:root {
  --tree-node-bg: rgba(16, 185, 149, 0.06);
  --tree-border: rgba(16, 185, 149, 0.2);
  --tree-match-bg: rgba(250, 204, 21, 0.28);
}

.tree-viewer-main {
  padding-top: 52px;
}

.tree-viewer-tool {
  width: 100%;
  margin: 0 auto 32px;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.tree-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--soft);
}

.tree-toolbar-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.tree-layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  min-height: 560px;
}

.tree-input-panel,
.tree-output-panel {
  min-width: 0;
  min-height: 100%;
}

.tree-input-panel textarea {
  display: block;
  width: 100%;
  min-height: 520px;
  border: 0;
  resize: vertical;
  background: var(--bg);
  color: var(--text);
  padding: 16px;
  font: 13px/1.7 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  outline: none;
}

.tree-output-panel {
  background: var(--bg);
}

.tree-metrics {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
}

.tree-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.tree-search {
  flex: 1 1 180px;
  min-width: 160px;
}

.tree-search input {
  width: 100%;
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: 13px/1.4 inherit;
  padding: 7px 10px;
}

.tree-search input:focus,
.tree-search input:focus-visible,
.panel-action:focus-visible,
button:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.tree-output {
  min-height: 420px;
  max-height: 620px;
  overflow: auto;
  padding: 14px 16px 18px;
  background: var(--bg);
  color: var(--text);
}

.tree-placeholder {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.tree-root {
  margin: 0;
  padding: 0;
  list-style: none;
}

.tree-node {
  min-width: 0;
}

.tree-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  min-width: 0;
  padding: 3px 0;
  border-radius: 6px;
  cursor: pointer;
}

.tree-row:hover {
  background: rgba(16, 185, 149, 0.04);
}

.tree-row.selected {
  background: rgba(16, 185, 149, 0.08);
}

.tree-row.match-target {
  background: rgba(250, 204, 21, 0.1);
  box-shadow: inset 0 0 0 1px rgba(250, 204, 21, 0.24);
}

.tree-summary {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 4px 0;
  cursor: pointer;
  list-style: none;
}

.tree-summary::-webkit-details-marker {
  display: none;
}

.tree-summary::before {
  content: "▸";
  color: var(--muted);
  font-size: 11px;
  line-height: 1;
  width: 10px;
  display: inline-block;
}

.tree-group[open] > .tree-summary::before {
  content: "▾";
}

.tree-key {
  color: #7ccafc;
  font-weight: 600;
  min-width: 0;
  overflow-wrap: anywhere;
}

.tree-kind {
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.tree-count {
  color: var(--muted);
  font-size: 10px;
}

.tree-children {
  margin: 0 0 0 18px;
  padding: 0 0 0 12px;
  border-left: 1px solid var(--line);
  list-style: none;
}

.tree-leaf-value {
  min-width: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.tree-value-string {
  color: #a7f3d0;
}

.tree-value-number {
  color: #f9d29d;
}

.tree-value-boolean {
  color: #d7b8ff;
}

.tree-value-null {
  color: #f9a8d4;
}

.tree-empty {
  color: var(--muted);
  font-style: italic;
}

.tree-summary .tree-key.root-key {
  color: var(--accent);
}

.tree-value-mark,
.tree-key-mark {
  background: var(--tree-match-bg);
  color: inherit;
  border-radius: 3px;
  padding: 0 2px;
}

.selection-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  font-size: 12px;
}

.selection-row > span {
  min-width: 0;
  overflow-wrap: anywhere;
}

.error-box {
  margin: 0 14px 14px;
  border: 1px solid rgba(239, 68, 68, 0.5);
  background: rgba(239, 68, 68, 0.08);
  color: #fca5a5;
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.5;
}

.match-count {
  color: var(--muted);
  font-size: 11px;
  white-space: nowrap;
}

.panel-action {
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: 12px/1.2 inherit;
  font-weight: 700;
  padding: 7px 10px;
  cursor: pointer;
}

.panel-action:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

@media (max-width: 900px) {
  .tree-layout {
    grid-template-columns: 1fr;
  }

  .tree-input-panel textarea {
    min-height: 300px;
  }
}

@media (max-width: 600px) {
  .tree-viewer-main {
    padding-top: 32px;
  }

  .tree-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .tree-toolbar-group {
    width: 100%;
  }

  .tree-toolbar-group > button {
    flex: 1 1 0;
  }

  .tree-controls {
    flex-wrap: wrap;
  }

  .selection-row {
    flex-direction: column;
    align-items: stretch;
  }
}