/**
 * LmsEg - Premium Learning Management System Design System
 * Brand Palette:
 * Primary Navy: #142D4E
 * Accent Teal: #14B8A6
 * Main Background: #F8FAFC
 * Surface: #FFFFFF
 * Secondary Accent: #F59E0B
 */

@import url('https://fonts.googleapis.com/css2?family=Cairo:wght@400;500;600;700;800&family=Inter:wght@400;500;600;700&display=swap');
@import url('https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css');

:root {
  --font-arabic: 'Cairo', system-ui, -apple-system, sans-serif;
  --font-latin: 'Inter', system-ui, -apple-system, sans-serif;
  --font-sans: var(--font-arabic);

  --color-primary: #142D4E;
  --color-primary-dark: #0D1E35;
  --color-primary-light: #1E3D6B;
  --color-accent: #14B8A6;
  --color-accent-hover: #0D9488;
  --color-accent-light: #CCFBF1;
  --color-secondary: #F59E0B;
  --color-secondary-hover: #D97706;

  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-surface-hover: #F1F5F9;
  
  --color-text-main: #0F172A;
  --color-text-muted: #64748B;
  --color-text-light: #94A3B8;
  
  --color-border: #E2E8F0;
  --color-border-focus: #14B8A6;
  
  --color-success: #10B981;
  --color-success-bg: #ECFDF5;
  --color-danger: #EF4444;
  --color-danger-bg: #FEF2F2;
  --color-warning: #F59E0B;
  --color-warning-bg: #FFFBEB;
  --color-info: #0284C7;
  --color-info-bg: #F0F9FF;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;

  --header-height: 72px;
  --sidebar-width: 260px;
}

[lang="en"] {
  --font-sans: var(--font-latin);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

a {
  color: var(--color-accent-hover);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-primary);
  font-weight: 700;
  line-height: 1.3;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

p {
  margin-bottom: 1rem;
}

.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent-hover); }
.text-danger { color: var(--color-danger); }
.text-success { color: var(--color-success); }

/* Layout Containers */
.container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

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

/* Navigation Header */
.site-header {
  height: var(--header-height);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
}

.navbar-brand .brand-badge {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: white;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  font-weight: 600;
  color: var(--color-text-main);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--color-accent-hover);
  background-color: var(--color-bg);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* Language Switcher */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-main);
  background: var(--color-surface);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-hover);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 3px solid rgba(20, 184, 166, 0.4);
  outline-offset: 2px;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-light);
  color: #FFFFFF;
  box-shadow: var(--shadow-sm);
}

.btn-accent {
  background-color: var(--color-accent);
  color: #FFFFFF;
}

.btn-accent:hover {
  background-color: var(--color-accent-hover);
  color: #FFFFFF;
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  background-color: var(--color-secondary-hover);
  color: #FFFFFF;
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-text-main);
}

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

.btn-danger {
  background-color: var(--color-danger);
  color: #FFFFFF;
}

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

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1.1rem;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

/* Cards & Surfaces */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--color-border);
}

/* Course Card */
.course-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent-light);
}

.course-card-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  background-color: #0F172A;
  overflow: hidden;
}

.course-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.course-card-badge {
  position: absolute;
  top: 1rem;
  inset-inline-start: 1rem;
  background-color: rgba(20, 45, 78, 0.85);
  backdrop-filter: blur(4px);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
}

.course-card-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.course-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.course-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: var(--color-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-card-summary {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.course-price {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
}

.course-price.free {
  color: var(--color-success);
}

/* Stat KPI Cards */
.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.stat-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
}

.stat-icon.primary { background: #E0E7FF; color: var(--color-primary); }
.stat-icon.teal { background: var(--color-accent-light); color: var(--color-accent-hover); }
.stat-icon.amber { background: var(--color-warning-bg); color: var(--color-secondary); }
.stat-icon.emerald { background: var(--color-success-bg); color: var(--color-success); }

.stat-content .stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.1;
}

.stat-content .stat-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-main);
  margin-bottom: 0.4rem;
}

.form-control, .form-select {
  width: 100%;
  padding: 0.65rem 1rem;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--color-text-main);
  background-color: 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-control:focus, .form-select:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.2);
}

.form-control::placeholder {
  color: var(--color-text-light);
}

.form-text {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.3rem;
}

.form-error {
  font-size: 0.825rem;
  color: var(--color-danger);
  margin-top: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: start;
}

.table th {
  background-color: var(--color-bg);
  padding: 0.85rem 1.25rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.table td {
  padding: 1rem 1.25rem;
  font-size: 0.925rem;
  color: var(--color-text-main);
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

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

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.775rem;
  font-weight: 700;
  border-radius: var(--radius-full);
}

.badge-success { background: var(--color-success-bg); color: var(--color-success); }
.badge-danger { background: var(--color-danger-bg); color: var(--color-danger); }
.badge-warning { background: var(--color-warning-bg); color: var(--color-secondary); }
.badge-info { background: var(--color-info-bg); color: var(--color-info); }
.badge-secondary { background: var(--color-bg); color: var(--color-text-muted); }

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

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
  border-radius: var(--radius-full);
  transition: width 0.4s ease;
}

/* Alerts */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.925rem;
  font-weight: 500;
}

.alert-success { background: var(--color-success-bg); color: #065F46; border: 1px solid #A7F3D0; }
.alert-error, .alert-danger { background: var(--color-danger-bg); color: #991B1B; border: 1px solid #FECACA; }
.alert-warning { background: var(--color-warning-bg); color: #92400E; border: 1px solid #FDE68A; }
.alert-info { background: var(--color-info-bg); color: #075985; border: 1px solid #BAE6FD; }

/* Dashboard Layout & Sidebar */
.dashboard-layout {
  display: flex;
  min-height: calc(100vh - var(--header-height));
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--color-surface);
  border-inline-end: 1px solid var(--color-border);
  padding: 1.5rem 1rem;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
}

.sidebar-menu {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  color: var(--color-text-main);
  font-weight: 600;
  font-size: 0.925rem;
  transition: all var(--transition-fast);
}

.sidebar-link i {
  font-size: 1.15rem;
  color: var(--color-text-muted);
}

.sidebar-link:hover, .sidebar-link.active {
  background-color: var(--color-bg);
  color: var(--color-accent-hover);
}

.sidebar-link:hover i, .sidebar-link.active i {
  color: var(--color-accent-hover);
}

.dashboard-content {
  flex-grow: 1;
  padding: 2rem 2.5rem;
  background-color: var(--color-bg);
  overflow-y: auto;
}

/* Page Header in Dashboards */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-primary);
}

.page-subtitle {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: #FFFFFF;
  padding: 5rem 0 6rem;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 680px;
}

.hero-title {
  color: #FFFFFF;
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.25rem;
}

.hero-title span {
  color: var(--color-accent);
}

.hero-desc {
  font-size: 1.2rem;
  color: #CBD5E1;
  margin-bottom: 2rem;
  line-height: 1.6;
}

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

/* Lesson Viewer Layout */
.lesson-player-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2rem;
  align-items: start;
  margin-top: 1.5rem;
}

.lesson-main-area {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.lesson-video-box {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.lesson-video-box iframe, .lesson-video-box video {
  width: 100%;
  height: 100%;
}

.lesson-nav-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.lesson-curriculum-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
  max-height: calc(100vh - var(--header-height) - 3rem);
  overflow-y: auto;
}

.curriculum-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.925rem;
  color: var(--color-text-main);
  text-decoration: none;
  transition: all var(--transition-fast);
  margin-bottom: 0.35rem;
}

.curriculum-item:hover {
  background: var(--color-bg);
  color: var(--color-accent-hover);
}

.curriculum-item.active {
  background: var(--color-accent-light);
  color: var(--color-accent-hover);
  font-weight: 700;
}

.curriculum-item.completed i {
  color: var(--color-success);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 3.5rem 1.5rem;
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
}

.empty-state-icon {
  width: 72px;
  height: 72px;
  margin-inline: auto;
  background: var(--color-bg);
  color: var(--color-text-light);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 1rem;
}

.empty-state-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.empty-state-text {
  color: var(--color-text-muted);
  max-width: 420px;
  margin-inline: auto;
  margin-bottom: 1.5rem;
}

/* Site Footer */
.site-footer {
  margin-top: auto;
  background: var(--color-primary-dark);
  color: #94A3B8;
  padding: 4rem 0 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  color: #FFFFFF;
  margin-bottom: 1.25rem;
  font-size: 1.1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-links a {
  color: #94A3B8;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.875rem;
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .dashboard-layout {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    border-inline-end: none;
    border-bottom: 1px solid var(--color-border);
  }
  .lesson-player-layout {
    grid-template-columns: 1fr;
  }
  .lesson-curriculum-panel {
    position: static;
    max-height: none;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.2rem;
  }
  .nav-links {
    display: none;
  }
  .dashboard-content {
    padding: 1.25rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}
/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-primary);
  font-size: 1.45rem;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
}

@media (max-width: 991px) {
  .mobile-menu-btn {
    display: inline-flex !important;
  }
  .navbar {
    position: relative;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #ffffff;
    border-bottom: 3px solid var(--color-accent);
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.15);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1.25rem;
    gap: 0.4rem;
    z-index: 1000;
  }
  .nav-links.active {
    display: flex !important;
  }
}

@media (max-width: 768px) {
  div[style*="grid-template-columns: 2fr 1fr"],
  div[style*="grid-template-columns: 1fr 1fr"],
  div[style*="grid-template-columns: repeat(auto-fill, minmax(320px, 1fr))"] {
    grid-template-columns: 1fr !important;
  }
  .stats-strip {
    grid-template-columns: 1fr 1fr !important;
  }
}

@media (max-width: 480px) {
  .stats-strip {
    grid-template-columns: 1fr !important;
  }
  .navbar-brand span:last-child {
    display: none;
  }
}