/* ================================
   EXPLORE — unified search + tag filter
   + homepage topic-graph (mindmap) container
================================ */

/* hide helpers (scoped to avoid global side-effects) */
.project-card.is-hidden,
.research-row.is-hidden,
.research-pagination.is-hidden,
.explore__empty.is-hidden {
  display: none !important;
}

.explore {
  padding: var(--space-10) 0 var(--space-4);
}

.explore__bar {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.explore__search {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  flex: 1 1 320px;
  min-width: 240px;
  background: rgba(250, 248, 245, 0.06);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-5);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

[data-theme="dark"] .explore__search {
  background: rgba(22, 21, 19, 0.45);
}

.explore__search:focus-within {
  border-color: var(--accent-warm);
  box-shadow: 0 0 0 3px var(--accent-warm-light);
}

.explore__search svg {
  width: 18px;
  height: 18px;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.explore__search input {
  flex: 1;
  min-width: 0;
  border: none;
  background: transparent;
  outline: none;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--text-primary);
  padding: var(--space-1) 0;
}

.explore__search input::placeholder {
  color: var(--text-tertiary);
}

.explore__clear {
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: var(--text-xl);
  line-height: 1;
  padding: 0 var(--space-1);
  border-radius: var(--radius-full);
  transition: color var(--transition-fast);
}

.explore__clear:hover {
  color: var(--accent-warm);
}

.explore__count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  white-space: nowrap;
  letter-spacing: 0.04em;
}

.explore__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.explore__chip {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-primary);
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  letter-spacing: 0.02em;
}

.explore__chip:hover {
  border-color: var(--accent-warm);
  color: var(--accent-warm);
  transform: translateY(-1px);
}

.explore__chip.is-active {
  background: var(--accent-warm);
  border-color: var(--accent-warm);
  color: #fff;
}

.explore__empty {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  margin-top: var(--space-4);
  font-style: italic;
}

.map__cta {
  margin-top: var(--space-8);
  text-align: center;
}

/* ── Homepage topic graph (reuses mindmap.js) ── */
.mindmap-container--home {
  width: 100%;
  max-width: 880px;
  margin: var(--space-6) auto 0;
  border-radius: var(--radius-xl);
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  overflow: hidden;
  padding: var(--space-4);
}

#mindmap-svg-container svg {
  width: 100%;
  height: auto;
  display: block;
}

@keyframes mindmap-in {
  from { opacity: 0; transform: scale(0.75); }
  to   { opacity: 1; transform: scale(1);    }
}

.mindmap-node {
  animation: mindmap-in 0.35s ease-out both;
  transform-box: fill-box;
  transform-origin: center;
}

@keyframes mindmap-line-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.mindmap-line {
  animation: mindmap-line-in 0.25s ease-out both;
}

@media (max-width: 639px) {
  .explore__search {
    flex: 1 1 100%;
  }
}