:root {
  --bg: #ffffff;
  --chrome: #f3f3f3;
  --panel: #f8f8f8;
  --border: #e2e2e2;
  --text: #1f1f1f;
  --muted: #6b6b6b;
  --accent: #0a66c2;
  --hover: #ececec;
  --selected: #d6e8fb;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
}

* {
  box-sizing: border-box;
}

html,
body,
#root {
  height: 100%;
  margin: 0;
}

#root {
  height: 100vh;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
}

/* ── Title bar ─────────────────────────────────────────────────────────── */
.titlebar {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  flex-shrink: 0;
  padding: 0 8px;
  background: var(--chrome);
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}

.app-title {
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

.file-name {
  color: var(--muted);
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 40vw;
}

.spacer {
  flex: 1;
}

.icon-btn,
.text-btn {
  font: inherit;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  border-radius: 5px;
  padding: 4px 8px;
  line-height: 1;
}

.icon-btn {
  font-size: 16px;
  width: 30px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.icon-btn:hover,
.text-btn:hover:not(:disabled) {
  background: var(--hover);
}

.text-btn {
  border-color: var(--border);
  font-size: 12px;
  background: #fff;
}

.text-btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.error-bar {
  flex-shrink: 0;
  padding: 8px 12px;
  background: #fdecea;
  color: #a4231f;
  font-size: 12.5px;
  border-bottom: 1px solid #f3c2bf;
}

/* ── Empty state ───────────────────────────────────────────────────────── */
.empty-state {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 24px;
}

.empty-inner {
  border: 2px dashed #c4c4c4;
  border-radius: 12px;
  padding: 48px 56px;
  text-align: center;
  color: var(--muted);
  max-width: 460px;
}

.empty-state.over .empty-inner {
  border-color: var(--accent);
  background: #f0f7ff;
}

.empty-icon {
  font-size: 40px;
  color: #b9b9b9;
}

.empty-inner h2 {
  margin: 12px 0 6px;
  color: var(--text);
  font-size: 18px;
}

.empty-inner p {
  margin: 4px 0;
  font-size: 13px;
}

code {
  font-family: var(--mono);
  background: #efefef;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.92em;
}

.muted {
  color: var(--muted);
}
.small {
  font-size: 12px;
}

/* ── Body / panels ─────────────────────────────────────────────────────── */
.body {
  flex: 1;
  display: flex;
  min-height: 0;
  position: relative;
}

.panel {
  display: flex;
  flex-direction: column;
  background: var(--panel);
  min-width: 0;
  overflow: hidden;
}

.panel.right {
  background: #fbfbfb;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  height: 30px;
  padding: 0 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.panel-body {
  flex: 1;
  overflow: auto;
}

.center {
  flex: 1;
  position: relative;
  min-width: 0;
  background: #fff;
}

.figure-host {
  position: absolute;
  inset: 0;
}

.drop-hint {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 102, 194, 0.08);
  border: 2px dashed var(--accent);
  color: var(--accent);
  font-weight: 600;
  pointer-events: none;
}

/* ── Divider ───────────────────────────────────────────────────────────── */
.divider {
  width: 6px;
  flex-shrink: 0;
  cursor: col-resize;
  background: transparent;
  position: relative;
}

.divider::after {
  content: "";
  position: absolute;
  inset: 0 2px;
  background: var(--border);
}

.divider:hover::after {
  background: var(--accent);
}

/* ── Tree ──────────────────────────────────────────────────────────────── */
.tree {
  padding: 4px 0;
  font-size: 13px;
  user-select: none;
}

.tree-row {
  display: flex;
  align-items: center;
  height: 24px;
  padding-right: 8px;
  cursor: pointer;
  white-space: nowrap;
}

.tree-row:hover {
  background: var(--hover);
}

.tree-row.selected {
  background: var(--selected);
}

.twisty {
  width: 16px;
  flex-shrink: 0;
  text-align: center;
  color: var(--muted);
  font-size: 10px;
}

.twisty.leaf {
  visibility: hidden;
}

.node-icon {
  width: 18px;
  flex-shrink: 0;
  text-align: center;
  color: var(--muted);
}

.icon-figure {
  color: #7a5cc4;
}
.icon-axes {
  color: #2f8f5b;
}
.icon-trace {
  color: #c2731f;
}
.icon-dataset {
  color: #8a8a8a;
}

.node-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-row.dimmed .node-label,
.tree-row.dimmed .node-icon {
  opacity: 0.4;
}

/* ── Row visibility controls ───────────────────────────────────────────── */
.row-actions {
  display: flex;
  align-items: center;
  gap: 1px;
  margin-left: 4px;
  flex-shrink: 0;
  visibility: hidden;
}

.tree-row:hover .row-actions,
.tree-row.selected .row-actions,
.tree-row.el-hidden .row-actions {
  visibility: visible;
}

.act-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 20px;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  border-radius: 4px;
  padding: 0;
}

.act-btn:hover {
  background: rgba(0, 0, 0, 0.08);
  color: var(--text);
}

.act-btn.active {
  color: var(--accent);
}

.head-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.link-btn {
  font: inherit;
  font-size: 11px;
  text-transform: none;
  letter-spacing: 0;
  border: none;
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  padding: 0;
}

.link-btn:hover {
  text-decoration: underline;
}

.center-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--muted);
}

.center-overlay button {
  margin-top: 8px;
}

/* ── Info panel ────────────────────────────────────────────────────────── */
.info {
  padding: 10px 12px;
  font-size: 13px;
}

.info.empty {
  color: var(--muted);
}

.info-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 10px;
}

.info-title {
  font-weight: 600;
  word-break: break-word;
}

.info-kind {
  margin-left: auto;
  font-size: 11px;
  color: var(--muted);
  background: #ededed;
  padding: 1px 7px;
  border-radius: 10px;
}

table.props {
  width: 100%;
  border-collapse: collapse;
}

table.props td {
  padding: 3px 6px;
  vertical-align: top;
  border-bottom: 1px solid #efefef;
}

td.pk {
  color: var(--muted);
  width: 38%;
  font-size: 12px;
}

td.pv {
  font-family: var(--mono);
  font-size: 12px;
  word-break: break-word;
}

.swatch {
  display: inline-block;
  width: 11px;
  height: 11px;
  border-radius: 2px;
  border: 1px solid #00000022;
  margin-right: 6px;
  vertical-align: middle;
}

.preview-label {
  margin: 12px 0 4px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.preview {
  margin: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  background: #f4f4f4;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 48vh;
  overflow: auto;
}

.vfooter {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.text-btn.sm {
  padding: 2px 8px;
  font-size: 11px;
}

/* ── Mobile drawers ────────────────────────────────────────────────────── */
.panel.drawer {
  position: absolute;
  top: 0;
  bottom: 0;
  width: min(82%, 340px);
  z-index: 20;
  box-shadow: 0 0 24px rgba(0, 0, 0, 0.22);
}

.panel.left.drawer {
  left: 0;
}

.panel.right.drawer {
  right: 0;
}

.backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.28);
  z-index: 10;
}

/* ── Toast ─────────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  z-index: 50;
  max-width: 90vw;
  padding: 9px 16px;
  border-radius: 8px;
  background: #2b2b2b;
  color: #fff;
  font-size: 13px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  animation: toast-in 0.15s ease-out;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translate(-50%, 6px);
  }
  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

/* Touch / narrow screens: no hover, so always show the row controls. */
@media (max-width: 820px) {
  .row-actions {
    visibility: visible;
  }
}

/* Narrow screens: drop the redundant filename (shown in the tree root). */
@media (max-width: 560px) {
  .file-name {
    display: none;
  }
}