/* PuffinParse docs — layered on tokens.css; no frameworks, no web fonts. */
/* Colour, type and shape come from tokens.css (docs/DESIGN.md); these are local aliases so the
   rules below stay short. Dark theme is handled entirely by tokens.css. */
:root {
  --bg: var(--paper); --bg-soft: var(--paper-2); --surface: var(--paper-3);
  --fg: var(--ink); --fg-dim: var(--ink-2); --fg-faint: var(--ink-3);
  --line: var(--rule); --line-soft: var(--rule-2);
  --accent: var(--scan-ink); --accent-soft: var(--scan-wash); --ok: var(--good);
  --mono: var(--font-mono); --sans: var(--font-sans);
  --sidebar: 15.5rem; --toc: 13rem; --radius: var(--r-2);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { animation: none !important; transition: none !important; } }
body { margin: 0; background: var(--bg); color: var(--fg); font-family: var(--sans);
  font-size: 15px; line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: var(--link); text-decoration: none; }
a:hover { color: var(--scan-ink); }
article a { text-decoration: underline; text-decoration-color: var(--link-underline);
  text-underline-offset: 2px; text-decoration-thickness: 1px; }
article a:hover { color: var(--scan-ink); text-decoration-color: currentColor; }
:focus-visible { outline: 2px solid var(--scan-ink); outline-offset: 2px; }

/* ---- chrome ---- */
.top { position: sticky; top: 0; z-index: 20; height: 3.25rem; border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: saturate(1.4) blur(8px); }
.topin { display: flex; align-items: center; gap: .75rem; height: 100%;
  max-width: 84rem; margin: 0 auto; padding: 0 1.25rem; }
.brand { display: inline-flex; align-items: center; gap: .5rem; font-weight: 640; letter-spacing: -.02em; color: var(--fg); font-size: 1rem; }
.notfound { margin-bottom: 1rem; }
.brand-sub { color: var(--fg-faint); font-weight: 400; margin-left: -.35rem; font-size: .8rem; }
.brand-sub:hover { color: var(--fg-dim); }
.top .spacer { flex: 1; }
.top a.plain, .iconbtn { color: var(--fg-dim); font-size: .82rem; }
.iconbtn { display: flex; align-items: center; background: none; border: 1px solid transparent;
  border-radius: var(--radius); cursor: pointer; padding: .3rem .45rem; color: var(--fg-dim); }
.iconbtn:hover { background: var(--surface); border-color: var(--line); }
#search { width: 13rem; font: inherit; font-size: .82rem; color: var(--fg); background: var(--bg-soft);
  border: 1px solid var(--line); border-radius: var(--radius); padding: .28rem .55rem; }
#search:focus { outline: none; border-color: var(--accent); background: var(--bg); }
.kbd { font-family: var(--mono); font-size: .68rem; border: 1px solid var(--line); border-radius: 4px;
  padding: .05rem .3rem; color: var(--fg-faint); background: var(--bg-soft); }
.searchwrap { position: relative; }
#results { position: absolute; top: 2.1rem; right: 0; width: 22rem; max-height: 60vh; overflow-y: auto;
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: .3rem;
  box-shadow: 0 10px 30px rgb(0 0 0 / .12); }
#results a { display: block; padding: .3rem .5rem; border-radius: 5px; color: var(--fg); font-size: .84rem; }
#results a small { color: var(--fg-faint); margin-left: .4rem; font-size: .74rem; }
#results a.on, #results a:hover { background: var(--accent-soft); text-decoration: none; }

.layout { display: grid; grid-template-columns: var(--sidebar) minmax(0, 1fr); gap: 2.5rem;
  max-width: 84rem; margin: 0 auto; padding: 0 1.25rem; }
.side { padding: 1.75rem 0 4rem; }
.side nav { position: sticky; top: 5rem; max-height: calc(100vh - 6rem); overflow-y: auto; }
.side h4 { margin: 1.4rem 0 .4rem; font-size: .7rem; text-transform: uppercase; letter-spacing: .09em;
  color: var(--fg-faint); font-weight: 620; }
.side h4:first-child { margin-top: 0; }
.side ul { list-style: none; margin: 0; padding: 0; }
.side li a { display: block; padding: .17rem .55rem; margin-left: -.55rem; border-radius: 5px;
  color: var(--fg-dim); font-size: .87rem; }
.side li a:hover { color: var(--fg); background: var(--surface); text-decoration: none; }
.side li a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); font-weight: 540; }

main { padding: 2.25rem 0 5rem; min-width: 0; display: grid; grid-template-columns: minmax(0, 76ch) var(--toc); gap: 2.5rem; }
article { min-width: 0; }
.toc { padding-top: .35rem; }
.toc nav { position: sticky; top: 5rem; max-height: calc(100vh - 7rem); overflow-y: auto; }
.toc strong { display: block; font-size: .7rem; text-transform: uppercase; letter-spacing: .09em;
  color: var(--fg-faint); margin-bottom: .5rem; }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc ul ul { padding-left: .7rem; }
.toc a { display: block; padding: .12rem 0 .12rem .6rem; border-left: 1px solid var(--line);
  color: var(--fg-dim); font-size: .81rem; line-height: 1.45; }
.toc a:hover { color: var(--fg); text-decoration: none; }
.toc a.on { color: var(--accent); border-left-color: var(--accent); }

/* ---- prose ---- */
article h1 { font-size: 2rem; line-height: 1.2; letter-spacing: -.025em; margin: 0 0 .6rem; font-weight: 660; }
article h2 { font-size: 1.24rem; letter-spacing: -.015em; margin: 2.4rem 0 .7rem; font-weight: 620;
  padding-bottom: .35rem; border-bottom: 1px solid var(--line-soft); }
article h3 { font-size: 1.02rem; margin: 1.8rem 0 .5rem; font-weight: 620; }
article h4 { font-size: .92rem; margin: 1.4rem 0 .4rem; font-weight: 620; color: var(--fg-dim); }
article h2 > code, article h3 > code { font-size: .95em; background: none; border: 0; padding: 0; }
article p, article li { margin: .55rem 0; }
article ul, article ol { padding-left: 1.3rem; }
article li > ul, article li > ol { margin: .2rem 0; }
article hr { border: 0; border-top: 1px solid var(--line); margin: 2.5rem 0; }
blockquote { margin: 1rem 0; padding: .1rem 0 .1rem 1rem; border-left: 2px solid var(--line);
  color: var(--fg-dim); }
.headerlink { color: var(--fg-faint); text-decoration: none; margin-left: .4rem; opacity: 0;
  font-weight: 400; font-size: .85em; }
h2:hover .headerlink, h3:hover .headerlink, h4:hover .headerlink { opacity: 1; }

code { font-family: var(--mono); font-size: .855em; }
:not(pre) > code { background: var(--surface); border: 1px solid var(--line-soft); border-radius: 4px;
  padding: .08em .34em; color: var(--fg); }
pre { background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius);
  padding: .85rem 1rem; overflow-x: auto; margin: 1rem 0; line-height: 1.6; }
pre code { background: none; border: 0; padding: 0; font-size: .82rem; }
.codewrap { position: relative; }
.copy { position: absolute; top: .45rem; right: .45rem; font: inherit; font-size: .7rem; cursor: pointer;
  padding: .12rem .45rem; border-radius: 5px; border: 1px solid var(--line); background: var(--bg);
  color: var(--fg-dim); opacity: 0; transition: opacity .12s; }
.codewrap:hover .copy, .copy:focus { opacity: 1; }
.copy.done { color: var(--ok); border-color: var(--ok); opacity: 1; }

.table-wrap { overflow-x: auto; margin: 1rem 0; border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(to right, var(--bg) 30%, transparent),
    linear-gradient(to left, var(--bg) 30%, transparent) 100% 0,
    radial-gradient(farthest-side at 100% 50%, rgb(0 0 0 / .13), transparent) 100% 0;
  background-repeat: no-repeat; background-size: 2rem 100%, 2.5rem 100%, .9rem 100%;
  background-attachment: local, local, scroll; }
table { border-collapse: collapse; width: 100%; font-size: .84rem; line-height: 1.5;
  font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: .42rem .7rem; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
th { font-weight: 600; color: var(--fg-dim); background: var(--bg-soft); white-space: nowrap;
  font-size: .8rem; }
tr:last-child td { border-bottom: 0; }
td code { white-space: nowrap; }

/* ---- home ---- */
.hero { padding: .5rem 0 2rem; border-bottom: 1px solid var(--line-soft); margin-bottom: 2rem; }
.hero h1 { font-size: 2.6rem; margin-bottom: .5rem; }
.hero .lede { font-size: 1.05rem; color: var(--fg-dim); max-width: 56ch; margin: 0 0 1.4rem; }
.hero .lede strong { color: var(--fg); font-weight: 600; }
#swap { color: var(--accent); }
#swap.fade { opacity: .25; transition: opacity .18s; }
.cta { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin-top: 1.2rem; }
.btn { display: inline-block; padding: .38rem .85rem; border-radius: var(--radius); font-size: .86rem;
  border: 1px solid var(--line); color: var(--fg); background: var(--bg-soft); font-weight: 530; }
.btn:hover { text-decoration: none; border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--scan-ink); border-color: var(--scan-ink); color: var(--paper); }
.btn.primary:hover { color: var(--paper); opacity: .9; }
.cta code { background: var(--surface); border: 1px solid var(--line); padding: .34rem .6rem; border-radius: var(--radius); }
.card { border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.1rem; margin: 1.5rem 0;
  background: var(--bg-soft); }
.card > h2, .card > h3 { margin-top: 0; border: 0; padding: 0; font-size: .95rem; }
.card p { font-size: .88rem; color: var(--fg-dim); }
.meta { font-size: .78rem; color: var(--fg-faint); margin: .4rem 0 0; }
.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); gap: .75rem; margin: 1.2rem 0; }
.grid3 .card { margin: 0; }
.grid3 .card h3 { font-size: .9rem; margin-bottom: .2rem; }
.grid3 .card p { margin: .2rem 0 0; font-size: .8rem; line-height: 1.55; }

footer { border-top: 1px solid var(--line); margin-top: 3rem; padding: 1.25rem 0 0;
  font-size: .8rem; color: var(--fg-faint); display: flex; flex-wrap: wrap; gap: .55rem; }
footer a { color: var(--fg-dim); }
.sep::before { content: "·"; margin-right: .55rem; color: var(--line); }

/* ---- narrow ---- */
.menu { display: none; }
@media (max-width: 1100px) { main { grid-template-columns: minmax(0, 1fr); } .toc { display: none; } }
@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .side { display: none; }
  .menu { display: block; border-bottom: 1px solid var(--line); }
  .menu summary { cursor: pointer; list-style: none; padding: .6rem 1.25rem; font-size: .84rem;
    color: var(--fg-dim); }
  .menu summary::-webkit-details-marker { display: none; }
  .menu summary::after { content: "▾"; margin-left: .4rem; }
  .menu[open] summary::after { content: "▴"; }
  .menu .side { display: block; padding: 0 1.25rem 1.25rem; }
  .menu .side nav { position: static; max-height: none; }
  #search { width: 8.5rem; }
  .hero pre { padding: .75rem .85rem; }
  .hero pre code { font-size: .76rem; white-space: pre-wrap; overflow-wrap: anywhere; }
  #results { width: min(22rem, calc(100vw - 2.5rem)); right: -3rem; }
  .hero h1 { font-size: 2rem; }
  main { padding-top: 1.5rem; }
  article h1 { font-size: 1.7rem; }
}
@media (max-width: 560px) {
  .top .hide-sm { display: none; }
  .topin { gap: .5rem; padding: 0 1rem; }
  #search { width: 7.5rem; }
}