/*
 * docs-chrome.css - header, tab bar, drawer, previous/next cards and footer of both doc sites.
 * Purpose: the docs frame looks like the landing frame (same brand, same pill buttons, same footer) and always offers a way back to it.
 * Markup: docs-theme/partials/header.html, nav.html (drawer block), tabs-item.html, footer.html. Page content styling lives in docs.css.
 * Invariants: tokens only (no raw colours or durations); Material's rem is 20px, so sizes are px or rem on purpose; focus ring is the
 * token ring; motion is off under prefers-reduced-motion; targets are at least 40px (24px minimum, WCAG 2.5.8).
 */
:root {
  --bb-docs-gutter: var(--bb-space-4);
  --bb-docs-control: 40px;
  scroll-padding-top: calc(var(--bb-nav-height) + var(--bb-space-4));
}

/* ---------- Internal-only line (internal site) ---------- */
.bb-docs-internal {
  margin: 0;
  padding: var(--bb-space-1) var(--bb-space-4);
  text-align: center;
  font-size: 0.65rem;
  color: var(--bb-color-text);
  background-color: var(--bb-color-surface-2);
  border-bottom: 1px solid var(--bb-color-border);
}

/* ---------- Header ---------- */
.bb-docs-header {
  background-color: color-mix(in srgb, var(--bb-color-bg) 88%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  color: var(--bb-color-text);
  box-shadow: none;
  border-bottom: 1px solid var(--bb-color-border);
}
.bb-docs-header .md-header__inner {
  min-height: var(--bb-nav-height);
  gap: var(--bb-space-3);
  padding-inline: var(--bb-docs-gutter);
}
.bb-docs-brand {
  flex-shrink: 0;
  min-height: var(--bb-docs-control);
  border-radius: var(--bb-radius-md);
}
.bb-docs-brand .bb-brand__mark img {
  display: block;
  width: 100%;
  height: 100%;
}
.bb-docs-brand:hover .bb-brand__name {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}
.bb-docs-badge {
  flex-shrink: 0;
  padding: 2px var(--bb-space-3);
  border: 1px solid var(--bb-color-border);
  border-radius: var(--bb-radius-pill);
  background-color: var(--bb-color-surface-2);
  color: var(--bb-color-text);
  font-size: 0.65rem;
  font-weight: var(--bb-font-weight-medium);
  line-height: 1.6;
}
@media (max-width: 29.9375em) {
  .bb-docs-badge {
    display: none;
  }
}
/* Material's page-title swap is replaced by the brand; kept in the DOM because Material's script looks for it. */
.bb-docs-header .md-header__title {
  display: none;
}

/* Site links: pills like the landing nav. Hidden below 1220px, where the drawer carries the same links. */
.bb-docs-site.bb-pill-nav {
  display: none;
  position: static;
  min-height: 0;
  padding: 0;
  margin-inline-start: var(--bb-space-3);
  background: transparent;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  border: 0;
  gap: var(--bb-space-1);
  font-size: 0.7rem;
}
.bb-docs-site.bb-pill-nav a:not(.bb-btn) {
  min-height: 36px;
  padding-block: 0;
  gap: var(--bb-space-2);
  color: var(--bb-color-text-muted);
  font-weight: var(--bb-font-weight-medium);
  white-space: nowrap;
}
.bb-docs-site.bb-pill-nav a:not(.bb-btn):hover {
  color: var(--bb-color-text);
}
.bb-docs-site.bb-pill-nav a[aria-current] {
  color: var(--bb-color-text);
}
.bb-docs-site.bb-pill-nav a.bb-docs-back {
  color: var(--bb-color-text);
  border: 1px solid var(--bb-color-border);
}
.bb-docs-back svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  transition: transform var(--bb-motion-duration-base) var(--bb-motion-ease-standard);
}
.bb-docs-back:hover svg {
  transform: translateX(-3px);
}
@media (min-width: 76.25em) {
  .bb-docs-site.bb-pill-nav {
    display: flex;
  }
}

/* Right side: search, theme toggle, account buttons. */
.bb-docs-end {
  display: flex;
  align-items: center;
  gap: var(--bb-space-2);
  margin-inline-start: auto;
}
.bb-docs-header .md-header__button.md-icon {
  display: inline-grid;
  place-items: center;
  width: var(--bb-docs-control);
  height: var(--bb-docs-control);
  margin: 0;
  padding: 0;
  border: 1px solid var(--bb-color-border);
  border-radius: var(--bb-radius-pill);
  color: var(--bb-color-text);
  background: transparent;
  transition: background-color var(--bb-motion-duration-fast) var(--bb-motion-ease-standard);
}
.bb-docs-header .md-header__button.md-icon:hover {
  background-color: var(--bb-color-surface-2);
}
.bb-docs-header .md-header__button.md-icon svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}
.bb-docs-header .md-header__option {
  margin: 0;
  max-width: none;
  opacity: 1;
}
.bb-docs-header .md-header__button.md-icon[hidden] {
  display: none;
}
.bb-docs-header .bb-docs-menu {
  margin-inline-end: var(--bb-space-1);
}
@media (min-width: 76.25em) {
  .bb-docs-header .md-header__button.bb-docs-menu {
    display: none;
  }
}
.bb-docs-actions {
  display: none;
  align-items: center;
  gap: var(--bb-space-2);
  margin-inline-start: var(--bb-space-2);
}
.bb-docs-actions .bb-btn {
  min-height: var(--bb-docs-control);
  font-size: 0.7rem;
  text-decoration: none;
  white-space: nowrap;
}
@media (min-width: 48em) {
  .bb-docs-actions {
    display: inline-flex;
  }
}
/* Between the drawer and the full pill nav there is less room: the ghost link folds into the footer and drawer. */
@media (min-width: 48em) and (max-width: 87.5em) {
  .bb-docs-actions .bb-btn--ghost {
    display: none;
  }
}

/* Search: a pill field on the surface colour; below 960px it is Material's icon plus overlay. */
.bb-docs-header .md-search__form {
  height: var(--bb-docs-control);
  border-radius: var(--bb-radius-pill);
  background-color: var(--bb-color-surface-2);
  border: 1px solid var(--bb-color-border);
  box-shadow: none;
}
.bb-docs-header .md-search__input {
  height: 100%;
  background: transparent;
  color: var(--bb-color-text);
  font-size: 0.7rem;
}
.bb-docs-header .md-search__input::placeholder,
.bb-docs-header .md-search__icon {
  color: var(--bb-color-text-muted);
}
.bb-docs-header .md-search__input:focus-visible {
  outline: none;
}
.bb-docs-header .md-search__form:focus-within {
  outline: 3px solid var(--bb-color-focus);
  outline-offset: 2px;
}
.bb-docs-header [data-md-toggle="search"]:checked ~ .md-header__inner .md-search__form,
[data-md-toggle="search"]:checked ~ .md-header .md-search__form {
  border-radius: var(--bb-radius-lg) var(--bb-radius-lg) 0 0;
}
@media (min-width: 60em) {
  .bb-docs-header .md-header__button[for="__search"] {
    display: none;
  }
  .bb-docs-header .md-search__inner {
    width: 14rem;
    padding: 0;
  }
}
@media (min-width: 76.25em) {
  .bb-docs-header .md-search__inner {
    width: 11rem;
  }
}
@media (min-width: 87.5em) {
  .bb-docs-header .md-search__inner {
    width: 14rem;
  }
}

/* Focus: every control in the frame uses the token ring. */
.bb-docs-header a:focus-visible,
.bb-docs-header label:focus-visible,
.bb-docs-header button:focus-visible,
.md-tabs a:focus-visible,
.md-footer a:focus-visible,
.bb-docs-drawer a:focus-visible {
  outline: 3px solid var(--bb-color-focus);
  outline-offset: 2px;
}
.md-header__option:focus-within .md-header__button {
  outline: 3px solid var(--bb-color-focus);
  outline-offset: 2px;
}

/* Sidebars sit under the 64px header (Material assumes a 48px one). */
@media (min-width: 76.25em) {
  .md-sidebar {
    top: var(--bb-nav-height);
  }
}

/* ---------- Tab bar ---------- */
.md-tabs {
  background-color: var(--bb-color-surface);
  color: var(--bb-color-text);
  border-bottom: 1px solid var(--bb-color-border);
}
.md-tabs__list {
  display: flex;
  gap: var(--bb-space-1);
  padding-inline: calc(var(--bb-docs-gutter) - var(--bb-space-3));
  contain: none;
}
.md-tabs__item {
  height: auto;
  padding: 0;
}
.md-tabs__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  margin: 0;
  padding: 0 var(--bb-space-3);
  min-height: 46px;
  color: var(--bb-color-text-muted);
  font-size: 0.7rem;
  font-weight: var(--bb-font-weight-medium);
  opacity: 1;
  transition: color var(--bb-motion-duration-fast) var(--bb-motion-ease-standard);
}
.md-tabs__link::before {
  content: "";
  position: absolute;
  inset: var(--bb-space-2) 0;
  z-index: -1;
  border-radius: var(--bb-radius-md);
  background-color: transparent;
  transition: background-color var(--bb-motion-duration-fast) var(--bb-motion-ease-standard);
}
.md-tabs__link:hover {
  color: var(--bb-color-text);
}
.md-tabs__link:hover::before {
  background-color: var(--bb-color-hover);
}
/* Active tab: stronger text and a 2px indicator sitting on the bar's own hairline. */
.md-tabs__link::after {
  content: "";
  position: absolute;
  inset: auto var(--bb-space-3) -1px;
  height: 2px;
  border-radius: 2px 2px 0 0;
  background-color: var(--bb-color-link);
  transform: scaleX(0);
  transition: transform var(--bb-motion-duration-base) var(--bb-motion-ease-standard);
}
.md-tabs__item--active .md-tabs__link,
.md-tabs__link[aria-current="page"] {
  color: var(--bb-color-text);
  font-weight: var(--bb-font-weight-bold);
}
.md-tabs__item--active .md-tabs__link::after,
.md-tabs__link[aria-current="page"]::after {
  transform: scaleX(1);
}
.md-tabs__list {
  position: relative;
  z-index: 0;
}

/* ---------- Drawer (below 1220px): the same site links as the header, pinned above the scrolling nav ---------- */
.bb-docs-drawer {
  display: none;
}
@media (max-width: 76.1875em) {
  .md-sidebar--primary {
    --bb-docs-drawer-w: min(86vw, 20rem);
    --bb-docs-drawer-h: 168px;
    width: var(--bb-docs-drawer-w);
  }
  [dir="ltr"] .md-sidebar--primary {
    left: calc(var(--bb-docs-drawer-w) * -1);
  }
  [data-md-toggle="drawer"]:checked ~ .md-container .md-sidebar--primary {
    transform: translateX(var(--bb-docs-drawer-w));
  }
  .md-sidebar--primary:has(.bb-docs-drawer--plain) {
    --bb-docs-drawer-h: 120px;
  }
  .md-sidebar--primary .md-sidebar__scrollwrap {
    top: var(--bb-docs-drawer-h);
  }
  .bb-docs-drawer {
    position: absolute;
    inset: 0 0 auto 0;
    height: var(--bb-docs-drawer-h);
    box-sizing: border-box;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-content: center;
    gap: var(--bb-space-2);
    padding: var(--bb-space-3);
    background-color: var(--bb-color-bg);
    border-bottom: 1px solid var(--bb-color-border);
  }
  .bb-docs-drawer .bb-docs-back {
    grid-column: 1 / -1;
  }
  .bb-docs-drawer a:not(.bb-btn),
  .bb-docs-drawer .bb-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--bb-space-2);
    min-height: var(--bb-docs-control);
    padding-inline: var(--bb-space-3);
    border-radius: var(--bb-radius-pill);
    font-size: 0.7rem;
    font-weight: var(--bb-font-weight-medium);
    text-decoration: none;
    white-space: nowrap;
  }
  .bb-docs-drawer a:not(.bb-btn) {
    color: var(--bb-color-text);
    background-color: var(--bb-color-surface-2);
  }
  .bb-docs-drawer a:not(.bb-btn):hover {
    background-color: var(--bb-color-surface-3);
  }
  .bb-docs-drawer .bb-docs-back {
    background-color: transparent;
    border: 1px solid var(--bb-color-border);
  }
}

/* ---------- Previous / next cards ---------- */
.md-footer {
  background-color: var(--bb-color-bg);
  color: var(--bb-color-text);
}
.md-footer__inner:not([hidden]) {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--bb-space-4);
  padding: var(--bb-space-7) var(--bb-docs-gutter) var(--bb-space-6);
  overflow: visible;
}
.md-footer__link {
  display: flex;
  align-items: center;
  gap: var(--bb-space-3);
  min-width: 0;
  margin: 0;
  padding: var(--bb-space-4) var(--bb-space-5);
  border: 1px solid var(--bb-color-border);
  border-radius: var(--bb-radius-lg);
  background-color: var(--bb-color-surface);
  color: var(--bb-color-text);
  overflow: hidden;
  transition:
    border-color var(--bb-motion-duration-base) var(--bb-motion-ease-standard),
    background-color var(--bb-motion-duration-base) var(--bb-motion-ease-standard);
}
.md-footer__link--prev {
  grid-column: 1;
}
.md-footer__link--prev,
.md-footer__link--next,
[dir="ltr"] .md-footer__link--next,
[dir="ltr"] .md-footer__link--prev {
  margin: 0;
  max-width: none;
}
.md-footer__link--next {
  grid-column: 2;
  flex-direction: row;
  justify-content: space-between;
  text-align: end;
}
.md-footer__link:hover,
.md-footer__link:focus-visible {
  border-color: var(--bb-color-primary-border);
  background-color: var(--bb-color-surface-2);
  opacity: 1;
}
.md-footer__title {
  flex-grow: 1;
  min-width: 0;
  max-width: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  font-size: 0.8rem;
  font-weight: var(--bb-font-weight-bold);
  color: var(--bb-color-text);
  white-space: normal;
}
.md-footer__direction {
  font-size: 0.65rem;
  font-weight: var(--bb-font-weight-medium);
  color: var(--bb-color-text-muted);
  opacity: 1;
}
.md-footer__link .md-ellipsis {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.md-footer__button.md-icon {
  display: inline-grid;
  place-items: center;
  flex-shrink: 0;
  width: var(--bb-docs-control);
  height: var(--bb-docs-control);
  margin: 0;
  padding: 0;
  border-radius: var(--bb-radius-pill);
  background-color: var(--bb-color-surface-2);
  color: var(--bb-color-text);
  transition:
    transform var(--bb-motion-duration-base) var(--bb-motion-ease-standard),
    background-color var(--bb-motion-duration-base) var(--bb-motion-ease-standard);
}
.md-footer__link:hover .md-footer__button,
.md-footer__link:focus-visible .md-footer__button {
  background-color: var(--bb-color-primary-fill);
  color: var(--bb-color-on-primary);
}
.md-footer__link--next:hover .md-footer__button {
  transform: translateX(3px);
}
.md-footer__link--prev:hover .md-footer__button {
  transform: translateX(-3px);
}
@media (max-width: 47.9375em) {
  .md-footer__inner:not([hidden]) {
    grid-template-columns: 1fr;
  }
  .md-footer__link--prev,
  .md-footer__link--next {
    grid-column: 1;
  }
}

/* ---------- Shared footer (same markup and data as the landing footer) ---------- */
.md-footer .bb-footer {
  font-size: 0.7rem;
}
.md-footer .bb-footer .bb-container {
  max-width: 61rem;
  margin-inline: auto;
  padding-inline: var(--bb-docs-gutter);
}
.md-footer .bb-footer__grid {
  gap: var(--bb-space-6) var(--bb-space-5);
}
.md-footer .bb-footer__about p {
  line-height: 1.5;
}
.md-footer .bb-brand__mark img {
  display: block;
  width: 100%;
  height: 100%;
}
.md-footer .bb-footer__heading {
  font-size: 0.7rem;
  color: var(--bb-color-text);
  font-weight: var(--bb-font-weight-bold);
}
.md-footer .bb-footer ul {
  gap: var(--bb-space-2);
}
.md-footer .bb-footer a {
  color: var(--bb-color-text-muted);
}
.md-footer .bb-footer a:hover {
  color: var(--bb-color-text);
}
.md-footer .bb-footer .bb-brand {
  color: var(--bb-color-text);
}
.md-footer .bb-footer__bottom {
  align-items: center;
  font-size: 0.7rem;
}
.md-footer .bb-footer__bottom p {
  flex-wrap: wrap;
}
.md-footer .bb-segmented label {
  font-size: 0.7rem;
  color: var(--bb-color-text);
}

@media (prefers-reduced-motion: reduce) {
  .bb-docs-header *,
  .md-tabs *,
  .md-footer *,
  .bb-docs-drawer * {
    transition: none !important;
    transform: none !important;
  }
  .md-tabs__item--active .md-tabs__link::after,
  .md-tabs__link[aria-current="page"]::after {
    transform: scaleX(1) !important;
  }
}