:root { color-scheme: light; --ink: #18344c; --blue: #116ca8; --line: #d6e4ed; }
* { box-sizing: border-box; }
html { scroll-padding-top: 22px; }
body { margin: 0; background: #f6fafd; color: var(--ink); font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; font-size: 16px; line-height: 1.95; }
a { color: var(--blue); text-underline-offset: 4px; }
a:focus-visible, summary:focus-visible, .table-scroll:focus-visible { outline: 3px solid #1379c2; outline-offset: 4px; }
.skip-link { position: absolute; top: -80px; left: 16px; background: #fff; z-index: 10; padding: 10px; }
.skip-link:focus { top: 8px; }
.guide-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; max-width: 1160px; padding: 16px 24px; margin: auto; border-bottom: 1px solid var(--line); }
.guide-brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-size: 17px; font-weight: 800; text-decoration: none; }
.guide-launch { padding: 8px 16px; background: #fff; border: 1px solid #b4ccdd; border-radius: 8px; font-size: 13px; font-weight: 700; text-decoration: none; white-space: nowrap; }
main { max-width: 1050px; margin: auto; padding: 0 24px; }
.breadcrumbs { display: flex; gap: 10px; flex-wrap: wrap; padding: 22px 0 0; color: #647d8e; font-size: 12px; }
.guide-intro { padding: 36px 0 32px; }
.eyebrow, .section-no { margin: 0 0 12px; color: #176595; font-size: 11px; font-weight: 800; letter-spacing: .16em; }
h1 { font-size: clamp(27px, 4vw, 42px); letter-spacing: -.025em; line-height: 1.5; margin: 0 0 20px; }
.guide-lead { font-size: 17px; line-height: 1.9; }
.guide-meta { font-size: 12px; color: #627a89; margin: 16px 0 24px; }
.primary-link { display: inline-flex; align-items: center; justify-content: space-between; gap: 24px; padding: 13px 22px; background: #0c5588; color: #fff; border-radius: 9px; font-size: 15px; font-weight: 700; text-decoration: none; }
.primary-link:hover { background: #07385b; }
.guide-note { font-size: 12px; color: #567283; margin: 12px 0 0; }
.guide-toc { display: flex; flex-wrap: wrap; gap: 8px 20px; border-block: 1px solid var(--line); padding: 18px 0; }
.guide-toc a { padding: 5px 0; font-size: 13px; font-weight: 700; }
.guide-body { max-width: 830px; margin: 0 auto; }
section { padding: 44px 0; border-bottom: 1px solid var(--line); }
h2 { margin: 0 0 22px; font-size: 25px; letter-spacing: -.01em; line-height: 1.65; }
h3 { margin: 26px 0 10px; font-size: 18px; }
p { margin: 0 0 18px; }
ul, ol { padding-left: 25px; }
li { padding-left: 4px; margin: 12px 0; }
.steps { padding-left: 28px; }
.steps li { margin: 24px 0; }
.steps li::marker { color: var(--blue); font-size: 22px; font-weight: 800; }
.steps strong { font-size: 18px; }
.steps p { margin: 7px 0 0; }
.tip { background: #e5f3fd; border-left: 3px solid #3298c7; border-radius: 0 8px 8px 0; padding: 18px 22px; }
.tip p { margin: 6px 0 0; }
.table-scroll { overflow-x: auto; margin: 22px 0; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
table { width: 100%; border-collapse: collapse; font-size: 14px; text-align: left; }
caption { text-align: left; padding: 15px 16px; color: #446579; font-weight: 700; background: #f0f7fb; }
th, td { padding: 15px 16px; border-top: 1px solid var(--line); vertical-align: top; }
thead { background: #e8f3f9; }
th[scope="row"] { width: 28%; min-width: 110px; }
.rule-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.rule-pair > div { border: 1px solid var(--line); padding: 20px; border-radius: 9px; background: #fff; }
.rule-pair h3 { margin-top: 0; }
.rule-pair p { margin-bottom: 0; font-size: 14px; }
.example { border: 1px solid #c9e2f2; background: #eaf6ff; padding: 22px; border-radius: 10px; margin: 20px 0; }
.example.alternate { background: #fff; }
.example h3 { margin: 0 0 16px; }
.example p:last-child { margin: 0; }
.route { font-size: 24px; font-weight: 800; line-height: 2; font-variant-numeric: tabular-nums; }
.route span { font-size: 15px; color: #356784; white-space: nowrap; }
.text-link { font-weight: 700; }
details { border-bottom: 1px solid var(--line); padding: 16px 0; }
summary { cursor: pointer; font-weight: 700; }
details p { margin: 14px 0 0; }
.related-links { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px; }
.related-links a { display: flex; flex-direction: column; gap: 12px; border: 1px solid var(--line); border-radius: 8px; background: white; padding: 18px; text-decoration: none; }
.related-links strong { font-size: 15px; }
.related-links span { font-size: 12px; color: #496a80; }
.guide-end { padding: 40px 0; }
.guide-footer { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 20px; max-width: 1160px; margin: 42px auto 0; padding: 24px; border-top: 1px solid var(--line); font-size: 12px; }
.guide-footer nav { display: flex; gap: 18px; }
@media(max-width:600px) {
 body { font-size: 15px; line-height: 1.95; }
 .guide-header { padding: 12px 16px; }
 .brand-long { display: none; }
 .guide-brand { font-size: 17px; }
 main { padding-inline: 18px; }
 .guide-intro { padding-block: 28px; }
 .guide-lead { font-size: 15px; }
 .primary-link { font-size: 14px; padding: 12px 17px; }
 section { padding-block: 32px; }
 h2 { font-size: 21px; margin-bottom: 18px; }
 .guide-toc { gap: 6px 15px; }
 .guide-toc a { font-size: 12px; }
 .rule-pair, .related-links { grid-template-columns: 1fr; }
 th,td { padding: 12px; font-size: 13px; }
 th[scope="row"] { min-width: 95px; }
 .example { padding: 16px; }
 .route { font-size: 21px; }
 .route span { font-size: 13px; }
}
@media print {
 .guide-header, .guide-toc, .guide-launch, .primary-link, .skip-link { display: none; }
 body { background: white; font-size: 11pt; }
 h2 { break-after: avoid; }
 table,.example,.tip { break-inside: avoid; }
}

.guide-cards { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 18px; }
.guide-cards article { padding: 24px; background: white; border: 1px solid var(--line); border-radius: 12px; }
.guide-cards h2 { font-size: 22px; margin-bottom: 12px; }
.guide-cards p:not(.section-no) { font-size: 14px; }
.guide-card-read { display: block; width: fit-content; margin-top: 15px; padding-block: 5px; font-size: 13px; }
.all-guides { margin-top: 24px; font-size: 14px; }
.guide-footer nav { flex-wrap: wrap; }
@media(max-width:600px) { .guide-cards { grid-template-columns: 1fr; } .guide-cards article { padding: 20px; } .guide-cards h2 { font-size: 20px; } }