/* Guide-scoped styles. No workspace bundle, external illustrations or article JS. */
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;min-height:100dvh;display:flex;flex-direction:column;-webkit-font-smoothing:antialiased;overflow-wrap:break-word}
a{color:inherit;text-decoration:none;-webkit-tap-highlight-color:transparent}
button{font:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent}
[hidden]{display:none!important}
:focus-visible{outline:1px solid var(--fg);outline-offset:3px}
.skip-link{position:absolute;left:16px;top:-48px;padding:10px 14px;background:var(--tile2);color:var(--fg);border:1px solid var(--muted);border-radius:3px;font:500 13px var(--mono);z-index:5}
.skip-link:focus{top:12px}
main{width:100%;max-width:1600px;margin:0 auto;padding:0 32px;flex:1}
.site-footer{max-width:1600px;width:100%;margin:auto;padding:18px 32px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px 20px;font-size:12px;color:var(--muted);border-top:1px solid var(--line)}
.site-footer a{padding:10px 0;display:inline-block}
.site-footer a:hover{color:var(--fg)}
.site-footer div{display:flex;gap:18px}
.eyebrow{font:500 10.5px var(--mono);letter-spacing:.12em;color:var(--muted);margin:0 0 8px;text-transform:uppercase}
h1,h2,h3{text-wrap:balance}

/* The library puts all six choices above the fold on a normal desktop. */
.library{max-width:1040px;margin:0 auto;padding:28px 0 32px}
.library h1{font-family:var(--serif);margin-inline:0}
.library .lead{font-size:16px;line-height:1.5;color:var(--muted);margin:0 0 20px;text-wrap:pretty}
.library-controls{display:flex;align-items:center;gap:8px;padding:4px;margin:0 -4px 16px}
.library-controls.is-hidden{display:none}
.js-ready .library-controls.is-hidden{display:flex}
.search-field{flex:0 0 clamp(160px,22vw,240px)}
.search-field label,.topic-filter legend{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.search-field input{width:100%;min-height:44px;padding:10px 12px;border:1px solid var(--line);border-radius:3px;background:var(--bg);color:var(--fg);font:inherit;font-size:16px}
.search-field input::placeholder{color:var(--muted)}
.search-field input:focus-visible{outline-offset:2px;border-color:var(--accent)}
.topic-filter{flex:1;min-width:44px;border:0;padding:0;margin:0;overflow-x:auto;scroll-padding-inline:4px}
.chips{display:flex;flex-wrap:nowrap;gap:6px;padding:4px}
.chip{position:relative;display:inline-flex;flex:none;white-space:nowrap}
.chip input{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:pointer}
.chip span{display:inline-flex;align-items:center;min-height:40px;padding:6px 11px;border:1px solid var(--line);border-radius:3px;font-size:13px;color:var(--muted);background:var(--bg)}
.chip:hover span{border-color:var(--muted);color:var(--fg)}
.chip input:checked+span{border-color:var(--muted);color:var(--fg);background:var(--tile2)}
.chip input:focus+span{outline:1px solid var(--fg);outline-offset:3px}
.controls-foot{flex:none;display:flex;align-items:center;gap:12px;font-size:12px;color:var(--muted);white-space:nowrap}
/* Keep the result row's geometry at rest, without exposing inactive controls. */
.controls-foot[hidden]{display:flex!important;visibility:hidden}
.controls-foot p{margin:0;font-variant-numeric:tabular-nums}
.secondary{min-height:40px;padding:8px 12px;border:1px solid var(--line);border-radius:3px;background:transparent;color:var(--fg);font:12.5px var(--mono)}
.secondary:hover{border-color:var(--muted)}
.guide-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.guide-list>li{padding:14px 16px;border:1px solid var(--line);border-radius:3px;background:var(--surface)}
.guide-entry{display:grid;grid-template-columns:24px minmax(0,1fr);gap:12px;align-items:start}
.guide-number{font-family:var(--mono);font-size:11px;color:var(--muted);padding-top:12px}
.guide-entry h2{font:500 20px/1.2 var(--serif);letter-spacing:-.01em;margin:0}
.guide-entry h2 a{display:inline-flex;align-items:center;min-height:44px;padding:6px 0}
.guide-entry h2 a:hover{color:var(--accent);text-decoration:underline;text-underline-offset:4px}
.guide-entry p{font-size:14px;line-height:1.45;color:var(--muted);margin:2px 0 10px;text-wrap:pretty}
.guide-meta{display:flex;flex-wrap:wrap;gap:6px 12px;list-style:none;padding:0;margin:0;font-family:var(--mono);font-size:11px;color:var(--muted)}
.empty-state{border:1px dashed var(--line);border-radius:3px;padding:24px;text-align:center}
.empty-state h2{font:500 21px var(--serif);margin:0 0 8px}
.empty-state p{color:var(--muted);margin:0 0 16px;line-height:1.5}
.library-foot{margin-top:16px;font-size:13px;line-height:1.5;color:var(--muted)}
.library-foot p{margin:0}
.library-foot a{color:var(--accent);text-decoration:underline;text-underline-offset:4px}

/* Short lessons: readable type, compact sections, one useful diagram. */
.guide{max-width:720px;margin:0 auto;padding:30px 0 40px;font-size:16px;line-height:1.6}
.guide-head{margin-bottom:22px}
.guide h1{font-family:var(--serif);margin-inline:0}
.guide .lead{font-size:18px;line-height:1.5;color:var(--muted);margin:0 0 12px;text-wrap:pretty}
.guide-facts{display:flex;flex-wrap:wrap;gap:8px 18px;font-family:var(--mono);font-size:11px;color:var(--muted);margin:0;padding:0;list-style:none}
.guide h2{font:500 23px/1.3 var(--serif);letter-spacing:-.01em;margin:24px 0 10px}
.guide p{margin:0 0 12px}
.guide a{color:var(--accent);text-decoration:underline;text-underline-offset:4px}
.guide a:hover{text-decoration-thickness:2px}
.guide strong{font-weight:650;color:var(--fg)}
.guide code{font-family:var(--mono);font-size:.86em;background:var(--surface);border:1px solid var(--line);border-radius:4px;padding:1px 4px}
.guide pre{white-space:pre-wrap;overflow-wrap:anywhere;background:var(--surface);border:1px solid var(--line);border-radius:3px;padding:12px 14px;margin:0 0 6px;font:13px/1.65 var(--mono);color:var(--fg)}
.guide pre code{background:none;border:0;padding:0;font-size:inherit}
.command{margin:0 0 16px}
.command p{font-size:15px;line-height:1.5;color:var(--muted)}
.diagram{max-width:430px;margin:20px auto;padding:10px;border:1px solid var(--line);border-radius:3px;background:var(--surface)}
.diagram svg{display:block;width:100%;height:auto;overflow:visible}
.diagram rect{fill:var(--bg);stroke:var(--muted);stroke-width:1.4}
.diagram rect.good{stroke:var(--green)}
.diagram rect.bad{stroke:var(--red)}
.diagram text{fill:var(--fg);font:16px var(--sans);text-anchor:middle}
.diagram text.detail{font-size:15px;fill:var(--soft)}
.diagram .flow{fill:none;stroke:var(--accent);stroke-width:1.5}
.diagram marker path{fill:var(--accent)}
.diagram figcaption{font-size:12px;color:var(--muted);line-height:1.45;margin:8px 4px 2px}
.self-check{list-style:none;padding:0;margin:0}
.self-check .check-question{margin:0 0 8px;font-size:16px;line-height:1.5}
.self-check details{border:1px solid var(--line);border-radius:3px;background:var(--surface)}
.self-check summary{cursor:pointer;padding:12px 14px;font:500 13px var(--mono);line-height:1.5;list-style-position:inside}
.self-check summary::marker{color:var(--accent)}
.self-check summary:hover{color:var(--accent)}
.self-check details[open] summary{border-bottom:1px solid var(--line)}
.self-check .answer{padding:12px 14px;font-size:15px;line-height:1.5;color:var(--muted)}
.self-check .answer p:last-child{margin-bottom:0}
.references{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:2px 18px}
.references li{font-size:13px;line-height:1.5}
.references a{display:inline-block;padding:6px 0}
.practice-links{display:flex;flex-wrap:wrap;gap:4px 20px;font-size:15px}
.practice-links a{display:inline-flex;align-items:center;min-height:44px}
.guide-nav{display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px 18px;margin-top:20px;padding-top:12px;border-top:1px solid var(--line);font-size:13px}
.guide-nav a{padding:10px 0;display:inline-flex;align-items:center;min-height:44px}

@media(min-width:1024px){
  .library-controls{display:grid;grid-template-columns:clamp(160px,22vw,240px) minmax(0,1fr);align-items:start}
  .js-ready .library-controls.is-hidden{display:grid}
  .topic-filter{grid-column:2;grid-row:1 / span 2;overflow:visible}
  .chips{flex-wrap:wrap}
  .controls-foot{grid-column:1;grid-row:2}
}
@media(max-width:760px){
  main{padding:0 16px}
  .site-footer{padding:14px 16px}
  .library,.guide{padding:22px 0 32px}
  .library-controls{flex-wrap:wrap}
  .controls-foot{flex-basis:100%;justify-content:flex-end;gap:8px}
  .guide-list{grid-template-columns:1fr;gap:10px}
  .guide-list>li{padding:10px 12px}
  .guide-entry{grid-template-columns:22px minmax(0,1fr);gap:8px}
  .guide-entry h2{font-size:18px}
  .guide-entry p{font-size:14px;margin-bottom:8px}
  .guide{font-size:16px}
  .guide .lead{font-size:17px}
  .guide pre{padding:10px;font-size:12.5px}
}