:root {
  --ink: #14211c;
  --ink-2: #4a5a53;
  --line: #e2e8e4;
  --bg: #fbfcfa;
  --panel: #f1f5f2;
  --brand: #0f3d2e;
  --accent: #1f8a5b;
  --accent-soft: #e3f3ea;
  --max: 72rem;
  --read: 42rem;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 1.0625rem/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}
img, svg, video { max-width: 100%; height: auto; }
a { color: var(--accent); text-underline-offset: .18em; }
a:hover { color: var(--brand); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 3px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1rem; }
@media (min-width: 40rem) { .wrap { padding: 0 1.5rem; } }

.skip { position: absolute; left: -999px; top: 0; background: var(--brand); color: #fff; padding: .6rem 1rem; z-index: 10; }
.skip:focus { left: 0; }

/* header + footer */
.site-head { border-bottom: 1px solid var(--line); background: #fff; position: relative; z-index: 30; }
.brand { display: inline-flex; align-items: center; gap: .6rem; color: var(--brand); text-decoration: none; font-weight: 700; letter-spacing: -.01em; font-size: 1.05rem; flex: none; }
.brand:hover { color: var(--brand); }
.head-in { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 4rem; position: relative; }
.site-nav { display: flex; align-items: center; gap: .25rem; }
.dd { position: relative; }
.dd-btn, .nav-link { font: inherit; font-size: .95rem; color: var(--ink-2); background: none; border: 0; padding: .55rem .7rem; border-radius: 8px; cursor: pointer; display: inline-flex; align-items: center; gap: .3rem; text-decoration: none; }
.dd-btn:hover, .nav-link:hover, .dd.open .dd-btn { color: var(--brand); background: var(--panel); }
.dd-btn svg { transition: transform .15s; }
.dd.open .dd-btn svg { transform: rotate(180deg); }
.dd-panel { display: none; position: absolute; top: calc(100% + 6px); left: 0; z-index: 20; background: #fff; border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 12px 32px rgba(15, 61, 46, .12); padding: 1rem 1.1rem .9rem; min-width: 16rem; }
.dd-panel.multi { display: none; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); gap: .25rem 1.5rem; width: max-content; max-width: min(46rem, calc(100vw - 2rem)); }
.dd:last-of-type .dd-panel { left: auto; right: 0; }
.dd.open > .dd-panel { display: block; }
.dd.open > .dd-panel.multi { display: grid; }
@media (hover: hover) and (min-width: 56rem) {
  .dd:hover > .dd-panel { display: block; }
  .dd:hover > .dd-panel.multi { display: grid; }
  .dd:hover .dd-btn { color: var(--brand); background: var(--panel); }
}
.dd-col { min-width: 0; }
.dd-h { font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-2); margin: .2rem 0 .35rem; font-weight: 600; }
.dd-panel ul { list-style: none; margin: 0 0 .5rem; padding: 0; }
.dd-panel li a { display: block; padding: .3rem .4rem; margin: 0 -.4rem; border-radius: 6px; color: var(--ink); text-decoration: none; font-size: .92rem; line-height: 1.35; }
.dd-panel li a:hover { background: var(--accent-soft); color: var(--brand); }
.dd-all { grid-column: 1 / -1; display: block; border-top: 1px solid var(--line); padding-top: .65rem; margin-top: .25rem; font-weight: 600; font-size: .92rem; text-decoration: none; }
.nav-toggle { display: none; font: inherit; font-weight: 600; color: var(--brand); background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: .45rem .85rem; cursor: pointer; }
@media (max-width: 55.99rem) {
  .nav-toggle { display: inline-block; }
  .site-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; z-index: 20; flex-direction: column; align-items: stretch; background: #fff; border: 1px solid var(--line); border-radius: 0 0 14px 14px; padding: .5rem; box-shadow: 0 12px 32px rgba(15, 61, 46, .12); max-height: calc(100vh - 5rem); overflow-y: auto; }
  .site-nav.open { display: flex; }
  .dd-btn, .nav-link { width: 100%; justify-content: space-between; padding: .7rem .8rem; }
  .dd-panel, .dd-panel.multi, .dd:last-of-type .dd-panel { position: static; box-shadow: none; border: 0; border-radius: 0; padding: .25rem .8rem .75rem; width: auto; max-width: none; min-width: 0; grid-template-columns: 1fr; }
}

/* author */
.byline { display: flex; align-items: center; gap: .65rem; font-size: .9rem; color: var(--ink-2); margin: 1.1rem 0 0; }
.byline a { font-weight: 600; text-decoration: none; }
.avatar { border-radius: 50%; display: block; object-fit: cover; background: var(--panel); }
.author-box { display: flex; gap: 1.1rem; align-items: flex-start; background: var(--panel); border-radius: 14px; padding: 1.25rem 1.35rem; margin: 3rem 0 0; }
.author-box .avatar { width: 88px; height: 88px; flex: none; }
.author-box p { margin: 0 0 .6rem; font-size: .97rem; color: var(--ink-2); }
.author-box .author-name { font-weight: 700; color: var(--ink); font-size: 1.05rem; }
.author-box .author-name a { text-decoration: none; }
@media (max-width: 30rem) { .author-box { flex-direction: column; } }
.socials { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .4rem .5rem; }
.socials a { display: inline-flex; align-items: center; gap: .35rem; font-size: .85rem; font-weight: 600; text-decoration: none; color: var(--brand); background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: .3rem .75rem; }
.socials a:hover { border-color: var(--accent); }
.socials.big a { font-size: .95rem; padding: .45rem .95rem; }
.socials.small a { background: transparent; }
.hero-author { display: inline-flex; align-items: center; gap: .75rem; margin-top: 1.5rem; text-decoration: none; color: var(--ink-2); font-size: .92rem; line-height: 1.35; }
.hero-author img { border-radius: 50%; }
.hero-author strong { display: block; color: var(--brand); }
.about-hero { display: flex; gap: 1.5rem; align-items: center; margin: 0 0 1.5rem; }
.about-hero img { border-radius: 50%; width: 140px; height: 140px; flex: none; }
@media (max-width: 30rem) { .about-hero { flex-direction: column; align-items: flex-start; } }

.site-foot { border-top: 1px solid var(--line); margin-top: 5rem; color: var(--ink-2); font-size: .9rem; }
.foot-in { padding-top: 1.75rem; padding-bottom: 2rem; display: grid; gap: 1rem; }
.foot-in a { color: inherit; }
.foot-author { display: flex; gap: .85rem; align-items: center; max-width: 42rem; }
.foot-author p { margin: 0; }
.foot-author .avatar { width: 48px; height: 48px; flex: none; }
.copy { margin: 0; font-size: .82rem; }

/* home */
.hero { padding: 4.5rem 0 3rem; background: linear-gradient(180deg, var(--accent-soft), var(--bg)); }
.hero h1 {
  font-family: var(--serif); font-weight: 700; letter-spacing: -.02em; line-height: 1.1;
  font-size: clamp(2.2rem, 5.5vw, 3.6rem); margin: 0 0 1rem; max-width: 18ch; color: var(--brand);
}
.lede { font-size: clamp(1.1rem, 2vw, 1.3rem); color: var(--ink-2); max-width: 38rem; margin: 0; }
.guides { padding-top: 2.5rem; }
.guides > h2 { font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-2); margin: 0 0 1rem; }
.empty { border: 1px dashed var(--line); border-radius: 12px; padding: 1.5rem; color: var(--ink-2); background: #fff; margin: 0; }
.guide-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr)); }
.guide-list a { display: block; height: 100%; padding: 1.25rem 1.35rem; background: #fff; border: 1px solid var(--line); border-radius: 12px; text-decoration: none; color: inherit; transition: border-color .15s, transform .15s; }
.guide-list a:hover { border-color: var(--accent); transform: translateY(-2px); }
.guide-list h3 { margin: 0 0 .4rem; font-size: 1.15rem; line-height: 1.3; color: var(--brand); }
.guide-list p { margin: 0; color: var(--ink-2); font-size: .95rem; }

/* article */
.article { max-width: calc(var(--read) + 3rem); padding-top: 2rem; }
.crumbs { font-size: .875rem; color: var(--ink-2); }
.crumbs a { color: var(--ink-2); }
.article-head h1 { font-family: var(--serif); font-size: clamp(2rem, 5vw, 3rem); line-height: 1.12; letter-spacing: -.02em; margin: 1rem 0 .75rem; color: var(--brand); }
.meta { font-size: .875rem; color: var(--ink-2); margin: 1rem 0 0; }
.toc { background: var(--panel); border-radius: 12px; padding: 1.1rem 1.4rem; margin: 2rem 0; }
.toc h2 { font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; margin: 0 0 .5rem; color: var(--ink-2); }
.toc ol { margin: 0; padding-left: 1.2rem; }
.toc li { margin: .2rem 0; }

.prose { font-size: 1.125rem; }
.prose h2 { font-family: var(--serif); font-size: 1.75rem; line-height: 1.2; margin: 2.75rem 0 .75rem; color: var(--brand); scroll-margin-top: 1rem; }
.prose h3 { font-size: 1.25rem; margin: 2rem 0 .5rem; scroll-margin-top: 1rem; }
.prose p, .prose ul, .prose ol { margin: 0 0 1.25rem; }
.prose li { margin: .35rem 0; }
.prose blockquote { margin: 1.5rem 0; padding: .25rem 0 .25rem 1.25rem; border-left: 4px solid var(--accent); color: var(--ink-2); }
.prose code { font: .9em var(--mono); background: var(--panel); padding: .1em .35em; border-radius: 4px; }
.prose pre { background: var(--ink); color: #e9f0ec; padding: 1rem 1.25rem; border-radius: 10px; overflow-x: auto; }
.prose pre code { background: none; padding: 0; color: inherit; }
.prose table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: 1rem; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; padding: .6rem .75rem; border-bottom: 1px solid var(--line); }
.prose th { background: var(--panel); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.5rem 0; }

.guides-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; margin: 0 0 1rem; }
.guides-head h2 { margin: 0 !important; }
.guides-head a { font-size: .9rem; font-weight: 600; text-decoration: none; }
.article.wide { max-width: var(--max); }
.article.wide .prose, .article.wide .article-head { max-width: var(--read); }
.hub-list { margin-top: 2.5rem; }
.hub-list h2, .related h2 { font-family: var(--serif); font-size: 1.5rem; color: var(--brand); margin: 0 0 1rem; }
.related { margin-top: 3.5rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.related .guide-list { grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); }
.hub-back { margin: 1.25rem 0 0; font-weight: 600; }
.hub-back a { text-decoration: none; }
.disclosure { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: .9rem 1.2rem; margin: 1.5rem 0; font-size: .95rem; color: var(--ink-2); }
.disclosure strong { color: var(--ink); }
.verdict { background: var(--accent-soft); border-radius: 12px; padding: 1.1rem 1.35rem; margin: 1.75rem 0; }
.verdict > :last-child { margin-bottom: 0; }

/* diagrams: wrap inline SVG or images in <figure class="diagram"> */
.prose figure { margin: 2rem 0; }
.diagram { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 1.25rem; }
.diagram svg, .diagram img { display: block; width: 100%; height: auto; margin: 0 auto; }
.prose figcaption { font-size: .9rem; color: var(--ink-2); margin-top: .75rem; text-align: center; }

/* callouts: <aside class="callout"> or <aside class="callout warn"> */
.callout { background: var(--accent-soft); border-radius: 12px; padding: 1rem 1.25rem; margin: 1.75rem 0; }
.callout.warn { background: #fff4e0; }
.callout > :last-child { margin-bottom: 0; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }