.sidebar {
  position: sticky;
  top: 0;
  display: flex;
  width: var(--sidebar-width);
  height: 100vh;
  flex: 0 0 auto;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--color-grid);
  background: var(--color-surface);
  transition: width var(--motion-fast) ease;
}

.sidebar__brand {
  flex: 0 0 auto;
  padding: 18px var(--space-4);
  border-bottom: 1px solid var(--color-grid);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-ink);
  text-decoration: none;
}

.brand__mark,
.navigation-icon,
.operator-area__avatar {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
}

.brand__mark {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-2);
  background: var(--color-ink);
  color: var(--color-surface);
  font-size: 11px;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}

.primary-navigation {
  flex: 1;
  overflow-x: hidden;
  overflow-y: auto;
  padding: var(--space-2) 0 var(--space-4);
}

.navigation-group__label {
  padding: var(--space-4) var(--space-4) var(--space-2);
  margin: 0;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.navigation-list {
  padding: 0;
  margin: 0;
  list-style: none;
}

.navigation-item {
  position: relative;
  display: flex;
  min-height: 38px;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  border-left: 3px solid transparent;
  color: var(--color-ink);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
}

a.navigation-item:hover,
a.navigation-item:focus-visible {
  background: var(--color-bench);
}

.navigation-item.is-active {
  border-left-color: var(--color-ink);
  background: var(--color-bench);
  font-weight: 500;
}

.navigation-item.is-disabled {
  color: var(--color-ink-soft);
  cursor: not-allowed;
}

.navigation-icon {
  width: 20px;
  height: 20px;
  border: 1px solid var(--color-grid);
  border-radius: var(--radius-1);
  color: var(--color-ink-soft);
  font-size: 9px;
}

.navigation-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}

.navigation-state {
  color: var(--color-grid);
  font-family: var(--font-mono);
  font-size: 14px;
}

.sidebar__footer {
  flex: 0 0 auto;
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--color-grid);
}

.sidebar-toggle {
  display: flex;
  width: 100%;
  min-height: 34px;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 1px solid var(--color-grid);
  border-radius: var(--radius-2);
  background: var(--color-bench);
  color: var(--color-ink-soft);
  cursor: pointer;
  font-size: 12px;
}

.sidebar-toggle__icon {
  font-family: var(--font-mono);
  font-size: 16px;
}

.app-shell.is-sidebar-collapsed .sidebar {
  width: var(--sidebar-width-collapsed);
}

.app-shell.is-sidebar-collapsed .brand__name,
.app-shell.is-sidebar-collapsed .navigation-group__label,
.app-shell.is-sidebar-collapsed .navigation-label,
.app-shell.is-sidebar-collapsed .navigation-state,
.app-shell.is-sidebar-collapsed .sidebar-toggle__label {
  display: none;
}

.app-shell.is-sidebar-collapsed .navigation-item {
  justify-content: center;
  padding-right: 0;
  padding-left: 0;
}

.app-shell.is-sidebar-collapsed .sidebar-toggle__icon {
  transform: rotate(180deg);
}

.top-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  min-height: var(--header-height);
  flex: 0 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-2) var(--space-5);
  border-bottom: 1px solid var(--color-grid);
  background: var(--color-surface);
}

.top-header__context,
.top-header__status,
.operator-area,
.global-status {
  display: flex;
  align-items: center;
}

.top-header__context {
  min-width: 0;
  gap: var(--space-3);
}

.top-header__page {
  min-width: 0;
}

.top-header__title {
  display: block;
  overflow: hidden;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.breadcrumbs ol {
  display: flex;
  padding: 0;
  margin: 0 0 1px;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: 10px;
  list-style: none;
}

.breadcrumbs li:not(:last-child)::after {
  margin: 0 6px;
  content: "/";
  color: var(--color-grid);
}

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

.top-header__status {
  flex: 0 0 auto;
  gap: var(--space-3);
}

.environment-indicator,
.global-status,
.operator-area {
  min-height: 30px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 10px;
  white-space: nowrap;
}

.environment-indicator {
  padding: 0 var(--space-3);
  border: 1px solid var(--color-grid);
  color: var(--color-ink-soft);
}

.global-status {
  gap: 6px;
  padding: 0 var(--space-3);
  background: var(--color-slate-bg);
  color: var(--color-slate);
}

.global-status__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentcolor;
}

.operator-area {
  gap: var(--space-2);
  color: var(--color-ink-soft);
}

.operator-area__avatar {
  width: 28px;
  height: 28px;
  border: 1px solid var(--color-grid);
  border-radius: 50%;
  background: var(--color-bench);
  font-size: 9px;
}

.mobile-navigation-trigger {
  display: none;
}

@media (max-width: 1080px) and (min-width: 721px) {
  .sidebar {
    position: fixed;
    z-index: 20;
    width: var(--sidebar-width-collapsed);
  }

  .app-main {
    margin-left: var(--sidebar-width-collapsed);
  }

  .brand__name,
  .navigation-group__label,
  .navigation-label,
  .navigation-state,
  .sidebar-toggle {
    display: none;
  }

  .navigation-item {
    justify-content: center;
    padding-right: 0;
    padding-left: 0;
  }
}

@media (max-width: 720px) {
  .sidebar {
    position: fixed;
    z-index: 40;
    width: min(84vw, 300px);
    transform: translateX(-100%);
    box-shadow: var(--shadow-shell);
    transition: transform var(--motion-fast) ease;
  }

  .app-shell.is-mobile-navigation-open .sidebar {
    transform: translateX(0);
  }

  .sidebar__footer {
    display: none;
  }

  .mobile-navigation-trigger {
    display: inline-grid;
  }

  .mobile-overlay {
    position: fixed;
    inset: 0;
    z-index: 30;
    width: 100%;
    height: 100%;
    padding: 0;
    border: 0;
    background: var(--color-overlay);
  }

  .mobile-overlay.is-visible {
    display: block;
  }

  .top-header {
    padding-right: var(--space-3);
    padding-left: var(--space-3);
  }

  .global-status,
  .operator-area__label {
    display: none;
  }
}

@media (max-width: 440px) {
  .breadcrumbs {
    display: none;
  }

  .environment-indicator {
    max-width: 88px;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}