/* 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;
}

/* ========== 統合フィルターセクション ========== */
.topics-filter-unified {
  background-color: var(--md-sys-color-surface-container-low);
  border-radius: var(--md-sys-shape-corner-large);
  padding: 20px 24px;
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp var(--md-sys-motion-duration-long3) var(--md-sys-motion-easing-emphasized-decelerate) 0.2s forwards;
}

.filter-section {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.filter-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--md-sys-color-on-surface-variant);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.filter-label svg {
  opacity: 0.7;
}

.clear-tags-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  padding: 4px 10px;
  background-color: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border-radius: var(--md-sys-shape-corner-full);
  text-decoration: none;
  font-size: 0.7rem;
  font-weight: 500;
  transition: all var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}

.clear-tags-btn:hover {
  background-color: rgba(239, 68, 68, 0.2);
}

/* 検索フォーム */
.search-section {
  margin-bottom: 8px;
}

.search-form {
  width: 100%;
}

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

.search-icon {
  position: absolute;
  left: 16px;
  color: var(--md-sys-color-on-surface-variant);
  pointer-events: none;
}

.search-input {
  width: 100%;
  height: 48px;
  padding: 0 48px;
  background-color: var(--md-sys-color-surface-container-high);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-full);
  font-size: 0.9rem;
  color: var(--md-sys-color-on-surface);
  transition: all var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}

.search-input::placeholder {
  color: var(--md-sys-color-on-surface-variant);
}

.search-input:focus {
  outline: none;
  border-color: var(--md-sys-color-primary);
  background-color: var(--md-sys-color-surface);
  box-shadow: 0 0 0 2px rgba(var(--md-sys-color-primary-rgb), 0.2);
}

.search-clear {
  position: absolute;
  right: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: var(--md-sys-color-on-surface-variant);
  transition: all var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}

.search-clear:hover {
  background-color: var(--md-sys-color-surface-variant);
  color: var(--md-sys-color-on-surface);
}

/* フィルターチップ */
.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  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-full);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 500;
  transition: all var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
}

.filter-chip:hover {
  background-color: var(--md-sys-color-surface-container-highest);
  border-color: var(--md-sys-color-outline);
}

.filter-chip.active {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  border-color: transparent;
}

.filter-chip.active:hover {
  background-color: var(--md-sys-color-primary);
  opacity: 0.9;
}

.chip-text {
  white-space: nowrap;
}

.chip-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  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: 0.65rem;
  font-weight: 600;
}

.filter-chip.active .chip-count {
  background-color: rgba(255, 255, 255, 0.25);
  color: var(--md-sys-color-on-primary);
}

/* タグチップは少し小さく */
.tag-chip {
  font-size: 0.75rem;
  padding: 5px 10px;
}

.tag-chip .chip-count {
  min-width: 16px;
  height: 16px;
  font-size: 0.6rem;
}

/* 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);
}

.category-tech {
  background-color: #e8f5e9;
  color: #1b5e20;
}

[data-theme="dark"] .category-tech {
  background-color: rgba(76, 175, 80, 0.2);
  color: #81c784;
}

/* 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;
}

/* Topic Card Tags */
.topic-card-tags {
  display: flex;
  flex-wrap: nowrap;
  gap: 6px;
  margin-top: auto;
  padding-top: 12px;
  overflow: hidden;
}

.card-tag {
  display: inline-block;
  padding: 2px 8px;
  background-color: transparent;
  color: var(--md-sys-color-on-surface-variant);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-full);
  font-size: 0.65rem;
  font-weight: 400;
  white-space: nowrap;
  opacity: 0.8;
}

.card-tag-more {
  display: inline-block;
  padding: 2px 6px;
  color: var(--md-sys-color-on-surface-variant);
  font-size: 0.65rem;
  font-weight: 400;
  opacity: 0.6;
  white-space: nowrap;
}

/* 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-unified {
    padding: 16px 20px;
  }

  .filter-chips {
    justify-content: flex-start;
  }
}

@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;
  }

  /* モバイルフィルター */
  .topics-filter-unified {
    padding: 16px;
    gap: 14px;
    margin-bottom: 24px;
  }

  .filter-section {
    gap: 8px;
  }

  .filter-label {
    font-size: 0.7rem;
  }

  .filter-label svg {
    width: 14px;
    height: 14px;
  }

  /* カテゴリチップ: 3列グリッドレイアウト */
  .filter-section:first-child .filter-chips {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    width: 100%;
  }

  /* タグチップは従来のflex表示 */
  .tags-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }

  .filter-chip {
    font-size: 0.7rem;
    padding: 6px 10px;
    gap: 5px;
    min-height: 32px;
  }

  /* カテゴリチップのみ: 中央揃え・タップ領域確保 */
  .filter-section:first-child .filter-chip {
    justify-content: center;
    text-align: center;
    min-height: 40px;
    padding: 8px 12px;
  }

  .chip-count {
    min-width: 16px;
    height: 16px;
    font-size: 0.6rem;
    padding: 0 4px;
  }

  .tag-chip {
    font-size: 0.65rem;
    padding: 5px 8px;
  }

  .tag-chip .chip-count {
    min-width: 14px;
    height: 14px;
    font-size: 0.55rem;
  }

  .clear-tags-btn {
    font-size: 0.65rem;
    padding: 3px 8px;
  }

  .topic-card {
    padding: 20px;
  }

  .topic-title {
    font-size: var(--md-sys-typescale-title-medium-font-size);
  }

  .topic-card-tags {
    gap: 4px;
    padding-top: 8px;
  }

  .card-tag {
    padding: 1px 6px;
    font-size: 0.55rem;
  }

  .card-tag-more {
    font-size: 0.55rem;
    padding: 1px 4px;
  }

  .pagination-item {
    min-width: 36px;
    height: 36px;
    padding: 0 8px;
  }
}

/* Dark Theme */
[data-theme="dark"] .topics-filter-unified {
  background-color: #1c2128;
  border: 1px solid #30363d;
}

[data-theme="dark"] .filter-label {
  color: #8b949e;
}

[data-theme="dark"] .filter-chip {
  background-color: #21262d;
  color: #c9d1d9;
  border-color: #30363d;
}

[data-theme="dark"] .filter-chip:hover {
  background-color: #30363d;
  border-color: #484f58;
}

[data-theme="dark"] .filter-chip.active {
  background-color: #388bfd;
  color: #ffffff;
  border-color: transparent;
}

[data-theme="dark"] .chip-count {
  background-color: #30363d;
  color: #8b949e;
}

[data-theme="dark"] .filter-chip.active .chip-count {
  background-color: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

[data-theme="dark"] .clear-tags-btn {
  background-color: rgba(248, 81, 73, 0.15);
  color: #f85149;
}

[data-theme="dark"] .clear-tags-btn:hover {
  background-color: rgba(248, 81, 73, 0.25);
}

[data-theme="dark"] .search-input {
  background-color: #21262d;
  border-color: #30363d;
  color: #c9d1d9;
}

[data-theme="dark"] .search-input::placeholder {
  color: #8b949e;
}

[data-theme="dark"] .search-input:focus {
  background-color: #161b22;
  border-color: #388bfd;
  box-shadow: 0 0 0 2px rgba(56, 139, 253, 0.2);
}

[data-theme="dark"] .search-icon {
  color: #8b949e;
}

[data-theme="dark"] .search-clear {
  color: #8b949e;
}

[data-theme="dark"] .search-clear:hover {
  background-color: #30363d;
  color: #c9d1d9;
}

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

[data-theme="dark"] .card-tag {
  background-color: transparent;
  color: #8b949e;
  border-color: #3d4550;
}

[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);
}