/**
 * Námsbókasafn Common Styles
 *
 * Shared CSS for the translation workflow server interface.
 * This file provides consistent styling across all pages.
 *
 * Table of Contents:
 * 1. CSS Custom Properties (Light + Dark Mode)
 * 2. Base Styles (Reset, Typography)
 * 3. Header Component
 * 4. Navigation Styles
 * 5. Card Components
 * 6. Button Styles
 * 7. Form Styles
 * 8. Modal Styles
 * 9. Alert & Badge Styles
 * 10. Utility Classes
 * 11. Responsive Breakpoints
 */

/* ==========================================================================
   1. CSS CUSTOM PROPERTIES
   ========================================================================== */

:root {
  /* Primary Colors */
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;

  /* Status Colors */
  --success: #16a34a;
  --success-light: #dcfce7;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --error: #dc2626;
  --error-light: #fee2e2;
  --info: #0891b2;
  --info-light: #cffafe;

  /* Gray Scale */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  /* Semantic Colors */
  --bg-page: #f9fafb;
  --bg-card: #ffffff;
  --bg-sidebar: #ffffff;
  --text-primary: #111827;
  --text-secondary: #374151;
  --text-muted: #6b7280;
  --border-color: #e5e7eb;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.2s ease;
  --transition-slow: 0.3s ease;
}

/* Dark Mode */
[data-theme="dark"] {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-light: #1e3a5f;
  --success: #22c55e;
  --success-light: #14532d;
  --warning: #f59e0b;
  --warning-light: #451a03;
  --error: #ef4444;
  --error-light: #450a0a;
  --info: #06b6d4;
  --info-light: #164e63;
  --gray-50: #0f172a;
  --gray-100: #1e293b;
  --gray-200: #334155;
  --gray-300: #475569;
  --gray-400: #64748b;
  --gray-500: #94a3b8;
  --gray-600: #cbd5e1;
  --gray-700: #e2e8f0;
  --gray-800: #f1f5f9;
  --gray-900: #f8fafc;
  --bg-page: #0f172a;
  --bg-card: #1e293b;
  --bg-sidebar: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #e2e8f0;
  --text-muted: #94a3b8;
  --border-color: #334155;
}

/* System preference detection (when no explicit theme is set) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #1e3a5f;
    --success: #22c55e;
    --success-light: #14532d;
    --warning: #f59e0b;
    --warning-light: #451a03;
    --error: #ef4444;
    --error-light: #450a0a;
    --info: #06b6d4;
    --info-light: #164e63;
    --gray-50: #0f172a;
    --gray-100: #1e293b;
    --gray-200: #334155;
    --gray-300: #475569;
    --gray-400: #64748b;
    --gray-500: #94a3b8;
    --gray-600: #cbd5e1;
    --gray-700: #e2e8f0;
    --gray-800: #f1f5f9;
    --gray-900: #f8fafc;
    --bg-page: #0f172a;
    --bg-card: #1e293b;
    --bg-sidebar: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #e2e8f0;
    --text-muted: #94a3b8;
    --border-color: #334155;
  }
}

/* ==========================================================================
   2. BASE STYLES
   ========================================================================== */

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   3. HEADER COMPONENT
   ========================================================================== */

.header {
  background: var(--bg-card);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  gap: 2rem;
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary);
  white-space: nowrap;
}

.header nav {
  display: flex;
  gap: 0.5rem;
  flex: 1;
}

.header nav a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 400;
  transition: all var(--transition-fast);
}

.header nav a:hover {
  color: var(--text-secondary);
  background: var(--gray-100);
  text-decoration: none;
}

/* Active navigation - pill style (standardized) */
.header nav a.active {
  color: var(--primary);
  background: var(--primary-light);
  font-weight: 500;
}

/* Header Actions (right side) */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* User Info */
.user-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.user-info img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
}

/* Theme Toggle Button */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--gray-100);
  color: var(--text-primary);
  border-color: var(--gray-300);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

/* Sun/Moon icons for theme toggle */
.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: none;
}

:root:not([data-theme="dark"]) .theme-toggle .icon-moon,
[data-theme="light"] .theme-toggle .icon-moon {
  display: block;
}

:root:not([data-theme="dark"]) .theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun {
    display: block;
  }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon {
    display: none;
  }
}

/* Notification Bell */
.notification-bell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.notification-bell:hover {
  background: var(--gray-100);
  color: var(--text-primary);
  border-color: var(--gray-300);
}

.notification-bell svg {
  width: 18px;
  height: 18px;
}

.notification-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  background: var(--error);
  color: white;
  font-size: 0.625rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ==========================================================================
   4. CONTAINER & LAYOUT
   ========================================================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

.container-narrow {
  max-width: 800px;
}

.container-wide {
  max-width: 1400px;
}

/* ==========================================================================
   5. CARD COMPONENTS
   ========================================================================== */

.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.card-padded {
  padding: var(--spacing-lg);
}

.card + .card {
  margin-top: var(--spacing-lg);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--gray-50);
}

.card-header-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.card-header-flex .card-title {
  margin-bottom: 0;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-body {
  padding: 1.25rem;
}

.card-footer {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border-color);
  background: var(--gray-50);
}

/* ==========================================================================
   6. BUTTON STYLES
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:hover {
  text-decoration: none;
}

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

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

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

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--gray-100);
  border-color: var(--gray-300);
}

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

.btn-success:hover:not(:disabled) {
  background: #15803d;
}

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

.btn-warning:hover:not(:disabled) {
  background: #b45309;
}

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

.btn-error:hover:not(:disabled) {
  background: #b91c1c;
}

/* Button Sizes */
.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
}

/* Icon Button */
.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  background: transparent;
  border: none;
  color: var(--text-muted);
  border-radius: var(--radius-md);
}

.btn-icon:hover {
  background: var(--gray-100);
  color: var(--primary);
}

/* Close Button */
.btn-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  color: var(--text-muted);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.btn-close:hover {
  background: var(--gray-100);
  color: var(--text-primary);
}

/* ==========================================================================
   7. FORM STYLES
   ========================================================================== */

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

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  background: var(--bg-card);
  color: var(--text-primary);
  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(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-select {
  cursor: pointer;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

/* Search Bar */
.search-bar {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.search-input-wrapper {
  flex: 1;
  position: relative;
}

.search-input-wrapper i,
.search-input-wrapper svg {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-input-wrapper input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 1rem;
  background: var(--bg-card);
  color: var(--text-primary);
}

.search-input-wrapper input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Filters */
.filters {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-group label {
  font-size: 0.875rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ==========================================================================
   8. MODAL STYLES
   ========================================================================== */

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  justify-content: center;
  align-items: center;
  z-index: 1000;
  padding: 1rem;
}

.modal-content {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.modal-large {
  max-width: 700px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
}

/* ==========================================================================
   9. ALERT & BADGE STYLES
   ========================================================================== */

/* Alerts */
.alert {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
}

.alert-success {
  background: var(--success-light);
  color: #166534;
  border: 1px solid #86efac;
}

.alert-warning {
  background: var(--warning-light);
  color: #92400e;
  border: 1px solid #fcd34d;
}

.alert-error {
  background: var(--error-light);
  color: #991b1b;
  border: 1px solid #fca5a5;
}

.alert-info {
  background: var(--info-light);
  color: #0e7490;
  border: 1px solid #67e8f9;
}

.alert a {
  color: inherit;
  font-weight: 500;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--gray-200);
  color: var(--gray-700);
}

.badge-primary {
  background: var(--primary-light);
  color: #1e40af;
}

.badge-success {
  background: var(--success-light);
  color: #166534;
}

.badge-warning {
  background: var(--warning-light);
  color: #92400e;
}

.badge-error {
  background: var(--error-light);
  color: #991b1b;
}

/* Status Badges */
.status-badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
}

.status-approved {
  background: #dcfce7;
  color: #166534;
}

.status-proposed {
  background: #dbeafe;
  color: #1e40af;
}

.status-disputed {
  background: #fee2e2;
  color: #991b1b;
}

.status-needs_review {
  background: #fef3c7;
  color: #92400e;
}

.status-complete {
  background: var(--success-light);
  color: #166534;
}

.status-in-progress {
  background: var(--primary-light);
  color: #1e40af;
}

.status-pending {
  background: var(--warning-light);
  color: #92400e;
}

.status-not-started {
  background: var(--gray-200);
  color: var(--gray-600);
}

/* ==========================================================================
   10. UTILITY CLASSES
   ========================================================================== */

/* Text */
.text-muted { color: var(--text-muted); }
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-lg { font-size: 1.125rem; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

/* Spacing */
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }

/* Display */
.hidden { display: none; }
.flex { display: flex; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }

/* Empty State */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
}

.empty-state a {
  color: var(--primary);
}

/* Loading */
.loading {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}

/* Progress Bar */
.progress-bar {
  width: 100%;
  height: 0.5rem;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--primary);
  transition: width var(--transition-slow);
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  padding-top: 1rem;
}

.page-info {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tab {
  padding: 0.5rem 1rem;
  border: none;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.tab:hover {
  background: var(--gray-100);
}

.tab.active {
  background: var(--primary);
  color: white;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 1rem;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.stat-icon {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-value.stat-success { color: var(--success); }
.stat-value.stat-warning { color: var(--warning); }
.stat-value.stat-error { color: var(--error); }

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 0.75rem 1.25rem;
  background: var(--gray-800);
  color: white;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  opacity: 0;
  transition: opacity var(--transition-slow), transform var(--transition-slow);
  z-index: 2000;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

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

/* Floating Feedback Button */
.feedback-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
}

.feedback-fab-btn {
  width: 56px;
  height: 56px;
  border-radius: 28px;
  background: linear-gradient(135deg, #8b5cf6 0%, #6d28d9 100%);
  color: white;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(109, 40, 217, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  text-decoration: none;
}

.feedback-fab-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 16px rgba(109, 40, 217, 0.5);
  color: white;
  text-decoration: none;
}

/* ==========================================================================
   11. RESPONSIVE BREAKPOINTS
   ========================================================================== */

@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }

  .header nav {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }

  .header-actions {
    width: 100%;
    justify-content: center;
  }

  .container {
    padding: 1rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .search-bar {
    flex-direction: column;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .modal-content {
    margin: 0.5rem;
    max-height: calc(100vh - 1rem);
  }
}

@media (max-width: 480px) {
  .header nav {
    gap: 0.25rem;
  }

  .header nav a {
    padding: 0.375rem 0.5rem;
    font-size: 0.8125rem;
  }

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

  .stat-card {
    padding: 0.75rem;
  }

  .stat-value {
    font-size: 1.25rem;
  }
}