/* Shared design system for project pages and long-form notes. */
:root {
  color-scheme: light dark;
  --font-sans: "Segoe UI Variable", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  --page-max: 1200px;
  --article-max: 760px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --radius-xs: 3px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --duration-fast: 120ms;
  --duration-ui: 220ms;

  --bg: #f3f1ea;
  --surface: #fcfbf7;
  --text: #162022;
  --muted: #566364;
  --line: #c9ceca;
  --line-strong: #879391;
  --brand: #0b6f75;
  --brand-strong: #07555b;
  --on-brand: #ffffff;
  --resource-source: #5b3d8f;
  --resource-dataset: #17643e;
  --resource-note: #8a4b00;
  --focus: #1769e0;
  --code-bg: #132023;
  --code-text: #e8f2ef;
  --header-bg: rgba(243, 241, 234, 0.9);
  --grid-line: rgba(22, 32, 34, 0.04);
  --dialog-backdrop: rgba(10, 16, 18, 0.72);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a1012;
    --surface: #11191b;
    --text: #edf2ee;
    --muted: #a8b3ae;
    --line: #334043;
    --line-strong: #657376;
    --brand: #56c7c8;
    --brand-strong: #8de2df;
    --on-brand: #0a1012;
    --resource-source: #d1b9ff;
    --resource-dataset: #83dca5;
    --resource-note: #f2bf78;
    --focus: #8fb5ff;
    --code-bg: #050a0b;
    --code-text: #e8f2ef;
    --header-bg: rgba(10, 16, 18, 0.88);
    --grid-line: rgba(237, 242, 238, 0.035);
    --dialog-backdrop: rgba(0, 0, 0, 0.76);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 7rem;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 24px 24px;
  font-family: var(--font-sans);
  font-size: clamp(1rem, 0.96rem + 0.15vw, 1.075rem);
  line-height: 1.68;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body,
a,
button,
td,
th {
  overflow-wrap: anywhere;
}

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

a {
  color: var(--brand-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

a:hover {
  text-decoration-thickness: 2px;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

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

::selection {
  color: var(--on-brand);
  background: var(--brand-strong);
}

h1,
h2,
h3,
h4,
p,
figure,
dl,
dd,
ol,
ul {
  margin-top: 0;
}

h1,
h2,
h3,
h4 {
  color: var(--text);
  line-height: 1.12;
  text-wrap: balance;
}

code,
pre {
  font-family: var(--font-mono);
}

code {
  padding: 0.12em 0.35em;
  color: var(--brand-strong);
  background: color-mix(in srgb, var(--brand) 9%, transparent);
  border-radius: var(--radius-xs);
  font-size: 0.92em;
}

.content-container {
  width: min(100% - (2 * var(--gutter)), var(--page-max));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: var(--space-4);
  left: var(--space-4);
  z-index: 100;
  padding: 0.7rem 1rem;
  color: var(--surface);
  background: var(--text);
  border-radius: var(--radius-xs);
  transform: translateY(-160%);
  transition: transform var(--duration-fast) ease;
}

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

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

[hidden] {
  display: none !important;
}

/* Shared header */
.content-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--line);
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.header-inner {
  min-height: auto;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  column-gap: var(--space-6);
  row-gap: 0;
  padding-block: var(--space-3);
}

.content-brand {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--text);
  line-height: 1.1;
  text-decoration: none;
}

.content-brand > span[aria-hidden="true"] {
  width: 2.35rem;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  color: var(--on-brand);
  background: var(--brand-strong);
  border-radius: 50%;
  font-family: Georgia, serif;
  font-size: 1.45rem;
  font-weight: 400;
}

.content-brand > span:not([aria-hidden]) {
  display: grid;
}

.content-brand strong {
  color: var(--text);
  letter-spacing: -0.02em;
}

.content-brand small {
  margin-top: 0.25rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.content-nav {
  grid-column: 1 / -1;
  grid-row: 2;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: clamp(1rem, 2.5vw, 2rem);
  overflow-x: auto;
  padding-top: var(--space-3);
  border-top: 1px solid var(--line);
  scrollbar-width: thin;
}

.content-nav a {
  flex: 0 0 auto;
}

.content-nav a,
.content-github {
  position: relative;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-decoration: none;
  text-transform: uppercase;
}

.content-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -0.38rem;
  left: 0;
  height: 2px;
  background: var(--brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-ui) ease;
}

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

.content-nav a:hover::after,
.content-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.content-github {
  min-height: 2.7rem;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding-inline: var(--space-4);
  color: var(--on-brand);
  background: var(--brand-strong);
  border: 1px solid var(--brand-strong);
  border-radius: var(--radius-xs);
  transition: color var(--duration-fast) ease, background var(--duration-fast) ease;
}

.content-github:hover {
  color: var(--text);
  background: transparent;
}

.header-actions {
  grid-column: 2;
  grid-row: 1;
  justify-self: end;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.language-switcher {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-xs);
}

html:not(.js-enabled) .language-switcher,
html:not(.js-enabled) .catalog-toolbar,
html:not(.js-enabled) .rule-popup-trigger {
  display: none !important;
}

.language-switcher button {
  min-width: 2.5rem;
  min-height: 2.25rem;
  padding: 0.35rem 0.55rem;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.03em;
  cursor: pointer;
}

.language-switcher button:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--brand) 8%, transparent);
}

.language-switcher button[aria-pressed="true"] {
  color: var(--on-brand);
  background: var(--brand-strong);
}

/* Page framing and hero */
.content-main {
  min-height: 70vh;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding-top: var(--space-6);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.breadcrumb a {
  color: var(--muted);
}

.breadcrumb span[aria-current="page"] {
  color: var(--text);
  font-weight: 700;
}

.content-hero {
  padding-block: clamp(3.5rem, 8vw, 7rem);
}

.content-hero h1 {
  max-width: 12ch;
  margin: var(--space-4) 0 0;
  font-size: clamp(3.4rem, 8vw, 7.5rem);
  letter-spacing: -0.065em;
}

.article-hero h1 {
  max-width: 15ch;
  font-size: clamp(2.8rem, 6vw, 5.7rem);
}

.page-eyebrow,
.section-heading > p:first-child {
  margin-bottom: var(--space-3);
  color: var(--brand-strong);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.content-lead {
  max-width: 66ch;
  margin: var(--space-8) 0 0;
  color: var(--muted);
  font-size: clamp(1.12rem, 1rem + 0.55vw, 1.42rem);
  line-height: 1.65;
}

.article-hero > p:not(.page-eyebrow):not(.content-lead) {
  max-width: 70ch;
  color: var(--muted);
}

.hero-actions {
  margin-top: var(--space-8);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.button,
.ghost-button,
.button-primary,
.button-secondary {
  min-height: 2.9rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.7rem 1rem;
  color: var(--on-brand);
  background: var(--brand-strong);
  border: 1px solid var(--brand-strong);
  border-radius: var(--radius-xs);
  font-weight: 750;
  line-height: 1.2;
  text-decoration: none;
  transition: transform var(--duration-fast) ease, color var(--duration-fast) ease, background var(--duration-fast) ease, border-color var(--duration-fast) ease;
}

.ghost-button,
.button-secondary {
  color: var(--text);
  background: var(--surface);
  border-color: var(--line-strong);
}

.button:hover,
.ghost-button:hover,
.button-primary:hover,
.button-secondary:hover {
  transform: translateY(-2px);
}

.button:hover,
.button-primary:hover {
  background: var(--brand);
  border-color: var(--brand);
}

.ghost-button:hover,
.button-secondary:hover {
  border-color: var(--brand);
}

.tag-list {
  list-style: none;
  margin: var(--space-8) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  min-height: 1.9rem;
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.55rem;
  color: var(--brand-strong);
  background: color-mix(in srgb, var(--brand) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--brand) 35%, var(--line));
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
}

a.tag:hover {
  color: var(--on-brand);
  background: var(--brand-strong);
  border-color: var(--brand-strong);
}

/* Section and card system */
.content-section {
  padding-block: clamp(4.5rem, 9vw, 7.5rem);
  border-top: 1px solid var(--line-strong);
}

.section-heading {
  margin-bottom: var(--space-12);
  display: grid;
  grid-template-columns: minmax(10rem, 3fr) minmax(0, 9fr);
  column-gap: var(--space-8);
  align-items: start;
}

.section-heading > p:first-child {
  grid-row: 1 / span 2;
}

.section-heading h2 {
  max-width: 22ch;
  margin: 0;
  font-size: clamp(2rem, 4.3vw, 4rem);
  letter-spacing: -0.045em;
}

.section-heading > p:last-child:not(:first-child) {
  max-width: 68ch;
  margin: var(--space-4) 0 0;
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.card-grid + .card-grid {
  margin-top: var(--space-4);
}

.content-card {
  min-width: 0;
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.content-card > p:first-child:not(:last-child) {
  color: var(--brand-strong);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.content-card h3 {
  margin-bottom: var(--space-4);
  font-size: clamp(1.25rem, 2.1vw, 1.7rem);
  letter-spacing: -0.025em;
}

.content-card p {
  color: var(--muted);
}

.content-card > :last-child {
  margin-bottom: 0;
}

.callout {
  margin-block: var(--space-8);
  padding: var(--space-6);
  background: color-mix(in srgb, var(--brand) 7%, var(--surface));
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.callout > :last-child {
  margin-bottom: 0;
}

.content-list {
  margin: var(--space-6) 0 0;
  padding-left: 1.35rem;
  color: var(--muted);
}

.content-list li + li {
  margin-top: var(--space-4);
}

.content-list strong {
  color: var(--text);
}

/* Resource index */
.resource-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.resource-item {
  border-bottom: 1px solid var(--line);
}

.resource-item > a,
.resource-item > div {
  display: grid;
  grid-template-columns: minmax(7rem, 1.6fr) minmax(12rem, 4.4fr) minmax(12rem, 6fr);
  gap: var(--space-6);
  align-items: center;
  padding-block: var(--space-6);
  color: var(--text);
  text-decoration: none;
  transition: padding var(--duration-ui) ease, background var(--duration-ui) ease;
}

.resource-item > a:hover {
  padding-inline: var(--space-4);
  background: color-mix(in srgb, var(--brand) 7%, transparent);
}

.resource-item span {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.resource-item strong {
  color: var(--text);
  font-size: 1.05rem;
}

.resource-item small {
  color: var(--muted);
  font-size: 0.86rem;
}

.resource-list > li:not(.resource-item) {
  display: grid;
  grid-template-columns: minmax(5.5rem, auto) minmax(0, 1fr);
  gap: var(--space-3);
  align-items: baseline;
  padding-block: 0.72rem;
  border-bottom: 1px solid var(--line);
}

.resource-list > li:not(.resource-item) > span:not(.status-tag) {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.resource-list > li:not(.resource-item) > .status-tag {
  grid-column: 1 / -1;
}

.resource-list > li:not(.resource-item) > a {
  font-weight: 700;
}

/* Tables and code */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  margin-block: var(--space-8);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.table-wrap:focus-visible,
.code-block:focus-visible,
.result-matrix:focus-visible {
  outline-offset: 2px;
}

.data-table {
  width: 100%;
  min-width: 44rem;
  border-collapse: collapse;
  text-align: left;
}

.data-table-wide {
  min-width: 70rem;
}

.data-table caption {
  padding: var(--space-4) var(--space-6);
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-align: left;
  text-transform: uppercase;
}

.data-table th,
.data-table td {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.data-table thead th {
  color: var(--brand-strong);
  background: color-mix(in srgb, var(--brand) 7%, var(--surface));
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.data-table tbody th {
  color: var(--text);
}

.data-table tbody tr:last-child > * {
  border-bottom: 0;
}

.data-table tbody tr:hover {
  background: color-mix(in srgb, var(--brand) 5%, transparent);
}

.data-table .resource-list {
  min-width: 10rem;
  border-top: 0;
}

.data-table .resource-list > li:not(.resource-item) {
  display: block;
  padding-block: 0.18rem;
  border-bottom: 0;
}

.data-table .button,
.data-table .button-secondary {
  min-height: 2.35rem;
  padding: 0.45rem 0.7rem;
  font-size: 0.78rem;
}

.code-block {
  margin-block: var(--space-8);
  padding: var(--space-6);
  overflow-x: auto;
  color: var(--code-text);
  background: var(--code-bg);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  tab-size: 2;
}

.code-block code {
  padding: 0;
  color: inherit;
  background: transparent;
  font-size: 0.88rem;
  line-height: 1.65;
}

/* Long-form article layout */
.article-layout {
  padding-bottom: clamp(5rem, 10vw, 9rem);
  display: grid;
  grid-template-columns: 13rem minmax(0, var(--article-max));
  justify-content: space-between;
  gap: clamp(3rem, 8vw, 8rem);
  border-top: 1px solid var(--line-strong);
}

.article-toc {
  position: sticky;
  top: 7rem;
  align-self: start;
  max-height: calc(100vh - 9rem);
  overflow-y: auto;
  padding-top: var(--space-10);
}

.article-toc > p {
  margin-bottom: var(--space-4);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.article-toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-2);
}

.article-toc a {
  display: block;
  padding: 0.45rem 0.7rem;
  color: var(--muted);
  border-left: 2px solid var(--line);
  font-size: 0.82rem;
  line-height: 1.4;
  text-decoration: none;
}

.article-toc a:hover {
  color: var(--text);
  border-color: var(--brand);
  background: color-mix(in srgb, var(--brand) 6%, transparent);
}

.article-body {
  min-width: 0;
}

.article-section {
  padding-block: clamp(3.5rem, 8vw, 6.5rem);
  border-bottom: 1px solid var(--line-strong);
}

.article-section:last-child {
  border-bottom: 0;
}

.article-section h2 {
  margin: 0 0 var(--space-6);
  font-size: clamp(2rem, 4.2vw, 3.6rem);
  letter-spacing: -0.045em;
}

.article-section > h3 {
  margin: var(--space-10) 0 var(--space-4);
  font-size: clamp(1.35rem, 2.3vw, 1.8rem);
}

.article-section > p:not(.page-eyebrow) {
  color: var(--muted);
}

.article-section > p + p {
  margin-top: var(--space-4);
}

.article-section .card-grid {
  margin-top: var(--space-8);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr));
}

/* Directory and topic pages */
.directory-nav {
  margin-bottom: var(--space-12);
}

.directory-nav ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.directory-nav li {
  min-width: 0;
}

.directory-nav a {
  min-height: 5rem;
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  grid-template-rows: auto auto;
  align-items: center;
  gap: 0 var(--space-3);
  padding: var(--space-4);
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-decoration: none;
}

.directory-nav a > span {
  grid-row: 1 / span 2;
  color: var(--brand-strong);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.directory-nav a > strong {
  line-height: 1.25;
}

.directory-nav a > small {
  color: var(--muted);
  font-size: 0.76rem;
}

.directory-nav a:hover {
  color: var(--on-brand);
  background: var(--brand-strong);
  border-color: var(--brand-strong);
}

.directory-nav a:hover > span,
.directory-nav a:hover > small {
  color: inherit;
}

/* Sticky-header compensation is handled once by html scroll-padding. */
.topic-section {
  scroll-margin-top: 0;
}

.topic-inline-figure {
  margin: 0;
  padding: var(--space-3);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.topic-inline-figure figcaption {
  margin-top: var(--space-3);
  color: var(--muted);
  font-size: 0.8rem;
}

.result-matrix {
  overflow-x: auto;
}

.result-matrix img {
  width: max(60rem, 100%);
  max-width: none;
}

.figure-description {
  margin-top: var(--space-4);
  color: var(--muted);
  font-size: 0.86rem;
}

.figure-description summary {
  width: fit-content;
  color: var(--brand-strong);
  font-weight: 750;
  cursor: pointer;
}

.matrix-data {
  margin: var(--space-3) 0 0;
  padding: var(--space-4);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: var(--code-text);
  background: var(--code-bg);
  border-radius: var(--radius-xs);
  font-size: 0.75rem;
  line-height: 1.6;
}

.status-tag {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  min-height: 1.75rem;
  padding: 0.25rem 0.5rem;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
  text-transform: uppercase;
}

/* Searchable research archive and download desk */
.archive-guide,
.release-shelf,
.catalog-controls {
  border-top: 1px solid var(--line-strong);
}

.catalog-hero .content-lead {
  max-width: 76ch;
}

.resource-legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
  gap: var(--space-3);
  margin: var(--space-8) 0 0;
}

.resource-legend > div {
  min-width: 0;
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--line-strong);
  border-radius: var(--radius-xs);
}

.resource-legend > div[data-resource-kind="release"] {
  border-top-color: var(--brand-strong);
}

.resource-legend > div[data-resource-kind="source"] {
  border-top-color: var(--resource-source);
}

.resource-legend > div[data-resource-kind="dataset"] {
  border-top-color: var(--resource-dataset);
}

.resource-legend > div[data-resource-kind="results"] {
  border-top-color: var(--text);
}

.resource-legend > div[data-resource-kind="notes"] {
  border-top-color: var(--resource-note);
}

.resource-legend dt {
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.resource-legend dd {
  margin: var(--space-2) 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.55;
}

.release-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr));
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.release-item {
  position: relative;
  min-height: 6.25rem;
  display: grid;
  align-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4);
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--brand-strong);
  border-radius: var(--radius-xs);
  text-decoration: none;
  transition: color var(--duration-fast) ease, background var(--duration-fast) ease,
    border-color var(--duration-fast) ease, transform var(--duration-fast) ease;
}

.release-item::after {
  content: "↗";
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  color: var(--brand-strong);
}

.release-item strong {
  padding-right: var(--space-6);
  line-height: 1.35;
}

.release-item small {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.release-item:hover {
  color: var(--on-brand);
  background: var(--brand-strong);
  border-color: var(--brand-strong);
  transform: translateY(-2px);
}

.release-item:hover::after,
.release-item:hover small {
  color: inherit;
}

.section-note {
  max-width: 72ch;
  margin-top: var(--space-6);
  padding-left: var(--space-4);
  color: var(--muted);
  border-left: 3px solid var(--brand);
  font-size: 0.86rem;
}

.catalog-toolbar {
  position: sticky;
  top: 7rem;
  z-index: 8;
  display: grid;
  grid-template-columns: minmax(15rem, 1fr) minmax(0, 1.6fr) auto;
  gap: var(--space-4);
  align-items: end;
  margin-top: var(--space-6);
  padding: var(--space-4);
  background: color-mix(in srgb, var(--surface) 95%, transparent);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  box-shadow: 0 0.75rem 2rem color-mix(in srgb, var(--text) 8%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.catalog-search {
  min-width: 0;
  display: grid;
  gap: var(--space-2);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.035em;
  text-transform: uppercase;
}

.catalog-search input {
  width: 100%;
  min-height: 2.75rem;
  padding: 0.55rem 0.75rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-xs);
  font: 500 0.9rem/1.3 var(--font-sans);
  text-transform: none;
}

.catalog-search input::placeholder {
  color: var(--muted);
  opacity: 0.82;
}

.catalog-filters {
  min-width: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.catalog-filters button {
  min-height: 2.5rem;
  padding: 0.45rem 0.72rem;
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 750;
  cursor: pointer;
}

.catalog-filters button:hover {
  color: var(--text);
  border-color: var(--line-strong);
}

.catalog-filters button[aria-pressed="true"] {
  color: var(--on-brand);
  background: var(--brand-strong);
  border-color: var(--brand-strong);
}

.catalog-count {
  min-width: 6rem;
  margin: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-align: right;
}

.catalog-empty {
  margin-top: var(--space-4);
  padding: var(--space-4);
  color: var(--muted);
  background: var(--surface);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-xs);
}

.catalog-section {
  scroll-margin-top: 0;
}

.catalog-table-wrap {
  border-color: var(--line-strong);
}

.catalog-table {
  width: 100%;
  min-width: 91rem;
  table-layout: fixed;
}

.catalog-table thead th:nth-child(1),
.catalog-table tbody th {
  width: 12rem;
}

.catalog-table thead th:nth-child(2) {
  width: 24rem;
}

.catalog-table thead th:nth-child(3),
.catalog-table thead th:nth-child(4),
.catalog-table thead th:nth-child(5) {
  width: 14rem;
}

.catalog-table thead th:nth-child(6) {
  width: 13rem;
}

.catalog-table tbody th {
  position: sticky;
  left: 0;
  z-index: 2;
  background: var(--surface);
  border-right: 1px solid var(--line-strong);
  font-size: 0.9rem;
  line-height: 1.45;
}

.catalog-table thead th:first-child {
  position: sticky;
  left: 0;
  z-index: 4;
  border-right: 1px solid var(--line-strong);
}

.catalog-table tbody tr:hover > th {
  background: color-mix(in srgb, var(--brand) 7%, var(--surface));
}

.catalog-table td:nth-child(2) > p {
  margin-top: var(--space-2);
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.55;
}

.catalog-table td:nth-child(n + 3) a,
.catalog-table .resource-actions > a,
.catalog-table .resource-actions > button {
  width: fit-content;
  max-width: 100%;
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.45rem;
  border: 1px solid currentColor;
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 750;
  line-height: 1.35;
  text-decoration: none;
}

.catalog-table td:nth-child(3) a {
  color: var(--on-brand);
  background: var(--brand-strong);
  border-color: var(--brand-strong);
}

.catalog-table td:nth-child(4) a {
  color: var(--resource-source);
  background: color-mix(in srgb, var(--resource-source) 7%, transparent);
}

.catalog-table td:nth-child(5) a {
  color: var(--resource-dataset);
  background: color-mix(in srgb, var(--resource-dataset) 7%, transparent);
}

.catalog-table td:nth-child(6) a,
.catalog-table td:nth-child(6) button {
  color: var(--resource-note);
  background: color-mix(in srgb, var(--resource-note) 7%, transparent);
}

.catalog-table td:nth-child(n + 3) a:hover,
.catalog-table td:nth-child(6) button:hover {
  color: var(--on-brand);
  background: var(--brand-strong);
  border-color: var(--brand-strong);
}

.catalog-table .resource-list {
  min-width: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.catalog-table .resource-list > li:not(.resource-item) {
  padding: 0;
}

.resource-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.resource-empty {
  color: var(--muted);
  font-family: var(--font-mono);
  opacity: 0.65;
}

/* Dialogs stay progressively enhanced: content remains in the HTML. */
.rule-popup-trigger {
  appearance: none;
  min-height: 2.35rem;
  padding: 0.45rem 0.7rem;
  color: var(--brand-strong);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-xs);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
}

.rule-popup-trigger:hover {
  border-color: var(--brand);
}

.rule-dialog {
  width: min(44rem, calc(100vw - 2rem));
  max-height: min(48rem, calc(100vh - 2rem));
  padding: 0;
  overflow: auto;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  box-shadow: 0 1.5rem 4rem rgba(0, 0, 0, 0.28);
}

.rule-dialog::backdrop {
  background: var(--dialog-backdrop);
  backdrop-filter: blur(4px);
}

.rule-dialog-card {
  margin: 0;
}

.rule-dialog-head {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.rule-dialog-head h3 {
  margin: 0;
  font-size: 1.25rem;
}

.rule-dialog-close {
  appearance: none;
  width: 2.5rem;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 50%;
  font: inherit;
  font-size: 1.2rem;
  cursor: pointer;
}

.rule-dialog-body {
  padding: var(--space-6);
}

.rule-dialog-body > :last-child {
  margin-bottom: 0;
}

.rule-dialog-figure {
  margin: var(--space-6) 0 0;
}

.rule-dialog-figure img {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.rule-dialog-figure.result-matrix img {
  width: max(52rem, 100%);
  max-width: none;
}

.rule-dialog-figure figcaption {
  margin-top: var(--space-3);
  color: var(--muted);
  font-size: 0.8rem;
}

/* Footer */
.content-footer {
  border-top: 1px solid var(--line-strong);
  background: var(--surface);
}

.footer-inner {
  min-height: 7rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4) var(--space-8);
  padding-block: var(--space-6);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.footer-inner p {
  margin: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-6);
}

.footer-inner a {
  color: var(--text);
}

/* Responsive behavior */
@media (max-width: 64rem) {
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .article-layout {
    grid-template-columns: 11rem minmax(0, 1fr);
    gap: var(--space-12);
  }

  .catalog-toolbar {
    position: static;
    grid-template-columns: 1fr;
    align-items: stretch;
    box-shadow: none;
  }

  .catalog-filters {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding: 0.2rem 0 var(--space-2);
    scrollbar-width: thin;
  }

  .catalog-filters button {
    flex: 0 0 auto;
  }

  .catalog-count {
    text-align: left;
  }

}

@media (max-width: 48rem) {
  .section-heading,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .section-heading {
    gap: var(--space-3);
  }

  .section-heading > p:first-child {
    grid-row: auto;
  }

  .article-toc {
    position: static;
    max-height: none;
    overflow: visible;
    padding: var(--space-6) 0;
    border-bottom: 1px solid var(--line-strong);
  }

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

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

  .catalog-table thead th:nth-child(1),
  .catalog-table tbody th {
    width: 10rem;
  }

  .directory-nav {
    margin-inline: calc(var(--gutter) * -1);
    padding-inline: var(--gutter);
    overflow-x: auto;
    scrollbar-width: thin;
  }

  .directory-nav ol {
    width: max-content;
    display: flex;
  }

  .directory-nav li {
    width: min(14rem, calc(100vw - 3rem));
    flex: 0 0 auto;
  }

  .directory-nav a {
    min-height: 4.25rem;
  }

  .resource-item > a,
  .resource-item > div {
    grid-template-columns: 6rem minmax(0, 1fr);
    gap: var(--space-3);
  }

  .resource-item small {
    grid-column: 2;
  }
}

@media (max-width: 34rem) {
  .content-brand small {
    display: none;
  }

  .content-github {
    min-height: 2.35rem;
    padding-inline: var(--space-3);
  }

  .header-actions {
    gap: var(--space-2);
  }

  .header-inner {
    column-gap: var(--space-2);
  }

  .language-switcher button {
    min-width: 2.2rem;
    min-height: 2rem;
    padding-inline: 0.4rem;
  }

  .content-github span[aria-hidden="true"] {
    display: none;
  }

  .content-hero h1,
  .article-hero h1 {
    font-size: clamp(2.55rem, 14vw, 4.3rem);
  }

  .hero-actions > * {
    width: 100%;
  }

  .article-toc ol {
    grid-template-columns: 1fr;
  }

  .resource-item > a,
  .resource-item > div {
    grid-template-columns: 1fr;
  }

  .resource-item small {
    grid-column: auto;
  }

  .footer-links {
    display: grid;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}