// CSS Custom Properties for theming
:root {
  --bs-body-bg: #ffffff;
  --bs-body-color: #212529;
  --bs-navbar-bg: #f8f9fa;
  --bs-navbar-color: rgba(0, 0, 0, 0.65);
  --bs-navbar-active-color: rgba(0, 0, 0, 0.9);
  --bs-navbar-brand-color: #0d6efd;
  --bs-hero-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --bs-hero-color: #ffffff;
  --bs-card-bg: #ffffff;
  --bs-card-border: rgba(0, 0, 0, 0.125);
  --bs-feature-bg: #f8f9fa;
  --bs-footer-bg: #e9ecef;
  --bs-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --bs-shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
}

// Dark theme variables
.dark-theme {
  --bs-body-bg: #0d1117;
  --bs-body-color: #f0f6fc;
  --bs-navbar-bg: #161b22;
  --bs-navbar-color: rgba(240, 246, 252, 0.65);
  --bs-navbar-active-color: rgba(240, 246, 252, 0.9);
  --bs-navbar-brand-color: #58a6ff;
  --bs-hero-bg: linear-gradient(135deg, #1f2937 0%, #374151 100%);
  --bs-hero-color: #f0f6fc;
  --bs-card-bg: #21262d;
  --bs-card-border: rgba(240, 246, 252, 0.125);
  --bs-feature-bg: #161b22;
  --bs-footer-bg: #0d1117;
  --bs-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.3);
  --bs-shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.5);
}

// Global styles
* {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body {
  background-color: var(--bs-body-bg);
  color: var(--bs-body-color);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
}

// Navbar styling
.navbar {
  background-color: var(--bs-navbar-bg) !important;
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--bs-card-border);
  box-shadow: var(--bs-shadow);
  
  .navbar-brand {
    color: var(--bs-navbar-brand-color) !important;
    font-weight: 700;
    font-size: 1.5rem;
    
    &:hover {
      transform: scale(1.05);
      transition: transform 0.2s ease;
    }
  }
  
  .navbar-nav .nav-link {
    color: var(--bs-navbar-color) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: 0.375rem;
    margin: 0 0.25rem;
    
    &:hover {
      background-color: rgba(var(--bs-primary-rgb), 0.1);
      color: var(--bs-navbar-active-color) !important;
    }
    
    &.active {
      background-color: rgba(var(--bs-primary-rgb), 0.15);
      color: var(--bs-navbar-active-color) !important;
    }
  }
}

// Hero section
.hero-section {
  background: var(--bs-hero-bg);
  color: var(--bs-hero-color);
  min-height: 60vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  
  &::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
  }
  
  .container {
    position: relative;
    z-index: 1;
  }
  
  h1 {
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    margin-bottom: 1.5rem;
  }
  
  .lead {
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    opacity: 0.95;
  }
  
  .btn {
    box-shadow: var(--bs-shadow-lg);
    border: none;
    font-weight: 600;
    
    &:hover {
      transform: translateY(-2px);
      box-shadow: 0 1.5rem 4rem rgba(0, 0, 0, 0.2);
    }
  }
}

// Card styling
.card {
  background-color: var(--bs-card-bg);
  border: 1px solid var(--bs-card-border);
  box-shadow: var(--bs-shadow);
  transition: all 0.3s ease;
  
  &:hover {
    transform: translateY(-5px);
    box-shadow: var(--bs-shadow-lg);
  }
  
  .feature-icon {
    transition: transform 0.3s ease;
  }
  
  &:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
  }
}

// Theme toggle styling
.form-check-input {
  &:checked {
    background-color: #0d6efd;
    border-color: #0d6efd;
  }
}

// Background sections
.bg-body-secondary {
  background-color: var(--bs-feature-bg) !important;
}

.bg-body-tertiary {
  background-color: var(--bs-footer-bg) !important;
}

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

.card {
  animation: fadeInUp 0.6s ease forwards;
  
  &:nth-child(1) { animation-delay: 0.1s; }
  &:nth-child(2) { animation-delay: 0.2s; }
  &:nth-child(3) { animation-delay: 0.3s; }
}

// Responsive improvements
@media (max-width: 768px) {
  .hero-section {
    min-height: 50vh;
    text-align: center;
    
    h1 {
      font-size: 2.5rem;
    }
    
    .lead {
      font-size: 1.1rem;
    }
  }
  
  .navbar-brand {
    font-size: 1.25rem !important;
  }
  
  .feature-icon {
    width: 3rem !important;
    height: 3rem !important;
  }
}

// Custom scrollbar for webkit browsers
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bs-body-bg);
}

::-webkit-scrollbar-thumb {
  background: rgba(var(--bs-primary-rgb), 0.3);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(var(--bs-primary-rgb), 0.5);
}

// Focus styles for accessibility
.btn:focus,
.form-check-input:focus,
.nav-link:focus {
  box-shadow: 0 0 0 0.25rem rgba(var(--bs-primary-rgb), 0.25);
}

// Print styles
@media print {
  .navbar,
  .form-check,
  footer {
    display: none !important;
  }
  
  .hero-section {
    background: none !important;
    color: black !important;
  }
}