/* FastClick documentation — modern, minimal. */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --fg: #14161a;
  --muted: #5f6672;
  --line: #e6e8ec;
  --accent: #4f46e5;
  --accent-2: #06b6d4;
  --accent-soft: #eef0ff;
  --code-bg: #f3f4f7;
  --pre-bg: #0f1218;
  --pre-fg: #e4e7ee;
  --radius: 12px;
  --sans: ui-sans-serif, -apple-system, "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0d12; --bg-soft: #12151c; --fg: #eceef3; --muted: #9aa1ae; --line: #1f232c;
    --accent: #8b93ff; --accent-2: #22d3ee; --accent-soft: #1a1d33; --code-bg: #171a22;
    --pre-bg: #12151c; color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { scroll-padding-top: 5rem; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.7 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
code, pre { font-family: var(--mono); font-size: .86em; }
code { background: var(--code-bg); padding: .12em .4em; border-radius: 6px; }
pre { background: var(--pre-bg); color: var(--pre-fg); padding: 1rem 1.2rem; overflow-x: auto; line-height: 1.55; border-radius: var(--radius); border: 1px solid var(--line); }
pre code { background: none; padding: 0; color: inherit; font-size: 1em; }
h1, h2, h3, h4 { line-height: 1.2; letter-spacing: -.02em; font-weight: 650; }

/* header */
.top {
  position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 1.5rem;
  padding: .75rem 1.5rem; background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); font-size: .92rem;
}
.brand { font-weight: 750; font-size: 1.1rem; color: var(--fg); letter-spacing: -.02em; }
.brand:hover { text-decoration: none; }
.brand .mark { background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.top nav { display: flex; gap: .3rem; flex: 1; flex-wrap: wrap; }
.top nav a { color: var(--muted); padding: .3rem .7rem; border-radius: 8px; }
.top nav a:hover { color: var(--fg); background: var(--bg-soft); text-decoration: none; }
.top nav a.on { color: var(--fg); background: var(--bg-soft); }
.search { position: relative; }
.search input { width: 16rem; max-width: 100%; padding: .45rem .8rem; font: inherit; color: var(--fg); background: var(--bg-soft); border: 1px solid var(--line); border-radius: 10px; }
.search input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
#results { position: absolute; right: 0; top: 2.7rem; width: min(30rem, 90vw); max-height: 70vh; overflow-y: auto; margin: 0; padding: .4rem; list-style: none; background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 16px 40px rgba(0,0,0,.14); }
#results li a { display: block; padding: .5rem .7rem; color: var(--fg); border-radius: 8px; }
#results li a:hover, #results li a.sel { background: var(--accent-soft); text-decoration: none; }
#results b { display: block; font-family: var(--mono); font-size: .88rem; font-weight: 600; }
#results small { display: block; color: var(--muted); font-size: .8rem; line-height: 1.4; }
#results .kind { color: var(--accent); font-size: .68rem; text-transform: uppercase; letter-spacing: .06em; font-weight: 600; }

/* layout */
.page { display: grid; grid-template-columns: minmax(0, 1fr); max-width: 76rem; margin: 0 auto; padding: 2rem 1.5rem 4rem; gap: 3rem; }
.page.has-side { grid-template-columns: 14rem minmax(0, 1fr); }
.page.has-side:has(.toc) { grid-template-columns: 14rem minmax(0, 1fr) 13rem; }
.page:not(.has-side):has(.toc) { grid-template-columns: minmax(0, 1fr) 13rem; }
main { min-width: 0; }
.page.wide main { max-width: 56rem; margin: 0 auto; }
.side, .toc { font-size: .88rem; position: sticky; top: 5rem; align-self: start; max-height: calc(100vh - 6rem); overflow-y: auto; }
.side summary { display: none; }
.side h4, .toc h4 { margin: 1.4rem 0 .4rem; padding-left: .7rem; font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 600; }
.side h4:first-of-type { margin-top: 0; }
.side ul, .toc ul { list-style: none; margin: 0; padding: 0; }
.toc ul ul { padding-left: .8rem; }
.side li a, .toc li a { display: block; padding: .25rem .7rem; color: var(--muted); border-radius: 8px; }
.side li a:hover, .toc li a:hover { color: var(--fg); text-decoration: none; background: var(--bg-soft); }
.side li a.on { color: var(--accent); background: var(--accent-soft); font-weight: 600; }

/* article */
.doc { max-width: 46rem; }
.doc h1 { font-size: 2.3rem; margin: 0 0 .6rem; }
.doc h2 { font-size: 1.45rem; margin: 2.6rem 0 .7rem; }
.doc h3 { font-size: 1.15rem; margin: 1.9rem 0 .4rem; }
.doc .headerlink { margin-left: .4rem; color: var(--muted); font-weight: 400; opacity: 0; }
.doc h2:hover .headerlink, .doc h3:hover .headerlink { opacity: .7; text-decoration: none; }
.doc img { max-width: 100%; height: auto; border-radius: 8px; }
.lead { font-size: 1.1rem; color: var(--muted); margin-top: 0; }
.crumb { font-size: .85rem; color: var(--muted); margin: 0 0 .8rem; }
.badge { display: inline-block; padding: 0 .6rem; background: var(--accent-soft); border-radius: 99px; color: var(--accent); font-weight: 500; }
blockquote { margin: 1.2rem 0; padding: .1rem 1.1rem; border-left: 3px solid var(--accent); background: var(--bg-soft); border-radius: 0 8px 8px 0; color: var(--muted); }
.tablewrap { overflow-x: auto; margin: 1.2rem 0; border: 1px solid var(--line); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: .93rem; }
th { text-align: left; background: var(--bg-soft); font-weight: 600; }
th, td { padding: .6rem .9rem; vertical-align: top; }
tbody tr + tr td { border-top: 1px solid var(--line); }
h2#synopsis + p { font-family: var(--mono); font-size: .9rem; background: var(--code-bg); padding: .6rem .9rem; border-radius: 8px; overflow-x: auto; }
.element h2 { font-size: .78rem; text-transform: uppercase; letter-spacing: .09em; color: var(--muted); margin-top: 2.2rem; }

ul.plain { list-style: none; padding: 0; }
ul.plain li { padding: .12rem 0; }
.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: 0 2rem; }
.cols section h2 { font-size: 1rem; margin-top: 1.6rem; }
ul.cols3 { columns: 3 10rem; }
.catnav { font-size: .9rem; color: var(--muted); }
.elist { list-style: none; padding: 0; margin: 0; }
.elist li { display: grid; grid-template-columns: 15rem 1fr; gap: 1rem; padding: .4rem 0; border-top: 1px solid var(--line); }
.elist li span { color: var(--muted); font-size: .93rem; }
.doc h2 small { color: var(--muted); font-size: .75rem; font-weight: 400; }

/* landing */
.hero { text-align: center; display: flex; align-items: center; justify-content: center; padding: 4rem 0 17rem; position: relative; }
.hero::before { content: ""; position: absolute; inset: -4rem -20% auto; height: 28rem; z-index: -1;
  background: radial-gradient(ellipse at 50% 0, color-mix(in srgb, var(--accent) 22%, transparent), transparent 65%); }
.pill { display: inline-block; margin: 0 0 1.4rem; padding: .3rem .9rem; font-size: .82rem; color: var(--muted); border: 1px solid var(--line); border-radius: 99px; background: var(--bg-soft); }
.hero h1 { font-size: clamp(2.6rem, 7vw, 4.4rem); margin: 0; letter-spacing: -.04em; line-height: 1.05; }
.grad { background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.subtitle { font-size: 1.15rem; color: var(--muted); margin: 1.2rem auto 2rem; max-width: 36rem; }
.cta { display: flex; flex-wrap: wrap; gap: .7rem; justify-content: center; margin: 0; }
.btn { display: inline-block; padding: .6rem 1.2rem; border: 1px solid var(--line); border-radius: 99px; color: var(--fg); font-weight: 500; font-size: .95rem; background: var(--bg); }
.btn:hover { background: var(--bg-soft); text-decoration: none; }
.btn.primary { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.btn.primary:hover { opacity: .88; background: var(--fg); }
.btn.ghost { border-color: transparent; color: var(--muted); }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1rem; margin: 2rem 0 3.5rem; }
.card { padding: 1.3rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-soft); transition: transform .15s, border-color .15s; }
.card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); }
.card h3 { margin: 0 0 .4rem; font-size: 1.05rem; }
.card p { margin: 0 0 .8rem; color: var(--muted); font-size: .94rem; line-height: 1.55; }
.card a { font-size: .88rem; font-weight: 500; }
main > section.start, main > section.cite { margin: 3rem 0; }
main > section h2 { font-size: 1.6rem; margin: 0 0 .8rem; }
.more { color: var(--muted); font-size: .94rem; }

footer { border-top: 1px solid var(--line); padding: 1.8rem 1.5rem; text-align: center; font-size: .82rem; color: var(--muted); }
footer p { max-width: 46rem; margin: 0 auto; }

/* animated graph, used as hero background */
.hero-copy { position: relative; z-index: 1; }
.hero-bg { position: absolute; z-index: 0; bottom: 1rem; left: 50%; width: min(100vw, 1300px); height: 15.5rem; transform: translateX(-50%); pointer-events: none; opacity: .75;
  -webkit-mask-image: linear-gradient(to right, transparent, #000 3%, #000 97%, transparent); mask-image: linear-gradient(to right, transparent, #000 3%, #000 97%, transparent); }
.graph-svg { display: block; width: 100%; height: 100%; font-family: var(--sans); }
.g-node { fill: var(--bg); stroke: var(--muted); stroke-width: 1.2; }
.g-edge { stroke: var(--muted); stroke-width: 1.4; fill: none; opacity: .7; }
.g-name { fill: var(--fg); font-size: 14px; font-weight: 600; }
.g-sub { fill: var(--muted); font-size: 12px; font-family: var(--mono); }
.g-tag { fill: var(--muted); font-size: 11px; letter-spacing: .1em; }
.g-node.g-dim { stroke-dasharray: 4 3; stroke: var(--line); }
.g-dash { stroke-dasharray: 4 3; }
.g-pkt { stroke: var(--bg); stroke-width: 1; }
.g-chip { fill: var(--bg); stroke: var(--muted); stroke-width: 1.2; }
.g-link { stroke-dasharray: 2 3; }
.g-pin { stroke: var(--muted); stroke-width: 1.4; opacity: .7; }
@media (max-width: 62rem) { .hero-bg { opacity: .3; } }

/* syntax highlighting (codehilite on dark blocks) */
.codehilite { margin: 1rem 0; }
.codehilite pre { margin: 0; }
.codehilite .c, .codehilite .c1, .codehilite .cm, .codehilite .cp { color: #7d8597; font-style: italic; }
.codehilite .k, .codehilite .kt, .codehilite .kd, .codehilite .kn { color: #c4a5ff; }
.codehilite .s, .codehilite .s1, .codehilite .s2 { color: #8fd3a4; }
.codehilite .m, .codehilite .mi { color: #f0c27b; }
.codehilite .nf, .codehilite .nc { color: #7cc4ff; }

@media (max-width: 62rem) {
  .page.has-side, .page.has-side:has(.toc), .page:not(.has-side):has(.toc) { grid-template-columns: minmax(0, 1fr); }
  .toc { display: none; }
  .side { position: static; max-height: none; border: 1px solid var(--line); border-radius: var(--radius); padding: .6rem .8rem; }
  .side summary { display: block; cursor: pointer; font-weight: 600; }
  .side details:not([open]) > :not(summary) { display: none; }
  .top { flex-wrap: wrap; gap: .5rem 1rem; padding: .6rem 1rem; }
  .search { width: 100%; } .search input { width: 100%; }
  .elist li { grid-template-columns: 1fr; gap: 0; }
  .hero { padding-top: 3rem; }
}
@media print { .top, .side, .toc, footer, .cta { display: none; } }