/* ===== Note Page Styles ===== */

/* Page Header */
.page-header {
  padding: var(--spacing-32) 0 var(--spacing-20);
  text-align: center;
  background: var(--color-background-secondary);
}

.page-title {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: var(--font-weight-black);
  line-height: 0.9;
  margin-bottom: var(--spacing-6);
  text-transform: uppercase;
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Filter Section */
.filter-section {
  padding: var(--spacing-8) 0;
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 80px;
  z-index: var(--z-sticky);
}

.filter-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-8);
}

.filter-tabs {
  display: flex;
  gap: var(--spacing-2);
  flex-wrap: wrap;
}

.filter-button {
  padding: var(--spacing-3) var(--spacing-5);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-normal);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  position: relative;
  overflow: hidden;
}

.filter-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  transition: left var(--transition-normal);
  z-index: -1;
}

.filter-button:hover::before,
.filter-button.active::before {
  left: 0;
}

.filter-button:hover,
.filter-button.active {
  border-color: var(--color-primary);
  color: var(--color-background);
  transform: translateY(-2px);
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--color-background-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2);
  gap: var(--spacing-2);
  min-width: 300px;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  padding: var(--spacing-2) var(--spacing-3);
  outline: none;
}

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

.search-button {
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: var(--spacing-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.search-button svg {
  width: 18px;
  height: 18px;
}

/* Articles Section */
.articles-section {
  padding: var(--spacing-20) 0;
}

/* Loading State */
.loading-state {
  margin-bottom: var(--spacing-12);
}

.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-8);
}

.skeleton-card {
  background: var(--color-background-secondary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.skeleton-image {
  width: 100%;
  height: 200px;
  background: var(--color-background-tertiary);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.skeleton-content {
  padding: var(--spacing-6);
}

.skeleton-title {
  width: 70%;
  height: 24px;
  background: var(--color-background-tertiary);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-4);
}

.skeleton-text {
  width: 100%;
  height: 16px;
  background: var(--color-background-tertiary);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-3);
}

.skeleton-text:last-child {
  width: 60%;
}

.skeleton-meta {
  width: 40%;
  height: 14px;
  background: var(--color-background-tertiary);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-4);
}

/* Articles Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-16);
}

.article-card {
  background: var(--color-background-secondary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
  cursor: pointer;
}

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

.article-image {
  position: relative;
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: var(--color-background-tertiary);
}

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

.article-card:hover .article-image img {
  transform: scale(1.05);
}

.article-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  background: var(--color-background-tertiary);
}

.article-placeholder svg {
  width: 60px;
  height: 60px;
}

.article-content {
  padding: var(--spacing-6);
}

.article-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-4);
}

.article-category {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  background: var(--color-background);
  padding: var(--spacing-1) var(--spacing-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.article-date {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.article-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-3);
  color: var(--color-text-primary);
  line-height: 1.3;
}

.article-excerpt {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-4);
}

.article-stats {
  display: flex;
  gap: var(--spacing-4);
  flex-wrap: wrap;
}

.article-stat {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  background: var(--color-background);
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

/* No Results */
.no-results {
  text-align: center;
  padding: var(--spacing-16) 0;
}

.no-results-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-6);
  color: var(--color-text-muted);
}

.no-results-icon svg {
  width: 100%;
  height: 100%;
}

.no-results-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-4);
}

.no-results-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 400px;
  margin: 0 auto;
}

/* Load More */
.load-more-container {
  text-align: center;
  padding: var(--spacing-8) 0;
}

.load-more-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-4) var(--spacing-8);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  background: transparent;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  cursor: pointer;
  overflow: hidden;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.load-more-button .button-bg {
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--color-primary);
  transition: left var(--transition-normal);
  z-index: -1;
}

.load-more-button:hover .button-bg {
  left: 0;
}

.load-more-button:hover {
  color: var(--color-background);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.load-more-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.load-more-button:disabled:hover {
  transform: none;
  box-shadow: none;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .filter-content {
    flex-direction: column;
    gap: var(--spacing-6);
  }
  
  .search-box {
    min-width: 100%;
    max-width: 400px;
  }
}

@media (max-width: 768px) {
  .page-header {
    padding: var(--spacing-20) 0 var(--spacing-12);
  }
  
  .page-title {
    font-size: clamp(2rem, 6vw, 4rem);
  }
  
  .filter-section {
    padding: var(--spacing-6) 0;
  }
  
  .filter-tabs {
    justify-content: center;
  }
  
  .filter-button {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-xs);
  }
  
  .articles-section {
    padding: var(--spacing-12) 0;
  }
  
  .skeleton-grid,
  .articles-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-6);
  }
}

@media (max-width: 480px) {
  .article-content {
    padding: var(--spacing-4);
  }
  
  .article-title {
    font-size: var(--font-size-lg);
  }
  
  .article-excerpt {
    font-size: var(--font-size-sm);
  }
  
  .no-results {
    padding: var(--spacing-12) 0;
  }
  
  .no-results-icon {
    width: 60px;
    height: 60px;
  }
  
  .no-results-title {
    font-size: var(--font-size-xl);
  }
}