/*
 * LazyLibrarian Modern Theme v2.0
 * Built on Bootstrap 5 with custom enhancements
 */

:root {
  /* Primary Colors - Modern Purple Gradient Theme */
  --ll-primary: #667eea;
  --ll-primary-dark: #5a6fd8;
  --ll-primary-light: #7c8ff0;
  --ll-secondary: #764ba2;
  --ll-secondary-dark: #6a4190;
  
  /* Neutral Colors */
  --ll-dark: #1a1d23;
  --ll-gray-dark: #2d3748;
  --ll-gray: #4a5568;
  --ll-gray-light: #718096;
  --ll-gray-lighter: #e2e8f0;
  --ll-light: #f7fafc;
  --ll-white: #ffffff;
  
  /* Status Colors */
  --ll-success: #48bb78;
  --ll-warning: #ed8936;
  --ll-danger: #f56565;
  --ll-info: #4299e1;
  
  /* Shadows */
  --ll-shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --ll-shadow: 0 4px 6px rgba(0,0,0,0.1);
  --ll-shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
  --ll-shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
  
  /* Gradients */
  --ll-gradient-primary: linear-gradient(135deg, var(--ll-primary) 0%, var(--ll-secondary) 100%);
  --ll-gradient-dark: linear-gradient(135deg, var(--ll-dark) 0%, var(--ll-gray-dark) 100%);
  --ll-gradient-card: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(255,255,255,0.7) 100%);
  
  /* Border Radius */
  --ll-radius-sm: 0.375rem;
  --ll-radius: 0.5rem;
  --ll-radius-lg: 0.75rem;
  --ll-radius-xl: 1rem;
  
  /* Transitions */
  --ll-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  :root {
    --ll-light: #1a1d23;
    --ll-white: #2d3748;
    --ll-gray-lighter: #4a5568;
  }
}

/* Global Styles */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--ll-gradient-dark);
  color: var(--ll-gray);
  line-height: 1.6;
  min-height: 100vh;
}

/* Modern Navigation */
.navbar-lazylibrarian {
  background: rgba(26, 29, 35, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  box-shadow: var(--ll-shadow);
  padding: 1rem 0;
  transition: var(--ll-transition);
}

.navbar-lazylibrarian .navbar-brand {
  color: var(--ll-white);
  font-weight: 700;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.navbar-lazylibrarian .navbar-brand img {
  height: 32px;
  width: auto;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

.navbar-lazylibrarian .nav-link {
  color: rgba(255,255,255,0.8);
  padding: 0.5rem 1rem;
  border-radius: var(--ll-radius);
  transition: var(--ll-transition);
  font-weight: 500;
  margin: 0 0.25rem;
}

.navbar-lazylibrarian .nav-link:hover,
.navbar-lazylibrarian .nav-link.active {
  color: var(--ll-white);
  background: rgba(102, 126, 234, 0.2);
  transform: translateY(-1px);
}

/* Sidebar Navigation */
.sidebar-lazylibrarian {
  background: rgba(26, 29, 35, 0.95);
  backdrop-filter: blur(10px);
  border-right: 1px solid rgba(255,255,255,0.1);
  min-height: calc(100vh - 76px);
  padding: 1.5rem 0;
}

.sidebar-lazylibrarian .nav-link {
  color: rgba(255,255,255,0.7);
  padding: 0.75rem 1.5rem;
  border-radius: 0;
  transition: var(--ll-transition);
  border-left: 3px solid transparent;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.sidebar-lazylibrarian .nav-link:hover,
.sidebar-lazylibrarian .nav-link.active {
  color: var(--ll-white);
  background: rgba(102, 126, 234, 0.1);
  border-left-color: var(--ll-primary);
}

.sidebar-lazylibrarian .nav-link i {
  width: 20px;
  text-align: center;
}

/* Modern Cards */
.card-lazylibrarian {
  background: var(--ll-gradient-card);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--ll-radius-lg);
  box-shadow: var(--ll-shadow);
  backdrop-filter: blur(10px);
  transition: var(--ll-transition);
  overflow: hidden;
}

.card-lazylibrarian:hover {
  transform: translateY(-4px);
  box-shadow: var(--ll-shadow-lg);
}

.card-lazylibrarian .card-header {
  background: rgba(255,255,255,0.5);
  border-bottom: 1px solid rgba(255,255,255,0.2);
  font-weight: 600;
  color: var(--ll-gray-dark);
}

/* Book Cards */
.book-card {
  background: var(--ll-white);
  border-radius: var(--ll-radius-lg);
  overflow: hidden;
  box-shadow: var(--ll-shadow);
  transition: var(--ll-transition);
  cursor: pointer;
  position: relative;
}

.book-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--ll-shadow-xl);
}

.book-card .book-cover {
  width: 100%;
  height: 280px;
  object-fit: cover;
  background: var(--ll-gray-lighter);
}

.book-card .book-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to bottom, transparent 0%, rgba(0,0,0,0.7) 100%);
  opacity: 0;
  transition: var(--ll-transition);
  display: flex;
  align-items: flex-end;
  padding: 1rem;
}

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

.book-card .book-title {
  color: var(--ll-white);
  font-weight: 600;
  font-size: 0.9rem;
  margin: 0;
  line-height: 1.4;
}

.book-card .book-author {
  color: rgba(255,255,255,0.8);
  font-size: 0.8rem;
  margin: 0.25rem 0 0 0;
}

/* Modern Buttons */
.btn-lazylibrarian {
  background: var(--ll-gradient-primary);
  color: var(--ll-white);
  border: none;
  border-radius: var(--ll-radius);
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  transition: var(--ll-transition);
  box-shadow: var(--ll-shadow-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.875rem;
}

.btn-lazylibrarian:hover {
  transform: translateY(-2px);
  box-shadow: var(--ll-shadow);
  background: var(--ll-gradient-primary);
  color: var(--ll-white);
}

.btn-lazylibrarian:active {
  transform: translateY(0);
}

.btn-outline-lazylibrarian {
  background: transparent;
  color: var(--ll-primary);
  border: 2px solid var(--ll-primary);
  backdrop-filter: blur(10px);
}

.btn-outline-lazylibrarian:hover {
  background: var(--ll-primary);
  color: var(--ll-white);
  transform: translateY(-1px);
}

/* Stats Cards */
.stat-card {
  background: var(--ll-white);
  border-radius: var(--ll-radius-lg);
  padding: 1.5rem;
  box-shadow: var(--ll-shadow);
  transition: var(--ll-transition);
  border-left: 4px solid var(--ll-primary);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--ll-shadow-lg);
}

.stat-card .stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--ll-primary);
  margin-bottom: 0.5rem;
}

.stat-card .stat-label {
  color: var(--ll-gray);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.stat-card .stat-change {
  font-size: 0.75rem;
  margin-top: 0.5rem;
}

.stat-change.positive {
  color: var(--ll-success);
}

.stat-change.negative {
  color: var(--ll-danger);
}

/* Modern Tables */
.table-lazylibrarian {
  background: var(--ll-white);
  border-radius: var(--ll-radius-lg);
  overflow: hidden;
  box-shadow: var(--ll-shadow);
}

.table-lazylibrarian thead {
  background: var(--ll-gradient-primary);
  color: var(--ll-white);
}

.table-lazylibrarian th {
  border: none;
  padding: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.5px;
}

.table-lazylibrarian td {
  padding: 1rem;
  border-top: 1px solid var(--ll-gray-lighter);
  vertical-align: middle;
}

.table-lazylibrarian tbody tr:hover {
  background: rgba(102, 126, 234, 0.05);
}

/* Search and Filters */
.search-container {
  background: var(--ll-white);
  border-radius: var(--ll-radius-lg);
  padding: 1.5rem;
  box-shadow: var(--ll-shadow);
  margin-bottom: 2rem;
}

.search-lazylibrarian {
  border: 2px solid var(--ll-gray-lighter);
  border-radius: var(--ll-radius-lg);
  padding: 0.75rem 1rem 0.75rem 3rem;
  font-size: 1rem;
  transition: var(--ll-transition);
  background: var(--ll-white);
}

.search-lazylibrarian:focus {
  border-color: var(--ll-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
  outline: none;
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ll-gray);
  z-index: 10;
}

/* Loading States */
.loading-skeleton {
  background: linear-gradient(90deg, var(--ll-gray-lighter) 25%, var(--ll-light) 50%, var(--ll-gray-lighter) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  border-radius: var(--ll-radius);
}

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

/* Responsive Design */
@media (max-width: 768px) {
  .sidebar-lazylibrarian {
    position: fixed;
    top: 0;
    left: -250px;
    width: 250px;
    height: 100vh;
    z-index: 1050;
    transition: var(--ll-transition);
  }
  
  .sidebar-lazylibrarian.show {
    left: 0;
  }
  
  .book-card .book-cover {
    height: 200px;
  }
  
  .stat-card .stat-value {
    font-size: 1.5rem;
  }
}

/* Utility Classes */
.text-gradient {
  background: var(--ll-gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glass-effect {
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
}

.hover-lift {
  transition: var(--ll-transition);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--ll-shadow-lg);
}

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

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

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

.pulse-on-hover:hover {
  animation: pulse 0.6s ease-in-out;
}