:root {
  --fg: #1a1a1a;
  --muted: #6b7280;
  --accent: #d97706;
  --border: #e5e7eb;
  --bg: #ffffff;
  --code-bg: #f4f4f5;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
}

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
}

.site-title {
  font-weight: 700;
  text-decoration: none;
  color: var(--fg);
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.layout {
  display: flex;
  align-items: flex-start;
  max-width: 1200px;
  margin: 0 auto;
  gap: 2rem;
  padding: 0 1.5rem;
}

.toc {
  flex: 0 0 240px;
  position: sticky;
  top: 0;
  max-height: 100vh;
  overflow-y: auto;
  padding: 2.5rem 0 2rem;
  font-size: 0.88rem;
  border-right: 1px solid var(--border);
}

.toc-inner { padding-right: 1rem; }

.toc-title {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc li { margin: 0.2rem 0; }

.toc a {
  color: var(--fg);
  text-decoration: none;
  display: block;
  padding: 0.15rem 0;
  line-height: 1.35;
}

.toc a:hover { color: var(--accent); text-decoration: none; }

.toc ul ul {
  padding-left: 0.9rem;
  margin-top: 0.1rem;
  border-left: 1px solid var(--border);
}

.toc ul ul a { color: var(--muted); font-size: 0.85rem; }

.content {
  flex: 1 1 auto;
  min-width: 0;
  max-width: 820px;
  padding: 2.5rem 0 4rem;
}

.site-footer {
  margin-top: 3rem;
  padding-top: 1rem;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

@media (max-width: 900px) {
  .layout { flex-direction: column; gap: 0; padding: 0 1rem; }
  .toc {
    position: static;
    max-height: none;
    padding: 1.5rem 0 0.5rem;
    border-right: 0;
    border-bottom: 1px solid var(--border);
    width: 100%;
  }
  .toc-inner { padding-right: 0; }
  .content { padding: 1.5rem 0 3rem; }
}

h1, h2, h3, h4 {
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin-top: 2.25rem;
  margin-bottom: 0.75rem;
}

h1 { font-size: 2rem; margin-top: 0; }
h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.35rem; }
h3 { font-size: 1.15rem; }

a { color: var(--accent); }
a:hover { text-decoration: underline; }

p, ul, ol { margin: 0.75rem 0; }

code {
  background: var(--code-bg);
  padding: 0.15em 0.35em;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
}

pre code { background: transparent; padding: 0; }

table {
  border-collapse: collapse;
  margin: 1rem 0;
  width: 100%;
  font-size: 0.92rem;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--code-bg);
  font-weight: 600;
}

blockquote {
  border-left: 3px solid var(--accent);
  margin: 1rem 0;
  padding: 0.5rem 1rem;
  color: var(--muted);
  background: #fff9ed;
}

hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }

.doc-list { list-style: none; padding: 0; }
.doc-list li {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
}
.doc-list li a { font-size: 1.1rem; font-weight: 600; text-decoration: none; }
.doc-list li p { margin: 0.25rem 0 0; color: var(--muted); font-size: 0.9rem; }