/* ===================================
   Tree Notes Component (ツリー構造メモ)
   =================================== */

.tree-container {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.tree-node {
  position: relative;
  padding-left: 1.75rem;
}

/* 縦のガイド線 */
.tree-node::before {
  content: '';
  position: absolute;
  left: 0.65rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-line);
}

/* 横の接続線 (L字コネクタ) */
.tree-node::after {
  content: '';
  position: absolute;
  left: 0.65rem;
  top: 1.25rem;
  width: 0.85rem;
  height: 2px;
  background: var(--color-line);
}

/* 最後のノードの縦線はL字の高さで止める */
.tree-node:last-child::before {
  bottom: calc(100% - 1.25rem);
}

/* ルートノードはインデントおよび接続線なし */
.tree-node-root {
  padding-left: 0;
}

.tree-node-root::before,
.tree-node-root::after {
  display: none;
}

.tree-node-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.tree-node-card:hover {
  border-color: var(--color-line-strong);
  box-shadow: var(--shadow-sm);
}

.tree-node-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.45rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.tree-node-content {
  font-size: 0.92rem;
  color: var(--color-text);
  white-space: pre-wrap;
  word-break: break-word;
  margin-bottom: 0.65rem;
  line-height: 1.6;
}

.tree-node-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tree-children {
  margin-top: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

/* --- Note Types (Subtle Badges) --- */
.type-badge {
  font-size: 0.72rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  letter-spacing: 0.03em;
  font-family: var(--font-mono);
}

.type-requirement { background: #203544; color: #76BCE8; border: 1px solid #2F4D63; }
.type-meeting     { background: #3B2E24; color: #E8A876; border: 1px solid #574435; }
.type-contact     { background: #332644; color: #C69AE8; border: 1px solid #4D3966; }
.type-note        { background: #383840; color: #A8A8B2; border: 1px solid #4C4C56; }