/* ============================================
   الملف: styles.css
   الوصف: ملف التنسيقات الرئيسي
   ============================================ */

/* ===== 1. المتغيرات العامة ===== */
:root {
  --color-gold: #c9a14b;
  --color-gold-dark: #b68a3a;
  --color-gold-light: #e2c084;
  --color-gold-glow: rgba(201, 161, 75, 0.4);
  
  --color-blue-deep: #0a2538;
  --color-blue-medium: #1f4a6e;
  --color-blue-light: #e8f0fe;
  
  --color-white: #ffffff;
  --color-white-soft: #f8fafd;
  --color-gray-light: #f0f5fa;
  --color-gray-medium: #6b7c93;
  --color-gray-dark: #4a5568;
  --color-error: #dc3545;
  --color-success: #28a745;
  
  --shadow-xs: 0 2px 8px -4px rgba(0, 20, 40, 0.1);
  --shadow-sm: 0 5px 15px -8px rgba(0, 20, 40, 0.15);
  --shadow-md: 0 10px 25px -12px rgba(10, 37, 56, 0.2);
  --shadow-lg: 0 20px 40px -15px rgba(10, 37, 56, 0.25);
  --shadow-xl: 0 25px 50px -20px rgba(10, 37, 56, 0.3);
  --shadow-gold: 0 10px 30px -10px var(--color-gold-glow);
  
  --transition-fast: all 0.2s ease;
  --transition-normal: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-slow: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 40px;
  --radius-full: 9999px;
  
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-2xl: 96px;
  
  --font-primary: 'Tajawal', 'Cairo', sans-serif;
  --font-secondary: 'Playfair Display', serif;
  
  --header-height: 70px;
  --container-max: 1200px;
}

/* ===== 2. إعادة التعيين والأساسيات ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  background: var(--color-gray-light);
  color: var(--color-blue-deep);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: var(--transition-fast); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.hidden { display: none !important; }

/* ===== 3. الهيدر ===== */
.main-header {
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid rgba(201, 161, 75, 0.15);
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
}

.header-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.logo-section {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-secondary);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-blue-deep);
}

.logo i { color: var(--color-gold); font-size: 1.8rem; }
.logo-subtitle { font-size: 0.85rem; color: var(--color-gray-medium); font-weight: 500; }

.main-nav { display: flex; gap: var(--space-sm); }

.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-weight: 600;
  color: var(--color-blue-deep);
  transition: var(--transition-normal);
}

.nav-link:hover, .nav-link.active {
  background: var(--color-blue-light);
  color: var(--color-blue-medium);
}

.nav-link i { color: var(--color-gold); }

.mobile-menu-btn { display: none; font-size: 1.5rem; color: var(--color-blue-deep); padding: 8px; cursor: pointer; }

/* ===== 4. الأزرار ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.95rem;
  transition: var(--transition-normal);
  white-space: nowrap;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--color-gold);
  color: var(--color-blue-deep);
  border-color: var(--color-gold);
}

.btn-primary:hover {
  background: transparent;
  color: var(--color-gold);
  transform: translateY(-3px);
  box-shadow: var(--shadow-gold);
}

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

.btn-outline:hover {
  background: var(--color-gold);
  color: var(--color-blue-deep);
  transform: translateY(-3px);
  box-shadow: var(--shadow-gold);
}

.btn-lg { padding: 14px 32px; font-size: 1.1rem; }

/* ===== 5. قسم البطل ===== */
.hero-section {
  position: relative;
  background: linear-gradient(145deg, #d9d2c0 0%, #e5decc 50%, #f0e9d5 100%);
  padding: var(--space-2xl) 0 var(--space-xl);
  overflow: hidden;
}

.hero-background { position: absolute; inset: 0; pointer-events: none; }

.hero-pattern {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 20% 30%, rgba(201,161,75,0.08) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(10,37,56,0.05) 0%, transparent 40%);
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  25% { transform: translate(2%, 2%); }
  50% { transform: translate(0, 4%); }
  75% { transform: translate(-2%, 2%); }
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(255,255,255,0.5) 100%);
}

.hero-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-image { display: flex; justify-content: center; align-items: center; position: relative; }

.image-frame { position: relative; width: 280px; height: 280px; }

.teacher-photo {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 5px solid var(--color-gold);
  box-shadow: var(--shadow-xl);
  transition: var(--transition-slow);
  background: var(--color-white);
  padding: 5px;
}

.teacher-photo:hover {
  transform: scale(1.05) rotate(3deg);
  box-shadow: var(--shadow-gold), 0 0 0 10px rgba(201,161,75,0.1);
}

.image-decoration {
  position: absolute;
  inset: -20px;
  border: 3px dashed var(--color-gold);
  border-radius: 50%;
  animation: rotate 30s linear infinite;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.experience-badge {
  position: absolute;
  bottom: 20px;
  right: 0;
  background: var(--color-gold);
  color: var(--color-blue-deep);
  padding: 12px 20px;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

.badge-number { display: block; font-size: 1.8rem; font-weight: 900; line-height: 1; }
.badge-text { font-size: 0.85rem; font-weight: 600; }

.hero-content { text-align: right; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(201,161,75,0.15);
  color: var(--color-gold-dark);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: var(--space-md);
}

.hero-badge i { color: var(--color-gold); }

.hero-title {
  font-family: var(--font-secondary);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.2;
  color: var(--color-blue-deep);
  margin-bottom: var(--space-xs);
}

.hero-title .highlight { color: var(--color-gold); display: block; }

.hero-subtitle {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 700;
  color: var(--color-blue-medium);
  margin-bottom: var(--space-md);
}

.hero-description {
  font-size: 1.1rem;
  color: var(--color-gray-dark);
  margin-bottom: var(--space-lg);
  padding: var(--space-md);
  background: rgba(255,255,255,0.6);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(201,161,75,0.2);
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.hero-description i { color: var(--color-gold); font-size: 1.3rem; margin-top: 3px; }

.hero-actions { display: flex; gap: var(--space-md); flex-wrap: wrap; }

.hero-wave { position: absolute; bottom: 0; left: 0; right: 0; line-height: 0; }
.hero-wave svg { width: 100%; height: 80px; }
.hero-wave path { fill: var(--color-white); }

/* ===== 6. قسم المميزات ===== */
.features-section { background: var(--color-white); padding: var(--space-2xl) 0; }

.section-header { text-align: center; margin-bottom: var(--space-xl); }

.section-title {
  font-family: var(--font-secondary);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 900;
  color: var(--color-blue-deep);
  margin-bottom: var(--space-sm);
}

.section-subtitle { font-size: 1.1rem; color: var(--color-gray-medium); max-width: 600px; margin: 0 auto; }

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
}

.feature-card {
  background: var(--color-white-soft);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  transition: var(--transition-slow);
  border: 1px solid rgba(201,161,75,0.1);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-gold);
  border-color: var(--color-gold);
}

.feature-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-md);
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--color-blue-deep);
  transition: var(--transition-slow);
}

.feature-card:hover .feature-icon { transform: scale(1.1) rotate(5deg); }

.feature-card h3 { font-size: 1.3rem; font-weight: 800; color: var(--color-blue-deep); margin-bottom: var(--space-xs); }
.feature-card p { color: var(--color-gray-medium); font-size: 0.95rem; line-height: 1.6; }

/* ===== 7. البطاقات الرئيسية ===== */
.main-content { padding: var(--space-xl) 0; }

.choices-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  max-width: 800px;
  margin: 0 auto;
}

.choice-card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  text-align: center;
  cursor: pointer;
  transition: var(--transition-slow);
  border: 1px solid rgba(201,161,75,0.1);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  display: block;
}

.choice-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-gold-light), var(--color-gold));
  transform: scaleX(0);
  transition: transform 0.4s ease;
  transform-origin: right;
}

.choice-card:hover::before { transform: scaleX(1); transform-origin: left; }

.choice-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: var(--shadow-gold), var(--shadow-xl);
  border-color: var(--color-gold);
}

.card-image-wrapper { position: relative; width: 130px; height: 130px; margin: 0 auto var(--space-md); }

.card-image {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-gold);
  transition: var(--transition-slow);
  background: var(--color-white);
  padding: 4px;
}

.choice-card:hover .card-image { transform: scale(1.08) rotate(5deg); box-shadow: var(--shadow-gold); }

.card-overlay {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: rgba(201,161,75,0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition-normal);
}

.card-overlay i {
  color: var(--color-white);
  font-size: 2rem;
  transform: translateX(20px);
  transition: var(--transition-normal);
}

.choice-card:hover .card-overlay { opacity: 1; }
.choice-card:hover .card-overlay i { transform: translateX(0); }

.card-content h2 {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--color-blue-deep);
  margin-bottom: var(--space-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.card-content h2 i { color: var(--color-gold); }
.card-content p { color: var(--color-gray-medium); font-weight: 600; margin-bottom: var(--space-sm); }

.card-tag {
  display: inline-block;
  background: var(--color-gold);
  color: var(--color-blue-deep);
  padding: 4px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
}

/* ===== 8. الصفحات ===== */
.page-section { padding: var(--space-xl) 0; min-height: 60vh; }
.page-container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-md); }
.page-header { text-align: center; margin-bottom: var(--space-xl); }

.back-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-gray-medium);
  font-weight: 600;
  margin-bottom: var(--space-md);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
  cursor: pointer;
}

.back-button:hover { color: var(--color-gold); background: rgba(201,161,75,0.1); }

.page-title {
  font-family: var(--font-secondary);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  color: var(--color-blue-deep);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.page-title i { color: var(--color-gold); }
.page-description { color: var(--color-gray-medium); font-size: 1.1rem; }

/* ===== 9. شبكة الكتب ===== */
.books-filter { display: flex; justify-content: center; gap: var(--space-sm); flex-wrap: wrap; margin-bottom: var(--space-lg); }

.filter-btn {
  padding: 10px 24px;
  border-radius: var(--radius-full);
  background: var(--color-white);
  border: 2px solid rgba(201,161,75,0.2);
  color: var(--color-blue-deep);
  font-weight: 700;
  transition: var(--transition-normal);
  cursor: pointer;
}

.filter-btn:hover, .filter-btn.active {
  background: var(--color-gold);
  border-color: var(--color-gold);
  color: var(--color-blue-deep);
}

.books-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: var(--space-md); }

.book-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  text-align: center;
  border: 1px solid rgba(201,161,75,0.1);
  transition: var(--transition-slow);
  animation: fadeInUp 0.5s ease;
}

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

.book-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-gold); border-color: var(--color-gold); }

.book-card img {
  width: 100%;
  max-width: 140px;
  aspect-ratio: 3/4;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin: 0 auto var(--space-sm);
  border: 3px solid var(--color-white);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-slow);
}

.book-card:hover img { transform: scale(1.05) rotate(2deg); border-color: var(--color-gold); }

.book-card h4 { font-size: 1rem; font-weight: 800; color: var(--color-blue-deep); margin-bottom: 4px; }
.book-card p { color: var(--color-gray-medium); font-size: 0.9rem; margin-bottom: var(--space-sm); }

.book-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-gold);
  color: var(--color-blue-deep);
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 700;
  transition: var(--transition-normal);
  cursor: pointer;
  border: 2px solid transparent;
  text-decoration: none;
}

.book-download:hover { 
  background: transparent; 
  border: 2px solid var(--color-gold); 
  color: var(--color-gold); 
  transform: scale(1.05); 
}

/* ===== 10. مراحل الفيديوهات ===== */
.stage-selector { display: flex; justify-content: center; gap: var(--space-md); flex-wrap: wrap; margin-bottom: var(--space-xl); }

.stage-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  background: var(--color-white);
  border: 2px solid rgba(201,161,75,0.2);
  color: var(--color-blue-deep);
  font-weight: 700;
  font-size: 1.05rem;
  transition: var(--transition-slow);
  text-decoration: none;
}

.stage-btn i { color: var(--color-gold); font-size: 1.2rem; transition: var(--transition-normal); }

.stage-btn:hover {
  background: var(--color-gold);
  border-color: var(--color-gold);
  color: var(--color-blue-deep);
  transform: translateY(-4px);
  box-shadow: var(--shadow-gold);
}

.stage-btn:hover i { color: var(--color-blue-deep); transform: scale(1.2) rotate(10deg); }

/* ===== 11. صفحة الفيديو المنفصلة ===== */
.videos-page {
  padding: var(--space-xl) 0;
  min-height: 60vh;
}

.videos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.video-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-slow);
  border: 1px solid rgba(201,161,75,0.1);
  box-shadow: var(--shadow-sm);
}

.video-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-gold);
  border-color: var(--color-gold);
}

.video-thumbnail {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  overflow: hidden;
}

.video-thumbnail img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-slow);
}

.video-card:hover .video-thumbnail img {
  transform: scale(1.05);
}

.play-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: rgba(201,161,75,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-normal);
}

.play-overlay i {
  color: var(--color-blue-deep);
  font-size: 1.8rem;
}

.video-card:hover .play-overlay {
  transform: translate(-50%, -50%) scale(1.1);
}

.video-info {
  padding: var(--space-md);
}

.video-info h3 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-blue-deep);
  margin-bottom: var(--space-xs);
}

.video-info p {
  color: var(--color-gray-medium);
  font-size: 0.9rem;
  margin-bottom: var(--space-sm);
}

.video-duration {
  display: inline-block;
  background: rgba(201,161,75,0.15);
  color: var(--color-gold-dark);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
}

/* ===== 12. التذييل ===== */
.main-footer {
  background: linear-gradient(135deg, var(--color-blue-deep), var(--color-blue-medium));
  color: var(--color-white);
  padding: var(--space-2xl) 0 var(--space-lg);
  margin-top: auto;
}

.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-lg);
}

.footer-section {
  text-align: center;
  max-width: 600px;
}

.footer-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  font-family: var(--font-secondary);
  font-size: 1.5rem;
  font-weight: 900;
  margin-bottom: var(--space-md);
}

.footer-logo i { color: var(--color-gold); }

.footer-description {
  color: rgba(255,255,255,0.8);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.footer-social {
  display: flex;
  gap: var(--space-xs);
  justify-content: center;
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gold);
  font-size: 1.1rem;
  transition: var(--transition-normal);
}

.footer-social a:hover {
  background: var(--color-gold);
  color: var(--color-blue-deep);
  transform: translateY(-3px);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-bottom p { color: rgba(255,255,255,0.7); font-size: 0.9rem; }

/* ===== 13. زر الصعود للأعلى ===== */
.scroll-top {
  position: fixed;
  bottom: 30px;
  left: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-gold);
  color: var(--color-blue-deep);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
  z-index: 999;
  cursor: pointer;
}

.scroll-top.visible { opacity: 1; visibility: visible; }
.scroll-top:hover { background: var(--color-blue-deep); color: var(--color-gold); transform: translateY(-5px); }

/* ===== 14. القائمة الجانبية للجوال ===== */
.mobile-sidebar {
  position: fixed;
  top: 0;
  right: -280px;
  width: 280px;
  height: 100vh;
  background: var(--color-white);
  box-shadow: var(--shadow-xl);
  z-index: 2000;
  transition: var(--transition-slow);
}

.mobile-sidebar.active { right: 0; }

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md);
  border-bottom: 1px solid rgba(201,161,75,0.1);
}

.sidebar-header h3 { font-size: 1.2rem; font-weight: 800; color: var(--color-blue-deep); }
.close-sidebar { font-size: 1.5rem; color: var(--color-gray-medium); padding: 4px; cursor: pointer; }
.close-sidebar:hover { color: var(--color-error); }

.sidebar-nav { padding: var(--space-md); }

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  color: var(--color-blue-deep);
  font-weight: 600;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-xs);
  transition: var(--transition-fast);
  text-decoration: none;
}

.sidebar-nav a:hover { background: var(--color-blue-light); color: var(--color-blue-medium); }
.sidebar-nav a i { color: var(--color-gold); width: 20px; }

.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

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

/* ===== 15. التجاوب ===== */
@media (max-width: 1024px) {
  .hero-container { grid-template-columns: 1fr; text-align: center; }
  .hero-content { text-align: center; }
  .hero-description { justify-content: center; }
  .hero-actions { justify-content: center; }
  .main-nav { display: none; }
  .mobile-menu-btn { display: block; }
}

@media (max-width: 768px) {
  :root { --header-height: 60px; --space-2xl: 48px; --space-xl: 32px; }
  .header-container { padding: 0 var(--space-sm); }
  .logo { font-size: 1.3rem; }
  .hero-section { padding: var(--space-xl) 0; }
  .image-frame { width: 220px; height: 220px; }
  .hero-title { font-size: 2rem; }
  .hero-subtitle { font-size: 1.3rem; }
  .choices-section { grid-template-columns: 1fr; }
  .books-grid { grid-template-columns: repeat(2, 1fr); }
  .stage-selector { flex-direction: column; align-items: center; }
  .stage-btn { width: 100%; max-width: 300px; justify-content: center; }
  .scroll-top { bottom: 20px; left: 20px; width: 45px; height: 45px; }
  .videos-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .books-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; width: 100%; }
  .btn-lg { width: 100%; }
  .features-grid { grid-template-columns: 1fr; }
}

/* ===== 16. إمكانية الوصول ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

:focus-visible { outline: 3px solid var(--color-gold); outline-offset: 2px; }
button:focus-visible, a:focus-visible, input:focus-visible { outline: 3px solid var(--color-gold); outline-offset: 2px; }