.app-shell {
  height: 100vh;
  display: flex;
  overflow: hidden;
  background: var(--color-bg);
}

html.sidebar-collapsed-initial,
body.sidebar-collapsed,
.app-shell.sidebar-collapsed {
  --sidebar-width: 64px;
}

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  height: 100vh;
  overflow: hidden;
  background: var(--color-surface);
  color: var(--color-text-secondary);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
}

.app-shell.sidebar-ready .sidebar {
  transition: width 0.18s ease;
  will-change: width;
}

.sidebar-brand {
  height: var(--header-height);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.sidebar-brand-icon {
  display: none;
  width: 32px;
  height: 32px;
  place-items: center;
  color: var(--color-primary);
  font-size: 20px;
}

.brand-title {
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
  white-space: nowrap;
}

.sidebar-scroll {
  min-height: 0;
  flex: 1;
  overflow: auto;
  padding: var(--space-3);
  overflow-x: hidden;
}

.sidebar-section {
  padding: var(--space-2) 0;
}

.sidebar-section-title {
  padding: 0 var(--space-2) var(--space-2);
  color: var(--color-text-placeholder);
  font-size: var(--font-size-xs);
  font-weight: 700;
}

.sidebar-link {
  width: 100%;
  min-height: 36px;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0 var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  margin-bottom: var(--space-1);
  border: 1px solid transparent;
}

.sidebar-menu-icon {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  display: inline-grid;
  place-items: center;
  font-size: 18px;
  line-height: 1;
}

.sidebar-link-text {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-link:hover {
  background: var(--color-surface-subtle);
  color: var(--color-text);
}

.sidebar-link.active {
  background: var(--color-primary-soft);
  border-color: #bfdbfe;
  color: var(--color-primary);
  font-weight: 700;
}

.sidebar-collapsed .sidebar-brand {
  justify-content: center;
  padding: 0;
}

.sidebar-collapsed .sidebar-brand-icon {
  display: grid;
}

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

.sidebar-collapsed .sidebar-scroll {
  padding: var(--space-3) var(--space-2);
}

.sidebar-collapsed .sidebar-section {
  padding: var(--space-1) 0;
}

.sidebar-collapsed .sidebar-section-title,
.sidebar-collapsed .sidebar-link-text {
  display: none;
}

.sidebar-collapsed .sidebar-link {
  justify-content: center;
  padding: 0;
}

.sidebar-collapsed .sidebar-menu-icon {
  width: 20px;
  height: 20px;
  flex-basis: 20px;
  font-size: 20px;
}

.app-main {
  flex: 1;
  min-width: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.app-header {
  height: var(--header-height);
  flex-shrink: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-2);
  padding: 0 var(--space-5);
  backdrop-filter: blur(10px);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.header-right {
  margin-left: auto;
}

.header-title {
  font-weight: 700;
  white-space: nowrap;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-sidebar-toggle {
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}

.header-sidebar-toggle:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.header-sidebar-toggle:focus-visible {
  outline: 2px solid rgba(37, 99, 235, 0.24);
  outline-offset: 2px;
}

.header-sidebar-toggle i {
  width: 18px;
  height: 18px;
  display: inline-grid;
  place-items: center;
  font-size: 18px;
  line-height: 1;
}

.ri-dashboard-line::before { content: "▦"; }
.ri-user-settings-line::before { content: "◉"; }
.ri-file-search-line::before { content: "⌕"; }
.ri-settings-3-line::before { content: "⚙"; }
.ri-account-circle-line::before { content: "◎"; }
.ri-pages-line::before { content: "▤"; }
.ri-calendar-check-line::before { content: "✓"; }
.ri-file-list-3-line::before { content: "☷"; }
.ri-circle-line::before { content: "○"; }
.ri-message-3-line::before { content: "✉"; }
.ri-menu-fold-line,
.ri-menu-unfold-line {
  position: relative;
}

.ri-menu-fold-line::before,
.ri-menu-unfold-line::before {
  content: "";
  width: 15px;
  height: 12px;
  border-top: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  background: linear-gradient(currentColor, currentColor) 0 50% / 15px 2px no-repeat;
}

.ri-menu-fold-line::after,
.ri-menu-unfold-line::after {
  content: "";
  position: absolute;
  top: 5px;
  width: 5px;
  height: 5px;
  border-top: 1.8px solid currentColor;
  border-right: 1.8px solid currentColor;
}

.ri-menu-fold-line::after {
  left: 1px;
  transform: rotate(225deg);
}

.ri-menu-unfold-line::after {
  right: 1px;
  transform: rotate(45deg);
}

.app-content {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: var(--space-4);
}

.page-head {
  min-height: 38px;
  flex-shrink: 0;
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  align-items: center;
  margin-bottom: var(--space-3);
}

.page-head-hidden {
  display: none;
}

.breadcrumb {
  display: none;
}

.page-title {
  margin: 0;
  font-size: var(--font-size-lg);
  line-height: 1.2;
  font-weight: 700;
}

.page-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.app-view {
  flex: 1;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

.page-layout {
  height: 100%;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: var(--content-gap);
  overflow: hidden;
}

.page-toolbar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.page-tabs {
  flex-shrink: 0;
}

.page-empty {
  min-height: 220px;
  display: grid;
  place-items: center;
  color: var(--color-text-muted);
}

.login-page {
  overflow: auto;
  background: var(--color-bg);
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: var(--space-6);
}

.login-panel {
  width: min(420px, 100%);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 28px;
}

.login-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.login-brand h1 {
  margin: 0;
  font-size: 20px;
}

.login-brand p,
.login-note {
  margin: 4px 0 0;
  color: var(--color-text-muted);
}

.login-note {
  font-size: var(--font-size-xs);
  margin-top: 14px;
}