/* ===== CSS VARIABLES ===== */
:root {
  /* Colors - Light Theme */
  --primary-color: #0b63d4;
  --primary-hover: #0951b8;
  --accent-color: #14b8a6;
  --accent-hover: #0f9488;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  
  --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);
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Layout */
  --container-max-width: 1200px;
  --header-height: 120px;
}

/* Dark Theme */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  
  --border-color: #334155;
  --border-hover: #475569;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.3), 0 8px 10px -6px rgb(0 0 0 / 0.3);
}

/* ===== RESET & BASE STYLES ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== ACCESSIBILITY ===== */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus styles */
*:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ===== LAYOUT ===== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* ===== HEADER ===== */
.header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.header-content {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  position: relative;
  padding: var(--space-6) 0;
}


.logo-section {
  display: flex;
  align-items: center;
}

.brand-container {
  position: relative;
}

.logo-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.logo-wrapper:hover {
  transform: translateY(-2px);
}

.logo-icon-container {
  position: relative;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-icon {
  width: 44px;
  height: 44px;
  color: var(--primary-color);
  transition: all var(--transition-normal);
  z-index: 2;
  position: relative;
}

.logo-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  background: radial-gradient(circle, var(--primary-color)20, transparent 70%);
  border-radius: 50%;
  opacity: 0.3;
  animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.3; }
  50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.6; }
}

.logo-wrapper:hover .logo-icon {
  transform: rotate(180deg) scale(1.1);
  color: var(--accent-color);
}

.logo-wrapper:hover .logo-glow {
  animation-duration: 1s;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.logo-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.1;
  margin: 0;
  display: flex;
  flex-direction: column;
}

.logo-main {
  color: var(--text-primary);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.logo-accent {
  color: var(--primary-color);
  font-weight: 600;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-top: -4px;
}

.tagline-container {
  position: relative;
  overflow: hidden;
}

.tagline {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  letter-spacing: 0.5px;
  position: relative;
}

.tagline-icon {
  font-size: var(--font-size-base);
  animation: sparkle 2s ease-in-out infinite;
}

@keyframes sparkle {
  0%, 100% { transform: scale(1) rotate(0deg); opacity: 0.8; }
  50% { transform: scale(1.2) rotate(180deg); opacity: 1; }
}

.tagline-pulse {
  position: absolute;
  right: -10px;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: var(--accent-color);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 0; transform: translateY(-50%) scale(0); }
  50% { opacity: 1; transform: translateY(-50%) scale(1); }
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  position: fixed;
  right: var(--space-4);
  top: calc(var(--header-height) / 2);
  transform: translateY(-50%);
  z-index: 101;
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  position: relative;
  width: 44px;
  height: 44px;
}

.theme-toggle:hover {
  border-color: var(--border-hover);
  background: var(--bg-secondary);
}

.theme-icon {
  transition: all var(--transition-fast);
  position: absolute;
}

.sun-icon {
  opacity: 1;
  transform: rotate(0deg);
}

.moon-icon {
  opacity: 0;
  transform: rotate(180deg);
}

[data-theme="dark"] .sun-icon {
  opacity: 0;
  transform: rotate(180deg);
}

[data-theme="dark"] .moon-icon {
  opacity: 1;
  transform: rotate(0deg);
}

/* Favorites Toggle */
.favorites-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: all var(--transition-fast);
  position: relative;
  color: var(--text-primary);
}

.favorites-toggle:hover {
  border-color: var(--border-hover);
  background: var(--bg-secondary);
}

.favorites-count {
  background: var(--primary-color);
  color: white;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: 600;
  position: absolute;
  top: -6px;
  right: -6px;
  opacity: 0;
  transform: scale(0);
  transition: all var(--transition-fast);
}

.favorites-count.visible {
  opacity: 1;
  transform: scale(1);
}

/* ===== MAIN CONTENT ===== */
.main {
  flex: 1;
  padding: var(--space-8) 0;
}

/* ===== SEARCH SECTION ===== */
.search-section {
  margin-bottom: var(--space-12);
}

.search-container {
  margin-bottom: var(--space-6);
}

.search-form {
  position: relative;
  max-width: 600px;
  margin: 0 auto;
}

.search-input {
  width: 100%;
  padding: var(--space-4) var(--space-6) var(--space-4) var(--space-4);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-xl);
  font-size: var(--font-size-lg);
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgb(11 99 212 / 0.1);
}

.search-button {
  position: absolute;
  right: var(--space-2);
  top: 50%;
  transform: translateY(-50%);
  background: var(--primary-color);
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast);
}

.search-button:hover {
  background: var(--primary-hover);
}

.search-help {
  text-align: center;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  margin-top: var(--space-2);
}

/* Categories */
.categories {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.category-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-5);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.category-btn:hover {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.category-btn.active {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.category-btn.active::after {
  content: " (active)";
  font-size: var(--font-size-xs);
  opacity: 0.8;
}

.category-icon {
  font-size: var(--font-size-lg);
}

/* ===== ARTICLE SECTION ===== */
.article-section {
  position: relative;
}

/* Loading Skeleton */
.article-skeleton {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
  animation: pulse 2s ease-in-out infinite;
}

.skeleton-header {
  margin-bottom: var(--space-6);
}

.skeleton-title {
  height: 32px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
  width: 70%;
}

.skeleton-meta {
  height: 16px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  width: 40%;
}

.skeleton-content {
  display: flex;
  gap: var(--space-6);
  align-items: flex-start;
}

.skeleton-image {
  width: 200px;
  height: 150px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  flex-shrink: 0;
}

.skeleton-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  flex: 1;
  min-width: 0;
}

.skeleton-line {
  height: 16px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
}

.skeleton-line.short {
  width: 60%;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Article Card */
.article-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  opacity: 0;
  transform: translateY(20px);
}

.article-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.article-header {
  margin-bottom: var(--space-6);
}

.article-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  line-height: 1.2;
}

.article-meta {
  display: flex;
  gap: var(--space-4);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.article-content {
  display: flex;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
  align-items: flex-start;
}

.article-image-container {
  position: relative;
  flex-shrink: 0;
  width: 250px;
}

.article-image-container:empty {
  display: none;
}

.article-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal);
}

.article-image:hover {
  transform: scale(1.02);
}

.article-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  flex: 1;
  min-width: 0;
}

.article-summary {
  font-size: var(--font-size-lg);
  line-height: 1.7;
  color: var(--text-primary);
}

.article-actions {
  margin-top: var(--space-4);
}

.read-more-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.read-more-link:hover {
  color: var(--primary-hover);
  gap: var(--space-3);
}

/* Article Controls */
.article-controls {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-color);
}

.control-btn {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-5);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  position: relative;
}

.control-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.next-btn {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.next-btn:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

.favorite-btn .heart-filled {
  display: none;
}

.favorite-btn.favorited .heart-outline {
  display: none;
}

.favorite-btn.favorited .heart-filled {
  display: block;
  color: #ef4444;
}

.favorite-btn.favorited {
  background: #fef2f2;
  border-color: #fecaca;
  color: #ef4444;
}

[data-theme="dark"] .favorite-btn.favorited {
  background: #450a0a;
  border-color: #7f1d1d;
}

/* Error State */
.error-state {
  text-align: center;
  padding: var(--space-12);
  display: none;
}

.error-state.visible {
  display: block;
}

.error-illustration {
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}

.error-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.error-message {
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
}

.retry-btn {
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.retry-btn:hover {
  background: var(--primary-hover);
}

/* Status Messages */
.status-message {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  box-shadow: var(--shadow-lg);
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-normal);
  z-index: 1000;
  max-width: 300px;
}

.status-message.visible {
  transform: translateY(0);
  opacity: 1;
}

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  overflow: hidden;
  transform: scale(0.9);
  transition: transform var(--transition-normal);
}

.modal-overlay.visible .modal {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-6);
  border-bottom: 1px solid var(--border-color);
}

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.modal-content {
  padding: var(--space-6);
  max-height: 60vh;
  overflow-y: auto;
}

/* Favorites List */
.favorites-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.empty-favorites {
  text-align: center;
  padding: var(--space-12);
  color: var(--text-secondary);
}

.empty-favorites svg {
  margin-bottom: var(--space-4);
}

.favorite-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-4);
  transition: all var(--transition-fast);
}

.favorite-item:hover {
  background: var(--bg-tertiary);
}

.favorite-content {
  flex: 1;
}

.favorite-title {
  font-weight: 600;
  margin-bottom: var(--space-1);
  color: var(--text-primary);
}

.favorite-summary {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

.favorite-actions {
  display: flex;
  gap: var(--space-2);
}

.favorite-action {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.favorite-action:hover {
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--space-6) 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.attribution {
  margin-bottom: var(--space-2);
}

.attribution a {
  color: var(--primary-color);
  text-decoration: none;
}

.attribution a:hover {
  text-decoration: underline;
}

.footer-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}

.auto-fetch-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-xs);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.auto-fetch-toggle:hover {
  background: var(--bg-primary);
  color: var(--text-primary);
}

.auto-fetch-toggle[aria-pressed="true"] {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-3);
  }
  
  .header-content {
    flex-direction: row;
    justify-content: flex-start;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) 0;
  }
  
  .header-controls {
    right: var(--space-3);
  }
  
  .header {
    height: auto;
    position: relative;
  }
  
  .logo-wrapper {
    gap: var(--space-4);
  }
  
  .logo-title {
    font-size: var(--font-size-3xl);
  }
  
  .logo-icon-container {
    width: 52px;
    height: 52px;
  }
  
  .logo-icon {
    width: 36px;
    height: 36px;
  }
  
  .logo-glow {
    width: 48px;
    height: 48px;
  }
  
  .tagline {
    font-size: var(--font-size-sm);
  }
  
  .header-content {
    padding: var(--space-4) 0;
  }
  
  .logo-section {
    flex: 1;
    min-width: 0;
  }
  
  
  .categories {
    gap: var(--space-2);
  }
  
  .category-btn {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
  }
  
  .article-content {
    flex-direction: column;
    gap: var(--space-4);
  }
  
  .article-image-container {
    width: 100%;
    max-width: 400px;
    align-self: center;
    order: -1;
  }
  
  .article-title {
    font-size: var(--font-size-2xl);
  }
  
  .article-controls {
    flex-direction: column;
    gap: var(--space-3);
  }
  
  .control-btn {
    justify-content: center;
  }
  
  .skeleton-content {
    flex-direction: column;
  }
  
  .skeleton-image {
    width: 100%;
    height: 200px;
    max-width: 400px;
    align-self: center;
  }
  
  .modal {
    width: 95%;
    margin: var(--space-4);
  }
  
  .footer-note {
    flex-direction: column;
    gap: var(--space-1);
  }
}

@media (max-width: 480px) {
  .search-input {
    font-size: var(--font-size-base);
    padding: var(--space-3) var(--space-5) var(--space-3) var(--space-3);
  }
  
  .article-card {
    padding: var(--space-4);
  }
  
  .article-title {
    font-size: var(--font-size-xl);
  }
  
  .categories {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
  }
  
  .category-btn {
    justify-content: center;
  }
}

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

@keyframes slideIn {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(0);
  }
}

@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);
  }
}

.animate-fade-in {
  animation: fadeIn var(--transition-normal) ease-out;
}

.animate-bounce {
  animation: bounce 1s ease-in-out;
}

/* ===== UTILITY CLASSES ===== */
.hidden {
  display: none !important;
}

.loading {
  pointer-events: none;
  opacity: 0.6;
}

.text-center {
  text-align: center;
}

.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;
}

/* ===== PRINT STYLES ===== */
@media print {
  .header-controls,
  .categories,
  .article-controls,
  .status-message,
  .modal-overlay,
  .footer {
    display: none !important;
  }
  
  .article-card {
    box-shadow: none;
    border: 1px solid #000;
  }
}