/* =================================
   LearnFlow LMS - Global Styles
   ================================= */

:root {
  /* Primary Colors */
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  
  /* Secondary Colors */
  --secondary-color: #ec4899;
  --secondary-dark: #db2777;
  
  /* Neutral Colors */
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  
  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  
  /* Border Colors */
  --border-color: #e5e7eb;
  --border-light: #f3f4f6;
  
  /* Status Colors */
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --info-color: #3b82f6;
  
  /* Shadow */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition: all 0.3s ease;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-light: #9ca3af;
  
  --bg-primary: #111827;
  --bg-secondary: #1f2937;
  --bg-tertiary: #374151;
  
  --border-color: #374151;
  --border-light: #4b5563;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  cursor: pointer;
  border: none;
  outline: none;
  font-family: inherit;
  transition: var(--transition);
}

input, textarea, select {
  font-family: inherit;
  outline: none;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-fluid {
  max-width: 100%;
  padding: 0 1.5rem;
}

/* Navigation Bar */
.navbar {
  background-color: var(--bg-primary);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.navbar-logo i {
  font-size: 1.75rem;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.navbar-menu a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition);
}

.navbar-menu a:hover {
  color: var(--primary-color);
}

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

.navbar-search {
  position: relative;
  display: flex;
  align-items: center;
}

.navbar-search input {
  padding: 0.5rem 2.5rem 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  width: 250px;
  transition: var(--transition);
}

.navbar-search input:focus {
  border-color: var(--primary-color);
  width: 300px;
}

.navbar-search i {
  position: absolute;
  right: 0.75rem;
  color: var(--text-light);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  font-size: 1.5rem;
  color: var(--text-primary);
}

/* Buttons */
.btn {
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9375rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  text-align: center;
  justify-content: center;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
  background-color: var(--secondary-dark);
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

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

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

.btn-ghost:hover {
  background-color: var(--bg-tertiary);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 0.875rem 2rem;
  font-size: 1rem;
}

/* Cards */
.card {
  background-color: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: var(--transition);
}

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

.card-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background-color: var(--bg-tertiary);
}

.card-body {
  padding: 1.25rem;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.card-text {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 1rem;
}

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

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-xl);
  font-size: 0.8125rem;
  font-weight: 600;
  gap: 0.25rem;
}

.badge-primary {
  background-color: rgba(99, 102, 241, 0.1);
  color: var(--primary-color);
}

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

.badge-warning {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--warning-color);
}

.badge-error {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--error-color);
}

/* Progress Bar */
.progress {
  width: 100%;
  height: 8px;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
  border-radius: var(--radius-xl);
  transition: width 0.3s ease;
}

/* Stats Card */
.stat-card {
  background-color: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: var(--transition);
}

.stat-card:hover {
  box-shadow: var(--shadow-lg);
}

.stat-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.stat-icon.primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: white;
}

.stat-icon.success {
  background: linear-gradient(135deg, #10b981, #34d399);
  color: white;
}

.stat-icon.warning {
  background: linear-gradient(135deg, #f59e0b, #fbbf24);
  color: white;
}

.stat-icon.error {
  background: linear-gradient(135deg, #ef4444, #f87171);
  color: white;
}

.stat-content h3 {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.stat-content p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* Form Elements */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9375rem;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.9375rem;
  transition: var(--transition);
}

.form-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.9375rem;
  min-height: 120px;
  resize: vertical;
  transition: var(--transition);
}

.form-textarea:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.9375rem;
  cursor: pointer;
  transition: var(--transition);
}

/* Grid System */
.grid {
  display: grid;
  gap: 1.5rem;
}

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

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* Flex Utilities */
.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.flex-wrap {
  flex-wrap: wrap;
}

.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.gap-4 { gap: 2rem; }

/* Spacing Utilities */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }

.pt-3 { padding-top: 1.5rem; }
.pt-4 { padding-top: 2rem; }
.pt-5 { padding-top: 3rem; }

.pb-3 { padding-bottom: 1.5rem; }
.pb-4 { padding-bottom: 2rem; }
.pb-5 { padding-bottom: 3rem; }

/* Text Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

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

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

/* Dark Mode Toggle */
.theme-toggle {
  width: 50px;
  height: 28px;
  background-color: var(--bg-tertiary);
  border-radius: 50px;
  position: relative;
  cursor: pointer;
  transition: var(--transition);
}

.theme-toggle::before {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: var(--primary-color);
  top: 3px;
  left: 3px;
  transition: var(--transition);
}

[data-theme="dark"] .theme-toggle::before {
  transform: translateX(22px);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .navbar-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
    box-shadow: var(--shadow-lg);
    display: none;
  }

  .navbar-menu.active {
    display: flex;
  }

  .navbar-search input {
    width: 200px;
  }

  .navbar-search input:focus {
    width: 220px;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 0 1rem;
  }
}

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

  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
  }
}

/* Loading Spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

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

.modal {
  background-color: var(--bg-primary);
  border-radius: var(--radius-xl);
  max-width: 600px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: scale(0.9);
  transition: var(--transition);
}

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

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

.modal-header h2 {
  font-size: 1.5rem;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  font-size: 1.5rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.modal-body {
  padding: 1.5rem;
}

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

/* Tabs */
.tabs {
  display: flex;
  border-bottom: 2px solid var(--border-color);
  gap: 2rem;
  margin-bottom: 2rem;
}

.tab {
  padding: 1rem 0;
  color: var(--text-secondary);
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: var(--transition);
}

.tab:hover {
  color: var(--primary-color);
}

.tab.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Rating Stars */
.rating {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.rating i {
  color: #fbbf24;
  font-size: 1rem;
}

.rating-count {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-left: 0.5rem;
}

/* Avatar */
.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  background-color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
}

.avatar-lg {
  width: 80px;
  height: 80px;
  font-size: 1.5rem;
}

/* Alerts */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.alert-success {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--success-color);
  border-left: 4px solid var(--success-color);
}

.alert-error {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--error-color);
  border-left: 4px solid var(--error-color);
}

.alert-warning {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--warning-color);
  border-left: 4px solid var(--warning-color);
}

.alert-info {
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--info-color);
  border-left: 4px solid var(--info-color);
}