/*
 * Skrog docs. Hand-written, ~300 lines, no framework and no webfonts: the
 * page makes zero requests it does not control, which is the same promise the
 * product makes. System fonts also render a Windows-first project the way its
 * readers' machines already look.
 */

:root {
  --teal: #0a7d84;
  --teal-bright: #3fb6bd;
  --ink: #1c2226;
  --body: #3b464e;
  --muted: #6b7780;
  --rule: #e2e6e9;
  --bg: #ffffff;
  --bg-soft: #f6f8f9;
  --code-bg: #f4f6f7;
  --link: var(--teal);
  --sidebar-w: 17rem;
  --measure: 46rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --teal: #3fb6bd;
    --teal-bright: #6fd4da;
    --ink: #e8edf0;
    --body: #bcc7cf;
    --muted: #8b98a2;
    --rule: #2a343b;
    --bg: #161b1f;
    --bg-soft: #1c2328;
    --code-bg: #1c2328;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--body);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--teal-bright); }

.skip {
  position: absolute; left: -9999px;
  background: var(--bg); color: var(--ink); padding: .6rem 1rem; z-index: 10;
}
.skip:focus { left: 1rem; top: .5rem; }

/* ---- chrome ---- */

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .75rem clamp(1rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--rule);
  background: var(--bg-soft);
  position: sticky; top: 0; z-index: 5;
}
.brand {
  display: flex; align-items: center; gap: .55rem;
  font-weight: 650; font-size: 1.05rem; color: var(--ink); text-decoration: none;
}
.brand img { display: block; }
.topnav { display: flex; gap: 1.25rem; font-size: .92rem; }
.topnav a { color: var(--body); text-decoration: none; }
.topnav a:hover { color: var(--teal); text-decoration: underline; }

.shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  max-width: 78rem; margin: 0 auto;
  padding: 2rem clamp(1rem, 4vw, 2.5rem);
}

.sidebar { font-size: .93rem; position: sticky; top: 4.5rem; align-self: start; max-height: calc(100vh - 6rem); overflow-y: auto; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar .sections > li { margin-bottom: 1.5rem; }
.sidebar h2 {
  font-size: .74rem; text-transform: uppercase; letter-spacing: .09em;
  color: var(--muted); margin: 0 0 .5rem; font-weight: 650;
}
.sidebar li a {
  display: block; padding: .22rem 0 .22rem .7rem;
  border-left: 2px solid var(--rule);
  color: var(--body); text-decoration: none;
}
.sidebar li a:hover { color: var(--teal); border-left-color: var(--teal); }
.sidebar li a[aria-current="page"] {
  color: var(--teal); font-weight: 600; border-left-color: var(--teal);
}

.navtoggle-label { display: none; }

/* ---- prose ---- */

.prose { max-width: var(--measure); }
.prose h1, .prose h2, .prose h3, .prose h4 {
  color: var(--ink); line-height: 1.25; font-weight: 650;
  scroll-margin-top: 4.5rem;
}
.prose h1 { font-size: 2rem; margin: 0 0 1rem; letter-spacing: -.015em; }
.prose h2 { font-size: 1.35rem; margin: 2.4rem 0 .8rem; padding-bottom: .3rem; border-bottom: 1px solid var(--rule); }
.prose h3 { font-size: 1.08rem; margin: 1.9rem 0 .6rem; }
.prose h4 { font-size: .98rem; margin: 1.5rem 0 .5rem; }
.prose p, .prose ul, .prose ol { margin: 0 0 1rem; }
.prose li { margin-bottom: .3rem; }
.prose img { max-width: 100%; height: auto; }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0 1.25rem; }

.lede { font-size: 1.12rem; color: var(--muted); margin-bottom: 2rem; }

blockquote {
  margin: 1.25rem 0; padding: .1rem 1.1rem;
  border-left: 3px solid var(--teal);
  background: var(--bg-soft); color: var(--body);
}
blockquote p { margin: .8rem 0; }

code {
  font-family: ui-monospace, "Cascadia Mono", Consolas, "SF Mono", Menlo, monospace;
  font-size: .88em;
}
:not(pre) > code {
  background: var(--code-bg); border: 1px solid var(--rule);
  border-radius: 4px; padding: .1em .34em;
}
pre {
  background: var(--code-bg); border: 1px solid var(--rule); border-radius: 6px;
  padding: .85rem 1rem; overflow-x: auto; margin: 0 0 1.25rem;
  line-height: 1.5;
}
pre code { background: none; border: 0; padding: 0; }

table { border-collapse: collapse; width: 100%; margin: 0 0 1.25rem; font-size: .93rem; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--rule); padding: .45rem .7rem; text-align: left; vertical-align: top; }
th { background: var(--bg-soft); color: var(--ink); font-weight: 650; }

kbd {
  font-family: inherit; font-size: .85em; border: 1px solid var(--rule);
  border-bottom-width: 2px; border-radius: 4px; padding: .05em .35em; background: var(--bg-soft);
}

/* ---- page furniture ---- */

.crumbs { font-size: .84rem; color: var(--muted); margin-bottom: 1rem; }
.crumbs a { color: var(--muted); }
.crumbs span { margin: 0 .1rem; }

.toc {
  background: var(--bg-soft); border: 1px solid var(--rule); border-radius: 6px;
  padding: .6rem .9rem; margin: 0 0 1.75rem; font-size: .91rem;
}
.toc summary { cursor: pointer; color: var(--muted); font-weight: 600; }
.toc ul { margin: .5rem 0 .2rem; padding-left: 1.1rem; }
.toc li { margin-bottom: .15rem; }
.toc > summary + #TableOfContents > ul { padding-left: 1rem; }

.edit { font-size: .88rem; color: var(--muted); }

.group { margin-top: 2.5rem; }
.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: .55rem; }
.cards li {
  border: 1px solid var(--rule); border-radius: 6px; padding: .65rem .9rem;
  background: var(--bg-soft);
}
.cards li a { text-decoration: none; }
.cards li a:hover strong { text-decoration: underline; }
.cards li span { display: block; color: var(--muted); font-size: .89rem; margin-top: .15rem; }

.foot {
  border-top: 1px solid var(--rule); margin-top: 3rem;
  padding: 1.5rem clamp(1rem, 4vw, 2.5rem) 2.5rem;
  font-size: .88rem; color: var(--muted);
  max-width: 78rem; margin-left: auto; margin-right: auto;
}
.foot p { margin: .3rem 0; }
.muted { color: var(--muted); }

/* ---- narrow ---- */

@media (max-width: 56rem) {
  .shell { grid-template-columns: minmax(0, 1fr); gap: 1rem; }
  .sidebar { position: static; max-height: none; display: none; border: 1px solid var(--rule); border-radius: 6px; padding: .9rem 1.1rem; }
  .navtoggle:checked ~ .sidebar { display: block; }
  .navtoggle-label {
    display: inline-block; cursor: pointer; user-select: none;
    border: 1px solid var(--rule); border-radius: 6px; background: var(--bg-soft);
    padding: .4rem .8rem; font-size: .9rem; font-weight: 600; color: var(--ink);
  }
  .navtoggle:checked ~ .navtoggle-label { border-color: var(--teal); color: var(--teal); }
  .topnav { gap: .9rem; font-size: .86rem; }
  .prose h1 { font-size: 1.6rem; }
}

/* A code chip is right in body text and heavy in a heading, a nav item or a
   breadcrumb, where the title just happens to contain a flag name. */
.prose h1 code, .sidebar code, .crumbs code, .cards code {
  background: none; border: 0; padding: 0; font-size: .93em;
}