/* =============================================================================
   REUSABLE THEME SYSTEM
   This file contains all the visual styling that can be used across Flask apps
   ============================================================================= */

/* CSS Custom Properties */
:root {
  /* Primary Colors */
  --color-primary-blue: #0b8793;
  --color-primary-purple: #360033;
  --color-primary-teal: #009DA0;
  
  /* Semantic Colors */
  --color-success: #10B981;
  --color-warning: #FF8D60;
  --color-danger: #FF586B;
  --color-info: #3B82F6;
  
  /* Neutral Colors */
  --color-neutral-white: #FFFFFF;
  --color-neutral-gray-50: #F9FAFB;
  --color-neutral-gray-100: #F3F4F6;
  --color-neutral-gray-200: #E5E7EB;
  --color-neutral-gray-300: #D1D5DB;
  --color-neutral-gray-400: #9CA3AF;
  --color-neutral-gray-500: #6B7280;
  --color-neutral-gray-600: #4B5563;
  --color-neutral-gray-700: #374151;
  --color-neutral-gray-800: #1F2937;
  --color-neutral-gray-900: #111827;
  --color-neutral-black: #000000;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Typography */
  --font-sans: ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-sidebar: 4px 0 12px -2px rgba(0,0,0,0.15);
  
  /* Transitions */
  --transition-fast: 150ms;
  --transition-normal: 300ms;
  --transition-slow: 500ms;
  --transition-timing: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Variables */
.dark {
  --color-neutral-white: #0F172A;
  --color-neutral-gray-50: #1E293B;
  --color-neutral-gray-100: #334155;
  --color-neutral-gray-200: #475569;
  --color-neutral-gray-300: #64748B;
  --color-neutral-gray-400: #94A3B8;
  --color-neutral-gray-500: #CBD5E1;
  --color-neutral-gray-600: #E2E8F0;
  --color-neutral-gray-700: #F1F5F9;
  --color-neutral-gray-800: #F8FAFC;
  --color-neutral-gray-900: #FFFFFF;
  --color-neutral-black: #FFFFFF;
}

/* =============================================================================
   BASE STYLES
   ============================================================================= */

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  line-height: 1.5;
  color: var(--color-neutral-gray-900);
  background-color: var(--color-neutral-gray-100);
  margin: 0;
  padding: 0;
}

.dark body {
  color: var(--color-neutral-gray-200);
  background-color: var(--color-neutral-gray-50);
}

/* =============================================================================
   LAYOUT COMPONENTS
   ============================================================================= */

.theme-layout {
  display: flex;
  min-height: 100vh;
}

.theme-sidebar {
  width: 14rem;
  min-height: 100vh;
  background: linear-gradient(to bottom, var(--color-primary-blue), var(--color-primary-purple));
  box-shadow: var(--shadow-sidebar);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.5rem 0;
}

.theme-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.theme-topbar {
  background-color: var(--color-neutral-white);
  border-bottom: 1px solid var(--color-neutral-gray-200);
  padding: 1rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.dark .theme-topbar {
  background-color: var(--color-neutral-gray-100);
  border-bottom-color: var(--color-neutral-gray-200);
}

.theme-topbar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.theme-mobile-menu-btn {
  display: none;
  margin-right: 0.5rem;
}

.theme-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-neutral-gray-900);
  margin: 0;
}

.dark .theme-title {
  color: var(--color-neutral-gray-200);
}

.theme-topbar-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-content {
  flex: 1;
  padding: 1.5rem;
  background-color: var(--color-neutral-gray-50);
}

.dark .theme-content {
  background-color: var(--color-neutral-gray-50);
}

/* =============================================================================
   NAVIGATION COMPONENTS
   ============================================================================= */

.theme-nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: white;
  text-decoration: none;
  width: 100%;
  padding: 0.75rem 1rem;
  transition: background-color var(--transition-fast) var(--transition-timing);
  border-radius: 0;
  position: relative;
}

.theme-nav-item:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

.theme-nav-item.active {
  background-color: rgba(255, 255, 255, 0.2);
  font-weight: 600;
}

.theme-nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background-color: white;
  border-radius: 0 2px 2px 0;
}

.theme-nav-item.feature-disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.theme-nav-item.feature-disabled:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.theme-nav-icon {
  width: 2.5rem;
  height: 2.5rem;
  padding-left: 1rem;
}

/* =============================================================================
   BUTTON COMPONENTS
   ============================================================================= */

.theme-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 0.375rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast) var(--transition-timing);
  gap: 0.5rem;
  min-height: 2.5rem;
}

.theme-btn-primary {
  background-color: var(--color-primary-teal);
  color: white;
}

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

.theme-btn-secondary {
  background-color: var(--color-neutral-gray-200);
  color: var(--color-neutral-gray-800);
}

.dark .theme-btn-secondary {
  background-color: var(--color-neutral-gray-700);
  color: var(--color-neutral-gray-200);
}

.theme-btn-secondary:hover {
  background-color: var(--color-neutral-gray-300);
}

.dark .theme-btn-secondary:hover {
  background-color: var(--color-neutral-gray-600);
}

.theme-btn-danger {
  background-color: var(--color-danger);
  color: white;
}

.theme-btn-danger:hover {
  background-color: #DC2626;
}

/* =============================================================================
   CARD COMPONENTS
   ============================================================================= */

.theme-card {
  background-color: var(--color-neutral-white);
  border-radius: 0.5rem;
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
  border: 1px solid var(--color-neutral-gray-200);
}

.dark .theme-card {
  background-color: var(--color-neutral-gray-100);
  border-color: var(--color-neutral-gray-200);
}

.theme-card-header {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-neutral-gray-200);
}

.dark .theme-card-header {
  border-bottom-color: var(--color-neutral-gray-200);
}

/* =============================================================================
   TABLE COMPONENTS
   ============================================================================= */

.theme-table {
  width: 100%;
  border-collapse: collapse;
}

.theme-table thead {
  background-color: var(--color-neutral-gray-50);
}

.dark .theme-table thead {
  background-color: var(--color-neutral-gray-50);
}

.theme-table th {
  color: var(--color-neutral-gray-700);
  font-weight: 600;
}

.dark .theme-table th {
  color: var(--color-neutral-gray-400);
}

.theme-table td {
  color: var(--color-neutral-gray-800);
}

.dark .theme-table td {
  color: var(--color-neutral-gray-300);
}

.theme-table tbody tr {
  border-bottom: 1px solid var(--color-neutral-gray-200);
  transition: background-color var(--transition-fast);
}

.dark .theme-table tbody tr {
  border-bottom-color: var(--color-neutral-gray-200);
}

.theme-table tbody tr:hover {
  background-color: var(--color-neutral-gray-50);
}

.dark .theme-table tbody tr:hover {
  background-color: var(--color-neutral-gray-50);
}

.theme-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-neutral-gray-900);
  margin: 0;
}

.dark .theme-card-title {
  color: var(--color-neutral-gray-200);
}

/* =============================================================================
   FORM COMPONENTS
   ============================================================================= */

.theme-form-group {
  margin-bottom: 1rem;
}

.theme-form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--color-neutral-gray-700);
}

.dark .theme-form-label {
  color: var(--color-neutral-gray-400);
}

.theme-form-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-neutral-gray-300);
  border-radius: 0.375rem;
  font-size: 0.875rem;
  transition: border-color var(--transition-fast) var(--transition-timing);
  background-color: var(--color-neutral-white);
  color: var(--color-neutral-gray-900);
}

.dark .theme-form-input {
  background-color: var(--color-neutral-gray-100);
  border-color: var(--color-neutral-gray-300);
  color: var(--color-neutral-gray-200);
}

.theme-form-input:focus {
  outline: none;
  border-color: var(--color-primary-blue);
  box-shadow: 0 0 0 3px rgba(11, 135, 147, 0.1);
}

/* Filter grid helpers (e.g. employee search) */
.filter-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

/* =============================================================================
   DASHBOARD LAYOUT HELPERS
   ============================================================================= */

.dashboard-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.dashboard-main-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.5rem;
}

/* =============================================================================
   UTILITY CLASSES
   ============================================================================= */

.theme-text-primary { color: var(--color-primary-teal); }
.theme-text-success { color: var(--color-success); }
.theme-text-warning { color: var(--color-warning); }
.theme-text-danger { color: var(--color-danger); }
.theme-text-info { color: var(--color-info); }

.theme-bg-primary { background-color: var(--color-primary-teal); }
.theme-bg-success { background-color: var(--color-success); }
.theme-bg-warning { background-color: var(--color-warning); }
.theme-bg-danger { background-color: var(--color-danger); }
.theme-bg-info { background-color: var(--color-info); }

/* =============================================================================
   RESPONSIVE DESIGN
   ============================================================================= */

@media (max-width: 768px) {
  .theme-mobile-menu-btn {
    display: inline-flex;
  }

  .theme-layout {
    flex-direction: column;
  }

  .theme-sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    transform: translateX(-100%);
    transition: transform var(--transition-normal) var(--transition-timing);
    z-index: 40;
    width: 14rem;
  }

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

  .theme-sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal) var(--transition-timing);
    z-index: 30;
  }

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

  .theme-topbar {
    padding: 0.75rem 1rem;
  }

  .theme-content {
    padding: 1rem;
  }

  .dashboard-main-grid {
    grid-template-columns: 1fr;
  }

  .filter-grid {
    grid-template-columns: 1fr;
  }
}

/* =============================================================================
   ANIMATIONS & TRANSITIONS
   ============================================================================= */

.theme-fade-in {
  animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.theme-slide-in {
  animation: slideIn 0.3s ease-out;
}

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

/* =============================================================================
   THEME TOGGLE COMPONENTS
   ============================================================================= */

.theme-toggle-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 0.375rem;
  color: var(--color-neutral-gray-600);
  transition: all var(--transition-fast) var(--transition-timing);
}

.dark .theme-toggle-btn {
  color: var(--color-neutral-gray-400);
}

.theme-toggle-btn:hover {
  background-color: var(--color-neutral-gray-200);
  color: var(--color-neutral-gray-800);
}

.dark .theme-toggle-btn:hover {
  background-color: var(--color-neutral-gray-700);
  color: var(--color-neutral-gray-200);
}

.theme-toggle-icon {
  width: 1.25rem;
  height: 1.25rem;
}

/* =============================================================================
   USER MENU COMPONENTS
   ============================================================================= */

.theme-user-menu {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-user-name {
  font-size: 0.875rem;
  color: var(--color-neutral-gray-700);
  font-weight: 500;
}

.dark .theme-user-name {
  color: var(--color-neutral-gray-400);
}

.theme-logout-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.375rem;
  color: var(--color-neutral-gray-600);
  text-decoration: none;
  transition: all var(--transition-fast) var(--transition-timing);
}

.dark .theme-logout-btn {
  color: var(--color-neutral-gray-400);
}

.theme-logout-btn:hover {
  background-color: var(--color-neutral-gray-200);
  color: var(--color-neutral-gray-800);
}

.dark .theme-logout-btn:hover {
  background-color: var(--color-neutral-gray-700);
  color: var(--color-neutral-gray-200);
}

/* =============================================================================
   MOBILE NAVIGATION
   ============================================================================= */

.theme-mobile-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-neutral-white);
  border-top: 1px solid var(--color-neutral-gray-200);
  padding: 0.5rem;
  display: flex;
  justify-content: space-around;
  z-index: 10;
}

.dark .theme-mobile-nav {
  background-color: var(--color-neutral-gray-100);
  border-top-color: var(--color-neutral-gray-200);
}

@media (min-width: 769px) {
  .theme-mobile-nav {
    display: none;
  }
}

/* =============================================================================
   TOAST CONTAINER
   ============================================================================= */

.theme-toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.theme-toast {
  min-width: 260px;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  background-color: var(--color-neutral-gray-900);
  color: white;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity var(--transition-fast) var(--transition-timing),
              transform var(--transition-fast) var(--transition-timing);
}

.theme-toast.show {
  opacity: 1;
  transform: translateY(0);
}

.theme-toast-info {
  background-color: var(--color-info);
}

.theme-toast-success {
  background-color: var(--color-success);
}

.theme-toast-warning {
  background-color: var(--color-warning);
  color: var(--color-neutral-gray-900);
}

.theme-toast-error {
  background-color: var(--color-danger);
}

/* =============================================================================
   ADDITIONAL UTILITY CLASSES
   ============================================================================= */

.theme-text-center { text-align: center; }
.theme-text-left { text-align: left; }
.theme-text-right { text-align: right; }

.theme-font-bold { font-weight: 700; }
.theme-font-semibold { font-weight: 600; }
.theme-font-medium { font-weight: 500; }
.theme-font-normal { font-weight: 400; }

.theme-rounded { border-radius: 0.375rem; }
.theme-rounded-lg { border-radius: 0.5rem; }
.theme-rounded-full { border-radius: 9999px; }

.theme-shadow { box-shadow: var(--shadow-md); }
.theme-shadow-lg { box-shadow: var(--shadow-lg); }
.theme-shadow-none { box-shadow: none; }

.theme-transition { transition: all var(--transition-normal) var(--transition-timing); }
.theme-transition-fast { transition: all var(--transition-fast) var(--transition-timing); }
.theme-transition-slow { transition: all var(--transition-slow) var(--transition-timing); }

/* Responsive table -> card layout on small screens */
@media (max-width: 768px) {
  .responsive-table {
    border-collapse: separate;
    border-spacing: 0 0.75rem;
  }

  .responsive-table thead {
    display: none;
  }

  .responsive-table tbody tr {
    display: block;
    border: 1px solid var(--color-neutral-gray-200);
    border-radius: 0.75rem;
    padding: 0.5rem 0.75rem;
    background-color: var(--color-neutral-white);
    box-shadow: var(--shadow-sm);
  }

  .responsive-table tbody tr + tr {
    margin-top: 0.25rem;
  }

  .responsive-table td {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 0.4rem 0.25rem;
    border: none;
    font-size: 0.85rem;
  }

  .responsive-table td::before {
    content: attr(data-label);
    font-weight: 600;
    color: var(--color-neutral-gray-600);
    margin-right: 0.75rem;
    flex: 0 0 45%;
    max-width: 55%;
  }

  .responsive-table td:last-child {
    padding-top: 0.6rem;
  }
}

/* =============================================================================
   ALERT/FLASH MESSAGE COMPONENTS
   ============================================================================= */

.theme-alert {
  padding: 0.75rem 1rem;
  border-radius: 0.375rem;
  margin-bottom: 1rem;
  border: 1px solid;
  font-size: 0.875rem;
}

.theme-alert-success {
  background-color: rgba(16, 185, 129, 0.1);
  border-color: var(--color-success);
  color: var(--color-success);
}

.theme-alert-danger {
  background-color: rgba(255, 88, 107, 0.1);
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.theme-alert-warning {
  background-color: rgba(255, 141, 96, 0.1);
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.theme-alert-info {
  background-color: rgba(59, 130, 246, 0.1);
  border-color: var(--color-info);
  color: var(--color-info);
}

.dark .theme-alert-success {
  background-color: rgba(16, 185, 129, 0.2);
}

.dark .theme-alert-danger {
  background-color: rgba(255, 88, 107, 0.2);
}

.dark .theme-alert-warning {
  background-color: rgba(255, 141, 96, 0.2);
}

.dark .theme-alert-info {
  background-color: rgba(59, 130, 246, 0.2);
}