:root {
  --bg: #f3f4f6;
  --panel: #ffffff;
  --text: #222222;
  --muted: #666666;
  --border: #d7d7d7;
  --accent: #245f99;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.62;
  color: var(--text);
  background: var(--bg);
}
.site-header {
  background: #20242a;
  color: #fff;
  padding: 22px 16px;
  border-bottom: 4px solid #111;
}
.site-header .wrap,
.page {
  max-width: 1120px;
  margin: 0 auto;
}
.site-header h1 {
  margin: 0;
  font-size: 2rem;
  line-height: 1.2;
}
.site-header p {
  margin: 6px 0 0;
  color: #d7d7d7;
}
.page {
  display: grid;
  grid-template-columns: 245px minmax(0, 1fr);
  gap: 24px;
  padding: 24px 16px 40px;
}
.toc {
  align-self: start;
  position: sticky;
  top: 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}
.toc h2 {
  font-size: 1rem;
  margin: 0 0 10px;
}
.toc a {
  display: block;
  color: var(--accent);
  text-decoration: none;
  padding: 5px 0;
  border-top: 1px solid #eee;
}
.toc a:hover { text-decoration: underline; }
.content {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
}
.hero {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  margin-bottom: 20px;
}
.cover {
  width: 150px;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px;
  background: #fff;
}
.meta p { margin: 0 0 8px; }
.intro {
  background: #f8fafc;
  border-left: 4px solid var(--accent);
  padding: 14px 16px;
  margin: 20px 0 28px;
}
h2 {
  margin-top: 32px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--border);
  color: #111;
}
h2:first-child { margin-top: 0; }
h3 {
  margin-top: 22px;
  color: #333;
}
p { margin: 0 0 14px; }
a { color: var(--accent); }
hr { border: none; border-top: 1px solid var(--border); margin: 24px 0; }
.local-note {
  margin-top: 30px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}
@media (max-width: 800px) {
  .page { grid-template-columns: 1fr; }
  .toc { position: static; }
  .hero { grid-template-columns: 1fr; }
}
@media print {
  .toc, .site-header p, .local-note { display: none; }
  .page { display: block; padding: 0; }
  .content { border: 0; padding: 0; }
  body { background: #fff; }
}