@font-face {
  font-family: 'Geist Mono';
  src: url('assets/geist-mono.woff') format('woff');
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

:root {
  color-scheme: dark;
  font: 400 18px/1.5 'Geist Mono', ui-monospace, monospace;
  font-synthesis: none;
  font-variant-ligatures: none;
  --row: 1.5rem;
  --paper: #11110f;
  --ink: #eeede8;
  --accent: #e0ce41;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--paper); color: var(--ink); }
h1, h2, p, figure, dl, dd { margin: 0; font: inherit; }
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
::selection { color: var(--paper); background: var(--accent); }

/* One fold: two text rows between brand/intro and actions/screenshot.
   The 16:10 capture sets the column width when viewport height is the limit. */
.page, .chapter {
  width: min(120ch, calc(100% - 8ch), max(38ch, calc((100svh - 17.5rem) * 1.6)));
  margin-inline: auto;
}
.page {
  height: 100vh;
  height: 100svh;
  padding-block: var(--row);
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
}
.brand { padding-bottom: calc(2 * var(--row)); }
.brand span { color: var(--accent); }
.intro { padding-bottom: calc(2 * var(--row)); }
.actions { display: flex; flex-wrap: wrap; gap: 2ch; margin-top: var(--row); }
.actions a { display: inline-block; padding: .5em 1ch; white-space: nowrap; }
.install { color: var(--paper); background: var(--ink); }
.install:hover { background: var(--accent); }
.source:hover { color: var(--accent); }
.screen { min-width: 0; min-height: 0; container-type: inline-size; }
.screen img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: left top;
}

/* Two short chapters use the same text cells and column edges as the hero. */
.chapter {
  display: grid;
  grid-template-columns: minmax(20ch, 1fr) minmax(0, 2fr);
  gap: calc(2 * var(--row)) 6ch;
  padding-block: calc(4 * var(--row));
  border-top: 1px solid #30302c;
}
.chapter h2 { color: var(--accent); }
.chapter-copy { display: grid; gap: var(--row); }
.chapter-copy a { text-decoration: underline; text-underline-offset: .2em; }
.chapter-copy a:hover { color: var(--accent); }
.metrics { display: grid; gap: var(--row); }
.metrics > div { display: flex; justify-content: space-between; gap: 2ch; }
.metrics dt { color: #a5a59c; }
.metrics dd { white-space: nowrap; }
@media (max-width: 900px), (max-height: 650px) {
  .chapter { grid-template-columns: minmax(0, 1fr); }
}

/* The OS illustration has its own fixed terminal cell grid. */
.os-demo {
  position: relative;
  width: 100%;
  height: min(100%, 62.5cqw);
  aspect-ratio: 8 / 5;
  overflow: hidden;
  background: #0c0c0c;
  color: #d8d8d1;
  border: 1px solid #30302c;
  font-size: 1.25cqw;
  line-height: 1.5;
}
.os-demo p, .os-demo pre { margin: 0; font: inherit; }
.demo-boot, .demo-workspace, .demo-browser {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity .28s ease, visibility .28s;
}
[data-scene="boot"] .demo-boot,
[data-scene="work"] .demo-workspace,
[data-scene="browser"] .demo-browser { opacity: 1; visibility: visible; }
.demo-boot { display: grid; place-content: center; justify-items: center; gap: 3em; }
.demo-boot pre { color: var(--accent); font-size: 1.4em; }
.demo-boot p { color: #93938b; }
.demo-workspace { display: grid; grid-template-rows: minmax(0, 1fr) 1.8em; }
.demo-panes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: .65em;
  padding: .65em;
  min-height: 0;
}
.pane { border: 1px solid #353532; min-width: 0; min-height: 0; overflow: hidden; }
.pane-main { grid-row: 1 / 3; border-color: #8f8237; }
.pane-title {
  display: flex;
  justify-content: space-between;
  gap: 2ch;
  padding: .35em 1ch;
  color: #99998f;
  border-bottom: 1px solid #272723;
  white-space: nowrap;
}
.pane-title span { overflow: hidden; text-overflow: ellipsis; }
.pane-title span:first-child { flex-shrink: 0; }
.pane-main .pane-title { color: var(--accent); }
.terminal-content { padding: 1.25em 1.5ch; }
.os-demo .agent-name { margin-bottom: 2.5em; color: #ededeb; }
.prompt { color: #f0efe9; min-height: 3em; }
.os-demo .terminal-line { margin-top: .8em; opacity: 0; transform: translateY(.3em); transition: opacity .24s, transform .24s; }
.os-demo .terminal-line.visible { opacity: 1; transform: none; }
.os-demo .muted { color: #909088; }
.os-demo .success { color: #b4ca85; }
.os-demo .follow-up { margin-top: 3em; visibility: hidden; }
.os-demo .follow-up.visible { visibility: visible; }
.cursor { color: var(--accent); animation: cursor-blink 1s steps(1) infinite; }
[data-caret] { visibility: hidden; }
[data-caret].caret-active { visibility: visible; }
.demo-status { display: flex; justify-content: space-between; gap: 2ch; align-items: center; padding: 0 4.5em 0 1ch; background: #d2d3c7; color: #1e2117; white-space: nowrap; }
.demo-status b { font-weight: 400; background: #b4ca85; }
.demo-browser { background: #eeede5; color: #25291f; }
.browser-toolbar { display: flex; align-items: center; gap: 2ch; padding: .65em 1.5ch; background: #22231f; color: #b4b6ab; }
.address { flex: 1; padding: .3em 1.5ch; background: #33352e; color: #eeede5; }
.orbit-page { height: calc(100% - 3.4em); display: flex; flex-direction: column; padding: 2em 4ch; }
.orbit-page header { display: flex; justify-content: space-between; gap: 2ch; }
.orbit-page header span:last-child { color: #74796a; }
.orbit-hero { flex: 1; display: grid; align-content: center; justify-items: center; gap: 1.5em; }
.orbit-hero pre { color: #707c51; line-height: 1.2; }
.orbit-play { padding: .65em 2ch; background: #273022; color: #eeede5; }
.orbit-page footer { text-align: center; color: #74796a; }
.demo-shortcut { position: absolute; top: 1em; right: 2ch; padding: .45em 1ch; background: #e0ce41; color: #151711; }
.demo-motion { position: absolute; right: 0; bottom: 0; width: 3.2em; height: 1.8em; min-width: 28px; min-height: 28px; padding: 0; border: 0; font: inherit; font-size: max(12px, 1em); background: transparent; color: #25291f; cursor: pointer; }
[data-scene="boot"] .demo-motion { color: var(--ink); }
.demo-motion:hover { background: #e0ce41; color: #151711; }
.demo-motion:focus-visible { outline: 2px solid var(--accent); outline-offset: -3px; }
.motion-paused .cursor { animation-play-state: paused; }
@keyframes cursor-blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
  .os-demo *, .os-demo *::before, .os-demo *::after { animation: none; transition: none; }
}

@media (max-width: 600px) {
  :root { font-size: 14px; }
  .page, .chapter { width: calc(100% - 4ch); }
  .chapter { grid-template-columns: minmax(0, 1fr); padding-block: calc(3 * var(--row)); }
  .actions { gap: 1ch; }
}
@media (max-height: 600px) {
  :root { font-size: 14px; }
  .page, .chapter {
    width: min(120ch, calc(100% - 4ch), max(38ch, calc((100svh - 12.25rem) * 1.6)));
  }
  .page {
    padding-block: calc(var(--row) / 2);
  }
  .brand { padding-bottom: var(--row); }
  .intro { padding-bottom: var(--row); }
  .actions { gap: 1ch; margin-top: calc(var(--row) / 2); }
}
/* At extreme text zoom, let content remain reachable rather than clipping it. */
@media (max-height: 320px) {
  .page { height: auto; min-height: 100svh; }
  .screen { aspect-ratio: 8 / 5; }
}