/* ---------------------------------------------------------------------------
   Collective Cosmology — stylesheet
   Dark contemplative. Warm near-black page, off-white serif body, a single
   muted-gold accent used sparingly for rules, eyebrows, and small caps.
   No third-party fonts. Generous leading, narrow measure.
--------------------------------------------------------------------------- */

:root {
  --bg:         #0e0d10;
  --bg-soft:    #161418;
  --ink:        #e8e3d6;
  --ink-soft:   #c8c2b3;
  --ink-mute:   #9a9485;
  --rule:       #2b2925;
  --rule-soft:  #1f1d1b;
  --accent-blue:    #5279a0;    /* dusty cobalt — primary structural accent */
  --accent-gold:    #c8aa55;    /* muted gold — connective tissue, navigation */
  --accent-gold-soft:#9a8240;
  --accent-red:     #ad5050;    /* terracotta — concept identity, closing dictum */

  --serif: Charter, "Iowan Old Style", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
           Cantarell, "Helvetica Neue", Arial, sans-serif;
  --mono:  ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --maxw:      68ch;
  --maxw-wide: 1100px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 18px/1.75 var(--serif);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Base typography ----------------------------------------------------- */

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 500;
  color: var(--ink);
  margin: 1.8em 0 0.5em;
  line-height: 1.2;
  letter-spacing: -0.005em;
}
h1 { font-size: 2.0rem;  margin-top: 0; }
h2 { font-size: 1.4rem; }
h3 { font-size: 1.15rem; }
h4 {
  font-size: 0.78rem;
  font-family: var(--sans);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-blue);
}

p, ul, ol, blockquote, figure, table { margin: 0 0 1.1em; }

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
  text-decoration-thickness: 0.5px;
  transition: text-decoration-color 0.15s ease;
}
a:hover { text-decoration-color: var(--accent-blue); }

strong { font-weight: 600; color: var(--ink); }
em     { font-style: italic; color: var(--ink); }

hr { border: 0; border-top: 1px solid var(--rule); margin: 2em 0; }

small, .meta {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--ink-mute);
  letter-spacing: 0.01em;
}

code, kbd {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--bg-soft);
  padding: 0 0.25em;
  border-radius: 2px;
}

blockquote {
  border-left: 1px solid var(--accent-gold-soft);
  padding-left: 1.1em;
  color: var(--ink-soft);
}

/* --- Layout primitives --------------------------------------------------- */

.skip { position: absolute; left: -9999px; top: 0; }
.skip:focus {
  left: 1rem; top: 1rem;
  background: var(--ink); color: var(--bg);
  padding: 0.5em 0.75em; z-index: 100;
}

.wrap     { width: 100%; max-width: var(--maxw-wide); margin: 0 auto; padding: 0 1.5rem; }
main      { padding: 2.5rem 0 5rem; }
.prose    { max-width: var(--maxw); }
.prose p, .prose li { font-size: 1rem; }

.lede {
  font-size: 1.18rem;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 0.5em 0 1.75em;
  max-width: var(--maxw);
}

/* --- Site header --------------------------------------------------------- */

.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
}
.site-header__inner {
  display: flex; flex-wrap: wrap; align-items: baseline;
  gap: 1rem 2rem;
  padding-top: 1.4rem; padding-bottom: 1.2rem;
}

.site-mark {
  display: inline-flex; flex-direction: column; gap: 0.15rem;
  text-decoration: none; color: var(--ink);
}
.site-mark:hover { text-decoration: none; }
.site-mark__eyebrow {
  font-family: var(--sans); font-size: 0.7rem;
  text-transform: uppercase; letter-spacing: 0.18em;
  color: var(--accent-blue);
}
.site-mark__name {
  font-family: var(--serif); font-weight: 500; font-size: 1.4rem;
  letter-spacing: -0.005em;
}

.site-nav { margin-left: auto; }
.site-nav ul {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 0.2rem 1.5rem;
}
.site-nav li a {
  font-family: var(--sans); font-size: 0.88rem;
  color: var(--ink-soft); text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
  letter-spacing: 0.02em;
}
.site-nav li a:hover               { color: var(--ink); border-bottom-color: var(--rule); }
.site-nav li a[aria-current="page"]{ color: var(--ink); border-bottom-color: var(--accent-blue); }

/* --- Site footer --------------------------------------------------------- */

.site-footer {
  background: var(--bg);
  border-top: 1px solid var(--rule);
  margin-top: 4rem;
  padding: 2.5rem 0 3.5rem;
}
.site-footer__inner {
  display: grid; gap: 1.5rem; grid-template-columns: 1fr;
}
@media (min-width: 720px) {
  .site-footer__inner { grid-template-columns: 1.4fr 1fr; align-items: start; }
}
.site-footer__about p   { margin: 0 0 0.4rem; }
.site-footer__name      { font-weight: 500; }
.site-footer__tag       { color: var(--ink-mute); font-style: italic; }
.site-footer__nav ul    { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0.4rem 1.4rem; }
.site-footer__nav a     { font-family: var(--sans); font-size: 0.85rem; color: var(--ink-soft); text-decoration: none; }
.site-footer__nav a:hover { color: var(--ink); }
.site-footer__legal {
  font-family: var(--sans); font-size: 0.78rem; color: var(--ink-mute);
  grid-column: 1 / -1;
  margin-top: 1.25rem; padding-top: 1.25rem;
  border-top: 1px solid var(--rule-soft);
}
.site-footer__legal a {
  color: var(--ink-mute);
  text-decoration-color: var(--rule);
}
.site-footer__legal a:hover { color: var(--ink-soft); text-decoration-color: var(--accent-gold); }

/* --- Home: hero with starfield ------------------------------------------- */

.hero {
  position: relative;
  padding: 2rem 0 1.5rem;
  isolation: isolate;
}
.hero__stars {
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.55;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at top, #000 35%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at top, #000 35%, transparent 75%);
}
.hero__stars svg { width: 100%; height: 100%; display: block; }
.hero__eyebrow {
  font-family: var(--sans); font-size: 0.72rem;
  text-transform: uppercase; letter-spacing: 0.2em;
  color: var(--accent-blue); margin: 0 0 0.8rem;
}
.hero h1 {
  font-size: 2.2rem; line-height: 1.15; letter-spacing: -0.012em;
  margin: 0; max-width: 22ch; font-weight: 500;
}
.hero__byline {
  font-family: var(--sans); font-size: 0.82rem;
  color: var(--ink-mute);
  margin: 1.5rem 0 0;
  letter-spacing: 0.02em;
}
.hero__byline em { font-style: italic; color: var(--ink-soft); }

/* --- Section page ------------------------------------------------------- */

.section-eyebrow {
  font-family: var(--sans); font-size: 0.74rem;
  text-transform: uppercase; letter-spacing: 0.22em;
  color: var(--accent-blue);
  margin: 0 0 0.5rem;
  display: block;
}
.section-eyebrow::before {
  content: "";
  display: inline-block;
  width: 1.5rem; height: 1px;
  background: var(--accent-blue);
  vertical-align: middle;
  margin-right: 0.65rem;
  transform: translateY(-0.15em);
}
.section-title {
  font-size: 2rem; line-height: 1.15; letter-spacing: -0.008em;
  margin: 0 0 2rem;
  max-width: 28ch;
}

.section-prose {
  max-width: var(--maxw);
}
.section-prose p { font-size: 1rem; }
.section-prose p:first-of-type::first-letter {
  font-family: var(--serif);
  font-size: 3.6em;
  float: left;
  line-height: 0.95;
  padding: 0.05em 0.1em 0 0;
  color: var(--accent-blue);
  font-weight: 500;
}

/* Inline concept links — red underline so every pointer to a concept page
   is visibly a concept reference within the prose. */
.section-prose a {
  text-decoration-color: var(--accent-red);
}
.section-prose a:hover {
  text-decoration-color: var(--accent-red);
  text-decoration-thickness: 1px;
}

.section-nav {
  display: flex; flex-wrap: wrap; gap: 1.5rem 2rem;
  margin: 4rem 0 0;
  padding: 1.75rem 0 0;
  border-top: 1px solid var(--rule);
  font-family: var(--sans); font-size: 0.86rem;
  max-width: var(--maxw);
}
.section-nav__item { flex: 1 1 18ch; min-width: 0; }
.section-nav__item--next { text-align: right; margin-left: auto; }
.section-nav__label {
  display: block;
  text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--accent-gold);
  font-size: 0.72rem;
  margin-bottom: 0.25rem;
}
.section-nav__title {
  color: var(--ink); text-decoration: none;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1px;
}
.section-nav__title:hover { border-bottom-color: var(--accent-gold); }

/* --- Tables of contents -------------------------------------------------- */

.toc {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
  max-width: var(--maxw);
}
.toc li {
  padding: 0.7rem 0;
  border-top: 1px solid var(--rule-soft);
  display: grid;
  gap: 0.05rem 1rem;
}
.toc li:first-child { border-top: 0; }

.toc--sections li {
  grid-template-columns: 2.5rem 1fr;
  align-items: baseline;
}
.toc__roman {
  font-family: var(--sans); font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--accent-blue);
  text-transform: uppercase;
}
.toc__link {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}
.toc--sections .toc__link:hover { border-bottom-color: var(--accent-blue); }
.toc--concepts .toc__link:hover { border-bottom-color: var(--accent-red); }

.toc--concepts li {
  grid-template-columns: 1fr;
}
.toc--concepts .toc__link {
  font-family: var(--serif);
  font-weight: 500;
}
.toc__gloss {
  display: block;
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-mute);
  font-size: 0.95rem;
  line-height: 1.55;
  margin-top: 0.2rem;
  max-width: 64ch;
}

/* --- Concept page ------------------------------------------------------- */

.concept-eyebrow {
  font-family: var(--sans); font-size: 0.72rem;
  text-transform: uppercase; letter-spacing: 0.2em;
  color: var(--accent-red); margin: 0 0 0.5rem;
}
.concept-title {
  font-size: 2rem; line-height: 1.15;
  margin: 0 0 1.25rem;
}
.concept-lede {
  font-size: 1.18rem; line-height: 1.6;
  color: var(--ink-soft);
  border-top: 1px solid var(--accent-red);
  border-bottom: 1px solid var(--accent-red);
  padding: 1.25rem 0;
  margin: 0 0 1.75rem;
  font-style: italic;
  max-width: var(--maxw);
}
.concept-body { max-width: var(--maxw); }
.concept-body p { font-size: 1rem; }

.concept-backlink {
  font-family: var(--sans); font-size: 0.82rem;
  color: var(--ink-mute);
  margin: 2.5rem 0 0;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--rule);
}
.concept-backlink a {
  color: var(--ink-soft);
  text-decoration-color: var(--accent-gold);
}
.concept-backlink a:hover {
  text-decoration-color: var(--accent-gold);
  text-decoration-thickness: 1px;
}

/* --- Home: section-list + concept-list section heads ------------------- */

.home-section { margin: 4rem 0 2rem; }
.home-section h2 {
  font-family: var(--sans); font-weight: 600;
  font-size: 0.78rem; text-transform: uppercase;
  letter-spacing: 0.18em; color: var(--accent-blue);
  margin: 0 0 1.5rem; padding: 0 0 0.6rem;
  border-bottom: 1px solid var(--rule);
  max-width: var(--maxw);
}

.preface { max-width: var(--maxw); margin: 0 0 2.5rem; }
.preface p { font-size: 1rem; }

/* --- Publication datestamp colophon ------------------------------------- */

.datestamp {
  font-family: var(--sans);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin: 2.5rem 0 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--rule-soft);
  max-width: var(--maxw);
}
.datestamp time { color: var(--ink-soft); }

/* --- Closing dictum (final line of conclusion) -------------------------- */

.dictum {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.25rem;
  color: var(--accent-red);
  text-align: center;
  margin: 3rem auto 0;
  letter-spacing: 0.01em;
}

/* --- Responsive tweaks -------------------------------------------------- */

@media (max-width: 540px) {
  body { font-size: 17px; line-height: 1.7; }
  .hero h1 { font-size: 1.8rem; max-width: 100%; }
  .section-title, .concept-title { font-size: 1.65rem; }
  .section-prose p:first-of-type::first-letter { font-size: 3.2em; }
  .toc--sections li { grid-template-columns: 2rem 1fr; }
}

/* --- Print --------------------------------------------------------------- */

@media print {
  body { background: #fff; color: #000; }
  .site-nav, .site-footer__nav, .hero__stars { display: none; }
  a { color: #000; text-decoration: underline; }
  main { padding: 0; }
  .section-prose p:first-of-type::first-letter { color: #000; }
}