.folio-masthead { background: var(--field); color: #fff; }
.masthead-inner { max-width: 1192px; margin: auto; padding: 1.2rem 2rem; display: flex; align-items: center; gap: 1rem; font-size: 21px; }
.masthead-aside { margin-left: auto; font-style: italic; font-size: 19px; }
.fold-mark { width: 19px; height: 26px; flex: none; display: block; border: 2px solid currentColor; border-radius: 3px; transform: rotate(-8deg); }
.fold-mark::after { content: ""; display: block; width: 8px; height: 9px; border-left: 1px solid currentColor; border-bottom: 1px solid currentColor; margin-left: 7px; }
.breadcrumb-wrap { max-width: 1192px; margin: auto; padding: .4rem 2rem; }
.breadcrumbs { min-height: 48px; display: flex; flex-wrap: wrap; align-items: center; gap: .35rem .8rem; font-size: 18px; color: var(--muted); }
.breadcrumbs a { display: inline-flex; align-items: center; padding: .25rem 0; }
.briefing-opening { max-width: 1192px; padding: 3.5rem 3.75rem 3.7rem; margin: .5rem auto 3.2rem; background: var(--field-light); border-radius: var(--round); }
.opening-copy { max-width: 57rem; }
.reading-kind { margin-bottom: 1.2rem; color: var(--brick); font-size: 20px; }
.opening-copy h1 { max-width: 22ch; }
.guide-framing { color: var(--brick); font-weight: 550; font-size: 21px; line-height: 1.4; max-width: 49ch; margin: 1.5rem 0 0; }
.scenario { max-width: 62ch; font-size: 24px; line-height: 1.4; margin: 1.75rem 0 0; }
.home .briefing-opening { display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: 3rem; align-items: end; }
.opening-side { padding: 2rem 1.8rem; background: var(--field); color: #fff; border-radius: var(--round); }
.opening-side p { font-style: italic; font-size: 20px; margin-bottom: 1.4rem; }
.opening-side dl { display: grid; gap: 1.2rem; }
.opening-side dt { font-family: var(--display-face); font-size: 31px; line-height: 1.2; }
.opening-side dd { font-size: 19px; line-height: 1.3; padding-top: .25rem; }
.opening-mark { width: 22px; height: 28px; border-left: 3px solid var(--brick); border-bottom: 3px solid var(--brick); margin-top: 2rem; transform: rotate(-6deg); }
.opening-mark::after { content: ""; display: block; width: 16px; height: 22px; border-left: 1px solid var(--brick); border-bottom: 1px solid var(--brick); margin-left: 5px; }
@media (max-width: 1240px) {
  .briefing-opening { margin-left: 1.5rem; margin-right: 1.5rem; }
  .home .briefing-opening { grid-template-columns: minmax(0, 1fr) 220px; gap: 2rem; padding: 3rem; }
}
@media (max-width: 900px) {
  .home .briefing-opening { grid-template-columns: 1fr; }
  .opening-side dl { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .opening-side { max-width: 100%; }
  .briefing-opening { padding: 2.7rem; }
}
@media (max-width: 620px) {
  .masthead-inner { padding: 1rem 1.25rem; font-size: 20px; }
  .masthead-aside { display: none; }
  .breadcrumb-wrap { padding: .4rem 1.25rem; }
  .breadcrumbs { font-size: 18px; line-height: 1.35; }
  .briefing-opening, .home .briefing-opening { margin: .25rem .75rem 2rem; padding: 2rem 1.25rem; gap: 2rem; }
  .reading-kind { font-size: 19px; margin-bottom: 1rem; }
  .guide-framing { font-size: 20px; margin-top: 1.15rem; }
  .scenario { font-size: 22px; margin-top: 1.4rem; }
  .opening-side { padding: 1.5rem; }
  .opening-side dt { font-size: 27px; }
}