/* ============================================
   GateMate - Premium EdTech Website
   Modern, Dynamic, Fully Responsive
   ============================================ */

:root {
  /* Primary Palette - Deep Indigo + Electric Cyan */
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --primary-light: #818cf8;
  --accent: #06b6d4;
  --accent-dark: #0891b2;
  
  /* Neutrals */
  --bg: #0f0f17;
  --bg-soft: #16161f;
  --bg-card: #1c1c28;
  --bg-elevated: #242433;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
  --gradient-accent: linear-gradient(135deg, #06b6d4 0%, #8b5cf6 100%);
  --gradient-warm: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
  --gradient-success: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(79, 70, 229, 0.25);
  
  /* Spacing & Radius */
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --container: 1200px;
  --header-h: 80px;
  
  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 0.3s var(--ease);
}

/* Light Theme */
[data-theme="light"] {
  --bg: #f8fafc;
  --bg-soft: #f1f5f9;
  --bg-card: #ffffff;
  --bg-elevated: #ffffff;
  --text: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  --border: rgba(15, 23, 42, 0.08);
  --border-hover: rgba(15, 23, 42, 0.15);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 40px rgba(79, 70, 229, 0.12);
}

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

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', 'Inter', sans-serif;
  font-weight: 700;
  line-height: 1.25;
}

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

ul { list-style: none; }

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

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

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========== Preloader ========== */
#preloader {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s, visibility 0.5s;
}

#preloader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader {
  text-align: center;
}

.loader-ring {
  width: 50px;
  height: 50px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

.loader span {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-sm { padding: 8px 18px; font-size: 0.875rem; }
.btn-lg { padding: 16px 32px; font-size: 1rem; }
.btn-block { width: 100%; }

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(79, 70, 229, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(79, 70, 229, 0.45);
}

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

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  background: rgba(79, 70, 229, 0.08);
}

.btn-light {
  background: #fff;
  color: var(--primary-dark);
}

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

.btn-outline-light {
  border: 2px solid rgba(255,255,255,0.4);
  color: #fff;
}

.btn-outline-light:hover {
  background: rgba(255,255,255,0.1);
  border-color: #fff;
}

/* ========== Header / Navbar ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-h);
  z-index: 1000;
  transition: var(--transition);
  background: transparent;
}

.header.scrolled {
  background: rgba(15, 15, 23, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 4px 30px rgba(0,0,0,0.2);
  border-bottom: 1px solid var(--border);
}

[data-theme="light"] .header.scrolled {
  background: rgba(248, 250, 252, 0.9);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.5rem;
  z-index: 10;
}

.logo-icon {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border-radius: 12px;
  color: #fff;
  font-size: 1.1rem;
}

.logo-text span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-muted);
  border-radius: 8px;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

.nav-cta { margin-left: 8px; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  transition: var(--transition);
}

.theme-toggle:hover {
  color: var(--primary-light);
  border-color: var(--primary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 40px) 0 80px;
  overflow: hidden;
}

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

.hero-shape {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}

.shape-1 {
  width: 500px;
  height: 500px;
  background: var(--primary);
  top: -10%;
  right: -5%;
  animation: float 12s ease-in-out infinite;
}

.shape-2 {
  width: 400px;
  height: 400px;
  background: var(--accent);
  bottom: 10%;
  left: -10%;
  animation: float 15s ease-in-out infinite reverse;
}

.shape-3 {
  width: 250px;
  height: 250px;
  background: #8b5cf6;
  top: 40%;
  left: 40%;
  opacity: 0.25;
  animation: float 10s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, -30px); }
}

.hero-content {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(79, 70, 229, 0.15);
  border: 1px solid rgba(79, 70, 229, 0.3);
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--primary-light);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 540px;
  margin-bottom: 32px;
}

.hero-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
}

.hero-stats .stat {
  display: flex;
  flex-direction: column;
}

.hero-stats strong {
  font-family: 'Outfit', sans-serif;
  font-size: 1.75rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-stats span {
  font-size: 0.875rem;
  color: var(--text-dim);
}

/* Hero Visual */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 100%;
  max-width: 340px;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  position: relative;
  z-index: 2;
}

.hero-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  color: #ef4444;
  margin-bottom: 20px;
}

.live-dot {
  width: 8px;
  height: 8px;
  background: #ef4444;
  border-radius: 50%;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-card-body {
  text-align: center;
}

.hero-card-body > i {
  font-size: 2.5rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 12px;
}

.hero-card-body h3 {
  font-size: 1.15rem;
  margin-bottom: 4px;
}

.hero-card-body p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.progress-bar {
  height: 6px;
  background: var(--bg-elevated);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 12px;
}

.progress {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 3px;
  transition: width 1s var(--ease);
}

.viewers {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.floating-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  box-shadow: var(--shadow-md);
  z-index: 3;
  animation: floatCard 6s ease-in-out infinite;
}

.floating-card i {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  font-size: 1rem;
  color: #fff;
}

.floating-card strong {
  display: block;
  font-size: 0.9rem;
}

.floating-card span {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.card-1 {
  top: 10%;
  left: -20px;
  animation-delay: 0s;
}

.card-1 i { background: var(--gradient-warm); }

.card-2 {
  bottom: 15%;
  right: -10px;
  animation-delay: 2s;
}

.card-2 i { background: var(--gradient-accent); }

@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-indicator a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--border);
  border-radius: 50%;
  color: var(--text-muted);
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* Animations */
.animate-fade-up {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 0.8s var(--ease) forwards;
}

.delay-1 { animation-delay: 0.15s; }
.delay-2 { animation-delay: 0.3s; }
.delay-3 { animation-delay: 0.45s; }
.delay-4 { animation-delay: 0.6s; }

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

/* ========== Sections ========== */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(79, 70, 229, 0.12);
  color: var(--primary-light);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 50px;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: 16px;
}

.section-header p {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* ========== Courses ========== */
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 10px 22px;
  border-radius: 50px;
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.course-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.course-card.hidden {
  display: none;
}

.course-img {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  font-size: 3rem;
  color: rgba(255,255,255,0.9);
}

.exam-bg { background: linear-gradient(135deg, #4f46e5, #7c3aed); }
.tech-bg { background: linear-gradient(135deg, #06b6d4, #3b82f6); }
.ai-bg { background: linear-gradient(135deg, #8b5cf6, #ec4899); }
.gate-bg { background: linear-gradient(135deg, #0ea5e9, #6366f1); }
.mern-bg { background: linear-gradient(135deg, #10b981, #06b6d4); }
.free-bg { background: linear-gradient(135deg, #f59e0b, #ef4444); }

.course-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.course-badge.paid { background: rgba(0,0,0,0.4); color: #fff; }
.course-badge.hot { background: #ef4444; color: #fff; }
.course-badge.free { background: #10b981; color: #fff; }

.course-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.course-meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.course-meta i { margin-right: 4px; }

.course-body h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.course-body > p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  flex: 1;
}

.course-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.price .current {
  font-family: 'Outfit', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-light);
}

.price .old {
  font-size: 0.85rem;
  color: var(--text-dim);
  text-decoration: line-through;
  margin-left: 6px;
}

.price .free-price {
  color: #10b981;
}

/* ========== Features ========== */
.features {
  background: var(--bg-soft);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  font-size: 1.35rem;
  color: #fff;
  margin-bottom: 20px;
}

.icon-1 { background: linear-gradient(135deg, #4f46e5, #818cf8); }
.icon-2 { background: linear-gradient(135deg, #06b6d4, #22d3ee); }
.icon-3 { background: linear-gradient(135deg, #8b5cf6, #a78bfa); }
.icon-4 { background: linear-gradient(135deg, #f59e0b, #fbbf24); }
.icon-5 { background: linear-gradient(135deg, #10b981, #34d399); }
.icon-6 { background: linear-gradient(135deg, #ef4444, #f87171); }

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* ========== Teachers ========== */
.teachers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}

.teacher-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
}

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

.teacher-avatar {
  width: 90px;
  height: 90px;
  margin: 0 auto 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  color: #fff;
  position: relative;
}

.teacher-avatar::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid transparent;
  background: var(--gradient-primary) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

.avatar-1 { background: linear-gradient(135deg, #4f46e5, #818cf8); }
.avatar-2 { background: linear-gradient(135deg, #06b6d4, #22d3ee); }
.avatar-3 { background: linear-gradient(135deg, #8b5cf6, #c084fc); }
.avatar-4 { background: linear-gradient(135deg, #ec4899, #f472b6); }
.avatar-5 { background: linear-gradient(135deg, #10b981, #34d399); }
.avatar-6 { background: linear-gradient(135deg, #f59e0b, #fbbf24); }

.teacher-card h3 {
  font-size: 1.15rem;
  margin-bottom: 4px;
}

.teacher-card .subject {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary-light);
  background: rgba(79, 70, 229, 0.12);
  padding: 4px 12px;
  border-radius: 50px;
  margin-bottom: 12px;
}

.teacher-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.teacher-social {
  display: flex;
  justify-content: center;
  gap: 10px;
}

.teacher-social a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.teacher-social a:hover {
  background: var(--primary);
  color: #fff;
}

/* ========== CTA Banner ========== */
.cta-banner {
  padding: 80px 0;
  background: var(--gradient-primary);
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  background: rgba(255,255,255,0.08);
  border-radius: 50%;
  top: -100px;
  right: -50px;
}

.cta-content {
  text-align: center;
  position: relative;
  z-index: 1;
}

.cta-content h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  color: #fff;
  margin-bottom: 12px;
}

.cta-content p {
  color: rgba(255,255,255,0.85);
  font-size: 1.1rem;
  max-width: 520px;
  margin: 0 auto 32px;
}

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

/* ========== Testimonials ========== */
.testimonials-slider {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: var(--transition);
}

.testimonial-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}

.stars {
  color: #f59e0b;
  font-size: 0.9rem;
  margin-bottom: 16px;
  display: flex;
  gap: 3px;
}

.testimonial-card > p {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.7;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 1.1rem;
}

.testimonial-author strong {
  display: block;
  font-size: 0.95rem;
}

.testimonial-author span {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ========== Contact ========== */
.contact {
  background: var(--bg-soft);
}

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

.contact-info .section-tag { margin-bottom: 12px; }

.contact-info h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 16px;
}

.contact-info > p {
  color: var(--text-muted);
  margin-bottom: 36px;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 36px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.contact-item i {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(79, 70, 229, 0.12);
  color: var(--primary-light);
  border-radius: 12px;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact-item strong {
  display: block;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 2px;
}

.contact-item a:hover {
  color: var(--primary-light);
}

.social-links {
  display: flex;
  gap: 12px;
}

.social-links a {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.social-links a:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  transform: translateY(-3px);
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: 18px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.95rem;
  transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  cursor: pointer;
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

/* ========== Footer ========== */
.footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 70px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 16px;
  max-width: 280px;
}

.footer-links h4 {
  font-size: 1rem;
  margin-bottom: 20px;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--primary-light);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.footer-bottom .quote {
  font-style: italic;
  color: var(--text-muted);
}

/* ========== Back to Top ========== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  color: #fff;
  border-radius: 14px;
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 100;
  box-shadow: 0 4px 20px rgba(79, 70, 229, 0.4);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
}

/* ========== Responsive ========== */
@media (max-width: 992px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero p { margin-left: auto; margin-right: auto; }
  
  .hero-btns { justify-content: center; }
  
  .hero-stats { justify-content: center; }
  
  .hero-visual {
    max-width: 380px;
    margin: 0 auto;
  }
  
  .floating-card.card-1 { left: -10px; }
  .floating-card.card-2 { right: -10px; }
  
  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root { --header-h: 70px; }
  
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-card);
    flex-direction: column;
    align-items: flex-start;
    padding: 100px 30px 40px;
    gap: 4px;
    transition: right 0.4s var(--ease);
    box-shadow: var(--shadow-lg);
    border-left: 1px solid var(--border);
    z-index: 999;
  }
  
  .nav-menu.open { right: 0; }
  
  .nav-link {
    width: 100%;
    padding: 12px 16px;
  }
  
  .nav-link.active::after { display: none; }
  
  .nav-cta { margin-left: 0; width: 100%; margin-top: 12px; }
  .nav-cta .btn { width: 100%; }
  
  .nav-toggle { display: flex; }
  
  .nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
  
  .section { padding: 70px 0; }
  
  .courses-grid,
  .features-grid,
  .teachers-grid,
  .testimonials-slider {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .hero-card { max-width: 100%; }
  
  .floating-card {
    display: none;
  }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  
  .hero-btns { flex-direction: column; }
  .hero-btns .btn { width: 100%; }
  
  .cta-btns { flex-direction: column; }
  .cta-btns .btn { width: 100%; }
  
  .contact-form { padding: 24px 20px; }
  
  .filter-tabs { gap: 8px; }
  .filter-btn { padding: 8px 16px; font-size: 0.8rem; }
}