:root { color-scheme: dark; }
* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: #0a0a0a;
  color: #e5e7eb;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}
#ui { text-align: center; margin: 10px 0 6px; }
#ui h1 { margin: 0; font-size: 28px; }
#ui .sub { margin: 6px 0 0; opacity: .8; font-size: 14px; }
#wrap { width: 100%; display: flex; justify-content: center; align-items: center; position: relative; }
#game {
  background: #000;
  border-radius: 16px;
  border: 2px solid #facc15;
  box-shadow: 0 10px 30px rgba(0,0,0,.4);
  max-width: 95vw;
  height: auto;
}
#mute-indicator {
  position: absolute;
  right: 22px;
  top: 12px;
  font-size: 22px;
  opacity: 0.9;
  background: rgba(0,0,0,.35);
  padding: 4px 8px;
  border-radius: 8px;
  pointer-events: none;
  transition: opacity .25s linear;
}
.hidden { opacity: 0; }