.concept-map-tool {
  --cmt-ink: #17202a;
  --cmt-muted: #657282;
  --cmt-line: rgba(23, 32, 42, 0.13);
  --cmt-hairline: rgba(23, 32, 42, 0.065);
  --cmt-paper: #f7f9fc;
  --cmt-panel: rgba(255, 255, 255, 0.86);
  --cmt-glass: rgba(255, 255, 255, 0.54);
  --cmt-inverse: #fff;
  --cmt-accent: #146c5f;
  --cmt-accent-2: #234f9f;
  --cmt-warm: #d68b28;
  --cmt-shadow: rgba(25, 39, 52, 0.14);

  width: 100%;
  display: grid;
  gap: 0;
  padding: 0;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(20, 108, 95, 0.1), transparent 38%),
    linear-gradient(315deg, rgba(214, 139, 40, 0.12), transparent 42%),
    var(--cmt-paper);
  color: var(--cmt-ink);
  border: 1px solid var(--cmt-line);
  border-radius: 8px;
  box-shadow: 0 18px 44px var(--cmt-shadow);
}

.theme-dark .concept-map-tool {
  --cmt-ink: #f4f7fb;
  --cmt-muted: #a5b2c1;
  --cmt-line: rgba(244, 247, 251, 0.16);
  --cmt-hairline: rgba(244, 247, 251, 0.08);
  --cmt-paper: #0d1117;
  --cmt-panel: rgba(19, 26, 34, 0.9);
  --cmt-glass: rgba(19, 26, 34, 0.62);
  --cmt-accent: #4db7a8;
  --cmt-accent-2: #87a8ff;
  --cmt-warm: #f0ad55;
  --cmt-shadow: rgba(0, 0, 0, 0.32);
}

.cmt-editor,
.cmt-stage {
  min-width: 0;
}

.cmt-editor {
  display: grid;
  grid-template-rows: auto minmax(15rem, 1fr);
  gap: 0.35rem;
  padding: 0.9rem;
  background: linear-gradient(90deg, var(--cmt-glass), rgba(255, 255, 255, 0));
  backdrop-filter: blur(12px);
}

.cmt-editor-actions,
.cmt-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}

.cmt-editor-actions {
  min-height: 2rem;
  justify-content: space-between;
}

.cmt-editor-actions label {
  color: var(--cmt-muted);
  font-size: 0.76rem;
  font-weight: 850;
  text-transform: uppercase;
}

.cmt-editor-actions > div {
  display: flex;
  gap: 0.7rem;
}

.concept-map-tool button {
  min-height: 2.35rem;
  border: 1px solid var(--cmt-line);
  border-radius: 6px;
  background: var(--cmt-panel);
  color: var(--cmt-ink);
  cursor: pointer;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 820;
  line-height: 1.08;
  overflow-wrap: anywhere;
  padding: 0 0.7rem;
  white-space: normal;
}

.concept-map-tool button:hover {
  border-color: var(--cmt-accent);
  color: var(--cmt-accent);
}

.cmt-editor-actions button {
  min-height: 1.7rem;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: color-mix(in srgb, var(--cmt-ink) 58%, transparent);
  font-size: 0.72rem;
  font-weight: 760;
  padding: 0;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, currentcolor 34%, transparent);
  text-underline-offset: 0.22rem;
}

.cmt-editor textarea {
  width: 100%;
  min-height: 15rem;
  resize: vertical;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--cmt-ink);
  font: 600 0.94rem/1.55 ui-monospace, SFMono-Regular, Consolas, monospace;
  outline: 0;
  padding: 0.55rem 0.35rem 0.75rem 0;
}

.cmt-editor textarea:focus {
  box-shadow: inset 2px 0 0 color-mix(in srgb, var(--cmt-accent) 62%, transparent);
}

.cmt-stage {
  min-width: 0;
  padding: 0.55rem;
}

.cmt-canvas-shell {
  position: relative;
  min-height: 28rem;
  overflow: hidden;
  border: 0;
  border-radius: 6px;
  background:
    radial-gradient(circle at 24% 16%, rgba(20, 108, 95, 0.09), transparent 32%),
    linear-gradient(145deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.36));
  cursor: grab;
  touch-action: none;
}

.theme-dark .cmt-canvas-shell {
  background:
    radial-gradient(circle at 24% 16%, rgba(77, 183, 168, 0.1), transparent 32%),
    linear-gradient(145deg, rgba(19, 26, 34, 0.84), rgba(13, 17, 23, 0.68));
}

.cmt-canvas-shell:active {
  cursor: grabbing;
}

.cmt-metrics {
  position: absolute;
  top: 0.85rem;
  right: 0.9rem;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 0.8rem;
  pointer-events: none;
}

.cmt-metrics span {
  display: flex;
  align-items: baseline;
  gap: 0.22rem;
  color: color-mix(in srgb, var(--cmt-ink) 42%, transparent);
  font-size: 0.68rem;
  font-weight: 520;
  line-height: 1;
  text-transform: uppercase;
}

.cmt-metrics strong {
  color: color-mix(in srgb, var(--cmt-ink) 48%, transparent);
  font-size: clamp(1.45rem, 5vw, 3.2rem);
  font-weight: 300;
  letter-spacing: 0;
  line-height: 1;
}

.cmt-toolbar {
  position: absolute;
  right: 0.8rem;
  bottom: 0.8rem;
  z-index: 4;
  justify-content: flex-end;
  gap: 0.18rem;
  padding: 0.22rem;
  border: 1px solid var(--cmt-hairline);
  border-radius: 8px;
  background: color-mix(in srgb, var(--cmt-panel) 82%, transparent);
  box-shadow: 0 16px 38px rgba(25, 39, 52, 0.12);
  backdrop-filter: blur(14px);
}

.cmt-toolbar button:first-child,
.cmt-toolbar button:nth-child(3) {
  width: 2.35rem;
  padding: 0;
  font-size: 1rem;
}

.cmt-toolbar button:nth-last-child(-n + 2) {
  border-color: var(--cmt-hairline);
  background: transparent;
  color: var(--cmt-accent);
}

.cmt-canvas {
  width: 100%;
  height: 100%;
  min-height: 28rem;
  display: block;
}

.cmt-canvas pattern circle {
  fill: rgba(101, 114, 130, 0.26);
}

.cmt-grid {
  fill: url("#cmt-dot-grid");
}

.cmt-links path {
  fill: none;
  stroke: rgba(35, 79, 159, 0.32);
  stroke-linecap: round;
  stroke-width: 2.5;
}

.theme-dark .cmt-links path {
  stroke: rgba(135, 168, 255, 0.46);
}

.cmt-node {
  cursor: move;
}

.cmt-node rect {
  fill: var(--cmt-panel);
  stroke: color-mix(in srgb, var(--cmt-ink) 18%, transparent);
  stroke-width: 1;
  filter: drop-shadow(0 12px 18px rgba(25, 39, 52, 0.12));
}

.cmt-node text {
  fill: var(--cmt-ink);
  font-size: 13px;
  font-weight: 780;
  pointer-events: none;
}

.cmt-node-label {
  line-height: 1.15;
}

.cmt-node-depth {
  fill: var(--cmt-muted);
  font-size: 9px;
  font-weight: 760;
  opacity: 0.4;
}

.cmt-toggle {
  cursor: pointer;
  opacity: 0;
  transition: opacity 160ms ease, transform 160ms ease;
}

.cmt-node:hover .cmt-toggle,
.cmt-toggle:hover {
  opacity: 1;
}

.cmt-toggle circle {
  fill: color-mix(in srgb, var(--cmt-ink) 72%, transparent);
  stroke: var(--cmt-panel);
  stroke-width: 2.5;
}

.cmt-toggle text {
  fill: var(--cmt-inverse);
  font-size: 12px;
  font-weight: 760;
}

.cmt-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 0.3rem;
  padding: 1rem;
  text-align: center;
  background: rgba(247, 249, 252, 0.88);
}

.theme-dark .cmt-empty {
  background: rgba(13, 17, 23, 0.9);
}

.cmt-empty[hidden] {
  display: none;
}

.cmt-empty strong {
  font-size: 1.2rem;
}

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

@media (min-width: 860px) {
  .concept-map-tool {
    grid-template-columns: minmax(18rem, 0.42fr) minmax(0, 0.58fr);
  }

  .cmt-editor {
    border-right: 1px solid var(--cmt-hairline);
    padding: 1rem 1.05rem 1rem 1.1rem;
  }

  .cmt-stage {
    padding: 0.65rem;
  }

  .cmt-editor textarea,
  .cmt-canvas,
  .cmt-canvas-shell {
    min-height: 38rem;
  }
}

@media (max-width: 520px) {
  .cmt-metrics {
    left: 0.75rem;
    right: auto;
    grid-template-columns: repeat(3, auto);
    gap: 0.48rem;
  }

  .cmt-metrics span {
    font-size: 0.6rem;
  }

  .cmt-toolbar {
    left: 0.55rem;
    right: 0.55rem;
    display: grid;
    grid-template-columns: 2.35rem minmax(0, 1fr) 2.35rem repeat(2, minmax(0, 1fr));
    justify-content: stretch;
  }

  .cmt-toolbar button {
    min-width: 0;
    padding-inline: 0.45rem;
  }
}