:root {
  --text: #111;
  --muted: #606060;
  --line: #d9d9d9;
  --soft: #f7f7f7;
  --bg: #fff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.62;
}
a { color: #111; }
a:hover { text-decoration-thickness: 2px; }
.site-header, .site-footer, main {
  max-width: 1080px;
  margin: 0 auto;
}
.site-header {
  padding: 28px 24px 12px;
  border-bottom: 1px solid var(--line);
}
.branding h1 {
  margin: 0;
  font-size: 2.15rem;
  font-weight: 600;
  letter-spacing: .02em;
}
.branding .subtitle {
  margin: 6px 0 0;
  font-size: 1.24rem;  
  color: var(--muted);
}
.main-nav {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}
.main-nav a, .subnav a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.main-nav a.active, .main-nav a:hover,
.subnav a.active, .subnav a:hover { border-color: #111;}
main { padding: 0px 24px 58px; }
.page-head { margin-bottom: 24px; }
.page-head h2 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
}
.page-head p {
  margin: 6px 0 0;
  color: var(--muted);
}
.subnav {
  margin: 0 0 34px;
  padding: 12px 0 4px;
  border-top: 0px solid var(--line);
  border-bottom: 0px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  color: var(--muted);
}
.subnav span { color: var(--muted); }
section { margin: 0 0 42px; }
section:last-child { margin-bottom: 0; }
section h3 {
  margin: 0 0 14px;
  font-size: 1.25rem;
}
main p { margin: 0 0 1rem; }
.lede {
  font-size: 1.08rem;
}
.blockquote-like {
  border-left: 2px solid #111;
  padding-left: 16px;
  margin: 22px 0;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
  margin-top: 24px;
}
.card {
  display: block;
  border: 1px solid var(--line);
  padding: 18px 18px 16px;
  text-decoration: none;
  min-height: 130px;
}
.card:hover { background: var(--soft); }
.card strong { display: block; margin-bottom: 8px; }
.card span { color: var(--muted); }
.content-grid, .book-grid, .author-grid {
  display: grid;
  gap: 36px;
  align-items: start;
}
.content-grid { grid-template-columns: 1.3fr 1fr; }
.book-grid { grid-template-columns: 280px 1fr; }
.author-grid { grid-template-columns: 600px 1fr; }
.image-box { margin: 0; }
.image-box img { max-width: 90%; height: auto; display: block; }
.image-box figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: .92rem;
}
.signature { margin-top: 14px; max-width: 220px; }
.visual-centered { margin: 26px 0 30px; text-align: center; }
.visual-centered img {
  max-width: 100%;
  width: 760px;
  height: auto;
  border: 1px solid var(--line);
}
.definition {
  border-top: 1px solid var(--line);
  padding-top: 18px;
  margin-top: 22px;
}
.definition h3 { margin-bottom: 6px; }
.definition .tagline { color: var(--muted); margin-bottom: 12px; }
.next-links {
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}
ul.clean { padding-left: 18px; margin: 0 0 1rem; }
ul.clean li { margin-bottom: 8px; }
.site-footer {
  border-top: 1px solid var(--line);
  padding: 22px 24px 36px;
  color: var(--muted);
}
.site-footer p { margin: 0 0 10px; }
.footer-links a { color: var(--muted); margin-right: 16px; }
.small-note { color: var(--muted); font-size: .92rem; }
@media (max-width: 840px) {
  .content-grid, .book-grid, .author-grid { grid-template-columns: 1fr; }
  .visual-centered img { width: 100%; }
  .site-header, main, .site-footer { padding-left: 18px; padding-right: 18px; }
}