  font-size: .9rem;
  line-height: 1.7;
}

kbd {
  background: var(--panel);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 1px 6px;
  font-size: .82rem;
  color: var(--fg);
}

.back { margin-top: 22px; }
.back a { color: var(--accent); text-decoration: none; }
.back a:hover { text-decoration: underline; }

@media (hover: none) and (pointer: coarse) {
  .pad { display: flex; }
}