:root {
  --bg:      #000000;
  --text:    #ffffff;
  --muted:   #888888;
  --link:    #40e0d0; /* turquoise */
  --border:  #222222;
  --max-w:   680px;
  --font:    -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 18px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.65;
}

/* ── Links ── */
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout wrapper ── */
.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.2rem;
}

/* ── Header ── */
header {
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 0;
}
header .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.site-name {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--link);
}
nav a {
  font-size: 0.85rem;
  color: var(--muted);
  margin-left: 1.2rem;
}
nav a:hover { color: var(--text); text-decoration: none; }

/* ── Main content ── */
main { padding: 3rem 0; }

/* ── Post list (index) ── */
.post-list { list-style: none; }
.post-list li {
  border-bottom: 1px solid var(--border);
  padding: 1.8rem 0;
}
.post-list li:first-child { padding-top: 0; }
.post-meta {
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 0.4rem;
}
.post-list h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}
.post-list h2 a { color: var(--link); }
.post-list h2 a:hover { color: var(--text); text-decoration: none; }
.post-excerpt {
  font-size: 0.9rem;
  color: var(--muted);
}

/* ── Post page ── */
.post-header { margin-bottom: 2.5rem; }
.post-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.6rem;
}
.post-body { font-size: 1rem; }
.post-body p { margin-bottom: 1.2rem; }
.post-body h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 2rem 0 0.6rem;
}
.post-body blockquote {
  border-left: 2px solid var(--link);
  padding-left: 1rem;
  color: var(--muted);
  font-style: italic;
  margin: 1.5rem 0;
}
.post-body code {
  background: #111;
  padding: 0.1em 0.35em;
  border-radius: 3px;
  font-size: 0.85em;
}
.back { display: inline-block; margin-top: 2.5rem; font-size: 0.85rem; }

/* ── About page ── */
.about h1 { font-size: 1.4rem; margin-bottom: 1.5rem; }
.about p { margin-bottom: 1.2rem; color: var(--text); }

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

/* ── Mobile ── */
@media (max-width: 600px) {
  html { font-size: 16px; }
  .post-header h1 { font-size: 1.3rem; }
  footer .wrap { flex-direction: column; gap: 0.5rem; text-align: center; }
}