/* === EXPLORER — Apple-inspired taxonomy tree (2026-07-17) === */

/* Toolbar */
.explorer-toolbar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 12px 22px; border-bottom: 1px solid var(--border-soft);
  background: var(--glass);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  position: sticky; top: 48px; z-index: 50;
}
.explorer-toolbar select, .explorer-toolbar input {
  background: var(--bg-alt); color: var(--text);
  border: 1px solid var(--border-soft);
  border-radius: 10px; padding: 8px 12px;
  font-size: 14px; font-family: var(--font);
  outline: none; transition: var(--transition);
}
.explorer-toolbar select:focus, .explorer-toolbar input:focus {
  border-color: var(--accent); background: var(--surface);
}
.explorer-toolbar input { min-width: 240px; }
.explorer-toolbar label {
  font-size: 12px; color: var(--text-muted); font-weight: 500;
  letter-spacing: 0.2px;
}
.explorer-stats {
  margin-left: auto; font-size: 12px; color: var(--text-muted);
}
.explorer-btn {
  background: var(--bg-alt); border: 1px solid transparent;
  color: var(--text); border-radius: 10px;
  padding: 7px 14px; font-size: 13px; cursor: pointer;
  font-family: var(--font); font-weight: 500;
  transition: var(--transition);
}
.explorer-btn:hover { background: var(--surface); border-color: var(--border-color); }

/* Viewport (pannable canvas) */
.tree-viewport {
  position: relative; overflow: hidden;
  min-height: calc(100vh - 100px); cursor: grab;
  background: var(--bg);
}
.tree-viewport::before {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(circle at 1px 1px, var(--border-soft) 1px, transparent 0);
  background-size: 32px 32px;
  opacity: 0.5; pointer-events: none;
}
.tree-viewport:active, .tree-viewport.dragging { cursor: grabbing; }

.tree-canvas {
  display: inline-flex; align-items: center; padding: 60px;
  min-width: max-content; min-height: max-content;
  transition: none; position: relative; z-index: 1;
}

/* Zoom controls */
.zoom-controls {
  position: fixed; bottom: 24px; right: 24px; z-index: 100;
  display: flex; flex-direction: column; gap: 4px;
  background: var(--glass);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  padding: 6px; border-radius: 14px;
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow);
}
.zoom-btn {
  width: 36px; height: 36px; border-radius: 10px;
  background: transparent; border: none;
  color: var(--text); font-size: 18px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font); transition: var(--transition);
}
.zoom-btn:hover { background: var(--bg-alt); }
.zoom-level {
  text-align: center; font-size: 11px; color: var(--text-muted);
  padding: 2px 0;
}

/* Horizontal tree */
.tree-root { display: flex; align-items: center; }
.tree-node { position: relative; display: flex; align-items: center; }
.tree-children {
  display: flex; flex-direction: column; gap: 6px;
  margin-left: 8px; padding-left: 26px; position: relative;
}
.tree-children.collapsed { display: none; }

.tree-child-wrapper { position: relative; display: flex; align-items: center; }
.tree-child-wrapper::before {
  content: ''; position: absolute; left: -26px; top: 0; bottom: 0;
  width: 1.5px; background: var(--border-color);
}
.tree-child-wrapper:first-child::before { top: 50%; }
.tree-child-wrapper:last-child::before  { bottom: 50%; }
.tree-child-wrapper:only-child::before  { display: none; }
.tree-child-wrapper::after {
  content: ''; position: absolute; left: -26px; top: 50%;
  width: 26px; height: 1.5px; background: var(--border-color);
  transform: translateY(-50%);
}

/* Node cards */
.node-card {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: 12px;
  border: 1px solid var(--border-soft); background: var(--surface);
  cursor: pointer; transition: var(--transition);
  white-space: nowrap; user-select: none; min-width: max-content;
  box-shadow: var(--shadow-sm);
}
.node-card:hover {
  border-color: var(--accent); box-shadow: var(--shadow);
  transform: translateX(2px);
}
.node-card.active { border-color: var(--accent); background: var(--accent-soft); }
.node-card.has-children { padding-right: 12px; }

.node-emoji { display: inline-flex; align-items: center; }
.node-emoji svg { width: 18px; height: 18px; stroke: var(--accent) !important; }
.node-label {
  font-family: var(--font); font-size: 14px; font-weight: 500;
  color: var(--text); letter-spacing: -0.005em;
}
.node-count {
  font-size: 11px; color: var(--text-muted); font-weight: 500;
  background: var(--bg-alt);
  padding: 2px 8px; border-radius: 999px; margin-left: 4px;
}
.node-expand {
  font-size: 11px; color: var(--text-muted); margin-left: 4px;
  transition: transform 0.2s ease;
}
.node-expand.open { transform: rotate(90deg); color: var(--accent); }
.node-code {
  font-size: 11px; color: var(--text-muted); letter-spacing: 0.4px;
  font-weight: 500;
}

.node-card.root {
  border-color: var(--accent); padding: 14px 20px;
  background: var(--accent-soft);
  box-shadow: var(--shadow);
}
.node-card.root .node-label { font-size: 15px; color: var(--text-strong); font-weight: 600; }

.node-card.category { background: var(--bg-alt); border-color: transparent; }
.node-card.category .node-label { color: var(--text-strong); font-weight: 600; }

.node-card.format .node-label { color: var(--text-strong); font-weight: 600; }

.node-card.leaf {
  padding: 6px 12px; background: transparent; border-color: transparent;
  box-shadow: none;
}
.node-card.leaf .node-label { font-size: 12px; font-weight: 400; color: var(--text-muted); }
.node-card.leaf:hover { background: var(--bg-alt); }
.node-card.leaf:hover .node-label { color: var(--text); }

.node-card.subgroup {
  border-style: dashed; padding: 6px 12px; background: transparent;
  box-shadow: none;
}
.node-card.subgroup .node-label {
  font-size: 12px; font-style: italic; color: var(--text-muted); font-weight: 500;
}

.node-card.highlight {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft), var(--shadow);
}

/* Detail panel (right side) */
.detail-overlay {
  display: none; position: fixed; top: 0; right: 0; bottom: 0;
  width: 380px; background: var(--surface);
  border-left: 1px solid var(--border-soft);
  z-index: 200; overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: slideInFromRight 0.28s ease;
}
.detail-overlay.open { display: block; }
@keyframes slideInFromRight { from { transform: translateX(100%); } to { transform: translateX(0); } }

.detail-close {
  position: absolute; top: 16px; right: 16px;
  background: var(--bg-alt); border: none;
  color: var(--text); font-size: 16px; cursor: pointer;
  width: 32px; height: 32px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.detail-close:hover { background: var(--border-color); }

.detail-content { padding: 60px 28px 32px; }
.detail-code { font-size: 11px; color: var(--text-muted); letter-spacing: 0.5px; margin-bottom: 4px; }
.detail-name {
  font-family: var(--font); font-size: 26px; font-weight: 600;
  letter-spacing: -0.012em; color: var(--text-strong); margin-bottom: 12px;
}
.detail-desc { font-size: 15px; color: var(--text); line-height: 1.5; margin-bottom: 20px; }
.detail-meta { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 20px; }
.detail-tag {
  font-size: 12px; color: var(--text); font-weight: 500;
  padding: 4px 10px; background: var(--bg-alt); border-radius: 999px;
}
.detail-tiers { margin-bottom: 22px; }
.detail-tier-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 0; border-bottom: 1px solid var(--border-soft);
  font-size: 14px;
}
.detail-tier-name { color: var(--text); }
.detail-tier-price {
  font-family: var(--font); color: var(--text-strong); font-weight: 600;
  letter-spacing: -0.008em;
}
.detail-book-btn {
  display: block; width: 100%; padding: 12px;
  border-radius: 999px;
  background: var(--accent); color: #fff;
  font-family: var(--font); font-size: 15px; font-weight: 500;
  border: none; cursor: pointer; text-align: center;
  transition: var(--transition);
}
.detail-book-btn:hover { background: var(--accent-hover); }

/* Responsive */
@media (max-width: 768px) {
  .explorer-toolbar { padding: 10px 16px; gap: 8px; }
  .explorer-toolbar input { min-width: 140px; flex: 1; }
  .explorer-stats { width: 100%; text-align: center; }
  .tree-root { flex-direction: column; align-items: flex-start; }
  .tree-node { flex-direction: column; align-items: flex-start; }
  .tree-children { margin-left: 0; padding-left: 22px; margin-top: 4px; }
  .tree-child-wrapper::before, .tree-child-wrapper::after { left: -22px; }
  .tree-child-wrapper::after { width: 22px; }
  .detail-overlay { width: 100%; }
  .zoom-controls { bottom: 16px; right: 16px; }
}