/* CSS Custom Properties for Theming */
:root {
  /* Colors */
  --color-primary: #2563eb;
  --color-secondary: #64748b;
  --color-background: #ffffff;
  --color-surface: #f8fafc;
  --color-text-primary: #1e293b;
  --color-text-secondary: #64748b;
  --color-accent: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  
  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease-out;
  --transition-normal: 200ms ease-out;
  --transition-slow: 300ms ease-in-out;
  
  /* Layout */
  --container-max-width: 1200px;
  --grid-gap: 1.5rem;
}

/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Performance optimizations */
* {
  -webkit-tap-highlight-color: transparent;
}

img {
  max-width: 100%;
  height: auto;
}

/* Fix for any unwanted elements at top-left */
*::before,
*::after {
  box-sizing: border-box;
}

/* Ensure no elements appear outside the viewport */
html, body {
  overflow-x: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
}

html {
  scroll-behavior: smooth;
  position: relative;
  /* Better font rendering */
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header Styles */
.header {
  background: linear-gradient(135deg, var(--color-primary) 0%, #3b82f6 100%);
  color: white;
  padding: var(--spacing-2xl) 0;
  position: relative;
  overflow: hidden;
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 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='%23ffffff' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
  pointer-events: none;
}

.header-content {
  position: relative;
  z-index: 1;
}

.header-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
}

.title-icon {
  font-size: 0.8em;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 53%, 80%, 100% {
    transform: translate3d(0, 0, 0);
  }
  40%, 43% {
    transform: translate3d(0, -8px, 0);
  }
  70% {
    transform: translate3d(0, -4px, 0);
  }
  90% {
    transform: translate3d(0, -2px, 0);
  }
}

.subtitle {
  font-size: 1.125rem;
  opacity: 0.9;
  font-weight: 400;
}

/* Header Title Row with GitHub Link */
.title-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-sm) var(--spacing-md);
  color: white;
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.github-link:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.github-link:hover .github-icon {
  transform: scale(1.1) rotate(5deg);
}

.github-link:active {
  transform: translateY(0);
}

.github-link:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.5);
  outline-offset: 2px;
}

.github-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.github-text {
  font-size: 0.875rem;
}

/* 可选的脉冲动画 - 页面加载时吸引注意 */
.github-link {
  animation: githubPulse 3s ease-in-out 2s;
}

@keyframes githubPulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.4);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(255, 255, 255, 0);
  }
}

/* Controls */
.controls {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  align-items: center;
}

.search-container {
  width: 100%;
  max-width: 500px;
}

.search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: var(--spacing-md);
  color: var(--color-text-secondary);
  pointer-events: none;
  z-index: 2;
}

.search-input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-2xl) var(--spacing-md) 3rem;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  color: white;
  font-size: 1rem;
  transition: var(--transition-normal);
}

.search-input::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

.search-input:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.15);
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.1);
}

.search-clear {
  position: absolute;
  right: var(--spacing-md);
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  opacity: 0;
  pointer-events: none;
}

.search-clear.visible {
  opacity: 1;
  pointer-events: auto;
}

.search-clear:hover {
  color: white;
  background: rgba(255, 255, 255, 0.1);
}

.filter-controls {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
  justify-content: center;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  min-width: 150px;
}

.filter-label {
  font-size: 0.875rem;
  font-weight: 500;
  opacity: 0.9;
}

.filter-select {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  color: white;
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition-normal);
}

.filter-select:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.1);
}

.filter-select option {
  background: var(--color-text-primary);
  color: white;
}

/* Main Content */
.main {
  padding: var(--spacing-2xl) 0;
  min-height: 60vh;
}

/* Stats Bar */
.stats-bar {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
  border: 1px solid var(--color-border-light);
}

.stats-content {
  display: flex;
  justify-content: center;
  gap: var(--spacing-2xl);
  flex-wrap: wrap;
}

.stats-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.875rem;
}

.stats-icon {
  font-size: 1rem;
  margin-right: var(--spacing-xs);
  opacity: 0.8;
  transition: var(--transition-fast);
}

.stats-item:hover .stats-icon {
  opacity: 1;
  transform: scale(1.1);
}

/* Subtle animation for stats icons on load */
@keyframes statsIconPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.stats-icon {
  animation: statsIconPulse 2s ease-in-out infinite;
  animation-delay: calc(var(--index, 0) * 0.2s);
}

.stats-item:nth-child(1) .stats-icon { --index: 0; }
.stats-item:nth-child(2) .stats-icon { --index: 1; }
.stats-item:nth-child(3) .stats-icon { --index: 2; }

.stats-label {
  color: var(--color-text-secondary);
  font-weight: 500;
}

.stats-value {
  color: var(--color-primary);
  font-weight: 600;
}

/* Repository Grid */
.repository-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--grid-gap);
  animation: fadeIn 0.6s ease-out;
}

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

/* Loading State */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  text-align: center;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing-md);
  will-change: transform;
}

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

.loading-text {
  color: var(--color-text-secondary);
  font-size: 1.125rem;
}

/* Empty State */
.empty-state {
  display: flex;
  justify-content: center;
  padding: var(--spacing-2xl);
}

.empty-state-content {
  text-align: center;
  max-width: 400px;
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.5;
}

.empty-state-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.empty-state-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.empty-state-button {
  background: var(--color-primary);
  color: white;
  border: none;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-normal);
}

.empty-state-button:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Error State */
.error-state {
  display: flex;
  justify-content: center;
  padding: var(--spacing-2xl);
}

.error-state-content {
  text-align: center;
  max-width: 400px;
}

.error-state-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
}

.error-state-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-error);
}

.error-state-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.error-state-button {
  background: var(--color-error);
  color: white;
  border: none;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-normal);
}

.error-state-button:hover {
  background: #dc2626;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Footer */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-2xl);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-text {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.footer-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-primary);
}

.footer-separator {
  color: var(--color-border);
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .header {
    padding: var(--spacing-xl) 0;
  }
  
  .title {
    font-size: 2rem;
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .title-row {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .github-link {
    font-size: 0.8125rem;
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .github-icon {
    width: 16px;
    height: 16px;
  }
  
  .subtitle {
    font-size: 1rem;
  }
  
  .controls {
    gap: var(--spacing-md);
  }
  
  .filter-controls {
    width: 100%;
    justify-content: stretch;
  }
  
  .filter-group {
    flex: 1;
    min-width: 120px;
  }
  
  .repository-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .stats-content {
    gap: var(--spacing-md);
    justify-content: space-around;
  }
  
  .stats-item {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-xs);
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  
  /* Better touch targets for mobile */
  .repo-card {
    min-height: 44px;
    touch-action: manipulation;
  }
  
  .filter-select,
  .search-input {
    min-height: 44px;
  }
}

@media (max-width: 480px) {
  .github-link {
    font-size: 0.75rem;
    padding: 6px var(--spacing-xs);
    gap: 4px;
  }
  
  .github-icon {
    width: 14px;
    height: 14px;
  }
  
  .github-text {
    font-size: 0.75rem;
  }
  
  .search-input {
    padding: var(--spacing-sm) var(--spacing-lg) var(--spacing-sm) 2.5rem;
    font-size: 0.875rem;
  }
  
  .search-icon {
    left: var(--spacing-sm);
    width: 16px;
    height: 16px;
  }
  
  .search-clear {
    right: var(--spacing-sm);
  }
  
  .filter-select {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8125rem;
  }
  
  .stats-content {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}

/* Tablet Styles */
@media (min-width: 769px) and (max-width: 1024px) {
  .repository-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .filter-controls {
    gap: var(--spacing-xl);
  }
}

/* Large Desktop */
@media (min-width: 1200px) {
  .repository-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Utility Classes */
.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

/* Focus Styles for Accessibility */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  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;
  }
  
  .title-icon {
    animation: none;
  }
}

/* Preload critical resources */
@media (min-width: 1024px) {
  .repo-card {
    contain: layout style paint;
  }
}

/* Better focus indicators */
.repo-card:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* Smooth scrolling for better UX */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}
/* 
Repository Card Styles */
.repo-card {
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  padding: var(--spacing-lg);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
  animation: slideInUp 0.6s ease-out;
  animation-fill-mode: both;
  /* Performance optimizations */
  will-change: transform;
  contain: layout style paint;
}

.repo-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.repo-card:active {
  transform: translateY(-2px);
  transition-duration: 0.1s;
}

.repo-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition-normal);
}

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

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

/* Card Header */
.repo-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
  gap: var(--spacing-md);
}

.repo-title {
  flex: 1;
  min-width: 0;
}

.repo-name {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  display: block;
  margin-bottom: var(--spacing-xs);
  transition: var(--transition-fast);
  word-break: break-word;
}

.repo-name:hover {
  color: var(--color-primary);
}

.repo-full-name {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
  word-break: break-all;
}

.repo-stars {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: var(--color-surface);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  white-space: nowrap;
  flex-shrink: 0;
}

.star-icon {
  color: var(--color-warning);
  font-size: 1rem;
}

.star-count {
  color: var(--color-text-primary);
  font-weight: 600;
}

/* Repository Description */
.repo-description {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.repo-description:empty {
  display: none;
}

/* Repository Topics */
.repo-topics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
  min-height: 2rem;
}

.topic-tag {
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.topic-tag:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
}

.topic-tag:nth-child(even) {
  background: var(--color-accent);
}

.topic-tag:nth-child(even):hover {
  background: #059669;
}

.topic-tag:nth-child(3n) {
  background: var(--color-secondary);
}

.topic-tag:nth-child(3n):hover {
  background: #475569;
}

/* Repository Footer */
.repo-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border-light);
  margin-top: auto;
}

.repo-owner {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  color: var(--color-text-secondary);
  transition: var(--transition-fast);
  flex: 1;
  min-width: 0;
}

.repo-owner:hover {
  color: var(--color-primary);
}

.owner-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--color-border-light);
  transition: var(--transition-fast);
  flex-shrink: 0;
}

.repo-owner:hover .owner-avatar {
  border-color: var(--color-primary);
  transform: scale(1.1);
}

.owner-name {
  font-size: 0.875rem;
  font-weight: 500;
  truncate: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}

.repo-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.repo-language {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 500;
}

.language-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.repo-updated {
  white-space: nowrap;
}

/* Language Colors */
.language-dot.typescript { background-color: #3178c6; }
.language-dot.javascript { background-color: #f1e05a; }
.language-dot.python { background-color: #3572a5; }
.language-dot.java { background-color: #b07219; }
.language-dot.html { background-color: #e34c26; }
.language-dot.css { background-color: #563d7c; }
.language-dot.scss { background-color: #c6538c; }
.language-dot.vue { background-color: #4fc08d; }
.language-dot.react { background-color: #61dafb; }
.language-dot.go { background-color: #00add8; }
.language-dot.rust { background-color: #dea584; }
.language-dot.php { background-color: #4f5d95; }
.language-dot.ruby { background-color: #701516; }
.language-dot.swift { background-color: #fa7343; }
.language-dot.kotlin { background-color: #a97bff; }
.language-dot.dart { background-color: #00b4ab; }
.language-dot.shell { background-color: #89e051; }
.language-dot.dockerfile { background-color: #384d54; }
.language-dot.default { background-color: var(--color-text-secondary); }

/* External Link Button */
.repo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  transition: var(--transition-fast);
  border: 1px solid var(--color-border);
}

.repo-link:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

.external-icon {
  width: 12px;
  height: 12px;
}

/* Homepage Link */
.repo-homepage {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-accent);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  margin-top: var(--spacing-sm);
  transition: var(--transition-fast);
}

.repo-homepage:hover {
  color: #059669;
  text-decoration: underline;
}

.homepage-icon {
  width: 14px;
  height: 14px;
}

/* Card Animation Delays */
.repo-card:nth-child(1) { animation-delay: 0ms; }
.repo-card:nth-child(2) { animation-delay: 100ms; }
.repo-card:nth-child(3) { animation-delay: 200ms; }
.repo-card:nth-child(4) { animation-delay: 300ms; }
.repo-card:nth-child(5) { animation-delay: 400ms; }
.repo-card:nth-child(6) { animation-delay: 500ms; }
.repo-card:nth-child(n+7) { animation-delay: 600ms; }

/* Language Section Headers */
.language-section {
  grid-column: 1 / -1;
  margin: var(--spacing-xl) 0 var(--spacing-lg) 0;
}

.language-section:first-child {
  margin-top: 0;
}

.language-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-border-light);
}

.language-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.language-count {
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
}

/* Responsive Card Adjustments */
@media (max-width: 768px) {
  .repo-card {
    padding: var(--spacing-md);
  }
  
  .repo-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
  
  .repo-stars {
    align-self: flex-end;
  }
  
  .repo-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
  
  .repo-meta {
    align-self: flex-end;
  }
  
  .language-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .repo-topics {
    gap: var(--spacing-xs);
  }
  
  .topic-tag {
    font-size: 0.6875rem;
    padding: 2px var(--spacing-xs);
  }
  
  .repo-name {
    font-size: 1rem;
  }
  
  .repo-description {
    font-size: 0.875rem;
    -webkit-line-clamp: 2;
  }
}

/* Loading Skeleton for Cards */
.repo-card.skeleton {
  pointer-events: none;
  animation: none;
}

.repo-card.skeleton * {
  background: linear-gradient(90deg, var(--color-border-light) 25%, var(--color-surface) 50%, var(--color-border-light) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  color: transparent !important;
  border-color: transparent !important;
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
  .repo-card {
    border: 2px solid var(--color-text-primary);
  }
  
  .topic-tag {
    border: 1px solid currentColor;
  }
  
  .language-dot {
    border: 1px solid var(--color-text-primary);
  }
}

/* Animation classes for intersection observer */
.repo-card.animate-in {
  animation: slideInUp 0.6s ease-out forwards;
}

/* Improved skeleton loading */
.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--grid-gap);
}

@media (max-width: 768px) {
  .skeleton-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .skeleton-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1200px) {
  .skeleton-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Enhanced Search Styles */
.search-input.searching {
  background: rgba(255, 255, 255, 0.15);
}

.search-input.searching::after {
  content: '';
  position: absolute;
  right: 3rem;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top: 2px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Search suggestions (for future enhancement) */
.search-suggestions {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  max-height: 300px;
  overflow-y: auto;
  display: none;
}

.search-suggestion {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  border-bottom: 1px solid var(--color-border-light);
  transition: var(--transition-fast);
}

.search-suggestion:hover {
  background: var(--color-surface);
}

.search-suggestion:last-child {
  border-bottom: none;
}

.suggestion-text {
  font-size: 0.875rem;
  color: var(--color-text-primary);
}

.suggestion-type {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
}

/* Search highlighting */
.search-highlight {
  background: rgba(37, 99, 235, 0.2);
  padding: 1px 2px;
  border-radius: 2px;
  font-weight: 500;
}

/* No results state enhancements */
.empty-state-suggestions {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border-light);
}

.empty-state-suggestions h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.empty-state-suggestions ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.empty-state-suggestions li {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
  padding-left: var(--spacing-md);
  position: relative;
}

.empty-state-suggestions li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

/* Keyboard navigation indicators */
.search-input:focus + .search-suggestions {
  display: block;
}

.search-suggestion.highlighted {
  background: var(--color-primary);
  color: white;
}

/* Search performance indicator */
.search-stats {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
  text-align: center;
}

.search-time {
  font-weight: 500;
  color: var(--color-primary);
}

/* Language Categorization Controls */
.categorization-controls {
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-lg);
}

.categorization-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
}

.categorization-label {
  font-size: 0.875rem;
  font-weight: 500;
  opacity: 0.9;
  color: white;
}

.categorization-buttons {
  display: flex;
  gap: var(--spacing-xs);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: var(--spacing-xs);
  backdrop-filter: blur(10px);
}

.categorization-btn {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.8);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.categorization-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

.categorization-btn.active {
  background: white;
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

/* Quick Language Filters */
.quick-filters {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  justify-content: center;
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.quick-filters-label {
  font-size: 0.875rem;
  font-weight: 500;
  opacity: 0.9;
  white-space: nowrap;
}

.quick-filter-buttons {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.quick-filter-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.quick-filter-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-1px);
}

.quick-filter-btn.active {
  background: white;
  color: var(--color-primary);
  border-color: white;
}

.quick-filter-btn .language-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.quick-filter-count {
  opacity: 0.8;
  font-size: 0.6875rem;
}

/* Enhanced language filter dropdown */
.filter-select option[data-count] {
  font-family: var(--font-mono);
}

/* Language filter enhancements */
.language-filter-wrapper {
  position: relative;
}

.language-filter-search {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: white;
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  max-height: 200px;
  overflow-y: auto;
  z-index: 100;
  display: none;
}

.language-option {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition-fast);
  border-bottom: 1px solid var(--color-border-light);
}

.language-option:hover {
  background: var(--color-surface);
}

.language-option:last-child {
  border-bottom: none;
}

.language-option-name {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--color-text-primary);
}

.language-option-count {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* Responsive categorization controls */
@media (max-width: 768px) {
  .categorization-controls {
    margin-top: var(--spacing-md);
  }
  
  .categorization-buttons {
    width: 100%;
  }
  
  .categorization-btn {
    flex: 1;
    justify-content: center;
  }
}

/* Responsive quick filters */
@media (max-width: 768px) {
  .quick-filters {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .quick-filters-label {
    align-self: flex-start;
  }
  
  .quick-filter-buttons {
    width: 100%;
    justify-content: flex-start;
  }
  
  .quick-filter-btn {
    flex: 1;
    justify-content: center;
    min-width: 0;
  }
}

@media (max-width: 480px) {
  .quick-filter-buttons {
    flex-direction: column;
  }
  
  .quick-filter-btn {
    width: 100%;
  }
}
/* Enhanced Sort Select */
.filter-select.sorting {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.02);
}

.sort-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
}

.sort-arrow {
  transition: var(--transition-fast);
}

.sort-arrow.desc {
  transform: rotate(180deg);
}

/* Sort options styling */
.filter-select option {
  padding: var(--spacing-sm);
  font-size: 0.875rem;
}

.filter-select option:hover {
  background: var(--color-surface);
}

/* Advanced sort controls (for future enhancement) */
.sort-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.sort-direction-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
}

.sort-direction-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
}

.sort-direction-btn.active {
  background: white;
  color: var(--color-primary);
  border-color: white;
}

/* Sort performance indicator */
.sort-performance {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
  text-align: center;
  opacity: 0;
  transition: var(--transition-normal);
}

.sort-performance.visible {
  opacity: 1;
}

/* Repository count by sort */
.sort-stats {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
}

.sort-stat-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.sort-stat-value {
  font-weight: 600;
  color: var(--color-primary);
}

/* Responsive sort controls */
@media (max-width: 480px) {
  .filter-select {
    font-size: 0.8125rem;
  }
  
  .sort-controls {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  
  .sort-direction-btn {
    width: 100%;
    height: auto;
    padding: var(--spacing-xs) var(--spacing-sm);
  }
}/* Adv
anced UI Interactions and Animations */

/* Smooth page transitions */
.page-transition {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.page-transition.loaded {
  opacity: 1;
  transform: translateY(0);
}

/* Enhanced loading animations */
.loading-dots {
  display: inline-flex;
  gap: 4px;
  align-items: center;
}

.loading-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  animation: loadingDots 1.4s infinite ease-in-out;
}

.loading-dot:nth-child(1) { animation-delay: -0.32s; }
.loading-dot:nth-child(2) { animation-delay: -0.16s; }
.loading-dot:nth-child(3) { animation-delay: 0s; }

@keyframes loadingDots {
  0%, 80%, 100% {
    transform: scale(0.8);
    opacity: 0.5;
  }
  40% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Filter transition animations */
.filter-transition {
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.filter-transition.filtering {
  opacity: 0.7;
  transform: scale(0.98);
}

/* Repository grid animations */
.repository-grid.updating {
  opacity: 0.8;
  pointer-events: none;
}

.repository-grid.updated {
  animation: gridUpdate 0.5s ease-out;
}

@keyframes gridUpdate {
  0% {
    opacity: 0.8;
    transform: translateY(10px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Card hover enhancements */
.repo-card {
  transform-origin: center;
  will-change: transform, box-shadow;
}

.repo-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 
    0 20px 40px -12px rgba(0, 0, 0, 0.15),
    0 8px 16px -8px rgba(0, 0, 0, 0.1);
}

.repo-card:hover .repo-name {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: var(--color-primary);
  text-underline-offset: 2px;
}

.repo-card:hover .owner-avatar {
  transform: scale(1.15);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.repo-card:hover .topic-tag {
  transform: translateY(-2px);
}

/* Interactive elements feedback */
.interactive-feedback {
  position: relative;
  overflow: hidden;
}

.interactive-feedback::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.3s ease-out, height 0.3s ease-out;
  pointer-events: none;
}

.interactive-feedback:active::after {
  width: 200px;
  height: 200px;
}

/* Search input enhancements */
.search-input:focus {
  transform: scale(1.02);
  box-shadow: 
    0 0 0 4px rgba(255, 255, 255, 0.1),
    0 8px 24px rgba(0, 0, 0, 0.15);
}

.search-wrapper:focus-within .search-icon {
  color: white;
  transform: scale(1.1);
}

/* Filter select animations */
.filter-select {
  transform-origin: center;
  transition: all 0.2s ease-out;
}

.filter-select:focus,
.filter-select:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Quick filter button animations */
.quick-filter-btn {
  transform-origin: center;
  position: relative;
}

.quick-filter-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform 0.6s ease-out;
  pointer-events: none;
}

.quick-filter-btn:hover::before {
  transform: translateX(100%);
}

.quick-filter-btn:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.quick-filter-btn.active {
  animation: activeFilter 0.3s ease-out;
}

@keyframes activeFilter {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1.05); }
}

/* Statistics bar animations */
.stats-item {
  transition: all 0.3s ease-out;
}

.stats-item:hover {
  transform: translateY(-2px);
}

.stats-value {
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.stats-value.updating {
  transform: scale(1.2);
  color: var(--color-accent);
}

/* Language section animations */
.language-section {
  animation: sectionSlideIn 0.6s ease-out;
}

@keyframes sectionSlideIn {
  0% {
    opacity: 0;
    transform: translateX(-30px);
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}

.language-header {
  position: relative;
}

.language-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  width: 0;
  transition: width 0.8s ease-out;
}

.language-section:hover .language-header::after {
  width: 100%;
}

/* Empty state animations */
.empty-state-content {
  animation: emptyStateFloat 3s ease-in-out infinite;
}

@keyframes emptyStateFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.empty-state-icon {
  animation: emptyStateRotate 4s ease-in-out infinite;
}

@keyframes emptyStateRotate {
  0%, 100% { transform: rotate(0deg) scale(1); }
  25% { transform: rotate(-5deg) scale(1.05); }
  75% { transform: rotate(5deg) scale(1.05); }
}

/* Error state animations */
.error-state-icon {
  animation: errorPulse 2s ease-in-out infinite;
}

@keyframes errorPulse {
  0%, 100% { 
    transform: scale(1);
    filter: brightness(1);
  }
  50% { 
    transform: scale(1.1);
    filter: brightness(1.2);
  }
}

/* Button press animations */
.btn-press {
  transition: all 0.1s ease-out;
}

.btn-press:active {
  transform: scale(0.95);
}

/* Scroll-based animations */
.scroll-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Micro-interactions */
.micro-bounce {
  transition: transform 0.2s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.micro-bounce:hover {
  transform: scale(1.05);
}

.micro-bounce:active {
  transform: scale(0.95);
}

/* Loading progress bar */
.loading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--color-surface);
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.3s ease-out;
  visibility: hidden;
  transition: opacity 0.3s ease-out, visibility 0.3s ease-out;
}

.loading-progress.visible {
  opacity: 1;
  visibility: visible;
}

.loading-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  width: 0%;
  transition: width 0.3s ease-out;
  position: relative;
}

.loading-progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: progressShine 1.5s ease-in-out infinite;
}

@keyframes progressShine {
  0% { transform: translateX(-100px); }
  100% { transform: translateX(100px); }
}

/* Toast Notification System - Modern & Interactive */
.toast-container {
  position: fixed;
  top: 40px;
  right: 20px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  pointer-events: none;
  max-width: 420px;
}

.toast {
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15), 0 4px 12px rgba(0, 0, 0, 0.1);
  border: none;
  overflow: hidden;
  transform: translateX(100%) scale(0.95);
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: auto;
  max-width: 100%;
  min-width: 320px;
  backdrop-filter: blur(20px);
  position: relative;
}

.toast.toast-visible {
  transform: translateX(0) scale(1);
  opacity: 1;
}

.toast.toast-removing {
  transform: translateX(100%) scale(0.9);
  opacity: 0;
  margin-bottom: calc(-1 * (var(--spacing-lg) * 2 + 1.5rem + var(--spacing-sm)));
  transition: all 0.3s ease-in;
}

.toast-content {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: 16px 20px;
  position: relative;
}

.toast-icon {
  font-size: 20px;
  font-weight: bold;
  flex-shrink: 0;
  margin-top: 1px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
}

.toast-message {
  flex: 1;
  font-size: 14px;
  line-height: 1.5;
  font-weight: 500;
  word-wrap: break-word;
  margin-top: 1px;
}

.toast-close {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  font-size: 16px;
  cursor: pointer;
  padding: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  line-height: 1;
  font-weight: bold;
}

.toast-close:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

/* Toast Type Styles - Modern Gradient Backgrounds */
.toast-success {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: white;
}

.toast-success .toast-icon {
  background: rgba(255, 255, 255, 0.25);
  color: white;
}

.toast-success .toast-message {
  color: white;
}

.toast-success .toast-close {
  color: white;
}

.toast-error {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  color: white;
}

.toast-error .toast-icon {
  background: rgba(255, 255, 255, 0.25);
  color: white;
}

.toast-error .toast-message {
  color: white;
}

.toast-error .toast-close {
  color: white;
}

.toast-warning {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: white;
}

.toast-warning .toast-icon {
  background: rgba(255, 255, 255, 0.25);
  color: white;
}

.toast-warning .toast-message {
  color: white;
}

.toast-warning .toast-close {
  color: white;
}

.toast-info {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  color: white;
}

.toast-info .toast-icon {
  background: rgba(255, 255, 255, 0.25);
  color: white;
}

.toast-info .toast-message {
  color: white;
}

.toast-info .toast-close {
  color: white;
}

/* Toast Progress Bar - Enhanced */
.toast::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  background: rgba(255, 255, 255, 0.4);
  border-radius: 0 0 12px 12px;
  animation: toastProgress linear var(--toast-duration, 3000ms);
  animation-fill-mode: forwards;
}

@keyframes toastProgress {
  from {
    width: 100%;
  }
  to {
    width: 0%;
  }
}

/* Toast Hover Effects */
.toast:hover {
  transform: translateX(0) scale(1.02);
  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.2), 0 6px 20px rgba(0, 0, 0, 0.15);
}

.toast:hover::after {
  animation-play-state: paused;
}

/* Toast Icon Animations */
.toast-icon {
  animation: toastIconBounce 0.6s ease-out;
}

@keyframes toastIconBounce {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Toast Message Animation */
.toast-message {
  animation: toastMessageSlide 0.4s ease-out 0.1s both;
}

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

/* Toast Close Button Enhanced */
.toast-close {
  opacity: 0.8;
  transition: all 0.2s ease;
}

.toast-close:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1) rotate(90deg);
}

.toast-close:active {
  transform: scale(0.95) rotate(90deg);
}

/* Mobile Toast Styles - Enhanced */
@media (max-width: 768px) {
  .toast-container {
    top: 10px;
    right: 10px;
    left: 10px;
    max-width: none;
  }
  
  .toast {
    min-width: auto;
    width: 100%;
    border-radius: 10px;
  }
  
  .toast-content {
    padding: 14px 16px;
  }
  
  .toast-message {
    font-size: 13px;
  }
  
  .toast-icon {
    font-size: 18px;
    width: 22px;
    height: 22px;
  }
  
  .toast-close {
    width: 22px;
    height: 22px;
    font-size: 14px;
  }
}

/* Accessibility Enhancements */
.toast {
  role: alert;
  aria-live: polite;
}

.toast-error {
  aria-live: assertive;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  .toast {
    transition: opacity 0.2s ease;
    transform: none !important;
  }
  
  .toast-icon,
  .toast-message {
    animation: none;
  }
  
  .toast::after {
    animation: none;
  }
  
  .toast:hover {
    transform: none;
  }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  .toast {
    border: 2px solid white;
  }
  
  .toast-close {
    border: 1px solid rgba(255, 255, 255, 0.5);
  }
}

/* Toast Test Buttons (Development Only) */
.toast-test-buttons {
  display: flex;
  gap: 10px;
  margin-top: 15px;
  justify-content: center;
  flex-wrap: wrap;
}

.test-btn {
  padding: 8px 16px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: white;
  transition: all 0.2s ease;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.test-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

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

.test-btn-success {
  background: linear-gradient(135deg, #10b981, #059669);
}

.test-btn-error {
  background: linear-gradient(135deg, #ef4444, #dc2626);
}

.test-btn-warning {
  background: linear-gradient(135deg, #f59e0b, #d97706);
}

.test-btn-info {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
}

@media (max-width: 768px) {
  .toast-test-buttons {
    gap: 8px;
  }
  
  .test-btn {
    padding: 6px 12px;
    font-size: 12px;
    flex: 1;
    min-width: 0;
  }
}

/* Parallax effect for header */
.header {
  position: relative;
  overflow: hidden;
}

.header-parallax {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 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%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpolygon points='50 0 60 40 100 50 60 60 50 100 40 60 0 50 40 40'/%3E%3C/g%3E%3C/svg%3E") repeat;
  animation: parallaxFloat 20s linear infinite;
  pointer-events: none;
}

@keyframes parallaxFloat {
  0% { transform: translateX(0) translateY(0); }
  100% { transform: translateX(-100px) translateY(-100px); }
}

/* Performance optimizations */
.gpu-accelerated {
  transform: translateZ(0);
  backface-visibility: hidden;
  perspective: 1000px;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .repo-card,
  .filter-transition,
  .interactive-feedback,
  .quick-filter-btn,
  .stats-value,
  .language-section,
  .empty-state-content,
  .error-state-icon,
  .loading-progress-bar,
  .toast,
  .header-parallax {
    animation: none !important;
    transition: none !important;
  }
  
  .repo-card:hover {
    transform: none;
  }
  
  .quick-filter-btn:hover {
    transform: none;
  }
}

/* Enhanced Mobile Optimizations */

/* Touch-friendly interactions */
@media (hover: none) and (pointer: coarse) {
  .repo-card:hover {
    transform: none;
    box-shadow: var(--shadow-md);
  }
  
  .repo-card:active {
    transform: scale(0.98);
    transition: transform 0.1s ease-out;
  }
  
  .quick-filter-btn:hover {
    transform: none;
  }
  
  .quick-filter-btn:active {
    transform: scale(0.95);
  }
  
  .search-input:focus {
    transform: none;
  }
  
  .filter-select:hover {
    transform: none;
  }
}

/* Mobile-specific layouts */
@media (max-width: 768px) {
  /* Header optimizations */
  .header {
    padding: var(--spacing-lg) 0;
  }
  
  .title {
    font-size: 1.75rem;
    line-height: 1.2;
  }
  
  .subtitle {
    font-size: 1rem;
    line-height: 1.4;
  }
  
  /* Search optimizations */
  .search-input {
    font-size: 16px; /* Prevent zoom on iOS */
    padding: var(--spacing-md) var(--spacing-lg) var(--spacing-md) 2.75rem;
  }
  
  .search-icon {
    left: var(--spacing-md);
    width: 18px;
    height: 18px;
  }
  
  .search-clear {
    right: var(--spacing-md);
    padding: var(--spacing-sm);
  }
  
  /* Filter controls mobile layout */
  .filter-controls {
    width: 100%;
    gap: var(--spacing-md);
  }
  
  .filter-group {
    flex: 1;
    min-width: 0;
  }
  
  .filter-select {
    width: 100%;
    font-size: 14px;
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  /* Quick filters mobile layout */
  .quick-filters {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
  }
  
  .quick-filter-buttons {
    width: 100%;
    justify-content: flex-start;
    gap: var(--spacing-sm);
  }
  
  .quick-filter-btn {
    flex: 0 0 auto;
    font-size: 0.75rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    min-height: 32px;
  }
  
  /* Stats bar mobile */
  .stats-content {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
  
  .stats-item {
    justify-content: center;
  }
  
  /* Repository cards mobile */
  .repo-card {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
  }
  
  .repo-header {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-sm);
  }
  
  .repo-stars {
    align-self: flex-end;
    margin-top: var(--spacing-xs);
  }
  
  .repo-name {
    font-size: 1.125rem;
    line-height: 1.3;
  }
  
  .repo-description {
    font-size: 0.9375rem;
    line-height: 1.5;
    -webkit-line-clamp: 3;
  }
  
  .repo-topics {
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
  }
  
  .topic-tag {
    font-size: 0.6875rem;
    padding: 2px var(--spacing-xs);
  }
  
  .repo-footer {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-sm);
  }
  
  .repo-owner {
    justify-content: flex-start;
  }
  
  .repo-meta {
    justify-content: space-between;
    align-self: stretch;
  }
  
  /* Language sections mobile */
  .language-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
    text-align: left;
  }
  
  .language-title {
    font-size: 1.25rem;
  }
  
  /* Empty state mobile */
  .empty-state-content {
    padding: var(--spacing-md);
  }
  
  .empty-state-icon {
    font-size: 3rem;
  }
  
  .empty-state-title {
    font-size: 1.25rem;
  }
  
  .empty-state-description {
    font-size: 0.9375rem;
  }
  
  .empty-state-suggestions {
    text-align: left;
  }
  
  .empty-state-suggestions ul {
    padding-left: var(--spacing-md);
  }
  
  .empty-state-suggestions li {
    font-size: 0.8125rem;
    margin-bottom: var(--spacing-xs);
  }
  
  /* Footer mobile */
  .footer-content {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
  
  .footer-text,
  .footer-link {
    font-size: 0.8125rem;
  }
}

/* Small mobile devices */
@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  /* Header extra small */
  .header {
    padding: var(--spacing-md) 0;
  }
  
  .title {
    font-size: 1.5rem;
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  
  .title-icon {
    font-size: 1.25rem;
  }
  
  .subtitle {
    font-size: 0.9375rem;
  }
  
  /* Controls extra small */
  .controls {
    gap: var(--spacing-md);
  }
  
  .search-input {
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 2.5rem;
    font-size: 15px;
  }
  
  .filter-controls {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .filter-group {
    width: 100%;
  }
  
  .filter-select {
    padding: var(--spacing-sm);
    font-size: 0.8125rem;
  }
  
  /* Quick filters extra small */
  .quick-filters {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-sm);
  }
  
  .quick-filters-label {
    text-align: center;
  }
  
  .quick-filter-buttons {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  
  .quick-filter-btn {
    width: 100%;
    justify-content: center;
    padding: var(--spacing-sm);
  }
  
  /* Repository grid extra small */
  .repository-grid {
    gap: var(--spacing-md);
  }
  
  .repo-card {
    padding: var(--spacing-sm);
  }
  
  .repo-name {
    font-size: 1rem;
  }
  
  .repo-full-name {
    font-size: 0.8125rem;
  }
  
  .repo-description {
    font-size: 0.875rem;
    -webkit-line-clamp: 2;
  }
  
  .repo-stars {
    font-size: 0.8125rem;
  }
  
  .topic-tag {
    font-size: 0.625rem;
    padding: 1px 6px;
  }
  
  .owner-avatar {
    width: 20px;
    height: 20px;
  }
  
  .owner-name {
    font-size: 0.8125rem;
  }
  
  .repo-meta {
    font-size: 0.6875rem;
  }
  
  /* Language sections extra small */
  .language-title {
    font-size: 1.125rem;
  }
  
  .language-count {
    font-size: 0.8125rem;
  }
  
  /* Toast mobile */
  .toast {
    bottom: 10px;
    right: 10px;
    left: 10px;
    max-width: none;
    font-size: 0.875rem;
  }
}

/* Landscape mobile optimization */
@media (max-width: 768px) and (orientation: landscape) {
  .header {
    padding: var(--spacing-md) 0;
  }
  
  .title {
    font-size: 1.5rem;
  }
  
  .subtitle {
    font-size: 0.9375rem;
  }
  
  .controls {
    gap: var(--spacing-md);
  }
  
  .filter-controls {
    flex-direction: row;
  }
  
  .quick-filters {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
  }
  
  .quick-filter-buttons {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .owner-avatar {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
  
  .search-icon,
  .homepage-icon {
    stroke-width: 1.5;
  }
}

/* Dark mode support (system preference) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #0f172a;
    --color-surface: #1e293b;
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-border: #334155;
    --color-border-light: #475569;
  }
  
  .repo-card {
    background: var(--color-surface);
    border-color: var(--color-border);
  }
  
  .repo-card:hover {
    border-color: var(--color-primary);
  }
  
  .stats-bar {
    background: var(--color-surface);
    border-color: var(--color-border);
  }
  
  .footer {
    background: var(--color-surface);
    border-color: var(--color-border);
  }
}

/* Print styles */
@media print {
  .header,
  .controls,
  .stats-bar,
  .footer,
  .loading-state,
  .empty-state,
  .error-state,
  .toast,
  .loading-progress {
    display: none !important;
  }
  
  .repo-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
    margin-bottom: var(--spacing-md);
  }
  
  .repo-card:hover {
    transform: none;
    box-shadow: none;
  }
  
  .repository-grid {
    display: block;
  }
  
  .language-section {
    break-inside: avoid;
  }
  
  .topic-tag {
    border: 1px solid #ccc;
    background: transparent;
    color: #333;
  }
}

/* Accessibility enhancements */
@media (prefers-contrast: high) {
  :root {
    --color-primary: #0066cc;
    --color-accent: #008800;
    --color-error: #cc0000;
    --color-warning: #cc6600;
  }
  
  .repo-card {
    border: 2px solid var(--color-border);
  }
  
  .repo-card:hover,
  .repo-card:focus-within {
    border-color: var(--color-primary);
    border-width: 3px;
  }
  
  .topic-tag {
    border: 1px solid currentColor;
  }
  
  .quick-filter-btn {
    border: 2px solid rgba(255, 255, 255, 0.5);
  }
  
  .quick-filter-btn.active {
    border-color: white;
    border-width: 3px;
  }
}

/* Focus management for keyboard navigation */
.repo-card:focus {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.quick-filter-btn:focus {
  outline: 2px solid white;
  outline-offset: 2px;
}

/* Safe area insets for devices with notches */
@supports (padding: max(0px)) {
  .container {
    padding-left: max(var(--spacing-md), env(safe-area-inset-left));
    padding-right: max(var(--spacing-md), env(safe-area-inset-right));
  }
  
  .header {
    padding-top: max(var(--spacing-2xl), env(safe-area-inset-top));
  }
  
  .footer {
    padding-bottom: max(var(--spacing-xl), env(safe-area-inset-bottom));
  }
  
  .toast {
    bottom: max(20px, env(safe-area-inset-bottom) + 10px);
    right: max(20px, env(safe-area-inset-right) + 10px);
  }
  
  @media (max-width: 480px) {
    .toast {
      left: max(10px, env(safe-area-inset-left) + 10px);
      right: max(10px, env(safe-area-inset-right) + 10px);
    }
  }
}

/* Touch feedback styles */
.repo-card.touching {
  transform: scale(0.98);
  transition: transform 0.1s ease-out;
}

/* Viewport-based custom properties */
:root {
  --viewport-width: 100vw;
  --viewport-height: 100vh;
}

/* Performance optimizations for mobile */
@media (max-width: 768px) {
  .repo-card {
    will-change: transform;
    transform: translateZ(0);
  }
  
  .repository-grid {
    contain: layout style paint;
  }
  
  .search-input {
    will-change: transform;
  }
  
  .quick-filter-btn {
    will-change: transform;
  }
}

/* Smooth scrolling for supported browsers */
@supports (scroll-behavior: smooth) {
  html {
    scroll-behavior: smooth;
  }
}

/* Container queries support (future enhancement) */
@supports (container-type: inline-size) {
  .repo-card {
    container-type: inline-size;
  }
  
  @container (max-width: 300px) {
    .repo-header {
      flex-direction: column;
    }
    
    .repo-stars {
      align-self: flex-end;
    }
  }
}/* 
Accessibility Styles */

/* Screen reader only content */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip links */
.skip-links {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 10000;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-text-primary);
  color: white;
  padding: 8px 16px;
  text-decoration: none;
  border-radius: 4px;
  font-weight: 600;
  transition: top 0.3s ease-out;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-100%);
}

.skip-link:focus {
  top: 6px;
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}


/* Enhanced focus indicators */
*:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

/* High contrast focus for repository cards */
.repo-card:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 4px;
  box-shadow: 
    0 0 0 6px rgba(37, 99, 235, 0.2),
    var(--shadow-lg);
}

/* Focus indicators for interactive elements */
.search-input:focus-visible {
  outline: 3px solid white;
  outline-offset: 2px;
  box-shadow: 
    0 0 0 6px rgba(255, 255, 255, 0.3),
    0 8px 24px rgba(0, 0, 0, 0.15);
}

.filter-select:focus-visible {
  outline: 3px solid white;
  outline-offset: 2px;
  box-shadow: 0 0 0 6px rgba(255, 255, 255, 0.3);
}

.quick-filter-btn:focus-visible {
  outline: 3px solid white;
  outline-offset: 2px;
  box-shadow: 0 0 0 6px rgba(255, 255, 255, 0.3);
}

/* Button focus states */
.empty-state-button:focus-visible,
.error-state-button:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 6px rgba(37, 99, 235, 0.2);
}

/* Link focus states */
.repo-name:focus-visible,
.repo-owner:focus-visible,
.topic-tag:focus-visible,
.repo-homepage:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Keyboard navigation indicators */
.repo-card[data-keyboard-focused="true"] {
  transform: translateY(-2px);
  box-shadow: 
    0 0 0 3px var(--color-primary),
    var(--shadow-lg);
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  .skip-link {
    transition: none;
  }
  
  .repo-card:focus-visible {
    transform: none;
  }
  
  *:focus-visible {
    transition: none;
  }
}

/* High contrast mode enhancements */
@media (prefers-contrast: high) {
  .skip-link {
    background: #000000;
    color: #ffffff;
    border: 2px solid #ffffff;
  }
  
  .repo-card:focus-visible {
    outline: 4px solid #000000;
    outline-offset: 2px;
  }
  
  .search-input:focus-visible,
  .filter-select:focus-visible,
  .quick-filter-btn:focus-visible {
    outline: 4px solid #ffffff;
    outline-offset: 2px;
  }
  
  .repo-name:focus-visible,
  .repo-owner:focus-visible,
  .topic-tag:focus-visible {
    outline: 3px solid #000000;
    outline-offset: 1px;
    background: #ffffff;
  }
}

/* Color blind friendly enhancements */
.language-dot {
  border: 1px solid rgba(0, 0, 0, 0.1);
}

.topic-tag {
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.repo-stars {
  border: 1px solid var(--color-border-light);
}

/* ARIA live regions styling */
[aria-live] {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* Focus trap for modals (if implemented) */
.focus-trap {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
}

.focus-trap-content {
  background: white;
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  max-width: 90vw;
  max-height: 90vh;
  overflow: auto;
  position: relative;
}

.focus-trap-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
}

.focus-trap-close:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Keyboard navigation hints */
.keyboard-hint {
  position: fixed;
  bottom: 20px;
  left: 20px;
  background: var(--color-text-primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.3s ease-out, transform 0.3s ease-out;
  z-index: 1000;
  max-width: 300px;
}

.keyboard-hint.visible {
  opacity: 1;
  transform: translateY(0);
}

.keyboard-hint kbd {
  background: rgba(255, 255, 255, 0.2);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: monospace;
  font-size: 0.8125rem;
}

/* Error states for accessibility */
.error-message {
  color: var(--color-error);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.error-message::before {
  content: '⚠️';
  font-size: 1rem;
}

/* Success states for accessibility */
.success-message {
  color: var(--color-accent);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.success-message::before {
  content: '✅';
  font-size: 1rem;
}

/* Loading states for accessibility */
.loading-message {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.loading-message::before {
  content: '⏳';
  font-size: 1rem;
  animation: spin 2s linear infinite;
}

/* Mobile accessibility enhancements */
@media (max-width: 768px) {
  .skip-link {
    font-size: 0.875rem;
    padding: 6px 12px;
  }
  
  .repo-card:focus-visible {
    outline-offset: 2px;
  }
  
  .keyboard-hint {
    bottom: 10px;
    left: 10px;
    right: 10px;
    max-width: none;
    font-size: 0.8125rem;
  }
}

/* Print accessibility */
@media print {
  .skip-links,
  .keyboard-hint,
  [aria-live],
  .sr-only {
    display: none !important;
  }
  
  .repo-card:focus-visible {
    outline: none;
    box-shadow: none;
  }
}
/* Performance Optimizations */

/* GPU acceleration for key elements */
.repo-card,
.search-input,
.filter-select,
.quick-filter-btn,
.loading-spinner {
  transform: translateZ(0);
  backface-visibility: hidden;
  perspective: 1000px;
}

/* Optimize repaints and reflows */
.repo-card {
  contain: layout style paint;
  will-change: transform, opacity;
}

.repository-grid {
  contain: layout style;
}

/* Image loading optimizations */
.owner-avatar {
  background: var(--color-surface);
  transition: opacity 0.3s ease-out;
}

.owner-avatar:not(.loaded) {
  opacity: 0.7;
}

.owner-avatar.loaded {
  opacity: 1;
}

.owner-avatar.error {
  opacity: 0.5;
  filter: grayscale(100%);
}

/* Lazy loading placeholder */
.owner-avatar[data-src] {
  background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-border-light) 50%, var(--color-surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

/* Virtual scrolling optimizations */
.virtual-scroll-container {
  height: 100vh;
  overflow-y: auto;
  position: relative;
}

.virtual-scroll-content {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
}

/* Memory optimization */
.repo-card.offscreen {
  visibility: hidden;
  pointer-events: none;
}

/* Critical CSS inlining hint */
.above-fold {
  critical: true;
}

/* Preload hints for fonts */
@font-face {
  font-family: 'Inter';
  font-display: swap;
  src: url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');
}

/* Optimize animations for performance */
@media (prefers-reduced-motion: no-preference) {
  .repo-card {
    animation-fill-mode: both;
    animation-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  }
}

/* Resource hints */
.preload-hint {
  content: '';
  display: none;
  background-image: 
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='%23cbd5e1'%3E%3Cpath d='M12 12c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm0 2c-2.67 0-8 1.34-8 4v2h16v-2c0-2.66-5.33-4-8-4z'/%3E%3C/svg%3E");
}

/* Optimize for different connection speeds */
@media (prefers-reduced-data) {
  .owner-avatar {
    display: none;
  }
  
  .repo-card::before {
    display: none;
  }
  
  .header-parallax {
    display: none;
  }
  
  .loading-progress-bar::after {
    display: none;
  }
}

/* Battery optimization */
@media (prefers-reduced-motion: reduce) {
  .repo-card,
  .loading-spinner,
  .loading-progress-bar,
  .header-parallax {
    animation: none !important;
    transition: none !important;
  }
}

/* Network-aware optimizations */
.slow-connection .owner-avatar {
  width: 20px;
  height: 20px;
}

.slow-connection .repo-card::before {
  display: none;
}

.slow-connection .loading-progress-bar::after {
  display: none;
}

/* Print optimizations */
@media print {
  * {
    animation: none !important;
    transition: none !important;
    transform: none !important;
    box-shadow: none !important;
  }
  
  .repo-card {
    break-inside: avoid;
    page-break-inside: avoid;
  }
}

/* High refresh rate displays */
@media (min-resolution: 120dpi) {
  .repo-card {
    animation-duration: 0.4s;
  }
  
  .loading-spinner {
    animation-duration: 0.8s;
  }
}

/* Memory-constrained devices */
@media (max-device-memory: 2) {
  .repo-card::before {
    display: none;
  }
  
  .header-parallax {
    display: none;
  }
  
  .loading-progress-bar::after {
    display: none;
  }
}

/* CPU optimization */
.cpu-intensive {
  will-change: auto;
  transform: none;
}

/* Final polish styles */
.polished {
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Error recovery styles */
.error-recovery {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--color-error);
  color: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  text-align: center;
  z-index: 10000;
  max-width: 400px;
}

.error-recovery button {
  background: white;
  color: var(--color-error);
  border: none;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-md);
  cursor: pointer;
  font-weight: 600;
}

/* Performance monitoring overlay (development only) */
.perf-monitor {
  position: fixed;
  top: 10px;
  right: 10px;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-family: monospace;
  font-size: 0.75rem;
  z-index: 9999;
  display: none;
}

.perf-monitor.visible {
  display: block;
}

.perf-metric {
  margin-bottom: var(--spacing-xs);
}

.perf-metric-label {
  opacity: 0.7;
}

.perf-metric-value {
  font-weight: bold;
  color: #00ff00;
}

.perf-metric-value.warning {
  color: #ffff00;
}

.perf-metric-value.error {
  color: #ff0000;
}