:root { color-scheme: dark; }
* { box-sizing: border-box; }
body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden; /* これが重要：スクロールバーを非表示にし，スクロールを禁止する */
    touch-action: none; /* スマホなどでのタッチ操作によるスクロールも防ぐ */
}
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans JP", sans-serif;
  background: #111827;
  color: #e5e7eb;
}
.wrap {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 12px;
  padding: 16px;
  max-width: 100vw;
  margin: 0 auto;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
h1 { margin: 0; font-size: 1.25rem; }
.badge {
  padding: 4px 10px;
  border-radius: 999px;
  background: #1f2937;
  border: 1px solid #374151;
  font-size: .85rem;
}
main {
  margin: 0 auto;
  gap: 12px;
  min-height: 100vh;
  display: flex;
  place-items: center;
}
@media (max-width: 900px) { main { grid-template-columns: 1fr; } }
.game-panel {
  background: #0b1220;
  border: 1px solid #334155;
  border-radius: 12px;
  padding: 12px;
  min-height: 420px;
  align-self: start;
}
#game-container {
  width: 1200px;
  height: 852px;
  aspect-ratio: 16 / 9;
  place-items: center;
  border: 1px dashed #475569;
  border-radius: 8px;
  color: #94a3b8;
}
#can {
  border-radius: 8px;
}
.info {
  background: #0f172a;
  border: 1px solid #334155;
  border-radius: 12px;
  padding: 12px;
  align-self: start;
}
.info h2 { 
  margin: 0 0 8px; 
  font-size: 1rem;
}
.keys {
  padding: 2px 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: #f9fafb;
}
footer {
  font-size: .85rem;
  color: #94a3b8;
  text-align: center;
}