/**
 * ARTIGOS PAGE - CSS ESPECÍFICO
 * Estilos para a página de listagem de artigos
 */

/* ================================================
   PAGE HEADER
   ================================================ */
.page-header {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  padding: var(--space-4xl) 0;
  position: relative;
  overflow: hidden;
  color: white;
  text-align: center;
}

.page-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='0.1'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.3;
}

.page-header-content {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.page-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  margin: 0 0 var(--space-lg) 0;
  line-height: 1.2;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.page-subtitle {
  font-size: var(--font-size-lg);
  margin: 0 0 var(--space-3xl) 0;
  opacity: 0.9;
  line-height: 1.5;
}


/* ================================================
   SEARCH CONTAINER
   ================================================ */
.search-container {
  max-width: 500px;
  margin: 0 auto;
}

.search-input-wrapper {
  position: relative;
  margin-bottom: var(--space-md);
}

.search-input {
  width: 100%;
  padding: var(--space-lg) var(--space-xl);
  padding-right: 50px;
  border: none;
  border-radius: var(--radius-xl);
  font-size: var(--font-size-lg);
  background: rgba(255, 255, 255, 0.95);
  color: var(--text-primary);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3), var(--shadow-xl);
  transform: scale(1.02);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.clear-search {
  position: absolute;
  right: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  font-size: var(--font-size-lg);
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--space-sm);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.clear-search:hover {
  background: var(--border-light);
  color: var(--text-primary);
}

.search-results-count {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
  font-weight: 500;
}

/* ================================================
   FILTER SECTION
   ================================================ */
.filter-section {
  background: var(--bg-secondary);
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--border-light);
}

.filter-tabs {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.filter-tab {
  background: transparent;
  border: 2px solid var(--border-light);
  color: var(--text-secondary);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-full);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.filter-tab:hover {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
  transform: translateY(-2px);
}

.filter-tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.filter-tab:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* ================================================
   ARTICLES GRID
   ================================================ */
.articles-section {
  padding: var(--space-4xl) 0;
}

.articles-grid {
  display: grid;
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
}

.article-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.article-card:focus-within {
  outline: none;
  box-shadow: 0 0 0 3px var(--primary-light), var(--shadow-xl);
}

.article-thumbnail {
  position: relative;
  height: 220px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary-light), var(--bg-secondary));
}

.article-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.article-card:hover .article-thumbnail img {
  transform: scale(1.1);
}

.thumbnail-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  font-size: 4rem;
  opacity: 0.6;
  color: var(--primary);
}

.article-category {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  background: var(--primary);
  color: white;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.article-content {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.article-date {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.article-date::before {
  content: '📅';
  font-size: var(--font-size-xs);
}

.reading-time {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.reading-time::before {
  content: '⏱️';
  font-size: var(--font-size-xs);
}

.article-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin: 0 0 var(--space-md) 0;
  line-height: 1.3;
  color: var(--text-primary);
}

.article-title a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.article-title a:hover,
.article-title a:focus {
  color: var(--primary);
  outline: none;
}

.article-excerpt {
  color: var(--text-secondary);
  margin: 0 0 var(--space-lg) 0;
  line-height: 1.6;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-tags {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.tag {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.tag:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.article-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-light);
}

.read-more-btn {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  transition: all var(--transition-fast);
}

.read-more-btn:hover {
  color: var(--primary-hover);
  transform: translateX(4px);
}

.read-more-btn::after {
  content: '→';
  font-size: var(--font-size-lg);
  transition: transform var(--transition-fast);
}

.read-more-btn:hover::after {
  transform: translateX(4px);
}

.article-author {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.author-avatar {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
}

/* ================================================
   LOADING AND EMPTY STATES
   ================================================ */
.articles-loading {
  text-align: center;
  padding: var(--space-4xl) 0;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-light);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--space-lg) auto;
}

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

.no-results {
  text-align: center;
  padding: var(--space-4xl) 0;
  color: var(--text-secondary);
}

.no-results-icon {
  font-size: 4rem;
  margin-bottom: var(--space-lg);
  opacity: 0.5;
}

.no-results h3 {
  font-size: var(--font-size-2xl);
  margin: 0 0 var(--space-md) 0;
  color: var(--text-primary);
}

.no-results p {
  margin: 0 0 var(--space-2xl) 0;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ================================================
   LOAD MORE BUTTON
   ================================================ */
.load-more-container {
  text-align: center;
  margin-top: var(--space-2xl);
}

.load-more-btn {
  padding: var(--space-lg) var(--space-2xl);
  font-size: var(--font-size-lg);
  position: relative;
  overflow: hidden;
}

.load-more-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.6s;
}

.load-more-btn:hover::before {
  left: 100%;
}

/* ================================================
   NEWSLETTER SECTION
   ================================================ */
.newsletter-section {
  background: var(--bg-secondary);
  padding: var(--space-4xl) 0;
  margin-top: var(--space-4xl);
}

.newsletter-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.newsletter-content h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin: 0 0 var(--space-md) 0;
  color: var(--text-primary);
}

.newsletter-content p {
  color: var(--text-secondary);
  margin: 0 0 var(--space-2xl) 0;
  font-size: var(--font-size-lg);
}

.newsletter-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  align-items: center;
}

.newsletter-input-group {
  display: flex;
  gap: var(--space-md);
  width: 100%;
  max-width: 400px;
  flex-wrap: wrap;
}

.newsletter-input {
  flex: 1;
  min-width: 200px;
  padding: var(--space-md) var(--space-lg);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  background: var(--surface);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.newsletter-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.newsletter-btn {
  padding: var(--space-md) var(--space-xl);
  white-space: nowrap;
  flex-shrink: 0;
}

.newsletter-disclaimer {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  text-align: center;
  margin: 0;
}

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

.newsletter-disclaimer a:hover {
  text-decoration: underline;
}

/* ================================================
   RESPONSIVE DESIGN
   ================================================ */
@media (max-width: 640px) {
  .page-title {
    font-size: var(--font-size-3xl);
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .filter-tabs {
    flex-direction: column;
    align-items: center;
  }
  
  .search-input {
    font-size: var(--font-size-base);
  }
  
  .newsletter-input-group {
    flex-direction: column;
    max-width: 100%;
  }
  
  .newsletter-input {
    min-width: auto;
  }
  
  .article-content {
    padding: var(--space-lg);
  }
  
  .article-footer {
    flex-direction: column;
    gap: var(--space-md);
    align-items: flex-start;
  }
}

@media (min-width: 768px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1200px) {
  .articles-grid {
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  }
}

/* ================================================
   ACCESSIBILITY IMPROVEMENTS
   ================================================ */
@media (prefers-reduced-motion: reduce) {
  .article-card {
    transition: box-shadow var(--transition-fast);
  }
  
  .article-card:hover {
    transform: none;
  }
  
  .loading-spinner {
    animation: none;
  }
  
  .load-more-btn::before {
    display: none;
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  .filter-tab {
    border-width: 3px;
  }
  
  .article-card {
    border-width: 2px;
  }
  
  .newsletter-input {
    border-width: 3px;
  }
}

/* ================================================
   PRINT STYLES
   ================================================ */
@media print {
  .page-header,
  .filter-section,
  .newsletter-section,
  .load-more-container {
    display: none;
  }
  
  .article-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
    margin-bottom: 1rem;
  }
  
  .article-thumbnail {
    height: 150px;
  }
}

/* ================================================
   DARK MODE SPECIFIC ADJUSTMENTS
   ================================================ */
[data-theme="dark"] .page-header {
  background: linear-gradient(135deg, #1e3a8a, #92400e);
}

[data-theme="dark"] .article-thumbnail {
  background: linear-gradient(135deg, var(--surface-elevated), var(--surface));
}

[data-theme="dark"] .thumbnail-placeholder {
  filter: brightness(0.8);
}

[data-theme="dark"] .newsletter-input {
  background: var(--surface);
  border-color: var(--border-medium);
}