:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  background: #070b14;
  color: #f3f7ff;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: radial-gradient(circle at top, #18284b 0, #070b14 52%); }
main { width: min(980px, calc(100% - 28px)); margin: auto; padding: 34px 0 48px; }
header { margin-bottom: 22px; }
.eyebrow { color: #67e8f9; font-size: .76rem; font-weight: 800; letter-spacing: .18em; }
h1 { margin: 0; font-size: clamp(2.3rem, 7vw, 5.8rem); line-height: .95; letter-spacing: -.055em; }
header > p:last-child { color: #aab8d2; }
.machine { padding: 18px; border: 1px solid #263a62; border-radius: 18px; background: #0c1425; box-shadow: 0 28px 80px #0009; }
canvas { display: block; width: 100%; aspect-ratio: 384 / 272; background: #000; image-rendering: pixelated; border-radius: 8px; }
.controls { display: grid; grid-template-columns: minmax(250px, 1fr) auto auto; gap: 10px; margin-top: 14px; align-items: stretch; }
.rom-picker, button { border: 1px solid #334a73; border-radius: 10px; background: #111e35; color: inherit; }
.rom-picker { display: grid; gap: 3px; padding: 10px 12px; }
.rom-picker span { color: #9caecc; font-size: .78rem; }
.rom-picker input { margin-top: 5px; max-width: 100%; }
button { min-width: 130px; padding: 0 16px; font: inherit; font-weight: 800; cursor: pointer; }
button:hover:not(:disabled) { border-color: #67e8f9; background: #173052; }
button:disabled { cursor: wait; opacity: .55; }
#status { min-height: 1.5em; margin: 12px 0 0; color: #c7d2e7; }
#status[data-tone="ok"] { color: #6ee7b7; }
#status[data-tone="error"] { color: #fca5a5; }
.telemetry { margin: 4px 0 0; color: #7183a2; font: .78rem ui-monospace, monospace; }
.help { margin-top: 24px; padding: 20px; border: 1px solid #1c2d4e; border-radius: 16px; background: #0a1120; }
.keys { display: grid; grid-template-columns: auto 1fr auto 1fr; gap: 8px 12px; align-items: center; }
kbd { min-width: 44px; padding: 7px 10px; border: 1px solid #526b94; border-bottom-width: 3px; border-radius: 7px; background: #1a2942; text-align: center; font-weight: 900; }
footer { margin-top: 20px; color: #788aa9; font-size: .78rem; line-height: 1.6; }
a { color: #67e8f9; }
code { overflow-wrap: anywhere; }
@media (max-width: 720px) {
  .controls { grid-template-columns: 1fr 1fr; }
  .rom-picker { grid-column: 1 / -1; }
}