/* ========================================
   MODERN ELEGANT FONTS - GOOGLE FONTS IMPORTS
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@700;800;900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Sora:wght@400;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&display=swap');

/* ========================================
   CSS VARIABLES & ROOT
   ======================================== */

:root {
  /* Modern Color Scheme - Eliot Brand - Dark Theme */
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #ec4899;
  --secondary-light: #f472b6;
  --light-gray: #1e293b;
  --gray: #334155;
  --dark-gray: #94a3b8;
  --text-dark: #f1f5f9;
  --text-light: #cbd5e1;
  --white: #0f172a;
  --bg-dark: #0f172a;
  --bg-darker: #0a0e27;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --success: #10b981;
  --danger: #ef4444;
  --accent-purple: #7c3aed;
  --accent-cyan: #06b6d4;
  --accent-teal: #14b8a6;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Typography */
  --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;

  /* Border Radius - Elegant Rounded Corners */
  --radius-sm: 0.5rem;
  --radius-md: 0.875rem;
  --radius-lg: 1.25rem;
  --radius-xl: 1.5rem;

  /* Shadow */
  --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 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition: all 0.3s ease;
}

/* ========================================
   GLOBAL STYLES
   ======================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--text-dark);
  background-color: var(--bg-dark);
  line-height: 1.6;
}

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

a:hover {
  color: var(--secondary-light);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ========================================
   ADVANCED EFFECTS - GLASSMORPHISM & ANIMATIONS
   ======================================== */

/* Neumorphism Variables */
:root {
  --neomorph-light-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  --neomorph-inset-shadow: inset 0 5px 15px rgba(0, 0, 0, 0.4);
  --neomorph-raised: 0 8px 20px rgba(0, 0, 0, 0.4);
}

/* Glassmorphism Utilities */
.glass-effect {
  background: rgba(30, 41, 59, 0.4);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(99, 102, 241, 0.2);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
}

/* Neumorphism Utilities */
.neomorph-raised {
  background: linear-gradient(145deg, #25364e, #1d2d3f);
  box-shadow: var(--neomorph-raised), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.neomorph-raised:hover {
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  transform: translateY(-2px);
}

.neomorph-raised:active {
  box-shadow: var(--neomorph-inset-shadow), inset 0 2px 5px rgba(0, 0, 0, 0.3);
  transform: translateY(0);
}

.neomorph-button {
  background: linear-gradient(145deg, #25364e, #1d2d3f);
  box-shadow: var(--neomorph-raised), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  border: none;
  border-radius: var(--radius-xl);
  padding: var(--spacing-md) var(--spacing-lg);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-weight: 600;
  color: var(--text-dark);
  position: relative;
  overflow: hidden;
}

.neomorph-button:hover {
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  transform: translateY(-2px);
}

.neomorph-button:active {
  box-shadow: var(--neomorph-inset-shadow);
  transform: translateY(0);
}

.glass-effect-dark {
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.glass-effect-deep {
  background: rgba(37, 99, 235, 0.1);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(37, 99, 235, 0.2);
  box-shadow: 0 8px 32px 0 rgba(37, 99, 235, 0.15);
}

/* Parallax Section Backgrounds */
.parallax-section {
  position: relative;
  overflow: hidden;
}

.parallax-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-attachment: fixed;
  background-size: cover;
  background-position: center;
  z-index: 1;
}

.parallax-content {
  position: relative;
  z-index: 2;
}

/* ========================================
   TOUCH-FRIENDLY & ACCESSIBILITY
   ======================================== */

/* Touch feedback for interactive elements */
@media (hover: none) and (pointer: coarse) {
  /* Disable hover effects on touch devices */
  .feature-card:hover,
  .course-card:hover,
  .btn-primary:hover,
  .payment-method-card:hover {
    transform: none;
  }

  /* Add active states instead */
  .feature-card:active {
    background: rgba(30, 41, 59, 0.85);
    box-shadow: 0 5px 15px rgba(236, 72, 153, 0.2);
  }

  .course-card:active {
    background: rgba(30, 41, 59, 0.85);
    box-shadow: 0 5px 15px rgba(236, 72, 153, 0.2);
  }

  .btn-primary:active {
    transform: scale(0.98);
  }

  /* Increase tap target size on touch devices */
  button,
  a,
  input[type="button"],
  input[type="submit"],
  input[type="checkbox"],
  input[type="radio"] {
    min-height: 44px;
    min-width: 44px;
  }

  /* Better touch spacing */
  .form-group input,
  .form-group textarea,
  .form-group select {
    padding: 1rem var(--spacing-md);
    font-size: 16px; /* Prevents iOS zoom */
  }

  /* Improve link tap areas */
  a {
    padding: 0.5rem;
    display: inline-block;
  }

  .navbar-menu a {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  /* Touch-friendly payment method cards */
  .payment-method-card {
    padding: var(--spacing-lg);
  }

  /* Remove tap highlight delay */
  * {
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  }
}

/* Keyboard focus indicators for accessibility */
*:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 2px;
}

/* Smooth scroll behavior */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

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

/* High contrast mode support */
@media (prefers-contrast: more) {
  .feature-card,
  .course-card,
  .btn-primary {
    border-width: 2px;
  }

  button,
  a {
    text-decoration: underline;
  }
}

/* Dark mode preference detection */
@media (prefers-color-scheme: dark) {
  /* Dark theme is already applied */
}

/* Light mode fallback if needed */
@media (prefers-color-scheme: light) {
  /* Can add light theme here if needed */
}

/* Smooth Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@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 slideInUp {
  from {
    opacity: 0;
    transform: translateY(50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 5px rgba(37, 99, 235, 0.5);
  }
  50% {
    box-shadow: 0 0 20px rgba(37, 99, 235, 0.8);
  }
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

/* Gradient Animations */
@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* Animation Classes */
.animate-fade-in {
  animation: fadeIn 0.6s ease-out;
}

.animate-slide-in-left {
  animation: slideInLeft 0.6s ease-out;
}

.animate-slide-in-right {
  animation: slideInRight 0.6s ease-out;
}

.animate-slide-in-up {
  animation: slideInUp 0.6s ease-out;
}

.animate-scale-in {
  animation: scaleIn 0.6s ease-out;
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

.animate-glow {
  animation: glow 2s ease-in-out infinite;
}

/* Hover Effects */
.hover-lift {
  transition: var(--transition);
}

.hover-lift:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.hover-scale {
  transition: var(--transition);
}

.hover-scale:hover {
  transform: scale(1.05);
}

.hover-rotate {
  transition: var(--transition);
}

.hover-rotate:hover {
  transform: rotate(5deg) scale(1.02);
}

/* Advanced Micro-Interaction Animations */

/* Bounce animation */
@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  25% {
    transform: translateY(-10px);
  }
  50% {
    transform: translateY(0);
  }
  75% {
    transform: translateY(-5px);
  }
}

/* Wiggle animation */
@keyframes wiggle {
  0%, 100% {
    transform: rotate(0deg);
  }
  25% {
    transform: rotate(-1deg);
  }
  75% {
    transform: rotate(1deg);
  }
}

/* Heartbeat animation */
@keyframes heartbeat {
  0%, 100% {
    transform: scale(1);
  }
  10%, 30% {
    transform: scale(0.9);
  }
  20%, 40%, 60%, 80% {
    transform: scale(1.1);
  }
  50%, 70% {
    transform: scale(1.05);
  }
}

/* Flip animation */
@keyframes flip {
  from {
    transform: perspective(400px) rotateY(0);
  }
  to {
    transform: perspective(400px) rotateY(360deg);
  }
}

/* Swing animation */
@keyframes swing {
  20% {
    transform: rotate(15deg);
  }
  40% {
    transform: rotate(-10deg);
  }
  60% {
    transform: rotate(5deg);
  }
  80% {
    transform: rotate(-5deg);
  }
  100% {
    transform: rotate(0deg);
  }
}

/* Blink animation */
@keyframes blink {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.3;
  }
}

/* Color shift animation */
@keyframes colorShift {
  0% {
    color: var(--secondary);
  }
  50% {
    color: var(--secondary-light);
  }
  100% {
    color: var(--secondary);
  }
}

/* Slide down animation */
@keyframes slideDown {
  from {
    opacity: 0;
    max-height: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    max-height: 500px;
    transform: translateY(0);
  }
}

/* Slide up animation */
@keyframes slideUp {
  from {
    opacity: 1;
    max-height: 500px;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    max-height: 0;
    transform: translateY(-20px);
  }
}

/* Fade scale animation */
@keyframes fadeScale {
  0% {
    opacity: 0;
    transform: scale(0.95);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

/* Utility animation classes */
.animate-bounce {
  animation: bounce 0.6s ease-in-out;
}

.animate-wiggle {
  animation: wiggle 0.6s ease-in-out;
}

.animate-heartbeat {
  animation: heartbeat 1.3s ease-in-out infinite;
}

.animate-flip {
  animation: flip 0.6s ease-in-out;
}

.animate-swing {
  animation: swing 0.6s ease-in-out;
}

.animate-blink {
  animation: blink 1s ease-in-out infinite;
}

.animate-color-shift {
  animation: colorShift 2s ease-in-out infinite;
}

/* Smooth transitions for UI changes */
.smooth-transition {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.smooth-transition-fast {
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

.smooth-transition-slow {
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   INTERACTIVE ELEMENT FEEDBACK
   ======================================== */

/* Link interaction states */
a {
  position: relative;
}

a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--secondary);
  transition: width 0.3s ease;
}

a:hover::after {
  width: 100%;
}

/* Button ripple effect */
button.ripple {
  position: relative;
  overflow: hidden;
}

button.ripple::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 5px;
  height: 5px;
  background: rgba(255, 255, 255, 0.5);
  opacity: 0;
  border-radius: 50%;
  transform: scale(1);
  transform: translate(-50%, -50%);
  animation: ripple 0.6s ease-out;
}

@keyframes ripple {
  to {
    width: 200px;
    height: 200px;
    opacity: 0;
  }
}

/* Checkbox and radio smooth transitions */
input[type="checkbox"],
input[type="radio"] {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--gray);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  background-color: transparent;
}

input[type="checkbox"]:hover,
input[type="radio"]:hover {
  border-color: var(--secondary);
  box-shadow: 0 0 0 2px rgba(236, 72, 153, 0.1);
}

input[type="checkbox"]:checked,
input[type="radio"]:checked {
  background-color: var(--secondary);
  border-color: var(--secondary);
  box-shadow: 0 0 0 2px rgba(236, 72, 153, 0.2);
}

input[type="checkbox"]:focus-visible,
input[type="radio"]:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 2px;
}

/* Disabled state styling */
button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

input:disabled,
textarea:disabled,
select:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background-color: rgba(30, 41, 59, 0.5);
}

/* Loading state for buttons */
button.loading {
  position: relative;
  color: transparent;
}

button.loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.8s linear infinite;
}

/* Success state feedback */
.input-success {
  border-color: var(--success);
  background-color: rgba(16, 185, 129, 0.05);
}

.input-success:focus {
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1);
}

/* Error state feedback */
.input-error {
  border-color: var(--danger);
  background-color: rgba(239, 68, 68, 0.05);
}

.input-error:focus {
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
}

/* Tooltip styling */
.tooltip {
  position: relative;
  display: inline-block;
}

.tooltip::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  background-color: rgba(0, 0, 0, 0.9);
  color: white;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 1000;
}

.tooltip:hover::before {
  opacity: 1;
}

/* Badge styling with animation */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
  color: white;
  animation: fadeIn 0.4s ease-out;
}

.badge.pulse {
  animation: pulse 2s ease-in-out infinite;
}



.hover-glow {
  transition: var(--transition);
}

.hover-glow:hover {
  filter: drop-shadow(0 0 10px rgba(37, 99, 235, 0.6));
}

.hover-blur-out {
  transition: var(--transition);
}

.hover-blur-out:hover {
  filter: blur(0px);
}

/* Gradient Backgrounds */
.gradient-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.gradient-primary-animated {
  background: linear-gradient(-45deg, var(--primary), var(--secondary), var(--primary-dark), var(--secondary-light));
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
}

.gradient-sunset {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.gradient-ocean {
  background: linear-gradient(135deg, #667eea 0%, #2d87f0 100%);
}

.gradient-success {
  background: linear-gradient(135deg, var(--success) 0%, #07a05c 100%);
}

/* Backdrop Blur Effects */
.blur-sm {
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

.blur-md {
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.blur-lg {
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

/* Smooth Scroll Behavior */
.smooth-scroll {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

/* Extra Rounded Corner Classes */
.rounded-sm {
  border-radius: var(--radius-sm);
}

.rounded-md {
  border-radius: var(--radius-md);
}

.rounded-lg {
  border-radius: var(--radius-lg);
}

.rounded-xl {
  border-radius: var(--radius-xl);
}

.rounded-full {
  border-radius: 9999px;
}

/* Extra Rounded - Ultra */
.rounded-ultra {
  border-radius: 2rem;
}

.rounded-extreme {
  border-radius: 2.5rem;
}

/* ========================================
   NAVBAR
   ======================================== */

.navbar {
  background: rgba(30, 41, 59, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(99, 102, 241, 0.2);
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) var(--spacing-xl);
  max-width: 1200px;
  margin: 0 auto;
}

.navbar-logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.navbar-logo::before {
  content: '🎓';
  font-size: var(--font-size-2xl);
}

.navbar-menu {
  display: flex;
  gap: var(--spacing-xl);
  list-style: none;
  align-items: center;
}

.navbar-menu a {
  color: var(--text-dark);
  font-weight: 500;
  position: relative;
}

.navbar-menu a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: width 0.3s ease;
}

.navbar-menu a:hover::after {
  width: 100%;
}

.navbar-menu .btn-login {
  background-color: var(--primary);
  color: var(--white);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
}

.navbar-menu .btn-login:hover {
  background-color: var(--primary-dark);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--text-dark);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

#menu-toggle {
  display: none;
}

#menu-toggle:checked ~ .navbar-menu {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 70px;
  left: 0;
  right: 0;
  background-color: var(--white);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-lg);
  gap: var(--spacing-md);
}

#menu-toggle:checked ~ .hamburger span:nth-child(1) {
  transform: rotate(45deg) translate(10px, 10px);
}

#menu-toggle:checked ~ .hamburger span:nth-child(2) {
  opacity: 0;
}

#menu-toggle:checked ~ .hamburger span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
  position: relative;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  color: var(--text-dark);
  padding: var(--spacing-3xl) var(--spacing-xl);
  text-align: center;
  min-height: 500px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-xl);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
  animation: float 20s ease-in-out infinite;
  z-index: 1;
}

.hero h1 {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  position: relative;
  z-index: 2;
  animation: slideInUp 0.8s ease-out;
}

.hero p {
  font-size: var(--font-size-lg);
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
  position: relative;
  z-index: 2;
  animation: slideInUp 0.8s ease-out 0.2s backwards;
}

.btn-primary {
  background-color: var(--secondary);
  color: var(--text-dark);
  padding: var(--spacing-md) var(--spacing-2xl);
  border-radius: var(--radius-xl);
  font-weight: 600;
  font-size: var(--font-size-base);
  display: inline-block;
  position: relative;
  z-index: 2;
  animation: slideInUp 0.8s ease-out 0.4s backwards;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: none;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(236, 72, 153, 0.3);
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn-primary:hover {
  background-color: var(--secondary-light);
  transform: translateY(-3px);
  box-shadow: 0 15px 35px rgba(236, 72, 153, 0.4);
}

.btn-primary:active {
  transform: translateY(-1px);
  box-shadow: 0 5px 15px rgba(236, 72, 153, 0.3);
}

.btn-primary:active::before {
  width: 300px;
  height: 300px;
}

/* ========================================
   FEATURES GRID
   ======================================== */

.features {
  padding: var(--spacing-3xl) var(--spacing-xl);
  max-width: 1200px;
  margin: 0 auto;
}

.features-title {
  text-align: center;
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-3xl);
  color: var(--text-dark);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.feature-card {
  background: rgba(30, 41, 59, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(99, 102, 241, 0.2);
  animation: slideInUp 0.6s ease-out;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(135deg, transparent, rgba(236, 72, 153, 0.1), transparent);
  opacity: 0;
  transition: opacity 0.5s ease;
  transform: rotate(45deg);
}

.feature-card:hover {
  transform: translateY(-15px) scale(1.03);
  background: rgba(30, 41, 59, 0.9);
  box-shadow: 0 20px 50px rgba(236, 72, 153, 0.3);
  border: 1px solid rgba(236, 72, 153, 0.4);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card:active {
  transform: translateY(-8px) scale(1.01);
}

.feature-card-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  animation: float 3s ease-in-out infinite;
}

.feature-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
  color: var(--primary);
}

.feature-card p {
  color: var(--text-light);
  line-height: 1.8;
}

/* ========================================
   COURSES SECTION
   ======================================== */

.courses-section {
  padding: var(--spacing-3xl) var(--spacing-xl);
  background-color: var(--light-gray);
  margin-top: var(--spacing-3xl);
}

.courses-section-container {
  max-width: 1200px;
  margin: 0 auto;
}

.courses-title {
  text-align: center;
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-3xl);
  color: var(--text-dark);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.course-card {
  background: rgba(30, 41, 59, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(99, 102, 241, 0.2);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  animation: slideInUp 0.6s ease-out;
  position: relative;
}

.course-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(236, 72, 153, 0.1), transparent);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

.course-card:hover {
  transform: translateY(-18px) scale(1.03);
  background: rgba(30, 41, 59, 0.9);
  box-shadow: 0 20px 50px rgba(236, 72, 153, 0.3);
  border: 1px solid rgba(236, 72, 153, 0.4);
}

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

.course-card:active {
  transform: translateY(-10px) scale(1.01);
}

.course-card-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(-45deg, var(--primary), var(--secondary), var(--primary-dark), var(--secondary-light));
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--white);
}

.course-card-content {
  padding: var(--spacing-lg);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.course-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
  font-weight: 600;
}

.course-card-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--text-light);
}

.course-card-price {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--secondary);
  margin: var(--spacing-md) 0;
}

.course-card-description {
  color: var(--text-light);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-md);
  flex-grow: 1;
}

.btn-secondary {
  background-color: var(--primary);
  color: var(--white);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-lg);
  text-align: center;
  font-weight: 600;
  margin-top: auto;
  transition: var(--transition);
}

.btn-secondary:hover {
  background-color: var(--primary-dark);
  border-radius: var(--radius-xl);
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
  background-color: var(--bg-darker);
  color: var(--text-dark);
  padding: var(--spacing-3xl) var(--spacing-xl);
  margin-top: var(--spacing-3xl);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-column h4 {
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-lg);
}

.footer-column ul {
  list-style: none;
}

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

.footer-column a {
  color: var(--white);
  opacity: 0.8;
}

.footer-column a:hover {
  opacity: 1;
  color: var(--secondary);
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
}

.social-icon {
  width: 40px;
  height: 40px;
  background-color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: var(--font-size-lg);
  transition: var(--transition);
}

.social-icon:hover {
  background-color: var(--secondary);
  transform: translateY(-3px);
}

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

/* ========================================
   FORMS
   ======================================== */

.form-container {
  background-color: var(--light-gray);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
}

.form-box {
  background-color: var(--white);
  padding: var(--spacing-3xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 450px;
  width: 100%;
  animation: slideIn 0.5s ease;
}

.form-box h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-lg);
  color: var(--primary);
  text-align: center;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--text-dark);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--gray);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  background-color: rgba(30, 41, 59, 0.8);
  color: var(--text-dark);
}

.form-group input:hover,
.form-group textarea:hover,
.form-group select:hover {
  border-color: var(--secondary);
  background-color: rgba(30, 41, 59, 1);
  box-shadow: 0 0 0 1px rgba(236, 72, 153, 0.2);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 4px rgba(236, 72, 153, 0.2), inset 0 0 10px rgba(236, 72, 153, 0.1);
  background-color: rgba(30, 41, 59, 1);
  transform: scale(1.01);
}

.form-group-checkbox {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.form-group-checkbox input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
}

.form-group-checkbox label {
  margin: 0;
  font-weight: 400;
  cursor: pointer;
}

.form-links {
  text-align: center;
  margin-top: var(--spacing-lg);
  font-size: var(--font-size-sm);
}

.form-links a {
  color: var(--primary);
  margin: 0 var(--spacing-sm);
}

.btn-form {
  width: 100%;
  padding: var(--spacing-md);
  background-color: var(--primary);
  color: var(--white);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  transition: var(--transition);
}

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

/* ========================================
   SIDEBAR
   ======================================== */

.container-with-sidebar {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--spacing-xl);
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

.sidebar {
  background-color: var(--light-gray);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  height: fit-content;
  position: sticky;
  top: 100px;
}

.sidebar h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-lg);
  color: var(--primary);
}

.sidebar-menu {
  list-style: none;
}

.sidebar-menu li {
  margin-bottom: var(--spacing-md);
}

.sidebar-menu a {
  display: block;
  padding: var(--spacing-md);
  color: var(--text-dark);
  background-color: var(--white);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
  background-color: var(--primary);
  color: var(--white);
}

/* ========================================
   MAIN CONTENT
   ======================================== */

.main-content {
  background-color: var(--light-gray);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
}

.content-header {
  margin-bottom: var(--spacing-2xl);
}

.content-header h1 {
  font-size: var(--font-size-3xl);
  color: var(--text-dark);
  margin-bottom: var(--spacing-md);
}

.content-header p {
  color: var(--text-light);
  font-size: var(--font-size-lg);
}

/* ========================================
   TABS (CSS-Only)
   ======================================== */

.tabs {
  margin-top: var(--spacing-xl);
}

.tab-buttons {
  display: flex;
  gap: var(--spacing-sm);
  border-bottom: 2px solid var(--gray);
  margin-bottom: var(--spacing-lg);
}

.tab-button {
  padding: var(--spacing-md) var(--spacing-lg);
  background: none;
  border: none;
  color: var(--text-light);
  font-weight: 600;
  cursor: pointer;
  position: relative;
  transition: color 0.3s ease;
}

.tab-button:hover {
  color: var(--secondary);
}

input[type="radio"].tab-radio {
  display: none;
}

.tab-radio:checked + .tab-button {
  color: var(--secondary);
  border-bottom: 3px solid var(--secondary);
  margin-bottom: -2px;
}

.tab-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-radio:checked ~ .tab-content {
  display: block;
}

/* ========================================
   ACCORDION (CSS-Only)
   ======================================== */

.accordion-item {
  border: 1px solid var(--gray);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
}

.accordion-header {
  padding: var(--spacing-lg);
  background-color: var(--bg-card);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  transition: background-color 0.3s ease;
}

.accordion-header:hover {
  background-color: var(--bg-card-hover);
}

.accordion-toggle {
  display: none;
}

.accordion-toggle:checked + .accordion-header {
  background-color: var(--secondary);
  color: var(--text-dark);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.accordion-toggle:checked ~ .accordion-content {
  max-height: 500px;
}

.accordion-content-text {
  padding: var(--spacing-lg);
  background-color: var(--white);
}

/* ========================================
   TWO-COLUMN LAYOUT
   ======================================== */

.two-column {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-xl);
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

.column-left,
.column-right {
  background-color: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.column-right {
  height: fit-content;
  position: sticky;
  top: 100px;
}

/* ========================================
   STATS CARDS
   ======================================== */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.stat-card {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.stat-card h3 {
  font-size: var(--font-size-sm);
  opacity: 0.9;
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.stat-card-number {
  font-size: var(--font-size-3xl);
  font-weight: 700;
}

/* ========================================
   PROGRESS BAR
   ======================================== */

.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--gray);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-top: var(--spacing-md);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: var(--radius-lg);
  transition: width 0.3s ease;
}

/* ========================================
   TABLE
   ======================================== */

.table-container {
  overflow-x: auto;
  margin-top: var(--spacing-lg);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th {
  background-color: var(--light-gray);
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  color: var(--text-dark);
  border-bottom: 2px solid var(--gray);
}

td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--gray);
}

tr:hover {
  background-color: var(--light-gray);
}

/* ========================================
   VIDEO PLAYER PLACEHOLDER
   ======================================== */

.video-placeholder {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
}

.video-controls {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background-color: var(--light-gray);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
}

.video-control-btn {
  flex: 1;
  padding: var(--spacing-md);
  background-color: var(--white);
  border: 2px solid var(--gray);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.video-control-btn.active {
  background-color: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.video-control-btn:hover {
  border-color: var(--primary);
}

/* ========================================
   ENROLLMENT CARD
   ======================================== */

.enrollment-card {
  background: rgba(30, 41, 59, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(99, 102, 241, 0.2);
  box-shadow: 0 8px 32px 0 rgba(236, 72, 153, 0.1);
  transition: var(--transition);
  animation: slideInRight 0.6s ease-out;
}

.enrollment-card:hover {
  background: rgba(30, 41, 59, 0.8);
  box-shadow: 0 15px 40px rgba(236, 72, 153, 0.2);
  border: 1px solid rgba(236, 72, 153, 0.3);
}

.enrollment-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

.enrollment-price {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: var(--spacing-lg);
}

.enrollment-info {
  list-style: none;
  margin-bottom: var(--spacing-lg);
}

.enrollment-info li {
  padding: var(--spacing-sm) 0;
  color: var(--text-light);
  display: flex;
  gap: var(--spacing-sm);
}

.enrollment-info li::before {
  content: '✓';
  color: var(--success);
  font-weight: 700;
}

.btn-enroll {
  width: 100%;
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  border-radius: var(--radius-xl);
  font-weight: 600;
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
  animation: slideInUp 0.6s ease-out;
}

.btn-enroll:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(37, 99, 235, 0.5);
  filter: brightness(1.1);
}

/* ========================================
   REVIEWS
   ======================================== */

.reviews-section {
  margin-top: var(--spacing-2xl);
}

.reviews-section h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-lg);
  color: var(--text-dark);
}

.review-card {
  background: rgba(30, 41, 59, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  border-left: 4px solid var(--secondary);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: var(--transition);
  animation: slideInLeft 0.6s ease-out;
}

.review-card:hover {
  transform: translateX(10px);
  background: rgba(255, 255, 255, 0.75);
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.15);
}

.review-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.review-author {
  font-weight: 600;
  color: var(--text-dark);
}

.review-rating {
  color: var(--secondary);
  font-size: var(--font-size-sm);
}

.review-text {
  color: var(--text-light);
  line-height: 1.8;
}

/* ========================================
   ANIMATIONS
   ======================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

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

/* ========================================
   MOBILE-FIRST RESPONSIVE DESIGN
   ======================================== */

/* Extra Small Devices (< 480px) */
@media (max-width: 480px) {
  :root {
    --font-size-4xl: 1.5rem;
    --font-size-3xl: 1.25rem;
    --font-size-2xl: 1.125rem;
    --spacing-2xl: 1.5rem;
    --spacing-3xl: 2rem;
  }

  body {
    overflow-x: hidden;
  }

  /* Touch-friendly tap targets */
  button,
  a,
  input[type="button"],
  input[type="submit"] {
    min-height: 48px;
    min-width: 48px;
  }

  /* Navbar */
  .navbar-container {
    padding: var(--spacing-md) var(--spacing-md);
  }

  .navbar-logo {
    font-size: var(--font-size-base);
  }

  /* Hero */
  .hero {
    padding: var(--spacing-2xl) var(--spacing-md);
    min-height: 280px;
    gap: var(--spacing-lg);
  }

  .hero h1 {
    font-size: 1.75rem;
    line-height: 1.3;
  }

  .hero p {
    font-size: var(--font-size-sm);
    padding: 0 var(--spacing-sm);
  }

  .btn-primary {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-sm);
  }

  /* Cards */
  .feature-card,
  .course-card,
  .enrollment-card,
  .review-card {
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
  }

  .feature-card:hover {
    transform: translateY(-8px) scale(1.02);
  }

  .course-card:hover {
    transform: translateY(-10px) scale(1.02);
  }

  /* Grids */
  .features-grid,
  .courses-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  /* Sections */
  .features,
  .courses-section,
  .footer {
    padding: var(--spacing-2xl) var(--spacing-md);
  }

  /* Forms */
  .form-box {
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
  }

  .form-group {
    margin-bottom: var(--spacing-md);
  }

  .form-group input,
  .form-group textarea,
  .form-group select {
    padding: var(--spacing-md) var(--spacing-sm);
    font-size: 16px; /* Prevent zoom on iOS */
  }

  /* Payment Layout */
  .payment-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
  }

  .payment-summary-section {
    position: static;
    top: auto;
    margin-top: var(--spacing-lg);
    height: auto;
  }

  /* Tabs */
  .tab-buttons {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }

  .tab-button {
    padding: var(--spacing-md) var(--spacing-md);
    font-size: var(--font-size-sm);
    flex: 1;
    min-width: 100px;
  }

  /* Footer */
  .footer-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  /* Text sizing */
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.25rem; }
  h3 { font-size: 1.125rem; }
  h4 { font-size: 1rem; }

  /* Reduce animation on mobile */
  @media (prefers-reduced-motion: reduce) {
    * {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
    }
  }
}

/* Small Devices (480px - 768px) */
@media (max-width: 768px) and (min-width: 481px) {
  :root {
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.5rem;
    --spacing-2xl: 2rem;
  }

  /* Touch-friendly tap targets */
  button,
  a,
  input[type="button"],
  input[type="submit"] {
    min-height: 44px;
    min-width: 44px;
  }

  /* Navbar */
  .navbar-container {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  /* Hero */
  .hero {
    padding: var(--spacing-2xl) var(--spacing-lg);
    min-height: 350px;
  }

  /* Cards with better spacing */
  .feature-card,
  .course-card {
    margin-bottom: var(--spacing-lg);
  }

  /* Grids - 2 columns where possible */
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  /* Payment */
  .payment-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
}

/* ========================================
   MEDIA QUERIES (Mobile Responsiveness)
   ======================================== */

@media (max-width: 768px) {
  :root {
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.5rem;
  }

  /* Navbar */
  .navbar-container {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  .hamburger {
    display: flex;
  }

  .navbar-menu {
    display: none;
  }

  .navbar-logo {
    font-size: var(--font-size-lg);
  }

  /* Hero */
  .hero {
    padding: var(--spacing-2xl) var(--spacing-lg);
    min-height: 350px;
  }

  .hero h1 {
    font-size: var(--font-size-2xl);
  }

  /* Grids */
  .features-grid,
  .courses-grid {
    grid-template-columns: 1fr;
  }

  /* Forms */
  .form-box {
    padding: var(--spacing-xl);
  }

  /* Sidebar Layout */
  .container-with-sidebar {
    grid-template-columns: 1fr;
    padding: var(--spacing-lg);
  }

  .sidebar {
    position: static;
    top: auto;
  }

  /* Two Column */
  .two-column {
    grid-template-columns: 1fr;
    padding: var(--spacing-lg);
  }

  .column-right {
    position: static;
    top: auto;
  }

  /* Tabs */
  .tab-buttons {
    flex-wrap: wrap;
  }

  .tab-button {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
  }

  /* Stats */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Footer */
  .footer-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  /* Table */
  table {
    font-size: var(--font-size-sm);
  }

  th, td {
    padding: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-2xl: 1.25rem;
    --spacing-xl: 1rem;
    --spacing-lg: 1rem;
  }

  .hero h1 {
    font-size: var(--font-size-xl);
  }

  .features-title,
  .courses-title {
    font-size: var(--font-size-2xl);
  }

  .form-box {
    padding: var(--spacing-lg);
  }

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

  .tab-buttons {
    gap: var(--spacing-xs);
  }

  .tab-button {
    padding: var(--spacing-sm);
  }
}
/* ========================================
   PAYMENT PAGE STYLES
   ======================================== */

.payment-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-xl);
}

.payment-wrapper {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--spacing-2xl);
  background-color: var(--white);
}

.payment-form-section {
  background: transparent;
}

.payment-form {
  background: transparent;
}

/* Course Summary */
.payment-course-summary {
  background: rgba(30, 41, 59, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-2xl);
  border: 1px solid rgba(99, 102, 241, 0.2);
  animation: slideInUp 0.6s ease-out;
}

.payment-course-summary h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
  color: var(--text-dark);
}

.course-summary-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  color: var(--text-dark);
}

/* Payment Method Section */
.payment-method-section {
  margin-bottom: var(--spacing-2xl);
}

.payment-method-section h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
  color: var(--text-dark);
}

.payment-methods {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

.payment-method-option {
  cursor: pointer;
}

.payment-method-option input[type="radio"] {
  display: none;
}

.payment-method-card {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  border: 2px solid var(--gray);
  border-radius: var(--radius-lg);
  background: rgba(30, 41, 59, 0.6);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  transition: var(--transition);
  cursor: pointer;
  animation: slideInUp 0.6s ease-out;
}

.payment-method-card:hover {
  border-color: var(--secondary);
  background: rgba(236, 72, 153, 0.1);
  transform: translateY(-3px);
}

.payment-method-option input[type="radio"]:checked + .payment-method-card {
  border-color: var(--secondary);
  background: rgba(236, 72, 153, 0.15);
  box-shadow: 0 10px 30px rgba(236, 72, 153, 0.2);
}

.payment-method-icon {
  font-size: 2rem;
}

.payment-method-info {
  flex: 1;
}

.payment-method-info h4 {
  margin: 0;
  color: var(--text-dark);
  font-size: var(--font-size-base);
  font-weight: 600;
}

.payment-method-info p {
  margin: var(--spacing-xs) 0 0 0;
  color: var(--text-light);
  font-size: var(--font-size-sm);
}

/* Payment Form Fields */
.payment-form-fields {
  display: none;
  margin-bottom: var(--spacing-2xl);
}

.payment-form-fields.active {
  display: block;
}

.payment-form-fields h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
  color: var(--text-dark);
}

/* Form Controls */
.form-control {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  border: 1px solid var(--gray);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-family: inherit;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

/* Bank Transfer Details */
.bank-details {
  background: rgba(37, 99, 235, 0.08);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--primary);
  border: 1px solid rgba(37, 99, 235, 0.2);
  animation: slideInUp 0.6s ease-out 0.2s backwards;
}

.bank-detail-item {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--gray);
  font-size: var(--font-size-sm);
}

.bank-detail-item:last-child {
  border-bottom: none;
}

.detail-label {
  font-weight: 600;
  color: var(--text-dark);
}

.detail-value {
  color: var(--text-light);
  font-family: 'Courier New', monospace;
}

/* Billing Info */
.billing-info {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-2xl);
  border: 1px solid rgba(255, 255, 255, 0.2);
  animation: slideInUp 0.6s ease-out 0.1s backwards;
}

.billing-info h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
  color: var(--text-dark);
}

/* Checkboxes */
.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.checkbox-group input[type="checkbox"] {
  margin-top: var(--spacing-xs);
  cursor: pointer;
  width: 20px;
  height: 20px;
}

.checkbox-group label {
  margin: 0;
  color: var(--text-dark);
  font-size: var(--font-size-sm);
  cursor: pointer;
  font-weight: normal;
}

/* Payment Buttons */
.btn-payment-submit {
  width: 100%;
  padding: var(--spacing-lg) var(--spacing-2xl);
  background-color: var(--primary);
  color: var(--white);
  font-size: var(--font-size-lg);
  font-weight: 600;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: var(--spacing-lg);
}

.btn-payment-submit:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-google-pay,
.btn-apple-pay {
  width: 100%;
  padding: var(--spacing-lg) var(--spacing-2xl);
  background-color: var(--text-dark);
  color: var(--white);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-xl);
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-google-pay:hover,
.btn-apple-pay:hover {
  background-color: #1a1a1a;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Payment Security */
.payment-security {
  background-color: rgba(16, 185, 129, 0.1);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--success);
  text-align: center;
}

.payment-security p {
  margin: var(--spacing-sm) 0;
  color: var(--text-dark);
  font-size: var(--font-size-sm);
}

/* Right Column - Order Summary */
.payment-summary-section {
  background: rgba(30, 41, 59, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(99, 102, 241, 0.2);
  box-shadow: 0 8px 32px 0 rgba(236, 72, 153, 0.1);
  height: fit-content;
  position: sticky;
  top: 20px;
  animation: slideInRight 0.6s ease-out;
}

.order-summary h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
  color: var(--text-dark);
}

/* Order Course Card */
.order-course-card {
  display: flex;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: rgba(236, 72, 153, 0.05);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
  border: 1px solid rgba(236, 72, 153, 0.1);
}

.order-course-icon {
  font-size: 2rem;
}

.order-course-details {
  flex: 1;
}

.order-course-details h4 {
  margin: 0 0 var(--spacing-xs) 0;
  color: var(--text-dark);
}

.order-course-details p {
  margin: var(--spacing-xs) 0;
  font-size: var(--font-size-sm);
  color: var(--text-light);
}

/* Order Includes */
.order-includes {
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--gray);
  margin-bottom: var(--spacing-lg);
}

.order-includes h4 {
  margin: 0 0 var(--spacing-md) 0;
  color: var(--text-dark);
  font-size: var(--font-size-base);
}

.order-includes ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.order-includes li {
  padding: var(--spacing-sm) 0;
  color: var(--text-dark);
  font-size: var(--font-size-sm);
}

/* Price Breakdown */
.price-breakdown {
  padding: var(--spacing-lg) 0;
}

.price-row {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  color: var(--text-dark);
  font-size: var(--font-size-sm);
}

/* Guarantee Badge */
.guarantee-badge {
  background: rgba(16, 185, 129, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  text-align: center;
  margin-bottom: var(--spacing-lg);
  border: 2px solid var(--success);
  animation: slideInUp 0.6s ease-out 0.3s backwards;
  transition: var(--transition);
}

.guarantee-badge:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(16, 185, 129, 0.2);
}

.guarantee-badge h4 {
  margin: 0 0 var(--spacing-sm) 0;
  color: var(--success);
}

.guarantee-badge p {
  margin: 0;
  color: var(--text-light);
  font-size: var(--font-size-sm);
  line-height: 1.5;
}

/* Trust Badges */
.trust-badges {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
}

.trust-badge {
  background: rgba(37, 99, 235, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  text-align: center;
  color: var(--primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border: 1px solid rgba(37, 99, 235, 0.2);
  transition: var(--transition);
  animation: slideInUp 0.6s ease-out;
}

.trust-badge:hover {
  transform: translateY(-3px) scale(1.05);
  border: 1px solid rgba(37, 99, 235, 0.5);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.2);
}

/* FAQ Items */
.faq-item {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: var(--transition);
  animation: slideInUp 0.6s ease-out;
}

.faq-item:hover {
  transform: translateY(-5px);
  background: rgba(255, 255, 255, 0.75);
  box-shadow: 0 12px 40px rgba(37, 99, 235, 0.15);
  border: 1px solid rgba(37, 99, 235, 0.2);
}

.faq-item h4 {
  margin: 0 0 var(--spacing-md) 0;
  color: var(--text-dark);
  font-size: var(--font-size-base);
}

.faq-item p {
  margin: 0;
  color: var(--text-light);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

/* Responsive Payment Styles */
@media (max-width: 1024px) {
  .payment-wrapper {
    grid-template-columns: 1fr;
  }

  .payment-summary-section {
    position: static;
    top: auto;
    margin-top: var(--spacing-2xl);
  }

  .form-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .payment-container {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .payment-method-card {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-md);
  }

  .payment-method-info {
    flex: 1;
  }

  .payment-method-info h4 {
    font-size: var(--font-size-sm);
  }

  .bank-detail-item {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .trust-badges {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   MODERN PRELOADER
   ======================================== */

.preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(-45deg, #6366f1, #ec4899, #4f46e5, #f472b6);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.preloader.fade-out {
  opacity: 0;
  visibility: hidden;
}

.preloader-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-2xl);
}

.preloader-logo {
  font-size: 3.5rem;
  animation: float 3s ease-in-out infinite;
}

.spinner {
  width: 60px;
  height: 60px;
  position: relative;
}

/* Modern Spinner Animation */
.spinner::before,
.spinner::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  border: 3px solid transparent;
  border-radius: 50%;
  animation: spin 2s linear infinite;
}

.spinner::before {
  border-top-color: rgba(255, 255, 255, 0.9);
  border-right-color: rgba(255, 255, 255, 0.3);
  animation: spin 2s linear infinite;
}

.spinner::after {
  border-bottom-color: rgba(255, 255, 255, 0.6);
  border-left-color: rgba(255, 255, 255, 0.2);
  animation: spin 1.5s linear infinite reverse;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Pulsing dots animation */
.preloader-text {
  color: white;
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  min-height: 1.5rem;
}

.preloader-text::after {
  content: '';
  animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
  0%, 20% {
    content: '';
  }
  40% {
    content: '.';
  }
  60% {
    content: '..';
  }
  80%, 100% {
    content: '...';
  }
}

/* Alternative dot loader */
.dot-loader {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  align-items: flex-end;
}

.dot-loader span {
  width: 12px;
  height: 12px;
  background-color: white;
  border-radius: 50%;
  animation: bounce 1.4s infinite ease-in-out both;
}

.dot-loader span:nth-child(1) {
  animation-delay: -0.32s;
}

.dot-loader span:nth-child(2) {
  animation-delay: -0.16s;
}

@keyframes bounce {
  0%, 80%, 100% {
    transform: scale(0.8);
    opacity: 0.5;
  }
  40% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Pulse ring loader */
.pulse-ring {
  width: 80px;
  height: 80px;
  position: relative;
  margin: 0 auto;
}

.pulse-ring::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

.pulse-ring::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  border: 3px solid transparent;
  border-top-color: white;
  border-right-color: rgba(255, 255, 255, 0.6);
  border-radius: 50%;
  animation: spin 1.5s linear infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.2);
    opacity: 0.7;
  }
}

/* Gradient line loader */
.progress-line {
  width: 120px;
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
}

.progress-line::before {
  content: '';
  position: absolute;
  width: 40%;
  height: 100%;
  background: linear-gradient(90deg, transparent, white, transparent);
  animation: slide 1.5s infinite;
}

@keyframes slide {
  0% {
    left: -40%;
  }
  100% {
    left: 100%;
  }
}

/* Hide scrollbar during preload */
body.preloading {
  overflow: hidden;
}

/* Responsive preloader text */
@media (max-width: 768px) {
  .preloader-logo {
    font-size: 2.5rem;
  }
  
  .preloader-text {
    font-size: 1rem;
  }
}

/* ========================================
   LARGE SCREEN OPTIMIZATION (1024px+)
   ======================================== */

@media (min-width: 1024px) {
  /* Enhanced hover effects on desktop */
  .feature-card {
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .feature-card:hover {
    transform: translateY(-20px) scale(1.05);
  }

  .course-card {
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .course-card:hover {
    transform: translateY(-20px) scale(1.05);
  }

  /* Better spacing for desktop */
  .features {
    padding: var(--spacing-3xl) var(--spacing-2xl);
  }

  .courses-section {
    padding: var(--spacing-3xl) var(--spacing-2xl);
  }

  /* Wider grids */
  .features-grid,
  .courses-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Payment layout optimization */
  .payment-container {
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-2xl);
    max-width: 1400px;
    margin: 0 auto;
  }

  .payment-summary-section {
    height: fit-content;
    top: 100px;
  }

  /* Better form layout */
  .form-container {
    padding: var(--spacing-3xl);
  }

  .form-box {
    padding: var(--spacing-3xl);
    max-width: 550px;
  }
}

/* ========================================
   TABLET OPTIMIZATION (769px - 1023px)
   ======================================== */

@media (min-width: 769px) and (max-width: 1023px) {
  /* Two-column grids on tablet */
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  /* Balanced spacing */
  .features {
    padding: var(--spacing-2xl) var(--spacing-xl);
  }

  .courses-section {
    padding: var(--spacing-2xl) var(--spacing-xl);
  }

  /* Payment layout */
  .payment-container {
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl);
  }

  .payment-summary-section {
    position: sticky;
    top: 80px;
    height: fit-content;
  }

  /* Better card spacing */
  .feature-card,
  .course-card {
    margin-bottom: var(--spacing-lg);
  }
}

/* ========================================
   LANDSCAPE ORIENTATION OPTIMIZATION
   ======================================== */

@media (max-height: 600px) and (orientation: landscape) {
  .hero {
    min-height: auto;
    padding: var(--spacing-lg);
  }

  .hero h1 {
    margin-bottom: var(--spacing-sm);
  }

  .navbar-container {
    padding: var(--spacing-sm) var(--spacing-lg);
  }

  /* Reduce vertical spacing in landscape */
  button,
  a {
    min-height: 40px;
  }
}

/* ========================================
   HIGH DPI SCREENS (Retina Displays)
   ======================================== */

@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  /* Slightly thinner shadows for retina clarity */
  .feature-card,
  .course-card,
  .enrollment-card {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  }

  .btn-primary {
    box-shadow: 0 8px 16px rgba(236, 72, 153, 0.25);
  }

  /* Smoother edges */
  * {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
}