/* Docs app (docs.html). Shares the landing page's palette; dark by default,
   light when the reader's system asks for it. */
:root {
  --bg: #0b0b0f;
  --fg: #f0f0f4;
  --muted: #a2a2ad;
  --line: #26262f;
  --panel: #16161d;
  --accent: #8d8bff;
  --code-bg: #1f1f24;
  --code-fg: #dfdfe6;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff;
    --fg: #1d1d1f;
    --muted: #6e6e73;
    --line: #e5e5ea;
    --panel: #f5f5f7;
    --accent: #5856d6;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 60px;
  padding: 0 24px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: center; gap: 10px; color: var(--fg); font-weight: 650; white-space: nowrap; }
.brand img { border-radius: 7px; }
.brand .tag { font: 500 12px var(--mono); color: var(--muted); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; }
.brand:hover { text-decoration: none; }

nav.pages { display: flex; gap: 2px; flex: 1; }
nav.pages a { padding: 6px 12px; border-radius: 8px; color: var(--muted); font-weight: 500; font-size: 15px; white-space: nowrap; }
nav.pages a:hover { color: var(--fg); text-decoration: none; }
nav.pages a[aria-current] { color: var(--fg); background: var(--panel); }
.repo { font-weight: 500; white-space: nowrap; }

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 230px;
  gap: 56px;
  max-width: 1240px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

main { min-width: 0; max-width: 860px; }
main h1 { font-size: 2.5rem; line-height: 1.12; letter-spacing: -0.03em; margin-top: 0; }
main h2 { margin-top: 2.6em; padding-bottom: 8px; border-bottom: 1px solid var(--line); letter-spacing: -0.02em; }
main h3 { margin-top: 1.9em; letter-spacing: -0.01em; }
main :is(h1, h2, h3, h4) { scroll-margin-top: 76px; }
main img { max-width: 100%; height: auto; }
main > p > img { display: block; max-width: 300px; margin: 20px auto; border-radius: 34px; border: 8px solid #26262c; box-shadow: 0 20px 50px -20px rgb(0 0 0 / 0.6); }
main blockquote { margin: 16px 0; padding: 4px 16px; border-left: 3px solid var(--accent); color: var(--muted); }

code {
  font: 0.87em/1.5 var(--mono);
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 0.08em 0.36em;
  border-radius: 6px;
}
pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 16px 18px;
  border-radius: 12px;
  overflow-x: auto;
  border: 1px solid #33333f;
}
pre code { background: none; border: 0; padding: 0; color: inherit; font-size: 13.5px; line-height: 1.65; }

table { border-collapse: collapse; width: 100%; margin: 18px 0; font-size: 0.94em; display: block; overflow-x: auto; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }

.mermaid {
  margin: 22px 0;
  padding: 16px;
  /* C4 relation labels are unreadable on dark: diagrams render on white */
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow-x: auto;
  text-align: center;
}
.mermaid svg { max-width: 100%; height: auto; }

.gallery {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 8px 2px 16px;
  scroll-snap-type: x mandatory;
}
.gallery figure { margin: 0; flex: 0 0 210px; scroll-snap-align: start; text-align: center; }
.gallery img { width: 100%; border-radius: 30px; border: 7px solid #26262c; box-shadow: 0 10px 30px -10px rgb(0 0 0 / 0.5); }
.gallery figcaption { margin-top: 8px; color: var(--muted); font-size: 0.9em; }

#toc { position: sticky; top: 84px; align-self: start; max-height: calc(100vh - 110px); overflow-y: auto; font-size: 0.88em; }
#toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
#toc li a { display: block; padding: 4px 12px; color: var(--muted); }
#toc li.h3 a { padding-left: 24px; }
#toc li a:hover { color: var(--fg); text-decoration: none; }
.toc-title { margin: 0 0 10px; font: 600 11px var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }

.footer { border-top: 1px solid var(--line); padding: 24px; color: var(--muted); font-size: 0.88em; text-align: center; }

/* Swift syntax colours (Xcode Default Dark), used by highlight.js */
.hljs-keyword, .hljs-literal { color: #fc5fa3; font-weight: 600; }
.hljs-built_in, .hljs-type, .hljs-title.class_ { color: #5dd8ff; }
.hljs-title.function_, .hljs-title { color: #67b7a4; }
.hljs-string { color: #fc6a5d; }
.hljs-number { color: #d0bf69; }
.hljs-comment { color: #7f8c98; font-style: italic; }
.hljs-meta, .hljs-attribute { color: #fd8f3f; }
.hljs-attr { color: #5dd8ff; }

@media (max-width: 960px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  #toc { display: none; }
  .topbar { position: static; flex-wrap: wrap; height: auto; gap: 4px 16px; padding: 10px 16px; }
  .repo { margin-left: auto; }
  nav.pages { order: 3; flex: 0 0 100%; overflow-x: auto; }
  main :is(h1, h2, h3, h4) { scroll-margin-top: 8px; }
}