/* ==========================================================================
   OSS Networks — shared stylesheet
   One file for the whole site. Add a publication by creating a folder with an
   index.html that links this stylesheet; no CSS changes required.
   ========================================================================== */

:root{
  /* ink */
  --ink:#151a21;
  --ink-soft:#48525d;
  --ink-faint:#636c77;
  /* surfaces */
  --bg:#fafbfc;
  --bg-panel:#eef2f7;
  --rule:#dde3ea;
  /* plate cream — matches the drafting-paper ground of the illustrations */
  --plate-bg:#f7f3ea;
  --plate-rule:#e3dccd;
  /* blue */
  --accent:#1a4f96;
  --accent-soft:#e6edf8;
  /* status */
  --draft:#755b2f;
  --measure:34rem;
}
@media (prefers-color-scheme: dark){
  :root{
    --ink:#e6eaef;
    --ink-soft:#a3adb8;
    --ink-faint:#8b95a1;
    --bg:#11151b;
    --bg-panel:#1a2029;
    --rule:#28313c;
    --plate-bg:#1a2029;
    --plate-rule:#28313c;
    --accent:#7cb0ea;
    --accent-soft:#17263a;
    --draft:#c2a06a;
  }
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font:400 17px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  font-feature-settings:"kern","liga";
  -webkit-font-smoothing:antialiased;
}
/* keep the footer at the bottom on short pages (contact, 404) */
body{min-height:100vh;display:flex;flex-direction:column}
body > main{flex:1 0 auto}
body > footer{margin-top:auto}
.wrap{max-width:46rem;margin:0 auto;padding:0 1.5rem}
h1,h2,h3,.serif{
  font-family:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
  font-weight:600;
  letter-spacing:-0.01em;
}
a{color:var(--accent);text-decoration:none;border-bottom:1px solid color-mix(in srgb, var(--accent) 35%, transparent)}
a:hover{border-bottom-color:var(--accent)}
a.plain,a.plain:hover{border-bottom:none}
img{max-width:100%;height:auto}
hr{border:none;border-top:1px solid var(--rule);margin:2.5rem 0}
.eyebrow{
  font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-faint);font-weight:600;margin:0 0 .35rem;
}
.skip{position:absolute;left:-9999px}
.skip:focus{left:1rem;top:1rem;background:var(--bg-panel);padding:.5rem .9rem;border-radius:4px;z-index:10}

/* ---------- masthead ---------- */
.topbar{height:4px;background:var(--accent)}
header.mast{padding:4.5rem 0 3rem;border-bottom:1px solid var(--rule)}
header.mast .eyebrow{color:var(--accent)}
header.mast h1{font-size:2.6rem;line-height:1.1;margin:0 0 1.4rem}
header.mast .lede{font-size:1.18rem;line-height:1.6;max-width:var(--measure);margin:0 0 1.6rem}
.meta{font-size:.9rem;color:var(--ink-faint);display:flex;flex-wrap:wrap;gap:.35rem 1.1rem;margin:0}

/* site nav — one line, grows with the library */
.sitenav{border-bottom:1px solid var(--rule);background:var(--bg)}
.sitenav .wrap{display:flex;flex-wrap:wrap;gap:.4rem 1.4rem;align-items:baseline;padding-top:.9rem;padding-bottom:.9rem}
.sitenav a{
  font-size:.85rem;font-weight:600;letter-spacing:.02em;color:var(--ink-soft);border-bottom:none;
}
.sitenav a:hover{color:var(--accent)}
.sitenav .home{font-family:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;font-size:1rem;color:var(--ink);margin-right:auto}

/* ---------- sections ---------- */
section{padding:3.5rem 0;border-bottom:1px solid var(--rule)}
section:last-of-type{border-bottom:none}
section > .wrap > h2{font-size:1.65rem;margin:.4rem 0 1rem;line-height:1.2}
.section-intro{color:var(--ink-soft);max-width:var(--measure);margin:0 0 2rem}

/* ---------- pillar list ---------- */
ol.pillars{list-style:none;counter-reset:p;margin:0;padding:0}
ol.pillars li{
  counter-increment:p;
  display:grid;grid-template-columns:2.6rem 1fr;gap:0 1rem;
  padding:1rem 0;border-top:1px solid var(--rule);
}
ol.pillars li:first-child{border-top:none}
ol.pillars li::before{
  content:counter(p,decimal-leading-zero);
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:.85rem;color:var(--accent);padding-top:.28rem;letter-spacing:.02em;
}
ol.pillars .name{font-weight:600;display:block;margin-bottom:.15rem}
ol.pillars .desc{color:var(--ink-soft);font-size:.97rem;display:block}
ol.pillars .name a{color:inherit;border-bottom:1px solid color-mix(in srgb, var(--accent) 45%, transparent)}
ol.pillars .name a:hover{color:var(--accent);border-bottom-color:var(--accent)}

/* ---------- library ---------- */
.library{list-style:none;margin:0;padding:0}
.library > li{padding:1.6rem 0;border-top:1px solid var(--rule)}
.library > li:first-child{border-top:none;padding-top:.25rem}
.library h3{font-size:1.3rem;margin:.15rem 0 .5rem;line-height:1.25}
.library h3 a{color:inherit;border-bottom:1px solid color-mix(in srgb, var(--accent) 45%, transparent)}
.library h3 a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.library p{margin:0 0 .7rem;color:var(--ink-soft);max-width:var(--measure)}
.library .entry-meta{font-size:.85rem;color:var(--ink-faint);display:flex;flex-wrap:wrap;gap:.3rem .9rem;margin:0}
.library .lead{display:grid;grid-template-columns:9rem 1fr;gap:1.6rem;align-items:start}
.library .lead .thumb{
  border:1px solid var(--plate-rule);border-radius:3px;background:var(--plate-bg);
  padding:.4rem;display:block;
}
.library .lead .thumb img{display:block;border-radius:1px}
.library-note{color:var(--ink-faint);font-size:.95rem;max-width:var(--measure);margin:1.4rem 0 0;padding-top:1.2rem;border-top:1px solid var(--rule)}
.tag{
  display:inline-block;font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;
  font-weight:700;padding:.16rem .5rem;border-radius:2px;vertical-align:.1em;
}
.tag-live{color:var(--accent);background:var(--accent-soft)}
.tag-draft{color:var(--draft);background:color-mix(in srgb, var(--draft) 12%, transparent)}
@media (max-width:600px){
  .library .lead{grid-template-columns:1fr;gap:1rem}
  .library .lead .thumb{max-width:8rem}
}

/* ---------- article ---------- */
article{max-width:var(--measure)}
article.full{max-width:none}
.doc h2{font-size:1.75rem;margin:3.2rem 0 .6rem;line-height:1.2;padding-bottom:.5rem;border-bottom:2px solid var(--accent)}
.doc h2:first-child{margin-top:0}
.doc h3{font-size:1.2rem;margin:2.2rem 0 .6rem;line-height:1.3}
.doc h4{font-size:.95rem;margin:1.8rem 0 .5rem;font-weight:700;font-family:inherit;letter-spacing:-0.005em}
.doc p{max-width:var(--measure);margin:0 0 1.05rem}
.doc ul,.doc ol{max-width:var(--measure);margin:0 0 1.05rem;padding-left:1.2rem}
.doc li{margin:.4rem 0}
.doc dl{margin:0 0 1.05rem;max-width:var(--measure)}
.doc dt{font-weight:700;margin:.9rem 0 .15rem}
.doc dd{margin:0;color:var(--ink-soft)}
.doc strong{font-weight:700}

/* article header block */
.doc-head{padding:3.25rem 0 2.25rem;border-bottom:1px solid var(--rule)}
.doc-head h1{font-size:2.4rem;line-height:1.12;margin:0 0 .9rem}
.doc-head .subtitle{
  font-family:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  font-style:italic;font-size:1.2rem;color:var(--ink-soft);
  max-width:var(--measure);margin:0 0 1.5rem;
}
.doc-head .meta{margin-bottom:1.6rem}
@media (max-width:600px){
  header.mast{padding:3rem 0 2.25rem}
  header.mast h1{font-size:2rem}
  header.mast .lede{font-size:1.08rem}
  .doc-head h1{font-size:1.85rem}
  .doc-head .subtitle{font-size:1.08rem}
  .doc h2{font-size:1.4rem}
  body{font-size:16px}
}

/* download button */
.btn{
  display:inline-block;border:1px solid var(--accent);border-radius:3px;
  padding:.55rem 1.1rem;font-size:.9rem;font-weight:600;
  color:var(--accent);background:transparent;
}
.btn:hover{background:var(--accent-soft);border-bottom-color:var(--accent)}

/* contents */
.toc{background:var(--bg-panel);border-radius:5px;padding:1.4rem 1.6rem;margin:2.5rem 0 0}
.toc p.eyebrow{margin-bottom:.6rem}
.toc ol{list-style:none;margin:0;padding:0;columns:2;column-gap:2rem}
.toc li{margin:.3rem 0;font-size:.93rem;break-inside:avoid}
@media (max-width:600px){.toc ol{columns:1}}

/* plates */
figure{
  margin:2.4rem 0;padding:.75rem;background:var(--plate-bg);
  border:1px solid var(--plate-rule);border-radius:4px;
}
figure img{display:block;width:100%;border-radius:2px}
figure figcaption{
  font-size:.83rem;color:var(--ink-faint);text-align:center;
  margin-top:.7rem;padding:0 .5rem;
}
@media (prefers-color-scheme: dark){
  figure img{filter:brightness(.93) contrast(1.02)}
}
figure.portrait{max-width:24rem;margin-left:auto;margin-right:auto}

/* pull quote */
.kicker{
  border:1px solid var(--accent);border-left-width:3px;border-radius:3px;
  padding:1rem 1.3rem;margin:2.2rem 0;max-width:var(--measure);
}
.kicker p{
  margin:0;font-size:1.1rem;font-style:italic;
  font-family:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
}

/* boxed aside (worked example) */
.box{
  border:1px dashed var(--rule);border-radius:4px;
  padding:1.4rem 1.6rem;margin:2.2rem 0;max-width:var(--measure);
  background:var(--bg-panel);
}
.box > :first-child{margin-top:0}
.box > :last-child{margin-bottom:0}
.box h4{margin-top:1.4rem}
.box h4:first-of-type{margin-top:0}
.box .box-title{
  font-family:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  font-size:1.1rem;font-weight:600;margin:0 0 .8rem;
}

/* author block */
.author{
  display:grid;grid-template-columns:8rem 1fr;gap:0 1.6rem;
  align-items:start;max-width:var(--measure);
}
.author img{display:block;width:100%;border-radius:3px;border:1px solid var(--rule)}
.author .bio > :first-child{margin-top:0}
.author .bio > :last-child{margin-bottom:0}
@media (max-width:600px){
  .author{grid-template-columns:1fr;gap:1.1rem}
  .author .headshot{max-width:7.5rem}
}

/* ---------- contact ---------- */
.contact{background:var(--bg-panel);border-radius:6px;padding:2rem;margin-top:.5rem}
.contact p{margin:0 0 1rem;max-width:var(--measure)}
.contact p:last-child{margin-bottom:0}
.contact .addr{font-size:1.1rem;font-weight:600}

/* ---------- footer ---------- */
footer{padding:2.5rem 0 4rem;color:var(--ink-faint);font-size:.85rem;border-top:1px solid var(--rule)}
footer .wrap{display:flex;flex-wrap:wrap;gap:.5rem 1.5rem;justify-content:space-between}
footer a{color:var(--ink-faint)}
footer a:hover{color:var(--accent)}

/* ---------- QA environment banner ----------
   Remove this rule and the .qa-banner div when promoting to prod. */
.qa-banner{
  background:#8a4b00;color:#fff;text-align:center;
  font:600 .78rem/1 -apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  letter-spacing:.12em;text-transform:uppercase;
  padding:.55rem 1rem;
}

/* ---------- print ---------- */
@media print{
  .qa-banner,.sitenav,.topbar,.btn,.toc{display:none}
  body{background:#fff;color:#000;font-size:11pt}
  figure{break-inside:avoid}
  .doc h2{break-after:avoid}
}