/* ============================================================================
   ATOM Design System — Page chrome elements
   ----------------------------------------------------------------------------
   Every block here is an independent element-level component:
     atom-site-header      atom-nav-link        atom-icon-button
     atom-side-navigation  atom-page-header     atom-card-grid
     atom-component-card   atom-site-footer     atom-search-dialog
     atom-badge-dot        atom-content-placeholder
   ========================================================================== */

/* ---------------------------------------------------------------------------
   atom-site-header
   ------------------------------------------------------------------------ */
.atom-site-header {
  background: var(--atom-bg-canvas);
  border-bottom: 1px solid transparent;
}

.atom-site-header__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: var(--atom-header-h);
  padding-inline: var(--atom-x4);
  gap: var(--atom-x4);
}

/* Three grid children only — start / nav / actions. The drawer trigger lives
   inside `start` so the grid never wraps to a second row. */
.atom-site-header__start {
  justify-self: start;
  display: flex;
  align-items: center;
  gap: var(--atom-x2);
}

.atom-site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--atom-x2);
  height: 40px;
  color: var(--atom-fg-neutral);
}

.atom-site-header__mark {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  color: var(--atom-primary-600);
}

.atom-site-header__wordmark {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
}

.atom-site-header__nav {
  display: flex;
  align-items: center;
  gap: 2px;
  justify-self: center;
}

.atom-site-header__actions {
  display: flex;
  align-items: center;
  gap: 6px;
  justify-self: end;
}

/* The nav collapses below 968px; the drawer trigger takes its place.
   Scoped through __start so it outranks .atom-icon-button's display. */
.atom-site-header__start .atom-site-header__menu-trigger {
  display: none;
}

@media (max-width: 967px) {
  .atom-site-header__inner {
    grid-template-columns: 1fr auto;
  }
  .atom-site-header__nav {
    display: none;
  }
  .atom-site-header__start .atom-site-header__menu-trigger {
    display: inline-flex;
  }
}

/* ---------------------------------------------------------------------------
   atom-nav-link
   ------------------------------------------------------------------------ */
.atom-nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--atom-x1);
  height: 36px;
  padding-inline: var(--atom-x3);
  border-radius: var(--atom-radius-r2);
  font-size: 14px;
  font-weight: 400;
  white-space: nowrap;
  color: var(--atom-fg-neutral-muted);
  transition: background-color var(--atom-duration-fast) ease,
    color var(--atom-duration-fast) ease;
}

.atom-nav-link:hover {
  background: var(--atom-bg-nav-hover);
  color: var(--atom-fg-neutral);
}

.atom-nav-link[aria-current="page"] {
  background: var(--atom-bg-nav-active);
  color: var(--atom-fg-neutral);
  font-weight: 500;
}

.atom-nav-link__caret {
  width: 14px;
  height: 14px;
  opacity: 0.7;
}

/* ---------------------------------------------------------------------------
   atom-icon-button
   ------------------------------------------------------------------------ */
.atom-icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--atom-radius-full);
  color: var(--atom-fg-neutral-muted);
  transition: background-color var(--atom-duration-fast) ease,
    color var(--atom-duration-fast) ease;
}

.atom-icon-button:hover {
  background: var(--atom-bg-nav-active);
  color: var(--atom-fg-neutral);
}

.atom-icon-button svg {
  width: 18px;
  height: 18px;
}

/* ---------------------------------------------------------------------------
   atom-side-navigation
   ------------------------------------------------------------------------ */
.atom-side-navigation {
  height: 100%;
  overflow-y: auto;
  padding: var(--atom-x3) var(--atom-x2) 80px;
}

@media (min-width: 1120px) {
  .atom-side-navigation {
    padding: var(--atom-x4) 10px 80px;
  }
}

@media (min-width: 1280px) {
  .atom-side-navigation {
    padding: var(--atom-x5) var(--atom-x3) 80px;
  }
}

.atom-side-navigation__group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.atom-side-navigation__group + .atom-side-navigation__group {
  margin-top: var(--atom-x5);
}

.atom-side-navigation__group-label {
  display: flex;
  align-items: center;
  height: var(--atom-sidebar-item-h);
  padding-inline: var(--atom-x2);
  font-size: 12px;
  font-weight: 400;
  color: var(--atom-fg-neutral-subtle);
}

/* --- menu item --- */
.atom-side-navigation__item {
  position: relative;
  display: flex;
  align-items: center;
  min-height: var(--atom-sidebar-item-h);
  padding: 6px var(--atom-x2);
  border-radius: var(--atom-radius-r2);
  font-size: 14px;
  color: var(--atom-fg-side-item);
  transition: color var(--atom-duration-fast) ease;
}

/* The active/hover pill is drawn slightly wider than the text box, matching
   the source's ::before treatment. */
.atom-side-navigation__item::before {
  content: "";
  position: absolute;
  inset: 0 -5px;
  border-radius: var(--atom-radius-r2);
  background: transparent;
  transition: background-color var(--atom-duration-fast) ease;
}

.atom-side-navigation__item:hover::before {
  background: var(--atom-bg-side-hover);
}

.atom-side-navigation__item[aria-current="page"] {
  color: var(--atom-fg-neutral);
  font-weight: 500;
}

.atom-side-navigation__item[aria-current="page"]::before {
  background: var(--atom-bg-side-active);
}

.atom-side-navigation__label {
  position: relative;
  display: inline-block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* --- collapsible folder (Deprecated) --- */
.atom-side-navigation__collapsible-trigger {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--atom-x2);
  width: 100%;
  min-height: var(--atom-sidebar-item-h);
  padding: 6px var(--atom-x2);
  border-radius: var(--atom-radius-r2);
  font-size: 14px;
  text-align: left;
  color: var(--atom-fg-side-item);
}

.atom-side-navigation__collapsible-trigger::before {
  content: "";
  position: absolute;
  inset: 0 -5px;
  border-radius: var(--atom-radius-r2);
  background: transparent;
  transition: background-color var(--atom-duration-fast) ease;
}

.atom-side-navigation__collapsible-trigger:hover::before {
  background: var(--atom-bg-side-hover);
}

.atom-side-navigation__collapsible-caret {
  position: relative;
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  transition: transform var(--atom-duration-base) var(--atom-ease-out);
}

.atom-side-navigation__collapsible-trigger[aria-expanded="true"]
  .atom-side-navigation__collapsible-caret {
  transform: rotate(90deg);
}

.atom-side-navigation__collapsible-content {
  display: none;
  flex-direction: column;
  gap: 2px;
  margin-left: var(--atom-x3);
  padding-left: var(--atom-x2);
  border-left: 1px solid var(--atom-border-subtle);
}

.atom-side-navigation__collapsible-content[data-open="true"] {
  display: flex;
}

/* ---------------------------------------------------------------------------
   atom-badge-dot — the "recommended doc" marker
   ------------------------------------------------------------------------ */
.atom-badge-dot {
  display: inline-flex;
  align-items: center;
  height: 1.36em;
  margin-left: var(--atom-x2);
  vertical-align: top;
  flex-shrink: 0;
}

.atom-badge-dot__dot {
  width: 7px;
  height: 7px;
  border-radius: var(--atom-radius-full);
  background: var(--atom-primary-600);
}

/* ---------------------------------------------------------------------------
   atom-page-header
   ------------------------------------------------------------------------ */
.atom-page-header {
  margin-bottom: var(--atom-x10);
}

@media (min-width: 768px) {
  .atom-page-header {
    margin-bottom: var(--atom-x14);
  }
}

.atom-page-header__title {
  font-size: 2rem;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.025em;
  text-wrap: balance;
  color: var(--atom-fg-neutral);
}

@media (min-width: 768px) {
  .atom-page-header__title {
    font-size: 3rem;
  }
}

@media (min-width: 1280px) {
  .atom-page-header__title {
    font-size: 3.75rem;
  }
}

.atom-page-header__subtitle {
  margin-top: var(--atom-x4);
  font-size: 16px;
  font-weight: 300;
  text-wrap: pretty;
  color: var(--atom-fg-neutral-muted);
}

/* ---------------------------------------------------------------------------
   atom-card-grid
   ------------------------------------------------------------------------ */
/* Two fixed columns while the drawer layout is in play, then auto-fill: the
   shell is full-bleed, so a wider viewport should buy more cards rather than
   wider ones. 300px is the largest minimum that still fits three columns at
   1280 — the count that matches the source — and it lands on 3 / 5 / 7 columns
   at 1280 / 1920 / 2560 with the card itself holding steady near 305px.
   auto-fill, not auto-fit: an empty trailing track keeps the last row's cards
   the same size as every other row instead of stretching them. */
.atom-card-grid {
  display: grid;
  /* One column on a phone. Two 152px cards side by side scaled every preview to
     0.38 and nothing inside them was readable; the canvas is 400px wide. */
  grid-template-columns: minmax(0, 1fr);
  column-gap: var(--atom-x5);
  row-gap: var(--atom-x6);
  padding-bottom: var(--atom-x10);
}

@media (min-width: 520px) {
  .atom-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .atom-card-grid {
    grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr));
    column-gap: var(--atom-x6);
    row-gap: var(--atom-x8);
  }
}

.atom-card-grid__empty {
  grid-column: 1 / -1;
  padding: var(--atom-x10) 0;
  font-size: 15px;
  color: var(--atom-fg-neutral-muted);
}

/* ---------------------------------------------------------------------------
   atom-component-card
   ------------------------------------------------------------------------ */
.atom-component-card {
  display: flex;
  flex-direction: column;
  gap: var(--atom-x3);
}

@media (min-width: 768px) {
  .atom-component-card {
    gap: var(--atom-x5);
  }
}

.atom-component-card__frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--atom-radius-r2);
  background: var(--atom-bg-placeholder);
}

/* The live preview replaces the source's <img>: same absolute fill, same
   600ms hover scale. */
.atom-component-card__preview {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  opacity: 0;
  transition: opacity var(--atom-duration-base) ease,
    transform var(--atom-duration-slow) var(--atom-ease-out);
  /* Previews are decorative inside the card — the whole card is one link. */
  pointer-events: none;
  user-select: none;
  container-type: inline-size;
}

.atom-component-card__preview[data-loaded="true"] {
  opacity: 1;
}

.atom-component-card:hover .atom-component-card__preview[data-loaded="true"] {
  transform: scale(1.05);
}

.atom-component-card__title {
  font-size: 16px;
  line-height: 24px;
  font-weight: 500;
  color: var(--atom-fg-neutral);
}

@media (min-width: 768px) {
  .atom-component-card__title {
    font-size: 20px;
    line-height: 30px;
  }
}

.atom-component-card__description {
  margin-top: var(--atom-x1);
  font-size: 14px;
  line-height: 20px;
  color: var(--atom-fg-neutral-muted);
  word-break: keep-all;
  display: -webkit-box;
  /* Two lines. At one line the longest descriptions were cut mid-word — Tooltip
     ended on "(He…". Every current description fits in two. */
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.atom-component-card__deprecated {
  display: inline-block;
  margin-left: var(--atom-x2);
  padding: 1px 6px;
  border-radius: var(--atom-radius-r1);
  background: var(--atom-bg-neutral-weak);
  font-size: 11px;
  font-weight: 500;
  color: var(--atom-fg-neutral-muted);
  vertical-align: middle;
}

/* ---------------------------------------------------------------------------
   atom-content-placeholder — the skeleton shown until a preview resolves.
   Shared between the card frame and the content-placeholder preview itself.
   ------------------------------------------------------------------------ */
.atom-content-placeholder {
  display: grid;
  place-items: center;
  background: var(--atom-bg-placeholder);
}

.atom-content-placeholder--fill {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.atom-content-placeholder--hidden {
  opacity: 0;
  transition: opacity var(--atom-duration-base) ease;
}

.atom-content-placeholder__icon {
  width: 64px;
  height: 64px;
  color: var(--atom-fg-placeholder-icon);
}

.atom-content-placeholder--failed .atom-content-placeholder__icon {
  color: var(--atom-red-600);
  opacity: 0.5;
}

/* ---------------------------------------------------------------------------
   atom-site-footer
   ------------------------------------------------------------------------ */
.atom-site-footer {
  display: flex;
  flex-direction: column;
  gap: var(--atom-x10);
  margin-top: var(--atom-x12);
  padding-top: var(--atom-x10);
  border-top: 1px solid var(--atom-border-subtle);
}

@media (min-width: 768px) {
  .atom-site-footer {
    flex-direction: row;
    justify-content: space-between;
  }
}

.atom-site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--atom-x3);
}

.atom-site-footer__mark {
  width: 16px;
  height: auto;
  color: var(--atom-fg-neutral);
  align-self: flex-start;
}

@media (min-width: 768px) {
  .atom-site-footer__mark {
    width: 20px;
  }
}

.atom-site-footer__tagline {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--atom-fg-neutral);
}

.atom-site-footer__copyright {
  font-size: 12px;
  color: var(--atom-fg-neutral-muted);
}

.atom-site-footer__columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--atom-x6) var(--atom-x10);
  align-content: start;
}

@media (min-width: 768px) {
  .atom-site-footer__columns {
    grid-template-columns: repeat(2, minmax(120px, auto));
  }
}

.atom-site-footer__column-title {
  margin-bottom: var(--atom-x3);
  font-size: 13px;
  font-weight: 600;
  color: var(--atom-fg-neutral);
}

.atom-site-footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--atom-x2);
}

.atom-site-footer__link {
  font-size: 13px;
  color: var(--atom-fg-neutral-muted);
  transition: color var(--atom-duration-fast) ease;
  width: fit-content;
}

.atom-site-footer__link:hover {
  color: var(--atom-fg-neutral);
}

/* ---------------------------------------------------------------------------
   atom-search-dialog
   ------------------------------------------------------------------------ */
.atom-search-dialog {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
  padding: 12vh var(--atom-x4) var(--atom-x4);
  justify-content: center;
  align-items: flex-start;
}

.atom-search-dialog[data-open="true"] {
  display: flex;
}

.atom-search-dialog__scrim {
  position: absolute;
  inset: 0;
  background: var(--atom-bg-scrim);
}

.atom-search-dialog__panel {
  position: relative;
  width: 100%;
  max-width: 560px;
  max-height: 70vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--atom-border-subtle);
  border-radius: var(--atom-radius-r4);
  background: var(--atom-bg-layer);
  box-shadow: var(--atom-shadow-s3);
}

.atom-search-dialog__field {
  display: flex;
  align-items: center;
  gap: var(--atom-x3);
  padding: var(--atom-x4);
  border-bottom: 1px solid var(--atom-border-subtle);
  color: var(--atom-fg-neutral-muted);
}

.atom-search-dialog__field svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.atom-search-dialog__input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: none;
  font-size: 15px;
  color: var(--atom-fg-neutral);
  outline: none;
}

.atom-search-dialog__input::placeholder {
  color: var(--atom-fg-neutral-subtle);
}

/* The native clear affordance collides with the shortcut hint. */
.atom-search-dialog__input::-webkit-search-cancel-button,
.atom-search-dialog__input::-webkit-search-decoration {
  -webkit-appearance: none;
  appearance: none;
}

.atom-search-dialog__kbd {
  padding: 2px 6px;
  border: 1px solid var(--atom-border-subtle);
  border-radius: var(--atom-radius-r1);
  font-family: var(--atom-font-mono);
  font-size: 11px;
  color: var(--atom-fg-neutral-muted);
}

.atom-search-dialog__results {
  overflow-y: auto;
  padding: var(--atom-x2);
}

.atom-search-dialog__result {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px var(--atom-x3);
  border-radius: var(--atom-radius-r2);
}

.atom-search-dialog__result:hover,
.atom-search-dialog__result[data-active="true"] {
  background: var(--atom-bg-side-active);
}

.atom-search-dialog__result-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--atom-fg-neutral);
}

.atom-search-dialog__result-description {
  font-size: 12px;
  color: var(--atom-fg-neutral-muted);
  word-break: keep-all;
}

.atom-search-dialog__empty {
  padding: var(--atom-x6) var(--atom-x3);
  font-size: 14px;
  text-align: center;
  color: var(--atom-fg-neutral-muted);
}