/**
 * ASIOS Website — Base / Prose Styles
 * Assumes tokens.css is loaded first.
 */

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

h1, h2, h3, h4, h5, h6, p {
  margin: 0;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--text);
  background: var(--bg);
}

h1 {
  font-size: var(--font-size-title);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-description {
  font-size: var(--font-size-description);
  color: var(--text-muted);
}

h2 {
  font-size: var(--font-size-h2);
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  margin-top: 48px;
}

h3 {
  font-size: var(--font-size-h3);
  font-weight: 600;
  margin-top: 32px;
}

/* :not(pre) scope keeps this off Shiki's own `pre.shiki code` wrapper
   (R03/blocks.css styles that element itself) — otherwise every highlighted
   line would also pick up this background/padding/radius. */
:not(pre) > code {
  background: var(--code-bg);
  border-radius: var(--radius-inline-code);
  padding: 2px 6px;
  font-size: 0.9em;
  font-family: var(--font-mono);
}

a {
  color: var(--accent-text);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 8px;
  z-index: 100;
  padding: 8px 16px;
  border-radius: var(--radius-button);
  background: var(--accent-on-light);
  color: #fff;
  box-shadow: var(--shadow-card-hover);
  text-decoration: none;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-base) 0;
}

th,
td {
  padding: var(--space-base) calc(var(--space-base) * 2);
  border-bottom: 1px solid var(--border);
  text-align: left;
}

th {
  font-weight: 600;
  background: var(--bg-sidebar);
}

blockquote {
  margin: var(--space-base) 0;
  padding: var(--space-base) calc(var(--space-base) * 2);
  border-left: 4px solid var(--border);
  color: var(--text-muted);
}

blockquote > :first-child {
  margin-top: 0;
}

blockquote > :last-child {
  margin-bottom: 0;
}

ul,
ol {
  margin: var(--space-base) 0;
  padding-left: calc(var(--space-base) * 3);
}

ul ul,
ul ol,
ol ul,
ol ol {
  margin: 0;
  padding-left: calc(var(--space-base) * 3);
}

li + li {
  margin-top: var(--space-base);
}

kbd {
  display: inline-block;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-inline-code);
  padding: 2px 6px;
  font-size: 0.85em;
  font-family: var(--font-mono);
  box-shadow: 0 1px 0 var(--border);
}

sup.footnote-ref {
  font-size: 0.75em;
  color: var(--accent-text);
}

section.footnotes {
  margin-top: calc(var(--space-base) * 3);
  padding-top: var(--space-base);
  border-top: 1px solid var(--border);
  font-size: 0.9em;
}

.footnote-item {
  color: var(--text-muted);
}

.footnote-backref {
  color: var(--accent-text);
  text-decoration: underline;
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
}

.card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-card-hover);
}

.hint {
  border-left: 4px solid;
  padding: 12px 16px;
  border-radius: 4px;
}

.hint-info {
  border-left-color: var(--hint-info);
  background: rgba(59, 130, 246, .08);
}

.hint-success {
  border-left-color: var(--hint-success);
  background: rgba(34, 197, 94, .08);
}

.hint-warning {
  border-left-color: var(--hint-warning);
  background: rgba(245, 158, 11, .08);
}

.hint-danger {
  border-left-color: var(--hint-danger);
  background: rgba(239, 68, 68, .08);
}

.tag {
  display: inline-block;
  background: var(--accent-bg);
  color: var(--accent);
  border-radius: var(--tag-radius);
  font-size: 12px;
  padding: 2px 10px;
}

.button {
  border-radius: var(--radius-button);
  background: var(--accent);
  color: #fff;
  padding: 8px 16px;
  display: inline-block;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

.site-header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.site-header .site-logo {
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.site-header .site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  margin-left: 16px;
}

.drawer-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--text);
}

/* Space variant beside the logo (Header.mjs): a plain title for a single space, a CSS-only
   <details> dropdown for 2+. Auto margins hug it to the logo and push .site-nav right. */
.site-header .space-title,
.site-header .space-switcher {
  margin: 0 auto 0 16px;
  min-width: 0;
}

.site-header .space-title {
  color: var(--text-muted);
  font-size: var(--font-size-sidebar-item);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.space-switcher {
  position: relative;
  font-size: var(--font-size-sidebar-item);
}

.space-switcher summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  color: var(--text-muted);
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: var(--radius-button);
  cursor: pointer;
  list-style: none;
  white-space: nowrap;
}

.space-switcher summary::-webkit-details-marker {
  display: none;
}

.space-switcher summary::after {
  content: '▾';
  font-size: 11px;
}

.space-switcher summary:hover,
.space-switcher[open] summary {
  color: var(--text);
  border-color: var(--accent);
}

.space-switcher ul {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 200px;
  margin: 0;
  padding: 4px;
  list-style: none;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card-hover);
  z-index: 30;
}

.space-switcher li a {
  display: block;
  padding: 6px 10px;
  color: var(--text);
  text-decoration: none;
  border-radius: var(--radius-button);
}

.space-switcher li a:hover {
  background: var(--accent-bg);
}

.space-switcher li a[aria-current="true"] {
  color: var(--accent);
  font-weight: 600;
}

.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .5);
  z-index: 15;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-button);
  cursor: pointer;
  padding: 4px 8px;
}

/* Search (⌘K) — trigger button lives in the header; modal is appended once per page right
   after </header> by Header.mjs. search.js drives all interaction. */
.search-trigger {
  display: flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-button);
  cursor: pointer;
  padding: 4px 8px;
  margin-left: 16px;
  color: var(--text);
}

.search-trigger-hint {
  font-size: 0.75em;
  color: var(--text-muted);
}

.search-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .5);
  z-index: 40;
}

.search-modal {
  position: fixed;
  top: 10vh;
  left: 50%;
  transform: translateX(-50%);
  width: min(600px, 90vw);
  max-height: 70vh;
  display: flex;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card-hover);
  z-index: 41;
}

.search-modal-inner {
  display: flex;
  flex-direction: column;
  min-height: 0;
  width: 100%;
}

.search-input {
  border: none;
  border-bottom: 1px solid var(--border);
  padding: 16px;
  font-size: 1rem;
  color: var(--text);
  background: transparent;
}

.search-input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.search-recent,
.search-results {
  overflow-y: auto;
  padding: 0 16px 16px;
}

.search-recent-label,
.search-result-group-label {
  font-size: 0.75em;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-muted);
  margin: 12px 0 4px;
}

.search-recent-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.search-recent-chip {
  background: var(--accent-bg);
  border: 1px solid var(--border);
  border-radius: var(--tag-radius);
  padding: 4px 10px;
  cursor: pointer;
  color: var(--text);
  font-size: 0.85em;
}

.search-result-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.search-result-item a {
  display: block;
  padding: 8px 10px;
  border-radius: var(--radius-button);
  text-decoration: none;
  color: var(--text);
}

.search-result-title {
  display: block;
  font-weight: 600;
}

.search-result-excerpt {
  display: block;
  font-size: 0.85em;
  color: var(--text-muted);
}

.search-result-item.is-selected a,
.search-result-item a:hover {
  background: var(--accent-bg);
}

.search-no-results {
  color: var(--text-muted);
  padding: 16px;
}

.site-footer {
  padding: 24px;
  text-align: center;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* Docs sidebar — markup/CSS shape matches the User-approved mockup
   (Output/mockups/doc-page.html); sidebar.js click/keyboard island lands in a later chunk. */
.docs-frame {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: calc(100vh - var(--header-height));
}

.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 24px 16px;
  font-size: var(--font-size-sidebar-item);
  overflow-y: auto;
}

.sidebar .group {
  margin-bottom: 4px;
}

.sidebar .group-label {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
}

.sidebar .group-label .chevron {
  transition: transform 150ms ease;
  font-size: 10px;
}

.sidebar .group.open .chevron {
  transform: rotate(90deg);
}

.sidebar ul {
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
}

.sidebar .group:not(.open) > ul {
  display: none;
}

.sidebar a {
  display: block;
  padding: 6px 8px;
  border-radius: var(--radius-inline-code);
  color: var(--text);
  text-decoration: none;
}

.sidebar a:hover {
  background: var(--accent-bg);
  text-decoration: none;
}

.sidebar a.active {
  background: var(--accent-bg);
  color: var(--accent-text);
  font-weight: 600;
  position: relative;
}

.sidebar a.active::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--accent);
}

/* Breadcrumb trail above the page H1 (Breadcrumbs.mjs). Separators are CSS, not markup. */
.breadcrumbs {
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li + li::before {
  content: "›";
  margin-right: 8px;
}

.breadcrumbs a {
  color: var(--text-muted);
  text-decoration: none;
}

.breadcrumbs a:hover {
  text-decoration: underline;
}

/* Previous / next pager under the page body (PageNav.mjs). A lone side still sits on its own edge. */
.page-nav {
  display: flex;
  gap: 16px;
  margin-top: 48px;
}

.page-nav a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 0 1 calc(50% - 8px);
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  color: var(--text);
  text-decoration: none;
}

.page-nav a:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.page-nav-prev {
  align-items: flex-start;
  text-align: left;
}

.page-nav-next {
  align-items: flex-end;
  text-align: right;
  margin-left: auto;
}

.page-nav-label {
  font-size: 13px;
  color: var(--text-muted);
}

.page-nav-title {
  font-weight: 600;
  color: var(--accent-text);
}

/* Page footer under the pager (LastUpdated.mjs + EditLink.mjs): "Last updated <date>" and an
   "Edit this page" link on one muted line, wrapping on narrow screens. */
.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-base) calc(var(--space-base) * 3);
  align-items: baseline;
  justify-content: space-between;
  margin-top: 32px;
  padding-top: calc(var(--space-base) * 2);
  border-top: 1px solid var(--border);
  font-size: var(--font-size-sidebar-item);
  color: var(--text-muted);
}

.page-meta p {
  margin: 0;
}

/* --accent on --bg is 4.48:1 in the dark theme, under AA for 14px text, so the link takes the body
   text colour and keeps the accent as its underline. */
.page-meta a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}

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

/* Page actions under the page heading (PageActions.mjs): Copy as Markdown + Open in Claude/ChatGPT.
   Wraps on narrow screens; the status line (copy fallback message) takes its own row when long.
   Text takes --text, not --accent, for the same dark-theme contrast reason as .page-meta a. */
.page-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-base);
  align-items: center;
  margin: 0 0 calc(var(--space-base) * 2);
  font-size: var(--font-size-sidebar-item);
}

.page-actions [hidden] {
  display: none;
}

.page-actions__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--space-base) / 2) calc(var(--space-base) * 1.5);
  border: 1px solid var(--border);
  border-radius: var(--radius-button);
  background: transparent;
  color: var(--text);
  font: inherit;
  line-height: 1.5;
  text-decoration: none;
  cursor: pointer;
}

.page-actions__btn:hover {
  background: var(--accent-bg);
  border-color: var(--accent);
}

.page-actions__btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.page-actions__btn.is-copied {
  border-color: var(--hint-success);
}

.page-actions__status {
  color: var(--text-muted);
}

.page-actions__status:empty {
  display: none;
}

.page-actions__status a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}

/* Docs "Was this page helpful?" widget (Feedback.mjs) at the end of the article. Buttons match
   .page-actions__btn; the status line is an aria-live region that takes no space while empty.
   Text takes --text, not --accent, for the same dark-theme contrast reason as .page-meta a. */
.feedback {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-base) calc(var(--space-base) * 2);
  align-items: center;
  margin: calc(var(--space-base) * 5) 0 calc(var(--space-base) * 3);
  padding-top: calc(var(--space-base) * 3);
  border-top: 1px solid var(--border);
  font-size: var(--font-size-sidebar-item);
}

.feedback__question {
  color: var(--text);
  font-weight: 600;
}

.feedback__actions {
  display: flex;
  gap: var(--space-base);
}

.feedback__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: calc(var(--space-base) * 7);
  padding: calc(var(--space-base) / 2) calc(var(--space-base) * 1.5);
  border: 1px solid var(--border);
  border-radius: var(--radius-button);
  background: transparent;
  color: var(--text);
  font: inherit;
  line-height: 1.5;
  cursor: pointer;
}

.feedback__btn:hover:not([aria-disabled="true"]) {
  background: var(--accent-bg);
  border-color: var(--accent);
}

.feedback__btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.feedback__btn[aria-disabled="true"] {
  cursor: default;
  color: var(--text-muted);
}

.feedback__btn[aria-pressed="true"] {
  border-color: var(--hint-success);
  color: var(--text);
}

.feedback__status {
  color: var(--text-muted);
}

/* Empty, the live region is clipped to nothing but stays in the accessibility tree: a region that goes
   display:none -> visible together with its text is announced unreliably, so it must exist beforehand. */
.feedback__status:empty {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.feedback__status.is-error {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--hint-danger);
  text-underline-offset: 3px;
}

/* Shared 404 page (NotFound.mjs) — centred empty-state body between the site header and footer. */
.not-found {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-base);
  min-height: 50vh;
  padding: calc(var(--space-base) * 6) var(--space-base);
  text-align: center;
}

.not-found__body {
  margin: 0;
  max-width: 40ch;
  color: var(--text-muted);
}

.not-found__home {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: var(--space-base);
  padding: calc(var(--space-base) / 2) calc(var(--space-base) * 1.5);
  border: 1px solid var(--border);
  border-radius: var(--radius-button);
  color: var(--text);
  text-decoration: none;
}

.not-found__home:hover {
  background: var(--accent-bg);
  border-color: var(--accent);
}

.not-found__home:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 768px) {
  .docs-frame {
    grid-template-columns: 1fr;
  }

  .drawer-toggle {
    display: inline-flex;
    align-items: center;
  }

  /* Marketing/blog top nav (Home/Pricing/About/Blog) has no drawer of its own at this width —
     hide it rather than wrap, and drop the ⌘K hint so the search trigger shrinks to icon-only. */
  .site-header .site-nav {
    display: none;
  }

  .search-trigger-hint {
    display: none;
  }

  /* Keep the space label from colliding with the drawer toggle: it shrinks and ellipsizes, and
     the header's top-level nav links yield to it. */
  .site-header .space-title,
  .site-header .space-switcher {
    margin-left: 8px;
    max-width: 40vw;
  }

  .site-header .space-switcher summary {
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: min(80vw, 320px);
    z-index: 20;
    box-shadow: var(--shadow-card-hover);
    transform: translateX(-100%);
    transition: transform 200ms ease;
  }

  .sidebar.drawer-open {
    transform: translateX(0);
  }

  .page-nav {
    flex-direction: column;
  }

  .page-nav a {
    flex-basis: auto;
  }

  .page-nav-next {
    margin-left: 0;
  }
}

/* "On this page" table of contents (Toc.mjs). One list, two renders: a sticky right-hand rail
   (`.toc`, third `.docs-frame` column, only when the page has a Toc) at >= 1024px, and a
   `<details class="toc-dropdown">` at the top of the article below that. Placed after the 768px
   block above on purpose: `.docs-frame.has-toc` outranks `.docs-frame` there, so the one-column
   collapse is restated for it at the end of this section. */
.docs-frame.has-toc {
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr) var(--toc-width);
}

.docs-content h2,
.docs-content h3 {
  scroll-margin-top: calc(var(--header-height) + 16px);
}

.toc {
  position: sticky;
  top: var(--header-height);
  align-self: start;
  max-height: calc(100vh - var(--header-height));
  overflow-y: auto;
  padding: 24px 16px 24px 8px;
  font-size: var(--font-size-toc-item);
}

.toc-title {
  margin: 0 0 8px;
  padding: 0 8px;
  font-weight: 600;
  color: var(--text-muted);
}

.toc ol,
.toc-dropdown ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc ol ol,
.toc-dropdown ol ol {
  padding-left: 14px;
}

.toc a,
.toc-dropdown a {
  display: block;
  padding: 4px 8px;
  border-radius: var(--radius-inline-code);
  color: var(--text-muted);
  text-decoration: none;
  overflow-wrap: anywhere;
}

.toc a:hover,
.toc-dropdown a:hover {
  background: var(--accent-bg);
  color: var(--accent);
  text-decoration: none;
}

/* Scroll-spy state (toc.js): the link of the heading currently in view. An inset bar rather than
   a weight change, so the active row never reflows the list. */
.toc .active,
.toc-dropdown .active {
  background: var(--accent-bg);
  color: var(--accent-text);
  box-shadow: inset 2px 0 0 var(--accent);
}

.toc-dropdown {
  display: none;
  margin: 0 0 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  font-size: var(--font-size-toc-item);
}

.toc-dropdown summary {
  padding: 10px 14px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
}

.toc-dropdown ol {
  padding: 0 8px 10px;
}

@media (max-width: 1023px) {
  .docs-frame.has-toc {
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  }

  .toc {
    display: none;
  }

  .toc-dropdown {
    display: block;
  }
}

@media (max-width: 768px) {
  .docs-frame.has-toc {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Blog post frame (Phase 5.3) — content + the SAME Toc rail/dropdown pair docs pages use
   (`.toc`/`.toc-dropdown`, reused via `docs/Toc.mjs`), just without the sidebar column: blog posts
   carry no nav tree, so this is its own two-column grid rather than reusing `.docs-frame`, whose
   `sidebar-width` column would otherwise swallow `<main>` with no `<aside>` to fill it. */
.blog-frame {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 24px;
}

.blog-frame.has-toc {
  grid-template-columns: minmax(0, 1fr) var(--toc-width);
  gap: calc(var(--space-base) * 3);
  max-width: calc(var(--content-max-width) + var(--toc-width) + var(--space-base) * 3);
}

.blog-frame article h2,
.blog-frame article h3 {
  scroll-margin-top: calc(var(--header-height) + 16px);
}

@media (max-width: 1023px) {
  .blog-frame.has-toc {
    grid-template-columns: minmax(0, 1fr);
    max-width: var(--content-max-width);
  }
}

/* Related posts (RelatedPosts.mjs), after the article — tag-overlap picks only, so an untagged
   post (or one sharing no tag with any sibling) gets no section at all. */
.related-posts {
  margin-top: calc(var(--space-base) * 5);
  padding-top: calc(var(--space-base) * 3);
  border-top: 1px solid var(--border);
}

.related-posts h2 {
  margin-top: 0;
  border-bottom: none;
}

.related-posts ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* --accent on --bg is 4.48:1 in the dark theme, under AA for normal text, so the link takes the
   body text colour and keeps the accent as its underline — same fix as .page-meta a. */
.related-posts a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}

/* Blog listing tag filter (BlogLayout.mjs's renderTagFilter + tag-filter.js), main /blog/ page
   only — toggle buttons filter `.post-list` client-side and sync the selection into the URL query
   string. Buttons are a working (if inert) list before the script runs. */
.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-base);
  align-items: center;
  margin: 0 0 calc(var(--space-base) * 2);
}

.tag-filter__label {
  font-size: var(--font-size-sidebar-item);
  color: var(--text-muted);
}

.tag-filter__controls {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space-base) / 2);
}

.tag-filter__btn {
  padding: calc(var(--space-base) / 2) calc(var(--space-base) * 1.5);
  border: 1px solid var(--border);
  border-radius: var(--radius-button);
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: var(--font-size-sidebar-item);
  line-height: 1.5;
  cursor: pointer;
}

.tag-filter__btn:hover {
  background: var(--accent-bg);
  border-color: var(--accent);
}

.tag-filter__btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.tag-filter__btn[aria-pressed="true"] {
  background: var(--accent-bg);
  border-color: var(--accent);
  font-weight: 600;
}

.tag-filter__empty {
  color: var(--text-muted);
  font-size: var(--font-size-sidebar-item);
}

.tag-filter__empty[hidden] {
  display: none;
}