/* 
 * ARSCO Platform - Main Stylesheet
 * Color scheme based on ARSCO brand identity
 */

/* =====================
   CSS Variables (Theme)
   ===================== */
:root {
  /* Primary Colors - Teal/Cyan family */
  --primary: #2B9EB3;
  --primary-dark: #1B4B5A;
  --primary-light: #4DB8C9;
  --primary-lighter: #E8F6F8;
  
  /* Accent Colors */
  --accent: #E85A5A;
  --accent-dark: #C94444;
  --accent-light: #FF7B7B;
  
  /* Neutrals */
  --white: #FFFFFF;
  --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 */
  --success: #10B981;
  --warning: #F59E0B;
  --error: #EF4444;
  --info: #3B82F6;
  
  /* Typography */
  --font-arabic: 'Noto Sans Arabic', 'Segoe UI', Tahoma, sans-serif;
  --font-english: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
}

/* =====================
   Base Styles
   ===================== */
*, *::before, *::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-arabic);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--gray-800);
  background-color: var(--gray-50);
}

/* RTL Support */
[dir="rtl"] body,
body.rtl {
  direction: rtl;
  text-align: right;
}

[dir="ltr"] body,
body.ltr {
  direction: ltr;
  text-align: left;
  font-family: var(--font-english);
}

/* =====================
   Typography
   ===================== */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--spacing-md);
  font-weight: 700;
  line-height: 1.3;
  color: var(--gray-900);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin: 0 0 var(--spacing-md);
}

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

a:hover {
  color: var(--primary-dark);
}

/* =====================
   Layout Components
   ===================== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--spacing-lg);
}

/* =====================
   Header / Navigation
   ===================== */
.header {
  background-color: var(--white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-top {
  background-color: var(--primary);
  color: var(--white);
  padding: var(--spacing-sm) 0;
  font-size: 0.875rem;
}

.header-top a {
  color: var(--white);
}

.header-top a:hover {
  text-decoration: underline;
}

.header-main {
  padding: var(--spacing-md) 0;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo img {
  height: 50px;
  width: auto;
}

.logo-text {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--primary-dark);
}

.logo-subtitle {
  font-size: 0.75rem;
  color: var(--gray-500);
}

/* Navigation */
.nav-main {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--gray-700);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.nav-link.active {
  color: var(--primary);
  font-weight: 600;
}

/* Search Icon */
.search-toggle {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 1.25rem;
  padding: var(--spacing-sm);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast);
}

.search-toggle:hover {
  background-color: var(--gray-100);
}

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--gray-700);
  cursor: pointer;
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }
  
  .nav-main {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
  }
  
  .nav-main.active {
    display: flex;
  }
  
  .nav-links {
    flex-direction: column;
    width: 100%;
  }
  
  .nav-link {
    width: 100%;
    text-align: center;
  }
}

/* =====================
   Hero Section
   ===================== */
.hero {
  position: relative;
  min-height: 400px;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: var(--white);
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 600px;
}

.hero-title {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-lg);
  color: var(--white);
}

.hero-subtitle {
  font-size: 1.25rem;
  opacity: 0.9;
  margin-bottom: var(--spacing-xl);
}

/* =====================
   Search Bar (UOI)
   ===================== */
.search-container {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-md);
  max-width: 800px;
  margin: var(--spacing-xl) auto;
}

.search-form {
  display: flex;
  gap: var(--spacing-sm);
}

.search-input {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
}

.search-input::placeholder {
  color: var(--gray-400);
}

.search-btn {
  padding: var(--spacing-md) var(--spacing-xl);
  background-color: var(--primary);
  color: var(--white);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.search-btn:hover {
  background-color: var(--primary-dark);
}

.search-filters {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  flex-wrap: wrap;
}

.filter-chip {
  padding: var(--spacing-xs) var(--spacing-md);
  background-color: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  color: var(--gray-600);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-chip:hover,
.filter-chip.active {
  background-color: var(--primary-lighter);
  border-color: var(--primary);
  color: var(--primary);
}

/* =====================
   Cards
   ===================== */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: var(--gray-100);
}

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

.card-title {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
  color: var(--gray-900);
}

.card-text {
  color: var(--gray-600);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: 0.75rem;
  color: var(--gray-500);
}

.card-type {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--primary-lighter);
  color: var(--primary);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
}

/* Resource Cards Grid */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

/* Featured Cards (larger) */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xl);
}

.featured-card {
  position: relative;
  min-height: 300px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.featured-card-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}

.featured-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.2) 100%);
}

.featured-card-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-xl);
  color: var(--white);
}

.featured-card-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--white);
}

.featured-card-subtitle {
  font-size: 0.875rem;
  opacity: 0.9;
  margin-bottom: var(--spacing-md);
}

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

/* =====================
   Buttons
   ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 500;
  font-family: inherit;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
}

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

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

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

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

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

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

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.875rem;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.125rem;
}

/* =====================
   Forms
   ===================== */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--gray-700);
}

.form-control {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(43, 158, 179, 0.1);
}

.form-control.is-invalid {
  border-color: var(--error);
}

.invalid-feedback {
  color: var(--error);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
}

/* =====================
   Alerts / Messages
   ===================== */
.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
}

.alert-success {
  background-color: #D1FAE5;
  color: #065F46;
  border: 1px solid #A7F3D0;
}

.alert-error {
  background-color: #FEE2E2;
  color: #991B1B;
  border: 1px solid #FECACA;
}

.alert-warning {
  background-color: #FEF3C7;
  color: #92400E;
  border: 1px solid #FDE68A;
}

.alert-info {
  background-color: #DBEAFE;
  color: #1E40AF;
  border: 1px solid #BFDBFE;
}

/* =====================
   AI Response Panel
   ===================== */
.ai-response {
  background: linear-gradient(135deg, var(--primary-lighter) 0%, var(--white) 100%);
  border: 1px solid var(--primary-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.ai-response-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.ai-icon {
  width: 32px;
  height: 32px;
  background-color: var(--primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
}

.ai-response-title {
  font-weight: 600;
  color: var(--primary-dark);
}

.ai-response-content {
  color: var(--gray-700);
  line-height: 1.8;
}

.ai-confidence {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
  font-size: 0.875rem;
  color: var(--gray-500);
}

.confidence-high { color: var(--success); }
.confidence-medium { color: var(--warning); }
.confidence-low { color: var(--error); }

.ai-sources {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--gray-200);
}

.ai-sources-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-600);
  margin-bottom: var(--spacing-sm);
}

.source-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--gray-600);
  margin-left: var(--spacing-xs);
  margin-bottom: var(--spacing-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.source-chip:hover {
  background-color: var(--primary-lighter);
  border-color: var(--primary);
  color: var(--primary);
}

/* Citation references in AI answer */
.source-ref {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.25rem;
  height: 1.25rem;
  padding: 0 0.25rem;
  background: var(--primary);
  color: var(--white);
  border-radius: 3px;
  font-size: 0.7rem;
  font-weight: 600;
  text-decoration: none;
  margin: 0 0.125rem;
  cursor: pointer;
  transition: all 0.2s;
}

.source-ref:hover {
  background: var(--primary-dark);
  transform: scale(1.1);
}

/* Card badge for numbered sources */
.card-badge {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: var(--primary);
  color: var(--white);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: bold;
  z-index: 1;
}

.card {
  position: relative;
}

/* =====================
   Stats Section
   ===================== */
.stats-section {
  background-color: var(--primary-dark);
  color: var(--white);
  padding: var(--spacing-2xl) 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
  text-align: center;
}

.stat-item {
  padding: var(--spacing-lg);
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  font-size: 1rem;
  opacity: 0.9;
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* =====================
   Footer
   ===================== */
.footer {
  background-color: var(--gray-900);
  color: var(--gray-300);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-title {
  color: var(--white);
  font-size: 1.125rem;
  margin-bottom: var(--spacing-lg);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--gray-400);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--gray-700);
  text-align: center;
  font-size: 0.875rem;
  color: var(--gray-500);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* =====================
   Utility Classes
   ===================== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

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

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

.py-1 { padding-top: var(--spacing-sm); padding-bottom: var(--spacing-sm); }
.py-2 { padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }
.py-3 { padding-top: var(--spacing-lg); padding-bottom: var(--spacing-lg); }
.py-4 { padding-top: var(--spacing-xl); padding-bottom: var(--spacing-xl); }

.d-flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-md); }
.gap-3 { gap: var(--spacing-lg); }

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

/* Loading Spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* =====================
   Dark Mode (Optional)
   ===================== */
@media (prefers-color-scheme: dark) {
  .dark-mode {
    --gray-50: #111827;
    --gray-100: #1F2937;
    --gray-200: #374151;
    --gray-300: #4B5563;
    --gray-400: #6B7280;
    --gray-500: #9CA3AF;
    --gray-600: #D1D5DB;
    --gray-700: #E5E7EB;
    --gray-800: #F3F4F6;
    --gray-900: #F9FAFB;
  }
}

/* ── Dropdown Navigation ────────────────────────── */
.nav-dropdown {
    position: relative;
}
.nav-dropdown .dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 25px rgba(0,0,0,.12);
    min-width: 220px;
    padding: 0.5rem 0;
    z-index: 100;
    list-style: none;
}
.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu {
    display: block;
}
.dropdown-menu li a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    color: var(--gray-700);
    text-decoration: none;
    transition: background 0.15s;
    white-space: nowrap;
}
.dropdown-menu li a:hover {
    background: var(--primary-lighter, #e6f7f9);
    color: var(--primary);
}
/* RTL fix */
[dir="rtl"] .dropdown-menu {
    right: 0;
    left: auto;
}
[dir="ltr"] .dropdown-menu {
    left: 0;
    right: auto;
}
/* Mobile: flatten dropdowns */
@media (max-width: 768px) {
    .nav-dropdown .dropdown-menu {
        position: static;
        box-shadow: none;
        background: var(--gray-50);
        border-radius: 0;
        padding: 0;
    }
    .nav-main.active .nav-dropdown .dropdown-menu {
        display: block;
    }
}

/* Wide dropdown (for Subjects with 10 items) */
.dropdown-menu-wide {
    min-width: 280px;
    max-height: 400px;
    overflow-y: auto;
}
.dropdown-menu-wide li a {
    font-size: 0.88rem;
    padding: 0.4rem 1rem;
}

/* LTR body font override */
body.ltr, [dir="ltr"] body {
    font-family: var(--font-english);
}
body.ltr .hero-title,
body.ltr .hero-subtitle,
body.ltr h1, body.ltr h2, body.ltr h3, body.ltr h4 {
    font-family: var(--font-english);
}

/* Active language indicator in header */
.header-top a.active {
    font-weight: 700;
    text-decoration: underline;
}

/* ── Homepage grid responsiveness ── */
@media (max-width: 768px) {
    /* Subjects: 4 → 3 columns on tablet */
    .subjects-grid { grid-template-columns: repeat(3, 1fr) !important; }
    /* Centres: 3 → 2 columns on tablet */
    .centres-grid  { grid-template-columns: repeat(2, 1fr) !important; }
}
@media (max-width: 480px) {
    /* Subjects: 3 → 2 columns on phone */
    .subjects-grid { grid-template-columns: repeat(2, 1fr) !important; }
    /* Centres: stay 2 */
    .centres-grid  { grid-template-columns: repeat(2, 1fr) !important; }
}