* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", system-ui, sans-serif;
  background: #fafaf7;
  color: #1a1a1a;
  line-height: 1.5;
}
header {
  padding: 3rem 2rem 2rem;
  text-align: center;
  background: linear-gradient(180deg, #f4f1e8 0%, #fafaf7 100%);
  border-bottom: 1px solid #e6e3d8;
}
header h1 { font-size: 2.5rem; margin: 0 0 .25rem; font-weight: 600; letter-spacing: -.02em; }
header .sub { color: #6b6b6b; margin: 0; font-size: 1rem; }
main { max-width: 1100px; margin: 0 auto; padding: 2rem; }
section { margin-bottom: 3rem; }
h2 { font-size: 1.25rem; margin: 0 0 1rem; font-weight: 600; }
#tree-mount {
  min-height: 400px;
  background: #fff;
  border: 1px solid #e6e3d8;
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
}
.node circle { fill: #fff; stroke: #555; stroke-width: 2px; }
.node text { font: 13px sans-serif; }
.link { fill: none; stroke: #ccc; stroke-width: 1.5px; }
.meta ol { padding-left: 1.5rem; }
.meta li { margin: .5rem 0; }
.meta .name { font-weight: 600; }
.meta .dates { color: #6b6b6b; font-size: .9rem; margin-left: .5rem; }
.open ul { padding-left: 1.5rem; color: #555; }
footer { padding: 2rem; text-align: center; color: #888; font-size: .85rem; }
footer a { color: #555; }