.skip-link {
  position: absolute;
  top: var(--space-8);
  left: var(--space-8);
  z-index: 2;
  padding: var(--space-8) var(--space-16);
  background: var(--surface-card);
  font-weight: var(--fw-body-bold);
  transform: translateY(-200%);
}

.skip-link:focus-visible {
  transform: none;
}

.turbo-progress-bar {
  background-color: var(--interactive);
}

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
  transition: grid-template-columns var(--dur-base) var(--ease-out);
}

.app-shell--collapsed {
  grid-template-columns: var(--sidebar-width-collapsed) minmax(0, 1fr);
}

.app-sidebar {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-32);
  height: 100vh;
  padding: var(--space-24) var(--space-12);
  overflow: hidden;
  background: var(--surface-inverse);
  color: var(--text-on-dark);
}

.app-sidebar :focus-visible {
  outline-color: var(--focus-ring-on-dark);
  outline-offset: -2px;
}

/* ---------- brand: full wordmark or, collapsed, a vertical one ---------- */

.app-brand {
  position: relative;
  flex: none;
  height: var(--sidebar-brand-height);
  text-decoration: none;
}

.app-brand__full {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: 0 var(--space-12);
  white-space: nowrap;
}

.app-brand__name {
  color: var(--text-on-dark);
  font-family: var(--font-display);
  font-size: var(--fs-display-l);
  line-height: var(--lh-display);
  text-transform: uppercase;
}

.app-brand__long {
  color: var(--text-on-dark-muted);
  font-size: var(--fs-body-xs);
  font-weight: var(--fw-body-bold);
  line-height: var(--lh-body-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.app-brand__vertical {
  position: absolute;
  top: 0;
  left: calc((var(--sidebar-width-collapsed) - 2 * var(--space-12)) / 2);
  translate: -50% 0;
  color: var(--text-on-dark);
  font-family: var(--font-display);
  font-size: var(--fs-wordmark-vertical);
  line-height: var(--lh-display);
  text-transform: uppercase;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

/* ---------- footer: who else is online, the own account, the toggle ---------- */

.app-sidebar__footer {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
  margin-top: auto;
}

/* ---------- who else is online ---------- */

/* The line below separates the others from the own avatar. */
.app-sidebar__team {
  display: grid;
  gap: var(--space-8);
  padding: 0 var(--space-8) var(--space-16);
  border-bottom: var(--border-width) solid var(--border-on-dark);
}

.app-sidebar__team-heading,
.app-sidebar__team-empty {
  width: calc(var(--sidebar-width) - 2 * var(--space-12) - 2 * var(--space-8));
  margin: 0;
  color: var(--text-on-dark-muted);
  font-size: var(--fs-body-xs);
  font-weight: var(--fw-body-bold);
  line-height: var(--lh-body-xs);
  white-space: nowrap;
}

.app-sidebar__team-heading {
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.app-sidebar__team-empty {
  font-weight: var(--fw-body);
}

/* Collapsed, the avatars stand in a column under each other. */
.app-shell--collapsed .app-sidebar__team .avatar-stack {
  flex-direction: column;
  align-items: flex-start;
}

.app-shell--collapsed .app-sidebar__team .avatar-stack > li + li {
  margin-block-start: calc(var(--avatar-overlap, 0.25rem) * -1);
  margin-inline-start: 0;
}

.app-sidebar__toggle,
.app-sidebar__account {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  padding: var(--space-12);
  background: none;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-on-dark-muted);
  font-family: var(--font-body);
  font-size: var(--fs-body-xs);
  font-weight: var(--fw-body-bold);
  line-height: var(--lh-body-xs);
  white-space: nowrap;
  cursor: pointer;
}

.app-sidebar__toggle:hover,
.app-sidebar__account:hover {
  background: var(--sidebar-link-hover);
  color: var(--text-on-dark);
}

/* The icon sits on the centre line of the collapsed rail, so it only turns while the sidebar folds around it. */
.app-sidebar__toggle {
  padding-inline-start: calc(var(--sidebar-width-collapsed) / 2 - var(--space-12) - 0.625em);
}

.app-sidebar__toggle .icon {
  transition: transform var(--dur-base) var(--ease-out);
}

/* On the dark sidebar a Tanne avatar would vanish without a light ring. */
.app-sidebar .avatar {
  --avatar-ring: var(--text-on-dark);
}

.app-sidebar__account {
  anchor-name: --account-menu;
  padding: var(--space-8);
  color: var(--text-on-dark);
  font-size: var(--fs-body-s);
  line-height: var(--lh-body-s);
  text-align: start;
}

.app-sidebar__account-label {
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------- account menu: a popover in the top layer, so the sidebar's overflow never clips it ---------- */

.account-menu {
  position-anchor: --account-menu;
  position-area: top span-right;
  position-try-fallbacks: flip-block;
  inset: auto;
  min-width: 15rem;
  margin: var(--space-8) 0;
  padding: var(--space-8);
  background: var(--surface-card);
  border: var(--border-width) solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  color: var(--text-body);
}

/* The menu sits inside the sidebar in the DOM but on white. */
.account-menu :focus-visible {
  outline-color: var(--focus-ring);
  outline-offset: 0;
}

.account-menu .avatar {
  --avatar-ring: var(--surface-card);
}

.account-menu__who {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  margin: 0 0 var(--space-8);
  padding: var(--space-8) var(--space-8) var(--space-12);
  border-bottom: var(--border-width) solid var(--border-subtle);
}

.account-menu__name {
  display: block;
  font-weight: var(--fw-body-bold);
}

.account-menu__username {
  display: block;
  color: var(--text-muted);
  font-size: var(--fs-body-xs);
  line-height: var(--lh-body-xs);
}

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

.account-menu__sign-out {
  display: contents;
}

.account-menu__item {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  width: 100%;
  padding: var(--space-8);
  background: none;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-body);
  font-family: var(--font-body);
  font-size: var(--fs-body-s);
  font-weight: var(--fw-body-bold);
  line-height: var(--lh-body-s);
  text-align: start;
  text-decoration: none;
  cursor: pointer;
}

.account-menu__item:hover {
  background: var(--surface-hover);
}

.account-menu__item .icon {
  color: var(--text-brand);
}

/* ---------- what fades when the sidebar collapses ----------
   Opacity only, never visibility: the faded texts stay the accessible names of their links and buttons. */

.app-brand__full,
.app-brand__vertical,
.app-sidebar__team-heading,
.app-sidebar__team-empty,
.app-sidebar__toggle-label,
.app-sidebar__account-label,
.navigation__label {
  transition: opacity var(--dur-fast) var(--ease-out);
}

.app-brand__vertical,
.app-shell--collapsed .app-brand__full,
.app-shell--collapsed .app-sidebar__team-heading,
.app-shell--collapsed .app-sidebar__team-empty,
.app-shell--collapsed .app-sidebar__toggle-label,
.app-shell--collapsed .app-sidebar__account-label,
.app-shell--collapsed .navigation__label {
  opacity: 0;
}

.app-shell--collapsed .app-brand__vertical {
  opacity: 1;
}

/* Only the collapsed rail hides the labels, so only there do the links and the account button need their tooltip. */
.app-shell:not(.app-shell--collapsed) :is(.navigation__link, .app-sidebar__account) + .tooltip {
  display: none;
}

.app-shell--collapsed .app-sidebar__toggle .icon {
  transform: rotate(180deg);
}

/* ---------- main ---------- */

.app-main {
  width: 100%;
  max-width: var(--container-max);
  padding: var(--space-40) var(--space-40) var(--space-64);
}

.app-main:focus {
  outline: none;
}

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

/* Narrow screens: the sidebar becomes a header bar and never collapses. */
@media (max-width: 56rem) {
  .app-shell,
  .app-shell--collapsed {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto 1fr;
  }

  .app-sidebar {
    position: static;
    flex-flow: row wrap;
    align-items: center;
    gap: var(--space-8) var(--space-24);
    height: auto;
    padding: var(--space-12) var(--space-16);
  }

  .app-brand {
    height: auto;
  }

  .app-brand__full {
    padding: 0;
  }

  .app-brand__vertical,
  .app-sidebar__toggle,
  :is(.navigation__link, .app-sidebar__account) + .tooltip {
    display: none;
  }

  .app-shell--collapsed .app-brand__full,
  .app-shell--collapsed .app-sidebar__team-heading,
  .app-shell--collapsed .app-sidebar__team-empty,
  .app-shell--collapsed .app-sidebar__account-label,
  .app-shell--collapsed .navigation__label {
    opacity: 1;
  }

  .app-sidebar__footer {
    flex-basis: 100%;
    margin-top: 0;
    padding-top: var(--space-8);
  }

  .app-sidebar__team {
    grid-auto-flow: column;
    justify-content: start;
    align-items: center;
    gap: var(--space-12);
  }

  .app-sidebar__team-heading,
  .app-sidebar__team-empty {
    width: auto;
  }

  .app-shell--collapsed .app-sidebar__team .avatar-stack {
    flex-direction: row;
  }

  .app-shell--collapsed .app-sidebar__team .avatar-stack > li + li {
    margin-block-start: 0;
    margin-inline-start: calc(var(--avatar-overlap, 0.25rem) * -1);
  }

  .app-main {
    padding: var(--space-24) var(--space-16) var(--space-48);
  }
}