/* CoreV2 knowledgebase — references/software language, no box-shadow */
:root {
  --kb-primary: var(--cv2-primary, var(--CoreV2-primary, var(--color-primary, #3b82f6)));
  --kb-primary-rgb: var(--cv2-primary-rgb, var(--CoreV2-primary-rgb, var(--color-primary-rgb, 59, 130, 246)));
  --kb-t: 0.22s ease;
  --kb-r: var(--cv2-radius-card, 22px);
  --kb-r-sm: var(--cv2-radius-input, 12px);
  --kb-bg: var(--bg-main, var(--cv2-surface-page, #f8fafc));
  --kb-bg-card: var(--bg-card, var(--cv2-surface-card, #ffffff));
  --kb-bg-muted: #f1f5f9;
  --kb-text: var(--text-primary, var(--CoreV2-text-primary, #0f172a));
  --kb-text-secondary: var(--text-secondary, #475569);
  --kb-text-muted: #94a3b8;
  --kb-border: rgba(var(--kb-primary-rgb), 0.12);
}

html.dark-mode,
[data-theme="dark"] {
  --kb-bg: var(--cv2-surface-page, #020617);
  --kb-bg-card: var(--cv2-surface-card, #0f172a);
  --kb-bg-muted: #1e293b;
  --kb-text: #f1f5f9;
  --kb-text-secondary: #94a3b8;
  --kb-text-muted: #64748b;
  --kb-border: rgba(var(--kb-primary-rgb), 0.2);
}

.kb-wrap,
.kb-wrap *,
.kb-wrap *::before,
.kb-wrap *::after {
  box-shadow: none !important;
}

.kb-wrap {
  max-width: var(--CoreV2-container-width);
  margin: 0 auto;
  padding: 0.5rem 1.5rem 4rem;
  width: 100%;
  color: var(--kb-text);
  box-sizing: border-box;
}

/* Search — references toolbar / search language */
.kb-search-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.4rem;
  padding: 1.05rem 1.25rem;
  background: linear-gradient(120deg, rgba(var(--kb-primary-rgb), 0.07) 0%, var(--kb-bg-card) 45%, rgba(var(--kb-primary-rgb), 0.05) 100%);
  border: 1px solid rgba(var(--kb-primary-rgb), 0.14);
  border-radius: var(--kb-r);
}

html.dark-mode .kb-search-bar,
[data-theme="dark"] .kb-search-bar {
  background: linear-gradient(120deg, rgba(var(--kb-primary-rgb), 0.12) 0%, var(--kb-bg-card) 50%, rgba(var(--kb-primary-rgb), 0.06) 100%);
  border-color: rgba(var(--kb-primary-rgb), 0.2);
}

.kb-search-bar form {
  flex: 1;
  position: relative;
  min-width: 220px;
}

.kb-search-bar .kb-search-icon {
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--kb-primary);
  font-size: 0.95rem;
  line-height: 1;
  pointer-events: none;
  z-index: 1;
}

.kb-search-bar .kb-search-input {
  width: 100%;
  box-sizing: border-box;
  padding: 0.72rem 1rem 0.72rem 2.45rem;
  border: 1px solid rgba(var(--kb-primary-rgb), 0.18);
  border-radius: var(--kb-r-sm);
  background: rgba(var(--kb-primary-rgb), 0.06);
  color: var(--kb-text);
  font-size: 0.88rem;
  outline: none;
  transition: border-color var(--kb-t), outline-color var(--kb-t), background var(--kb-t);
}

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

.kb-search-bar form:focus-within .kb-search-input {
  border-color: var(--kb-primary);
  outline: 2px solid rgba(var(--kb-primary-rgb), 0.28);
  outline-offset: 2px;
  background: var(--kb-bg-card);
}

html.dark-mode .kb-search-bar .kb-search-input,
[data-theme="dark"] .kb-search-bar .kb-search-input {
  background: rgba(var(--kb-primary-rgb), 0.1);
  border-color: rgba(var(--kb-primary-rgb), 0.22);
  color: #e2e8f0;
}

.kb-search-stats {
  display: flex;
  gap: 0.55rem;
  flex-shrink: 0;
  flex-wrap: wrap;
}

.kb-search-stat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--kb-text-secondary);
  white-space: nowrap;
  padding: 0.4rem 0.75rem;
  border-radius: var(--cv2-radius-chip, 999px);
  background: rgba(var(--kb-primary-rgb), 0.08);
  border: 1px solid rgba(var(--kb-primary-rgb), 0.14);
}

.kb-search-stat strong {
  color: var(--kb-primary);
  font-weight: 700;
}

.kb-search-stat .hki-stroke {
  color: var(--kb-primary);
  font-size: 0.88rem;
  line-height: 1;
}

/* Layout: content | sidebar right */
.kb-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 290px);
  gap: 1.5rem;
  align-items: flex-start;
}

.kb-sidebar {
  position: sticky;
  top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

/* Sidebar = ref-panel */
.kb-sidebar-card {
  background: linear-gradient(145deg, rgba(var(--kb-primary-rgb), 0.06) 0%, var(--kb-bg-card) 42%, rgba(var(--kb-primary-rgb), 0.04) 100%);
  border: 1px solid rgba(var(--kb-primary-rgb), 0.14);
  border-radius: var(--kb-r);
  padding: 1.15rem 1.05rem;
  overflow: hidden;
}

html.dark-mode .kb-sidebar-card,
[data-theme="dark"] .kb-sidebar-card {
  background: linear-gradient(145deg, rgba(var(--kb-primary-rgb), 0.12) 0%, var(--kb-bg-card) 50%, rgba(var(--kb-primary-rgb), 0.06) 100%);
  border-color: rgba(var(--kb-primary-rgb), 0.2);
}

.kb-sidebar-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--kb-text);
  margin: 0 0 0.85rem;
  padding: 0 0.15rem 0.75rem;
  border-bottom: 1px solid rgba(var(--kb-primary-rgb), 0.12);
  text-transform: none;
  letter-spacing: 0;
}

.kb-sidebar-header .hki-stroke {
  color: var(--kb-primary);
  font-size: 1.05rem;
  line-height: 1;
}

.kb-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.kb-nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.58rem 0.85rem;
  text-decoration: none;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--kb-text-secondary);
  border-radius: var(--cv2-radius-input, 11px);
  border: 1px solid transparent;
  transition: background var(--kb-t), color var(--kb-t), border-color var(--kb-t);
  position: relative;
}

.kb-nav-item:hover {
  background: rgba(var(--kb-primary-rgb), 0.1);
  color: var(--kb-primary);
}

.kb-nav-item.active {
  background: rgba(var(--kb-primary-rgb), 0.14);
  color: var(--kb-primary);
  border-color: rgba(var(--kb-primary-rgb), 0.22);
  font-weight: 600;
}

.kb-nav-item.active::before {
  display: none;
}

.kb-nav-item .nav-icon {
  flex-shrink: 0;
  font-size: 0.92rem;
  line-height: 1;
  opacity: 0.7;
  color: inherit;
}

.kb-nav-item:hover .nav-icon,
.kb-nav-item.active .nav-icon {
  opacity: 1;
  color: var(--kb-primary);
}

.kb-nav-label {
  flex: 1;
  min-width: 0;
  line-height: 1.35;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.kb-nav-count {
  flex-shrink: 0;
  min-width: 1.55rem;
  text-align: center;
  font-size: 0.68rem;
  font-weight: 600;
  line-height: 1.35;
  padding: 2px 8px;
  border-radius: var(--cv2-radius-chip, 999px);
  background: rgba(var(--kb-primary-rgb), 0.1);
  color: var(--kb-primary);
}

.kb-nav-item.active .kb-nav-count {
  background: var(--kb-primary);
  color: #fff;
}

html.dark-mode .kb-nav-item,
[data-theme="dark"] .kb-nav-item {
  color: #e2e8f0;
}

html.dark-mode .kb-nav-item:hover,
html.dark-mode .kb-nav-item.active,
[data-theme="dark"] .kb-nav-item:hover,
[data-theme="dark"] .kb-nav-item.active {
  background: rgba(var(--kb-primary-rgb), 0.18);
  color: var(--kb-primary);
}

/* Content header — plain row, no background panel */
.kb-content {
  min-width: 0;
}

.kb-content-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
  padding: 0;
  background: none;
  border: none;
  border-radius: 0;
}

html.dark-mode .kb-content-header,
[data-theme="dark"] .kb-content-header {
  background: none;
  border: none;
}

.kb-content-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--kb-text);
  line-height: 1.3;
  min-width: 0;
}

.kb-content-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.35rem 0.65rem;
  border-radius: var(--cv2-radius-chip, 999px);
  background: rgba(var(--kb-primary-rgb), 0.12);
  color: var(--kb-primary);
  border: 1px solid rgba(var(--kb-primary-rgb), 0.2);
  white-space: nowrap;
}

.kb-content-badge .hki-stroke {
  font-size: 0.85rem;
  line-height: 1;
}

/* Cards — tighter spacing, no hover overlap */
.kb-grid {
  display: grid !important;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
  width: 100%;
  align-items: stretch;
}

.kb-card {
  position: relative;
  z-index: 1;
  isolation: isolate;
  background: linear-gradient(130deg, rgba(var(--kb-primary-rgb), 0.04) -10%, var(--kb-bg-card) 50%, rgba(var(--kb-primary-rgb), 0.06) 110%);
  border: 1px solid rgba(var(--kb-primary-rgb), 0.1);
  border-radius: var(--cv2-radius-card, 18px);
  padding: 0.95rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  height: auto;
  min-height: 0;
  transition: transform 0.2s ease, border-color var(--kb-t);
}

.kb-card:hover {
  z-index: 2;
  transform: translateY(-3px);
  border-color: rgba(var(--kb-primary-rgb), 0.28);
}

html.dark-mode .kb-card,
[data-theme="dark"] .kb-card {
  background: #1e293b;
  border-color: rgba(var(--kb-primary-rgb), 0.15);
}

.kb-card-top {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0;
}

.kb-card-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  border-radius: 10px;
  background: rgba(var(--kb-primary-rgb), 0.1);
  border: 1px solid rgba(var(--kb-primary-rgb), 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--kb-t), border-color var(--kb-t);
}

.kb-card-icon .hki-stroke {
  font-size: 1rem;
  line-height: 1;
  color: var(--kb-primary);
  transition: color var(--kb-t);
}

.kb-card:hover .kb-card-icon {
  background: var(--kb-primary);
  border-color: transparent;
}

.kb-card:hover .kb-card-icon .hki-stroke {
  color: #fff;
}

.kb-card-title {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 650;
  color: var(--kb-text);
  line-height: 1.3;
  min-width: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--kb-t);
}

.kb-card:hover .kb-card-title {
  color: var(--kb-primary);
}

html.dark-mode .kb-card-title,
[data-theme="dark"] .kb-card-title {
  color: #f1f5f9;
}

.kb-card-excerpt {
  margin: 0;
  font-size: 0.8rem;
  color: var(--kb-text-secondary);
  line-height: 1.45;
  flex-grow: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

html.dark-mode .kb-card-excerpt,
[data-theme="dark"] .kb-card-excerpt {
  color: #94a3b8;
}

.kb-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.55rem;
  border-top: 1px solid rgba(var(--kb-primary-rgb), 0.1);
  margin-top: 0.15rem;
}

.kb-card-meta {
  display: flex;
  gap: 6px;
}

.kb-card-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--kb-text-muted);
  background: rgba(var(--kb-primary-rgb), 0.08);
  border: 1px solid rgba(var(--kb-primary-rgb), 0.1);
  padding: 4px 9px;
  border-radius: var(--cv2-radius-chip, 999px);
  transition: background var(--kb-t), color var(--kb-t), border-color var(--kb-t);
}

.kb-card-tag .hki-stroke {
  font-size: 0.78rem;
  line-height: 1;
}

.kb-card:hover .kb-card-tag {
  background: rgba(var(--kb-primary-rgb), 0.14);
  color: var(--kb-primary);
  border-color: rgba(var(--kb-primary-rgb), 0.2);
}

.kb-card-arrow {
  color: var(--kb-text-muted);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity var(--kb-t), transform var(--kb-t), color var(--kb-t);
  font-size: 1rem;
  line-height: 1;
}

.kb-card:hover .kb-card-arrow {
  opacity: 1;
  transform: translateX(0);
  color: var(--kb-primary);
}

.kb-empty {
  text-align: center;
  padding: 3.5rem 2rem;
  background: linear-gradient(130deg, rgba(var(--kb-primary-rgb), 0.04), var(--kb-bg-card) 50%, rgba(var(--kb-primary-rgb), 0.05));
  border: 1px dashed rgba(var(--kb-primary-rgb), 0.22);
  border-radius: var(--kb-r);
}

.kb-empty .hki-stroke {
  font-size: 2.2rem;
  opacity: 0.45;
  margin-bottom: 0.75rem;
  color: var(--kb-primary);
  line-height: 1;
}

.kb-empty h3 {
  margin: 0 0 0.4rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--kb-text);
}

.kb-empty p {
  margin: 0 auto;
  color: var(--kb-text-secondary);
  max-width: 340px;
  font-size: 0.86rem;
}

.kb-pagination {
  margin-top: 1.75rem;
  display: flex;
  justify-content: center;
}

.kb-pagination .pagination {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.kb-pagination .pagination a,
.kb-pagination .pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 8px;
  border-radius: var(--kb-r-sm);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--kb-text-secondary);
  background: var(--kb-bg-card);
  border: 1px solid rgba(var(--kb-primary-rgb), 0.14);
  text-decoration: none;
  transition: background var(--kb-t), color var(--kb-t), border-color var(--kb-t);
}

.kb-pagination .pagination a:hover {
  background: rgba(var(--kb-primary-rgb), 0.1);
  color: var(--kb-primary);
  border-color: rgba(var(--kb-primary-rgb), 0.28);
}

.kb-pagination .pagination .active span,
.kb-pagination .pagination .current {
  background: var(--kb-primary);
  color: #fff;
  border-color: var(--kb-primary);
}

.kb-card,
.kb-sidebar-card,
.kb-search-bar {
  opacity: 1 !important;
  animation: none !important;
}

@media (max-width: 1100px) {
  .kb-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 1024px) {
  .kb-layout {
    grid-template-columns: 1fr;
  }

  .kb-sidebar {
    position: static;
    order: -1;
  }

  .kb-nav-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.4rem;
  }

  .kb-nav-item {
    padding: 0.45rem 0.8rem;
    border: 1px solid rgba(var(--kb-primary-rgb), 0.14);
  }

  .kb-nav-item .nav-icon {
    display: none;
  }

  .kb-search-stats {
    width: 100%;
  }
}

@media (max-width: 768px) {
  .kb-wrap {
    padding: 0.25rem 1rem 3rem;
  }

  .kb-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .kb-search-bar {
    padding: 0.9rem 1rem;
  }

  .kb-content-title {
    font-size: 0.98rem;
  }
}