/* Heuron Technology — shared styles for /blog
   Design system mirrors index.html: sand ground, forest accent,
   Playfair Display / Instrument Sans / JetBrains Mono. */

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

:root {
  --bg:         #e8e3db;
  --surface:    #dfd9d0;
  --border:     #c9c3b8;
  --text:       #1a1814;
  --muted:      #7a7368;
  --accent:     #2d4a3e;
  --accent-mid: #4a7a68;
  --accent-lit: #6ba892;
  --warm:       #8b6f4e;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Instrument Sans', sans-serif;
  font-weight: 300;
  font-size: 19px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 740px; margin: 0 auto; padding: 0 2rem; }

/* ── Nav (matches homepage) ── */
nav { padding: 2.2rem 0; }
nav .container {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.wordmark {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 300; font-size: 0.78rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent);
  text-decoration: none;
}
.nav-links { display: flex; gap: 1.4rem; }
.nav-link {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted); text-decoration: none; transition: color 0.2s;
}
.nav-link:hover { color: var(--text); }

/* ── Article header ── */
.article-head {
  padding: 4rem 0 2.6rem;
  border-top: 1px solid var(--border);
}
.eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent-mid); margin-bottom: 2rem;
}
h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2.3rem, 5.2vw, 3.3rem);
  font-weight: 400; line-height: 1.14; letter-spacing: -0.015em;
  color: var(--text); margin-bottom: 1.6rem;
}
.standfirst {
  font-family: 'Playfair Display', serif;
  font-style: italic;
  font-size: 1.28rem; line-height: 1.5;
  color: var(--accent); max-width: 34ch;
  margin-bottom: 2rem;
}
.byline {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted);
  padding-top: 1rem; border-top: 1px solid var(--border);
}

/* ── Article body ── */
article { padding-bottom: 1rem; }
article section { padding: 2.8rem 0 0; }
article h2 {
  font-family: 'Playfair Display', serif;
  font-size: 1.62rem; font-weight: 400; line-height: 1.25;
  color: var(--text); margin-bottom: 1.2rem;
}
article p { color: var(--muted); margin-bottom: 1.15rem; }
article p:last-child { margin-bottom: 0; }
article strong { color: var(--text); font-weight: 400; }
article em { font-style: italic; }
article a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-lit); }
article a:hover { color: var(--text); border-color: var(--text); }

article code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82em;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.08em 0.34em;
  border-radius: 2px;
  color: var(--text);
}

/* ── Code blocks ── */
article pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent-lit);
  padding: 1.2rem 1.3rem;
  margin: 1.6rem 0;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--text);
}
article pre code {
  background: none; border: 0; padding: 0; font-size: inherit; color: inherit;
}
article .caption {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent-mid); margin: -0.9rem 0 1.6rem;
}

/* ── Principle callout ── */
.principle {
  font-family: 'Playfair Display', serif;
  font-size: 1.3rem; line-height: 1.45; font-style: italic;
  color: var(--accent);
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent);
  padding: 1.5rem 1.7rem;
  margin: 1.8rem 0;
}

/* ── Pull quote (matches homepage treatment) ── */
article blockquote {
  font-family: 'Playfair Display', serif;
  font-style: italic;
  font-size: clamp(1.2rem, 2.8vw, 1.55rem);
  line-height: 1.5;
  color: var(--accent);
  max-width: 600px;
  padding-left: 1.8rem;
  border-left: 2px solid var(--accent-lit);
  margin: 2rem 0;
}

/* ── Field notes ── */
.note {
  padding: 1.6rem 0 0;
  border-top: 1px solid var(--border);
  margin-top: 1.6rem;
}
.note-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem; letter-spacing: 0.13em; text-transform: uppercase;
  color: var(--accent-mid); margin-bottom: 0.9rem;
}
.note p { font-size: 0.97rem; line-height: 1.75; }

.kicker { color: var(--text); font-weight: 400; }

hr.brk { border: 0; height: 1px; background: var(--border); margin: 3rem 0 0; }

/* ── Author box ── */
.authorbox {
  margin-top: 3.5rem;
  padding: 2rem 2rem 1.8rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent);
}
.ab-name {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 1rem;
}
.authorbox p.ab-body {
  font-size: 0.95rem; line-height: 1.7; color: var(--muted);
  margin-bottom: 0.9rem;
}
.authorbox p.ab-body strong { color: var(--text); font-weight: 400; }
.authorbox a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-lit); }
.authorbox a:hover { color: var(--text); border-color: var(--text); }
.ab-links {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem; letter-spacing: 0.04em;
  color: var(--muted);
  padding-top: 0.9rem; border-top: 1px solid var(--border);
  margin-top: 0.4rem;
  display: flex; flex-wrap: wrap; gap: 0.4rem 1rem;
}

.colophon {
  margin-top: 2rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem; line-height: 1.7; color: var(--muted);
  padding-top: 1.4rem; border-top: 1px solid var(--border);
}

/* ── Index listing ── */
.writing-item {
  display: block; padding: 1.6rem 0;
  border-top: 1px solid var(--border);
  text-decoration: none; transition: opacity 0.2s;
}
.writing-item:last-of-type { border-bottom: 1px solid var(--border); }
.writing-item:hover { opacity: 0.65; }
.writing-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.25rem; color: var(--text); margin-bottom: 0.35rem; line-height: 1.3;
}
.writing-dek { font-size: 0.93rem; color: var(--muted); margin-bottom: 0.5rem; line-height: 1.6; }
.writing-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent-mid);
}

/* ── Footer ── */
footer { padding: 3rem 0 2.5rem; margin-top: 2rem; }
footer .container {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem;
  border-top: 1px solid var(--border); padding-top: 1.6rem;
}
.footer-copy {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem; letter-spacing: 0.06em; color: var(--muted);
}
.footer-copy a { color: var(--muted); text-decoration: none; }
.footer-copy a:hover { color: var(--text); }

@media (max-width: 560px) {
  body { font-size: 18px; }
  .authorbox { padding: 1.5rem 1.4rem; }
}