/* ============================================================
   PARALLAX PRESS, Common Knowledge Project
   Shared identity stylesheet (Wikipedia Vector 2022 skin)
   Type: system sans body, serif (Georgia) headings, no webfonts
   ============================================================ */

:root {
  --paper:         #f8f9fa;   /* page frame */
  --surface:       #ffffff;   /* content background */
  --ink:           #202122;
  --ink-2:         #54595d;
  --ink-3:         #72777d;
  --border-strong: #a2a9b1;
  --border:        #c8ccd1;
  --border-soft:   #eaecf0;
  --panel:         #f8f9fa;   /* infobox / TOC / table cell */
  --panel-head:    #eaecf0;   /* table + box headers */
  --link:          #3366cc;
  --link-visited:  #795cb2;
  --link-red:      #ba0000;   /* unresolved wikilink */
  --link-red-visited: #a55858;
  --gutter: clamp(16px, 4vw, 40px);
  --measure: 46em;            /* reading column ceiling */
  --sidebar-w: 11em;
  --serif: "Linux Libertine", "Georgia", "Times New Roman", serif;
  --sans: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
:root[data-theme="dark"] {
  --paper:         #101418;
  --surface:       #1c1f24;
  --ink:           #eaecf0;
  --ink-2:         #c8ccd1;
  --ink-3:         #a2a9b1;
  --border-strong: #54595d;
  --border:        #43464a;
  --border-soft:   #2e3136;
  --panel:         #27292d;
  --panel-head:    #2e3136;
  --link:          #6699ff;
  --link-visited:  #a698dd;
  --link-red:      #e0787a;
  --link-red-visited: #c98080;
}

/* ---------- Reset / base ---------- */
*,*::before,*::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--sans); font-size: 16px; line-height: 1.6;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
img { max-width: 100%; }
a { color: var(--link); text-decoration: none; }
a:visited { color: var(--link-visited); }
a:hover { text-decoration: underline; }
a.clink[href="#"] { color: var(--link-red); }         /* unresolved wikilink -> red link */
a.clink[href="#"]:visited { color: var(--link-red-visited); }
::selection { background: #b5d5ff; color: var(--ink); }
h1, h2 { font-family: var(--serif); font-weight: 400; line-height: 1.25;
  border-bottom: 1px solid var(--border-strong); padding-bottom: .2em; margin: 1.2em 0 .5em; }
h1 { font-size: 1.9rem; }
h2 { font-size: 1.5rem; }
h3, h4, h5, h6 { font-family: var(--sans); font-weight: 700; line-height: 1.3; margin: 1.2em 0 .4em; }
h3 { font-size: 1.15rem; } h4 { font-size: 1rem; }
p { margin: 0 0 .8em; }

/* ============================================================
   VECTOR CHROME: top bar, left sidebar, footer
   ============================================================ */
.skip-link { position: absolute; left: -999px; }
.skip-link:focus { left: 8px; top: 8px; background: var(--surface); padding: 6px 10px; border: 1px solid var(--border-strong); z-index: 20; }

.site-header { position: sticky; top: 0; z-index: 10; background: var(--surface);
  border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; gap: 14px; max-width: 1400px;
  margin: 0 auto; padding: 6px var(--gutter); }
.nav-toggle { display: none; }
.brand { display: flex; align-items: center; gap: 9px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand .seal { flex: none; color: var(--ink); }
.brand-words { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-family: var(--serif); font-size: 1.15rem; }
.brand-sub { font-size: .72rem; color: var(--ink-3); }
.header-search { margin-left: auto; flex: 0 1 320px; }
.header-search input { width: 100%; font: inherit; font-size: .9rem; padding: 5px 10px;
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--border-strong); border-radius: 2px; }
.icon-btn { display: grid; place-items: center; width: 34px; height: 34px; cursor: pointer;
  background: none; border: 1px solid transparent; border-radius: 2px; color: var(--ink-2); }
.icon-btn:hover { background: var(--border-soft); }

.site-body { display: grid; grid-template-columns: var(--sidebar-w) minmax(0,1fr);
  max-width: 1400px; margin: 0 auto; }
.site-nav { padding: 18px var(--gutter) 40px; padding-left: var(--gutter);
  border-right: 1px solid var(--border-soft); font-size: .875rem;
  position: sticky; top: 44px; align-self: start; height: calc(100vh - 44px); overflow-y: auto; }
.nav-group { margin-bottom: 18px; }
.nav-head { font-size: .72rem; text-transform: uppercase; letter-spacing: .05em;
  color: var(--ink-3); margin: 0 0 4px; }
.site-nav ul { list-style: none; margin: 0; padding: 0; }
.site-nav li { margin: 0; }
.site-nav a { display: block; padding: 3px 6px; color: var(--link); border-radius: 2px; }
.site-nav a:hover { background: var(--border-soft); text-decoration: none; }
.site-nav a.current { color: var(--ink); font-weight: 700; }
.nav-license { font-size: .72rem; color: var(--ink-3); line-height: 1.4; margin-top: 24px; }
.nav-close { display: none; }

.site-content { background: var(--surface); min-width: 0;
  border-left: 1px solid var(--border-soft); }

.site-footer { border-top: 1px solid var(--border); background: var(--paper); margin-top: 48px; }
.footer-inner { max-width: 1400px; margin: 0 auto; padding: 24px var(--gutter);
  font-size: .82rem; color: var(--ink-2); }
.footer-name { font-family: var(--serif); font-size: 1rem; color: var(--ink); margin: 0 0 4px; }
.footer-license { color: var(--ink-3); margin: 8px 0; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 6px 18px; }

@media (max-width: 800px) {
  .nav-toggle { display: grid; place-items: center; width: 34px; height: 34px;
    background: none; border: 1px solid var(--border); border-radius: 2px; color: var(--ink-2); cursor: pointer; }
  .site-body { grid-template-columns: 1fr; }
  .site-nav { position: fixed; top: 44px; left: 0; width: min(80vw, 300px); height: calc(100vh - 44px);
    background: var(--surface); border-right: 1px solid var(--border); padding-left: var(--gutter);
    transform: translateX(-100%); transition: transform .18s ease; z-index: 12; }
  .nav-close { display: grid; place-items: center; width: 34px; height: 34px; margin: -8px 0 10px auto;
    background: none; border: 1px solid var(--border); border-radius: 2px; color: var(--ink-2); cursor: pointer; }
  .site-body[data-nav="open"] .site-nav { transform: translateX(0); }
  .site-content { border-left: 0; }
  .header-search { flex-basis: 160px; }
}

/* ============================================================
   READING MEASURE (content column wrapper)
   ============================================================ */
.wrap { max-width: var(--measure); margin: 0 auto; padding: 22px var(--gutter) 0; }


/* print: hide app chrome, show only the article */
@media print {
  body { background: #fff; color: #000; }
  .site-header, .site-nav, .site-footer, .toc, .infobox { display: none; }
  .site-body { display: block; }
}