.detail-page { background: var(--paper); }
.detail-page main { overflow: hidden; }
.detail-page .site-header { position: absolute; }

.detail-hero {
  position: relative;
  min-height: 620px;
  padding: 165px max(28px, calc(50vw - 600px)) 105px;
  overflow: hidden;
  color: #fff;
  background: radial-gradient(circle at 82% 35%, #376b75 0, #173c4f 30%, var(--navy-deep) 68%);
}
.detail-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .13;
  background-image: linear-gradient(#ffffff29 1px, transparent 1px), linear-gradient(90deg, #ffffff29 1px, transparent 1px);
  background-size: 72px 72px;
}
.detail-hero::after {
  content: "";
  position: absolute;
  top: 90px;
  right: -170px;
  width: 520px;
  height: 520px;
  border: 1px solid #ffffff2a;
  border-radius: 50%;
}
.detail-hero-inner { position: relative; z-index: 2; max-width: 880px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 45px; color: #ffffff87; font-size: 10px; letter-spacing: .05em; }
.breadcrumbs a { border-bottom: 1px solid #ffffff42; }
.detail-hero h1 { max-width: 830px; margin: 0; font-family: "Yu Mincho", YuMincho, "Hiragino Mincho ProN", serif; font-size: clamp(42px, 6vw, 74px); font-weight: 500; line-height: 1.42; }
.detail-hero-lead { max-width: 720px; margin: 28px 0 0; color: #ffffffc4; font-size: clamp(14px, 1.5vw, 17px); line-height: 2; }
.detail-hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 28px; margin-top: 36px; }
.detail-hero .text-link { padding-bottom: 2px; }

.article-shell { max-width: 1060px; margin: 0 auto; padding: 125px 38px 145px; }
.article-lead { display: grid; grid-template-columns: minmax(0, 1fr) 235px; gap: clamp(42px, 8vw, 95px); align-items: start; margin-bottom: 110px; }
.article-lead h2, .content-block h2, .faq-section h2, .related-section h2 { margin: 0; font-family: "Yu Mincho", YuMincho, "Hiragino Mincho ProN", serif; font-size: clamp(32px, 4vw, 50px); font-weight: 500; line-height: 1.55; }
.article-lead p, .content-block > p { margin: 28px 0 0; color: #526066; font-size: 14px; line-height: 2.15; }
.review-card { padding: 26px; border-top: 2px solid var(--teal); background: #eef0ec; }
.review-card small { display: block; color: #6c7b7b; font-size: 9px; letter-spacing: .12em; text-transform: uppercase; }
.review-card strong { display: block; margin-top: 10px; font-family: "Yu Mincho", YuMincho, serif; font-size: 20px; font-weight: 500; }
.review-card p { margin: 9px 0 0; color: #657177; font-size: 11px; line-height: 1.8; }
.review-card time { display: block; margin-top: 17px; color: #7e8989; font-size: 9px; }

.answer-section { padding: 0 0 95px; }
.answer-section > .kicker { margin-bottom: 18px; }
.answer-section > h2 { margin: 0; font-family: "Yu Mincho", YuMincho, "Hiragino Mincho ProN", serif; font-size: clamp(30px, 4vw, 46px); font-weight: 500; line-height: 1.55; }
.answer-section > p { max-width: 780px; margin: 24px 0 0; color: #526066; font-size: 14px; line-height: 2.15; }
.answer-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; margin: 42px 0 0; padding: 1px; background: #ccd4d1; }
.answer-card { padding: 28px; background: #fff; }
.answer-card dt { color: var(--navy); font-family: "Yu Mincho", YuMincho, serif; font-size: 18px; font-weight: 600; line-height: 1.65; }
.answer-card dd { margin: 12px 0 0; color: #657177; font-size: 12px; line-height: 1.95; }
.answer-card strong { color: #376b75; font-weight: 600; }

.content-block { padding: 95px 0; border-top: 1px solid #d8ddda; }
.content-block:first-of-type { border-top: 0; }
.content-block > .kicker { margin-bottom: 18px; }
.source-note, .legal-note { margin-top: 24px !important; padding-left: 16px; border-left: 2px solid #a9c6c2; color: #738080 !important; font-size: 11px !important; line-height: 1.9 !important; }
.source-note a { border-bottom: 1px solid; }
.fact-box { margin-top: 42px; padding: 30px 34px; border: 1px solid #c8d2cf; background: #f3f5f2; }
.fact-box strong { display: block; color: var(--navy); font-family: "Yu Mincho", YuMincho, serif; font-size: 23px; font-weight: 500; }
.fact-box p { margin: 10px 0 0; color: #5d6a6d; font-size: 13px; line-height: 2; }

.duty-grid, .issue-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; margin-top: 48px; background: #ccd4d1; border: 1px solid #ccd4d1; }
.duty-card, .issue-card { min-height: 205px; padding: 31px; background: #fff; }
.duty-card span, .issue-card span { color: var(--teal); font: 13px Georgia, serif; }
.duty-card h3, .issue-card h3 { margin: 18px 0 0; font-family: "Yu Mincho", YuMincho, serif; font-size: 21px; font-weight: 500; line-height: 1.6; }
.duty-card p, .issue-card p { margin: 13px 0 0; color: #697578; font-size: 12px; line-height: 1.9; }

.process-list { display: grid; gap: 0; margin: 48px 0 0; padding: 0; list-style: none; border-top: 1px solid #ccd4d1; }
.process-list li { display: grid; grid-template-columns: 72px 190px 1fr; gap: 26px; padding: 27px 0; border-bottom: 1px solid #ccd4d1; }
.process-list span { color: var(--teal); font: 16px Georgia, serif; }
.process-list strong { font-family: "Yu Mincho", YuMincho, serif; font-size: 18px; font-weight: 500; }
.process-list p { margin: 0; color: #657177; font-size: 12px; line-height: 1.9; }

.faq-section { padding: 100px 0; border-top: 1px solid #d8ddda; }
.faq-list { margin-top: 48px; border-top: 1px solid #c9d0cd; }
.faq-list details { border-bottom: 1px solid #c9d0cd; }
.faq-list summary { position: relative; padding: 25px 48px 25px 0; cursor: pointer; font-family: "Yu Mincho", YuMincho, serif; font-size: 18px; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; top: 23px; right: 5px; color: var(--teal); font: 22px Arial, sans-serif; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { max-width: 820px; margin: 0; padding: 0 45px 27px 0; color: #657177; font-size: 13px; line-height: 2; }

.related-section { padding: 100px 0 0; border-top: 1px solid #d8ddda; }
.related-card { display: grid; grid-template-columns: 230px 1fr auto; align-items: center; gap: 34px; margin-top: 38px; padding: 24px; background: var(--navy-deep); color: #fff; }
.related-card img { display: block; width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }
.related-card small { color: #a9d3ce; font-size: 10px; }
.related-card strong { display: block; margin-top: 6px; font-family: "Yu Mincho", YuMincho, serif; font-size: 25px; font-weight: 500; }
.related-card > span:last-child { padding-right: 8px; font-size: 22px; }

.detail-cta { padding: 110px max(28px, calc(50vw - 600px)); background: #dfe6e2; }
.detail-cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 42px; }
.detail-cta h2 { max-width: 720px; margin: 0; font-family: "Yu Mincho", YuMincho, serif; font-size: clamp(32px, 4vw, 50px); font-weight: 500; line-height: 1.55; }
.detail-cta p { max-width: 580px; margin: 20px 0 0; color: #657177; font-size: 13px; line-height: 2; }
.detail-cta .primary-button { flex: 0 0 auto; background: var(--navy); color: #fff; }

@media (max-width: 900px) {
  .detail-hero { min-height: 560px; padding: 135px 24px 80px; }
  .article-shell { padding: 95px 24px 115px; }
  .article-lead { grid-template-columns: 1fr; margin-bottom: 75px; }
  .review-card { max-width: 340px; }
  .answer-grid { grid-template-columns: 1fr; }
  .related-card { grid-template-columns: 170px 1fr auto; }
  .detail-cta-inner { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 620px) {
  .detail-hero { min-height: 590px; }
  .detail-hero h1 { font-size: 39px; }
  .detail-hero-actions { align-items: flex-start; flex-direction: column; gap: 18px; }
  .content-block { padding: 72px 0; }
  .answer-section { padding-bottom: 72px; }
  .answer-card { padding: 24px; }
  .duty-grid, .issue-grid { grid-template-columns: 1fr; }
  .process-list li { grid-template-columns: 42px 1fr; gap: 14px; }
  .process-list p { grid-column: 2; }
  .related-card { grid-template-columns: 1fr; }
  .related-card img { max-width: 360px; }
  .detail-cta { padding: 80px 24px; }
}