:root {
  --bg: #f7fbfb;
  --surface: #ffffff;
  --card: #ecfdf5;
  --border: #cdeae3;
  --text: #1a3d5c;
  --text-muted: #4a6b82;
  --accent: #0d9488;
  --accent-soft: rgba(13, 148, 136, 0.12);
  --accent-strong: #0f766e;
  --brand-violet: #5b21b6;
  --brand-magenta: #c026d3;
  --success: #0d9488;
  --warn: #9a6700;
  --danger: #cf222e;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Source Serif 4', Georgia, serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}
body.in-iframe nav,
body.in-iframe footer {
  display: none !important;
}
.wrapper { max-width: 820px; margin: 0 auto; padding: 2rem 1.5rem; }
nav {
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}
nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-family: 'JetBrains Mono', monospace;
}
nav a:hover { color: var(--accent); }
h1 {
  font-size: 1.65rem;
  font-weight: 700;
  margin: 0 0 1rem 0;
  letter-spacing: -0.02em;
  color: var(--brand-violet);
}
h2 { font-size: 1.2rem; margin: 1.75rem 0 0.6rem 0; color: var(--accent-strong); }
h3 { font-size: 1.05rem; margin: 1.25rem 0 0.5rem 0; }
p { margin: 0 0 1rem 0; }
.diagram-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  margin: 1.25rem 0;
  overflow-x: auto;
}
.diagram-wrap .mermaid { display: flex; justify-content: center; }
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}
th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  text-align: left;
}
th { background: var(--surface); color: var(--accent); font-family: 'JetBrains Mono', monospace; }
code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  background: var(--card);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--text);
}
ul, ol { margin: 0 0 1rem 0; padding-left: 1.5rem; }
li { margin: 0.25rem 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
footer {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
}
footer a { color: var(--text-muted); }