* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 17px;
  line-height: 1.7;
  color: #222;
  background: #fff;
  padding: 2rem 1rem;
}

.content {
  max-width: 720px;
  margin: 0 auto;
}

/* ── Breadcrumb ── */
nav.breadcrumb {
  font-size: 0.82rem;
  margin-bottom: 2rem;
  color: #888;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

nav.breadcrumb a {
  color: #666;
  text-decoration: none;
}

nav.breadcrumb a:hover {
  text-decoration: underline;
  color: #333;
}

nav.breadcrumb .sep {
  margin: 0 0.45em;
  color: #bbb;
}

/* ── Headings ── */
h1 {
  font-size: 1.75rem;
  font-weight: bold;
  margin-bottom: 0.4rem;
  line-height: 1.25;
}

h2 {
  font-size: 1.25rem;
  font-weight: bold;
  margin-top: 2.25rem;
  margin-bottom: 0.5rem;
}

h3 {
  font-size: 1.05rem;
  font-weight: bold;
  margin-top: 1.75rem;
  margin-bottom: 0.35rem;
}

/* ── Site intro (index) ── */
.site-title {
  margin-bottom: 0.25rem;
}

.site-subtitle {
  font-size: 0.88rem;
  color: #888;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  margin-bottom: 1.5rem;
}

.site-intro {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid #e8e8e8;
}

.site-intro p {
  margin-bottom: 0.9rem;
  color: #333;
}

/* ── Cluster cards ── */
.section-heading {
  font-size: 0.8rem;
  font-weight: bold;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #999;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  margin-bottom: 1.25rem;
}

.clusters {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.cluster-card {
  border: 1px solid #ddd;
  border-radius: 3px;
  padding: 1.1rem 1.4rem;
}

.cluster-card h2 {
  margin-top: 0;
  font-size: 1.05rem;
}

.cluster-card .cluster-label {
  font-size: 0.76rem;
  color: #aaa;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  margin-bottom: 0.4rem;
}

.cluster-card p {
  font-size: 0.88rem;
  color: #555;
  margin-top: 0.5rem;
  margin-bottom: 0.85rem;
  line-height: 1.55;
}

.cluster-card a.cluster-link {
  font-size: 0.83rem;
  color: #555;
  text-decoration: none;
  border-bottom: 1px solid #ccc;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.cluster-card a.cluster-link:hover {
  color: #111;
  border-color: #888;
}

/* ── Reader profiles ── */
.profiles-section {
  border-top: 1px solid #e8e8e8;
  padding-top: 2rem;
  margin-bottom: 3rem;
}

.profile {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid #f0f0f0;
}

.profile:last-child {
  border-bottom: none;
}

.profile h3 {
  margin-top: 0;
  font-size: 1rem;
}

.profile p {
  font-size: 0.88rem;
  color: #555;
  margin-top: 0.4rem;
  margin-bottom: 0.6rem;
  line-height: 1.6;
}

.profile .start-links {
  font-size: 0.82rem;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.profile .start-links a {
  color: #555;
  text-decoration: none;
  border-bottom: 1px solid #ddd;
}

.profile .start-links a:hover {
  color: #111;
  border-color: #888;
}

/* ── Cluster page ── */
.cluster-description {
  margin-bottom: 2rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid #e8e8e8;
}

.cluster-description p {
  margin-bottom: 0.85rem;
  color: #333;
}

.cluster-subtitle {
  font-size: 0.82rem;
  color: #aaa;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  margin-bottom: 0.35rem;
}

/* ── Essay list ── */
.essay-list {
  list-style: none;
  margin: 0 0 2rem 0;
}

.essay-list li {
  margin-bottom: 0.6rem;
  padding: 0.65rem 0.8rem;
  border-left: 3px solid #eee;
  transition: border-color 0.15s;
}

.essay-list li.key {
  border-left-color: #aaa;
}

.essay-list li:hover {
  border-left-color: #999;
}

.essay-list .essay-num {
  font-size: 0.72rem;
  color: #bbb;
  font-family: monospace;
  margin-right: 0.4rem;
}

.essay-list a {
  color: #222;
  text-decoration: none;
  font-size: 0.95rem;
}

.essay-list a:hover {
  text-decoration: underline;
}

.essay-list .key-claim {
  display: block;
  font-size: 0.81rem;
  color: #777;
  margin-top: 0.2rem;
  line-height: 1.5;
}

/* ── Essay page ── */
.essay-id {
  font-size: 0.78rem;
  color: #bbb;
  font-family: monospace;
  margin-bottom: 0.2rem;
}

.essay-date {
  font-size: 0.8rem;
  color: #aaa;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  margin-bottom: 1.25rem;
}

.essay-key-claim {
  background: #f8f8f8;
  border-left: 3px solid #ccc;
  padding: 0.8rem 1.1rem;
  margin-bottom: 2.25rem;
  font-size: 0.9rem;
  color: #444;
  line-height: 1.6;
}

.essay-body {
  margin-bottom: 3rem;
}

.essay-body h1 {
  font-size: 1.4rem;
  margin-top: 2.25rem;
  margin-bottom: 0.5rem;
}

.essay-body h2 {
  font-size: 1.2rem;
  margin-top: 2rem;
  margin-bottom: 0.45rem;
}

.essay-body h3 {
  margin-top: 1.75rem;
  margin-bottom: 0.35rem;
}

.essay-body p {
  margin-bottom: 1rem;
}

.essay-body ul,
.essay-body ol {
  margin: 0.5rem 0 1rem 1.6rem;
}

.essay-body li {
  margin-bottom: 0.3rem;
}

.essay-body blockquote {
  border-left: 3px solid #ddd;
  padding-left: 1rem;
  color: #555;
  margin: 1.25rem 0;
  font-style: italic;
}

.essay-body hr {
  border: none;
  border-top: 1px solid #e8e8e8;
  margin: 2rem 0;
}

.essay-body a {
  color: #444;
}

.essay-body code {
  font-family: monospace;
  background: #f5f5f5;
  padding: 0.1em 0.3em;
  border-radius: 2px;
  font-size: 0.88em;
}

.essay-body pre {
  background: #f5f5f5;
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.85em;
  margin: 1rem 0;
}

/* ── Cross-links ── */
.cross-links {
  border-top: 1px solid #e8e8e8;
  padding-top: 1.5rem;
  margin-top: 2rem;
}

.cross-links h2 {
  margin-top: 0;
  font-size: 0.95rem;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #888;
  margin-bottom: 0.75rem;
}

.cross-links ul {
  list-style: none;
  margin: 0;
}

.cross-links li {
  margin-bottom: 0.45rem;
  font-size: 0.88rem;
}

.cross-links a {
  color: #555;
  text-decoration: none;
}

.cross-links a:hover {
  text-decoration: underline;
  color: #111;
}

.cross-links .ref-key {
  font-family: monospace;
  font-size: 0.76rem;
  color: #bbb;
  margin-right: 0.3rem;
}

/* ── Related essays ── */
.related-essays {
    margin-top: 2em;
    padding-top: 1em;
    border-top: 1px solid #ddd;
}
.related-essays h2 { font-size: 1.1em; color: #555; margin-bottom: 0.5em; }
.related-essays ul { list-style: none; padding: 0; margin: 0; }
.related-essays li { margin: 0.3em 0; }

/* ── Sequential navigation ── */
.seq-nav {
    margin-top: 2em;
    padding-top: 1em;
    border-top: 1px solid #ddd;
    font-size: 0.9em;
    color: #555;
}
.seq-nav .seq-label { font-weight: bold; }
.seq-nav .seq-prev a, .seq-nav .seq-next a { color: #2a5db0; text-decoration: none; }
.seq-nav .seq-prev a:hover, .seq-nav .seq-next a:hover { text-decoration: underline; }

/* ── Cited-by ── */
.cited-by {
  border-top: 1px solid #e8e8e8;
  padding-top: 1.5rem;
  margin-top: 1.5rem;
}

.cited-by h2 {
  margin-top: 0;
  font-size: 0.95rem;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #888;
  margin-bottom: 0.75rem;
}

.cited-by ul {
  list-style: none;
  margin: 0;
}

.cited-by li {
  margin-bottom: 0.45rem;
  font-size: 0.88rem;
}

.cited-by a {
  color: #555;
  text-decoration: none;
}

.cited-by a:hover {
  text-decoration: underline;
  color: #111;
}

/* ── Reader tags ── */
.essay-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.75rem;
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f2f2f2;
  color: #666;
  padding: 0.2em 0.6em;
  border-radius: 3px;
  letter-spacing: 0.02em;
}

/* ── Footer ── */
footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e8e8e8;
  font-size: 0.78rem;
  color: #bbb;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ── Search results ── */
.essay-card { border-bottom: 1px solid #ddd; padding: 1em 0; }
.essay-card:last-child { border-bottom: none; }
.essay-card .essay-num { font-size: 0.8em; color: #888; font-family: monospace; }
.essay-card h3 { margin: 0.2em 0; }
.essay-card p { margin: 0.3em 0; font-size: 0.95em; }
.tag-pills { margin-top: 0.4em; }
.pill {
  display: inline-block;
  font-size: 0.75rem;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f2f2f2;
  color: #666;
  padding: 0.2em 0.6em;
  border-radius: 3px;
  letter-spacing: 0.02em;
  margin-right: 0.2em;
}