:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #29313b;
  background: #fff;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  --accent: #315eb3;
  --muted: #596575;
  --line: #e0e5ec;
}
* { box-sizing: border-box; }
body { margin: 0; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
[hidden] { display: none !important; }
.skip-link { position: fixed; top: -100px; left: 16px; padding: 12px; background: white; z-index: 3; }
.skip-link:focus { top: 12px; }
.manual-header { min-height: 76px; padding: 16px 32px; border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 28px; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 17px; font-weight: 650; color: inherit; text-decoration: none; }
.manual-label { color: var(--muted); font-size: 14px; }
.beta { font-size: 11px; background: #eef2fa; padding: 3px 7px; border-radius: 4px; margin-left: 6px; }
.manual-header nav { margin-left: auto; display: flex; gap: 24px; font-size: 14px; }
.manual-header nav a { color: inherit; }
.manual-layout { display: grid; grid-template-columns: 220px minmax(0, 850px) 150px; max-width: 1440px; margin: auto; }
.sidebar { background: #f6f7f9; border-right: 1px solid var(--line); min-height: calc(100svh - 76px); padding: 14px 12px; }
.sidebar-content { position: sticky; top: 24px; max-height: calc(100svh - 48px); overflow-y: auto; }
.search-label { display: block; font-size: 11px; font-weight: 600; margin-bottom: 4px; }
#search { width: 100%; min-width: 0; padding: 6px; border: 1px solid #b6c0cd; border-radius: 4px; background: #fff; color: inherit; font: inherit; font-size: 12px; margin-bottom: 12px; }
#search-status { font-size: 11px; color: var(--muted); line-height: 1.4; margin: -4px 0 10px; }
.sidebar h2 { font-size: 10px; text-transform: uppercase; letter-spacing: .7px; margin: 12px 0 4px; color: var(--muted); }
.sidebar section:first-child h2 { margin-top: 0; }
.sidebar ul, .contents ul { list-style: none; padding: 0; margin: 0; }
.sidebar li { margin: 0; }
.sidebar li a, .sidebar .planned { display: block; font-size: 12px; padding: 2px 5px; border-radius: 4px; line-height: 1.3; text-decoration: none; }
.sidebar a[aria-current="page"] { color: #244b94; background: #e6ecf8; font-weight: 600; }
.sidebar .planned small { display: inline-block; margin-left: 4px; font-size: 8px; text-transform: uppercase; letter-spacing: .2px; }
.planned { color: var(--muted); }
main { padding: 32px clamp(24px, 4vw, 64px) 24px; min-width: 0; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: 12px; margin-bottom: 32px; }
h1 { font-size: clamp(30px, 4vw, 42px); letter-spacing: -1.2px; line-height: 1.15; margin: 0 0 24px; font-weight: 650; }
h2 { font-size: 23px; margin: 42px 0 16px; letter-spacing: -.4px; }
h3 { font-size: 18px; margin-top: 28px; }
h2, h3 { scroll-margin-top: 24px; }
article { line-height: 1.8; font-size: 15px; overflow-wrap: anywhere; }
article > p:first-of-type { font-size: 18px; line-height: 1.7; color: var(--muted); }
article li { padding-left: 4px; margin-bottom: 9px; }
article img { max-width: 100%; height: auto; border-radius: 6px; }
code { font-size: .9em; background: #f1f3f6; padding: 2px 5px; border-radius: 3px; }
pre { overflow-x: auto; padding: 18px; background: #f1f3f6; border-radius: 6px; }
pre code { padding: 0; }
blockquote { border-left: 3px solid #6c8dc5; padding: 12px 20px; margin: 24px 0; background: #f3f6fb; }
.contents { padding: 14px 8px; }
.contents nav { position: sticky; top: 24px; border-left: 1px solid var(--line); padding-left: 8px; }
.contents h2 { text-transform: uppercase; font-size: 10px; letter-spacing: .7px; margin: 0 0 6px; }
.contents a { display: block; font-size: 12px; line-height: 1.3; color: var(--muted); padding: 2px 0; text-decoration: none; }
.contents .subheading { padding-left: 6px; }
article > p.eyebrow { font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: var(--accent); }
.intro-note, .error { padding: 16px 20px; background: #f3f6fb; border: 1px solid #d5dfef; border-radius: 6px; font-size: 14px; line-height: 1.7; margin-bottom: 28px; }
.error { background: #fff4f1; border-color: #e6b5a8; }
.chapter-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.chapter-card { padding: 22px; border: 1px solid var(--line); border-radius: 7px; }
.chapter-card h2 { margin: 0 0 10px; font-size: 19px; }
.chapter-card p { color: var(--muted); font-size: 13px; line-height: 1.6; }
.chapter-card ul { padding-left: 18px; font-size: 14px; }
.chapter-card .planned { padding: 0; font-size: 13px; }
.pagination { border-top: 1px solid var(--line); margin-top: 48px; padding-top: 24px; display: flex; justify-content: space-between; gap: 24px; font-size: 13px; }
.pagination a { max-width: 48%; }
footer { margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; line-height: 1.8; }
.noscript { padding: 24px; }
@media (max-width: 1150px) {
  .manual-layout { grid-template-columns: 210px minmax(0, 1fr); }
  .contents { display: none; }
}
@media (max-width: 900px) {
  .manual-header { flex-wrap: wrap; gap: 12px; padding: 16px 20px; }
  .manual-label { display: none; }
  .manual-header nav { gap: 16px; }
  .manual-layout { display: block; }
  .sidebar { min-height: 0; padding: 12px; border-right: 0; border-bottom: 1px solid var(--line); }
  .sidebar-content { position: static; max-height: 260px; }
  main { padding: 28px 24px; }
}
@media (max-width: 540px) {
  .chapter-grid { grid-template-columns: 1fr; }
  .brand { font-size: 15px; }
}