/* Material Design 3 - Topics List Page */

/* Topics Archive Section */
#topics-archive {
  min-height: calc(100vh - var(--header-height));
  padding: 80px 0;
  background-color: var(--md-sys-color-surface);
}

.topics-archive-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Topics Header */
.topics-header {
  text-align: center;
  margin-bottom: 48px;
}

.topics-title {
  font-size: var(--md-sys-typescale-display-large-font-size);
  font-weight: var(--md-sys-typescale-display-large-font-weight);
  line-height: var(--md-sys-typescale-display-large-line-height);
  color: var(--md-sys-color-on-surface);
  margin: 0 0 16px 0;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp var(--md-sys-motion-duration-long3) var(--md-sys-motion-easing-emphasized-decelerate) forwards;
}

.topics-subtitle {
  font-size: var(--md-sys-typescale-body-large-font-size);
  color: var(--md-sys-color-on-surface-variant);
  margin: 0;
  opacity: 0;
  transform: translateY(10px);
  animation: fadeInUp var(--md-sys-motion-duration-long3) var(--md-sys-motion-easing-emphasized-decelerate) 0.1s forwards;
}

/* M3 Filter Section */
.topics-filter {
  background-color: var(--md-sys-color-surface-container-low);
  border-radius: var(--md-sys-shape-corner-large);
  padding: 32px;
  margin-bottom: 48px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp var(--md-sys-motion-duration-long3) var(--md-sys-motion-easing-emphasized-decelerate) 0.2s forwards;
}

.filter-title {
  font-size: var(--md-sys-typescale-title-medium-font-size);
  font-weight: var(--md-sys-typescale-title-medium-font-weight);
  color: var(--md-sys-color-on-surface);
  margin: 0 0 20px 0;
}

/* M3 Filter Chips */
.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.filter-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background-color: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface-variant);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-small);
  text-decoration: none;
  font-size: var(--md-sys-typescale-label-large-font-size);
  font-weight: var(--md-sys-typescale-label-large-font-weight);
  transition: all var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
  position: relative;
  overflow: hidden;
}

.filter-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: currentColor;
  opacity: 0;
  transition: opacity var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}

.filter-button:hover::before {
  opacity: var(--md-sys-state-hover-opacity);
}

.filter-button.active {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
  border-color: transparent;
}

.filter-button .count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 6px;
  background-color: var(--md-sys-color-surface-variant);
  color: var(--md-sys-color-on-surface-variant);
  border-radius: var(--md-sys-shape-corner-full);
  font-size: var(--md-sys-typescale-label-small-font-size);
  font-weight: var(--md-sys-typescale-label-small-font-weight);
}

.filter-button.active .count {
  background-color: var(--md-sys-color-on-secondary-container);
  color: var(--md-sys-color-secondary-container);
}

/* Topics Grid */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
  margin-bottom: 64px;
}

/* M3 Topic Card */
.topic-card {
  background-color: var(--md-sys-color-surface-container);
  border-radius: var(--md-sys-shape-corner-medium);
  padding: 24px;
  text-decoration: none;
  color: inherit;
  transition: all var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-emphasized-decelerate) forwards;
  animation-delay: calc(var(--index, 0) * 0.05s + 0.3s);
}

.topic-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, 
    transparent 0%, 
    var(--md-sys-color-primary) 100%);
  opacity: 0;
  transition: opacity var(--md-sys-motion-duration-medium1) var(--md-sys-motion-easing-standard);
  pointer-events: none;
}

.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: 
    0px 2px 3px 0px rgba(0, 0, 0, 0.30),
    0px 6px 10px 4px rgba(0, 0, 0, 0.15);
}

.topic-card:hover::before {
  opacity: 0.05;
}

/* Topic Meta Information */
.topic-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.topic-date {
  font-size: var(--md-sys-typescale-label-medium-font-size);
  color: var(--md-sys-color-on-surface-variant);
}

.topic-category {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--md-sys-shape-corner-small);
  font-size: var(--md-sys-typescale-label-small-font-size);
  font-weight: var(--md-sys-typescale-label-small-font-weight);
}

.category-news {
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

.category-press {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
}

.category-ir {
  background-color: var(--md-sys-color-tertiary-container);
  color: var(--md-sys-color-on-tertiary-container);
}

.category-blog {
  background-color: var(--md-sys-color-surface-variant);
  color: var(--md-sys-color-on-surface-variant);
}

/* Topic Title */
.topic-title {
  font-size: var(--md-sys-typescale-title-large-font-size);
  font-weight: var(--md-sys-typescale-title-large-font-weight);
  line-height: var(--md-sys-typescale-title-large-line-height);
  color: var(--md-sys-color-on-surface);
  margin: 0;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.external-link-icon {
  flex-shrink: 0;
  margin-top: 4px;
  color: var(--md-sys-color-on-surface-variant);
}

/* Topic Excerpt */
.topic-excerpt {
  font-size: var(--md-sys-typescale-body-medium-font-size);
  line-height: var(--md-sys-typescale-body-medium-line-height);
  color: var(--md-sys-color-on-surface-variant);
  margin: 0;
}

/* No Topics Message */
.no-topics {
  text-align: center;
  padding: 80px 24px;
  background-color: var(--md-sys-color-surface-container-low);
  border-radius: var(--md-sys-shape-corner-large);
  margin-top: 32px;
}

.no-topics p {
  font-size: var(--md-sys-typescale-body-large-font-size);
  color: var(--md-sys-color-on-surface-variant);
  margin: 0 0 24px 0;
}

.reset-filter {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  border-radius: var(--md-sys-shape-corner-full);
  text-decoration: none;
  font-size: var(--md-sys-typescale-label-large-font-size);
  font-weight: var(--md-sys-typescale-label-large-font-weight);
  transition: all var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}

.reset-filter:hover {
  box-shadow: 
    0px 2px 3px 0px rgba(0, 0, 0, 0.30),
    0px 6px 10px 4px rgba(0, 0, 0, 0.15);
  transform: translateY(-2px);
}

/* M3 Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 64px;
}

.pagination-item {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  background-color: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
  border-radius: var(--md-sys-shape-corner-full);
  text-decoration: none;
  font-size: var(--md-sys-typescale-label-large-font-size);
  font-weight: var(--md-sys-typescale-label-large-font-weight);
  transition: all var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
  position: relative;
  overflow: hidden;
}

.pagination-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: currentColor;
  opacity: 0;
  transition: opacity var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}

.pagination-item:hover::before {
  opacity: var(--md-sys-state-hover-opacity);
}

.pagination-item.active {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}

.pagination-item.disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

.pagination-ellipsis {
  color: var(--md-sys-color-on-surface-variant);
  padding: 0 8px;
}

/* Animations */
@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive Design */
@media (max-width: 839px) {
  .topics-grid {
    grid-template-columns: 1fr;
  }
  
  .topics-filter {
    padding: 24px;
  }
  
  .filter-buttons {
    justify-content: center;
  }
}

@media (max-width: 599px) {
  #topics-archive {
    padding: 48px 0;
  }
  
  .topics-title {
    font-size: var(--md-sys-typescale-display-medium-font-size);
  }
  
  .topics-archive-container {
    padding: 0 16px;
  }
  
  .filter-button {
    font-size: var(--md-sys-typescale-label-medium-font-size);
    padding: 6px 12px;
  }
  
  .topic-card {
    padding: 20px;
  }
  
  .topic-title {
    font-size: var(--md-sys-typescale-title-medium-font-size);
  }
  
  .pagination-item {
    min-width: 36px;
    height: 36px;
    padding: 0 8px;
  }
}

/* Dark Theme */
[data-theme="dark"] .topics-filter {
  background-color: var(--md-sys-color-surface-container);
}

[data-theme="dark"] .filter-button {
  background-color: var(--md-sys-color-surface-container-highest);
  border-color: var(--md-sys-color-outline);
}

[data-theme="dark"] .filter-button .count {
  background-color: var(--md-sys-color-surface-container);
}

[data-theme="dark"] .topic-card {
  background-color: var(--md-sys-color-surface-container-high);
}

[data-theme="dark"] .no-topics {
  background-color: var(--md-sys-color-surface-container);
}

[data-theme="dark"] .pagination-item {
  background-color: var(--md-sys-color-surface-container-highest);
}