:root{--cobalt:#2854a1;--navy:#102449;--sky:#d9eff7;--mint:#d8f2e9;--paper:#f8fbfd;--white:#fff;--ink:#12213a;--muted:#52647d;--line:#b9cce1;--sans:"Hiragino Sans","Yu Gothic",YuGothic,Meiryo,system-ui,sans-serif;--mono:ui-monospace,SFMono-Regular,Menlo,monospace}*{box-sizing:border-box}html{background:var(--paper)}body{color:var(--ink);font-family:var(--sans);margin:0;font-size:16px;line-height:1.75}a{color:inherit}button,input{font:inherit}.rail-wrap{max-width:1120px;margin:auto;padding-inline:28px}.skip-link{background:var(--navy);color:#fff;z-index:20;padding:.7rem 1rem;position:fixed;top:-4rem;left:1rem}.skip-link:focus{top:1rem}.masthead{background:var(--white);border-bottom:1px solid var(--line)}.masthead .rail-wrap{align-items:center;gap:18px;min-height:78px;display:flex}.brand{color:var(--navy);font-family:var(--mono);letter-spacing:-.04em;align-items:center;gap:9px;font-size:.95rem;font-weight:800;text-decoration:none;display:flex}.brand 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p:last-child{color:var(--muted);font-size:.9rem}.not-found{padding-bottom:100px}.action-link{background:var(--cobalt);color:#fff;gap:10px;margin-top:22px;padding:11px 15px;font-weight:700;text-decoration:none;display:inline-flex}.site-footer{background:var(--navy);color:#dbe7fa}.footer-grid{grid-template-columns:1.1fr 1.5fr auto;gap:30px;padding-top:30px;padding-bottom:30px;font-size:.78rem;line-height:1.65;display:grid}.footer-grid p{margin:0}.footer-grid small{white-space:nowrap;color:#a9bddb;align-self:end}@media (width<=680px){.rail-wrap,.hero,.stage-section,.page-intro,.article-shell,.recommendations,.not-found{padding-inline:20px}.masthead .rail-wrap{flex-wrap:wrap;gap:7px 14px;min-height:auto;padding-top:14px;padding-bottom:14px}.brand-note{font-size:.7rem}.masthead nav{order:3;justify-content:space-between;gap:8px;width:100%;margin-left:0}.masthead nav 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print{body{color:#000;background:#fff;font-size:11pt}.masthead,.site-footer,.back-link,.toolbar,.privacy,.recommendations,.skip-link{display:none}.article-shell{max-width:none;padding:0}.check-panel{color:#000;background:#fff;border:1px solid #000;padding:0}.check-panel-head{padding:8px 0;display:block}.check-panel-head .section-code,.check-panel-head span{color:#000}.checklist,.checklist li{border-color:#000}.checklist input{appearance:none;accent-color:#0000;border:1px solid #000;border-radius:0}.checklist input:checked:after{content:"✓";text-align:center;margin-top:-5px;display:block}.checklist small{color:#333}.checklist b{color:#000}.article-copy{margin-top:22px}}