:root {
  color-scheme: light;
  --ink: #1f2933;
  --muted: #667085;
  --line: #d7dde6;
  --surface: #ffffff;
  --band: #f4f7f9;
  --accent: #126b5b;
  --accent-strong: #0f5146;
  --focus: #2f6fed;
  --warning-bg: #edf7f4;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: var(--ink); background: var(--band); }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.skip-link { position: absolute; left: 16px; top: -48px; z-index: 10; padding: 8px 12px; background: var(--ink); color: white; }
.skip-link:focus { top: 12px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.site-header { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 16px 28px; border-bottom: 1px solid var(--line); background: var(--surface); }
.brand { font-weight: 700; color: var(--ink); text-decoration: none; }
.site-header span { color: var(--muted); }
.header-search { display: flex; gap: 8px; min-width: min(360px, 42vw); }
input[type="search"] { width: 100%; min-height: 42px; padding: 9px 11px; border: 1px solid var(--line); border-radius: 6px; font: inherit; color: var(--ink); background: var(--surface); }
button { min-height: 42px; padding: 9px 14px; border: 1px solid var(--accent-strong); border-radius: 6px; font: inherit; font-weight: 650; color: white; background: var(--accent-strong); cursor: pointer; }
button:focus-visible, input:focus-visible, a:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.shell { display: grid; grid-template-columns: minmax(220px, 300px) minmax(0, 860px); gap: 32px; max-width: 1240px; margin: 0 auto; padding: 32px 28px; }
.nav { display: flex; flex-direction: column; gap: 14px; align-self: start; position: sticky; top: 24px; max-height: calc(100vh - 48px); overflow: auto; padding-right: 6px; }
.nav a { padding: 7px 10px; border-left: 3px solid transparent; color: var(--ink); text-decoration: none; overflow-wrap: anywhere; }
.nav a[aria-current="page"] { border-color: var(--accent); background: var(--surface); font-weight: 650; }
.nav-group { display: grid; gap: 4px; }
.nav-category { font-weight: 700; }
.nav-articles { display: grid; gap: 2px; }
.nav-articles a { color: var(--muted); font-size: 14px; }
.content { min-width: 0; padding: 32px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; }
h1 { font-size: clamp(32px, 5vw, 48px); line-height: 1.08; margin: 28px 0 18px; }
h2, h3 { line-height: 1.25; margin: 28px 0 12px; }
h1:first-child { margin-top: 0; }
p, ul { margin: 0 0 16px; }
li { margin: 6px 0; }
code { padding: 1px 4px; background: var(--band); border-radius: 4px; }
.notice { padding: 12px 14px; border-left: 4px solid var(--accent); background: var(--warning-bg); }
.meta { color: var(--muted); font-size: 14px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; color: var(--muted); font-size: 14px; }
.related { margin-top: 32px; padding-top: 18px; border-top: 1px solid var(--line); }
.related h2 { margin-top: 0; }
.contact-panel { margin-top: 32px; padding: 18px; border: 1px solid var(--line); border-radius: 8px; background: var(--band); }
.contact-panel h2 { margin-top: 0; }
.category-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; border-bottom: 1px solid var(--line); margin-top: 28px; }
.category-heading h2 { margin-top: 0; }
.article-list { padding-left: 20px; }
.article-list li { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 16px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.article-list span { color: var(--muted); font-size: 14px; }
.search-page-form { display: grid; gap: 8px; margin-bottom: 22px; }
.search-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
.site-footer { max-width: 1240px; margin: 0 auto; padding: 0 28px 32px; color: var(--muted); }
article, .content, .article-list a { overflow-wrap: anywhere; }
@media (max-width: 760px) {
  .site-header { display: block; padding: 14px 18px; }
  .site-header span { display: block; margin-top: 4px; }
  .header-search { min-width: 0; margin-top: 12px; }
  .shell { display: block; padding: 18px; }
  .nav { position: static; max-height: none; margin-bottom: 18px; padding-right: 0; }
  .nav-articles { display: none; }
  .nav-group { gap: 0; }
  .content { padding: 22px 18px; }
  .category-heading { display: block; }
  .article-list li { display: block; }
  .article-list span { display: block; margin-top: 2px; }
  .search-row, .header-search { grid-template-columns: 1fr; }
}