/**
 * Glassmorphic Design System
 * Modern, clean design with frosted glass effects and smooth animations
 * Version: 1.0
 */

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */

:root {
  /* Glass Effects - Light Mode Defaults */
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(0, 0, 0, 0.1);
  --glass-shadow: rgba(0, 0, 0, 0.08);
  --glass-blur: 10px;

  /* Glassmorphic variations */
  --glass-light: rgba(255, 255, 255, 0.9);
  --glass-dark: rgba(0, 0, 0, 0.05);
  --glass-heavy-blur: 20px;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-warm: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  --gradient-cool: linear-gradient(135deg, #30cfd0 0%, #330867 100%);

  /* Status Colors */
  --success-color: #48bb78;
  --error-color: #f56565;
  --warning-color: #ed8936;
  --info-color: #4299e1;

  /* Neumorphic Light */
  --neu-light-bg: linear-gradient(145deg, #f0f0f0, #cacaca);
  --neu-light-shadow-1: 20px 20px 60px #bebebe;
  --neu-light-shadow-2: -20px -20px 60px #ffffff;

  /* Neumorphic Dark */
  --neu-dark-bg: linear-gradient(145deg, #2a2a2a, #1e1e1e);
  --neu-dark-shadow-1: 20px 20px 60px #141414;
  --neu-dark-shadow-2: -20px -20px 60px #303030;

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

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 30px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Z-index layers */
  --z-background: 0;
  --z-default: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;

  /* Layout dimensions */
  --header-height: 50px;
}

/* ============================================
   Keyframe Animations
   ============================================ */

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

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

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

/* Dark mode overrides */
body.dark-mode {
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-shadow: rgba(0, 0, 0, 0.3);
  --glass-light: rgba(255, 255, 255, 0.15);
  --glass-dark: rgba(0, 0, 0, 0.2);
}

/* ============================================
   Glass Card Components
   ============================================ */

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px var(--glass-shadow);
  transition: all var(--transition-base);
  /* GPU acceleration hints for smoother hover transitions */
  will-change: transform, box-shadow;
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 48px var(--glass-shadow);
}

.glass-card-light {
  background: var(--glass-light);
}

.glass-card-dark {
  background: var(--glass-dark);
}

.glass-card-heavy {
  backdrop-filter: blur(var(--glass-heavy-blur));
  -webkit-backdrop-filter: blur(var(--glass-heavy-blur));
}

/* ============================================
   Neumorphic Elements
   ============================================ */

.neu-button {
  background: var(--neu-light-bg);
  box-shadow: var(--neu-light-shadow-1), var(--neu-light-shadow-2);
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  font-weight: 600;
}

.neu-button:hover {
  transform: scale(1.02);
}

.neu-button:active {
  box-shadow: inset var(--neu-light-shadow-1), inset var(--neu-light-shadow-2);
}

body.dark-mode .neu-button {
  background: var(--neu-dark-bg);
  box-shadow: var(--neu-dark-shadow-1), var(--neu-dark-shadow-2);
}

body.dark-mode .neu-button:active {
  box-shadow: inset var(--neu-dark-shadow-1), inset var(--neu-dark-shadow-2);
}

/* ============================================
   Gradient Elements
   ============================================ */

.gradient-primary {
  background: var(--gradient-primary);
}

.gradient-secondary {
  background: var(--gradient-secondary);
}

.gradient-success {
  background: var(--gradient-success);
}

.gradient-warm {
  background: var(--gradient-warm);
}

.gradient-cool {
  background: var(--gradient-cool);
}

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

/* ============================================
   Modal Components
   ============================================ */

.glass-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  z-index: var(--z-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn var(--transition-base);
}

.glass-modal {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-heavy-blur));
  -webkit-backdrop-filter: blur(var(--glass-heavy-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  max-width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  padding: var(--space-xl);
  z-index: var(--z-modal);
  animation: slideUp var(--transition-base);
}

/* ============================================
   Button Styles
   ============================================ */

.glass-button {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  padding: var(--space-sm) var(--space-lg);
  color: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  display: inline-block;
}

.glass-button:hover {
  background: var(--glass-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--glass-shadow);
}

.glass-button:active {
  transform: translateY(0);
}

.glass-button-primary {
  background: var(--gradient-primary);
  color: white;
  border: none;
}

.glass-button-secondary {
  background: var(--gradient-secondary);
  color: white;
  border: none;
}

/* ============================================
   Card Grid Layouts
   ============================================ */

.glass-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
  padding: var(--space-lg);
}

@media (max-width: 768px) {
  .glass-card-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
}

/* ============================================
   Navigation Components
   ============================================ */

.glass-nav {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
  padding: 0.33rem var(--space-lg);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

.glass-nav-item {
  color: inherit;
  text-decoration: none;
  padding: 0.66rem var(--space-md);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: inline-block;
}

.glass-nav-item:hover {
  background: var(--glass-light);
}

.glass-nav-item.active {
  background: var(--glass-light);
  font-weight: 600;
}

/* ============================================
   Form Elements
   ============================================ */

.glass-input {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  color: inherit;
  font-size: 1rem;
  transition: all var(--transition-base);
  width: 100%;
}

.glass-input:focus {
  outline: none;
  border-color: rgba(102, 126, 234, 0.5);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.glass-textarea {
  min-height: 120px;
  resize: vertical;
}

.glass-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='currentColor' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-sm) center;
  padding-right: calc(var(--space-md) + 20px);
}

/* ============================================
   Badge & Tag Components
   ============================================ */

.glass-badge {
  display: inline-block;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  padding: 0.25rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
}

.glass-tag {
  display: inline-block;
  background: var(--gradient-primary);
  color: white;
  border-radius: var(--radius-full);
  padding: 0.25rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  margin: 0.25rem;
}

/* ============================================
   Utility Classes
   ============================================ */

.blur-background {
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.blur-heavy {
  backdrop-filter: blur(var(--glass-heavy-blur));
  -webkit-backdrop-filter: blur(var(--glass-heavy-blur));
}

.frosted {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
}

/* ============================================
   Animations
   ============================================ */

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

@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(0.9);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.fade-in {
  animation: fadeIn var(--transition-base);
}

.slide-up {
  animation: slideUp var(--transition-base);
}

.slide-down {
  animation: slideDown var(--transition-base);
}

.scale-in {
  animation: scaleIn var(--transition-base);
}

/* ============================================
   Responsive Utilities
   ============================================ */

@media (max-width: 768px) {
  .glass-modal {
    max-width: 95%;
    padding: var(--space-lg);
  }

  .glass-card-grid {
    padding: var(--space-sm);
  }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
  .glass-card,
  .glass-modal,
  .glass-button {
    background: white !important;
    backdrop-filter: none !important;
    border: 1px solid #ccc !important;
  }
}

/* ============================================
   Accessibility
   ============================================ */

/* Focus visible for keyboard navigation */
.glass-button:focus-visible,
.glass-input:focus-visible,
.glass-nav-item:focus-visible {
  outline: 2px solid rgba(102, 126, 234, 0.8);
  outline-offset: 2px;
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
  .glass-card,
  .glass-modal,
  .glass-button {
    border-width: 2px;
  }
}