:root {
  --bg: #faf6f0;
  --surface: #ffffff;
  --border: #ede4d5;
  --text: #3d2b1f;
  --muted: #8b7560;
  --accent: #c2452d;
  --action: #1a5c4c;
  --tertiary: #c4a67d;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent); }
a:hover { background: var(--accent); color: var(--bg); }

.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: 100vh;
}

aside.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 28px 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-brand {
  font-family: Georgia, serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  border-bottom: none;
  display: block;
  margin-bottom: 4px;
}
.sidebar-brand:hover { background: transparent; color: var(--accent); }

.sidebar-sub {
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 24px;
  display: block;
}

.sidebar-section {
  margin-bottom: 22px;
}

.sidebar-section-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
  padding-left: 8px;
}

.sidebar-link {
  display: block;
  font-size: 0.88rem;
  color: var(--text);
  border-bottom: none;
  padding: 5px 8px;
  border-radius: 3px;
  line-height: 1.35;
  margin-bottom: 1px;
}
.sidebar-link:hover { background: var(--bg); color: var(--accent); padding: 5px 8px; }
.sidebar-link.active { background: var(--bg); color: var(--accent); font-weight: 600; }
.sidebar-link.back {
  font-size: 0.82rem;
  color: var(--accent);
  margin-top: 28px;
  border-top: 1px solid var(--border);
  padding-top: 18px;
}

main.content {
  padding: 56px 72px;
  max-width: 920px;
}

main.content h1 {
  font-family: Georgia, serif;
  font-weight: normal;
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.15;
  margin: 0 0 0.5em 0;
  color: var(--text);
  letter-spacing: -0.015em;
}

main.content h2 {
  font-family: Georgia, serif;
  font-weight: normal;
  font-size: 1.6rem;
  line-height: 1.2;
  margin: 1.6em 0 0.5em 0;
  color: var(--text);
  letter-spacing: -0.01em;
  border-top: 1px solid var(--border);
  padding-top: 24px;
}

main.content h3 {
  font-family: Georgia, serif;
  font-weight: 600;
  font-size: 1.2rem;
  margin: 1.4em 0 0.4em 0;
  color: var(--text);
}

main.content h4 {
  font-family: Georgia, serif;
  font-weight: 700;
  font-size: 1.0rem;
  margin: 1.2em 0 0.3em 0;
  color: var(--text);
}

main.content p {
  margin: 0 0 1em 0;
}

main.content ul, main.content ol {
  margin: 0 0 1em 0;
  padding-left: 24px;
}

main.content li {
  margin-bottom: 6px;
}

main.content blockquote {
  border-left: 4px solid var(--accent);
  padding: 4px 16px;
  margin: 1em 0;
  color: var(--muted);
  font-style: italic;
}

main.content code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--surface);
  padding: 1px 5px;
  border: 1px solid var(--border);
  border-radius: 3px;
}

main.content pre {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 16px;
  overflow-x: auto;
  font-size: 0.85em;
  border-radius: 3px;
}

main.content pre code {
  border: none;
  background: transparent;
  padding: 0;
}

main.content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
  font-size: 0.88em;
}

main.content th, main.content td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}

main.content th {
  background: var(--surface);
  font-weight: 700;
  font-size: 0.82em;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

main.content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}

main.content strong { font-weight: 700; }

main.content em { font-style: italic; }

.page-meta {
  font-size: 0.82rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.page-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  font-size: 0.92rem;
}

.page-nav a {
  border-bottom: none;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--surface);
}
.page-nav a:hover { background: var(--accent); color: var(--bg); border-color: var(--accent); }

.page-nav .next { margin-left: auto; }

@media (max-width: 880px) {
  .layout { grid-template-columns: 1fr; }
  aside.sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 20px;
  }
  main.content { padding: 32px 24px; max-width: 100%; }
  main.content table { font-size: 0.78em; }
  main.content th, main.content td { padding: 6px 8px; }
}