:root {
  --brand: #0b3d91;
  --brand-hover: #0a347a;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #f8fafc;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}
.doc-header {
  background: linear-gradient(135deg, var(--brand) 0%, #12285e 100%);
  color: #fff;
  padding: 3rem 1.5rem 2.5rem;
}
.doc-header-inner, .doc-main, .doc-footer-inner { max-width: 820px; margin: 0 auto; }
.brand-row { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 1.5rem; }
.brand-logo {
  display: block;
  height: 36px;
  width: auto;
  max-width: 220px;
  object-fit: contain;
}
.brand-mark {
  width: 38px; height: 38px; border-radius: 10px; background: #fff; color: var(--brand);
  display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 1.1rem;
  text-decoration: none;
}
.brand-name { font-weight: 700; font-size: 1.15rem; letter-spacing: -0.01em; color: #fff; text-decoration: none; }
.doc-header h1 { margin: 0 0 0.4rem; font-size: 2rem; letter-spacing: -0.02em; }
.doc-updated { color: rgba(255,255,255,0.8); font-size: 0.9rem; margin: 0; }
.doc-main { padding: 2.5rem 1.5rem 1rem; }
.doc-main h2 { font-size: 1.25rem; margin: 2.25rem 0 0.5rem; letter-spacing: -0.01em; }
.doc-main h3 { font-size: 1.02rem; margin: 1.4rem 0 0.35rem; }
.doc-main p, .doc-main li { color: #1e293b; }
.doc-main ul, .doc-main ol { padding-left: 1.25rem; }
.doc-main li { margin: 0.3rem 0; }
.intro { font-size: 1.05rem; color: #334155; }
.toc {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}
.toc strong {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.6rem;
}
.toc ol { margin: 0; padding-left: 1.1rem; }
.toc a { color: var(--brand); text-decoration: none; }
.toc a:hover { text-decoration: underline; }
.callout {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  color: #334155;
  font-size: 0.95rem;
}
a { color: var(--brand); }
.doc-footer { border-top: 1px solid var(--line); margin-top: 2.5rem; background: #fff; }
.doc-footer-inner {
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  align-items: center;
  justify-content: space-between;
}
.doc-footer nav { display: flex; flex-wrap: wrap; gap: 0.9rem; }
.doc-footer a { color: var(--muted); text-decoration: none; font-size: 0.875rem; }
.doc-footer a:hover { color: var(--brand); }
.doc-footer .copy { color: var(--muted); font-size: 0.8125rem; }
@media (max-width: 640px) { .doc-header h1 { font-size: 1.6rem; } }