:root {
  color-scheme: dark;
  --line: #213650;
  --text: #e9f2ff;
  --dim: #8fa7c4;
  --cyan: #61e6ff;
  --gold: #ffd34d;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  background:
    radial-gradient(ellipse at 50% -10%, rgba(38, 94, 160, .4), transparent 60%),
    linear-gradient(#05080e, #02040a 70%);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 22px;
  border-bottom: 1px solid rgba(33, 54, 80, .65);
}
.back { color: var(--cyan); text-decoration: none; font-size: 13px; white-space: nowrap; }
.tag { color: var(--dim); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; text-align: right; }
main {
  width: min(1000px, 100%);
  margin: 0 auto;
  padding: 18px;
}
#screen {
  position: relative;
  overflow: hidden;
  border: 1px solid #2a405e;
  border-radius: 12px;
  background: #000;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .65);
}
canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  image-rendering: pixelated;
  outline: none;
  background: #000;
}
#boot[hidden] { display: none; }
#boot {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 26px;
  text-align: center;
  background: rgba(3, 7, 14, .78);
  backdrop-filter: blur(2px);
}
#boot h1 { margin: 0; }
#boot h1 img {
  width: min(360px, 58vw);
  height: auto;
  image-rendering: pixelated;
  filter: drop-shadow(0 8px 20px rgba(255, 180, 40, .2));
}
#boot p { margin: 0; max-width: 560px; color: var(--dim); font-size: 13px; line-height: 1.6; }
#boot .hint { font-size: 12px; }
#boot button {
  border: 1px solid #8c6b1d;
  background: linear-gradient(#1c2431, #0e1622);
  color: var(--gold);
  border-radius: 8px;
  padding: 11px 20px;
  font: 600 14px/1.2 "Segoe UI", system-ui, sans-serif;
  letter-spacing: .06em;
  cursor: pointer;
}
#boot button:hover { border-color: var(--gold); }
.err {
  color: #ffb4b8;
  border: 1px solid #5b2e35;
  background: #1a0e12;
  border-radius: 8px;
  padding: 9px 12px;
  max-width: 620px;
}
#error {
  position: absolute;
  inset: auto 18px 18px;
  z-index: 3;
  color: #ffb4b8;
  border: 1px solid #5b2e35;
  background: rgba(26, 14, 18, .96);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 12px;
}
.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 12px;
  color: var(--dim);
  font-size: 12px;
}
.buttons { display: flex; gap: 8px; flex-wrap: wrap; }
.buttons button {
  border: 1px solid var(--line);
  background: #0d1524;
  color: var(--text);
  border-radius: 7px;
  padding: 7px 11px;
  font-size: 11px;
  letter-spacing: .06em;
  text-transform: uppercase;
  cursor: pointer;
}
.buttons button:hover:not(:disabled) { border-color: #4b7aa6; }
.buttons button:disabled { opacity: .45; cursor: default; }
.notes {
  margin-top: 18px;
  border: 1px solid var(--line);
  background: rgba(10, 18, 30, .7);
  border-radius: 10px;
  padding: 12px 16px;
  color: var(--dim);
  font-size: 13px;
  line-height: 1.65;
}
.notes summary { cursor: pointer; color: var(--cyan); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
.notes h2 { color: var(--text); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; margin: 18px 0 6px; }
.notes a { color: #8fc7ef; }
.notes table { width: 100%; border-collapse: collapse; margin: 6px 0; }
.notes th, .notes td { text-align: left; padding: 5px 8px; border-bottom: 1px solid rgba(33, 54, 80, .5); }
.notes th { color: var(--text); font-weight: 600; }
kbd {
  border: 1px solid #314b69;
  border-bottom-width: 2px;
  border-radius: 5px;
  background: #101d2e;
  color: #dcebff;
  padding: 2px 6px;
  font: 11px/1.4 "Cascadia Mono", Consolas, monospace;
}
@media (max-width: 640px) {
  .tag { display: none; }
  main { padding: 10px; }
}