.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--header-height) 1fr;
  grid-template-areas:
    "sidebar header"
    "sidebar main";
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

.sidebar {
  grid-area: sidebar;
  background: var(--color-sidebar-bg);
  border-right: 1px solid var(--color-sidebar-border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  width: var(--sidebar-width);
  z-index: var(--z-index-fixed);
  transition: width var(--transition-normal), transform var(--transition-normal);
  box-shadow: 6px 0 24px rgba(15, 23, 42, 0.03);
}

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

.sidebar--mobile-hidden {
  transform: translateX(-100%);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-4);
  border-bottom: 1px solid var(--color-sidebar-border);
  flex-shrink: 0;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  min-width: 0;
}

.sidebar-logo {
  color: var(--color-primary);
  flex-shrink: 0;
}

.sidebar-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-sidebar-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar--collapsed .sidebar-title {
  display: none;
}

.sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--color-sidebar-text-muted);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
  background: var(--color-sidebar-item-hover);
  color: var(--color-sidebar-text);
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-3) var(--spacing-2);
}

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

.nav-item {
  margin-bottom: var(--spacing-1);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.nav-item--has-children {
  position: relative;
}

.nav-item--has-children > .nav-link {
  padding-right: var(--spacing-10);
}

.nav-link--collapsed {
  justify-content: center;
  padding-left: var(--spacing-3);
  padding-right: var(--spacing-3);
}

.nav-link--collapsed .nav-label {
  display: none;
}

.nav-link--collapsed .nav-chevron {
  display: none;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-3) var(--spacing-4);
  color: var(--color-sidebar-text);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
  min-height: 44px;
}

.nav-link:hover {
  background: var(--color-sidebar-item-hover);
  color: var(--color-sidebar-text);
  text-decoration: none;
}

.nav-item--active > .nav-link {
  background: var(--color-sidebar-item-active);
  color: var(--color-sidebar-item-active-text);
  font-weight: var(--font-weight-medium);
  box-shadow: inset 3px 0 0 var(--color-primary);
}

.nav-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-sidebar-text-muted);
}

.nav-item--active > .nav-link .nav-icon {
  color: var(--color-sidebar-item-active-text);
}

.nav-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: var(--font-size-sm);
}

.sidebar--collapsed .nav-label {
  display: none;
}

.nav-chevron {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  color: var(--color-sidebar-text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.nav-chevron.expanded {
  transform: rotate(90deg);
}

.sidebar--collapsed .nav-chevron {
  display: none;
}

.nav-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 var(--spacing-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  background: var(--color-primary);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.nav-sublist {
  list-style: none;
  margin: 0;
  padding: 0;
  padding-left: var(--spacing-10);
  border-left: 1px solid var(--color-border-light);
  margin-left: calc(var(--spacing-3) + 20px + var(--spacing-3));
}

.nav-item--nested .nav-link {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-sm);
}

.nav-item--nested .nav-icon {
  width: 16px;
  height: 16px;
}

.sidebar-footer {
  padding: var(--spacing-4);
  border-top: 1px solid var(--color-sidebar-border);
  flex-shrink: 0;
}

.sidebar-version {
  font-size: var(--font-size-xs);
  color: var(--color-sidebar-text-muted);
  text-align: center;
}

.sidebar-loading,
.sidebar-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-8);
  gap: var(--spacing-4);
  color: var(--color-sidebar-text-muted);
}

.sidebar-loading .spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border-light);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.sidebar-error svg {
  color: var(--color-danger);
}

.sidebar-error .btn {
  margin-top: var(--spacing-2);
}

.header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--spacing-6);
  background: var(--color-header-bg);
  border-bottom: 1px solid var(--color-header-border);
  position: sticky;
  top: 0;
  z-index: var(--z-index-sticky);
  gap: var(--spacing-6);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  flex: 0 0 auto;
}

.header-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  color: var(--color-header-text);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.header-menu-btn:hover {
  background: var(--color-bg-tertiary);
}

.header-title-area {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  min-width: 0;
}

.header-page-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-header-text);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

.breadcrumb-separator {
  color: var(--color-text-muted);
}

.breadcrumb-link {
  color: var(--color-text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-link:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.breadcrumb-current {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
}

.header-center {
  display: flex;
  align-items: center;
  flex: 1;
  max-width: 600px;
  justify-content: center;
}

.header-search {
  position: relative;
  width: 100%;
  max-width: 400px;
}

.header-search-icon {
  position: absolute;
  left: var(--spacing-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
}

.header-search-input {
  width: 100%;
  height: var(--input-height);
  padding: 0 var(--spacing-4) 0 calc(var(--spacing-4) + 20px + var(--spacing-2));
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-full);
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.header-search-input:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: var(--shadow-focus);
  background: var(--color-bg-primary);
}

.header-search-input::placeholder {
  color: var(--color-text-muted);
}

.header-search-clear {
  position: absolute;
  right: var(--spacing-3);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.header-search-clear:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  flex: 0 0 auto;
}

.header-notifications {
  position: relative;
  display: flex;
  align-items: center;
}

.header-bell-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.header-bell-btn:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.header-bell-badge {
  position: absolute;
  top: 2px;
  right: 2px;
  min-width: 16px;
  height: 16px;
  padding: 0 var(--spacing-1);
  border-radius: var(--radius-full);
  background: var(--color-danger);
  color: var(--color-white);
  font-size: 10px;
  font-weight: var(--font-weight-semibold);
  line-height: 16px;
  text-align: center;
}

.notification-panel {
  position: absolute;
  top: calc(100% + var(--spacing-2));
  right: 0;
  width: 340px;
  max-width: calc(100vw - var(--spacing-8));
  background: var(--color-modal-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-index-dropdown);
  overflow: hidden;
}

.notification-panel.hidden {
  display: none;
}

.notification-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-3);
  padding: var(--spacing-3);
  border-bottom: 1px solid var(--color-border-light);
}

.notification-panel-title {
  margin: 0;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.notification-panel-clear {
  border: none;
  background: transparent;
  color: var(--color-primary);
  font-size: var(--font-size-xs);
  cursor: pointer;
}

.notification-panel-clear:hover {
  text-decoration: underline;
}

.notification-panel-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  max-height: 60vh;
  padding: var(--spacing-2);
  overflow-y: auto;
}

.notification-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 100%;
  padding: var(--spacing-2) var(--spacing-3);
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  text-align: left;
  cursor: pointer;
}

.notification-item:hover {
  background: var(--color-bg-tertiary);
}

.notification-item--unread {
  box-shadow: inset 3px 0 0 var(--color-primary);
}

.notification-item--unread .notification-item-title {
  font-weight: var(--font-weight-semibold);
}

.notification-item-title {
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
}

.notification-item-message {
  display: -webkit-box;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.notification-item-time {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.header-user-menu {
  position: relative;
}

.header-user-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-2) var(--spacing-3);
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.header-user-btn:hover {
  background: var(--color-bg-tertiary);
}

.header-user-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  flex-shrink: 0;
}

.header-user-avatar-lg {
  width: 48px;
  height: 48px;
  font-size: var(--font-size-lg);
}

.header-user-info {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  min-width: 0;
}

.header-user-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-user-role {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  padding: 0 var(--spacing-2);
  border-radius: var(--radius-full);
  text-transform: capitalize;
}

.header-user-role.admin {
  background: var(--color-warning-light);
  color: var(--color-warning-hover);
}

.header-user-role.user {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.header-user-dropdown {
  position: absolute;
  top: calc(100% + var(--spacing-2));
  right: 0;
  min-width: 220px;
  padding: var(--spacing-2);
  background: var(--color-modal-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-index-dropdown);
}

.header-user-dropdown-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-2);
}

.header-user-dropdown-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.header-user-dropdown-email {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.dropdown-divider {
  margin: var(--spacing-2) 0;
  border: none;
  border-top: 1px solid var(--color-border-light);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  width: 100%;
  padding: var(--spacing-2) var(--spacing-3);
  border: none;
  background: transparent;
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-md);
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--color-bg-tertiary);
}

.dropdown-item--danger {
  color: var(--color-danger);
}

.dropdown-item--danger:hover {
  background: var(--color-danger-light);
}

.main-content {
  grid-area: main;
  padding: var(--spacing-6);
  overflow-y: auto;
  background: var(--color-bg-secondary);
  min-height: calc(100vh - var(--header-height));
  min-height: calc(100dvh - var(--header-height));
  scrollbar-gutter: stable;
}

.main-content-loading,
.main-content-error,
.main-content-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  padding: var(--spacing-8);
  text-align: center;
  gap: var(--spacing-4);
  color: var(--color-text-tertiary);
}

.main-content-loading .spinner {
  width: 32px;
  height: 32px;
}

.main-content-error svg {
  color: var(--color-danger);
}

.main-content-error h2 {
  margin: 0;
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
}

.main-content-error p {
  margin: 0;
  max-width: 400px;
}

.main-content-empty svg {
  color: var(--color-gray-300);
}

.main-content-empty h2 {
  margin: 0;
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
}

.main-content-empty p {
  margin: 0;
  max-width: 400px;
}

.mobile-sidebar-overlay {
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  z-index: var(--z-index-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

.mobile-sidebar-overlay.open {
  opacity: 1;
  visibility: visible;
}

.mobile-sidebar-drawer {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width-mobile);
  max-width: 100vw;
  background: var(--color-sidebar-bg);
  border-right: 1px solid var(--color-sidebar-border);
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform var(--transition-normal);
  box-shadow: var(--shadow-xl);
}

.mobile-sidebar-overlay.open .mobile-sidebar-drawer {
  transform: translateX(0);
}

.mobile-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-4);
  border-bottom: 1px solid var(--color-sidebar-border);
  flex-shrink: 0;
}

.mobile-sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.mobile-sidebar-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  color: var(--color-sidebar-text);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-sidebar-close:hover {
  background: var(--color-sidebar-item-hover);
}

.mobile-sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-3) var(--spacing-2);
  -webkit-overflow-scrolling: touch;
}

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

.mobile-nav-item {
  margin-bottom: var(--spacing-1);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  min-height: 44px;
  padding: var(--spacing-3) var(--spacing-4);
  color: var(--color-sidebar-text);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  touch-action: manipulation;
}

.mobile-nav-link:hover {
  background: var(--color-sidebar-item-hover);
  color: var(--color-sidebar-text);
  text-decoration: none;
}

.mobile-nav-item--active > .mobile-nav-link {
  background: var(--color-sidebar-item-active);
  color: var(--color-sidebar-item-active-text);
  font-weight: var(--font-weight-medium);
}

.mobile-nav-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-sidebar-text-muted);
}

.mobile-nav-item--active > .mobile-nav-link .mobile-nav-icon {
  color: var(--color-sidebar-item-active-text);
}

.mobile-nav-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: var(--font-size-sm);
}

.mobile-nav-chevron {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  color: var(--color-sidebar-text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.mobile-nav-chevron.expanded {
  transform: rotate(90deg);
}

.mobile-nav-sublist {
  list-style: none;
  margin: 0;
  padding: 0;
  padding-left: var(--spacing-10);
  border-left: 1px solid var(--color-border-light);
  margin-left: calc(var(--spacing-3) + 20px + var(--spacing-3));
}

.mobile-nav-item--nested .mobile-nav-link {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-sm);
}

.mobile-nav-item--nested .mobile-nav-icon {
  width: 16px;
  height: 16px;
}

.mobile-sidebar-footer {
  padding: var(--spacing-4);
  border-top: 1px solid var(--color-sidebar-border);
  flex-shrink: 0;
}

.mobile-sidebar-version {
  font-size: var(--font-size-xs);
  color: var(--color-sidebar-text-muted);
  text-align: center;
}

.module-placeholder {
  padding: var(--spacing-4);
  max-width: 900px;
  margin: 0 auto;
}

.module-placeholder-card {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.module-placeholder-header {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-6);
  padding: var(--spacing-8);
  border-bottom: 1px solid var(--color-border-light);
  background: var(--color-bg-secondary);
}

.module-placeholder-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-light);
  color: var(--color-primary);
  flex-shrink: 0;
}

.module-placeholder-title-area {
  flex: 1;
  min-width: 0;
}

.module-placeholder-name {
  margin: 0 0 var(--spacing-2);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.module-placeholder-description {
  margin: 0;
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.module-placeholder-body {
  padding: var(--spacing-8);
}

.module-placeholder-status {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--spacing-8);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-6);
}

.module-placeholder-status svg {
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
}

.module-placeholder-status h2 {
  margin: 0 0 var(--spacing-2);
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
}

.module-placeholder-status p {
  margin: 0;
  color: var(--color-text-secondary);
}

.module-placeholder-features {
  list-style: none;
  margin: 0 0 var(--spacing-6);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-3);
}

.module-placeholder-features li {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-3) var(--spacing-4);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.module-placeholder-features li:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.module-placeholder-features svg {
  color: var(--color-success);
  flex-shrink: 0;
}

.module-placeholder-actions {
  display: flex;
  justify-content: center;
  padding-top: var(--spacing-6);
  border-top: 1px solid var(--color-border-light);
}

/* Tablet and below (including iPad landscape) */
@media (max-width: 1199px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-rows: var(--header-height) 1fr;
    grid-template-areas:
      "header"
      "main";
  }

  .sidebar {
    display: none;
    grid-area: auto;
  }

  .header-menu-btn {
    display: flex !important;
  }

  .header-center {
    max-width: none;
    flex: 1;
  }
}

/* Mobile (< md: 768px) */
@media (max-width: 767px) {
  .header {
    padding: 0 var(--spacing-4);
    gap: var(--spacing-4);
  }

  .header-page-title {
    font-size: var(--font-size-lg);
  }

  .header-breadcrumbs {
    display: none;
  }

  .header-user-info {
    display: none;
  }

  .main-content {
    padding: var(--spacing-4);
  }
}

/* Small mobile (< sm: 640px) */
@media (max-width: 639px) {
  .header {
    padding: 0 var(--spacing-3);
    gap: var(--spacing-3);
  }

  .header-page-title {
    font-size: var(--font-size-base);
  }

  .header-menu-btn {
    width: 36px;
    height: 36px;
  }

  .header-search {
    max-width: none;
  }

  .header-search-input {
    font-size: var(--font-size-base);
    padding-left: calc(var(--spacing-4) + 20px + var(--spacing-2));
  }

  .main-content {
    padding: var(--spacing-3);
  }

  .module-placeholder-header {
    padding: var(--spacing-5);
  }

  .module-placeholder-icon {
    width: 56px;
    height: 56px;
  }

  .module-placeholder-name {
    font-size: var(--font-size-xl);
  }

  .module-placeholder-body {
    padding: var(--spacing-5);
  }

  .module-placeholder-status {
    padding: var(--spacing-5);
  }

  .module-placeholder-features {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sidebar,
  .nav-link,
  .header-menu-btn,
  .header-search-input,
  .header-user-btn,
  .dropdown-item,
  .mobile-sidebar-overlay,
  .mobile-sidebar-drawer,
  .mobile-nav-link {
    transition: none !important;
    animation: none !important;
  }
}