/* gitmotive.tech: shared stylesheet. No external fonts, no images beyond the favicon.

   Colour pairs and WCAG contrast ratios (text pairs must be >= 4.5:1):
   dark (default)
     --fg      #d9dee6 on --bg      #131a24   12.94:1
     --fg      #d9dee6 on --panel   #1a2330   11.71:1
     --muted   #8f9aab on --bg      #131a24    6.14:1
     --muted   #8f9aab on --panel   #1a2330    5.56:1
     --accent  #f0b445 on --bg      #131a24    9.43:1
     --accent  #f0b445 on --panel   #1a2330    8.53:1
     --fg      #d9dee6 on --hl      #2e2a1f   10.59:1
     --accent  #f0b445 on --hl      #2e2a1f    7.72:1
     --on-acc  #131a24 on --accent  #f0b445    9.43:1
   light (prefers-color-scheme: light)
     --fg      #18202c on --bg      #f3f5f8   15.00:1
     --fg      #18202c on --panel   #ffffff   16.38:1
     --muted   #556172 on --bg      #f3f5f8    5.76:1
     --muted   #556172 on --panel   #ffffff    6.29:1
     --accent  #8a5800 on --bg      #f3f5f8    5.53:1
     --accent  #8a5800 on --panel   #ffffff    6.04:1
     --fg      #18202c on --hl      #fbedcf   14.13:1
     --accent  #8a5800 on --hl      #fbedcf    5.21:1
     --on-acc  #ffffff on --accent  #8a5800    6.04:1
   --rule is a non-text border colour and is not a text pair. */

:root {
  color-scheme: dark light;
  --bg: #131a24;
  --panel: #1a2330;
  --fg: #d9dee6;
  --muted: #8f9aab;
  --accent: #f0b445;
  --hl: #2e2a1f;
  --on-acc: #131a24;
  --rule: #2c3846;

  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", "Roboto Mono", "DejaVu Sans Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", "Noto Sans", "Helvetica Neue", Arial, sans-serif;

  --measure: 66ch;
  --wide: 72rem;
  --gut: clamp(1rem, 4vw, 2.5rem);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f3f5f8;
    --panel: #ffffff;
    --fg: #18202c;
    --muted: #556172;
    --accent: #8a5800;
    --hl: #fbedcf;
    --on-acc: #ffffff;
    --rule: #d3d9e1;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html {
  background: var(--bg);
  color: var(--fg);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  font: 400 1.0625rem/1.65 var(--sans);
  overflow-wrap: break-word;
}

a { color: var(--accent); text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

code, pre, kbd { font-family: var(--mono); }
:not(pre) > code {
  font-size: 0.9em;
  padding: 0.05em 0.3em;
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: var(--panel);
}

pre {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.6;
  overflow-x: auto;
  tab-size: 4;
}

.skip {
  position: absolute;
  left: var(--gut);
  top: -4rem;
  z-index: 10;
  padding: 0.5rem 0.9rem;
  background: var(--accent);
  color: var(--on-acc);
  font-family: var(--mono);
  text-decoration: none;
}
.skip:focus { top: 0.75rem; }

/* ---- header / footer ---------------------------------------------------------------- */

.bar, .foot {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 1.1rem var(--gut);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: center;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.9375rem;
}
.top { border-bottom: 1px solid var(--rule); }
.bar ul, .foot ul { display: flex; flex-wrap: wrap; gap: 0.25rem 1.5rem; margin: 0; padding: 0; list-style: none; }
.bar a, .foot a { color: var(--fg); text-decoration: none; }
.bar a:hover, .foot a:hover { color: var(--accent); }
.mark { font-weight: 700; letter-spacing: -0.01em; }
.mark-glyph { color: var(--accent); margin-right: 0.4ch; font-weight: 700; }

.foot { border-top: 1px solid var(--rule); color: var(--muted); margin-top: 2rem; padding-block: 2rem 2.5rem; }
.foot p { margin: 0; }

/* ---- layout ------------------------------------------------------------------------- */

main { display: block; }

.hero, .block, .cta {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 var(--gut);
}

/* ---- hero: the tagline is a diff hunk -------------------------------------------------- */

.hero { padding-top: clamp(2.5rem, 8vw, 5.5rem); }

.hunk {
  margin: 0 0 0.6rem;
  font: 0.875rem/1 var(--mono);
  color: var(--muted);
}

.tagline {
  margin: 0;
  font: 650 clamp(1.55rem, 5.2vw, 3.5rem)/1.2 var(--mono);
  letter-spacing: -0.035em;
}
.tagline .ln {
  display: block;
  padding: 0.08em 0.4em 0.08em 1.5ch;
  text-indent: -1.5ch;
  border-left: 3px solid transparent;
}
.tagline .sign {
  display: inline-block;
  width: 1.5ch;
  text-indent: 0;
  text-align: center;
  font-weight: 400;
  color: var(--muted);
}
.tagline .ctx { color: var(--muted); }
.tagline .add {
  background: var(--hl);
  border-left-color: var(--accent);
  width: fit-content;
  max-width: 100%;
}
.tagline .add .sign { color: var(--accent); }

.lede {
  max-width: 56ch;
  margin: 1.75rem 0 0;
  font-size: clamp(1.0625rem, 1.6vw, 1.1875rem);
}

.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.75rem; }

.btn {
  display: inline-block;
  padding: 0.7rem 1.15rem;
  border: 1px solid var(--accent);
  border-radius: 3px;
  background: var(--accent);
  color: var(--on-acc);
  font: 600 0.9375rem/1.2 var(--mono);
  text-decoration: none;
}
.btn:hover { text-decoration: underline; text-decoration-thickness: 1px; }
.btn.ghost { background: transparent; color: var(--fg); border-color: var(--rule); }
.btn.ghost:hover { border-color: var(--accent); }

/* ---- the blame gutter + intent panel ------------------------------------------------- */

.split {
  margin: clamp(2.5rem, 6vw, 4rem) 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--panel);
}
.pane { min-width: 0; }
.pane + .pane { border-left: 1px solid var(--rule); }

.pane-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin: 0;
  padding: 0.55rem 1rem;
  border-bottom: 1px solid var(--rule);
  font: 0.8125rem/1.4 var(--mono);
  color: var(--muted);
}
.pane-head .path { color: var(--fg); }

.pane pre { padding: 0.9rem 0; }
.blame pre code, .intent pre code { display: block; min-width: max-content; }

.row { display: block; padding-right: 1rem; white-space: pre; }
.row .g {
  display: inline-block;
  padding: 0 1ch 0 1rem;
  margin-right: 1ch;
  border-right: 1px solid var(--rule);
  color: var(--muted);
}
.row .h { color: var(--muted); }
.row .n { display: inline-block; width: 3ch; margin-right: 1.5ch; text-align: right; color: var(--muted); }
.row.sel { background: var(--hl); box-shadow: inset 3px 0 0 var(--accent); }
.row.sel .g, .row.sel .n, .row.sel .h { color: var(--accent); }

.intent pre { padding-inline: 1rem; }
.intent .k { color: var(--accent); }
.prompt { color: var(--muted); user-select: none; -webkit-user-select: none; }

.caret {
  display: inline-block;
  width: 0.6em;
  height: 1.1em;
  margin-left: 0.15em;
  vertical-align: -0.2em;
  background: var(--accent);
  opacity: 0;
}

.split figcaption {
  grid-column: 1 / -1;
  padding: 0.6rem 1rem;
  border-top: 1px solid var(--rule);
  font-size: 0.875rem;
  color: var(--muted);
}

/* ---- sections ----------------------------------------------------------------------- */

.block { padding-top: clamp(3.5rem, 9vw, 6rem); }

h2 {
  margin: 0 0 1.25rem;
  font: 650 clamp(1.4rem, 3vw, 1.9rem)/1.25 var(--mono);
  letter-spacing: -0.025em;
}
.hash { color: var(--accent); margin-right: 1ch; font-weight: 400; }

h3 {
  margin: 0 0 0.6rem;
  font: 600 1.0625rem/1.35 var(--mono);
  letter-spacing: -0.01em;
}

.prose { max-width: var(--measure); }
.prose p { margin: 0 0 1rem; }

.diff, .steps pre, .install pre {
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--panel);
  padding: 0.85rem 1rem;
}
.diff { max-width: 52rem; margin-top: 1.5rem; }
.diff code > span { display: block; white-space: pre; }
.d-hunk { color: var(--muted); }
.d-del { color: var(--muted); text-decoration: line-through; text-decoration-color: var(--accent); }
.aside { margin: 1rem 0 0; font-family: var(--mono); color: var(--accent); }

/* a real sequence, so real numbers */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
  counter-reset: step;
}
.steps li { counter-increment: step; min-width: 0; padding-top: 1rem; border-top: 1px solid var(--rule); }
.steps h3::before {
  content: counter(step) ".";
  display: inline-block;
  min-width: 2.5ch;
  color: var(--accent);
}
.steps p { margin: 0.75rem 0 0; color: var(--muted); font-size: 0.975rem; }

.install {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem 2rem;
}
.install > div { min-width: 0; }
.install p { margin: 0.75rem 0 0; color: var(--muted); font-size: 0.975rem; max-width: 60ch; }

.agents-h { margin-top: 2.5rem; }
.agents {
  width: 100%;
  max-width: 40rem;
  border-collapse: collapse;
  font: 0.9375rem/1.4 var(--mono);
}
.agents th, .agents td { text-align: left; padding: 0.55rem 1rem 0.55rem 0; border-bottom: 1px solid var(--rule); }
.agents thead th { color: var(--muted); font-weight: 400; }
.agents tbody th { font-weight: 600; }
.agents code { border: 0; background: none; padding: 0; }
table.fields { max-width: 52rem; }
table.fields td:last-child { font-family: var(--sans); color: var(--muted); }

nav.toc {
  margin: 1.5rem 0 0;
  padding: 0.85rem 1rem;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  background: var(--panel);
  max-width: 40rem;
}
nav.toc h2 { margin: 0; font: 0.8125rem/1.5 var(--mono); color: var(--muted); }
nav.toc ol { margin: 0.5rem 0 0; padding-left: 2.5ch; font: 0.9375rem/1.7 var(--mono); }
nav.toc ol ol { margin: 0; }
.exp { color: var(--accent); }
.note { margin: 0.75rem 0 0; color: var(--muted); font-size: 0.9375rem; max-width: 60ch; }

.facts {
  max-width: 52rem;
  margin: 0;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--panel);
  padding: 0.85rem 1rem;
  font: 0.9375rem/1.6 var(--mono);
}
.facts div {
  display: grid;
  grid-template-columns: 15ch minmax(0, 1fr);
  gap: 0 1ch;
  min-width: 0;
}
.facts div + div { margin-top: 0.5rem; }
.facts dt { color: var(--accent); }
.facts dt::before { content: "  "; white-space: pre; }
.facts dd { margin: 0; color: var(--fg); }
.facts dd code { font: inherit; }

.cta {
  margin-top: clamp(4rem, 10vw, 7rem);
  padding-block: clamp(2.5rem, 6vw, 3.5rem);
  border-top: 1px solid var(--rule);
}
.cta h2 { margin-bottom: 0.75rem; }
.cta p { margin: 0; max-width: 56ch; }

/* ---- 404 ---------------------------------------------------------------------------- */

.lost { max-width: var(--wide); margin: 0 auto; padding: clamp(3rem, 10vw, 7rem) var(--gut) 2rem; }
.lost h1 { margin: 0; font: 650 clamp(1.6rem, 4vw, 2.4rem)/1.2 var(--mono); letter-spacing: -0.03em; }
.lost pre {
  max-width: 44rem;
  margin-top: 1.5rem;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--panel);
  padding: 0.85rem 1rem;
}
.lost .err { color: var(--accent); }
.lost p { max-width: var(--measure); }

/* ---- responsive --------------------------------------------------------------------- */

@media (max-width: 56rem) {
  .split { grid-template-columns: minmax(0, 1fr); }
  .pane + .pane { border-left: 0; border-top: 1px solid var(--rule); }
  .steps { grid-template-columns: minmax(0, 1fr); }
  .install { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 30rem) {
  .row .g { padding-left: 0.75rem; }
  .row .g .a { display: none; }
  .bar { justify-content: flex-start; }
  .facts div { grid-template-columns: minmax(0, 1fr); }
  .facts dt::before { content: none; }
  .facts div + div { margin-top: 0.75rem; }
}

/* ---- motion: one blink of the caret after the hero command, then still --------------- */

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
  .caret { animation: caret 1.05s steps(1, end) 0.6s 5 forwards; }
  @keyframes caret {
    0% { opacity: 1; }
    50% { opacity: 0; }
    100% { opacity: 1; }
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .caret { opacity: 1; }
}