:root {
  --bg: #F7F9FA;
  --surface: #FFFFFF;
  --text: #0E1F26;
  --accent: #137A7F;
  --accent-dim: #4FA9AD;
  --muted: #5A6B73;
  --line: #DDE6E8;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 "Inter", "Geist", system-ui, sans-serif;
}
.container { max-width: 920px; margin: 0 auto; padding: 0 1.5rem; }
header.site { background: var(--surface); border-bottom: 1px solid var(--line); padding: 1.25rem 0; position: sticky; top: 0; z-index: 10; }
header.site .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.brand { color: var(--text); text-decoration: none; font-weight: 700; font-size: 1.1rem; letter-spacing: -0.01em; display: flex; align-items: center; gap: 0.5rem; }
.brand .dot { width: 10px; height: 10px; background: var(--accent); border-radius: 2px; display: inline-block; }
nav.site a { color: var(--muted); text-decoration: none; margin-left: 1.5rem; font-size: 0.92rem; font-weight: 500; }
nav.site a:hover { color: var(--accent); }
main { padding: 2.5rem 0 4rem; }
.hero { margin: 0 0 2.5rem; }
.hero h1 { font-size: 1.5rem; font-weight: 700; margin: 0 0 0.5rem; letter-spacing: -0.01em; }
.hero p { color: var(--muted); margin: 0; font-size: 1rem; max-width: 600px; }
article header { margin: 0 0 2rem; }
article h1 { font-size: 1.8rem; line-height: 1.2; margin: 0 0 0.75rem; font-weight: 700; letter-spacing: -0.01em; }
article .meta { color: var(--muted); font-size: 0.9rem; margin: 0; }
article h2 { font-size: 1.2rem; margin: 2rem 0 0.75rem; font-weight: 700; }
article p { margin: 1rem 0; }
article a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-dim); }
article a:hover { border-bottom-color: var(--accent); }
article ul, article ol { margin: 1rem 0; padding-left: 1.5rem; }
article li { margin: 0.4rem 0; }
article blockquote { border-left: 3px solid var(--accent); margin: 1.5rem 0; padding: 0.25rem 1rem; color: var(--muted); font-size: 0.98rem; }
.post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; margin: 0; padding: 0; list-style: none; }
.post-grid li { background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 1.25rem; transition: border-color 0.15s, box-shadow 0.15s; }
.post-grid li:hover { border-color: var(--accent-dim); box-shadow: 0 1px 4px rgba(19, 122, 127, 0.08); }
.post-grid h2 { font-size: 1.05rem; margin: 0 0 0.4rem; font-weight: 700; line-height: 1.3; }
.post-grid h2 a { color: var(--text); text-decoration: none; border: none; }
.post-grid h2 a:hover { color: var(--accent); }
.post-grid .meta { color: var(--muted); font-size: 0.82rem; margin: 0 0 0.5rem; }
.post-grid .excerpt { margin: 0; font-size: 0.92rem; color: var(--text); }
footer.site { border-top: 1px solid var(--line); padding: 1.75rem 0; color: var(--muted); font-size: 0.85rem; background: var(--surface); margin-top: 3rem; }
footer.site .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }
footer.site a { color: var(--accent); }
@media (max-width: 600px) {
  article h1 { font-size: 1.5rem; }
  .hero h1 { font-size: 1.3rem; }
  nav.site a { margin-left: 1rem; }
}