/* ============================================================
   Expense Tracker - Responsive CSS Framework (Mobile-First)
   ============================================================ */

/* CSS Custom Properties */
:root {
  /* Colors */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-success: #16a34a;
  --color-success-light: #dcfce7;
  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;
  --color-error: #dc2626;
  --color-error-light: #fee2e2;
  --color-info: #0891b2;
  --color-info-light: #cffafe;

  /* Neutral */
  --color-bg: #f5f5f5;
  --color-surface: #ffffff;
  --color-surface-hover: #f9fafb;
  --color-border: #e5e7eb;
  --color-border-strong: #d1d5db;
  --color-text: #1f2937;
  --color-text-secondary: #6b7280;
  --color-text-muted: #9ca3af;
  --color-text-inverse: #ffffff;

  /* Spacing (fluid) */
  --space-xs: clamp(0.25rem, 0.5vw, 0.5rem);
  --space-sm: clamp(0.5rem, 1vw, 0.75rem);
  --space-md: clamp(0.75rem, 1.5vw, 1rem);
  --space-lg: clamp(1rem, 2vw, 1.5rem);
  --space-xl: clamp(1.5rem, 3vw, 2rem);
  --space-2xl: clamp(2rem, 4vw, 3rem);

  /* Typography (fluid) */
  --text-xs: clamp(0.7rem, 0.8vw, 0.75rem);
  --text-sm: clamp(0.8rem, 1vw, 0.875rem);
  --text-base: clamp(0.9rem, 1.2vw, 1rem);
  --text-lg: clamp(1.05rem, 1.4vw, 1.125rem);
  --text-xl: clamp(1.2rem, 1.8vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 2.5vw, 2rem);
  --text-3xl: clamp(1.875rem, 3vw, 2.5rem);

  font-size: var(--text-base);
  line-height: 1.6;

  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 10px 10px -5px rgb(0 0 0 / 0.04);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal-backdrop: 300;
  --z-modal: 400;
  --z-toast: 500;

  /* Layout */
  --header-height: 56px;
  --sidebar-width: 260px;
  --sidebar-collapsed-width: 64px;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #111827;
    --color-surface: #1f2937;
    --color-surface-hover: #374151;
    --color-border: #374151;
    --color-border-strong: #4b5563;
    --color-text: #f9fafb;
    --color-text-secondary: #d1d5db;
    --color-text-muted: #9ca3af;
    --color-primary-light: #1e3a5f;
    --color-success-light: #064e3b;
    --color-warning-light: #78350f;
    --color-error-light: #7f1d1d;
  }
}

[data-theme="light"] {
  --color-bg: #f5f5f5;
  --color-surface: #ffffff;
  --color-surface-hover: #f9fafb;
  --color-border: #e5e7eb;
  --color-border-strong: #d1d5db;
  --color-text: #1f2937;
  --color-text-secondary: #6b7280;
  --color-text-muted: #9ca3af;
  --color-primary-light: #dbeafe;
  --color-success-light: #dcfce7;
  --color-warning-light: #fef3c7;
  --color-error-light: #fee2e2;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  overflow-x: hidden;
}

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

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  z-index: var(--z-toast);
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: var(--space-md);
}

/* ============================================================
   Layout: App Shell
   ============================================================ */

.app-shell {
  display: grid;
  grid-template-rows: var(--header-height) 1fr;
  grid-template-columns: 1fr;
  min-height: 100vh;
}

@media (min-width: 768px) {
  .app-shell {
    grid-template-columns: var(--sidebar-width) 1fr;
  }
  
  .app-shell.sidebar-collapsed {
    grid-template-columns: var(--sidebar-collapsed-width) 1fr;
  }
}

/* ============================================================
   Header
   ============================================================ */

.header {
  position: relative;
  z-index: var(--z-sticky);
  height: var(--header-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-md);
  gap: var(--space-md);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

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

.menu-toggle:hover {
  background-color: var(--color-surface-hover);
}

.menu-toggle svg {
  width: 24px;
  height: 24px;
}

@media (min-width: 768px) {
  .menu-toggle {
    display: none;
  }
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--color-text);
  font-weight: 700;
  font-size: var(--text-lg);
  white-space: nowrap;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
}

.brand-icon svg {
  width: 20px;
  height: 20px;
}

@media (max-width: 480px) {
  .brand-text {
    display: none;
  }
}

/* Header actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.icon-btn:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-text);
}

.icon-btn svg {
  width: 22px;
  height: 22px;
}

.icon-btn.primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

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

.user-menu {
  position: relative;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: var(--text-sm);
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color var(--transition-fast);
}

.user-avatar:hover {
  border-color: var(--color-primary);
}

/* ============================================================
   Sidebar
   ============================================================ */

.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  transform: translateX(-100%);
  transition: transform var(--transition-base);
  z-index: var(--z-sticky);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

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

@media (min-width: 768px) {
  .sidebar {
    position: static;
    top: auto;
    bottom: auto;
    transform: translateX(0);
    height: 100%;
    border-right: 1px solid var(--color-border);
    grid-column: 1;
    grid-row: 2;
  }
  
  .app-shell.sidebar-collapsed .sidebar {
    width: var(--sidebar-collapsed-width);
  }
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: calc(var(--z-sticky) - 1);
}

.sidebar-overlay.visible {
  display: block;
}

@media (min-width: 768px) {
  .sidebar-overlay {
    display: none !important;
  }
}

.sidebar-nav {
  padding: var(--space-md) var(--space-sm);
}

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

.nav-section-title {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (min-width: 768px) {
  .app-shell.sidebar-collapsed .nav-section-title {
    display: none;
  }
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: none;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.nav-item:hover,
.nav-item.active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.nav-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.nav-item-badge {
  margin-left: auto;
  padding: 2px 6px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
}

@media (min-width: 768px) {
  .app-shell.sidebar-collapsed .nav-item {
    justify-content: center;
    padding: var(--space-sm);
  }
  
  .app-shell.sidebar-collapsed .nav-item-text,
  .app-shell.sidebar-collapsed .nav-item-badge {
    display: none;
  }
}

/* ============================================================
   Main Content
   ============================================================ */

.main {
  grid-column: 1 / -1;
  grid-row: 2;
  padding: var(--space-md);
  overflow-y: auto;
}

@media (min-width: 768px) {
  .main {
    grid-column: 2;
    padding: var(--space-lg) var(--space-xl);
  }
}

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.page-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}

.page-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
}

.page-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* ============================================================
   Dashboard Grid Layouts
   ============================================================ */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  align-items: stretch;
}

.stats-grid > .card {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.stats-grid .card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.charts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

@media (min-width: 768px) {
  .charts-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .charts-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.chart-card {
  min-height: 280px;
  max-height: 320px;
}

.chart-card .card-body {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.chart-card canvas {
  flex: 1;
  width: 100% !important;
  height: 100% !important;
}

  flex: 1;
  display: flex;
  flex-direction: column;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.card-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
}

.card-body {
  padding: var(--space-lg);
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-hover);
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  min-height: 44px;
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.5;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-surface-hover);
  border-color: var(--color-border-strong);
}

.btn-danger {
  background: var(--color-error);
  color: var(--color-text-inverse);
  border-color: var(--color-error);
}

.btn-danger:hover:not(:disabled) {
  background: #b91c1c;
  border-color: #b91c1c;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.btn-sm {
  padding: var(--space-xs) var(--space-md);
  min-height: 36px;
  font-size: var(--text-xs);
}

.btn-lg {
  padding: var(--space-md) var(--space-xl);
  min-height: 48px;
  font-size: var(--text-base);
}

.btn-block {
  width: 100%;
}

.btn-icon {
  padding: var(--space-sm);
  min-width: 44px;
}

/* ============================================================
   Forms
   ============================================================ */

.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  margin-bottom: var(--space-xs);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  min-height: 44px;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-base);
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--color-error);
}

.form-input.error:focus,
.form-select.error:focus,
.form-textarea.error:focus {
  box-shadow: 0 0 0 3px var(--color-error-light);
}

.form-error {
  display: none;
  margin-top: var(--space-xs);
  font-size: var(--text-xs);
  color: var(--color-error);
}

.form-error.visible {
  display: block;
}

.form-textarea {
  min-height: 100px;
  resize: vertical;
}

.form-row {
  display: grid;
  gap: var(--space-md);
}

@media (min-width: 480px) {
  .form-row-2 { grid-template-columns: repeat(2, 1fr); }
  .form-row-3 { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 768px) {
  .form-row-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
}

.form-check-input {
  width: 20px;
  height: 20px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.form-check-label {
  font-size: var(--text-sm);
  color: var(--color-text);
  cursor: pointer;
}

/* Switch Toggle */
.form-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

.form-switch-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.form-switch-track {
  width: 44px;
  height: 26px;
  background: var(--color-border-strong);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast);
  position: relative;
}

.form-switch-track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 22px;
  height: 22px;
  background: white;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast);
}

.form-switch-input:checked + .form-switch-track {
  background: var(--color-primary);
}

.form-switch-input:checked + .form-switch-track::after {
  transform: translateX(18px);
}

.form-switch-input:focus-visible + .form-switch-track {
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-switch-label {
  font-size: var(--text-sm);
  color: var(--color-text);
  cursor: pointer;
}

/* ============================================================
   Tables (Desktop) / Cards (Mobile)
   ============================================================ */

.table-container {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.table th,
.table td {
  padding: var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.table th {
  background: var(--color-surface-hover);
  font-weight: 600;
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
  position: sticky;
  top: 0;
  z-index: 1;
}

.table tbody tr {
  transition: background-color var(--transition-fast);
}

.table tbody tr:hover {
  background: var(--color-surface-hover);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

/* Mobile card view */
.card-list {
  display: none;
  flex-direction: column;
  gap: var(--space-sm);
}

@media (max-width: 767px) {
  .table-container .table {
    display: none;
  }
  .table-container .card-list {
    display: flex;
  }
}

.txn-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}

.txn-card.swiped-left {
  transform: translateX(-80px);
}

.txn-card-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-xs);
}

.txn-card-amount {
  font-size: var(--text-lg);
  font-weight: 700;
  white-space: nowrap;
}

.txn-card-amount.positive { color: var(--color-success); }
.txn-card-amount.negative { color: var(--color-error); }

.txn-card-merchant {
  font-weight: 500;
  color: var(--color-text);
  flex: 1;
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.txn-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

.txn-card-meta span {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.txn-card-category {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
}

.txn-card-actions {
  display: flex;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
}

/* ============================================================
   Modals
   ============================================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  transform: scale(0.95);
  transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

@media (max-width: 480px) {
  .modal {
    max-height: 85vh;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    margin: 0;
    transform: translateY(100%);
  }
  .modal-overlay.active .modal {
    transform: translateY(0);
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
}

.modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.modal-close:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.modal-close svg {
  width: 24px;
  height: 24px;
}

.modal-body {
  padding: var(--space-lg);
  overflow-y: auto;
  max-height: calc(90vh - 140px);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-hover);
}

/* ============================================================
   Dropdown
   ============================================================ */

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 200px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-xs);
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
}

.dropdown-menu.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

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

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

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

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

.dropdown-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-xs) 0;
}

/* ============================================================
   Badges & Tags
   ============================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-primary { background: var(--color-primary-light); color: var(--color-primary); }
.badge-success { background: var(--color-success-light); color: var(--color-success); }
.badge-warning { background: var(--color-warning-light); color: #b45309; }
.badge-error { background: var(--color-error-light); color: var(--color-error); }
.badge-info { background: var(--color-info-light); color: var(--color-info); }
.badge-neutral { background: var(--color-border); color: var(--color-text-secondary); }

/* ============================================================
   Empty State
   ============================================================ */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-md);
  text-align: center;
  color: var(--color-text-muted);
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-md);
  color: var(--color-text-muted);
  opacity: 0.5;
}

.empty-state-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.empty-state-text {
  font-size: var(--text-sm);
  max-width: 280px;
  margin-bottom: var(--space-lg);
}

/* ============================================================
   Loading & Skeleton
   ============================================================ */

.skeleton {
  background: linear-gradient(90deg, var(--color-border) 25%, var(--color-border-strong) 50%, var(--color-border) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================================
   Toasts
   ============================================================ */

.toast-container {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  z-index: var(--z-toast);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: slideIn var(--transition-base);
  max-width: 360px;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(100%); }
  to { opacity: 1; transform: translateX(0); }
}

.toast.success { border-left: 4px solid var(--color-success); }
.toast.error { border-left: 4px solid var(--color-error); }
.toast.warning { border-left: 4px solid var(--color-warning); }
.toast.info { border-left: 4px solid var(--color-info); }

.toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.toast-message {
  flex: 1;
  font-size: var(--text-sm);
  color: var(--color-text);
}

.toast-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.toast-close:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

/* ============================================================
   Utility Classes
   ============================================================ */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-error { color: var(--color-error); }
.text-warning { color: var(--color-warning); }

.fw-bold { font-weight: 700; }
.fw-semibold { font-weight: 600; }
.fw-medium { font-weight: 500; }

.d-flex { display: flex; }
.d-none { display: none; }
.d-block { display: block; }
.flex-1 { flex: 1; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

.w-full { width: 100%; }

@media (max-width: 480px) {
  .mobile-hidden { display: none !important; }
  .mobile-block { display: block !important; }
  .mobile-flex { display: flex !important; }
}

@media (min-width: 768px) {
  .desktop-hidden { display: none !important; }
}