/* Cooper, marcusberley.com's heading face: Medium and Medium Italic only, as there.
   Weights 400-700 map to the one file so bold headings can't trigger a synthetic bold. */
@font-face{font-family:"Cooper";src:url(/fonts/cooper-medium.woff2) format("woff2");font-weight:400 700;font-style:normal;font-display:swap}
@font-face{font-family:"Cooper";src:url(/fonts/cooper-medium-italic.woff2) format("woff2");font-weight:400 700;font-style:italic;font-display:swap}
:root{
  --paper:#fbf8f2; --surface:#ffffff; --ink:#1d2320; --muted:#5d6661; --line:#e4ddd0;
  --accent:#004d48; --accent-soft:#f0f7f6; --callout:#f4efe4; --code:#f3efe7;
  --serif: "Cooper","Iowan Old Style","Charter","Palatino Linotype",Georgia,serif;
  --sans: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",sans-serif;
  --mono: ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  /* Motion: marcusberley.com's one easing and durations, so both sites move alike. */
  --ease-soft:cubic-bezier(0.22,1,0.36,1); --duration-quick:180ms;
}
@media (prefers-color-scheme: dark){
  :root{
    --paper:#141816; --surface:#1b201e; --ink:#e6e8e4; --muted:#9aa39e; --line:#2e3532;
    --accent:#6cc0b6; --accent-soft:#1a2b29; --callout:#1f2522; --code:#202624;
  }
}
*{box-sizing:border-box}
/* Page changes cross-fade like marcusberley.com's: a cross-document view transition,
   CSS only, skipped by browsers without it and off under reduced motion. */
@media (prefers-reduced-motion:no-preference){
  @view-transition{navigation:auto}
  ::view-transition-old(root),::view-transition-new(root){animation-duration:var(--duration-quick);animation-timing-function:var(--ease-soft)}
}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.65 var(--sans);}
a{color:var(--accent);text-underline-offset:2px}
a:hover{text-decoration-thickness:2px}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
header.site{position:relative;border-bottom:1px solid var(--line);background:var(--paper)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:14px;padding-bottom:14px}
.brand{font-family:var(--serif);font-size:19px;font-weight:600;color:var(--ink);text-decoration:none;letter-spacing:.1px}
.brand span{color:var(--accent)}
header.site .wrap>nav a{color:var(--muted);text-decoration:none;font-size:15px;margin-left:18px}
header.site .wrap>nav a:hover{color:var(--ink)}
/* Phone menu: a <details> disclosure, since the CSP allows no script. */
details.menu{display:none}
details.menu summary{list-style:none;cursor:pointer;font-size:15px;font-weight:600;color:var(--accent);padding:6px 12px;border:1px solid var(--line);border-radius:999px;background:var(--surface)}
details.menu summary::-webkit-details-marker{display:none}
details.menu[open] summary{background:var(--accent);border-color:var(--accent);color:var(--paper)}
.menu-panel{position:absolute;left:0;right:0;top:100%;background:var(--paper);border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(0,0,0,.12);max-height:calc(100dvh - 60px);overflow-y:auto;overscroll-behavior:contain;padding:8px 16px 20px;font-size:16px}
.menu-panel h4{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:18px 0 4px;font-weight:600}
.menu-panel h4 a{color:inherit;text-decoration:none}
.menu-panel > a{display:block;color:var(--ink);text-decoration:none;padding:8px 0 8px 10px;border-left:2px solid transparent}
.menu-panel > a.current{border-left-color:var(--accent);color:var(--accent);font-weight:600}
.menu-panel .menu-foot{display:flex;gap:18px;margin-top:18px;padding-top:14px;border-top:1px solid var(--line);font-size:15px}

/* Home */
.hero{padding:64px 0 28px}
.eyebrow{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);font-weight:600;margin:0 0 12px}
.hero h1{font-family:var(--serif);font-weight:600;font-size:clamp(34px,5vw,52px);line-height:1.1;margin:0 0 18px;max-width:18ch}
.hero p.lede{font-size:20px;color:var(--muted);max-width:60ch;margin:0}
.notice{margin:34px 0 8px;padding:16px 20px;background:var(--callout);border-left:3px solid var(--accent);border-radius:4px;font-size:15.5px;max-width:78ch}
.notice strong{color:var(--ink)}
.how{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:34px 0 10px}
.how div{padding:0}
.how h3{font-family:var(--serif);font-size:18px;margin:0 0 4px}
.how p{margin:0;color:var(--muted);font-size:15.5px}
section.group{padding:40px 0 8px;border-top:1px solid var(--line);margin-top:40px}
section.group > h2{font-family:var(--serif);font-size:28px;font-weight:600;margin:0 0 4px}
section.group > p{color:var(--muted);margin:0 0 22px;max-width:70ch}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:18px 20px;text-decoration:none;color:var(--ink);transition:border-color var(--duration-quick) var(--ease-soft),transform var(--duration-quick) var(--ease-soft)}
.card:hover{border-color:var(--accent);transform:translateY(-1px)}
.card h3{font-family:var(--serif);font-size:19px;margin:0 0 6px;color:var(--ink)}
.card p{margin:0;font-size:15px;color:var(--muted);line-height:1.5}
.bundle{margin:48px 0 0;padding:22px 24px;background:var(--accent-soft);border-radius:10px;display:flex;gap:18px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.bundle p{margin:0}
.btn{display:inline-block;background:var(--accent);color:var(--paper);padding:10px 16px;border-radius:8px;text-decoration:none;font-weight:600;font-size:15px;white-space:nowrap}
.btn:hover{opacity:.92}
.btn.ghost{background:transparent;color:var(--accent);border:1px solid var(--accent)}

/* Home site map (build_sitemap): inline SVG, styled only from here */
.sitemap{margin:8px 0 0}
.sitemap h2{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);font-weight:600;margin:0 0 2px}
.sitemap .sm-sub{margin:0 0 18px;color:var(--muted);font-size:15px}
.sm{display:block;width:100%;height:auto;overflow:visible}
.sm-wide{max-width:1080px}
.sm-mid{display:none;max-width:680px}
.sm text{font-family:var(--sans);fill:var(--ink)}
.sm .sm-eye{font-size:13px;font-weight:600;letter-spacing:.12em;fill:var(--muted)}
.sm .sm-name{font-family:var(--serif);font-size:18px;font-weight:600}
.sm .sm-rule{stroke:var(--line);stroke-width:1}
.sm-hit{fill:transparent;stroke:none}
.sm-page rect{fill:var(--surface);stroke:var(--line);stroke-width:1;transition:stroke var(--duration-quick) var(--ease-soft)}
.sm-page text{font-size:13px;font-weight:500;text-anchor:middle}
.sm-page.focal rect{fill:var(--accent-soft);stroke:var(--accent)}
.sm a:hover rect{stroke:var(--accent)}
.sm a:hover .sm-name{fill:var(--accent)}
.sm a:focus{outline:none}
.sm a:focus-visible rect{stroke:var(--accent);stroke-width:3}
.sm a.sm-sec:focus-visible .sm-hit{stroke-width:2}
/* Wide text is 13 units at scale (viewport-40)/1080: at 1100px that is 12.7px (12.5 with a 17px scrollbar).
   Mid is 680 units, drawn at 1:1 from 720px up. Under 720px the map is hidden: the Menu and the section headings cover it. */
@media (max-width:1099px){.sm-wide{display:none}.sm-mid{display:block}}
@media (max-width:719px){.sitemap{display:none}}

/* Doc page */
.doc-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:48px;padding-top:36px;padding-bottom:40px}
aside.toc{position:sticky;top:20px;align-self:start;font-size:14.5px;max-height:calc(100vh - 40px);overflow:auto}
aside.toc h4{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:18px 0 6px;font-weight:600}
aside.toc h4:first-child{margin-top:0}
aside.toc a{display:block;color:var(--ink);text-decoration:none;padding:3px 0 3px 10px;border-left:2px solid transparent}
aside.toc a:hover{color:var(--accent)}
aside.toc a.current{border-left-color:var(--accent);color:var(--accent);font-weight:600}
article{max-width:760px;min-width:0;overflow-wrap:break-word}
.crumb{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:10px}
.downloads{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:0 0 28px;padding-bottom:24px;border-bottom:1px solid var(--line)}
.dl-note{flex-basis:100%;margin:4px 0 0;font-size:14px;color:var(--muted)}
article h1{font-family:var(--serif);font-weight:600;font-size:clamp(30px,4vw,40px);line-height:1.15;margin:0 0 16px}
article h2{font-family:var(--serif);font-weight:600;font-size:26px;margin:44px 0 10px;line-height:1.25}
article h3{font-family:var(--serif);font-weight:600;font-size:20px;margin:30px 0 8px}
article h4{font-size:16px;margin:24px 0 6px}
article hr{border:0;border-top:1px solid var(--line);margin:36px 0}
article blockquote{margin:22px 0;padding:14px 20px;background:var(--callout);border-left:3px solid var(--accent);border-radius:4px}
article blockquote p{margin:8px 0}
article code{font-family:var(--mono);font-size:.88em;background:var(--code);padding:1px 5px;border-radius:4px}
article pre{background:var(--code);padding:14px 16px;border-radius:8px;overflow-x:auto;font-size:14px;line-height:1.5}
article pre code{background:none;padding:0;font-size:inherit}
.table-wrap{overflow-x:auto;margin:18px 0;border:1px solid var(--line);border-radius:8px;background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:15px;line-height:1.45}
th,td{text-align:left;vertical-align:top;padding:9px 12px;border-bottom:1px solid var(--line)}
th{font-weight:600;background:var(--accent-soft)}
tr:last-child td{border-bottom:0}
li.task{list-style:none;position:relative}
ul:has(> li.task){padding-left:4px}
.box{display:inline-block;width:15px;height:15px;border:1.5px solid var(--muted);border-radius:3px;margin-right:9px;vertical-align:-2px}
li.done .box{background:var(--accent);border-color:var(--accent)}
/* State tabs. The site's CSP is script-src 'none', so these are CSS-only:
   hidden radios drive the panels through :has(). Without :has() support every
   panel shows, which is the pre-tabs reading of the page. */
.states{margin:22px 0}
.state-tabs{position:relative;display:flex;flex-wrap:wrap;gap:8px}
.state-tabs input{position:absolute;left:0;top:0;width:1px;height:1px;opacity:0;margin:0}
.state-tabs label{display:inline-block;cursor:pointer;font-size:15px;font-weight:600;padding:7px 15px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--muted)}
.state-tabs label:hover{border-color:var(--accent);color:var(--accent)}
.state-tabs input:checked+label{background:var(--accent);border-color:var(--accent);color:var(--paper)}
.state-tabs input:focus-visible+label{outline:2px solid var(--accent);outline-offset:2px}
.state-panel>:first-child{margin-top:16px}
@supports selector(:has(*)){
  .state-panels>.state-panel{display:none}
  .states:has(.state-tabs>input:nth-of-type(1):checked) .state-panels>.state-panel:nth-of-type(1),
  .states:has(.state-tabs>input:nth-of-type(2):checked) .state-panels>.state-panel:nth-of-type(2),
  .states:has(.state-tabs>input:nth-of-type(3):checked) .state-panels>.state-panel:nth-of-type(3),
  .states:has(.state-tabs>input:nth-of-type(4):checked) .state-panels>.state-panel:nth-of-type(4){display:block}
  .state-name{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
}
.pager{display:flex;justify-content:space-between;gap:16px;margin-top:56px;padding-top:22px;border-top:1px solid var(--line)}
.pager a{text-decoration:none;max-width:48%}
.pager small{display:block;color:var(--muted);font-size:12px;letter-spacing:.08em;text-transform:uppercase}
.pager span{font-family:var(--serif);font-size:18px}
footer.site{border-top:1px solid var(--line);margin-top:40px;padding:26px 0 40px;color:var(--muted);font-size:14px}
footer.site p{margin:4px 0;max-width:80ch}


/* Seven section links stop fitting on one line below this width */
@media (max-width:1040px){
  header.site .wrap>nav{display:none}
  details.menu{display:block}
}
@media (max-width:860px){
  .doc-layout{grid-template-columns:minmax(0,1fr);gap:0;padding-top:24px}
  aside.toc{display:none}
  .how{grid-template-columns:1fr}
  header.site .wrap>nav{display:none}
  header.site{position:sticky;top:0;z-index:10}
  details.menu{display:block}
  article :is(h2,h3,h4){scroll-margin-top:72px}
  .hero{padding-top:40px}
}
@media (max-width:480px){
  body{font-size:16px}
  .wrap{padding:0 16px}
  .cards{grid-template-columns:1fr}
}
@media print{
  header.site,aside.toc,.downloads,.pager,footer.site,.state-tabs,.sitemap{display:none}
  .state-panels>.state-panel{display:block!important}
  .state-name{position:static!important;width:auto!important;height:auto!important;clip-path:none!important}
  .doc-layout{display:block}
  body{background:#fff;color:#000}
}
/* Reduced motion: no hover lift, no fades. Last, so it wins over the rules above. */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:0.01ms !important;animation-duration:0.01ms !important}
  .card:hover{transform:none}
}