/* ── Tag subgroups ──────────────────────────────────────────────── */
.tag-subgroup {
  margin-bottom: 0.25rem;
}

.tag-subgroup-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-gray-500);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}

/* ── Tag chip with count ────────────────────────────────────────── */
.tag-chip {
  position: relative;
}

.tag-chip .tag-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.1rem;
  height: 1.1rem;
  padding: 0 0.25rem;
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--color-gray-500);
  background: var(--color-gray-100);
  border-radius: var(--radius-pill);
  margin-left: 0.2rem;
  line-height: 1;
}

.tag-chip.active .tag-count {
  color: var(--color-primary-text);
  background: rgba(255, 255, 255, 0.3);
}

.tag-chip:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.tag-chip:disabled:hover {
  background: var(--color-surface);
  border-color: var(--color-gray-300);
  color: var(--color-gray-700);
}

/* ── Active filters bar ──────────────────────────────────────────── */
.active-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  min-height: 2rem;
}

.active-filters .label {
  font-size: 0.8rem;
  color: var(--color-gray-500);
  margin-right: 0.25rem;
}

.active-filter-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.5rem 0.25rem 0.625rem;
  font-size: 0.8rem;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-primary);
}

.active-filter-pill button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.1rem;
  height: 1.1rem;
  border: none;
  background: none;
  color: inherit;
  font-size: 0.9rem;
  line-height: 1;
  cursor: pointer;
  border-radius: 50%;
  padding: 0;
}

.active-filter-pill button:hover {
  background: var(--color-primary);
  color: #fff;
}

.clear-filters-btn {
  font-size: 0.8rem;
  font-family: var(--font-family);
  color: var(--color-gray-500);
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
  padding: 0.25rem 0.375rem;
}

.clear-filters-btn:hover {
  color: var(--color-primary-dark);
}

/* ── Results summary ─────────────────────────────────────────────── */
.results-summary {
  font-size: 0.85rem;
  color: var(--color-gray-500);
  margin-bottom: 1rem;
}

/* ── Card grid ───────────────────────────────────────────────────── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--card-min-width), 1fr));
  gap: 1rem;
  contain: layout paint;
  content-visibility: auto;
  contain-intrinsic-size: auto 500px;
}

.db-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.db-card:hover {
  box-shadow: var(--shadow-card-hover);
}

.db-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

.db-card-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}

.db-card-name a {
  color: inherit;
  text-decoration: none;
}

.db-card-name a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.db-card-description {
  font-size: 0.85rem;
  color: var(--color-gray-600);
  line-height: 1.5;
  flex: 1;
}

.db-card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  color: var(--color-gray-500);
  margin-top: auto;
  padding-top: 0.5rem;
  border-top: 1px solid var(--color-gray-100);
}

.db-card-meta .meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
}

.db-card-meta .stars {
  font-weight: 600;
  color: var(--color-gray-700);
}

.db-card-examples {
  display: inline-block;
  margin-top: 0.6rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: none;
}

.db-card-examples:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* ── Category badges ─────────────────────────────────────────────── */
.cat-badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--radius-pill);
  color: #fff;
  white-space: nowrap;
  flex-shrink: 0;
  line-height: 1.4;
}

.cat-relational  { background: var(--cat-relational); }
.cat-key-value   { background: var(--cat-key-value); }
.cat-document    { background: var(--cat-document); }
.cat-vector      { background: var(--cat-vector); }
.cat-graph       { background: var(--cat-graph); }
.cat-olap        { background: var(--cat-olap); }
.cat-time-series { background: var(--cat-time-series); }
.cat-search      { background: var(--cat-search); }
.cat-multi-model { background: var(--cat-multi-model); }
.cat-mobile      { background: var(--cat-mobile); }

/* ── Language tags ───────────────────────────────────────────────── */
.lang-tag {
  display: inline-block;
  padding: 0.1rem 0.4rem;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  background: var(--color-gray-100);
  color: var(--color-gray-700);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-gray-200);
}

/* ── States ──────────────────────────────────────────────────────── */
/* Loading */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 1rem;
  color: var(--color-gray-500);
  gap: 1rem;
}

.spinner {
  width: 2.5rem;
  height: 2.5rem;
  border: 3px solid var(--color-gray-200);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 1rem;
  text-align: center;
  color: var(--color-gray-500);
  gap: 0.75rem;
}

.empty-state h2 {
  font-size: 1.25rem;
  color: var(--color-gray-700);
}

.empty-state p {
  max-width: 400px;
  font-size: 0.9rem;
}

.empty-state .btn {
  margin-top: 0.5rem;
  padding: 0.5rem 1.25rem;
  font-size: 0.9rem;
  font-family: var(--font-family);
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.empty-state .btn:hover {
  background: var(--color-primary-dark);
}

/* Error state */
.error-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 1rem;
  text-align: center;
  color: var(--color-gray-500);
  gap: 0.75rem;
}

.error-state h2 {
  font-size: 1.25rem;
  color: #dc2626;
}

.error-state p {
  max-width: 480px;
  font-size: 0.9rem;
}

.error-state .btn {
  margin-top: 0.5rem;
  padding: 0.5rem 1.25rem;
  font-size: 0.9rem;
  font-family: var(--font-family);
  background: var(--color-gray-700);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
}

.error-state .btn:hover {
  background: var(--color-gray-800);
}

/* ── Offline banner ────────────────────────────────────────────────── */
.offline-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  margin-bottom: 1.25rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: #92400e;
  background: #fffbeb;
  border: 1px solid #fcd34d;
  border-radius: var(--radius-md);
}

.offline-banner-icon {
  font-size: 1.05rem;
  line-height: 1;
}

/* ── App nav ─────────────────────────────────────────────────────── */
.app-nav {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  font-family: var(--font-family);
  font-weight: 500;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-gray-700);
  cursor: pointer;
  transition: background var(--transition-fast),
              border-color var(--transition-fast),
              color var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.nav-btn:hover {
  background: var(--color-gray-100);
  border-color: var(--color-gray-400);
}

.nav-btn.active-view {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-text);
}

.nav-btn .nav-icon {
  font-size: 1rem;
  line-height: 1;
}

/* Share button */
.share-btn {
  margin-left: 0.5rem;
}

.share-btn:hover {
  background: var(--color-gray-100);
  border-color: var(--color-primary);
  color: var(--color-primary);
}