:root {
  color-scheme: light dark;
  --color-background: #f5f1e8;
  --color-surface: #fffdf8;
  --color-text: #20221f;
  --color-text-muted: #62665e;
  --color-border: #d7d2c7;
  --color-link: #1e5d68;
  --color-link-strong: #164750;
  --color-focus: #bb5d2a;
  --shadow-soft: 0 1rem 3rem rgb(32 34 31 / 8%);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root[data-theme="light"] {
  color-scheme: light;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --color-background: #1b201e;
  --color-surface: #252c29;
  --color-text: #f1eee5;
  --color-text-muted: #c2c8be;
  --color-border: #45514b;
  --color-link: #9ed5d2;
  --color-link-strong: #c1e7df;
  --color-focus: #f2aa75;
  --shadow-soft: 0 1rem 3rem rgb(0 0 0 / 24%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-background: #1b201e;
    --color-surface: #252c29;
    --color-text: #f1eee5;
    --color-text-muted: #c2c8be;
    --color-border: #45514b;
    --color-link: #9ed5d2;
    --color-link-strong: #c1e7df;
    --color-focus: #f2aa75;
    --shadow-soft: 0 1rem 3rem rgb(0 0 0 / 24%);
  }
}

* {
  box-sizing: border-box;
}

html {
  background: var(--color-background);
  color: var(--color-text);
}

body {
  margin: 0;
  min-width: 18rem;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--color-background);
  color: var(--color-text);
  line-height: 1.75;
}

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 0.2rem solid var(--color-focus);
  outline-offset: 0.2rem;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 1rem;
  padding: 0.5rem 0.75rem;
  background: var(--color-surface);
  color: var(--color-text);
  transform: translateY(-200%);
  z-index: 1;
}

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

.site-header,
.site-footer {
  width: calc(100% - 2rem);
  max-width: 70rem;
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  text-decoration: none;
  line-height: 1.2;
}

.brand__name {
  color: var(--color-text);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.brand__ja {
  color: var(--color-text-muted);
  font-size: 0.75rem;
}

.theme-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.7rem;
  border: 0;
  margin: 0;
  padding: 0;
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.theme-switcher legend {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.theme-switcher label {
  white-space: nowrap;
}

.theme-switcher input {
  accent-color: var(--color-link);
}

.landing {
  width: calc(100% - 2rem);
  max-width: 52rem;
  min-width: 0;
  margin: auto;
  padding: 4rem 0 5rem;
}

.landing--compact {
  display: grid;
  align-content: center;
  padding-block: 3rem;
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--color-link);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
p {
  max-width: 42rem;
}

h1 {
  margin: 0;
  max-width: 34rem;
  font-size: clamp(2rem, 6vw, 4.4rem);
  line-height: 1.15;
  letter-spacing: -0.04em;
}

h2 {
  margin: 0;
  font-size: 1.2rem;
  line-height: 1.4;
}

.lead {
  margin: 1.5rem 0 0;
  color: var(--color-text-muted);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
}

.today-why {
  max-width: 44rem;
  margin-top: 2.25rem;
  padding: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.today-why .eyebrow {
  margin-bottom: 0.25rem;
}

.today-why h2 {
  margin-bottom: 0.9rem;
}

.today-why__link {
  display: block;
  padding: 1rem;
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  color: var(--color-text);
  text-decoration: none;
  transition: border-color 150ms ease, transform 150ms ease;
}

.today-why__link:hover {
  border-color: var(--color-link);
  transform: translateY(-0.1rem);
}

.today-why__date,
.today-why__category,
.today-why__title,
.today-why__description,
.today-why__cta {
  display: block;
}

.today-why__date,
.today-why__category {
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.today-why__category {
  margin-top: 0.25rem;
  letter-spacing: 0.08em;
}

.today-why__title {
  margin-top: 0.35rem;
  color: var(--color-link-strong);
  font-size: clamp(1.2rem, 3vw, 1.65rem);
  font-weight: 750;
  line-height: 1.4;
}

.today-why__description {
  margin-top: 0.5rem;
  color: var(--color-text-muted);
}

.today-why__cta {
  margin-top: 0.8rem;
  color: var(--color-link);
  font-weight: 750;
}

.language-choice {
  max-width: 44rem;
  margin-top: 4rem;
}

.language-choice__links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.language-card {
  display: flex;
  min-height: 9rem;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
  color: var(--color-text);
  text-decoration: none;
  transition: border-color 150ms ease, transform 150ms ease;
}

.language-card:hover {
  border-color: var(--color-link);
  transform: translateY(-0.15rem);
}

.article-catalog {
  margin-top: 3rem;
}

.article-catalog h2 {
  margin-bottom: 1rem;
}

.article-catalog__toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  max-width: 44rem;
  margin-bottom: 1rem;
}

.article-pagination-status {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.article-catalog__list {
  display: grid;
  gap: 0.75rem;
  max-width: 44rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.article-catalog__item a {
  display: block;
  padding: 0.85rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  background: var(--color-surface);
  text-decoration: none;
}

.article-catalog__item a:hover {
  border-color: var(--color-link);
}

.article-catalog__item.is-read a {
  opacity: 0.7;
}

.article-catalog__read-state {
  display: inline;
  margin-right: 0.45rem;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 700;
}

.article-catalog__read-state:empty {
  display: none;
}

.article-catalog__category {
  display: block;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.article-pagination {
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  justify-content: safe center;
  align-items: center;
  gap: 0.45rem;
  max-width: 44rem;
  margin-top: 1.25rem;
  overflow-x: auto;
  padding: 0.1rem 0.1rem 0.35rem;
  scrollbar-width: thin;
}

.article-pagination a,
.article-pagination span,
.category-pagination a,
.category-pagination span {
  flex: 0 0 auto;
  min-width: 2.2rem;
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--color-border);
  border-radius: 0.4rem;
  text-align: center;
  text-decoration: none;
}

.article-pagination span,
.category-pagination span {
  border-color: transparent;
}

.article-pagination a[aria-current="page"] {
  border-color: var(--color-link);
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: 750;
}

.category-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  margin-top: 2rem;
}

.category-nav a[aria-current="page"] {
  color: var(--color-text);
  font-weight: 750;
  text-decoration-thickness: 0.15em;
}

.article-search {
  display: grid;
  grid-template-columns: minmax(8rem, 1fr) auto;
  gap: 0.4rem;
  width: min(100%, 22rem);
  margin-top: 0.5rem;
}

.article-search label {
  grid-column: 1 / -1;
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.article-search input,
.article-search button {
  min-height: 2.25rem;
  border: 1px solid var(--color-border);
  border-radius: 0.4rem;
  background: var(--color-surface);
  color: var(--color-text);
  font: inherit;
}

.article-search input {
  min-width: 0;
  padding: 0.35rem 0.55rem;
}

.article-search button {
  padding: 0.35rem 0.8rem;
  cursor: pointer;
}

.article-search button:hover {
  border-color: var(--color-link);
}

.search-status {
  margin: 0.75rem 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.55rem;
  margin-bottom: 1.5rem;
  color: var(--color-text-muted);
  font-size: 0.82rem;
}

.breadcrumbs a {
  color: var(--color-link);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin: 2rem 0 0;
}

.reading-toggle {
  min-height: 2.25rem;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 0.45rem;
  background: var(--color-surface);
  color: var(--color-text);
  font: inherit;
  cursor: pointer;
}

.reading-toggle:hover,
.reading-toggle.is-read {
  border-color: var(--color-link);
}

.category-pagination {
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  justify-content: safe center;
  gap: 0.45rem;
  margin-top: 2rem;
  overflow-x: auto;
  padding: 0.1rem 0.1rem 0.35rem;
  scrollbar-width: thin;
}

.category-pagination a {
  min-width: 2.2rem;
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--color-border);
  border-radius: 0.4rem;
  text-align: center;
  text-decoration: none;
}

.category-pagination a[aria-current="page"] {
  border-color: var(--color-link);
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: 750;
}

.knowledge-maze {
  margin-top: 3rem;
  padding: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  background: var(--color-surface);
}

.knowledge-maze .eyebrow {
  margin-bottom: 0.25rem;
}

.knowledge-maze h2 {
  margin: 0 0 0.75rem;
  border: 0;
  padding: 0;
}

.knowledge-maze ul {
  margin: 0;
  padding-left: 1.25rem;
}

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

.language-card__label {
  font-size: 1.15rem;
  font-weight: 750;
}

.language-card__description {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.text-link {
  font-weight: 700;
}

.article-tools {
  display: grid;
  justify-items: end;
  gap: 0.4rem;
}

.language-switch {
  display: flex;
  gap: 0.75rem;
  font-size: 0.85rem;
}

.article-layout {
  width: calc(100% - 2rem);
  max-width: 42rem;
  min-width: 0;
  margin: 0 auto;
  padding: 3rem 0 5rem;
}

.article {
  min-width: 0;
}

.article__content h1 {
  max-width: none;
  margin: 0 0 2rem;
  font-size: clamp(2rem, 5vw, 3.5rem);
}

.article__content h2 {
  margin: 3rem 0 1rem;
  padding-top: 0.25rem;
  border-top: 1px solid var(--color-border);
  font-size: clamp(1.35rem, 3vw, 1.8rem);
}

.article__content h3 {
  margin: 2rem 0 0.75rem;
  font-size: 1.2rem;
}

.article__content p,
.article__content ul {
  max-width: 44rem;
  margin: 1rem 0;
}

.article__content p:first-of-type {
  color: var(--color-text-muted);
  font-size: 1.1rem;
}

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

.article__content code {
  padding: 0.1em 0.3em;
  border-radius: 0.25rem;
  background: color-mix(in srgb, var(--color-border) 45%, transparent);
  font-size: 0.95em;
}

.article__content pre {
  max-width: 44rem;
  margin: 1.25rem 0;
  overflow-x: auto;
  padding: 1rem 1.1rem;
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  background: var(--color-surface);
  color: var(--color-text);
  font: 0.95rem/1.65 ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  tab-size: 2;
}

.article__content pre code {
  padding: 0;
  background: transparent;
  font: inherit;
}

.article__content blockquote {
  max-width: 44rem;
  margin: 1.5rem 0;
  padding: 0.9rem 1.1rem;
  border-left: 0.25rem solid var(--color-link);
  background: var(--color-surface);
  color: var(--color-text-muted);
}

.article__content blockquote p {
  margin: 0;
}

.article__content table {
  width: 100%;
  max-width: 44rem;
  margin: 1.25rem 0;
  border-collapse: collapse;
  background: var(--color-surface);
  font-size: 0.95rem;
}

.article__content .table-scroll {
  width: 100%;
  max-width: 44rem;
  margin: 1.25rem 0;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: 0.65rem;
  background: var(--color-surface);
  scrollbar-color: var(--color-border) transparent;
}

.article__content .table-scroll table {
  min-width: 38rem;
  margin: 0;
}

.article__content .fact-table-scroll {
  max-width: 44rem;
}

.article__content .fact-table {
  min-width: 54rem;
  max-width: none;
  table-layout: fixed;
}

.article__content .fact-table th,
.article__content .fact-table td {
  line-height: 1.55;
}

.article__content .fact-table th:first-child,
.article__content .fact-table td:first-child {
  width: auto;
}

.article__content .fact-table th:nth-child(1),
.article__content .fact-table td:nth-child(1) {
  width: 7rem;
}

.article__content .fact-table th:nth-child(2),
.article__content .fact-table td:nth-child(2) {
  width: 27%;
}

.article__content .fact-table th:nth-child(3),
.article__content .fact-table td:nth-child(3) {
  width: 23%;
}

.article__content .fact-table th:nth-child(4),
.article__content .fact-table td:nth-child(4) {
  width: 7rem;
}

.article__content .fact-table th:nth-child(5),
.article__content .fact-table td:nth-child(5) {
  width: 23%;
}

.fact-type,
.fact-status {
  display: inline-block;
  white-space: nowrap;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.fact-type--spec,
.fact-status--reviewed {
  color: var(--color-link);
}

.fact-type--impl,
.fact-type--wpt,
.fact-type--aam,
.fact-status--pending {
  color: var(--color-focus);
}

.fact-type--unresolved,
.fact-status--open {
  color: var(--color-focus);
}

.fact-table a {
  overflow-wrap: anywhere;
}

.article__content .table-scroll:focus-visible {
  outline: 0.2rem solid var(--color-focus);
  outline-offset: 0.2rem;
}

.article__content caption {
  padding: 0.7rem 0.75rem;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 700;
  text-align: left;
}

.article__content th,
.article__content td {
  padding: 0.7rem 0.75rem;
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.article__content th {
  color: var(--color-text);
  font-weight: 750;
}

.article__content td:first-child,
.article__content th:first-child {
  width: 28%;
}

.article__content .callout {
  max-width: 44rem;
  margin: 1.5rem 0;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.article__content .callout--important {
  border-left: 0.35rem solid var(--color-link);
}

.article__content .example-box {
  max-width: 44rem;
  margin: 1.25rem 0;
  padding: 1rem 1.1rem;
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  background: var(--color-surface);
}

.article__content .example-box > :first-child {
  margin-top: 0;
}

.article__content .example-box > :last-child {
  margin-bottom: 0;
}

.article__content .embedded-example {
  display: block;
  width: 100%;
  min-height: 10rem;
  margin: 1rem 0 0;
  border: 1px solid var(--color-border);
  border-radius: 0.45rem;
  background: var(--color-background);
}

.article__content details {
  max-width: 44rem;
  margin: 1.25rem 0;
  padding: 0.9rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  background: var(--color-surface);
}

.article__content details + details {
  margin-top: 0.75rem;
}

.article__content summary {
  color: var(--color-text);
  font-weight: 750;
  cursor: pointer;
}

.article__content summary::marker {
  color: var(--color-link);
}

.article__content summary:focus-visible {
  outline: 0.2rem solid var(--color-focus);
  outline-offset: 0.2rem;
}

.article__content details[open] > summary {
  margin-bottom: 0.8rem;
}

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

.article__content .example-form {
  display: grid;
  gap: 0.85rem;
  max-width: 28rem;
}

.article__content .example-form label {
  display: grid;
  gap: 0.3rem;
  color: var(--color-text);
  font-weight: 700;
}

.article__content .example-form input:not([type="checkbox"]):not([type="radio"]),
.article__content .example-form textarea,
.article__content .example-form button {
  min-height: 2.5rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--color-border);
  border-radius: 0.4rem;
  background: var(--color-background);
  color: var(--color-text);
  font: inherit;
}

.article__content .example-form textarea {
  min-height: 8rem;
  line-height: 1.6;
  resize: vertical;
}

.article__content .example-form input:not([type="checkbox"]):not([type="radio"]):focus-visible,
.article__content .example-form textarea:focus-visible,
.article__content .example-form button:focus-visible {
  outline: 0.2rem solid var(--color-focus);
  outline-offset: 0.2rem;
}

.article__content .example-form button {
  width: fit-content;
  padding-inline: 0.9rem;
  cursor: pointer;
}

.article__content .example-form button:hover {
  border-color: var(--color-link);
}

.article__content .choice-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1rem;
  margin: 0;
  padding: 0;
  border: 0;
}

.article__content .choice-group label {
  display: inline-flex;
  grid-template-columns: none;
  align-items: center;
  gap: 0.4rem;
  font-weight: 400;
}

.article__content .callout p:last-child,
.article__content .callout ul:last-child {
  margin-bottom: 0;
}

.surface-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.85rem;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.surface-nav a[aria-current="page"] {
  color: var(--color-text);
  font-weight: 750;
  text-decoration-thickness: 0.15em;
}

.topic-status {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  max-width: 44rem;
  margin: 0 0 1.5rem;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.topic-status strong {
  color: var(--color-text);
}

.evidence-list {
  max-width: 44rem;
  padding-left: 1.25rem;
}

.evidence-list li + li {
  margin-top: 0.65rem;
}

.coverage-list {
  display: grid;
  gap: 0.65rem;
  max-width: 44rem;
  margin: 1rem 0;
  padding: 0;
  list-style: none;
}

.coverage-list li {
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: 0.55rem;
  background: var(--color-surface);
}

.coverage-list .coverage-label {
  display: inline-block;
  min-width: 4.5rem;
  margin-right: 0.5rem;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.coverage-list .coverage-pass .coverage-label {
  color: var(--color-link);
}

.coverage-list .coverage-open .coverage-label {
  color: var(--color-focus);
}

.evidence-model-list {
  display: grid;
  gap: 0.55rem;
  max-width: 44rem;
  margin: 1rem 0;
  padding: 0;
  list-style: none;
}

.evidence-model-list li {
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  background: var(--color-surface);
}

.evidence-model-note,
.implementation-evidence-note {
  max-width: 44rem;
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

.implementation-evidence-table th:first-child,
.implementation-evidence-table td:first-child {
  width: 7rem;
}

.implementation-evidence-table th:nth-child(2),
.implementation-evidence-table td:nth-child(2) {
  width: 30%;
}

.implementation-evidence-table th:nth-child(3),
.implementation-evidence-table td:nth-child(3) {
  width: 34%;
}

.implementation-evidence-table th:nth-child(4),
.implementation-evidence-table td:nth-child(4) {
  width: 7rem;
}

.article__content a {
  text-decoration-thickness: 0.1em;
  text-underline-offset: 0.16em;
}

@media (max-width: 42rem) {
  .article-tools {
    justify-items: start;
  }

  .article-layout {
    padding-top: 2rem;
  }
}

.site-footer {
  padding: 1.5rem 0 2rem;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 42rem) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .language-choice__links {
    grid-template-columns: 1fr;
  }

  .landing {
    padding-top: 3rem;
  }
}

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