:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --muted: #898781;
  --accent: #2a78d6;
  --border: rgba(11,11,11,0.10);
  --gridline: #e1e0d9;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --text-primary: #ffffff;
    --text-secondary: #c3c2b7;
    --muted: #898781;
    --accent: #3987e5;
    --border: rgba(255,255,255,0.10);
    --gridline: #2c2c2a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--page);
  color: var(--text-primary);
  line-height: 1.6;
}
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.site-header-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 18px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo { font-weight: 700; font-size: 1.1rem; color: var(--text-primary); text-decoration: none; }
.tagline { font-size: 0.8rem; color: var(--muted); }
main { max-width: 760px; margin: 0 auto; padding: 40px 20px 80px; }
h1 { font-size: 1.9rem; margin: 0 0 8px; }
h2 { font-size: 1.3rem; margin: 32px 0 12px; }
p { margin: 0 0 16px; color: var(--text-secondary); }
.hero p { font-size: 1.05rem; }
ul, ol { color: var(--text-secondary); padding-left: 22px; }
li { margin-bottom: 8px; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
  margin: 20px 0;
}
.article-list { list-style: none; padding: 0; }
.article-list li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  margin-bottom: 12px;
}
.article-list a { color: var(--text-primary); text-decoration: none; font-weight: 600; }
.article-list a:hover { color: var(--accent); }
.article-list .excerpt { font-size: 0.88rem; color: var(--text-secondary); margin-top: 6px; }
.back-link { display: inline-block; margin-bottom: 20px; color: var(--accent); text-decoration: none; font-size: 0.88rem; }
footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  padding: 30px 20px;
  border-top: 1px solid var(--border);
}
.note-box {
  border-left: 3px solid var(--accent);
  background: var(--surface);
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin: 20px 0;
}