:root{
  --ground:#F6F8FB; --paper:#FFFFFF; --ink:#141922; --ink-2:#3B4657; --muted:#6E7A90;
  --line:#D9E0EA; --accent:#2F7FBF; --accent-ink:#1F5E90; --accent-soft:#E3F1FB; --tick:#B9C6D8;
  --sidebar:#EEF2F7; --shadow:0 1px 2px rgba(20,25,34,.06), 0 8px 24px rgba(20,25,34,.05);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --ground:#0A0A0B; --paper:#131314; --ink:#EDEDEF; --ink-2:#C4C4C7; --muted:#8C8C91;
    --line:#282829; --accent:#7FC7EE; --accent-ink:#AEE8FF; --accent-soft:#1B1B1D; --tick:#3A3A3C;
    --sidebar:#0E0E0F; --shadow:0 1px 2px rgba(0,0,0,.5), 0 8px 24px rgba(0,0,0,.4);
  }
}
:root[data-theme="dark"]{
  --ground:#0A0A0B; --paper:#131314; --ink:#EDEDEF; --ink-2:#C4C4C7; --muted:#8C8C91;
  --line:#282829; --accent:#7FC7EE; --accent-ink:#AEE8FF; --accent-soft:#1B1B1D; --tick:#3A3A3C;
  --sidebar:#0E0E0F; --shadow:0 1px 2px rgba(0,0,0,.5), 0 8px 24px rgba(0,0,0,.4);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:24px}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--ground);color:var(--ink);
  font-family:"Source Serif 4",Georgia,"Times New Roman",serif;font-size:17px;line-height:1.62}
a{color:var(--accent-ink);text-decoration:none;border-bottom:1px solid transparent}
a:hover,a:focus-visible{border-bottom-color:var(--accent-ink)}
a:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}
.skip{position:absolute;left:-9999px;top:0;background:var(--paper);color:var(--ink);padding:10px 14px;
  border:1px solid var(--line);border-radius:0 0 8px 0;z-index:60}
.skip:focus{left:0}

.shell{display:grid;grid-template-columns:286px minmax(0,1fr);min-height:100vh}
.side{background:var(--sidebar);border-right:1px solid var(--line);padding:26px 20px 40px;
  position:sticky;top:0;height:100vh;overflow:auto}
.brandrow{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}
.brand{font-family:"Bricolage Grotesque","Source Sans 3",system-ui,sans-serif;font-weight:700;
  font-size:21px;letter-spacing:-.01em;margin:0;color:var(--ink)}
.brand a{color:inherit;border:0}
.brand small{display:block;font-family:"Source Sans 3",system-ui,sans-serif;font-weight:400;font-size:11.5px;
  letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-top:5px}
.themebtn{flex:none;background:transparent;border:1px solid var(--line);color:var(--muted);
  border-radius:7px;width:30px;height:30px;cursor:pointer;font-size:14px;line-height:1;
  font-family:"Source Sans 3",system-ui,sans-serif}
.themebtn:hover{color:var(--ink);border-color:var(--muted)}

.search{margin:20px 0 6px;position:relative}
.sr{position:absolute;left:-9999px}
.search input{width:100%;font-family:"Source Sans 3",system-ui,sans-serif;font-size:14.5px;
  padding:9px 11px;border:1px solid var(--line);border-radius:9px;background:var(--paper);color:var(--ink)}
.search input:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
.kbd{position:absolute;right:9px;top:9px;font-family:"Source Sans 3",system-ui,sans-serif;font-size:11px;
  color:var(--muted);border:1px solid var(--line);border-radius:4px;padding:1px 5px;pointer-events:none;background:var(--ground)}
.search input:focus + .kbd{display:none}
.hits{list-style:none;margin:10px 0 0;padding:0;display:flex;flex-direction:column;gap:2px;max-height:62vh;overflow:auto}
.hits li a{display:block;padding:8px 9px;border-radius:7px;color:var(--ink);
  font-family:"Source Sans 3",system-ui,sans-serif;font-size:14px;line-height:1.35;border-bottom:0}
.hits li a:hover,.hits li a:focus-visible{background:var(--accent-soft)}
.hits .where{display:block;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);
  margin-bottom:3px;font-variant-numeric:tabular-nums}
.hits .snip{display:block;color:var(--ink-2);font-size:13px;margin-top:3px}
.hits mark{background:transparent;color:var(--accent-ink);font-weight:600}
.hits .none{padding:8px 9px;color:var(--muted);font-family:"Source Sans 3",system-ui,sans-serif;font-size:14px}
.side.searching .contents{display:none}

.contents{margin-top:22px}
.contents h2{font-family:"Source Sans 3",system-ui,sans-serif;font-size:11.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--muted);margin:0 0 10px;font-weight:600}
.contents ol{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:1px}
.contents li a{display:flex;gap:10px;align-items:baseline;padding:6px 9px;border-radius:7px;color:var(--ink-2);
  font-family:"Source Sans 3",system-ui,sans-serif;font-size:14.5px;line-height:1.35;border-bottom:0}
.contents li a .n{font-variant-numeric:tabular-nums;color:var(--muted);font-size:12px;min-width:19px}
.contents li a:hover{background:var(--accent-soft);color:var(--ink)}
.contents li a.current{background:var(--accent-soft);color:var(--ink);font-weight:600}
.contents li a.current .n{color:var(--accent-ink)}

.page{display:grid;grid-template-columns:minmax(0,1fr) 200px;gap:56px;
  padding:52px 52px 110px;max-width:1340px}
.page.norail{grid-template-columns:minmax(0,1fr);max-width:1000px}
main{min-width:0}
.rail{position:sticky;top:52px;align-self:start;font-family:"Source Sans 3",system-ui,sans-serif}
.rail h2{font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 10px;font-weight:600}
.rail ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:1px}
.rail a{display:block;padding:4px 0 4px 11px;border-left:2px solid var(--line);color:var(--muted);
  font-size:13.5px;line-height:1.4;border-bottom:0}
.rail a:hover{color:var(--ink)}
.rail a.current{color:var(--accent-ink);border-left-color:var(--accent)}
.rail a.lvl3{padding-left:22px;font-size:13px}

.eyebrow{font-family:"Source Sans 3",system-ui,sans-serif;font-size:11.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--muted);margin:0 0 8px;font-variant-numeric:tabular-nums}
h1{font-family:"Bricolage Grotesque","Source Sans 3",system-ui,sans-serif;font-weight:700;font-size:41px;
  line-height:1.05;letter-spacing:-.022em;margin:0 0 26px;text-wrap:balance}
h2{font-family:"Bricolage Grotesque","Source Sans 3",system-ui,sans-serif;font-weight:600;font-size:24px;
  line-height:1.2;letter-spacing:-.01em;margin:44px 0 12px;text-wrap:balance;scroll-margin-top:20px}
h3{font-family:"Source Sans 3",system-ui,sans-serif;font-weight:600;font-size:15.5px;letter-spacing:.03em;
  margin:28px 0 8px;color:var(--ink-2);text-transform:uppercase;scroll-margin-top:20px}
.anchor{opacity:0;margin-left:8px;color:var(--muted);font-weight:400;border:0;font-size:.7em}
h2:hover .anchor,h3:hover .anchor,.anchor:focus{opacity:1}
p{margin:0 0 15px;max-width:70ch}
ul,ol{margin:0 0 17px;padding-left:23px;max-width:70ch}
li{margin:0 0 7px}
li::marker{color:var(--muted)}
strong{font-weight:600}
.tc{font-family:"Source Sans 3",system-ui,sans-serif;font-variant-numeric:tabular-nums;letter-spacing:.04em;
  background:var(--accent-soft);padding:1px 5px;border-radius:4px;font-size:.92em}
/* Screenshots carry fine UI detail, so figures are allowed to run wider than the
   text measure. The text itself stays at 70ch for readability. */
.shot{margin:24px 0 28px;max-width:940px}
.shot img{display:block;max-width:100%;height:auto;border:1px solid var(--line);border-radius:7px;background:#121213}
.shot figcaption{font-family:"Source Sans 3",system-ui,sans-serif;font-size:13.5px;color:var(--muted);
  margin-top:9px;line-height:1.45;max-width:70ch}
.missing{color:#b00;font-family:monospace}

.pager{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:64px;padding-top:28px;border-top:1px solid var(--line)}
.pager a{display:block;padding:14px 16px;border:1px solid var(--line);border-radius:10px;background:var(--paper);
  font-family:"Source Sans 3",system-ui,sans-serif;box-shadow:var(--shadow)}
.pager a:hover{border-color:var(--accent);border-bottom-color:var(--accent)}
.pager .dir{display:block;font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.pager .ttl{display:block;font-size:15.5px;color:var(--ink);font-weight:600;line-height:1.3}
.pager .next{text-align:right}
.pager .spacer{border:0;background:transparent;box-shadow:none}

.hero{margin:0 0 46px}
.hero p.lead{font-size:20px;line-height:1.5;color:var(--ink-2);max-width:62ch;margin:0}
/* max-width:none is load-bearing: .grid is a <ul>, and the ul,ol rule above caps
   lists at the 70ch prose measure, which would hold the cards to two columns. */
.grid{list-style:none;margin:0 0 12px;padding:0;max-width:none;display:grid;
  grid-template-columns:repeat(auto-fill,minmax(228px,1fr));gap:12px}
.grid a{display:block;height:100%;padding:15px 16px;border:1px solid var(--line);border-radius:10px;
  background:var(--paper);font-family:"Source Sans 3",system-ui,sans-serif;box-shadow:var(--shadow)}
.grid a:hover{border-color:var(--accent);border-bottom-color:var(--accent)}
.grid .n{display:block;font-size:11.5px;letter-spacing:.1em;color:var(--muted);margin-bottom:5px;font-variant-numeric:tabular-nums}
.grid .ttl{display:block;font-size:16px;color:var(--ink);font-weight:600;line-height:1.3}
.startbox{margin-top:40px;padding:22px 24px;border:1px solid var(--line);border-radius:12px;background:var(--paper);box-shadow:var(--shadow)}
.startbox h2{margin-top:0;font-size:20px}
.startbox p:last-child{margin-bottom:0}

.mobilebar{display:none}
@media (max-width:1080px){
  .page{grid-template-columns:minmax(0,1fr);gap:0;padding:44px 36px 90px}
  .rail{display:none}
}
@media (max-width:860px){
  .shell{grid-template-columns:1fr}
  .side{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line);padding:18px 20px 22px}
  .contents{margin-top:16px}
  .contents .fold{max-height:0;overflow:hidden;transition:max-height .2s ease}
  .side.open .contents .fold{max-height:2000px}
  .mobilebar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:14px}
  .mobilebar button{font-family:"Source Sans 3",system-ui,sans-serif;font-size:13px;letter-spacing:.1em;
    text-transform:uppercase;color:var(--muted);background:transparent;border:1px solid var(--line);
    border-radius:8px;padding:7px 12px;cursor:pointer}
  .page{padding:30px 20px 70px}
  h1{font-size:31px}
  h2{font-size:21px}
  .pager{grid-template-columns:1fr}
  .pager .next{text-align:left}
}
@media print{
  .side,.rail,.pager,.skip{display:none}
  .page{grid-template-columns:1fr;padding:0;max-width:none}
  body{background:#fff;color:#000;font-size:11pt}
  .shot img{border-color:#bbb}
}