/* ============================================================================
   TransLetus Translation Tool - Professional Styling
   
   Design inspired by TransLetus branding
   Colors: Navy Blue (#003057), Gold/Yellow (#FFC600)
   
   Easy copy-paste for Python Flask templates
   All original class names preserved
   ============================================================================ */

/* ============================================================================
   CSS VARIABLES - DESIGN SYSTEM
   ============================================================================ */
:root {
  /* TransLetus Brand Colors */
  --transletus-gold: #FFC600;
  --transletus-gold-hover: #FFD633;
  --transletus-gold-dark: #E6B200;
  
  /* Primary Colors - Navy Blue Theme */
  --primary-navy: #003057;
  --primary-navy-dark: #001F3F;
  --primary-blue: #0066A1;
  --primary-blue-light: #4D94CC;
  
  /* Accent Colors */
  --accent-gold: #D4AF37;
  --accent-blue: #0066A1;
  --accent-blue-hover: #005080;
  
  /* Semantic Colors */
  --primary-action: #003057;
  --primary-action-hover: #001F3F;
  --primary-action-light: #E3F2FD;
  
  --info-blue: #0277BD;
  --info-blue-hover: #01579B;
  --info-blue-light: #E1F5FE;
  
  --warning-orange: #FF6B35;
  --warning-orange-hover: #E64A19;
  
  --danger-red: #D32F2F;
  --danger-red-hover: #B71C1C;
  
  /* Neutral Colors */
  --neutral-50: #FAFAFA;
  --neutral-100: #F5F5F5;
  --neutral-200: #EEEEEE;
  --neutral-300: #E0E0E0;
  --neutral-400: #BDBDBD;
  --neutral-500: #9E9E9E;
  --neutral-600: #757575;
  --neutral-700: #616161;
  --neutral-800: #424242;
  --neutral-900: #212121;
  
  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Courier New', Courier, monospace;
  
  /* Spacing Scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* 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-glow: 0 0 15px rgba(255, 198, 0, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================================
   GLOBAL RESET & BASE STYLES
   ============================================================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--neutral-800);
  background: linear-gradient(135deg, var(--neutral-50) 0%, var(--neutral-100) 100%);
  min-height: 100vh;
}

/* ============================================================================
   NAVIGATION BAR
   ============================================================================ */
nav {
  background: linear-gradient(135deg, var(--primary-navy) 0%, var(--primary-blue) 100%);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 3px solid var(--transletus-gold);
}

nav ul {
  list-style: none;
  display: flex;
  align-items: center;
  padding: 0;
  margin: 0;
  max-width: 1400px;
  margin: 0 auto;
}

nav li {
  margin: 0;
}

nav a {
  display: block;
  padding: var(--space-lg) var(--space-xl);
  color: white;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.3px;
  transition: all var(--transition-base);
  position: relative;
  text-transform: uppercase;
  font-size: 0.875rem;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 3px;
  background: var(--transletus-gold);
  transition: all var(--transition-base);
  transform: translateX(-50%);
}

nav a:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--transletus-gold);
}

nav a:hover::after {
  width: 80%;
}

nav a.active {
  background: rgba(255, 255, 255, 0.15);
  color: var(--transletus-gold);
  font-weight: 600;
}

nav a.active::after {
  width: 80%;
}

/* User info in nav */
nav .user-info {
  margin-left: auto;
  padding: var(--space-md) var(--space-xl);
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

nav .user-info a {
  padding: var(--space-sm) var(--space-lg);
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  text-transform: none;
}

nav .user-info a:hover {
  background: rgba(255, 255, 255, 0.3);
  color: white;
}

/* ============================================================================
   MAIN CONTAINER & LAYOUT
   ============================================================================ */
.container {
  max-width: 1400px;
  margin: var(--space-2xl) auto;
  padding: 0 var(--space-xl);
}

.page-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-lg);
  border-bottom: 3px solid var(--transletus-gold);
}

.page-title,
h1 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--primary-navy);
  margin-bottom: var(--space-md);
  letter-spacing: -0.5px;
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--primary-navy);
  margin-bottom: var(--space-lg);
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--neutral-800);
  margin-bottom: var(--space-md);
}

/* ============================================================================
   CARDS & PANELS
   ============================================================================ */
.card,
.panel,
.content-card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-2xl);
  margin-bottom: var(--space-xl);
  border: 1px solid var(--neutral-200);
  transition: all var(--transition-base);
}

.card:hover,
.panel:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 2px solid var(--neutral-200);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary-navy);
  margin: 0;
}

/* ============================================================================
   FORMS & INPUTS
   ============================================================================ */
.form-group {
  margin-bottom: var(--space-xl);
}

label {
  display: block;
  font-weight: 600;
  color: var(--neutral-800);
  margin-bottom: var(--space-sm);
  font-size: 0.9375rem;
  letter-spacing: 0.2px;
}

label i {
  color: var(--neutral-500);
  margin-left: var(--space-xs);
  cursor: help;
  font-size: 0.875rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  border: 2px solid var(--neutral-300);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: var(--font-primary);
  color: var(--neutral-800);
  background: white;
  transition: all var(--transition-base);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary-ocean);
  box-shadow: 0 0 0 3px rgba(0, 102, 161, 0.1);
}

input[type="text"]:hover,
input[type="email"]:hover,
input[type="password"]:hover,
input[type="number"]:hover,
select:hover,
textarea:hover {
  border-color: var(--neutral-400);
}

textarea {
  min-height: 200px;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  line-height: 1.8;
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23757575' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-md) center;
  padding-right: var(--space-2xl);
  cursor: pointer;
}

input::placeholder,
textarea::placeholder {
  color: var(--neutral-400);
}

/* ============================================================================
   BUTTONS
   ============================================================================ */
button,
.btn,
input[type="submit"],
input[type="button"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-2xl);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-primary);
  text-decoration: none;
  text-align: center;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  letter-spacing: 0.3px;
}

/* Primary Button - Navy Blue */
button,
.btn-primary,
input[type="submit"] {
  background: linear-gradient(135deg, var(--primary-navy) 0%, var(--primary-blue) 100%);
  color: white;
  box-shadow: var(--shadow-md);
}

button:hover,
.btn-primary:hover,
input[type="submit"]:hover {
  background: linear-gradient(135deg, var(--primary-navy-dark) 0%, var(--accent-blue-hover) 100%);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

button:active,
.btn-primary:active,
input[type="submit"]:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* Secondary Button - Lighter Blue */
.btn-secondary {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
  background: linear-gradient(135deg, var(--accent-blue-hover) 0%, var(--primary-blue) 100%);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* Accent Button - TransLetus Gold */
.btn-accent,
.btn-yellow {
  background: linear-gradient(135deg, var(--transletus-gold) 0%, var(--accent-gold) 100%);
  color: var(--primary-navy);
  box-shadow: var(--shadow-md);
  font-weight: 700;
}

.btn-accent:hover,
.btn-yellow:hover {
  background: linear-gradient(135deg, var(--transletus-gold-hover) 0%, var(--transletus-gold) 100%);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

/* Danger Button */
.btn-danger {
  background: linear-gradient(135deg, var(--danger-red) 0%, var(--warning-orange-hover) 100%);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-danger:hover {
  background: linear-gradient(135deg, var(--danger-red-hover) 0%, var(--danger-red) 100%);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* Outline Button */
.btn-outline {
  background: transparent;
  border: 2px solid var(--primary-navy);
  color: var(--primary-navy);
  box-shadow: none;
}

.btn-outline:hover {
  background: var(--primary-navy);
  color: white;
  box-shadow: var(--shadow-md);
}

/* Small Button */
.btn-sm {
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.875rem;
}

/* Large Button */
.btn-lg {
  padding: var(--space-lg) var(--space-3xl);
  font-size: 1.125rem;
}

/* Disabled State */
button:disabled,
.btn:disabled,
input[type="submit"]:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ============================================================================
   TABLES
   ============================================================================ */
.table-container {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  margin-bottom: var(--space-xl);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

thead {
  background: linear-gradient(135deg, var(--primary-navy) 0%, var(--primary-ocean) 100%);
}

thead th {
  padding: var(--space-lg) var(--space-md);
  text-align: left;
  font-weight: 600;
  color: white;
  text-transform: uppercase;
  font-size: 0.8125rem;
  letter-spacing: 0.5px;
  border-bottom: 3px solid var(--transletus-gold);
}

tbody tr {
  border-bottom: 1px solid var(--neutral-200);
  transition: all var(--transition-fast);
}

tbody tr:hover {
  background: var(--neutral-50);
  transform: scale(1.01);
  box-shadow: var(--shadow-sm);
}

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

tbody td {
  padding: var(--space-lg) var(--space-md);
  color: var(--neutral-700);
}

/* Table Actions Column */
td.actions {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

/* Action Icons/Buttons in Tables */
.action-btn,
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  background: transparent;
}

.action-btn.view,
.icon-btn.view {
  color: var(--info-blue);
}

.action-btn.view:hover,
.icon-btn.view:hover {
  background: var(--info-blue-light);
  color: var(--info-blue-hover);
}

.action-btn.delete,
.icon-btn.delete {
  color: var(--danger-red);
}

.action-btn.delete:hover,
.icon-btn.delete:hover {
  background: #FFEBEE;
  color: var(--danger-red-hover);
}

.action-btn.edit,
.icon-btn.edit {
  color: var(--primary-navy);
}

.action-btn.edit:hover,
.icon-btn.edit:hover {
  background: var(--primary-action-light);
  color: var(--primary-navy-dark);
}

/* ============================================================================
   ALERTS & MESSAGES
   ============================================================================ */
.alert {
  padding: var(--space-lg) var(--space-xl);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-xl);
  border-left: 4px solid;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.alert-success {
  background: var(--primary-action-light);
  border-color: var(--primary-navy);
  color: var(--primary-navy-dark);
}

.alert-info {
  background: var(--info-blue-light);
  border-color: var(--info-blue);
  color: var(--info-blue-hover);
}

.alert-warning {
  background: #FFF3E0;
  border-color: var(--warning-orange);
  color: var(--warning-orange-hover);
}

.alert-danger {
  background: #FFEBEE;
  border-color: var(--danger-red);
  color: var(--danger-red-hover);
}

/* ============================================================================
   BADGES & LABELS
   ============================================================================ */
.badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-success {
  background: var(--primary-action-light);
  color: var(--primary-navy);
}

.badge-info {
  background: var(--info-blue-light);
  color: var(--info-blue);
}

.badge-warning {
  background: #FFF3E0;
  color: var(--warning-orange);
}

.badge-danger {
  background: #FFEBEE;
  color: var(--danger-red);
}

/* ============================================================================
   LOADING STATES
   ============================================================================ */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.8s linear infinite;
}

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

.skeleton {
  background: linear-gradient(90deg, var(--neutral-200) 25%, var(--neutral-300) 50%, var(--neutral-200) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

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

/* ============================================================================
   RESPONSIVE UTILITIES
   ============================================================================ */
@media (max-width: 768px) {
  nav ul {
    flex-direction: column;
    align-items: stretch;
  }
  
  nav a {
    padding: var(--space-md) var(--space-lg);
  }
  
  nav .user-info {
    margin-left: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
  }
  
  .container {
    padding: 0 var(--space-md);
    margin: var(--space-lg) auto;
  }
  
  .card,
  .panel,
  .content-card {
    padding: var(--space-lg);
  }
  
  .page-title,
  h1 {
    font-size: 1.75rem;
  }
  
  table {
    font-size: 0.875rem;
  }
  
  thead th,
  tbody td {
    padding: var(--space-md) var(--space-sm);
  }
  
  .table-container {
    overflow-x: auto;
  }
}

/* ============================================================================
   SPECIFIC COMPONENT STYLES
   ============================================================================ */

/* Translator Form */
.translator-form {
  display: grid;
  gap: var(--space-xl);
}

.translator-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

@media (max-width: 768px) {
  .translator-row {
    grid-template-columns: 1fr;
  }
}

/* Briefing Card */
.briefing-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  border-left: 4px solid var(--transletus-gold);
  transition: all var(--transition-base);
}

.briefing-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateX(4px);
}

/* Search Bar */
.search-bar {
  position: relative;
  margin-bottom: var(--space-xl);
}

.search-bar input {
  padding-left: var(--space-3xl);
}

.search-bar::before {
  content: '🔍';
  position: absolute;
  left: var(--space-lg);
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
}

/* Stats Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.stat-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  border-top: 4px solid;
  transition: all var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.stat-card.primary {
  border-color: var(--primary-ocean);
}

.stat-card.success {
  border-color: var(--primary-navy);
}

.stat-card.warning {
  border-color: var(--transletus-gold);
}

.stat-card.danger {
  border-color: var(--danger-red);
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-navy);
  margin: var(--space-md) 0;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--neutral-600);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--space-3xl) var(--space-xl);
  color: var(--neutral-500);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--space-lg);
  opacity: 0.5;
}

.empty-state-text {
  font-size: 1.125rem;
  color: var(--neutral-600);
  margin-bottom: var(--space-md);
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.pagination button,
.pagination a {
  padding: var(--space-sm) var(--space-md);
  min-width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--neutral-300);
  background: white;
  color: var(--neutral-700);
  transition: all var(--transition-base);
}

.pagination button:hover,
.pagination a:hover {
  background: var(--primary-ocean);
  color: white;
  border-color: var(--primary-ocean);
  transform: translateY(-2px);
}

.pagination .active {
  background: var(--primary-navy);
  color: white;
  border-color: var(--primary-navy);
  font-weight: 600;
}

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

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.fade-in {
  animation: fadeIn var(--transition-base) ease-out;
}

.slide-in {
  animation: slideInRight var(--transition-base) ease-out;
}

/* ============================================================================
   UTILITY CLASSES
   ============================================================================ */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

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

.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }
.mb-4 { margin-bottom: var(--space-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }
.mt-4 { margin-top: var(--space-xl); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-md); }
.gap-4 { gap: var(--space-xl); }

.hidden { display: none; }
.block { display: block; }

/* ============================================================================
   PRINT STYLES
   ============================================================================ */
@media print {
  nav,
  .action-btn,
  .icon-btn,
  button,
  .btn {
    display: none !important;
  }
  
  body {
    background: white;
  }
  
  .card,
  .panel,
  .table-container {
    box-shadow: none;
    border: 1px solid var(--neutral-300);
  }
}