:root {
  --text: #18181b;
  --muted: #71717a;
  --border: #e4e4e7;
  --bg: #ffffff;
  --ai:       #7c3aed;
  --scale:    #2563eb;
  --core:     #d97706;
  --projects: #0f766e;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  line-height: 1.6;
  max-width: 580px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── HEADER ── */
header {
  padding: 3.5rem 0 0;
}
.site-name {
  font-family: 'EB Garamond', serif;
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  display: block;
  margin-bottom: 0.2rem;
}
.site-tagline {
  font-size: 0.83rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

/* ── NAV ── */
nav {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
}
nav a {
  font-size: 0.8rem;
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 0.9rem 0.6rem;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  white-space: nowrap;
  transition: color 0.15s;
}
nav a:first-child { padding-left: 0; }
nav a:hover { color: var(--text); }

nav a.active                      { color: var(--text);     border-bottom-color: var(--text); }
nav a[data-cat="ai"].active       { color: var(--ai);       border-bottom-color: var(--ai); }
nav a[data-cat="scale"].active    { color: var(--scale);    border-bottom-color: var(--scale); }
nav a[data-cat="core"].active     { color: var(--core);     border-bottom-color: var(--core); }
nav a[data-cat="projects"].active { color: var(--projects); border-bottom-color: var(--projects); }

/* ── CATEGORY DESCRIPTION ── */
.cat-desc {
  min-height: 2.8rem;
  padding: 0.7rem 0 0.9rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.5;
}

/* ── POST LIST ── */
.post-list { padding-top: 0.5rem; }

.post-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
}
.post-row:hover .post-row-title {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.post-row-title {
  font-family: 'EB Garamond', serif;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--text);
}
.post-row-tag {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  white-space: nowrap;
}
.post-row-tag.ai       { color: var(--ai); }
.post-row-tag.systems  { color: var(--scale); }
.post-row-tag.code     { color: var(--core); }
.post-row-tag.projects { color: var(--projects); }

/* ── POST PAGE HEADER ── */
.post-header {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--border);
}
.post-cat {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.75rem;
}
.post-cat.ai       { color: var(--ai); }
.post-cat.systems  { color: var(--scale); }
.post-cat.code     { color: var(--core); }
.post-cat.projects { color: var(--projects); }

.post-title {
  font-family: 'EB Garamond', serif;
  font-size: 2rem;
  font-weight: 500;
  line-height: 1.25;
  color: var(--text);
  margin-bottom: 1rem;
}
.post-subtitle {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ── POST BODY ── */
.post-body {
  padding: 2.5rem 0;
}
.post-body p {
  font-family: 'EB Garamond', serif;
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--text);
  margin-bottom: 1.5rem;
}
.post-body h2 {
  font-family: 'EB Garamond', serif;
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--text);
  margin: 2.5rem 0 0.75rem;
  line-height: 1.3;
}
.post-body h3 {
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text);
  margin: 2rem 0 0.5rem;
}
.post-body ul,
.post-body ol {
  font-family: 'EB Garamond', serif;
  font-size: 1.15rem;
  line-height: 1.8;
  padding-left: 1.4rem;
  margin-bottom: 1.5rem;
}
.post-body li { margin-bottom: 0.3rem; }
.post-body blockquote {
  border-left: 2px solid var(--border);
  padding: 0.25rem 0 0.25rem 1.25rem;
  margin: 1.75rem 0;
}
.post-body blockquote p {
  font-style: italic;
  color: var(--muted);
}
.post-body pre {
  background: #f4f4f5;
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.82rem;
  line-height: 1.6;
  font-family: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;
}
.post-body code {
  font-family: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;
  font-size: 0.85em;
  background: #f4f4f5;
  padding: 0.15em 0.35em;
  border-radius: 3px;
}
.post-body pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}
.post-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

/* ── FURTHER READING ── */
.further-reading {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
}
.further-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}
.further-link {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
}
.further-link:last-child { border-bottom: none; }
.further-link:hover .further-link-title {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.further-link-title {
  font-family: 'EB Garamond', serif;
  font-size: 1rem;
  color: var(--text);
}
.further-link-tag {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  white-space: nowrap;
}
.further-link-tag.ai       { color: var(--ai); }
.further-link-tag.systems  { color: var(--scale); }
.further-link-tag.code     { color: var(--core); }
.further-link-tag.projects { color: var(--projects); }

/* ── ABOUT PAGE ── */
.about-body {
  padding: 2.5rem 0;
}
.about-body p {
  font-family: 'EB Garamond', serif;
  font-size: 1.15rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

/* ── FOOTER ── */
footer {
  padding: 1.5rem 0 3rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border);
  margin-top: 1rem;
}
footer span { font-size: 0.75rem; color: var(--muted); }
footer a {
  font-size: 0.75rem;
  color: var(--muted);
  text-decoration: none;
}
footer a:hover { color: var(--text); }

/* ── MAIN WRAPPER ── */
main { padding-bottom: 2rem; }