/* SIBytes — document-blue editorial design (sister of AGIBytes, deliberately not its look).
   Literata (display + article serif) · Public Sans (UI) · JetBrains Mono (data/meta).
   One accent: record blue. Brand mark: "SI" + a solid square. Light + dark via [data-theme]. */

:root,
:root[data-theme="light"] {
  --paper: #F3F6FA;
  --surface: #FFFFFF;
  --ink: #14212E;
  --ink-soft: #4A5868;
  --ink-faint: #7B8794;
  --rule: #D6DEE7;
  --rule-strong: #B9C4D0;
  --accent: #1F5FBF;
  --accent-hover: #174A96;
  --accent-wash: #E6EEFA;
  --code-bg: #E9EEF4;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --paper: #0E161F;
  --surface: #152130;
  --ink: #E7EDF4;
  --ink-soft: #A4B1BF;
  --ink-faint: #76838F;
  --rule: #27343F;
  --rule-strong: #3A4854;
  --accent: #6FA6F2;
  --accent-hover: #8FBAF7;
  --accent-wash: #1A2A40;
  --code-bg: #1B2735;
  color-scheme: dark;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }
/* Keep the page in its horizontal viewport; wide tables scroll in their wrapper. */
html, body { overflow-x: clip; overscroll-behavior-x: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  font-family: 'Public Sans', -apple-system, 'Segoe UI', sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  background: var(--paper);
  color: var(--ink);
}

::selection { background: var(--accent); color: #fff; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

img { max-width: 100%; height: auto; }

.container { max-width: 68rem; margin: 0 auto; padding: 0 1.25rem; }

/* ---------- Header ---------- */

.site-header {
  border-bottom: 2px solid var(--ink);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  max-width: 68rem;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.logo {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
  display: inline-flex;
  align-items: baseline;
  line-height: 1;
}
.logo:hover { color: var(--ink); }
.logo-si { color: var(--accent); letter-spacing: 0.01em; }
.logo-bytes { color: var(--ink); }
/* The mark: a solid square after the name, sized to the x-height. Static, typographic. */
.logo-mark { display: inline-block; width: 0.42em; height: 0.42em; background: var(--accent); margin-left: 0.16em; transform: translateY(-0.02em); }

.site-nav {
  display: flex;
  gap: 1.1rem;
  margin-left: auto;
  align-items: center;
}
.site-nav a {
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a.active { color: var(--ink); border-bottom-color: var(--accent); }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 1px solid var(--rule-strong);
  color: var(--ink);
  font: inherit;
  font-size: 0.85rem;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  color: var(--ink-soft);
  width: 2rem;
  height: 2rem;
  cursor: pointer;
  font-size: 0.95rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--ink-soft); }
:root[data-theme="light"] .theme-icon-light { display: none; }
:root[data-theme="dark"] .theme-icon-dark { display: none; }

/* ---------- Shared bits ---------- */

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.9rem;
}

.btn {
  display: inline-block;
  font-family: 'Public Sans', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.55rem 1.15rem;
  border: 1px solid var(--ink);
  color: var(--ink);
  cursor: pointer;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
.btn-ghost { border-color: var(--rule-strong); color: var(--ink-soft); }

.side-text { color: var(--ink-faint); font-size: 0.85rem; }

.breadcrumbs {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--ink-faint);
  margin-bottom: 1rem;
}
.breadcrumbs a { color: var(--ink-faint); }
.breadcrumbs a:hover { color: var(--accent); }

/* ---------- Front page ---------- */

.front-page { padding: 2.25rem 0 1.5rem; }

.front-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr);
  gap: 2.5rem;
  align-items: start;
}

.front-lead .news-card.featured {
  border: none;
  background: none;
  padding: 0;
}
.front-lead .news-card.featured h2 {
  font-family: 'Literata', Georgia, serif;
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0.5rem 0 0.75rem;
}
.front-lead .news-card.featured .featured-subhead {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.12rem;
  color: var(--ink-soft);
  line-height: 1.5;
  margin-bottom: 0.6rem;
}
.front-lead .news-card.featured .featured-excerpt {
  font-family: 'Literata', Georgia, serif;
  font-size: 0.98rem;
  color: var(--ink-soft);
  line-height: 1.6;
  padding-top: 0.6rem;
  border-top: 1px solid var(--rule);
  margin-bottom: 0.75rem;
}

.front-secondary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--ink);
}
@media (max-width: 600px) {
  .front-secondary { grid-template-columns: 1fr; }
}

.front-empty {
  border: 1px dashed var(--rule-strong);
  padding: 2rem 1.5rem;
}
.front-empty h2 {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.front-empty p { color: var(--ink-soft); max-width: 34rem; }

.front-wire {
  border-left: 1px solid var(--rule);
  padding-left: 1.5rem;
}

.wire-list { display: flex; flex-direction: column; }

.wire-item {
  display: block;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
}
.wire-item:last-child { border-bottom: none; }
.wire-item:hover .wire-headline { color: var(--accent); }
.wire-time {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--ink-faint);
  display: block;
  margin-bottom: 0.15rem;
}
.wire-headline {
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.35;
}

.wire-more {
  display: inline-block;
  margin-top: 0.9rem;
  font-size: 0.85rem;
  font-weight: 600;
}

/* ---------- Field guide band ---------- */

.field-guide { padding: 1.5rem 0; border-top: 1px solid var(--rule); }

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
@media (max-width: 860px) {
  .guide-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 540px) {
  .guide-grid { grid-template-columns: 1fr; }
}

.guide-card {
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 1.1rem 1.2rem;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: border-color 120ms ease;
}
.guide-card:hover { border-color: var(--accent); color: var(--ink); }
.guide-name {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.2rem;
  font-weight: 600;
}
.guide-blurb { font-size: 0.87rem; color: var(--ink-soft); }
.guide-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--ink-faint);
  margin-top: auto;
  padding-top: 0.4rem;
}

/* ---------- Stories ---------- */

.stories { padding: 2rem 0; border-top: 1px solid var(--rule); }

.stories-head {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}
.stories-head h2 {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.6rem;
  font-weight: 600;
}

.stories-topics { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.topic-chip {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--ink-soft);
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  padding: 0.15rem 0.7rem;
}
.topic-chip:hover { border-color: var(--accent); color: var(--accent); }

.story-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
  gap: 1rem;
}

.news-card {
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 1.1rem 1.2rem;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  transition: border-color 120ms ease;
}
.news-card:hover { border-color: var(--accent); color: var(--ink); }
.news-card h2, .news-card h3 {
  font-family: 'Literata', Georgia, serif;
  font-weight: 600;
  font-size: 1.15rem;
  line-height: 1.25;
}
.news-card p { font-size: 0.88rem; color: var(--ink-soft); line-height: 1.45; }

.card-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.card-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--ink-faint);
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: 0.4rem;
}

.feed-list { display: flex; flex-direction: column; gap: 0.9rem; max-width: 46rem; }

/* ---------- Learn promo ---------- */

.learn-promo { border-top: 1px solid var(--rule); padding: 2rem 0 2.5rem; }
.learn-promo-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.learn-promo h2 {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.7rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}
.learn-promo p { color: var(--ink-soft); max-width: 36rem; }

/* ---------- Page (hero + body) ---------- */

.page-hero { padding: 2.5rem 0 0.5rem; }
.eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.6rem;
}
.page-hero h1 {
  font-family: 'Literata', Georgia, serif;
  font-size: clamp(1.9rem, 4.5vw, 2.8rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.015em;
  max-width: 44rem;
}
.page-lede {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.15rem;
  color: var(--ink-soft);
  margin-top: 0.7rem;
  max-width: 42rem;
  line-height: 1.5;
}

.page-body { padding: 1.5rem 0 3rem; }

.topic-header {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.45rem;
  font-weight: 600;
  padding: 1.5rem 0 0.75rem;
}

/* ---------- Prose ---------- */

.prose { max-width: 44rem; }
.prose p { margin-bottom: 1rem; }
.prose h2 {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
}
.prose h3 {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.15rem;
  font-weight: 600;
  margin: 1.4rem 0 0.5rem;
}
.prose ul, .prose ol { margin: 0 0 1rem 1.4rem; }
.prose li { margin-bottom: 0.35rem; }
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.9rem;
}
.prose th, .prose td {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
.prose th {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-bottom: 2px solid var(--ink);
}
.prose code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
.prose blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.25rem 0 0.25rem 1.1rem;
  margin: 1.25rem 0;
  color: var(--ink-soft);
  font-family: 'Literata', Georgia, serif;
  font-size: 1.08rem;
}

.legal-callout {
  background: var(--accent-wash);
  border-left: 3px solid var(--accent);
  padding: 0.9rem 1.1rem;
  margin: 1.25rem 0;
  font-size: 0.92rem;
}

/* ---------- Article ---------- */

.article-page { padding: 2.25rem 0 3rem; }
.article-container { max-width: 46rem; }

.article-topic {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.article-headline {
  font-family: 'Literata', Georgia, serif;
  font-size: clamp(1.8rem, 4.5vw, 2.7rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0.6rem 0 0.7rem;
}

.article-subhead {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.2rem;
  color: var(--ink-soft);
  line-height: 1.45;
  margin-bottom: 1.25rem;
}

.article-byline {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin-bottom: 1.75rem;
  font-size: 0.85rem;
}
.byline-avatar {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.8rem;
  flex: none;
}
.byline-name { font-weight: 600; margin-right: 0.4rem; }
.byline-role { color: var(--ink-faint); margin-right: 0.4rem; }
.byline-date, .byline-readtime {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--ink-faint);
}

.article-body {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.13rem;
  line-height: 1.68;
}
.article-body p { margin-bottom: 1.15rem; }
.article-body h2 {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2rem 0 0.8rem;
}

.article-sources, .article-share, .related-articles {
  margin-top: 2.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
}
.article-sources h3, .article-share h3, .related-articles h3 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 0.7rem;
}
.article-sources ul { margin-left: 1.2rem; font-size: 0.9rem; }
.article-sources li { margin-bottom: 0.3rem; }

.share-buttons { display: flex; gap: 0.6rem; }
.share-btn {
  border: 1px solid var(--rule-strong);
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-soft);
}
.share-btn:hover { border-color: var(--accent); color: var(--accent); }

.related-grid { grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr)); }

/* ---------- Directories ---------- */

/* Directory filters (models) — hidden until app.js enables them */
[hidden] { display: none !important; }
.dir-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 1rem 2rem;
  padding: 1rem 0 1.1rem;
  margin: 0.75rem 0 0.25rem;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.filter-group { border: 0; min-width: 0; }
.filter-label {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.45rem;
}
.filter-choices { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.filter-chip {
  position: relative;
  font-size: 0.78rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--ink-soft);
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  padding: 0.15rem 0.7rem;
  cursor: pointer;
  user-select: none;
}
.filter-chip input { position: absolute; opacity: 0; width: 0; height: 0; margin: 0; }
.filter-chip:hover { border-color: var(--accent); color: var(--accent); }
.filter-chip:has(input:checked) { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.filter-chip:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }
.filter-select {
  font: inherit;
  font-size: 0.85rem;
  line-height: 1.5;
  padding: 0.15rem 0.6rem;
  min-height: 1.9rem;
  max-width: 100%;
  border: 1px solid var(--rule-strong);
  border-radius: 0;
  background: var(--surface);
  color: var(--ink);
}
.filter-select:focus { outline: 2px solid var(--accent); outline-offset: 0; }
.filter-status {
  flex-basis: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: baseline;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--ink-faint);
}
.filter-reset {
  font: inherit;
  background: none;
  border: 0;
  padding: 0;
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
}
.filter-reset:hover { color: var(--accent-hover); }
.filter-empty { padding: 1.5rem 0 2rem; }

.dir-section { margin-bottom: 2.5rem; }
.dir-section > h2 {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.6rem;
  font-weight: 600;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--ink);
  margin-bottom: 1rem;
}

.entry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
  gap: 1rem;
}

.entry-card {
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 1.1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.entry-card h3 {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.2rem;
  font-weight: 600;
}
.entry-card p { font-size: 0.88rem; color: var(--ink-soft); line-height: 1.45; }
.entry-links {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: 0.5rem;
  font-size: 0.82rem;
  font-weight: 600;
}

.badge {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  padding: 0.05rem 0.4rem;
  color: var(--ink-soft);
  margin-right: 0.35rem;
}
.badge-open { border-color: var(--accent); color: var(--accent); }

.dir-table-wrap { overflow-x: auto; margin: 1rem 0 1.5rem; }
.dir-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  min-width: 44rem;
}
.dir-table th, .dir-table td {
  text-align: left;
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
.dir-table th {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-bottom: 2px solid var(--ink);
  white-space: nowrap;
}
.dir-table td:first-child { font-weight: 600; white-space: nowrap; }

/* ---------- Glossary ---------- */

.glossary-nav {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
  margin: 1rem 0 1.5rem;
}
.glossary-list { max-width: 46rem; }
.glossary-list dt {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 1.4rem;
}
.glossary-list dd { color: var(--ink-soft); margin-top: 0.25rem; line-height: 1.55; }
.glossary-letter {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--accent);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.25rem;
  margin-top: 2rem;
}

/* ---------- Timeline ---------- */

.timeline-list { max-width: 46rem; position: relative; padding-left: 1.5rem; }
.timeline-list::before {
  content: '';
  position: absolute;
  left: 0.3rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: var(--rule);
}
.timeline-item { position: relative; margin-bottom: 1.6rem; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.5rem;
  top: 0.45rem;
  width: 0.6rem;
  height: 0.6rem;
  margin-left: 0.02rem;
  background: var(--accent);
  border-radius: 50%;
}
.timeline-year {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.1em;
}
.timeline-item h3 {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0.15rem 0 0.25rem;
}
.timeline-item p { font-size: 0.92rem; color: var(--ink-soft); line-height: 1.5; }

/* ---------- Learn tracks ---------- */

.track-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0;
}
.track-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--accent);
  padding: 1.4rem 1.4rem 1.2rem;
  color: inherit;
  transition: border-color 0.15s ease;
}
.track-card:hover { border-color: var(--accent); }
.track-card:hover h2, .track-card:hover .track-count { color: var(--accent); }
.track-level {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}
.track-card h2 {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.45rem;
  font-weight: 600;
  margin: 0.4rem 0 0.5rem;
  transition: color 0.15s ease;
}
.track-card > p { font-size: 0.9rem; color: var(--ink-soft); margin-bottom: 0.9rem; }
.track-count {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}

/* ---------- Search ---------- */

.search-box {
  width: 100%;
  max-width: 44rem;
  font: inherit;
  font-size: 1.05rem;
  padding: 0.7rem 1rem;
  border: 1px solid var(--rule-strong);
  background: var(--surface);
  color: var(--ink);
  margin: 0.5rem 0 1.5rem;
}
.search-box:focus { outline: 2px solid var(--accent); outline-offset: 0; }
.search-results { display: flex; flex-direction: column; gap: 0.9rem; max-width: 46rem; }

/* ---------- 404 ---------- */

.notfound { text-align: left; padding: 4rem 0; max-width: 40rem; }
.notfound .code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--accent);
  letter-spacing: 0.16em;
}
.notfound h1 {
  font-family: 'Literata', Georgia, serif;
  font-size: 2.4rem;
  font-weight: 600;
  margin: 0.5rem 0 0.75rem;
}
.notfound p { color: var(--ink-soft); margin-bottom: 1.5rem; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 2px solid var(--ink);
  margin-top: 2rem;
  background: var(--paper);
}

.footer-inner {
  max-width: 68rem;
  margin: 0 auto;
  padding: 2.25rem 1.25rem 1.5rem;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 2rem;
}

.footer-brand p { font-size: 0.85rem; color: var(--ink-soft); margin-top: 0.6rem; max-width: 18rem; }
.footer-brand .logo { font-size: 1.3rem; }

.footer-col h4 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.7rem;
}
.footer-col a {
  display: block;
  font-size: 0.85rem;
  color: var(--ink-soft);
  padding: 0.15rem 0;
}
.footer-col a:hover { color: var(--accent); }

.footer-legal {
  max-width: 68rem;
  margin: 0 auto;
  padding: 0 1.25rem 1rem;
}
.footer-legal p { font-size: 0.75rem; color: var(--ink-faint); line-height: 1.55; }

.footer-bottom {
  border-top: 1px solid var(--rule);
}
.footer-bottom p {
  max-width: 68rem;
  margin: 0 auto;
  padding: 0.8rem 1.25rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--ink-faint);
}

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

@media (max-width: 980px), (pointer: coarse) {
  html { scroll-behavior: auto; }
  /* Prevent iOS focus zoom while preserving user-controlled pinch zoom. */
  input, select, textarea { font-size: max(1rem, 16px); }
}

@media (max-width: 860px) {
  .front-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .front-wire { border-left: none; padding-left: 0; border-top: 1px solid var(--rule); padding-top: 1.25rem; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--paper);
    border-bottom: 2px solid var(--ink);
    padding: 0.75rem 1.25rem 1rem;
    gap: 0.2rem;
    align-items: stretch;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 0.5rem 0; border-bottom: none; font-size: 1rem; }
  .header-inner { position: relative; }
}

/* ---------- Phone pass (2026-10-04): readable type, tappable targets, no cut-off tables ---------- */
@media (max-width: 640px) {
  /* Type floor: nothing below ~12.8px on a phone. Selectors generated from every sub-0.8rem rule above. */
  .article-sources h3, .article-share h3, .related-articles h3, .article-topic, .badge, .breadcrumbs, .byline-date, .byline-readtime, .card-meta, .card-tag, .dir-table th, .eyebrow, .filter-chip, .filter-label, .filter-status, .footer-bottom p, .footer-col h4, .footer-legal p, .glossary-letter, .guide-meta, .prose th, .section-label, .timeline-year, .topic-chip, .track-count, .track-level, .wire-time { font-size: 0.8rem; }
  .footer-legal p { font-size: 0.8rem; }

  /* Tables: stack each row into a labelled block instead of a sideways-scrolling 700px table. */
  .dir-table-wrap { overflow: visible; }
  .dir-table { min-width: 0; white-space: normal; table-layout: auto; }
  .dir-table td, .dir-table td * { white-space: normal; overflow-wrap: anywhere; min-width: 0; }
  .dir-table td > :is(span, time, a) { display: inline; }
  .dir-table, .dir-table tbody, .dir-table tr, .dir-table td { display: block; width: 100%; }
  .dir-table thead { display: none; }
  .dir-table tr { background: var(--surface); border: 1px solid var(--rule); padding: 0.6rem 0.85rem; margin: 0 0 0.6rem; }
  .dir-table td { display: grid; grid-template-columns: 6.5rem 1fr; gap: 0.5rem; padding: 0.3rem 0; border: 0; text-align: left; }
  .dir-table td::before { content: attr(data-label); font-family: 'JetBrains Mono', monospace; font-size: 0.68rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-faint); padding-top: 0.15em; }
  .dir-table td a { display: inline-block; padding: 0.35rem 0; }
  /* The model directory shows cards and the same data as a table; on phones the cards are enough. */
  .dir-table-wrap[data-filter-table] { display: none; }

  /* Tap targets: 44px minimum for letter nav, filter chips, entry links. */
  .glossary-nav { display: flex; flex-wrap: wrap; gap: 0.25rem; }
  .glossary-nav a { display: inline-flex; align-items: center; justify-content: center; min-width: 2.75rem; min-height: 2.75rem; border: 1px solid var(--rule); font-size: 0.9rem; }
  .entry-links a, .entry-card a, .match-links a { display: inline-block; padding: 0.55rem 0.2rem; min-height: 2.75rem; }
  .filter-chip, [data-filter] label, .matcher-presets button { min-height: 2.75rem; padding: 0.5rem 0.85rem; font-size: 0.9rem; }
  select, input, button { min-height: 2.75rem; }
  .site-nav a { padding: 0.75rem 0; font-size: 1.05rem; }
}

/* The matcher uses the publication's paper, ink, and wire-red palette. */
.matcher-intro { display: flex; align-items: center; gap: .6rem; color: var(--ink-soft); font-size: .9rem; margin: .5rem 0 1.7rem; }
.matcher-dot { width: .45rem; height: .45rem; background: var(--accent); border-radius: 50%; flex-shrink: 0; }
.matcher-layout { display: grid; grid-template-columns: 18rem minmax(0, 1fr); gap: 2.5rem; align-items: start; }
.matcher-controls { min-width: 0; border: 1px solid var(--rule-strong); background: var(--surface); padding: 1.4rem; }
@media (min-width: 981px) and (hover: hover) and (pointer: fine) {
  .matcher-controls { position: sticky; top: 5.5rem; max-height: calc(100dvh - 7rem); overflow-y: auto; }
}
.matcher-label { display: block; font-size: .84rem; font-weight: 500; margin: 1rem 0 .35rem; }
.matcher-controls select, .matcher-results-toolbar select { color: var(--ink); background: var(--paper); border: 1px solid var(--rule-strong); padding: .65rem .5rem; font: inherit; font-size: .83rem; max-width: 100%; width: 100%; border-radius: 0; }
.matcher-controls :is(input, select, button):focus-visible, .matcher-results :is(button, select):focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.matcher-memory-input { display: flex; align-items: baseline; border-bottom: 2px solid var(--ink); gap: .5rem; margin-bottom: .85rem; }
.matcher-memory-input input { min-width: 0; width: 100%; font: 500 3.8rem/1.2 'Literata', Georgia, serif; color: var(--ink); background: transparent; border: 0; padding: .25rem 0; }
.matcher-memory-input > span { color: var(--ink-soft); font-family: 'JetBrains Mono', monospace; }
.matcher-presets { display: flex; flex-wrap: wrap; gap: .4rem; }
.matcher-presets button { font: inherit; font-size: .78rem; padding: .4rem .62rem; color: var(--ink-soft); background: var(--paper); border: 1px solid var(--rule); cursor: pointer; }
.matcher-presets button:hover { border-color: var(--accent); }
.matcher-presets button[aria-pressed="true"] { color: var(--paper); background: var(--ink); border-color: var(--ink); }
.matcher-help { color: var(--ink-soft); font-size: .76rem; line-height: 1.55; margin-top: .65rem; }
.matcher-budget { background: var(--paper); border-left: 2px solid var(--accent); margin-top: 1.1rem; padding: .75rem; font-size: .78rem; }
.matcher-budget strong { font-weight: 600; }
.matcher-budget > span { display: block; margin-top: .15rem; color: var(--ink-soft); font-size: .71rem; }
.matcher-gpu-heading { display: flex; align-items: baseline; justify-content: space-between; gap: .5rem; }
.matcher-gpu-row { border-top: 1px solid var(--rule); margin-top: .8rem; min-width: 0; }
.matcher-remove-gpu, .matcher-add-gpu { font: inherit; font-size: .8rem; color: var(--accent); cursor: pointer; }
.matcher-remove-gpu { background: transparent; border: 0; padding: .6rem 0; }
.matcher-add-gpu { width: 100%; min-height: 44px; margin-top: .8rem; padding: .6rem; border: 1px solid var(--rule-strong); background: var(--paper); }
.matcher-add-gpu:disabled { color: var(--ink-soft); cursor: default; opacity: .65; }
.matcher-add-gpu[hidden] { display: none; }
.matcher-unit-memory[hidden], .matcher-unit-memory-label[hidden] { display: none; }
.matcher-gpu-budget { margin-top: .5rem; padding-left: 1rem; font-size: .72rem; }
.match-gpu-split { font-size: .76rem; margin: .8rem 0; }
.match-gpu-split summary { cursor: pointer; }
.match-gpu-split ul { list-style: none; margin-top: .6rem; }
.match-gpu-split li { margin-bottom: .5rem; }
.match-gpu-split strong, .match-gpu-split span { display: block; overflow-wrap: anywhere; }
.match-gpu-split span, .match-gpu-split p { color: var(--ink-soft); }
.match-popularity { font-size: .75rem; color: var(--ink-soft); margin-top: .6rem; }
.match-speed { margin: .8rem 0; padding: .7rem; border-left: 2px solid var(--accent); background: var(--accent-wash); }
.match-speed strong { font-size: 1.05rem; }
.match-speed span { display: block; font-size: .72rem; color: var(--ink-soft); }
.matcher-freshness { margin: -.4rem 0 1.2rem; }
.matcher-divider { padding-top: 1.4rem; margin-top: 1.4rem; border-top: 1px solid var(--rule); }
.matcher-reset, .matcher-share { font: inherit; font-size: .8rem; border: 0; background: transparent; color: var(--ink-soft); cursor: pointer; padding: .3rem 0; }
.matcher-reset { margin-top: 1.1rem; text-decoration: underline; text-underline-offset: 3px; }
.matcher-share { color: var(--accent); white-space: nowrap; }
.matcher-results { min-width: 0; }
#matcher-query { width: 100%; padding: .7rem; border: 1px solid var(--rule-strong); background: var(--surface); color: var(--ink); font: inherit; font-size: .86rem; margin-bottom: .8rem; }
#matcher-query:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
#matcher-context-status { margin: -.4rem 0 1rem; }
.match-date { font: .65rem 'JetBrains Mono', monospace; color: var(--ink-soft); margin-top: .5rem; }
.match-context-note { font-size: .75rem; padding: .6rem .75rem; margin: .7rem 0; background: var(--accent-wash); color: var(--ink-soft); border-left: 2px solid var(--accent); }
.match-context-note p { margin-top: .3rem; }
.match-cache-note { font-size: .7rem; color: var(--ink-soft); margin: .6rem 0; }
.match-unsized { border-top: 1px solid var(--rule); padding: 1rem 0; font-size: .8rem; }
.match-unsized h3 { font: 500 1.3rem 'Literata', Georgia, serif; overflow-wrap: anywhere; }
.match-unsized p { color: var(--ink-soft); margin: .5rem 0; }
.match-card h3 { overflow-wrap: anywhere; min-width: 0; }
.matcher-controls[hidden] + .matcher-results { grid-column: 1 / -1; }
.matcher-results-head { display: flex; justify-content: space-between; align-items: start; gap: 1rem; }
.matcher-results-head h2 { font: 500 1.8rem/1.15 'Literata', Georgia, serif; margin-top: .5rem; }
#matcher-status { color: var(--ink-soft); font-size: .86rem; margin: .6rem 0 1rem; }
.matcher-results-toolbar { border-block: 1px solid var(--rule); padding: .65rem 0; display: flex; justify-content: space-between; gap: .6rem; align-items: center; color: var(--ink-soft); font-size: .72rem; margin-bottom: 1.2rem; }
.matcher-results-toolbar label { display: flex; align-items: center; gap: .5rem; flex-shrink: 0; }
.matcher-results-toolbar select { width: auto; padding: .35rem; font-size: .73rem; }
.match-card { border: 1px solid var(--rule-strong); border-top: 2px solid var(--ink); background: var(--surface); padding: 1.3rem 1.4rem; margin-bottom: 1rem; }
.match-card-top, .match-card-heading, .match-card-bottom { display: flex; justify-content: space-between; gap: .7rem; align-items: baseline; }
.match-card-top { margin-bottom: .75rem; font: .67rem 'JetBrains Mono', monospace; }
.match-fit { color: var(--accent); }
.match-fit-comfortable { color: var(--ink-soft); }
.match-fit-comfortable > span { color: #397550; }
:root[data-theme="dark"] .match-fit-comfortable > span { color: #83bf97; }
.match-quant { color: var(--ink-soft); }
.match-card h3 { font: 500 1.7rem/1.2 'Literata', Georgia, serif; letter-spacing: -.01em; }
.match-required { flex-shrink: 0; text-align: right; }
.match-required strong { display: block; font: 500 1.65rem/1.1 'Literata', Georgia, serif; }
.match-required strong > span { font-size: .85rem; }
.match-required > span { color: var(--ink-soft); font-size: .65rem; }
.match-tags { display: flex; gap: .4rem .8rem; flex-wrap: wrap; color: var(--ink-soft); font-size: .68rem; margin: .6rem 0; }
.match-tags > span + span::before { content: '·'; margin-right: .7rem; }
.match-note { font-size: .84rem; line-height: 1.55; color: var(--ink-soft); margin: .7rem 0 1rem; }
.match-memory-bar { height: .4rem; display: flex; overflow: hidden; background: var(--paper); }
.match-memory-weights { background: var(--ink); }
.match-memory-cache { background: var(--accent); }
.match-memory-runtime { background: var(--rule-strong); }
.match-memory-key { display: flex; flex-wrap: wrap; gap: .35rem 1rem; margin-top: .5rem; font-size: .65rem; color: var(--ink-soft); }
.match-memory-key i { display: inline-block; width: .4rem; height: .4rem; margin-right: .3rem; }
.match-card-bottom { color: var(--ink-soft); margin: .7rem 0 1rem; font-size: .68rem; }
.match-headroom { color: var(--ink); }
.match-links { border-top: 1px solid var(--rule); padding-top: .9rem; display: flex; gap: .7rem 1rem; flex-wrap: wrap; align-items: center; font-size: .76rem; }
.match-download { font-weight: 600; }
.match-publisher { margin-left: auto; color: var(--ink-soft); font-size: .66rem; }
.match-shards { font-size: .76rem; margin-top: .6rem; }
.match-shards ul { display: flex; flex-wrap: wrap; list-style: none; gap: .7rem; margin-top: .5rem; }
.matcher-outside { margin-top: 1.6rem; }
.matcher-outside > summary { font-size: .85rem; cursor: pointer; padding-bottom: .8rem; }
.matcher-more > summary { color: var(--accent); font-size: .85rem; cursor: pointer; padding: .5rem 0 1rem; }
.match-card-outside { border-top-color: var(--rule-strong); }
.matcher-empty, .matcher-notice { padding: 1.5rem; background: var(--accent-wash); border: 1px solid var(--rule); }
.matcher-empty h3 { font: 500 1.7rem 'Literata', Georgia, serif; margin: .5rem 0; }
.matcher-empty p { font-size: .9rem; color: var(--ink-soft); }
.matcher-empty button { font: inherit; font-size: .85rem; padding: .6rem .8rem; background: var(--ink); color: var(--paper); border: 0; cursor: pointer; margin-top: 1rem; }
.matcher-method { border-top: 2px solid var(--ink); padding-top: 2rem; margin-top: 3rem; display: grid; grid-template-columns: 18rem minmax(0, 1fr); gap: 2.5rem; }
.matcher-method h2 { font: 500 1.8rem/1.2 'Literata', Georgia, serif; margin: .6rem 0; }
.matcher-method p { font-size: .86rem; color: var(--ink-soft); margin: .6rem 0 1rem; }
.matcher-method a { font-size: .8rem; }
.matcher-method details { border-bottom: 1px solid var(--rule); padding: .9rem 0; }
.matcher-method details:first-child { padding-top: 0; }
.matcher-method summary { font-weight: 500; cursor: pointer; font-size: .9rem; }
.matcher-promo { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; background: var(--accent-wash); border-left: 3px solid var(--accent); padding: 1rem 1.2rem; margin: 1.3rem 0; }
.matcher-promo strong { display: block; font: 500 1.4rem 'Literata', Georgia, serif; }
.matcher-promo p { font-size: .86rem; color: var(--ink-soft); }
.matcher-promo > a { font-size: .86rem; font-weight: 500; }
.guide-grid > .matcher-promo { grid-column: 1 / -1; margin: 0; }
@media (max-width: 980px), (pointer: coarse) {
  .matcher-layout, .matcher-method { grid-template-columns: minmax(0, 1fr); gap: 1.4rem; }
  .matcher-results-head, .matcher-results-toolbar { flex-wrap: wrap; }
  .matcher-controls select, .matcher-results-toolbar select, #matcher-query { font-size: max(1rem, 16px); }
  .matcher-results-toolbar label { min-width: 0; max-width: 100%; }
  .matcher-results-toolbar select { min-width: 0; }
}
@media (max-width: 740px) { .matcher-controls .section-label { margin-bottom: .5rem; } .matcher-memory-input input { font-size: 3rem; } .match-card { padding: 1.1rem; } .match-card h3 { font-size: 1.5rem; } .matcher-method { margin-top: 2rem; } }
@media (max-width: 380px) { .match-card-heading { flex-wrap: wrap; } .match-required { text-align: left; } .match-card-top { flex-wrap: wrap; } .match-publisher { margin-left: 0; } }
.match-lab { color: var(--accent); font-size: 11px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; margin-top: 16px; }
.match-selected { color: var(--ink-soft); font-size: 13px; margin: -6px 0 12px; overflow-wrap: anywhere; }
.match-alternatives { margin-top: 16px; border-top: 1px solid var(--rule); padding-top: 12px; font-size: 12px; }
.match-alternatives summary { cursor: pointer; font-weight: 600; }
.match-alternatives ul { list-style: none; padding: 0; margin: 8px 0 0; }
.match-alternatives li { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; padding: 12px 0; border-top: 1px solid var(--rule); }
.match-alternatives li > div { flex: 1 1 200px; min-width: 0; }
.match-alternatives strong, .match-alternatives span { display: block; overflow-wrap: anywhere; }
.match-alternatives span { color: var(--ink-soft); margin-top: 4px; }

.matcher-memory-input[hidden], .matcher-presets[hidden], #matcher-installed-memory[hidden] { display: none; }

@media (max-width: 640px) {
  .match-cache-note, .match-card-bottom, .match-card-top, .match-context-note, .match-date, .match-gpu-split, .match-links, .match-memory-key, .match-popularity, .match-publisher, .match-required > span, .match-shards, .match-speed span, .match-tags, .matcher-budget, .matcher-budget > span, .matcher-gpu-budget, .matcher-help, .matcher-presets button, .matcher-results-toolbar, .matcher-results-toolbar select { font-size: 0.8rem; }
  .match-card-top, .match-date { font-size: 0.78rem; }
}
@media (max-width: 640px) {
  .match-lab, .match-lab * { font-size: 0.8rem; }
  /* Every link inside a result card gets a thumb-sized hit area. */
  .match-card a, .matcher-results a, .match-unsized { display: inline-block; padding: 0.55rem 0.2rem; min-height: 2.75rem; line-height: 1.4; }
  .match-links { gap: 0.25rem 0.9rem; }
}