body {
  margin: 0;
  padding: 0 18px 40px;
  background: #f8fafb;
  color: #243746;
  font-family: system-ui, sans-serif;
  line-height: 1.8;
}
main, header, footer { max-width: 880px; margin: auto; }
header { padding: 20px 0; border-bottom: 1px solid #dce5ea; display: flex; flex-wrap: wrap; gap: 4px 20px; align-items: baseline; }
header > a { font-weight: 700; text-decoration: none; }
header > span, .guide-breadcrumb, .guide-cta-note { font-size: 14px; color: #506776; }
a { color: #165e82; text-underline-offset: 3px; }
a:focus-visible, summary:focus-visible { outline: 3px solid #172d3b; outline-offset: 3px; }
h1 { font-size: clamp(25px, 5vw, 36px); line-height: 1.5; }
h2 { font-size: 23px; margin-top: 32px; line-height: 1.5; }
h3 { font-size: 19px; line-height: 1.6; }
p, li, th, td { overflow-wrap: anywhere; }
section { scroll-margin-top: 20px; }
.guide-breadcrumb { margin-top: 20px; }
.guide-intro { font-size: 18px; }
.guide-cta { display: inline-block; background: #26779b; color: #fff; padding: 12px 22px; border-radius: 6px; text-decoration: none; font-weight: 700; }
.guide-cta:hover { background: #1d5e7b; }
.guide-cta-note { display: inline-block; margin: 8px 0 8px 14px; }
.guide-toc { padding: 16px 20px; margin-top: 24px; border: 1px solid #dce5ea; border-radius: 8px; background: #fff; }
.guide-toc p { margin: 0 0 8px; font-weight: 700; }
.guide-toc ul { display: flex; flex-wrap: wrap; gap: 4px 24px; margin: 0; padding-left: 20px; }
.guide-toc li { margin: 0; }
.guide-toc a { display: inline-block; padding: 5px 0; }
.guide-sample { margin: 24px 0; }
.guide-sample img { display: block; box-sizing: border-box; width: 100%; height: auto; border: 1px solid #dce5ea; background: #fff; }
.guide-sample figcaption { margin-top: 8px; font-size: 14px; color: #506776; }
.guide-table { border-collapse: collapse; width: 100%; margin: 20px 0; background: #fff; }
.guide-table caption { text-align: left; margin-bottom: 8px; font-size: 14px; color: #506776; }
.guide-table th, .guide-table td { border: 1px solid #dce5ea; padding: 12px 16px; text-align: left; vertical-align: top; }
.guide-table thead { background: #eaf2f6; }
.guide-table tbody th { width: 30%; font-weight: 600; }
.guide-links { display: flex; flex-wrap: wrap; gap: 12px 24px; padding-left: 20px; }
li { margin-bottom: 12px; }
ol { padding-left: 24px; }
.guide-note { margin: 20px 0; padding: 16px; background: #eaf2f6; border-left: 4px solid #26779b; }
.guide-faq details { border-top: 1px solid #dce5ea; padding: 14px 0; }
.guide-faq summary { cursor: pointer; font-weight: 600; }
.guide-faq details p { margin-bottom: 0; }
.guide-next { margin-top: 32px; padding: 20px 24px; border: 1px solid #dce5ea; border-radius: 8px; background: #fff; }
.guide-next h2 { margin-top: 0; }
footer { margin-top: 40px; border-top: 1px solid #dce5ea; padding-top: 16px; }
.skip-link { position: absolute; top: 8px; left: 18px; padding: 10px 16px; background: #fff; z-index: 1; transform: translateY(-200%); }
.skip-link:focus { transform: translateY(0); }
@media (max-width: 480px) {
  .guide-cta-note { display: block; margin-left: 0; }
  .guide-table th, .guide-table td { padding: 10px; }
  .guide-next { padding: 16px; }
  .guide-intro { font-size: 17px; }
}
@media print {
  .skip-link, .guide-toc, .guide-cta, .guide-cta-note, .guide-next, footer { display: none; }
  body { background: #fff; color: #000; }
  .guide-table tr { break-inside: avoid; }
}