/* robolibs — flat, hard-edged, one accent. No cards, no rounded corners, no soft fills: those
   read as a template, and this isn't one. The accent is the org mark's own amber, used sparingly
   and only where it means something (a link, the current page, a rule that matters). */

:root {
  --paper: #fbfaf7;
  --ink: #161511;
  --ink-dim: #625d4e;
  --line: #161511;
  --line-soft: #d8d2c0;
  --amber: #f3ac25;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --sans: "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html, body { background: var(--paper); }

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
}

a { color: var(--ink); text-decoration: underline; text-decoration-color: var(--line-soft); text-underline-offset: 3px; }
a:hover { color: var(--amber); text-decoration-color: var(--amber); }

code, pre { font-family: var(--mono); font-size: 0.88em; }
pre {
  background: transparent;
  border: 1px solid var(--line);
  padding: 14px 16px;
  overflow-x: auto;
}
:not(pre) > code {
  background: var(--line-soft);
  padding: 0.05em 0.35em;
}

/* ---------------------------------------------------------------------------------- top bar */

.top {
  border-bottom: 2px solid var(--line);
}
.bar {
  max-width: 1080px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  gap: 36px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--ink);
  text-decoration: none;
}
.brand .mark { display: block; }
.bar nav { display: flex; gap: 24px; flex: 1; flex-wrap: wrap; font-family: var(--mono); }
.bar nav a {
  color: var(--ink-dim);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}
.bar nav a:hover { color: var(--ink); }
.bar nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--amber); }
.ghost a { color: var(--ink-dim); font-size: 0.82rem; font-family: var(--mono); text-decoration: none; }
.ghost a:hover { color: var(--amber); }

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

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 48px 24px 96px;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 48px;
  align-items: start;
}
.wrap.wide { grid-template-columns: 1fr; }

aside {
  position: sticky;
  top: 48px;
}
aside h5 {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  font-weight: 500;
}
aside ul { list-style: none; margin: 0; padding: 0; }
aside li a {
  display: block;
  padding: 5px 0 5px 12px;
  border-left: 2px solid var(--line-soft);
  color: var(--ink-dim);
  font-size: 0.88rem;
  text-decoration: none;
}
aside li a:hover { color: var(--ink); border-left-color: var(--ink); }
aside li a[aria-current="page"] { color: var(--ink); border-left-color: var(--amber); font-weight: 600; }

main h1 {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 2.4rem;
  line-height: 1.1;
  margin: 0 0 10px;
  letter-spacing: -0.015em;
}
main .lede {
  font-size: 1.1rem;
  color: var(--ink-dim);
  max-width: 62ch;
  margin: 0 0 40px;
}
main h2 {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 48px 0 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--line);
}
main p { max-width: 68ch; }
main ul.plain { list-style: none; margin: 0; padding: 0; max-width: 70ch; }
main ul.plain li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}
main ul.plain li:last-child { border-bottom: 0; }
main ul.plain li::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  background: var(--amber);
  margin-right: 10px;
  vertical-align: middle;
}

/* ---------------------------------------------------------------------------------- tables */

.tw { overflow-x: auto; margin: 20px 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
th {
  text-align: left;
  font-family: var(--mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  color: var(--ink-dim);
  padding: 10px 20px 10px 0;
  border-bottom: 2px solid var(--line);
}
td { padding: 12px 20px 12px 0; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
td b { font-family: var(--mono); font-weight: 600; }
.dim { color: var(--ink-dim); font-style: italic; font-size: 0.9em; }
.wrap-ok { max-width: 34ch; display: inline-block; }


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

.foot { border-top: 2px solid var(--line); }
.foot .in {
  max-width: 1080px;
  margin: 0 auto;
  padding: 22px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: center;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-dim);
}
.foot .in a { color: var(--ink-dim); text-decoration: none; }
.foot .in a:hover { color: var(--amber); }

/* ---------------------------------------------------------------------------------- diagram */

.diagram {
  border: 2px solid var(--line);
  margin: 20px 0 32px;
  overflow-x: auto;
}
.diagram header {
  display: flex;
  justify-content: space-between;
  padding: 8px 16px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-dim);
}
.diagram .body { padding: 16px; }

svg.graph { display: block; margin: 0 auto; font-family: var(--mono); }
svg.graph .edge { stroke: var(--ink-dim); stroke-width: 1.2; }
svg.graph marker path { fill: var(--ink-dim); }
svg.graph .node circle {
  fill: var(--paper);
  stroke: var(--ink);
  stroke-width: 1.6;
}
svg.graph .node circle.foundation { stroke: var(--amber); stroke-width: 2.4; }
svg.graph .node text {
  fill: var(--ink);
  font-size: 11px;
  text-anchor: middle;
  dominant-baseline: middle;
}
svg.graph .node:hover circle { fill: var(--line-soft); }

/* ---------------------------------------------------------------------------------- phones */

@media (max-width: 680px) {
  .wrap { grid-template-columns: 1fr; padding: 32px 16px 64px; }
  aside { position: static; order: 2; border-top: 1px solid var(--line-soft); padding-top: 16px; }
  .bar { gap: 16px; padding: 14px 16px; flex-wrap: wrap; }
  .bar nav { gap: 14px; order: 3; width: 100%; }
  main h1 { font-size: 1.75rem; }
}