.mindmap-shell {
  --mindmap-bg: #f8fafc;
  --mindmap-panel: #ffffff;
  --mindmap-border: #cbd5e1;
  --mindmap-text: #0f172a;
  --mindmap-muted: #475569;
  --mindmap-line: #94a3b8;
  --mindmap-root: #e0f2fe;
  --mindmap-root-border: #0284c7;
  --mindmap-section: #f0fdf4;
  --mindmap-section-border: #16a34a;
  --mindmap-topic: #fff7ed;
  --mindmap-topic-border: #ea580c;
  --mindmap-leaf: #fdf2f8;
  --mindmap-leaf-border: #db2777;
  background: var(--mindmap-bg);
  border: 1px solid var(--mindmap-border);
  border-radius: 8px;
  min-height: 680px;
  height: min(78vh, 820px);
  position: relative;
  overflow: hidden;
  box-shadow: 0 16px 36px rgba(15, 23, 42, 0.08);
}

.mindmap-toolbar {
  align-items: center;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--mindmap-border);
  border-radius: 8px;
  display: flex;
  gap: 6px;
  left: 14px;
  padding: 6px;
  position: absolute;
  top: 14px;
  z-index: 2;
  backdrop-filter: blur(10px);
}

.mindmap-toolbar button {
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--mindmap-border);
  border-radius: 6px;
  color: var(--mindmap-text);
  cursor: pointer;
  display: inline-flex;
  font-size: 14px;
  font-weight: 700;
  height: 34px;
  justify-content: center;
  line-height: 1;
  min-width: 34px;
  padding: 0 10px;
}

.mindmap-toolbar button:hover,
.mindmap-toolbar button:focus-visible {
  border-color: #0284c7;
  color: #0369a1;
  outline: none;
}

.mindmap-canvas {
  cursor: grab;
  display: block;
  height: 100%;
  touch-action: none;
  width: 100%;
}

.mindmap-canvas.is-panning {
  cursor: grabbing;
}

.mindmap-link {
  fill: none;
  stroke: var(--mindmap-line);
  stroke-linecap: round;
  stroke-width: 2.4;
}

.mindmap-node {
  cursor: pointer;
}

.mindmap-node rect {
  filter: drop-shadow(0 8px 14px rgba(15, 23, 42, 0.08));
  transition: stroke-width 120ms ease, filter 120ms ease;
}

.mindmap-node:hover rect,
.mindmap-node:focus-visible rect {
  filter: drop-shadow(0 10px 18px rgba(15, 23, 42, 0.14));
  stroke-width: 2.8;
  outline: none;
}

.mindmap-node text {
  fill: var(--mindmap-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  pointer-events: none;
}

.mindmap-node-title {
  font-size: 15px;
  font-weight: 760;
}

.mindmap-node-subtitle {
  fill: var(--mindmap-muted);
  font-size: 12px;
  font-weight: 520;
}

.mindmap-toggle {
  fill: #ffffff;
  stroke: #64748b;
  stroke-width: 1.7;
}

.mindmap-toggle-label {
  fill: #334155;
  font-size: 15px;
  font-weight: 800;
}

.mindmap-open-link {
  fill: #e0f2fe;
  stroke: #0284c7;
  stroke-width: 1.5;
}

.mindmap-open-label {
  fill: #0369a1;
  font-size: 13px;
  font-weight: 800;
}

.mindmap-empty {
  color: var(--mindmap-muted);
  padding: 32px;
}

@media (max-width: 720px) {
  .mindmap-shell {
    min-height: 560px;
    height: 72vh;
  }

  .mindmap-toolbar {
    flex-wrap: wrap;
    max-width: calc(100% - 28px);
  }
}