/* ==========================================================================
   PensionPal SaaS Design System
   Based on 11-UI-UX-DESIGN-SYSTEM.md specification
   ========================================================================== */

/* --- CSS Custom Properties (Design Tokens) --- */

:root {
  /* Primary Palette */
  --color-primary-900: #0D1F3C;
  --color-primary-800: #13294A;
  --color-primary-700: #1B3A64;
  --color-primary-600: #24507E;
  --color-primary-500: #4682B4;
  --color-primary-400: #6A9CC8;
  --color-primary-300: #93B8D9;
  --color-primary-200: #BDD4EA;
  --color-primary-100: #E3EDF6;
  --color-primary-50: #F2F7FB;

  /* Neutral Palette */
  --color-neutral-900: #1A1D21;
  --color-neutral-800: #2D3239;
  --color-neutral-700: #434A54;
  --color-neutral-600: #5E6672;
  --color-neutral-500: #708090;
  --color-neutral-400: #9BA4AE;
  --color-neutral-300: #C1C7CE;
  --color-neutral-200: #DDE1E6;
  --color-neutral-100: #EEEEF1;
  --color-neutral-50: #F7F8FA;
  --color-neutral-0: #FFFFFF;

  /* Semantic Colors */
  --color-success-600: #15803D;
  --color-success-100: #DCFCE7;
  --color-warning-600: #A16207;
  --color-warning-100: #FEF9C3;
  --color-danger-600: #B91C1C;
  --color-danger-100: #FEE2E2;
  --color-info-600: #1D4ED8;
  --color-info-100: #DBEAFE;

  /* Surface Colors */
  --surface-page: #F2F7FB;
  --surface-card: #FFFFFF;
  --surface-sidebar: #0D1F3C;
  --surface-topbar: #FFFFFF;
  --surface-table-header: #E3EDF6;
  --surface-table-alt: #F7F8FA;
  --surface-selected: #BDD4EA;
  --surface-overlay: rgba(13, 31, 60, 0.5);

  /* Typography */
  --font-family-primary: 'Inter', 'Tahoma', 'Segoe UI', -apple-system, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Cascadia Code', 'Consolas', monospace;

  --text-xs: 0.6875rem;
  --text-sm: 0.75rem;
  --text-base: 0.8125rem;
  --text-md: 0.875rem;
  --text-lg: 1rem;
  --text-xl: 1.125rem;
  --text-2xl: 1.375rem;
  --text-3xl: 1.75rem;

  --leading-xs: 16px;
  --leading-sm: 18px;
  --leading-base: 20px;
  --leading-md: 22px;
  --leading-lg: 24px;
  --leading-xl: 28px;
  --leading-2xl: 30px;
  --leading-3xl: 36px;

  --weight-normal: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* Spacing (4px base grid) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  /* Borders & Radii */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-pill: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.12);

  /* Layout dimensions */
  --sidebar-width: 240px;
  --sidebar-collapsed-width: 64px;
  --topbar-height: 48px;
  --statusbar-height: 28px;
  --toolbar-height: 44px;
  --breadcrumb-height: 32px;

  /* Density: comfortable (default) */
  --row-height: 36px;
  --input-height: 36px;
  --btn-height: 36px;

  /* DevExpress Blazor theme overrides */
  --dxbl-accent-color: #4682B4;
  --dxbl-accent-color-hover: #24507E;
  --dxbl-selection-color: #BDD4EA;
  --dxbl-text-color: #1A1D21;
  --dxbl-secondary-text-color: #5E6672;
  --dxbl-border-color: #DDE1E6;
  --dxbl-bg-color: #FFFFFF;
  --dxbl-secondary-bg-color: #F7F8FA;
  --dxbl-font-family: 'Inter', 'Tahoma', 'Segoe UI', sans-serif;
  --dxbl-font-size: 13px;
}

/* --- Density: Compact Mode --- */

.density-compact {
  --row-height: 28px;
  --input-height: 30px;
  --btn-height: 30px;
}

/* --- Base Reset & Globals --- */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--text-base);
  line-height: var(--leading-base);
  color: var(--color-neutral-900);
  background-color: var(--surface-page);
  overflow: hidden;
}

/* --- Application Shell --- */

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: 1fr;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  transition: grid-template-columns 0.2s ease;
}

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

/* --- Sidebar --- */

.sidebar {
  background: var(--surface-sidebar);
  color: rgba(255, 255, 255, 0.9);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  height: 56px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  flex-shrink: 0;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--color-primary-500);
  color: #FFFFFF;
  border-radius: var(--radius-md);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  flex-shrink: 0;
}

.logo-text {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  white-space: nowrap;
}

.sidebar-collapsed .logo-text {
  display: none;
}

/* Sidebar Navigation */

.sidebar-nav {
  flex: 1;
  padding: var(--space-2) 0;
  overflow-y: auto;
}

.nav-section {
  margin-bottom: var(--space-2);
}

.nav-section-label {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.5);
  text-transform: uppercase;
  white-space: nowrap;
}

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

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  font-size: var(--text-base);
  font-weight: var(--weight-normal);
  transition: background-color 0.15s ease, border-left 0.15s ease;
  border-left: 3px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}

.nav-item:hover {
  background: var(--color-primary-800);
  color: #FFFFFF;
}

.nav-item.active {
  background: var(--color-primary-800);
  border-left-color: var(--color-primary-500);
  color: #FFFFFF;
}

.nav-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  font-size: 10px;
}

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

/* Sidebar Collapse Toggle */

.sidebar-collapse-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: none;
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--text-sm);
  cursor: pointer;
  flex-shrink: 0;
  width: 100%;
  text-align: left;
}

.sidebar-collapse-toggle:hover {
  color: #FFFFFF;
  background: var(--color-primary-800);
}

.sidebar-collapsed .sidebar-collapse-toggle .nav-text {
  display: none;
}

/* --- Main Area (Top Bar + Content + Status Bar) --- */

.main-area {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* --- Top Bar --- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--topbar-height);
  padding: 0 var(--space-6);
  background: var(--surface-topbar);
  border-bottom: 1px solid var(--color-neutral-200);
  flex-shrink: 0;
}

.topbar-search {
  flex: 1;
  max-width: 480px;
}

.topbar-search-input {
  width: 100%;
  height: 32px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  font-family: var(--font-family-primary);
  font-size: var(--text-sm);
  color: var(--color-neutral-900);
  background: var(--color-neutral-50);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.topbar-search-input:focus {
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 2px rgba(70, 130, 180, 0.2);
  background: var(--color-neutral-0);
}

.topbar-search-input::placeholder {
  color: var(--color-neutral-500);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.topbar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-neutral-600);
  font-size: var(--text-md);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.topbar-btn:hover {
  background: var(--color-neutral-100);
  color: var(--color-neutral-800);
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.topbar-user:hover {
  background: var(--color-neutral-100);
}

.user-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--color-primary-500);
  color: #FFFFFF;
  border-radius: 50%;
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
}

.user-name {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-neutral-700);
}

/* --- Content Area --- */

.content-area {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6);
  background: var(--surface-page);
}

/* --- Status Bar --- */

.statusbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--statusbar-height);
  padding: 0 var(--space-4);
  background: var(--color-neutral-100);
  border-top: 1px solid var(--color-neutral-200);
  font-size: var(--text-xs);
  color: var(--color-neutral-600);
  flex-shrink: 0;
}

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

/* --- Utility Classes --- */

/* Typography */
.text-xs { font-size: var(--text-xs); line-height: var(--leading-xs); }
.text-sm { font-size: var(--text-sm); line-height: var(--leading-sm); }
.text-base { font-size: var(--text-base); line-height: var(--leading-base); }
.text-md { font-size: var(--text-md); line-height: var(--leading-md); font-weight: var(--weight-medium); }
.text-lg { font-size: var(--text-lg); line-height: var(--leading-lg); font-weight: var(--weight-semibold); }
.text-xl { font-size: var(--text-xl); line-height: var(--leading-xl); font-weight: var(--weight-semibold); }
.text-2xl { font-size: var(--text-2xl); line-height: var(--leading-2xl); font-weight: var(--weight-bold); }
.text-3xl { font-size: var(--text-3xl); line-height: var(--leading-3xl); font-weight: var(--weight-bold); }
.font-mono { font-family: var(--font-family-mono); }

/* Financial / numeric formatting */
.financial-value {
  font-variant-numeric: tabular-nums lining-nums;
  font-feature-settings: "tnum" 1;
  text-align: right;
  font-family: var(--font-family-mono);
}

.financial-negative {
  color: var(--color-danger-600);
}

/* Status Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  white-space: nowrap;
}

.badge-active { background: var(--color-success-100); color: var(--color-success-600); }
.badge-pending { background: var(--color-warning-100); color: var(--color-warning-600); }
.badge-overdue { background: var(--color-danger-100); color: var(--color-danger-600); }
.badge-completed { background: var(--color-primary-100); color: var(--color-primary-700); }
.badge-draft { background: var(--color-neutral-100); color: var(--color-neutral-600); }
.badge-inactive { background: var(--color-neutral-100); color: var(--color-neutral-500); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: var(--btn-height);
  padding: 0 var(--space-3);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-family-primary);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  cursor: pointer;
  transition: background-color 0.15s ease, box-shadow 0.15s ease;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-primary-700);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: var(--color-primary-600);
}

.btn-secondary {
  background: #FFFFFF;
  color: var(--color-primary-700);
  border: 1px solid var(--color-primary-500);
}

.btn-secondary:hover {
  background: var(--color-primary-50);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary-500);
}

.btn-ghost:hover {
  background: var(--color-primary-50);
}

.btn-danger {
  background: var(--color-danger-600);
  color: #FFFFFF;
}

.btn-danger:hover {
  background: #991B1B;
}

.btn:disabled {
  background: var(--color-neutral-200);
  color: var(--color-neutral-500);
  cursor: not-allowed;
}

/* Cards */
.card {
  background: var(--surface-card);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-4);
}

.card-header {
  font-size: var(--text-md);
  font-weight: var(--weight-semibold);
  color: var(--color-neutral-800);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-neutral-200);
  margin-bottom: var(--space-3);
}

/* Form Controls */
.form-label {
  display: block;
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-neutral-700);
  margin-bottom: var(--space-1);
}

.form-label .required {
  color: var(--color-danger-600);
}

.form-input {
  width: 100%;
  height: var(--input-height);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-neutral-400);
  border-radius: var(--radius-md);
  font-family: var(--font-family-primary);
  font-size: var(--text-base);
  color: var(--color-neutral-900);
  background: var(--color-neutral-0);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus {
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 2px rgba(70, 130, 180, 0.15);
}

.form-input.is-error {
  border-color: var(--color-danger-600);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--color-danger-600);
  margin-top: var(--space-1);
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: var(--toolbar-height);
  padding: 0 var(--space-4);
  background: var(--surface-card);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
}

.toolbar-separator {
  width: 1px;
  height: 24px;
  background: var(--color-neutral-200);
  margin: 0 var(--space-2);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: var(--breadcrumb-height);
  font-size: var(--text-sm);
  color: var(--color-neutral-600);
}

.breadcrumb a {
  color: var(--color-primary-500);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb-separator {
  color: var(--color-neutral-400);
}

/* Tabs */
.tab-bar {
  display: flex;
  border-bottom: 1px solid var(--color-neutral-200);
  overflow-x: auto;
}

.tab-item {
  display: flex;
  align-items: center;
  height: 40px;
  padding: 0 var(--space-4);
  font-size: var(--text-base);
  color: var(--color-neutral-600);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.tab-item:hover {
  color: var(--color-neutral-800);
  background: var(--color-neutral-50);
}

.tab-item.active {
  color: var(--color-primary-700);
  border-bottom-color: var(--color-primary-700);
  font-weight: var(--weight-medium);
}

.tab-item:disabled {
  color: var(--color-neutral-400);
  cursor: not-allowed;
}

/* Density: Comfortable (default) */
.density-comfortable {
  --row-height: 36px;
  --input-height: 36px;
  --btn-height: 36px;
}

/* Density: Compact */
.density-compact {
  --row-height: 28px;
  --input-height: 30px;
  --btn-height: 30px;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-neutral-300);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-neutral-400);
}

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* Selection */
::selection {
  background: var(--surface-selected);
  color: var(--color-neutral-900);
}