:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --border: #2d3a4f;
  --text: #e8edf4;
  --muted: #8b9cb3;
  --accent: #3b82f6;
  --branch: #22c55e;
  --leaf: #a78bfa;
  --xref: #f59e0b;
  --center: #ef4444;
  --font: "SF Pro Text", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
}

.layout {
  display: grid;
  grid-template-rows: auto 1fr;
  height: 100vh;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

header h1 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

header p {
  margin: 0.15rem 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge.mode-1 { background: #1e3a5f; color: #93c5fd; }
.badge.mode-2 { background: #14532d; color: #86efac; }

.toolbar {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.toolbar button, .toolbar a {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  padding: 0.35rem 0.7rem;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  text-decoration: none;
}

.toolbar button:hover, .toolbar a:hover {
  border-color: var(--accent);
}

main {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 0;
}

aside {
  border-right: 1px solid var(--border);
  padding: 1rem;
  overflow: auto;
  background: #121820;
}

aside h2 {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

aside pre {
  margin: 0 0 1rem;
  padding: 0.75rem;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.72rem;
  line-height: 1.45;
  overflow: auto;
  white-space: pre-wrap;
}

.legend {
  display: grid;
  gap: 0.4rem;
  font-size: 0.78rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.legend-line {
  width: 24px;
  height: 0;
  border-top: 2px dashed var(--xref);
  flex-shrink: 0;
}

.canvas-wrap {
  position: relative;
  overflow: hidden;
  min-height: 0;
  height: 100%;
  background:
    radial-gradient(circle at 50% 50%, #1a2332 0%, transparent 70%),
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: auto, 40px 40px, 40px 40px;
  cursor: grab;
}

.canvas-wrap.is-dragging { cursor: grabbing; }

#viewport {
  width: 100%;
  height: 100%;
  transform-origin: 0 0;
}

svg.mindmap {
  width: 100%;
  height: 100%;
  display: block;
}

.link-tree {
  fill: none;
  stroke: var(--border);
  stroke-width: 2;
  opacity: 0.7;
}

.link-xref {
  fill: none;
  stroke: var(--xref);
  stroke-width: 1.5;
  stroke-dasharray: 6 4;
  opacity: 0.85;
}

.link-xref-ext {
  fill: none;
  stroke: #eab308;
  stroke-width: 1.5;
  stroke-dasharray: 4 3;
  opacity: 0.9;
}

.link-xref-term {
  fill: none;
  stroke: #fcd34d;
  stroke-width: 1.5;
  stroke-dasharray: 2 3;
  opacity: 0.9;
}

.node circle, .node rect {
  stroke-width: 2;
  transition: filter 0.15s, stroke-width 0.15s;
}

.node.center circle { fill: var(--center); stroke: #fca5a5; }
.node.branch circle { fill: var(--branch); stroke: #86efac; }
.node.file circle { fill: #0ea5e9; stroke: #7dd3fc; }
.node.leaf circle { fill: var(--leaf); stroke: #c4b5fd; r: 6; }
.node.external circle { fill: #422006; stroke: #eab308; r: 10; }
.node.term circle { fill: #713f12; stroke: #fcd34d; r: 9; }

.node text {
  fill: var(--text);
  font-size: 12px;
  font-family: var(--font);
  pointer-events: none;
  user-select: none;
}

.node.is-highlight circle,
.node.is-highlight rect {
  filter: drop-shadow(0 0 8px var(--accent));
  stroke-width: 3;
}

.node.is-dimmed { opacity: 0.25; }

.link-xref.is-highlight,
.link-xref-ext.is-highlight,
.link-xref-term.is-highlight { stroke-width: 2.5; opacity: 1; }
.link-xref.is-dimmed,
.link-xref-ext.is-dimmed,
.link-xref-term.is-dimmed { opacity: 0.1; }

.hint {
  position: absolute;
  bottom: 12px;
  right: 12px;
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  background: rgba(0,0,0,0.55);
  font-size: 0.72rem;
  color: var(--muted);
  pointer-events: none;
}

@media (max-width: 900px) {
  main { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
  aside { max-height: 200px; border-right: none; border-bottom: 1px solid var(--border); }
}