:root {
  font-family: "Segoe UI", Arial, sans-serif;
  color: #2d3336;
  background: #f4f5f5;
  font-synthesis: none;
  line-height: 1.6;
  --muted: #626b70;
  --line: #d8dddf;
}
* { box-sizing: border-box; }
body { margin: 0; }
p, h1, h2, dl { margin: 0; }
a { color: inherit; }
a:focus-visible, [tabindex="-1"]:focus-visible { outline: 3px solid #376b88; outline-offset: 4px; }
.skip-link { position: absolute; top: 8px; left: 12px; z-index: 2; padding: 10px 16px; background: white; transform: translateY(-180%); }
.skip-link:focus { transform: none; }
.site-header { background: #fff; border-bottom: 1px solid var(--line); }
.header-inner { max-width: 1500px; margin: auto; padding: 24px 40px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.eyebrow { color: var(--muted); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; font-weight: 600; }
.site-name { font-size: 25px; font-weight: 600; }
.site-name span { color: var(--muted); font-size: 15px; font-weight: 400; }
.test-badge { padding: 7px 12px; border: 1px solid #7b858a; font-size: 11px; font-weight: 600; letter-spacing: .08em; }
.notice { border-bottom: 1px solid var(--line); background: #e9edef; padding: 12px 40px; color: #495359; font-size: 13px; }
.notice p { max-width: 1420px; margin: auto; }
.layout { max-width: 1500px; margin: auto; padding: 40px; display: grid; grid-template-columns: 210px minmax(0, 1fr) 230px; align-items: start; gap: 36px; }
.sidebar, main, .context { min-width: 0; }
.sidebar nav { display: grid; margin-top: 16px; gap: 4px; }
.sidebar nav a { display: flex; gap: 10px; align-items: baseline; padding: 10px 8px; text-decoration: none; border-bottom: 1px solid var(--line); font-size: 14px; }
.sidebar nav a:hover { background: #e5e9eb; }
.nav-number { color: var(--muted); font-size: 11px; }
.sidebar-note, .context-note { font-size: 12px; color: var(--muted); margin-top: 24px; }
.breadcrumb { color: var(--muted); font-size: 12px; margin-bottom: 16px; }
.breadcrumb span { margin: 0 8px; }
article { border: 1px solid var(--line); background: #fff; padding: 32px; }
.article-header { padding-bottom: 24px; border-bottom: 1px solid var(--line); }
h1 { font-size: clamp(26px, 2.1vw, 36px); line-height: 1.25; letter-spacing: -.025em; margin: 8px 0 12px; }
.lead { font-size: 14px; color: var(--muted); }
.placeholder-block { padding-top: 24px; }
.block-label { display: block; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; font-size: 10px; margin-bottom: 12px; }
article p:not(.eyebrow):not(.lead) { font-size: 14px; }
.text-lines { display: grid; gap: 9px; margin: 20px 0 4px; }
.text-lines span { display: block; height: 6px; background: #e7eaec; }
.text-lines span:last-child { width: 68%; }
.article-section { margin-top: 30px; padding-top: 24px; border-top: 1px solid var(--line); }
.article-section h2 { font-size: 23px; line-height: 1.3; margin: 8px 0 12px; }
.outline-box { border: 1px dashed #bac2c6; margin-top: 18px; padding: 16px; }
.outline-box .text-lines { margin-top: 0; }
.info-card { padding: 20px; border: 1px solid var(--line); background: #fafbfb; margin-bottom: 18px; }
.info-card h2 { font-size: 16px; line-height: 1.4; margin: 8px 0 16px; }
.info-card dl { display: grid; gap: 12px; }
dt { color: var(--muted); font-size: 11px; }
dd { margin: 0; font-size: 13px; }
.info-card p:not(.eyebrow) { font-size: 13px; }
.muted { color: var(--muted); margin-top: 12px; }
.site-footer { max-width: 1420px; margin: 0 auto; padding: 20px 0; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 16px; font-size: 12px; color: var(--muted); }
@media (max-width: 1100px) {
  .layout { grid-template-columns: 190px minmax(0, 1fr); gap: 24px; }
  .context { grid-column: 2; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .info-card { margin: 0; }
  .context-note { grid-column: 1 / -1; margin-top: 0; }
  .site-footer { margin: 0 40px; }
}
@media (max-width: 650px) {
  .header-inner { padding: 22px 20px; flex-direction: column; align-items: flex-start; gap: 14px; }
  .site-name span { display: block; }
  .notice { padding: 14px 20px; }
  .layout { padding: 24px 20px; grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .sidebar-note { margin-top: 16px; }
  article { padding: 22px; }
  .context { grid-column: 1; grid-template-columns: minmax(0, 1fr); }
  .context-note { grid-column: 1; }
  .site-footer { margin: 0 20px; flex-direction: column; gap: 8px; }
}