:root {
  --paper: #f4f1ea;
  --ink: #111;
  --mute: #5c5a56;
  --line: #d8d2c6;
  --gold: #b08d3a;
}

* { box-sizing: border-box; }
html { overflow-x: clip; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.7 "Inter", "Helvetica Neue", Arial, sans-serif;
  overflow-x: clip;
  overflow-wrap: anywhere;
}
img { max-width: 100%; height: auto; }
a { color: inherit; }

.lab-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 7vw;
  border-bottom: 1px solid var(--line);
  background: #fff;
}
.lab-brand {
  font: 600 13px/1 "Inter", sans-serif;
  letter-spacing: .18em;
  text-transform: uppercase;
  text-decoration: none;
}
.lab-brand i { font-style: normal; color: var(--gold); }
.lab-top nav { display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 13px; }
.lab-top nav a { color: var(--mute); text-decoration: none; }

.lab-wrap { width: min(740px, calc(100% - 40px)); margin: 0 auto; padding: 48px 0 72px; }
.lab-k {
  color: var(--gold);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
}
.lab-wrap h1 {
  font: 400 clamp(28px, 5vw, 44px)/1.15 "Libre Baskerville", Georgia, serif;
  margin: 12px 0 18px;
}
.lab-wrap h2 {
  font: 400 clamp(20px, 3vw, 26px)/1.25 "Libre Baskerville", Georgia, serif;
  margin: 40px 0 12px;
}
.lab-lead { color: var(--mute); font-size: 19px; }
.lab-chapters { margin: 28px 0; padding: 0; list-style: none; }
.lab-chapters li {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.lab-chapters b {
  font: 400 22px/1 "Libre Baskerville", Georgia, serif;
  color: var(--gold);
}

.lab-cta { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 12px; margin: 28px 0; }
.lab-cta a {
  display: block;
  text-align: center;
  text-decoration: none;
  padding: 13px 16px;
  font-size: 13px;
  letter-spacing: .06em;
  text-transform: uppercase;
  font-weight: 600;
}
.lab-cta .main { background: var(--ink); color: #fff; }
.lab-cta .alt { border: 1px solid var(--ink); }

.lab-figure { margin: 28px 0; }
.lab-figure figcaption { color: var(--mute); font-size: 13px; margin-top: 8px; }
.lab-table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 16px 0 8px; }
.lab-table th, .lab-table td { border-bottom: 1px solid var(--line); padding: 12px 8px; text-align: left; vertical-align: top; }
.lab-table th { font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--mute); font-weight: 600; }
.lab-scroll { overflow-x: auto; }

.lab-faq details { border-top: 1px solid var(--line); padding: 14px 0; }
.lab-faq summary { cursor: pointer; font-weight: 600; }
.lab-faq p { color: var(--mute); margin: 8px 0 0; }
.lab-ext { font-size: 15px; }
.lab-ext a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.lab-foot {
  padding: 22px 7vw;
  border-top: 1px solid var(--line);
  color: var(--mute);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  text-align: center;
  background: #fff;
}

@media (max-width: 720px) {
  .lab-top { flex-direction: column; text-align: center; padding: 14px 16px; }
  .lab-top nav { justify-content: center; }
  .lab-cta { grid-template-columns: 1fr; }
  .lab-wrap { padding: 28px 0 48px; }
  .lab-table thead { display: none; }
  .lab-table, .lab-table tbody, .lab-table tr, .lab-table td { display: block; width: 100%; }
  .lab-table tr { padding: 10px 0; }
  .lab-table td { border: 0; padding: 3px 0; }
  .lab-table td:first-child { font-weight: 700; }
}