.site-header .current { border-bottom-color: var(--green); }

.detail-hero {
  width: min(1180px, calc(100% - 3rem));
  min-height: 560px;
  margin: clamp(2rem, 5vw, 4.5rem) auto 0;
  display: grid;
  grid-template-columns: minmax(360px, .9fr) minmax(0, 1.1fr);
  background: var(--paper);
}
.detail-copy { align-self: center; padding: clamp(2.7rem, 5vw, 4.5rem); }
.detail-copy h1 { margin: 1rem 0 .8rem; font-size: clamp(2.7rem, 4.8vw, 5rem); line-height: 1.22; letter-spacing: .01em; }
.detail-copy > p:not(.eyebrow):not(.detail-meta):not(.hero-slogan) { max-width: 650px; color: var(--muted); font-size: 1.02rem; }
.hero-slogan { margin: 0 0 1rem; color: var(--ink); font-family: var(--serif); font-size: clamp(1.35rem, 2.2vw, 2rem); font-weight: 700; }
.detail-meta { display: flex; flex-wrap: wrap; gap: .45rem .8rem; color: var(--green-dark); font-size: .78rem; font-weight: 700; letter-spacing: .08em; }
.detail-meta span + span::before { content: "・"; margin-right: .8rem; }
.specs { display: flex; flex-wrap: wrap; gap: 1.2rem 2.5rem; margin: 2rem 0 0; padding-top: 1.25rem; border-top: 1px solid var(--line); }
.specs dt { color: var(--muted); font-size: .72rem; letter-spacing: .1em; }
.specs dd { margin: .2rem 0 0; font-weight: 700; }
.detail-cover { min-height: 560px; margin: 0; overflow: hidden; background: #e8edeb; }
.detail-cover img { width: 100%; height: 100%; min-height: 560px; object-fit: contain; object-position: 50% 50%; }

.case-summary,
.spaces-section,
.photo-section,
.faq-section { width: min(1180px, calc(100% - 3rem)); margin: 0 auto; padding: clamp(4.5rem, 8vw, 7rem) 0; }
.case-summary { display: grid; grid-template-columns: minmax(260px, .75fr) minmax(0, 1.25fr); grid-template-areas: "title content"; column-gap: clamp(2.5rem, 7vw, 7rem); border-bottom: 1px solid var(--line); }
.case-summary > header { grid-area: title; }
.summary-intro { max-width: 360px; margin: 1.5rem 0 0; color: var(--muted); font-size: .9rem; line-height: 1.75; }
.summary-list { grid-area: content; border-top: 1px solid var(--line); }
.case-summary h2, .spaces-section h2, .photo-section h2, .faq-section h2 { margin-bottom: 0; }
.summary-list article { display: grid; grid-template-columns: minmax(120px, .35fr) minmax(0, 1fr); gap: 2rem; padding: 1.55rem 0; border-bottom: 1px solid var(--line); }
.summary-list h3 { margin: 0; font-family: var(--serif); font-size: 1.25rem; }
.summary-list ul { display: grid; gap: .45rem; margin: 0; padding: 0; color: var(--muted); font-size: .92rem; list-style: none; }
.summary-list li { position: relative; padding-left: 1rem; }
.summary-list li::before { content: ""; position: absolute; left: 0; top: .8em; width: 5px; height: 5px; border-radius: 50%; background: var(--green); }
.measurement-note { grid-column: 2; margin: .75rem 0 0; color: var(--muted); font-size: .74rem; line-height: 1.65; }

.spaces-section > header, .photo-section > header, .faq-section > header { margin-bottom: 2.25rem; }
.spaces-section > header > p:last-child { max-width: 720px; color: var(--muted); }
.space-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(2rem, 4vw, 4rem) clamp(1rem, 2vw, 1.75rem); }
.space-grid figure, .photo-grid figure { min-width: 0; margin: 0; }
.space-grid img { width: 100%; aspect-ratio: 16 / 9; object-fit: contain; background: #eef1ef; }
.space-grid figcaption, .photo-grid figcaption { min-height: 3.2rem; padding: .8rem .1rem 0; color: var(--muted); font-size: .86rem; line-height: 1.6; }
.space-grid figcaption strong, .photo-grid figcaption strong { display: block; margin-bottom: .3rem; color: var(--ink); font-family: var(--serif); font-size: 1rem; }

.photo-section { padding-top: 1.5rem; }
.photo-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(2rem, 3.5vw, 3.5rem) clamp(1rem, 2vw, 1.75rem); }
.photo-grid img { width: 100%; aspect-ratio: 4 / 3; object-fit: contain; background: #eef1ef; }

.faq-section { display: grid; grid-template-columns: minmax(260px, .7fr) minmax(0, 1.3fr); gap: clamp(2.5rem, 7vw, 7rem); border-top: 1px solid var(--line); }
.faq-section details { border-bottom: 1px solid var(--line); }
.faq-section summary { position: relative; padding: 1.4rem 2rem 1.4rem 0; list-style: none; cursor: pointer; font-family: var(--serif); font-size: 1.15rem; font-weight: 700; }
.faq-section summary::-webkit-details-marker { display: none; }
.faq-section summary::after { content: "+"; position: absolute; right: .25rem; color: var(--green-dark); }
.faq-section details[open] summary::after { content: "−"; }
.faq-section details p { padding-right: 2rem; color: var(--muted); font-size: .9rem; }
.case-back { padding: 0 1.25rem 7rem; text-align: center; }
.case-back a { padding-bottom: .25rem; border-bottom: 1px solid currentColor; font-weight: 700; }

.preview-footer { display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding: 2.3rem clamp(1.25rem, 7vw, 8rem); background: #102b34; color: rgba(255,255,255,.72); }
.preview-footer img { width: 250px; height: 58px; object-fit: contain; object-position: left; box-sizing: border-box; padding: .3rem .5rem; background: #fff; }
.preview-footer p { margin: 0; font-size: .78rem; }

@media (max-width: 900px) {
  .detail-hero { width: min(720px, calc(100% - 2.5rem)); grid-template-columns: 1fr; }
  .detail-cover { min-height: auto; order: -1; }
  .detail-cover img { min-height: auto; aspect-ratio: 16 / 9; }
  .case-summary, .spaces-section, .photo-section, .faq-section { width: min(720px, calc(100% - 2.5rem)); }
  .photo-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 650px) {
  .detail-hero, .case-summary, .spaces-section, .photo-section, .faq-section { width: calc(100% - 2rem); }
  .detail-copy { padding: 3rem 1.25rem 3.5rem; }
  .detail-copy h1 { font-size: clamp(2.45rem, 12vw, 3.4rem); }
  .case-summary, .faq-section { grid-template-columns: 1fr; gap: 1.5rem; }
  .case-summary { grid-template-areas: "title" "content"; }
  .summary-list article, .space-grid, .photo-grid { grid-template-columns: 1fr; }
  .summary-list article { gap: .6rem; }
  .measurement-note { grid-column: 1; }
  .preview-footer { display: grid; }
}