/* =====================================================
   THEME V4 - MODERN, PREMIUM LANDING PAGE
   Next-Generation Design System
   ===================================================== */

/* ROOT VARIABLES */
:root {
  --primary-dark: #0f3460;
  --primary: #1866d4;
  --primary-light: #3b82f6;
  --secondary: #580ce3;
  --accent: #ff6b35;
  --accent-light: #ff8c5a;
  --success: #10b981;
  --text-dark: #0f172a;
  --text-secondary: #64748b;
  --text-light: #94a3b8;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --border: #e2e8f0;
  --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 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 50px -15px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* GLOBAL STYLES */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-dark);
  background: var(--bg-primary);
  overflow-x: hidden;
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.2;
}

h1 { font-size: 3.5rem; letter-spacing: -1px; }
h2 { font-size: 2.5rem; letter-spacing: -0.5px; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }

p {
  color: var(--text-secondary);
  line-height: 1.7;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 40px 20px;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-size: 15px;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(24, 102, 212, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(24, 102, 212, 0.4);
}

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

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

.btn-light {
  background: white;
  color: var(--primary);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

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

.btn-sm {
  padding: 8px 20px;
  font-size: 14px;
}

.btn-lg {
  padding: 16px 40px;
  font-size: 16px;
}

/* ============ HEADER ============ */
.header-area {
  padding: 16px 0;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: var(--transition);
}

.header-area.scrolled {
  box-shadow: var(--shadow-md);
  padding: 12px 0;
}

.header-area-three {
  padding: 16px 0;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: var(--transition);
}

.header-area-three.scrolled {
  box-shadow: var(--shadow-md);
  padding: 12px 0;
}

/* Logo sizing */
.logo-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-wrapper img {
  height: 45px;
  width: auto;
}

/* ============ HERO SECTION ============ */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 120px 0;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, 
    rgba(15, 52, 96, 0.95) 0%,
    rgba(24, 102, 212, 0.9) 50%,
    rgba(88, 12, 227, 0.9) 100%);
  z-index: 0;
}

.hero-section::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 1;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.03)" fill-opacity="1" d="M0,64L80,80C160,96,320,128,480,144C640,160,800,160,960,144C1120,128,1280,96,1360,80L1440,64L1440,320L1360,320C1280,320,1120,320,960,320C800,320,640,320,480,320C320,320,160,320,80,320L0,320Z"></path></svg>');
  background-repeat: no-repeat;
  background-position: bottom;
  background-size: cover;
  z-index: 1;
}

.hero-wrapper {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  color: white;
  animation: slideInLeft 1s ease-out;
}

.hero-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: rgba(255, 255, 255, 0.95);
  padding: 10px 16px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  color: white;
}

.hero-subtitle {
  font-size: 1.25rem;
  line-height: 1.7;
  margin-bottom: 32px;
  color: rgba(255, 255, 255, 0.9);
  max-width: 500px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-image {
  position: relative;
  height: 450px;
  animation: slideInRight 1s ease-out;
}

.floating-card {
  position: relative;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.12) 0%, rgba(255, 255, 255, 0.08) 100%);
  backdrop-filter: blur(20px);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: 24px;
  animation: float 6s ease-in-out infinite;
}

/* ============ SEARCH SECTION ============ */
.search-section {
  margin-top: -80px;
  position: relative;
  z-index: 10;
  padding: 60px 0;
}

.search-card {
  background: var(--bg-primary);
  border-radius: 16px;
  padding: 40px;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border);
  animation: slideUp 0.8s ease-out;
}

.search-title {
  text-align: center;
  font-size: 1.75rem;
  margin-bottom: 32px;
  color: var(--text-dark);
}

.search-input-group {
  display: grid;
  grid-template-columns: 2fr 1.5fr 200px;
  gap: 16px;
  align-items: flex-end;
}

.search-field {
  position: relative;
  display: flex;
  flex-direction: column;
}

.search-field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.search-field i {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
  font-size: 16px;
}

.search-input,
.search-select {
  width: 100%;
  padding: 12px 16px 12px 44px;
  border: 2px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
  background: var(--bg-secondary);
  transition: var(--transition);
}

.search-input:focus,
.search-select:focus {
  border-color: var(--primary);
  background: var(--bg-primary);
  box-shadow: 0 0 0 4px rgba(24, 102, 212, 0.1);
  outline: none;
}

.search-section .btn {
  width: 100%;
  justify-content: center;
}

/* ============ CATEGORIES SECTION ============ */
.categories-section {
  padding: 120px 0;
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
}

.category-card {
  background: var(--bg-primary);
  border-radius: 16px;
  padding: 32px 24px;
  text-align: center;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  border: 2px solid transparent;
  transition: var(--transition);
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
  box-shadow: var(--shadow-md);
}

.category-card[data-delay="0"] { animation-delay: 0s; }
.category-card[data-delay="100"] { animation-delay: 0.1s; }
.category-card[data-delay="200"] { animation-delay: 0.2s; }
.category-card[data-delay="300"] { animation-delay: 0.3s; }

.category-card:hover {
  transform: translateY(-12px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(24, 102, 212, 0.05) 0%, rgba(88, 12, 227, 0.05) 100%);
}

.category-icon {
  font-size: 3.5rem;
  transition: var(--transition);
}

.category-card:hover .category-icon {
  transform: scale(1.15) rotate(10deg);
}

.category-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-dark);
}

.category-arrow {
  opacity: 0;
  transform: translateX(-10px);
  transition: var(--transition);
  font-size: 1.25rem;
  color: var(--accent);
}

.category-card:hover .category-arrow {
  opacity: 1;
  transform: translateX(5px);
}

/* ============ CTA SECTION ============ */
.cta-section {
  position: relative;
  padding: 100px 0;
  background: linear-gradient(135deg, 
    rgba(15, 52, 96, 0.95) 0%,
    rgba(24, 102, 212, 0.9) 50%,
    rgba(88, 12, 227, 0.9) 100%);
  overflow: hidden;
  margin: 100px 0;
  border-radius: 24px;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-content {
  position: relative;
  z-index: 2;
  color: white;
  text-align: center;
}

.cta-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: white;
  padding: 10px 16px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.cta-title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 28px;
  line-height: 1.2;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============ FEATURED COURSES SECTION ============ */
.featured-courses-section {
  padding: 120px 0;
  background: var(--bg-primary);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 32px;
}

.course-card {
  background: var(--bg-primary);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
  box-shadow: var(--shadow-md);
}

.course-card[data-delay="0"] { animation-delay: 0s; }
.course-card[data-delay="100"] { animation-delay: 0.1s; }
.course-card[data-delay="200"] { animation-delay: 0.2s; }

.course-card:hover {
  transform: translateY(-16px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.course-image {
  position: relative;
  height: 220px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
}

.course-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.course-card:hover .course-image img {
  transform: scale(1.08);
}

.course-overlay {
  position: absolute;
  inset: 0;
  background: rgba(24, 102, 212, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.course-card:hover .course-overlay {
  opacity: 1;
}

.course-category-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--accent);
  border-radius: 20px;
  z-index: 2;
}

.course-category-badge a {
  display: block;
  color: white;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
}

.course-body {
  padding: 24px;
}

.course-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.course-title a {
  color: var(--text-dark);
  transition: var(--transition);
}

.course-title a:hover {
  color: var(--primary);
}

.course-instructor {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-secondary);
}

.instructor-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
}

.course-stats {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--text-light);
}

.course-stats .stat {
  display: flex;
  align-items: center;
  gap: 4px;
}

.course-footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
}

.course-rating {
  display: flex;
  align-items: center;
  gap: 6px;
}

.stars {
  display: flex;
  gap: 2px;
  color: #fbbf24;
  font-size: 13px;
}

.rating-value {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dark);
}

.course-price {
  text-align: right;
}

.price-current {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.price-original {
  display: block;
  font-size: 12px;
  color: var(--text-light);
  text-decoration: line-through;
  margin-top: 4px;
}

/* ============ FEATURES SECTION ============ */
.features-section {
  position: relative;
  padding: 120px 0;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  overflow: hidden;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}

.feature-card {
  padding: 32px;
  border-radius: 16px;
  color: white;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
  box-shadow: var(--shadow-lg);
}

.feature-card[data-delay="0"] { animation-delay: 0s; }
.feature-card[data-delay="100"] { animation-delay: 0.1s; }
.feature-card[data-delay="200"] { animation-delay: 0.2s; }

.feature-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 300px;
  height: 300px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-12px);
  box-shadow: var(--shadow-xl);
}

.feature-card:hover::before {
  top: -30%;
  right: -30%;
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.feature-text {
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.9);
  position: relative;
  z-index: 1;
}

/* ============ VIDEO SECTION ============ */
.video-section {
  padding: 120px 0;
  background: var(--bg-secondary);
}

.video-container {
  display: flex;
  justify-content: center;
}

.video-wrapper {
  position: relative;
  width: 100%;
  max-width: 800px;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.video-thumbnail {
  width: 100%;
  height: auto;
  display: block;
}

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90px;
  height: 90px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2.2rem;
  cursor: pointer;
  transition: var(--transition);
  z-index: 2;
  box-shadow: 0 10px 40px rgba(255, 107, 53, 0.3);
}

.video-play-btn:hover {
  transform: translate(-50%, -50%) scale(1.1);
  box-shadow: 0 15px 50px rgba(255, 107, 53, 0.4);
}

/* ============ STATS SECTION ============ */
.stats-section {
  position: relative;
  padding: 120px 0;
  background: linear-gradient(135deg, 
    rgba(15, 52, 96, 0.95) 0%,
    rgba(24, 102, 212, 0.9) 50%,
    rgba(88, 12, 227, 0.9) 100%);
  overflow: hidden;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px;
  position: relative;
  z-index: 1;
}

.stat-card {
  text-align: center;
  color: white;
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
}

.stat-card[data-delay="0"] { animation-delay: 0s; }
.stat-card[data-delay="100"] { animation-delay: 0.1s; }
.stat-card[data-delay="200"] { animation-delay: 0.2s; }
.stat-card[data-delay="300"] { animation-delay: 0.3s; }

.stat-value {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1;
  display: flex;
  align-items: baseline;
  justify-content: center;
}

.stat-label {
  font-size: 1.8rem;
  color: rgba(255, 255, 255, 0.8);
  margin-left: 4px;
}

.stat-text {
  font-size: 1rem;
  margin-top: 12px;
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
}

/* ============ TESTIMONIALS SECTION ============ */
.testimonials-section {
  position: relative;
  padding: 120px 0;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  overflow: hidden;
}

.testimonials-carousel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 32px;
}

.testimonial-card {
  background: var(--bg-primary);
  border-radius: 16px;
  padding: 32px;
  border: 1px solid var(--border);
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

.testimonial-card:hover {
  transform: translateY(-12px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.testimonial-stars {
  color: #fbbf24;
  font-size: 1rem;
  margin-bottom: 16px;
  display: flex;
  gap: 2px;
}

.testimonial-text {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-style: italic;
  border-left: 4px solid var(--primary);
  padding-left: 20px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border);
}

.author-info {
  flex: 1;
}

.author-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-dark);
  margin: 0;
}

.author-title {
  font-size: 0.85rem;
  color: var(--text-light);
}

/* ============ INSTRUCTORS SECTION ============ */
.instructors-section {
  padding: 120px 0;
  background: var(--bg-secondary);
}

.instructors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 32px;
}

.instructor-card {
  background: var(--bg-primary);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
  box-shadow: var(--shadow-md);
}

.instructor-card[data-delay="0"] { animation-delay: 0s; }
.instructor-card[data-delay="100"] { animation-delay: 0.1s; }
.instructor-card[data-delay="200"] { animation-delay: 0.2s; }

.instructor-card:hover {
  transform: translateY(-16px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.instructor-image {
  position: relative;
  height: 320px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
}

.instructor-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.instructor-card:hover .instructor-image img {
  transform: scale(1.08);
}

.instructor-overlay {
  position: absolute;
  inset: 0;
  background: rgba(24, 102, 212, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.instructor-card:hover .instructor-overlay {
  opacity: 1;
}

.instructor-info {
  padding: 24px;
  text-align: center;
}

.instructor-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.instructor-title {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin: 0;
}

/* ============ ABOUT SECTION ============ */
.about-section {
  padding: 120px 0;
  background: var(--bg-primary);
}

.about-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-content {
  animation: slideInLeft 0.8s ease-out;
}

.about-content .section-title {
  margin-bottom: 24px;
}

.about-text {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.about-image {
  animation: slideInRight 0.8s ease-out;
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.about-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* ============ BLOG SECTION ============ */
.blog-section {
  padding: 120px 0;
  background: var(--bg-secondary);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 32px;
}

.blog-card {
  background: var(--bg-primary);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
  box-shadow: var(--shadow-md);
}

.blog-card[data-delay="0"] { animation-delay: 0s; }
.blog-card[data-delay="100"] { animation-delay: 0.1s; }
.blog-card[data-delay="200"] { animation-delay: 0.2s; }

.blog-card:hover {
  transform: translateY(-16px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.blog-image {
  position: relative;
  height: 220px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
}

.blog-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.blog-card:hover .blog-image img {
  transform: scale(1.08);
}

.blog-category {
  position: absolute;
  top: 16px;
  left: 16px;
  background: var(--accent);
  border-radius: 20px;
  z-index: 1;
}

.blog-category a {
  display: block;
  color: white;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
}

.blog-content {
  padding: 24px;
}

.blog-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.blog-title a {
  color: var(--text-dark);
  transition: var(--transition);
}

.blog-title a:hover {
  color: var(--primary);
}

.blog-meta {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-light);
}

.blog-author {
  display: flex;
  align-items: center;
  gap: 6px;
}

.blog-read-more {
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.blog-read-more:hover {
  gap: 10px;
  color: var(--secondary);
}

/* ============ NEWSLETTER SECTION ============ */
.newsletter-section {
  position: relative;
  padding: 100px 0;
  background: linear-gradient(135deg, 
    rgba(15, 52, 96, 0.95) 0%,
    rgba(24, 102, 212, 0.9) 50%,
    rgba(88, 12, 227, 0.9) 100%);
  overflow: hidden;
  margin: 100px 0;
  border-radius: 24px;
}

.newsletter-overlay {
  position: absolute;
  inset: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.05)" fill-opacity="1" d="M0,64L80,80C160,96,320,128,480,144C640,160,800,160,960,144C1120,128,1280,96,1360,80L1440,64L1440,320L1360,320C1280,320,1120,320,960,320C800,320,640,320,480,320C320,320,160,320,80,320L0,320Z"></path></svg>');
  background-position: bottom;
  background-repeat: no-repeat;
  background-size: cover;
}

.newsletter-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
  color: white;
}

.newsletter-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.newsletter-subtitle {
  font-size: 1.1rem;
  margin-bottom: 32px;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.7;
}

.newsletter-form {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.newsletter-input-group {
  display: flex;
  gap: 12px;
  width: 100%;
  max-width: 500px;
  flex-wrap: wrap;
}

.newsletter-input-group input {
  flex: 1;
  min-width: 200px;
  padding: 14px 20px;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
}

.newsletter-input-group .btn {
  white-space: nowrap;
}

/* ============ BACK TO TOP ============ */
.back-to-top {
  position: fixed;
  bottom: 40px;
  right: 40px;
  z-index: 50;
  display: none;
}

.back-to-top a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  border-radius: 50%;
  font-size: 1.2rem;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
}

.back-to-top a:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* ============ ANIMATIONS ============ */
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(25px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-25px); }
}

@keyframes bounce {
  0%, 100% {
    opacity: 0.5;
    transform: translateY(0);
  }
  50% {
    opacity: 1;
    transform: translateY(8px);
  }
}

/* ============ RESPONSIVE DESIGN ============ */
@media (max-width: 1024px) {
  .hero-wrapper {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-image {
    display: none;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .search-input-group {
    grid-template-columns: 1fr;
  }

  .about-wrapper {
    grid-template-columns: 1fr;
  }

  .cta-title {
    font-size: 2.2rem;
  }

  h1 { font-size: 2.5rem; }
  h2 { font-size: 1.875rem; }
}

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  
  .hero-section {
    min-height: 80vh;
    padding: 80px 0;
  }

  .hero-title {
    font-size: 1.875rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .section-title {
    font-size: 1.875rem;
  }

  .search-card {
    padding: 24px;
  }

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

  .courses-grid,
  .blog-grid {
    grid-template-columns: 1fr;
  }

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

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .cta-section {
    margin: 50px 0;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.5rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .hero-buttons {
    gap: 8px;
  }

  .btn {
    padding: 10px 20px;
    font-size: 14px;
  }

  .categories-grid {
    grid-template-columns: 1fr;
  }

  .instructors-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .newsletter-title {
    font-size: 1.5rem;
  }

  .stat-value {
    font-size: 2.5rem;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
  }

  .back-to-top a {
    width: 45px;
    height: 45px;
    font-size: 1rem;
  }
}