*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --paper: #f4f1ea; --paper-dark: #ebe6dc; --ink: #141414; --ink-soft: #4a4a46;
  --ink-faint: #8a8780; --line: #d4cfc4; --accent: #9a3412; --accent-hover: #7c2d12; --max: 1120px;
}
html { font-size: 17px; scroll-behavior: smooth; }
body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--paper); color: var(--ink); line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.shell { min-height: 100vh; display: grid; grid-template-rows: auto 1fr auto; }
header {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  padding: 0.85rem clamp(1.25rem, 4vw, 2.5rem); border-bottom: 1px solid var(--line);
  background: var(--paper); position: sticky; top: 0; z-index: 10;
}
.wordmark { font-size: 0.95rem; font-weight: 600; letter-spacing: -0.02em; }
.wordmark span { color: var(--ink-faint); font-weight: 400; }
nav { display: flex; align-items: center; gap: 0.85rem; font-size: 0.8rem; color: var(--ink-soft); flex-wrap: wrap; }
nav a { color: inherit; min-height: 2.75rem; display: inline-flex; align-items: center; }
nav a:hover { color: var(--ink); text-decoration: none; }
main { max-width: var(--max); width: 100%; margin: 0 auto; padding: clamp(2rem, 4vw, 3rem) clamp(1.25rem, 4vw, 2.5rem); }
.label {
  font-family: ui-monospace, monospace; font-size: 0.72rem; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--ink-faint); margin-bottom: 0.85rem;
}
h1 { font-size: clamp(1.75rem, 4vw, 2.4rem); font-weight: 600; letter-spacing: -0.03em; line-height: 1.15; margin-bottom: 1rem; max-width: 28ch; }
h2 { font-size: 1.1rem; font-weight: 600; margin: 1.75rem 0 0.65rem; letter-spacing: -0.02em; }
p, li { color: var(--ink-soft); margin-bottom: 0.75rem; max-width: 72ch; }
ul, ol { margin: 0.5rem 0 1rem 1.25rem; }
.topic-links { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1.25rem 0 2rem; }
.topic-links a {
  font-family: ui-monospace, monospace; font-size: 0.72rem; letter-spacing: 0.03em;
  text-transform: uppercase; padding: 0.4rem 0.6rem; border: 1px solid var(--line); background: #fff;
  color: var(--ink-soft);
}
.topic-links a:hover { color: var(--ink); text-decoration: none; }
.topic-links a.active { border-color: var(--accent); color: var(--accent); }
.btn-mcp {
  display: inline-flex; align-items: center; justify-content: center; min-height: 2.75rem;
  padding: 0.55rem 1rem; background: var(--ink); color: var(--paper); font-size: 0.85rem;
  font-weight: 500; margin-top: 0.5rem;
}
.btn-mcp:hover { background: var(--accent-hover); color: var(--paper); text-decoration: none; }
.cta { margin-top: 2rem; padding: 1.25rem; background: #fff; border: 1px solid var(--line); max-width: 72ch; }
footer {
  display: flex; justify-content: space-between; padding: 1rem clamp(1.25rem, 4vw, 2.5rem);
  font-size: 0.78rem; color: var(--ink-faint); border-top: 1px solid var(--line); flex-wrap: wrap; gap: 0.5rem;
}