:root {
  color-scheme: light;
  --bg: #f7f4ed;
  --surface: #fbf8f0;
  --surface-strong: #f4efe5;
  --surface-rgb: 251, 248, 240;
  --ink: #191816;
  --muted: #69645d;
  --soft: #ded6ca;
  --line: #c9bfb1;
  --accent: #176b61;
  --accent-strong: #0f4e48;
  --rust: #a34725;
  --gold: #b58523;
  --code-bg: #eee7dc;
  --grid-line: rgba(23, 107, 97, 0.04);
  --grid-line-strong: rgba(23, 107, 97, 0.035);
  --link-underline: rgba(23, 107, 97, 0.35);
  --nav-bg: rgba(var(--surface-rgb), 0.88);
  --panel-bg: rgba(var(--surface-rgb), 0.76);
  --card-bg: rgba(var(--surface-rgb), 0.84);
  --logo-filter: brightness(0);
  --accent-bg: #e8f1ec;
  --accent-bg-hover: #eef6f1;
  --strong-ink: #11100f;
  --quote-bg: rgba(232, 241, 236, 0.72);
  --quote-ink: #32302c;
  --code-ink: #47301f;
  --pre-bg: #24211d;
  --pre-ink: #f8e9c7;
  --citation-bg: #f1e6cf;
  --citation-ink: #6b4510;
  --table-header-bg: #eee7dc;
  --inset-highlight: rgba(244, 239, 229, 0.72);
  --shadow: 0 18px 45px rgba(42, 34, 24, 0.09);
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #000000;
    --surface: #1f1d1a;
    --surface-strong: #29251f;
    --surface-rgb: 31, 29, 26;
    --ink: #f2ede4;
    --muted: #bdb4a7;
    --soft: #3b352e;
    --line: #5b5146;
    --accent: #63c9bb;
    --accent-strong: #9ee8de;
    --rust: #f09a72;
    --gold: #e2bc68;
    --code-bg: #332d25;
    --grid-line: transparent;
    --grid-line-strong: transparent;
    --link-underline: rgba(158, 232, 222, 0.45);
    --nav-bg: #000000;
    --panel-bg: rgba(var(--surface-rgb), 0.78);
    --card-bg: rgba(var(--surface-rgb), 0.84);
    --logo-filter: none;
    --accent-bg: #223b36;
    --accent-bg-hover: #284943;
    --strong-ink: #f8efe0;
    --quote-bg: rgba(34, 59, 54, 0.72);
    --quote-ink: #e5ded2;
    --code-ink: #f0c892;
    --pre-bg: #100f0d;
    --pre-ink: #f8e9c7;
    --citation-bg: #3d311e;
    --citation-ink: #ffd48b;
    --table-header-bg: #2f2a23;
    --inset-highlight: rgba(248, 233, 199, 0.06);
    --shadow: 0 18px 45px rgba(0, 0, 0, 0.34);
  }
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #000000;
  --surface: #1f1d1a;
  --surface-strong: #29251f;
  --surface-rgb: 31, 29, 26;
  --ink: #f2ede4;
  --muted: #bdb4a7;
  --soft: #3b352e;
  --line: #5b5146;
  --accent: #63c9bb;
  --accent-strong: #9ee8de;
  --rust: #f09a72;
  --gold: #e2bc68;
  --code-bg: #332d25;
  --grid-line: transparent;
  --grid-line-strong: transparent;
  --link-underline: rgba(158, 232, 222, 0.45);
  --nav-bg: #000000;
  --panel-bg: rgba(var(--surface-rgb), 0.78);
  --card-bg: rgba(var(--surface-rgb), 0.84);
  --logo-filter: none;
  --accent-bg: #223b36;
  --accent-bg-hover: #284943;
  --strong-ink: #f8efe0;
  --quote-bg: rgba(34, 59, 54, 0.72);
  --quote-ink: #e5ded2;
  --code-ink: #f0c892;
  --pre-bg: #100f0d;
  --pre-ink: #f8e9c7;
  --citation-bg: #3d311e;
  --citation-ink: #ffd48b;
  --table-header-bg: #2f2a23;
  --inset-highlight: rgba(248, 233, 199, 0.06);
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(90deg, var(--grid-line) 0 1px, transparent 1px 100%),
    linear-gradient(180deg, var(--grid-line-strong) 0 1px, transparent 1px 100%),
    var(--bg);
  background-size: 32px 32px;
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.65;
}

a {
  color: var(--accent-strong);
  text-decoration-color: var(--link-underline);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--rust);
  text-decoration-color: currentColor;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 20;
  transform: translateY(-150%);
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-strong);
  padding: 0.55rem 0.8rem;
  color: var(--ink);
  box-shadow: var(--shadow);
}

.skip-link:focus {
  transform: translateY(0);
}

.layout {
  display: grid;
  grid-template-columns: minmax(250px, 320px) minmax(0, 1fr);
  min-height: 100vh;
}

.site-nav {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  border-right: 1px solid var(--line);
  background: var(--nav-bg);
  padding: 1.15rem;
  backdrop-filter: blur(16px);
}

.brand {
  display: grid;
  grid-template-columns: 3.25rem 1fr;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1.25rem;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 3.25rem;
  height: 2.55rem;
  place-items: center;
}

.brand-mark img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: var(--logo-filter);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 0.98rem;
  line-height: 1.2;
}

.brand small {
  color: var(--muted);
  font-size: 0.73rem;
}

.site-nav ol {
  display: grid;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a:not(.brand) {
  display: grid;
  gap: 0.1rem;
  border-radius: 7px;
  padding: 0.58rem 0.66rem;
  color: var(--ink);
  text-decoration: none;
}

.site-nav a:not(.brand):hover,
.site-nav a:not(.brand):focus-visible,
.site-nav a[aria-current="page"] {
  background: var(--accent-bg);
  color: var(--accent-strong);
}

.site-nav a:not(.brand):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.site-nav span {
  font-size: 0.88rem;
  font-weight: 700;
  line-height: 1.25;
  overflow-wrap: anywhere;
}

.site-nav small {
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  overflow-wrap: anywhere;
}

.theme-toggle,
.thread-actions button,
.import-control,
.thread-filter label {
  display: inline-flex;
  min-height: 2.35rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface-strong);
  padding: 0.45rem 0.72rem;
  color: var(--ink);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 800;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
}

.theme-toggle {
  width: 100%;
  margin: 0 0 0.8rem;
}

.theme-toggle:hover,
.thread-actions button:hover,
.import-control:hover {
  border-color: var(--accent);
  background: var(--accent-bg);
  color: var(--accent-strong);
}

.document,
.index-page {
  width: min(100%, 1080px);
  margin: 0 auto;
  padding: 3rem clamp(1rem, 4vw, 4.5rem) 5rem;
}

.doc-hero,
.index-hero {
  border-bottom: 1px solid var(--line);
  padding-bottom: 2rem;
}

.kicker {
  margin: 0 0 0.85rem;
  color: var(--rust);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.doc-hero h1,
.index-hero h1 {
  max-width: 980px;
  margin: 0;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: clamp(2.1rem, 5vw, 5.2rem);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 0.98;
}

.subtitle,
.index-hero p:not(.kicker) {
  max-width: 760px;
  margin: 1.2rem 0 0;
  color: var(--muted);
  font-size: 1.06rem;
}

.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.2rem;
}

.doc-meta span,
.doc-meta a {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel-bg);
  padding: 0.34rem 0.68rem;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.doc-meta a:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.section-nav {
  margin: 1.7rem 0 2.2rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-bg);
  padding: 1.1rem;
}

.section-nav h2 {
  margin: 0 0 0.6rem;
  color: var(--muted);
  font-size: 0.74rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.section-nav ol {
  columns: 2;
  gap: 1.4rem;
  margin: 0;
  padding-left: 1.1rem;
}

.section-nav li {
  break-inside: avoid;
  margin: 0 0 0.32rem;
  padding-left: 0.15rem;
  line-height: 1.35;
}

.section-nav .depth-3 {
  color: var(--muted);
  font-size: 0.92rem;
}

.prose {
  max-width: 860px;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4,
.prose h5,
.prose h6 {
  position: relative;
  margin: 2.25em 0 0.55em;
  color: var(--ink);
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.1;
}

.prose h1 {
  font-size: 2.2rem;
}

.prose h2 {
  border-top: 1px solid var(--line);
  padding-top: 1.1rem;
  font-size: 1.72rem;
}

.prose h3 {
  color: var(--accent-strong);
  font-family: var(--font-sans);
  font-size: 1.08rem;
}

.anchor {
  position: absolute;
  left: -1.25rem;
  color: var(--line);
  font-family: var(--font-sans);
  font-size: 1rem;
  opacity: 0;
  text-decoration: none;
}

.prose h1:hover .anchor,
.prose h2:hover .anchor,
.prose h3:hover .anchor,
.prose h4:hover .anchor,
.anchor:focus {
  opacity: 1;
}

.prose p,
.prose li {
  font-size: 1rem;
}

.prose p {
  margin: 0.85rem 0;
}

.prose ul,
.prose ol {
  margin: 0.85rem 0 1.15rem;
  padding-left: 1.35rem;
}

.prose li + li {
  margin-top: 0.45rem;
}

.prose strong {
  color: var(--strong-ink);
  font-weight: 800;
}

.prose blockquote {
  margin: 1.4rem 0;
  border-left: 5px solid var(--accent);
  background: var(--quote-bg);
  padding: 1rem 1.15rem;
  color: var(--quote-ink);
}

.prose blockquote p {
  margin: 0;
}

.prose details.disclosure {
  margin: 1.25rem 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-bg);
  padding: 0.9rem 1rem;
}

.prose details.disclosure[open] {
  background: var(--surface);
}

.prose details.disclosure summary {
  color: var(--accent-strong);
  font-weight: 800;
  cursor: pointer;
}

.prose details.disclosure summary::marker {
  color: var(--rust);
}

.prose details.disclosure > *:last-child {
  margin-bottom: 0;
}

.prose hr {
  width: 100%;
  height: 1px;
  margin: 2rem 0;
  border: 0;
  background: var(--line);
}

code {
  border-radius: 5px;
  background: var(--code-bg);
  padding: 0.1rem 0.26rem;
  color: var(--code-ink);
  font-family: var(--font-mono);
  font-size: 0.9em;
}

pre {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--pre-bg);
  padding: 1rem;
}

pre code {
  background: transparent;
  padding: 0;
  color: var(--pre-ink);
}

.diagram {
  margin: 1.6rem 0;
  overflow: visible;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-strong);
  padding: 1rem;
}

.diagram pre {
  margin: 0;
  overflow: visible;
  border: 0;
  background: transparent;
  padding: 0;
}

.diagram .mermaid {
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.35;
}

.diagram-fallback figcaption {
  margin-bottom: 0.75rem;
  color: var(--muted-ink);
  font-weight: 800;
}

.diagram-fallback .mermaid-source {
  white-space: pre-wrap;
}

.diagram-viewport {
  overflow-x: auto;
  overflow-y: visible;
  padding-bottom: 0.2rem;
}

.diagram-render {
  width: 100%;
  min-width: 0;
}

.diagram-render-dark {
  display: none;
}

.diagram svg {
  display: block;
  max-width: 100% !important;
  height: auto;
  margin: 0 auto;
  overflow: visible;
}

.diagram-size-toggle {
  display: block;
  margin: 0 0 0.5rem auto;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.35rem 0.6rem;
  background: var(--surface);
  color: var(--accent-strong);
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
}

.diagram-size-toggle:focus-visible,
.diagram-viewport:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.diagram-is-expanded .diagram-render {
  width: max-content;
  min-width: 100%;
}

.diagram-is-expanded svg {
  max-width: none !important;
}

.diagram figcaption {
  margin-top: 0.75rem;
  border-top: 1px solid var(--soft);
  padding-top: 0.65rem;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.35;
}

.architecture-variations {
  margin: 2rem 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}

.architecture-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-items: flex-start;
  border-bottom: 1px solid var(--line);
  padding: 0.8rem;
  background: var(--surface-strong);
  border-radius: 10px 10px 0 0;
}

.architecture-tablist {
  display: flex;
  flex: 1 1 28rem;
  flex-wrap: wrap;
  gap: 0.4rem;
  min-width: 0;
}

.architecture-tab,
.architecture-show-all {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.55rem 0.75rem;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 0.85rem;
  line-height: 1.4;
  text-align: left;
  cursor: pointer;
}

.architecture-tab[aria-selected="true"] {
  border-color: var(--accent);
  background: var(--accent-bg);
  color: var(--accent-strong);
  font-weight: 700;
  box-shadow: inset 0 -3px 0 var(--accent);
}

.architecture-tab:hover,
.architecture-show-all:hover {
  background: var(--accent-bg-hover);
}

.architecture-tab:focus-visible,
.architecture-show-all:focus-visible,
.architecture-panel:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.architecture-panel {
  padding: 0.3rem 1.2rem 0.8rem;
}

.architecture-panel > :first-child {
  margin-top: 1rem;
}

.architecture-panel[hidden],
.architecture-tablist[hidden] {
  display: none;
}

.is-showing-all .architecture-panel + .architecture-panel {
  border-top: 1px solid var(--line);
}

.review-chapter {
  margin-top: 4rem;
  scroll-margin-top: 1.5rem;
}

.review-chapter > .review-chapter-title {
  border-top: 3px solid var(--accent);
  padding-top: 1.5rem;
  color: var(--ink);
  font-size: 2rem;
}

.review-chapter > h3 {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 1.55rem;
}

.review-chapter h4 {
  color: var(--accent-strong);
  font-family: var(--font-sans);
  font-size: 1.08rem;
}

@media print {
  .architecture-controls,
  .diagram-size-toggle,
  .site-nav,
  .section-nav,
  .pager,
  .skip-link {
    display: none !important;
  }

  .layout {
    display: block;
  }

  .architecture-variations,
  .architecture-panel {
    border: 0;
    padding: 0;
    background: transparent;
  }

  .architecture-panel[hidden] {
    display: block !important;
  }

  .diagram-viewport {
    overflow: visible;
  }

  .diagram-render,
  .diagram-is-expanded .diagram-render {
    width: 100%;
    min-width: 0;
  }

  .diagram svg,
  .diagram-is-expanded svg {
    max-width: 100% !important;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .diagram-render-light {
    display: none;
  }

  :root:not([data-theme="light"]) .diagram-render-dark {
    display: block;
  }
}

[data-theme="dark"] .diagram-render-light {
  display: none;
}

[data-theme="dark"] .diagram-render-dark {
  display: block;
}

[data-theme="light"] .diagram-render-light {
  display: block;
}

[data-theme="light"] .diagram-render-dark {
  display: none;
}

.citation {
  border-radius: 5px;
  background: var(--citation-bg);
  padding: 0.04rem 0.2rem;
  color: var(--citation-ink);
  font-family: var(--font-mono);
  font-size: 0.9em;
  text-decoration: none;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 1.1rem 0 1.4rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-strong);
}

table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th,
td {
  border-bottom: 1px solid var(--soft);
  padding: 0.68rem 0.72rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--table-header-bg);
  color: var(--ink);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

tr:last-child td {
  border-bottom: 0;
}

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
  border-top: 1px solid var(--line);
  padding-top: 1.25rem;
}

.pager-link {
  display: grid;
  gap: 0.2rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-bg);
  padding: 1rem;
  color: var(--ink);
  text-decoration: none;
}

.pager-link.next {
  text-align: right;
}

.pager-link span {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.pager-link strong {
  line-height: 1.25;
}

.index-section {
  margin-top: 3rem;
}

.index-section h2 {
  margin: 0 0 1.1rem;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.15rem);
  line-height: 1.08;
}

.index-group {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  padding-top: 1.35rem;
}

.index-group:first-child {
  margin-top: 0;
  border-top: 0;
  padding-top: 0;
}

.index-group header p {
  margin: 0;
  color: var(--muted);
  max-width: 760px;
  font-size: 0.98rem;
  line-height: 1.55;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.card-grid.featured {
  grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
  align-items: stretch;
  margin-bottom: 0.65rem;
}

.index-card a {
  position: relative;
  display: grid;
  min-height: 13rem;
  grid-template-rows: auto auto 1fr;
  align-content: stretch;
  gap: 0.72rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(var(--surface-rgb), 0.94), var(--card-bg)),
    var(--surface);
  padding: 1.05rem;
  color: var(--ink);
  text-decoration: none;
  box-shadow:
    0 1px 0 var(--inset-highlight) inset,
    0 10px 26px rgba(42, 34, 24, 0.045);
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    box-shadow 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.index-card a::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  opacity: 0.82;
}

.index-card a:hover,
.index-card a:focus-visible {
  border-color: var(--accent);
  background:
    linear-gradient(180deg, var(--accent-bg-hover), var(--card-bg)),
    var(--surface);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.index-card a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.card-number {
  width: fit-content;
  border-bottom: 2px solid var(--gold);
  background: transparent;
  padding: 0 0 0.16rem;
  color: var(--rust);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.index-card h3 {
  margin: 0;
  color: var(--strong-ink);
  font-family: var(--font-serif);
  font-size: 1.18rem;
  line-height: 1.12;
  overflow-wrap: anywhere;
}

.index-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.48;
  overflow-wrap: anywhere;
}

.index-card small {
  align-self: end;
  border-top: 1px solid var(--soft);
  padding-top: 0.62rem;
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  overflow-wrap: anywhere;
}

.index-card.is-featured a {
  min-height: 17rem;
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  background:
    linear-gradient(135deg, var(--accent-bg) 0%, rgba(var(--surface-rgb), 0.95) 52%, var(--surface-strong) 100%),
    var(--surface);
  padding: clamp(1.15rem, 2vw, 1.45rem);
}

.index-card.is-featured h3 {
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
}

.index-card.is-featured p {
  max-width: 34rem;
  font-size: 1rem;
}

.card-grid.featured .index-card:not(.is-featured) a {
  min-height: 12.5rem;
}

.card-grid.compact .index-card a {
  min-height: 10.5rem;
}

.thread-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
  margin: 1.5rem 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-bg);
  padding: 1rem;
}

.thread-filter {
  display: flex;
  flex: 1 1 100%;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 0.35rem 0 0;
  border: 0;
  padding: 0;
}

.thread-filter legend {
  flex: 0 0 100%;
  margin-bottom: 0.1rem;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.thread-filter label {
  gap: 0.42rem;
  min-height: 2.15rem;
  padding: 0.38rem 0.62rem;
}

.thread-filter input {
  accent-color: var(--accent);
}

.thread-actions input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.thread-actions p {
  flex-basis: 100%;
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.thread-overview {
  margin: 1.5rem 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card-bg);
  padding: 1rem;
}

.thread-overview h2 {
  margin: 0 0 0.75rem;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 1.32rem;
}

.thread-overview-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.65rem;
}

.thread-overview-grid div {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 0.7rem;
}

.thread-overview-grid strong {
  display: block;
  color: var(--accent-strong);
  font-size: 1.25rem;
  line-height: 1;
}

.thread-overview-grid span {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1.35;
  text-transform: uppercase;
}

.thread-overview-actions {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

.thread-map {
  margin: 1.5rem 0 2rem;
}

.thread-map h2,
.thread-source h2 {
  margin: 0 0 0.75rem;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 1.45rem;
}

.thread-map ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.thread-map li {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card-bg);
  padding: 0.7rem 0.8rem;
}

.thread-map span,
.thread-id {
  border-radius: 999px;
  background: var(--accent-bg);
  padding: 0.14rem 0.5rem;
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 800;
}

.thread-source {
  margin: 2rem 0 1rem;
  border-top: 1px solid var(--line);
  padding-top: 1.2rem;
}

.thread-source p {
  margin: 0;
  color: var(--muted);
}

.thread-list {
  display: grid;
  gap: 1rem;
}

.thread-card {
  scroll-margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card-bg);
  padding: 1rem;
  box-shadow: 0 1px 0 var(--inset-highlight) inset;
}

.thread-card header {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 0.75rem;
}

.thread-card h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.35;
}

.thread-card header a {
  font-size: 0.88rem;
}

.thread-relations {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.thread-id {
  width: fit-content;
  margin: 0;
}

.thread-heading-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.7rem;
}

.thread-current {
  display: grid;
  gap: 0.75rem;
  margin: 0 0 0.85rem;
}

.thread-current.is-stale {
  border-left: 3px solid var(--gold);
  padding-left: 0.75rem;
}

.thread-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.thread-chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--accent-bg);
  padding: 0.18rem 0.55rem;
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 850;
  line-height: 1.3;
}

.thread-chip.action {
  background: var(--surface);
  color: var(--ink);
}

.thread-chip.muted {
  background: var(--panel-bg);
  color: var(--muted);
}

.thread-chip.warning {
  border-color: var(--gold);
  background: var(--citation-bg);
  color: var(--rust);
}

.thread-target-line {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.thread-target-line strong {
  color: var(--ink);
}

.thread-lanes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.thread-lane {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 0.75rem;
}

.thread-lane h3,
.thread-source-text summary,
.thread-fields summary {
  margin: 0 0 0.28rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.thread-lane p {
  margin: 0;
  color: var(--ink);
  font-size: 0.9rem;
  line-height: 1.5;
}

.thread-lane p + p {
  margin-top: 0.55rem;
}

.user-lane {
  border-color: color-mix(in srgb, var(--accent) 32%, var(--line));
}

.agent-lane {
  border-color: color-mix(in srgb, var(--gold) 38%, var(--line));
}

.thread-context {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 0.65rem 0.75rem;
}

.thread-context.is-stale {
  border-color: var(--gold);
  background: var(--citation-bg);
}

.thread-context summary {
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
}

.thread-context dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
  margin: 0.75rem 0;
}

.thread-context dl div {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--panel-bg);
  padding: 0.55rem 0.65rem;
}

.thread-context dt,
.thread-context h3 {
  margin: 0 0 0.18rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.thread-context dd,
.thread-context p,
.thread-context ul {
  margin: 0;
  color: var(--ink);
  font-size: 0.9rem;
  line-height: 1.5;
}

.thread-context section {
  margin-top: 0.75rem;
}

.thread-context ul {
  padding-left: 1.15rem;
}

.thread-context .thread-warning {
  margin-top: 0.65rem;
  color: var(--rust);
  font-weight: 700;
}

.thread-source-text {
  margin: 0.65rem 0 0.85rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-bg);
  padding: 0.6rem 0.7rem;
}

.thread-source-text summary,
.thread-fields summary {
  cursor: pointer;
}

.thread-source-text p {
  margin: 0.45rem 0 0;
  color: var(--ink);
  font-size: 0.9rem;
  line-height: 1.5;
}

.thread-quick-fields,
.thread-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.thread-fields {
  margin-top: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-bg);
  padding: 0.7rem 0.75rem;
}

.thread-fields summary {
  grid-column: 1 / -1;
}

.thread-quick-fields {
  align-items: start;
}

.thread-quick-fields label,
.thread-fields label {
  display: grid;
  gap: 0.34rem;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.thread-quick-fields label:has(textarea),
.thread-fields label:has(textarea) {
  grid-column: 1 / -1;
}

.thread-quick-fields select,
.thread-quick-fields textarea,
.thread-fields select,
.thread-fields textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
  padding: 0.65rem 0.7rem;
  color: var(--ink);
  font: inherit;
  font-size: 0.94rem;
  line-height: 1.45;
  text-transform: none;
  letter-spacing: 0;
}

.thread-fields textarea {
  resize: vertical;
}

.thread-fields select:focus,
.thread-fields textarea:focus,
.theme-toggle:focus,
.thread-actions button:focus,
.thread-filter input:focus-visible,
.import-control:focus-within {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.batch-list {
  display: grid;
  gap: 1rem;
  margin-top: 1.6rem;
}

.batch-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card-bg);
  padding: 1rem;
}

.batch-card header {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 0.9rem;
}

.batch-card h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 1.4rem;
  line-height: 1.15;
}

.batch-card p {
  margin: 0;
  color: var(--muted);
}

.batch-card dl {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
  gap: 0.75rem;
  margin: 1rem 0;
}

.batch-card dl div {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-bg);
  padding: 0.75rem;
}

.batch-card dt {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.batch-card dd {
  margin: 0.25rem 0 0;
  color: var(--ink);
}

.batch-card details {
  border-top: 1px solid var(--line);
  padding: 0.8rem 0 0;
}

.batch-card details + details {
  margin-top: 0.8rem;
}

.batch-card summary {
  color: var(--accent-strong);
  cursor: pointer;
  font-weight: 800;
}

.batch-card ol {
  margin-bottom: 0;
  padding-left: 1.25rem;
}

@media (max-width: 920px) {
  .layout {
    display: block;
  }

  .index-shell .layout {
    display: flex;
    flex-direction: column;
  }

  .site-nav {
    position: relative;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .index-shell .site-nav {
    order: 2;
    border-top: 1px solid var(--line);
    border-bottom: 0;
  }

  .index-shell .index-page {
    order: 1;
  }

  .site-nav ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .document,
  .index-page {
    padding-top: 2rem;
  }

  .section-nav ol {
    columns: 1;
  }

  .thread-map ol {
    grid-template-columns: 1fr;
  }

  .thread-overview-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .batch-card dl {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  body {
    background-size: 24px 24px;
  }

  .site-nav ol,
  .card-grid,
  .thread-lanes,
  .thread-overview-grid,
  .thread-quick-fields,
  .thread-fields,
  .thread-context dl {
    grid-template-columns: 1fr;
  }

  .doc-hero h1,
  .index-hero h1 {
    font-size: 2.25rem;
    line-height: 1.04;
  }

  .card-grid.featured {
    grid-template-columns: 1fr;
  }

  .index-card.is-featured a {
    min-height: 14rem;
  }

  .pager {
    grid-template-columns: 1fr;
  }

  .pager-link.next {
    text-align: left;
  }

  .anchor {
    display: none;
  }
}

/* Reader navigation: emphasize location, and keep provisional research folded away. */
.site-nav a[aria-current="page"],
.site-nav a[aria-current="location"] {
  border: 2px solid var(--accent);
  border-left-width: 6px;
  background: var(--accent-bg);
  padding-left: 0.4rem;
  color: var(--accent-strong);
  box-shadow: 0 0 0 2px var(--surface-strong);
}

.site-nav a[aria-current="page"] span,
.site-nav a[aria-current="location"] span {
  font-size: 0.96rem;
  font-weight: 900;
}

.site-nav a[aria-current="page"] small,
.site-nav a[aria-current="location"] small {
  color: var(--accent-strong);
  font-weight: 800;
}

.site-nav .nav-folder-item {
  min-width: 0;
  margin-top: 0.75rem;
  border-top: 1px solid var(--line);
  padding-top: 0.75rem;
}

.site-nav .nav-folder > summary,
.site-nav .nav-subfolder > summary {
  position: relative;
  display: grid;
  gap: 0.15rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-bg);
  padding: 0.7rem 2rem 0.7rem 0.75rem;
  color: var(--ink);
  line-height: 1.35;
  cursor: pointer;
  list-style: none;
}

.site-nav .nav-folder > summary::-webkit-details-marker,
.site-nav .nav-subfolder > summary::-webkit-details-marker {
  display: none;
}

.site-nav .nav-folder > summary::after,
.site-nav .nav-subfolder > summary::after {
  position: absolute;
  top: 0.6rem;
  right: 0.72rem;
  color: var(--accent-strong);
  font-size: 1.15rem;
  content: "⌄";
  transform: rotate(-90deg);
  transition: transform 0.15s ease;
}

.site-nav .nav-folder[open] > summary::after,
.site-nav .nav-subfolder[open] > summary::after {
  transform: rotate(0);
}

.site-nav .nav-folder > summary:hover,
.site-nav .nav-subfolder > summary:hover,
.site-nav .nav-folder[open] > summary {
  border-color: var(--accent);
  background: var(--accent-bg);
  color: var(--accent-strong);
}

.site-nav .nav-folder > summary:focus-visible,
.site-nav .nav-subfolder > summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.site-nav .nav-folder > summary > span {
  font-size: 0.96rem;
  font-weight: 900;
}

.site-nav .nav-folder ol {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.25rem;
  margin: 0.35rem 0 0 0.45rem;
  border-left: 2px solid var(--line);
  padding: 0 0 0 0.4rem;
}

.site-nav .nav-subheading {
  margin: 0.65rem 0 0.3rem;
  padding: 0 0.55rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.site-nav .nav-subfolder-item {
  min-width: 0;
}

.site-nav .nav-subfolder > summary {
  margin: 0.3rem 0;
  font-size: 0.81rem;
  font-weight: 800;
}

.site-nav .nav-subfolder > summary small {
  font-weight: 600;
  letter-spacing: normal;
  text-transform: none;
}

.site-nav .nav-subfolder ol {
  margin-top: 0.1rem;
  margin-bottom: 0.5rem;
}

.site-nav .nav-subfolder a small {
  text-transform: none;
  letter-spacing: normal;
  font-size: 0.65rem;
  line-height: 1.35;
}

/* Proximity snap preserves free reading within long chapters, while generous
   chapter endings create a deliberate threshold before the next chapter. */
html.review-scroll {
  scroll-snap-type: y proximity;
  scroll-padding-top: 1.25rem;
}

.review-document .review-chapter {
  min-height: 90vh;
  margin: 0;
  border-top: 2px solid var(--line);
  padding: clamp(3rem, 9vh, 6rem) 0 clamp(8rem, 21vh, 17rem);
  scroll-margin-top: 1.25rem;
  scroll-snap-align: start;
}

.review-document .review-reader-chapters .review-chapter:first-child {
  border-top: 0;
}

.review-document .review-chapter > .review-chapter-title {
  margin: 0 0 1.6rem;
  border-top: 0;
  padding-top: 0;
  font-size: clamp(1.9rem, 3.4vw, 2.6rem);
}

.review-chapter-end {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.8rem;
  margin-top: clamp(5rem, 14vh, 10rem);
  border-top: 1px dashed var(--line);
  padding-top: 1.2rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.review-research-gate {
  display: flex;
  min-height: 68vh;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 4rem;
  border-top: 4px solid var(--accent);
  border-bottom: 1px solid var(--line);
  background: var(--panel-bg);
  padding: clamp(2rem, 6vw, 5rem);
  scroll-snap-align: start;
  scroll-margin-top: 1.25rem;
}

.review-research-gate h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  line-height: 1.15;
}

.review-research-gate p:not(.kicker) {
  max-width: 62ch;
  margin: 0;
  color: var(--muted);
}

.review-research-gate button {
  min-height: 3.25rem;
  margin-top: 0.6rem;
  border: 2px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  padding: 0.8rem 1.35rem;
  color: var(--bg);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 900;
  cursor: pointer;
}

.review-research-gate button:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.review-research-gate button:focus-visible {
  outline: 3px solid var(--accent-strong);
  outline-offset: 4px;
}

.review-research-gate.is-open {
  min-height: 35vh;
}

.review-research-content[hidden] {
  display: none !important;
}

@media (max-width: 920px) {
  .site-nav > ol > .nav-folder-item {
    grid-column: 1 / -1;
  }

  html.review-scroll {
    scroll-snap-type: none;
  }

  .review-document .review-chapter {
    min-height: 0;
    padding: 3rem 0 6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  html.review-scroll {
    scroll-snap-type: none;
  }

  .site-nav .nav-folder > summary::after,
  .site-nav .nav-subfolder > summary::after {
    transition: none;
  }
}

@media print {
  html.review-scroll {
    scroll-snap-type: none;
  }

  .review-document .review-chapter {
    min-height: 0;
    padding: 1.5rem 0;
    break-inside: auto;
  }

  .review-research-gate {
    display: none;
  }

  .review-research-content[hidden] {
    display: block !important;
  }
}