:root {
  --page: #0d1412;
  --panel: #151f1c;
  --panel-2: #1b2824;
  --line: #2d4039;
  --text: #eef5ef;
  --muted: #9bb0a5;
  --green: #b8ffca;
  --green-dim: #75a982;
  --lcd: #c6d3a4;
  --ink: #172519;
  --axis: #66765b;
  --accent: #74e49b;
  --danger: #ff9b8f;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 70% -10%, rgba(64, 139, 93, .22), transparent 38rem),
    var(--page);
  color: var(--text);
  font: 15px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
main { width: min(1120px, 100%); margin: 0 auto; padding: 3rem 1.25rem 5rem; }
header { max-width: 790px; }
.eyebrow { margin: 0 0 .35rem; color: var(--accent); font: 700 .73rem/1 ui-monospace, monospace; letter-spacing: .14em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(2rem, 5vw, 3.5rem); line-height: 1.05; letter-spacing: -.035em; }
h2 { margin: 0 0 .75rem; font-size: .78rem; color: var(--muted); letter-spacing: .09em; text-transform: uppercase; }
.lede { color: var(--muted); max-width: 72ch; margin: 1rem 0 0; }
a { color: var(--green); }
code, output { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

.presets { display: flex; flex-wrap: wrap; gap: .55rem; margin: 2rem 0 1rem; }
button, input { font: inherit; }
.preset, #play {
  border: 1px solid var(--line); background: var(--panel); color: var(--muted);
  border-radius: 999px; padding: .52rem .9rem; cursor: pointer;
}
.preset:hover, .preset.active, #play:hover { color: var(--text); border-color: var(--accent); }
.preset.active { background: rgba(116, 228, 155, .12); }

.workbench { display: grid; grid-template-columns: 245px minmax(0, 1fr); gap: 1rem; align-items: stretch; }
.controls, .display-column, .inspection > div {
  border: 1px solid var(--line); background: rgba(21, 31, 28, .92); border-radius: 16px;
}
.controls { padding: 1.15rem; }
.controls h2:not(:first-child) { margin-top: 1.3rem; }
.number-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .65rem; }
.number-grid.three { grid-template-columns: 1fr; }
label { display: grid; gap: .25rem; color: var(--muted); font-size: .78rem; }
input[type="number"] {
  min-width: 0; width: 100%; border: 1px solid var(--line); border-radius: 7px;
  padding: .42rem .5rem; background: var(--page); color: var(--text);
}
input:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.range-label { margin-top: 1rem; }
.range-label span { display: flex; justify-content: space-between; }
input[type="range"] { accent-color: var(--accent); width: 100%; }
.check { display: flex; align-items: center; gap: .5rem; margin: .55rem 0; }
.error { min-height: 1.3em; margin: .8rem 0 0; color: var(--danger); font-size: .78rem; }

.display-column { min-width: 0; padding: 1rem; display: flex; flex-direction: column; }
.lcd-shell { width: 100%; overflow: auto; border-radius: 12px; background: #29312d; padding: .8rem .8rem 1rem; }
.lcd-label { display: flex; justify-content: space-between; color: #aab4ae; font: 700 .68rem/1 ui-monospace, monospace; letter-spacing: .08em; margin-bottom: .65rem; }
#screen { display: block; margin: 0 auto; background: var(--lcd); image-rendering: pixelated; max-width: none; cursor: crosshair; }
.timeline { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: .75rem; align-items: center; margin-top: .85rem; }
#play { border-radius: 8px; padding: .35rem .62rem; }
#timeline-output { color: var(--muted); font-size: .75rem; min-width: 7ch; text-align: right; }
.cursor-readout { color: var(--muted); font: .78rem/1.4 ui-monospace, monospace; margin: .7rem 0 0; }

.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: .75rem; margin: .9rem 0; }
.metrics article { border: 1px solid var(--line); background: var(--panel); border-radius: 12px; padding: .8rem 1rem; }
.metrics span { display: block; color: var(--muted); font-size: .72rem; text-transform: uppercase; letter-spacing: .07em; }
.metrics strong { display: block; font: 600 1.45rem/1.3 ui-monospace, monospace; color: var(--green); }

.inspection { display: grid; grid-template-columns: 1fr 1fr; gap: .9rem; }
.inspection > div { padding: 1rem 1.15rem; }
.inspection p { color: var(--muted); margin: 0; }
.inspection .boundary { margin-top: .75rem; font-size: .82rem; }
dl { display: grid; grid-template-columns: max-content 1fr; gap: .35rem .9rem; margin: 0; font: .82rem/1.4 ui-monospace, monospace; }
dt { color: var(--muted); } dd { margin: 0; overflow-wrap: anywhere; }

@media (max-width: 760px) {
  main { padding-top: 2rem; }
  .workbench, .inspection { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: 1fr 1fr; }
  #screen { width: 100%; height: auto; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
}