/* Neumorphism CSS Styles */
:root {
  --neu-bg: #e0e5ec;
  --neu-shadow-light: #ffffff;
  --neu-shadow-dark: #a3b1c6;
  --neu-text-primary: #2d3748;
  --neu-text-secondary: #4a5568;
  --neu-accent: #667eea;
  --neu-accent-light: #764ba2;
}

/* Dark mode variables */
.dark {
  --neu-bg: #2d3748;
  --neu-shadow-light: #4a5568;
  --neu-shadow-dark: #1a202c;
  --neu-text-primary: #e2e8f0;
  --neu-text-secondary: #cbd5e0;
  --neu-accent: #667eea;
  --neu-accent-light: #764ba2;
}

* {
  transition: all 0.3s ease;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Neumorphism Shadow Classes */
.shadow-neu {
  box-shadow: 
    8px 8px 16px var(--neu-shadow-dark),
    -8px -8px 16px var(--neu-shadow-light);
}

.shadow-neu-inset {
  box-shadow: 
    inset 4px 4px 8px var(--neu-shadow-dark),
    inset -4px -4px 8px var(--neu-shadow-light);
}

.shadow-neu-large {
  box-shadow: 
    12px 12px 24px var(--neu-shadow-dark),
    -12px -12px 24px var(--neu-shadow-light);
}

.shadow-neu-pressed {
  box-shadow: 
    inset 2px 2px 4px var(--neu-shadow-dark),
    inset -2px -2px 4px var(--neu-shadow-light);
}

.shadow-neu-focus {
  box-shadow: 
    inset 2px 2px 6px var(--neu-shadow-dark),
    inset -2px -2px 6px var(--neu-shadow-light),
    0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Hover and Active States */
.shadow-neu:hover {
  transform: translateY(-1px);
  box-shadow: 
    10px 10px 20px var(--neu-shadow-dark),
    -10px -10px 20px var(--neu-shadow-light);
}

.shadow-neu:active {
  transform: translateY(1px);
  box-shadow: 
    inset 2px 2px 4px var(--neu-shadow-dark),
    inset -2px -2px 4px var(--neu-shadow-light);
}

/* Note Card Styles */
.note-card {
  background: linear-gradient(145deg, #f0f4f8, #d6e1ea);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 16px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.note-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--neu-accent), var(--neu-accent-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

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

.note-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 
    12px 12px 24px var(--neu-shadow-dark),
    -12px -12px 24px var(--neu-shadow-light);
}

.note-card.pinned {
  background: linear-gradient(145deg, #fef7cd, #f6e96b);
}

.note-card.pinned::before {
  background: linear-gradient(90deg, #f59e0b, #eab308);
}

/* Dark mode styles */
.dark .note-card {
  background: linear-gradient(145deg, #374151, #1f2937);
}

.dark .note-card.pinned {
  background: linear-gradient(145deg, #451a03, #78350f);
}

/* Category Button Styles */
.category-btn {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 12px 16px;
  border-radius: 12px;
  background: transparent;
  border: none;
  text-align: left;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.category-btn:hover {
  background: linear-gradient(145deg, #f8fafc, #e2e8f0);
  box-shadow: 
    4px 4px 8px var(--neu-shadow-dark),
    -4px -4px 8px var(--neu-shadow-light);
}

.category-btn.active {
  background: linear-gradient(145deg, var(--neu-accent), var(--neu-accent-light));
  color: white;
  box-shadow: 
    inset 2px 2px 4px rgba(0,0,0,0.1),
    inset -2px -2px 4px rgba(255,255,255,0.1);
}

.category-btn .category-icon {
  width: 20px;
  margin-right: 12px;
  font-size: 14px;
}

/* Custom Checkbox Styles */
.pin-checkbox {
  position: relative;
  cursor: pointer;
}

#notePinned:checked + .pin-checkbox {
  background: linear-gradient(145deg, var(--neu-accent), var(--neu-accent-light));
  box-shadow: 
    inset 2px 2px 4px rgba(0,0,0,0.1),
    inset -2px -2px 4px rgba(255,255,255,0.1);
}

#notePinned:checked + .pin-checkbox .fas {
  color: white !important;
}

/* Animation Classes */
.fade-in {
  animation: fadeIn 0.3s ease-in-out;
}

.fade-out {
  animation: fadeOut 0.3s ease-in-out;
}

.slide-up {
  animation: slideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide-down {
  animation: slideDown 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.scale-in {
  animation: scaleIn 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

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

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

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

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

/* Responsive Adjustments */
@media (max-width: 768px) {
  #sidebar {
    position: fixed;
    top: 0;
    left: -320px;
    height: 100vh;
    z-index: 30;
    transition: left 0.3s ease;
  }
  
  #sidebar.active {
    left: 0;
  }
  
  .note-card {
    padding: 16px;
  }
  
  .shadow-neu {
    box-shadow: 
      4px 4px 8px var(--neu-shadow-dark),
      -4px -4px 8px var(--neu-shadow-light);
  }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(145deg, #cbd5e0, #a0aec0);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(145deg, #a0aec0, #718096);
}

.dark ::-webkit-scrollbar-thumb {
  background: linear-gradient(145deg, #4a5568, #2d3748);
}

.dark ::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(145deg, #718096, #4a5568);
}

/* Loading Animation */
.loading-spinner {
  border: 3px solid #f3f3f3;
  border-top: 3px solid var(--neu-accent);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
}

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

/* Toast Notification */
.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  background: linear-gradient(145deg, #10b981, #059669);
  color: white;
  padding: 12px 20px;
  border-radius: 12px;
  box-shadow: 
    8px 8px 16px rgba(0,0,0,0.1),
    -8px -8px 16px rgba(255,255,255,0.1);
  transform: translateX(100%);
  transition: transform 0.3s ease;
  z-index: 1000;
}

.toast.show {
  transform: translateX(0);
}

.toast.error {
  background: linear-gradient(145deg, #ef4444, #dc2626);
}

/* Search Highlight */
.search-highlight {
  background: linear-gradient(145deg, #fef3c7, #fde68a);
  padding: 2px 4px;
  border-radius: 4px;
  font-weight: 600;
}