/* =====================================================
   ClassNotes.Site - Custom Styles
   Bootstrap 5 + Font Awesome + AOS Enhancements
   Author: Sarosh Quader Baig
   ===================================================== */

/* =====================================================
   CSS Variables & Theme Colors
   ===================================================== */
:root {
  /* Primary Colors */
  --cn-primary: #6366f1;
  --cn-primary-rgb: 99, 102, 241;
  --cn-primary-dark: #4f46e5;
  --cn-primary-light: #818cf8;
  
  /* Accent Colors */
  --cn-accent: #10b981;
  --cn-accent-rgb: 16, 185, 129;
  
  /* Gradients */
  --cn-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
  --cn-gradient-alt: linear-gradient(135deg, #06b6d4 0%, #10b981 100%);
  
  /* Spacing */
  --cn-section-padding: 6rem;
  
  /* Transitions */
  --cn-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --cn-transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Glass Effect */
  --cn-glass-bg: rgba(255, 255, 255, 0.05);
  --cn-glass-border: rgba(255, 255, 255, 0.1);
  --cn-glass-blur: blur(20px);
  
  /* Shadows */
  --cn-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --cn-shadow-md: 0 4px 20px rgba(0, 0, 0, 0.15);
  --cn-shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.2);
  --cn-shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
}

/* Light Theme Variables */
[data-bs-theme="light"] {
  --cn-glass-bg: rgba(255, 255, 255, 0.7);
  --cn-glass-border: rgba(0, 0, 0, 0.1);
}

/* =====================================================
   Base Styles
   ===================================================== */
html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  overflow-x: hidden;
  transition: var(--cn-transition);
}

::selection {
  background: var(--cn-primary);
  color: white;
}

/* =====================================================
   Button Enhancements
   ===================================================== */
.btn {
  transition: var(--cn-transition);
}

.btn-primary {
  background: var(--cn-gradient);
  border: none;
}

.btn-primary:hover,
.btn-primary:focus {
  box-shadow: 0 10px 25px rgba(var(--cn-primary-rgb), 0.4);
  transform: translateY(-2px);
}

.btn-outline-primary:hover {
  transform: translateY(-2px);
}

/* =====================================================
   Typography
   ===================================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

.lead {
  font-weight: 400;
  line-height: 1.7;
}

code, pre, .font-mono {
  font-family: 'JetBrains Mono', monospace;
}

/* =====================================================
   Preloader
   ===================================================== */
#preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bs-body-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

#preloader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

#preloader .spinner-border {
  width: 3rem;
  height: 3rem;
  color: var(--cn-primary);
}

#preloader::after {
  content: 'Loading...';
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--bs-secondary);
  letter-spacing: 0.1em;
}

/* =====================================================
   Progress Bar
   ===================================================== */
.progress-bar-top {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--cn-gradient);
  z-index: 9999;
  transition: width 0.1s ease;
}

/* =====================================================
   Navigation
   ===================================================== */
.navbar-blur {
  background: rgba(var(--bs-body-bg-rgb), 0.85) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--cn-glass-border);
  padding: 1rem 0;
  transition: var(--cn-transition);
}

.navbar-blur.scrolled {
  padding: 0.5rem 0;
  box-shadow: var(--cn-shadow-md);
  background: rgba(var(--bs-body-bg-rgb), 0.95) !important;
}

.navbar-brand {
  font-size: 1.35rem;
  transition: var(--cn-transition);
}

.navbar-brand:hover {
  transform: scale(1.02);
}

.nav-link {
  font-weight: 500;
  padding: 0.5rem 1rem !important;
  margin: 0 0.25rem;
  border-radius: 0.5rem;
  position: relative;
  transition: var(--cn-transition);
  font-size: 0.95rem;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--cn-primary);
  transition: var(--cn-transition);
  transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 60%;
}

.nav-link:hover {
  background: rgba(var(--cn-primary-rgb), 0.1);
  color: var(--cn-primary) !important;
}

.theme-toggle {
  width: 42px;
  height: 42px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--cn-transition);
  font-size: 1.1rem;
  overflow: hidden;
}

.theme-toggle i {
  transition: transform 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.theme-toggle:hover {
  background: rgba(var(--cn-primary-rgb), 0.1);
  color: var(--cn-primary);
}

.theme-toggle:hover i {
  transform: rotate(360deg);
}

.navbar-toggler {
  font-size: 1.25rem;
  padding: 0.5rem 0.75rem;
  transition: var(--cn-transition);
}

.navbar-toggler:focus {
  box-shadow: none;
}

/* =====================================================
   Hero Section
   ===================================================== */
.hero-section {
  padding-top: 120px;
  padding-bottom: 80px;
  background: var(--bs-body-bg);
  min-height: 100vh;
}

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

.shape {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.6;
  animation: float 25s ease-in-out infinite;
}

.shape-1 {
  width: 700px;
  height: 700px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.5), rgba(139, 92, 246, 0.3));
  top: -250px;
  right: -150px;
  animation-delay: 0s;
}

.shape-2 {
  width: 600px;
  height: 600px;
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.4), rgba(16, 185, 129, 0.3));
  bottom: -150px;
  left: -200px;
  animation-delay: -8s;
}

.shape-3 {
  width: 450px;
  height: 450px;
  background: linear-gradient(135deg, rgba(236, 72, 153, 0.35), rgba(168, 85, 247, 0.25));
  top: 40%;
  left: 40%;
  transform: translate(-50%, -50%);
  animation-delay: -15s;
}

@keyframes float {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  25% {
    transform: translate(40px, -40px) scale(1.08);
  }
  50% {
    transform: translate(-30px, 30px) scale(0.92);
  }
  75% {
    transform: translate(-40px, -30px) scale(1.04);
  }
}

@keyframes pulse-glow {
  0%, 100% {
    opacity: 0.3;
  }
  50% {
    opacity: 0.6;
  }
}

.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.stat-card {
  padding: 2rem 1.5rem;
  text-align: center;
  border-radius: 1.25rem;
  transition: var(--cn-transition);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--cn-gradient);
  transform: scaleX(0);
  transition: var(--cn-transition);
}

.stat-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--cn-shadow-glow);
}

.stat-card:hover::before {
  transform: scaleX(1);
}

/* =====================================================
   Glass Card Effect
   ===================================================== */
.glass-card {
  background: var(--cn-glass-bg);
  backdrop-filter: var(--cn-glass-blur);
  -webkit-backdrop-filter: var(--cn-glass-blur);
  border: 1px solid var(--cn-glass-border);
  border-radius: 1.25rem;
  transition: var(--cn-transition);
}

.glass-card:hover {
  border-color: rgba(var(--cn-primary-rgb), 0.3);
  box-shadow: var(--cn-shadow-md);
}

/* =====================================================
   Section Spacing
   ===================================================== */
.py-6 {
  padding-top: var(--cn-section-padding);
  padding-bottom: var(--cn-section-padding);
}

/* =====================================================
   Course Cards
   ===================================================== */
.course-card {
  background: var(--cn-glass-bg);
  backdrop-filter: var(--cn-glass-blur);
  -webkit-backdrop-filter: var(--cn-glass-blur);
  border: 1px solid var(--cn-glass-border) !important;
  border-radius: 1.25rem !important;
  transition: var(--cn-transition);
  overflow: hidden;
  position: relative;
}

.course-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--cn-gradient);
  transform: scaleX(0);
  transition: var(--cn-transition);
}

.course-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px rgba(var(--cn-primary-rgb), 0.15);
  border-color: rgba(var(--cn-primary-rgb), 0.3) !important;
}

.course-card:hover::before {
  transform: scaleX(1);
}

.course-card .card-header,
.course-card .card-footer {
  background: transparent !important;
}

.course-icon {
  width: 65px;
  height: 65px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--cn-transition);
}

.course-card:hover .course-icon {
  transform: scale(1.15) rotate(5deg);
}

.course-card .badge {
  font-weight: 600;
  font-size: 0.7rem;
  padding: 0.5em 0.9em;
  letter-spacing: 0.02em;
}

.course-card .card-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.course-card .card-text {
  font-size: 0.9rem;
  line-height: 1.6;
}

.course-card .btn {
  transition: var(--cn-transition);
  font-weight: 600;
}

.course-card:hover .btn {
  transform: translateX(5px);
}

/* Search and Filter */
.input-group-text {
  background: var(--cn-glass-bg) !important;
  border: 1px solid var(--cn-glass-border) !important;
}

#courseSearch,
#courseFilter {
  background: var(--cn-glass-bg) !important;
  border: 1px solid var(--cn-glass-border) !important;
  transition: var(--cn-transition);
}

#courseSearch:focus,
#courseFilter:focus {
  border-color: var(--cn-primary) !important;
  box-shadow: 0 0 0 4px rgba(var(--cn-primary-rgb), 0.1) !important;
}

/* View Toggle Buttons */
#gridView.active,
#listView.active {
  background: var(--cn-primary) !important;
  border-color: var(--cn-primary) !important;
  color: white !important;
}

/* List View */
.courses-list .course-item {
  flex: 0 0 100%;
  max-width: 100%;
}

.courses-list .course-card {
  flex-direction: row;
  transition: var(--cn-transition);
}

.courses-list .course-card:hover {
  transform: translateX(8px);
}

.courses-list .course-card .card-header {
  padding: 1.5rem !important;
  width: auto;
  flex-shrink: 0;
  border-right: 1px solid var(--cn-glass-border);
}

.courses-list .course-card .card-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.5rem !important;
}

.courses-list .course-card .card-footer {
  display: flex;
  align-items: center;
  padding: 1.5rem !important;
  border-left: 1px solid var(--cn-glass-border);
}

.courses-list .course-card .btn {
  width: auto;
  white-space: nowrap;
}

/* =====================================================
   Feature Cards
   ===================================================== */
.feature-card {
  background: var(--cn-glass-bg);
  backdrop-filter: var(--cn-glass-blur);
  -webkit-backdrop-filter: var(--cn-glass-blur);
  border: 1px solid var(--cn-glass-border) !important;
  border-radius: 1.25rem !important;
  transition: var(--cn-transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--cn-gradient);
  opacity: 0;
  transition: var(--cn-transition);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--cn-shadow-lg);
}

.feature-card:hover::before {
  opacity: 0.03;
}

.feature-card > * {
  position: relative;
  z-index: 1;
}

.feature-icon-wrapper {
  width: 85px;
  height: 85px;
  background: var(--cn-gradient);
  border-radius: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  transition: var(--cn-transition);
  box-shadow: 0 10px 30px rgba(var(--cn-primary-rgb), 0.3);
}

.feature-card:hover .feature-icon-wrapper {
  transform: scale(1.1) rotate(5deg);
  box-shadow: 0 15px 40px rgba(var(--cn-primary-rgb), 0.4);
}

.feature-card h5 {
  font-size: 1.15rem;
}

/* =====================================================
   Stats Section
   ===================================================== */
.stats-section {
  background: linear-gradient(135deg, 
    rgba(var(--cn-primary-rgb), 0.08) 0%, 
    rgba(var(--cn-accent-rgb), 0.05) 100%
  );
  position: relative;
}

.stats-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%236366f1' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.stats-section .display-4 {
  font-size: 3rem;
  background: var(--cn-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.counter {
  transition: var(--cn-transition);
}

/* =====================================================
   About Section
   ===================================================== */
.about-image-wrapper {
  position: relative;
  padding: 2.5rem;
}

.about-shape {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--cn-gradient);
  border-radius: 2rem;
  opacity: 0.1;
  transform: rotate(-5deg);
}

.about-card {
  position: relative;
  z-index: 1;
}

.about-avatar {
  width: 90px;
  height: 90px;
  background: var(--cn-gradient);
  border-radius: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 10px 30px rgba(var(--cn-primary-rgb), 0.3);
  transition: var(--cn-transition);
}

.about-card:hover .about-avatar {
  transform: scale(1.1) rotate(-5deg);
  box-shadow: 0 15px 40px rgba(var(--cn-primary-rgb), 0.4);
}

/* =====================================================
   CTA Section
   ===================================================== */
.cta-section {
  background: var(--cn-gradient);
  position: relative;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='%23ffffff' fill-opacity='0.1' fill-rule='evenodd'/%3E%3C/svg%3E");
}

.cta-section h2 {
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

/* =====================================================
   Contact Section
   ===================================================== */
.contact-card {
  transition: var(--cn-transition);
}

.contact-card:hover {
  transform: translateX(10px);
  box-shadow: var(--cn-shadow-md);
}

.contact-icon {
  width: 55px;
  height: 55px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-form-wrapper {
  transition: var(--cn-transition);
}

.contact-form-wrapper:hover {
  box-shadow: var(--cn-shadow-lg);
}

.form-control,
.form-select,
.form-floating > .form-control {
  background: var(--cn-glass-bg) !important;
  border: 1px solid var(--cn-glass-border) !important;
  border-radius: 0.75rem;
  transition: var(--cn-transition);
}

.form-control:focus,
.form-select:focus,
.form-floating > .form-control:focus {
  background: var(--cn-glass-bg) !important;
  border-color: var(--cn-primary) !important;
  box-shadow: 0 0 0 4px rgba(var(--cn-primary-rgb), 0.1) !important;
}

.form-floating > label {
  color: var(--bs-secondary-color);
}

.social-links .btn {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--cn-transition);
}

.social-links .btn:hover {
  transform: translateY(-5px);
  box-shadow: var(--cn-shadow-md);
}

.social-links .btn-outline-secondary:hover {
  background: var(--bs-secondary);
  color: white;
}

.social-links .btn-outline-primary:hover {
  background: #0A66C2;
  border-color: #0A66C2;
  color: white;
}

.social-links .btn-outline-info:hover {
  background: #000;
  border-color: #000;
  color: white;
}

.social-links .btn-outline-danger:hover {
  background: #EA4335;
  border-color: #EA4335;
  color: white;
}

/* =====================================================
   Footer
   ===================================================== */
.footer {
  background: var(--bs-body-bg);
  border-top: 1px solid var(--cn-glass-border);
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  transition: var(--cn-transition);
  display: inline-flex;
  align-items: center;
}

.footer-links a:hover {
  color: var(--cn-primary) !important;
  transform: translateX(5px);
}

.footer-links a i {
  transition: var(--cn-transition);
}

.footer-links a:hover i {
  color: var(--cn-primary);
}

/* Hover Primary Utility */
.hover-primary {
  transition: var(--cn-transition);
}

.hover-primary:hover {
  color: var(--cn-primary) !important;
}

.newsletter-form .form-control {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

.newsletter-form .btn {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}

.footer-social .btn {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: var(--cn-transition);
}

.footer-social .btn:hover {
  transform: translateY(-3px);
  background: var(--cn-primary);
  border-color: var(--cn-primary);
  color: white;
}

/* =====================================================
   Scroll to Top Button
   ===================================================== */
.scroll-top-btn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--cn-transition);
  z-index: 999;
  box-shadow: var(--cn-shadow-lg);
  font-size: 1rem;
  background: var(--cn-gradient);
  border: none;
}

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

.scroll-top-btn:hover {
  transform: translateY(-5px);
  box-shadow: var(--cn-shadow-glow);
}

/* =====================================================
   Buttons Enhancement
   ===================================================== */
.btn {
  font-weight: 600;
  transition: var(--cn-transition);
  position: relative;
  overflow: hidden;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: var(--cn-gradient);
  border: none;
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--cn-gradient);
  transform: translateY(-2px);
  box-shadow: var(--cn-shadow-glow);
}

.btn-outline-secondary:hover {
  transform: translateY(-2px);
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1rem;
}

/* Button ripple effect */
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
  transform: scale(0);
  opacity: 0;
  transition: transform 0.5s, opacity 0.3s;
}

.btn:active::after {
  transform: scale(2);
  opacity: 1;
  transition: transform 0s, opacity 0s;
}

/* =====================================================
   Badge Enhancements
   ===================================================== */
.badge {
  font-weight: 600;
  letter-spacing: 0.03em;
  transition: var(--cn-transition);
}

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

/* =====================================================
   Form Enhancements
   ===================================================== */
.form-select {
  background-color: var(--cn-glass-bg) !important;
  border: 1px solid var(--cn-glass-border) !important;
}

.form-select:focus {
  border-color: var(--cn-primary) !important;
  box-shadow: 0 0 0 4px rgba(var(--cn-primary-rgb), 0.1) !important;
}

/* =====================================================
   Utility Classes
   ===================================================== */
.z-1 {
  z-index: 1;
}

.bg-dark-subtle {
  background: rgba(var(--cn-primary-rgb), 0.03) !important;
}

kbd {
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  border: 1px solid var(--cn-glass-border);
}

/* =====================================================
   Animations
   ===================================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% center;
  }
  100% {
    background-position: 200% center;
  }
}

/* =====================================================
   Responsive Styles
   ===================================================== */
@media (max-width: 991.98px) {
  .hero-section {
    text-align: center;
  }
  
  .hero-section .d-flex {
    justify-content: center;
  }
  
  .hero-stats-grid {
    max-width: 400px;
    margin: 2rem auto 0;
  }
  
  .navbar-collapse {
    background: var(--cn-glass-bg);
    backdrop-filter: var(--cn-glass-blur);
    -webkit-backdrop-filter: var(--cn-glass-blur);
    border-radius: 1rem;
    padding: 1rem;
    margin-top: 1rem;
    border: 1px solid var(--cn-glass-border);
  }
  
  .nav-link:hover {
    background: transparent;
  }
  
  .py-6 {
    padding-top: 4rem;
    padding-bottom: 4rem;
  }
}

@media (max-width: 767.98px) {
  .display-4 {
    font-size: 2.25rem;
  }
  
  .display-5 {
    font-size: 1.85rem;
  }
  
  .hero-stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  
  .stat-card {
    padding: 1.25rem 1rem;
  }
  
  .py-6 {
    padding-top: 3rem;
    padding-bottom: 3rem;
  }
  
  .scroll-top-btn {
    bottom: 20px;
    right: 20px;
    width: 46px;
    height: 46px;
  }
  
  /* List view on mobile */
  .courses-list .course-card {
    flex-direction: column;
  }
  
  .courses-list .course-card .card-footer {
    padding-top: 0 !important;
  }
  
  .courses-list .course-card .btn {
    width: 100%;
  }
  
  .stats-section .display-4 {
    font-size: 2.25rem;
  }
}

@media (max-width: 575.98px) {
  .display-4 {
    font-size: 1.85rem;
  }
  
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  
  .btn-lg {
    padding: 0.7rem 1.25rem;
    font-size: 0.95rem;
  }
  
  .hero-section {
    padding-top: 100px;
    padding-bottom: 60px;
  }
  
  .course-card .card-body {
    padding: 1rem;
  }
  
  .feature-card {
    padding: 1.5rem !important;
  }
  
  .social-links .btn {
    width: 44px;
    height: 44px;
  }
  
  .contact-card {
    padding: 1rem !important;
  }
  
  .footer-social {
    justify-content: center;
  }
}

/* =====================================================
   Dark Theme Specific Adjustments
   ===================================================== */
[data-bs-theme="dark"] .course-card,
[data-bs-theme="dark"] .feature-card,
[data-bs-theme="dark"] .glass-card {
  background: rgba(30, 41, 59, 0.6);
  border-color: rgba(255, 255, 255, 0.08) !important;
}

[data-bs-theme="dark"] .bg-dark-subtle {
  background: rgba(15, 23, 42, 0.5) !important;
}

[data-bs-theme="dark"] .input-group-text,
[data-bs-theme="dark"] #courseSearch,
[data-bs-theme="dark"] #courseFilter,
[data-bs-theme="dark"] .form-control,
[data-bs-theme="dark"] .form-select {
  background: rgba(30, 41, 59, 0.6) !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
}

/* =====================================================
   Light Theme Specific Adjustments
   ===================================================== */
[data-bs-theme="light"] .course-card,
[data-bs-theme="light"] .feature-card,
[data-bs-theme="light"] .glass-card {
  background: rgba(255, 255, 255, 0.85);
  border-color: rgba(0, 0, 0, 0.08) !important;
}

[data-bs-theme="light"] .shape {
  opacity: 0.35;
}

[data-bs-theme="light"] .navbar-blur {
  background: rgba(255, 255, 255, 0.92) !important;
}

[data-bs-theme="light"] .bg-dark-subtle {
  background: rgba(99, 102, 241, 0.04) !important;
}

[data-bs-theme="light"] .footer {
  background: #f8fafc;
}

[data-bs-theme="light"] .input-group-text,
[data-bs-theme="light"] #courseSearch,
[data-bs-theme="light"] #courseFilter,
[data-bs-theme="light"] .form-control,
[data-bs-theme="light"] .form-select {
  background: rgba(255, 255, 255, 0.9) !important;
  border-color: rgba(0, 0, 0, 0.1) !important;
}

/* =====================================================
   Accessibility
   ===================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
  
  .shape {
    animation: none;
  }
}

/* Focus Styles for Accessibility */
:focus-visible {
  outline: 2px solid var(--cn-primary);
  outline-offset: 3px;
}

.btn:focus-visible,
.form-control:focus-visible,
.form-select:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px rgba(var(--cn-primary-rgb), 0.3) !important;
}

.nav-link:focus-visible {
  background: rgba(var(--cn-primary-rgb), 0.1);
  border-radius: 0.5rem;
}

/* Skip to content link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--cn-primary);
  color: white;
  padding: 8px 16px;
  z-index: 10000;
  transition: top 0.3s;
}

.skip-link:focus {
  top: 0;
}

/* =====================================================
   Print Styles
   ===================================================== */
@media print {
  .navbar-blur,
  .scroll-top-btn,
  #preloader,
  .progress-bar-top,
  .hero-bg-shapes,
  .cta-section {
    display: none !important;
  }
  
  .hero-section {
    padding-top: 0;
    min-height: auto;
  }
  
  .glass-card,
  .course-card,
  .feature-card {
    background: white !important;
    border: 1px solid #ddd !important;
    box-shadow: none !important;
  }
  
  .gradient-text {
    -webkit-text-fill-color: var(--cn-primary);
    color: var(--cn-primary);
  }
}