/*
 * ATLAS — first continuity environment prototype.
 *
 * A single hand-written stylesheet. No preprocessor, no framework, no
 * decorative motion. The intent is quiet, stable, readable presentation.
 */

/* ------------------------------------------------------------------ */
/* Tokens                                                              */
/* ------------------------------------------------------------------ */

:root {
  --bg:        #fafaf6;
  --fg:        #1f1d1a;
  --fg-muted:  #6a6864;
  --rule:      #d8d6cf;
  --link:      #6b3a1f;
  --link-hover:#8a4a28;
  --measure:   38em;

  --font-body: Charter, "Iowan Old Style", "Source Serif Pro",
               "Hoefler Text", Georgia, "Times New Roman", serif;

  --base:    1.125rem;   /* 18px */
  --leading: 1.65;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
}

/* ------------------------------------------------------------------ */
/* Reset & base                                                        */
/* ------------------------------------------------------------------ */

* { box-sizing: border-box; }

html {
  font-size: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--base);
  line-height: var(--leading);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-thickness: 0.5px;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--link-hover);
}

a:visited {
  color: var(--link);
}

p {
  margin: 0 0 var(--space-2) 0;
}

ul {
  margin: 0 0 var(--space-2) 0;
  padding-left: 1.25rem;
}

li {
  margin-bottom: 0.25rem;
}

h1, h2, h3 {
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 var(--space-2) 0;
}

h1 { font-size: 1.6rem; }
h2 { font-size: 1.2rem; margin-top: var(--space-3); }
h3 { font-size: 1.05rem; margin-top: var(--space-3); }

em { font-style: italic; }
strong { font-weight: 600; }

/* ------------------------------------------------------------------ */
/* Page frame                                                          */
/* ------------------------------------------------------------------ */

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  max-width: var(--measure);
  margin: var(--space-4) auto var(--space-3);
  padding: 0 var(--space-2);
  border-bottom: 1px solid var(--rule);
  padding-bottom: var(--space-2);
}

.site-name {
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--fg);
}

.site-nav a {
  margin-left: var(--space-2);
  font-size: 0.95rem;
  text-decoration: none;
  color: var(--fg-muted);
}

.site-nav a:hover {
  color: var(--fg);
}

.site-nav a.hub-link {
  font-style: italic;
  border-right: 1px solid var(--rule);
  padding-right: var(--space-2);
  margin-right: 0;
}

main {
  max-width: var(--measure);
  margin: 0 auto;
  padding: var(--space-3) var(--space-2) var(--space-5);
}

.site-footer {
  max-width: var(--measure);
  margin: var(--space-5) auto var(--space-4);
  padding: var(--space-2);
  border-top: 1px solid var(--rule);
  font-size: 0.875rem;
  color: var(--fg-muted);
}

.site-footer p {
  margin: 0;
}

/* ------------------------------------------------------------------ */
/* Homepage                                                            */
/* ------------------------------------------------------------------ */

.homepage h1 {
  font-size: 2rem;
  margin-bottom: var(--space-3);
}

.homepage .orientation {
  margin-bottom: var(--space-4);
}

.region-list h2 {
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  margin-bottom: var(--space-3);
}

.region-summary {
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
}

.region-summary h2 {
  font-size: 1.3rem;
  margin: 0 0 var(--space-1) 0;
  text-transform: none;
  letter-spacing: 0;
  color: var(--fg);
}

.region-summary h2 a {
  text-decoration: none;
  color: var(--fg);
}

.region-summary h2 a:hover {
  color: var(--link);
}

.region-summary p {
  margin: 0;
  color: var(--fg-muted);
}

/* ------------------------------------------------------------------ */
/* Region pages                                                        */
/* ------------------------------------------------------------------ */

.region h1 {
  font-size: 2rem;
  margin-bottom: var(--space-3);
}

.region-prose {
  margin-bottom: var(--space-4);
}

.entity-group {
  margin-bottom: var(--space-3);
}

.entity-group h2 {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  margin-bottom: var(--space-1);
}

.entity-group ul {
  list-style: none;
  padding-left: 0;
}

.entity-group li {
  margin-bottom: 0.35rem;
}

/* ------------------------------------------------------------------ */
/* Entity pages                                                        */
/* ------------------------------------------------------------------ */

.entity-header {
  margin-bottom: var(--space-3);
}

.entity-meta {
  margin: 0 0 var(--space-1) 0;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: var(--fg-muted);
  text-transform: lowercase;
}

.entity h1 {
  font-size: 1.9rem;
  margin: 0 0 var(--space-1) 0;
}

.entity .subtitle {
  margin: 0 0 var(--space-2) 0;
  color: var(--fg-muted);
  font-style: italic;
}

.entity .subtitle .gloss {
  font-style: normal;
}

.entity-body p {
  margin-bottom: var(--space-2);
}

.entity-body h2 {
  font-size: 1.05rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-muted);
  margin-top: var(--space-4);
  margin-bottom: var(--space-1);
}

/* ------------------------------------------------------------------ */
/* Blockquotes & attributions                                          */
/* ------------------------------------------------------------------ */

blockquote {
  margin: var(--space-2) 0 var(--space-1) 0;
  padding: 0.25rem 0 0.25rem var(--space-2);
  border-left: 2px solid var(--rule);
  font-style: normal;
  color: var(--fg);
}

blockquote em {
  font-style: italic;
}

/* Original-script blockquotes get language-specific treatment.
 * Each language class can override font-family, size, and rhythm
 * appropriate to the script. */

blockquote.lang-zh,
blockquote.lang-pi,
blockquote.lang-grc {
  font-style: normal;
  line-height: 1.7;
}

blockquote.lang-zh {
  /* Classical Chinese: the system fallback chain handles CJK gracefully
   * on most platforms. We avoid prescribing a specific font. */
  font-size: 1.1em;
  letter-spacing: 0.04em;
}

blockquote.lang-grc {
  /* Polytonic Greek renders well in our base serif on most systems. */
  font-size: 1em;
}

blockquote.lang-pi {
  /* Pāli in Latin transliteration with diacritics. */
  font-size: 1em;
}

p.attribution {
  margin: 0 0 var(--space-3) var(--space-2);
  font-size: 0.9em;
  color: var(--fg-muted);
}

p.attribution em {
  font-style: italic;
}

/* ------------------------------------------------------------------ */
/* Adjacency                                                           */
/* ------------------------------------------------------------------ */

.adjacency {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--rule);
}

.adjacency h2 {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  margin-bottom: var(--space-2);
  margin-top: 0;
}

.adjacency ul {
  list-style: none;
  padding-left: 0;
}

.adjacency li {
  margin-bottom: 0.5rem;
}

.adjacency .framing {
  color: var(--fg-muted);
  font-size: 0.95em;
}

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

@media (max-width: 40em) {
  :root { --base: 1.0625rem; }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav {
    margin-top: var(--space-1);
  }

  .site-nav a:first-child {
    margin-left: 0;
  }

  main {
    padding: var(--space-2);
  }

  .homepage h1,
  .region h1,
  .entity h1 {
    font-size: 1.6rem;
  }
}