/* Basicdoc model atlas — technical manuscript */
:root {
  --ink: #0a1628;
  --ink-soft: #152536;
  --slate: #243647;
  --mist: #8a9aab;
  --line: #d4c9b5;
  --parchment: #f3ebe0;
  --paper: #fffaf2;
  --copper: #b85a2a;
  --copper-deep: #8f4219;
  --cyan: #2f6f82;
  --cyan-soft: #c5dde4;
  --ok: #2d6a4f;
  --shadow: 0 18px 50px rgba(10, 22, 40, 0.12);
  --radius: 2px;
  --max: 1180px;
  --serif: "Fraunces", "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  --sans: "Source Sans 3", "Source Sans Pro", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(47, 111, 130, 0.12), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(184, 90, 42, 0.08), transparent 55%),
    linear-gradient(180deg, #f7f1e7 0%, var(--parchment) 40%, #efe6d7 100%);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.55;
  font-weight: 400;
}

a {
  color: var(--cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

a:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* —— shell —— */
.site-header {
  border-bottom: 1px solid color-mix(in srgb, var(--line) 80%, var(--ink));
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner,
.footer-inner,
.wrap {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.9rem 0;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  text-decoration: none;
  color: inherit;
}

.brand-kicker {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper);
}

.brand-title {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  font-size: 0.92rem;
}

.nav a {
  color: var(--slate);
  text-decoration: none;
  font-weight: 600;
}

.nav a[aria-current="page"],
.nav a:hover {
  color: var(--copper-deep);
}

.site-footer {
  margin-top: 4rem;
  border-top: 1px solid var(--line);
  padding: 1.75rem 0 2.5rem;
  color: var(--mist);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

/* —— hero / index —— */
.hero {
  padding: 3.25rem 0 1.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr;
  gap: 2rem;
  align-items: end;
}

@media (max-width: 820px) {
  .hero-grid { grid-template-columns: 1fr; }
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 0.85rem;
}

.hero h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
}

.hero-lead {
  max-width: 38rem;
  color: var(--slate);
  font-size: 1.08rem;
  margin: 0;
}

.hero-meta {
  display: grid;
  gap: 0.85rem;
  padding: 1.2rem 1.3rem;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-meta dt {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--paper) 55%, var(--cyan-soft));
  margin: 0;
}

.hero-meta dd {
  margin: 0.15rem 0 0;
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 500;
}

/* —— reading rule: frames how every plate is to be interpreted —— */
.reading-rule {
  display: grid;
  gap: 0.4rem;
  margin: 0 0 2rem;
  padding: 1.15rem 1.3rem 1.25rem;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius);
  border-left: 4px solid var(--copper);
  box-shadow: var(--shadow);
}

.reading-rule strong {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--paper) 60%, var(--cyan-soft));
}

.reading-rule p {
  margin: 0;
  max-width: 46rem;
  color: color-mix(in srgb, var(--paper) 88%, var(--cyan-soft));
}

.reading-rule code {
  font-family: var(--mono);
  font-size: 0.85em;
  color: var(--cyan-soft);
}

.reading-rule em {
  font-style: italic;
  color: var(--paper);
}

/* —— filters —— */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 0.85rem;
  margin: 0 0 1.5rem;
}

.toolbar label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
}

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

.chip {
  appearance: none;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 80%, white);
  color: var(--slate);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  cursor: pointer;
}

.chip[aria-pressed="true"],
.chip:hover {
  border-color: var(--copper);
  color: var(--copper-deep);
  background: color-mix(in srgb, var(--copper) 10%, var(--paper));
}

.search {
  margin-left: auto;
  min-width: min(100%, 16rem);
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  font: inherit;
  color: var(--ink);
}

.search:focus {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-color: transparent;
}

/* —— plate grid —— */
.plate-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(16.5rem, 1fr));
  gap: 1.15rem;
  padding-bottom: 3rem;
  list-style: none;
  margin: 0;
  padding-left: 0;
}

.plate-card {
  display: flex;
  flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 1px 0 rgba(10, 22, 40, 0.04);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
  min-height: 100%;
}

.plate-card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--copper) 45%, var(--line));
  box-shadow: var(--shadow);
}

.plate-frame {
  position: relative;
  aspect-ratio: 16 / 11;
  background:
    linear-gradient(180deg, #faf6ef, #f0e8db);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.plate-frame::before,
.plate-frame::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border: 1.5px solid var(--copper);
  opacity: 0.7;
  z-index: 2;
  pointer-events: none;
}

.plate-frame::before {
  top: 8px;
  left: 8px;
  border-right: 0;
  border-bottom: 0;
}

.plate-frame::after {
  right: 8px;
  bottom: 8px;
  border-left: 0;
  border-top: 0;
}

.plate-frame img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 0.85rem;
  display: block;
}

.plate-body {
  padding: 0.9rem 1rem 1.05rem;
  display: grid;
  gap: 0.35rem;
}

.plate-no {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--copper);
}

.plate-body h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.plate-meta {
  font-size: 0.84rem;
  color: var(--mist);
}

.domain-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: 0.35rem;
}

.domain-tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  padding: 0.15rem 0.4rem;
  background: var(--cyan-soft);
  color: var(--ink-soft);
  border-radius: 2px;
}

.plate-card.is-hidden {
  display: none;
}

.empty-state {
  display: none;
  padding: 2rem;
  text-align: center;
  color: var(--mist);
  border: 1px dashed var(--line);
  background: color-mix(in srgb, var(--paper) 70%, transparent);
}

.empty-state.is-visible {
  display: block;
}

/* —— tier legend —— */
.tier-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.6rem;
}

.tier {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.25rem 0.55rem;
  border: 1px solid color-mix(in srgb, var(--paper) 35%, transparent);
  border-radius: 2px;
  color: var(--paper);
}

.tier + .tier::before { content: "⊃ "; opacity: 0.6; }

.tier-note {
  font-size: 0.8rem;
  color: color-mix(in srgb, var(--paper) 60%, var(--cyan-soft));
  margin-left: 0.4rem;
  font-style: italic;
}

/* —— index chapters —— */
.chapter { margin-bottom: 2.25rem; }

.chapter-head {
  display: grid;
  gap: 0.2rem;
  margin-bottom: 0.9rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--line);
}

.chapter-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.6rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.chapter-head p {
  margin: 0;
  color: var(--mist);
  font-size: 0.95rem;
}

.chapter-link {
  font-family: var(--mono);
  font-size: 0.78rem;
  text-decoration: none;
  margin-top: 0.2rem;
}

.chapter-link:hover { color: var(--copper); }

.plate-body h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

/* —— model definitions —— */
.defs { margin-bottom: 2rem; }

.defs-heading {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 500;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.type-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  padding: 1rem 1.2rem 1.1rem;
  margin-bottom: 1rem;
  scroll-margin-top: 5rem;
}

.type-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem;
}

.type-head h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.kind {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.15rem 0.45rem;
  background: var(--cyan-soft);
  color: var(--ink-soft);
  border-radius: 2px;
}

.type-src {
  margin-left: auto;
  font-size: 0.8rem;
  text-decoration: none;
}

.type-src code { word-break: break-all; }

.type-defn {
  margin: 0.5rem 0 0;
  color: var(--slate);
}

.attr-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

.attr-table th {
  text-align: left;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mist);
  font-weight: 500;
  border-bottom: 1px solid var(--line);
  padding: 0.35rem 0.5rem 0.35rem 0;
}

.attr-table td {
  border-bottom: 1px solid color-mix(in srgb, var(--line) 55%, transparent);
  padding: 0.45rem 0.5rem 0.45rem 0;
  vertical-align: top;
}

.attr-defn { color: var(--slate); }

.enum-values {
  margin: 0.6rem 0 0;
  display: grid;
  gap: 0.3rem;
}

.enum-values div {
  display: grid;
  grid-template-columns: minmax(7rem, auto) 1fr;
  gap: 0.6rem;
}

.enum-values dt { margin: 0; }

.enum-values dd { margin: 0; color: var(--slate); }
.model-page {
  padding: 2.25rem 0 3.5rem;
}

.model-head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem 2rem;
  align-items: start;
  margin-bottom: 1.5rem;
}

@media (max-width: 720px) {
  .model-head { grid-template-columns: 1fr; }
}

.model-head h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2rem, 4vw, 2.85rem);
  letter-spacing: -0.03em;
  margin: 0.2rem 0 0.55rem;
  line-height: 1.08;
}

.model-summary {
  color: var(--slate);
  max-width: 42rem;
  margin: 0;
}

.crumb {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--mist);
  margin: 0 0 0.65rem;
}

.crumb a {
  color: inherit;
  text-decoration: none;
}

.crumb a:hover {
  color: var(--copper);
}

.side-stats {
  display: grid;
  gap: 0.55rem;
  min-width: 11rem;
}

.stat {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 0.65rem 0.8rem;
}

.stat b {
  display: block;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
  font-weight: 500;
}

.stat span {
  font-family: var(--serif);
  font-size: 1.2rem;
}

.diagram-stage {
  position: relative;
  background:
    linear-gradient(180deg, #fffdf9, #f7f0e4);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: clamp(1rem, 3vw, 2rem);
  margin: 0 0 2rem;
}

.diagram-stage::before,
.diagram-stage::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--copper);
  opacity: 0.75;
  pointer-events: none;
}

.diagram-stage::before {
  top: 10px;
  left: 10px;
  border-right: 0;
  border-bottom: 0;
}

.diagram-stage::after {
  right: 10px;
  bottom: 10px;
  border-left: 0;
  border-top: 0;
}

.diagram-stage img {
  display: block;
  width: 100%;
  height: auto;
  max-height: min(78vh, 920px);
  object-fit: contain;
  margin-inline: auto;
  background: transparent;
}

.panel-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.25rem;
}

@media (max-width: 860px) {
  .panel-grid { grid-template-columns: 1fr; }
}

.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 1.1rem 1.2rem 1.25rem;
}

.panel h2 {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 500;
  margin: 0 0 0.85rem;
  letter-spacing: -0.02em;
}

.include-list,
.domain-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.include-list li,
.domain-list li {
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.35;
  padding: 0.45rem 0.55rem;
  background: color-mix(in srgb, var(--parchment) 70%, white);
  border-left: 2px solid var(--cyan);
  word-break: break-all;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.pager a {
  text-decoration: none;
  color: var(--slate);
  font-weight: 600;
}

.pager a:hover {
  color: var(--copper);
}

.pager span {
  display: block;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
  margin-bottom: 0.2rem;
}

.note {
  margin-top: 1.5rem;
  padding: 0.9rem 1rem;
  border: 1px solid color-mix(in srgb, var(--copper) 35%, var(--line));
  background: color-mix(in srgb, var(--copper) 7%, var(--paper));
  font-size: 0.95rem;
}

.note strong {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--copper-deep);
  display: block;
  margin-bottom: 0.35rem;
}

/* —— deep-link anchors —— */
.type-head h3 .anchor {
  margin-left: 0.45rem;
  font-size: 0.85rem;
  text-decoration: none;
  opacity: 0;
  transition: opacity 120ms ease;
}

.type-card:hover .anchor,
.type-head h3 .anchor:focus-visible {
  opacity: 0.65;
}

.anchor:hover { opacity: 1 !important; color: var(--copper); }