.app-shell {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  width: 100%;
  max-width: 100vw;
  min-width: 0;
  transition: grid-template-columns 0.2s ease;
}

.sidebar {
  position: sticky;
  top: 0;
  z-index: 55;
  height: 100vh;
  overflow: visible;
  border-right: 1px solid var(--line);
  background: #202832;
  color: #f8fafc;
  transition: width 0.2s ease, transform 0.18s ease;
}

.brand {
  position: relative;
  display: flex;
  gap: 12px;
  align-items: center;
  min-height: 81px;
  padding: 22px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-copy {
  min-width: 0;
}

.brand-title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand-subtitle {
  margin-top: 3px;
  color: #b6c0ce;
  font-size: 12px;
  white-space: nowrap;
}

.sidebar-collapse-button {
  display: inline-grid;
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  margin-left: auto;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 9px;
  padding: 0;
  background: rgba(255, 255, 255, 0.05);
  color: #cbd5e1;
}

.sidebar-collapse-button:hover,
.sidebar-collapse-button:focus-visible {
  border-color: rgba(75, 192, 173, 0.62);
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.sidebar-collapse-button:focus-visible {
  outline: 2px solid rgba(75, 192, 173, 0.52);
  outline-offset: 2px;
}

.sidebar-collapse-button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.6;
}

.sidebar-collapse-chevron {
  transition: transform 0.2s ease;
}

.side-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 10px;
}

.nav-section {
  position: relative;
}

.nav-primary-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 36px;
  align-items: stretch;
}

.nav-section:not(.has-submenu) .nav-primary-row {
  grid-template-columns: 1fr;
}

.nav-primary-action,
.nav-expand-toggle,
.nav-child-action {
  border: 0;
  background: transparent;
  color: #dbe4ef;
  text-align: left;
}

.nav-primary-action {
  display: flex;
  align-items: center;
  gap: 11px;
  width: 100%;
  min-height: 44px;
  padding: 10px 8px 10px 14px;
  text-align: left;
}

.nav-primary-icon {
  flex: 0 0 auto;
  width: 19px;
  height: 19px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.nav-primary-label {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-expand-toggle {
  display: grid;
  width: 36px;
  min-height: 44px;
  place-items: center;
  padding: 0;
  cursor: default;
  pointer-events: none;
}

.nav-expand-toggle span {
  display: block;
  font-size: 22px;
  line-height: 1;
  transition: transform 0.15s ease;
}

.nav-primary-row:hover,
.nav-section.is-active > .nav-primary-row {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.nav-primary-row:hover .nav-primary-action,
.nav-primary-row:hover .nav-expand-toggle,
.nav-section.is-active > .nav-primary-row .nav-primary-action,
.nav-section.is-active > .nav-primary-row .nav-expand-toggle {
  color: #fff;
}

.nav-section.is-active > .nav-primary-row {
  box-shadow: inset 3px 0 0 var(--primary);
  background: rgba(20, 125, 111, 0.28);
}

.nav-inline-submenu {
  display: none;
  padding: 3px 0 6px 14px;
}

.nav-child-action {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 36px;
  padding: 7px 10px 7px 14px;
  color: #bfc9d6;
  font-size: 13px;
}

.nav-child-action:hover,
.nav-child-action.is-active {
  color: #fff;
}

.nav-child-action.is-active {
  background: rgba(20, 125, 111, 0.24);
  box-shadow: inset 2px 0 0 #4bc0ad;
}

.nav-status-label {
  flex: 0 0 auto;
  color: #93a0b0;
  font-size: 11px;
}

.nav-flyout {
  position: absolute;
  top: 0;
  left: calc(100% + 8px);
  z-index: 56;
  display: none;
  width: 224px;
  border: 1px solid var(--line);
  padding: 6px;
  background: #fff;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.16);
  opacity: 0;
  transform: translateX(-4px);
}

.nav-flyout::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: -9px;
  width: 9px;
  content: "";
}

.nav-section.is-hovered .nav-flyout {
  display: grid;
  opacity: 1;
  transform: translateX(0);
  animation: nav-flyout-in 0.12s ease-out;
}

@media (min-width: 821px) and (hover: hover) and (pointer: fine) {
  .nav-section:hover .nav-flyout {
    display: grid;
    opacity: 1;
    transform: translateX(0);
    animation: nav-flyout-in 0.12s ease-out;
  }
}

@media (hover: none), (pointer: coarse) {
  .nav-expand-toggle {
    cursor: pointer;
    pointer-events: auto;
  }

  .nav-section.is-expanded .nav-expand-toggle span {
    transform: rotate(90deg);
  }

  .nav-section.is-expanded .nav-inline-submenu {
    display: grid;
  }
}

.nav-flyout-title {
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.nav-flyout .nav-child-action {
  color: var(--text);
}

.nav-flyout .nav-child-action:hover {
  background: #f4f7fa;
  color: var(--primary-dark);
}

.nav-flyout .nav-child-action.is-active {
  background: var(--primary-soft);
  box-shadow: inset 2px 0 0 var(--primary);
  color: var(--primary-dark);
}

.nav-flyout .nav-status-label {
  color: var(--muted);
}

@keyframes nav-flyout-in {
  from {
    opacity: 0;
    transform: translateX(-4px);
  }
}

.app-main {
  min-width: 0;
  max-width: 100%;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 14px;
  height: 64px;
  min-height: 64px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  min-width: 0;
}

.topbar-context {
  flex: 1 1 auto;
  min-width: 0;
}

.secondary-nav-shell {
  position: sticky;
  top: 64px;
  z-index: 30;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.secondary-nav-scroll {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  scrollbar-width: thin;
}

.secondary-nav-list {
  display: flex;
  align-items: stretch;
  width: max-content;
  min-width: 100%;
  min-height: 50px;
  padding: 0 22px;
}

.secondary-nav-item {
  position: relative;
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 6px;
  border: 0;
  padding: 0 16px;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
}

.secondary-nav-item::after {
  position: absolute;
  right: 16px;
  bottom: 0;
  left: 16px;
  height: 2px;
  background: transparent;
  content: "";
}

.secondary-nav-item:hover {
  color: var(--text);
}

.secondary-nav-item.is-active {
  color: var(--primary-dark);
  font-weight: 700;
}

.secondary-nav-item.is-active::after {
  background: var(--primary);
}

.secondary-nav-status {
  color: #8a6a22;
  font-size: 11px;
  font-weight: 500;
}

.topbar-title {
  overflow: hidden;
  font-size: 18px;
  font-weight: 750;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-subtitle {
  margin-top: 3px;
  color: var(--muted);
  font-size: 13px;
}

.topbar-actions {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.menu-button {
  display: none;
}

.content {
  min-width: 0;
  max-width: 100%;
  padding: 22px 24px 28px;
}

.page-panel {
  min-width: 0;
  max-width: 100%;
  min-height: calc(100vh - 116px);
}

.sidebar-backdrop {
  display: none;
}

@media (min-width: 821px) {
  .app-shell.sidebar-collapsed {
    grid-template-columns: 76px minmax(0, 1fr);
  }

  .sidebar-collapsed .brand {
    flex-direction: column;
    gap: 8px;
    justify-content: center;
    min-height: 112px;
    padding: 14px 10px;
  }

  .sidebar-collapsed .brand-copy {
    display: none;
  }

  .sidebar-collapsed .sidebar-collapse-button {
    margin-left: 0;
  }

  .sidebar-collapsed .sidebar-collapse-chevron {
    transform: rotate(180deg);
    transform-origin: center;
  }

  .sidebar-collapsed .side-nav {
    padding-right: 8px;
    padding-left: 8px;
  }

  .sidebar-collapsed .nav-primary-row,
  .sidebar-collapsed .nav-section:not(.has-submenu) .nav-primary-row {
    grid-template-columns: 1fr;
  }

  .sidebar-collapsed .nav-primary-action {
    justify-content: center;
    min-height: 46px;
    padding: 10px;
  }

  .sidebar-collapsed .nav-primary-label,
  .sidebar-collapsed .nav-expand-toggle,
  .sidebar-collapsed .nav-inline-submenu {
    display: none;
  }

  .sidebar-collapsed .nav-section.is-active > .nav-primary-row {
    box-shadow: inset 2px 0 0 var(--primary);
  }
}

@media (max-width: 820px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 70;
    width: 240px;
    overflow-x: hidden;
    overflow-y: auto;
    transform: translateX(-100%);
  }

  .sidebar-collapse-button {
    display: none;
  }

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

  .nav-flyout {
    display: none !important;
  }

  .nav-inline-submenu {
    padding-right: 4px;
  }

  .nav-expand-toggle {
    cursor: pointer;
    pointer-events: auto;
  }

  .nav-section.is-expanded .nav-expand-toggle span {
    transform: rotate(90deg);
  }

  .nav-section.is-expanded .nav-inline-submenu {
    display: grid;
  }

  .menu-button {
    display: inline-flex;
  }

  .topbar {
    gap: 10px;
    height: 64px;
    min-height: 64px;
    padding: 12px 14px;
  }

  .topbar-title {
    font-size: 16px;
  }

  .topbar-subtitle {
    display: none;
  }

  .secondary-nav-shell {
    top: 64px;
  }

  .secondary-nav-list {
    min-height: 48px;
    padding: 0 8px;
  }

  .secondary-nav-item {
    padding: 0 12px;
  }

  .secondary-nav-item::after {
    right: 12px;
    left: 12px;
  }

  .topbar-actions {
    gap: 8px;
  }

  .topbar-actions .user-chip {
    max-width: 96px;
  }

  .content {
    padding: 14px;
  }

  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    z-index: 65;
    display: block;
    border: 0;
    background: rgba(15, 23, 42, 0.34);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease;
  }

  .sidebar-backdrop.is-visible {
    opacity: 1;
    pointer-events: auto;
  }

  body.has-open-sidebar {
    overflow: hidden;
  }
}

@media (max-width: 420px) {
  .topbar {
    gap: 8px;
    padding-right: 10px;
    padding-left: 10px;
  }

  .topbar-actions {
    gap: 6px;
  }

  .topbar-actions .user-chip {
    max-width: 72px;
    padding-right: 8px;
    padding-left: 8px;
  }

  .topbar .ghost-button {
    flex: 0 0 auto;
    padding-right: 10px;
    padding-left: 10px;
    white-space: nowrap;
  }
}