/* element selector */
body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  margin: 24px;
  line-height: 1.5;
  color: #1e293b;
  background: #f8fafc;
}

h1, h2 { margin: 0.6em 0 0.4em; }

/* class selectors */
.accent { color: #0f766e; }
.lede   { color: #475569; margin-top: 4px; }
.bullets { padding-left: 1.2em; }

.tip {
  background: #ecfeff;
  border-left: 4px solid #06b6d4;
  padding: 6px 10px;
  margin: 6px 0;
}

.caption { color: #64748b; font-size: 0.95rem; }
.ext { text-decoration: underline; }

/* id selector */
#diagram {
  max-width: 520px;
  width: 100%;
  display: block;
  margin: 8px 0 4px;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  background: #ffffff;
}