:root {
  --room: #16181a;
  --ink: #d9dcd6;
  --muted: #9aa09a;
  --panel: #202326;
  --line: #34383b;
  --accent: #e0a458;
  --case: #d8d0bd;
  --case-shadow: #b3aa94;
  --bezel: #2b2825;
  --key: #2e2b28;
  --key-top: #3b3834;
  --key-ink: #efe9dc;
  --led-off: #4a1d10;
  --led-on: #ff5a1f;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--room);
  color: var(--ink);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
}

a { color: var(--accent); }

.top, .foot { max-width: 1400px; margin: 0 auto; padding: 16px; }
.top h1 { font-size: 20px; margin: 0 0 4px; letter-spacing: 0.02em; }
.top p, .foot p { margin: 0; color: var(--muted); font-size: 14px; }

main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 16px 16px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 20px;
  align-items: start;
}

@media (max-width: 1000px) {
  main { grid-template-columns: minmax(0, 1fr); }
}

/* ---- the VT100 ---- */

.terminal { min-width: 0; }

.monitor {
  position: relative;
  background: linear-gradient(180deg, var(--case) 0%, #cfc6b1 100%);
  border-radius: 18px 18px 10px 10px;
  padding: 3.2% 4% 4.5%;
  box-shadow: inset 0 -6px 0 var(--case-shadow), 0 12px 30px rgba(0, 0, 0, 0.5);
}

.bezel {
  background: var(--bezel);
  border-radius: 14px;
  padding: 3%;
  box-shadow: inset 0 0 0 2px #1d1b19, inset 0 6px 14px rgba(0, 0, 0, 0.6);
}

/* a 12-inch 4:3 tube; the 202 x 115 mm raster sits in the middle of it */
.glass {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: 7% / 9%;
  overflow: hidden;
  background: radial-gradient(ellipse at 50% 45%, #0d1011 0%, #070808 70%, #040505 100%);
  box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.9);
}

#screen {
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
  touch-action: manipulation;
}

.glass:focus-within { box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.9), 0 0 0 2px rgba(224, 164, 88, 0.35); }

.status {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 6%;
  margin: 0;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  pointer-events: none;
}

.status:empty { display: none; }

.badge {
  position: absolute;
  right: 5%;
  bottom: 1.2%;
  font: 700 12px/1 Helvetica, Arial, sans-serif;
  letter-spacing: 0.12em;
  color: #6d665a;
}

/* ---- keyboard, laid out from DEC's drawing (972 x 300 units) ---- */

.keyboard {
  position: relative;
  margin-top: 18px;
  aspect-ratio: 972 / 300;
  background: linear-gradient(180deg, #d2c9b4, #c3b9a2);
  border-radius: 10px 10px 16px 16px;
  box-shadow: inset 0 -5px 0 var(--case-shadow), 0 8px 20px rgba(0, 0, 0, 0.45);
  user-select: none;
  -webkit-user-select: none;
  container-type: inline-size;
}

.key {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.1em;
  padding: 0;
  margin: 0;
  border: none;
  border-radius: 6%;
  background: linear-gradient(180deg, var(--key-top), var(--key));
  box-shadow: 0 0.35cqw 0 #141312, inset 0 0.15cqw 0 rgba(255, 255, 255, 0.08);
  color: var(--key-ink);
  font: 600 1.35cqw/1 Helvetica, Arial, sans-serif;
  cursor: pointer;
  touch-action: none;
}

.key.letter { font-size: 1.9cqw; }
.key.word { font-size: 0.95cqw; letter-spacing: 0.02em; }
.key .small { font-size: 0.9cqw; font-weight: 400; opacity: 0.85; }
.key.down { transform: translateY(0.3cqw); box-shadow: 0 0.05cqw 0 #141312; background: var(--key); }
.key.return { clip-path: polygon(33.34% 0, 100% 0, 100% 100%, 0 100%, 0 52.38%, 33.34% 52.38%); justify-content: flex-end; padding-bottom: 1.3cqw; }
.key:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.leds {
  position: absolute;
  background: #bdb39c;
  border-radius: 4px;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.25);
}

.led {
  position: absolute;
  transform: translate(-50%, 0);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25cqw;
  font: 700 0.8cqw/1 Helvetica, Arial, sans-serif;
  color: #3a352c;
  text-align: center;
  white-space: nowrap;
}

.led i {
  display: block;
  width: 1.1cqw;
  height: 1.1cqw;
  border-radius: 50%;
  background: var(--led-off);
  box-shadow: inset 0 0 2px #000;
}

.led.on i { background: var(--led-on); box-shadow: 0 0 1cqw var(--led-on); }

/* ---- side panels ---- */

.side { display: flex; flex-direction: column; gap: 14px; min-width: 0; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
}

.panel h2, .panel summary { font-size: 14px; font-weight: 700; margin: 0; letter-spacing: 0.04em; text-transform: uppercase; }
.panel summary { cursor: pointer; }
.panel h3 { font-size: 14px; margin: 14px 0 4px; }
.panel ol { padding-left: 20px; margin: 4px 0; }
.panel li { margin: 3px 0; }
.panel p { margin: 6px 0; }
.note { color: var(--muted); font-size: 13px; }

.hand { display: flex; gap: 10px; margin-top: 8px; }

.hand button, #power {
  font: 700 13px/1 Helvetica, Arial, sans-serif;
  letter-spacing: 0.08em;
  padding: 12px 14px;
  border-radius: 6px;
  border: 1px solid #111;
  background: linear-gradient(180deg, #55504a, #3b3732);
  color: #f3eee3;
  cursor: pointer;
}

.hand button:active, #power:active { transform: translateY(1px); }
#set-button { background: linear-gradient(180deg, #2f6b3c, #1f4a29); }
.hand button:focus-visible, #power:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.row { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; margin-top: 8px; }
.row label { font-size: 14px; }

.readout { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; margin: 10px 0 6px; font-size: 14px; }
.readout dt { color: var(--muted); }
.readout dd { margin: 0; font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; display: flex; align-items: center; gap: 8px; }
.bar { flex: 1; height: 6px; background: #111; border-radius: 3px; overflow: hidden; }
.bar span { display: block; height: 100%; width: 0; background: var(--accent); }

kbd {
  font: 600 12px/1 ui-monospace, Menlo, Consolas, monospace;
  border: 1px solid #555;
  border-bottom-width: 2px;
  border-radius: 3px;
  padding: 1px 4px;
  background: #2a2d30;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: pre;
}