/* Service: Cotonoha Design / cases: the one — layout references. */
:root { --reference-ink: var(--ink); --reference-gray: var(--paper); --reference-paper: var(--paper); --reference-line: var(--line); }
.page-section { padding: 112px 0; background: #fff; color: var(--ink); font-family: 'Shippori Mincho', serif; }
.section-shell { width: min(1120px, calc(100% - 80px)); margin: 0 auto; }
.section-frame { position: relative; box-sizing: border-box; padding: 70px 60px 54px; background: var(--reference-gray); }
/* One shared title tab, based on the former AI Support label. */
.section-heading { position: absolute; top: 0; left: 50%; transform: translate(-50%, -50%); display: grid; place-items: center; min-width: 240px; max-width: calc(100% - 80px); margin: 0; padding: 14px 30px 16px; background: var(--gray-2); color: #fff; text-align: center; }
.h-en { font-family: 'Cormorant', 'Shippori Mincho', serif; font-size: 20px; font-weight: 500; line-height: 1.2; letter-spacing: 3px; color: inherit; }
.h-jp-tag { display: block; margin-top: 8px; font-size: 11px; font-weight: 400; line-height: 1.6; letter-spacing: .12em; color: inherit; }
.page-section h3, .page-section h4, .detail-body dt { color: var(--navy); }
.content-details summary, .inline-link, .footer-nav a { color: var(--navy); }
.nav-link { font-weight: 400; letter-spacing: .08em; }
.hero-description, .hero-button, .site-header .nav-link { font-family: 'Shippori Mincho', serif; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--navy); outline-offset: 6px; }

/* A quiet three-column image + text group, without separate card frames. */
.service-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 48px; align-items: start; }
.service-card { min-width: 0; }
.service-image { display: block; width: 100%; aspect-ratio: 1.38; object-fit: cover; background: #fff; }
.service-card h3 { margin: 25px 0 21px; text-align: center; font-size: 16px; line-height: 1.8; letter-spacing: .15em; font-weight: 600; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 5px; }
.service-card .card-copy { font-size: 13px; line-height: 2.25; letter-spacing: .055em; }
.content-details { margin-top: 22px; }
.content-details summary { position: relative; width: fit-content; max-width: 100%; padding: 8px 24px 8px 0; font-size: 12px; line-height: 1.8; letter-spacing: .06em; list-style: none; cursor: pointer; border-bottom: 1px solid var(--gray-1); }
.content-details summary::-webkit-details-marker { display: none; }
.content-details summary::after { content: '+'; position: absolute; right: 0; top: 7px; font-family: 'Noto Sans JP', sans-serif; font-size: 16px; font-weight: 300; }
.content-details[open] summary::after { content: '−'; }
.content-details summary:hover, .inline-link:hover { color: var(--hover); }
.detail-body { padding-top: 24px; font-size: 13px; line-height: 2.1; letter-spacing: .025em; }
.detail-body h4, .detail-body dt { margin: 20px 0 7px; font-weight: 500; }
.detail-body h4:first-child, .detail-body dt:first-child { margin-top: 0; }
.detail-body ul { list-style: disc; padding-left: 1.2em; }
.detail-body li + li { margin-top: 5px; }
.inline-link { display: inline-block; margin-top: 22px; font-size: 12px; line-height: 2; text-decoration: underline; text-underline-offset: 5px; }
.support-flow { margin-top: 48px; }
.support-flow > summary { margin: auto; padding-right: 38px; font-size: 14px; letter-spacing: .12em; }
.flow-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 32px; margin-top: 40px; }
.flow-number { font-family: 'Cormorant', serif; font-size: 22px; color: var(--gray-2); }
.flow-grid h4 { margin: 10px 0 14px; font-size: 15px; font-weight: 500; }
.flow-grid p { font-size: 13px; line-height: 2; }

/* A wide image with a short description, following the reference Works layout. */
.case-list { display: grid; gap: 80px; }
.case-card { display: grid; grid-template-columns: minmax(0, .92fr) minmax(0, 1.7fr); gap: 64px; align-items: center; padding: 40px; background: #fff; border-radius: 10px; }
.case-copy { padding: 12px 0; min-width: 0; }
.case-card h3 { margin: 0 0 10px; font-size: 18px; line-height: 1.8; letter-spacing: .06em; font-weight: 500; }
.case-category { margin-bottom: 40px; color: var(--gray-2); font-size: 12px; font-weight: 400; letter-spacing: .1em; line-height: 1.9; }
.case-card .card-copy { font-size: 14px; line-height: 2.1; letter-spacing: .04em; }
.case-outcome { margin-top: 15px; font-size: 13px; line-height: 2; letter-spacing: .04em; text-wrap: balance; }
.case-outcome strong { font-weight: 500; }
.case-card .content-details { margin-top: 22px; }
.case-card .detail-body { font-size: 13px; }
.case-meta { margin-top: 24px; padding-top: 14px; border-top: 1px solid var(--line); font-size: 12px; line-height: 1.9; }
.case-meta > div { display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 8px; margin-top: 5px; }
.case-meta dt { color: var(--gray-2); }
.case-visual { min-width: 0; }
.case-image { width: 100%; height: auto; aspect-ratio: 1.5; object-fit: cover; clip-path: polygon(0 1%,2% .3%,4% .8%,7% 0,11% .6%,14% .2%,18% .7%,22% 0,26% .6%,30% .2%,34% .7%,38% .2%,42% .7%,47% 0,52% .6%,57% .2%,62% .7%,67% 0,72% .5%,77% .2%,82% .6%,87% .1%,92% .6%,96% 0,99% 1%,100% 6%,99.5% 12%,100% 20%,99.5% 28%,100% 36%,99.5% 45%,100% 54%,99.5% 63%,100% 72%,99.5% 81%,100% 90%,99% 99%,96% 100%,92% 99.5%,87% 100%,82% 99.5%,77% 100%,72% 99.4%,67% 100%,62% 99.6%,57% 100%,52% 99.5%,47% 100%,42% 99.5%,37% 100%,32% 99.5%,27% 100%,22% 99.5%,17% 100%,12% 99.5%,7% 100%,2% 99.4%,0 98%,.5% 91%,0 83%,.5% 75%,0 67%,.5% 59%,0 51%,.5% 43%,0 35%,.5% 27%,0 19%,.5% 10%); }
.case-visual figcaption { margin-top: 12px; text-align: right; color: var(--gray-2); font-size: 10px; letter-spacing: .04em; }

/* The remaining one-page information uses the same restrained typography. */
.company-layout { display: grid; grid-template-columns: 1.1fr 1fr; gap: 96px; align-items: start; }
.company-layout h3 { font-size: 23px; font-weight: 400; line-height: 1.9; letter-spacing: .08em; }
.company-layout h3 span { white-space: nowrap; }
.company-copy { margin-top: 24px; font-size: 14px; line-height: 2.2; letter-spacing: .05em; }
.company-profile { padding-top: 8px; font-size: 13px; line-height: 2.1; letter-spacing: .04em; }
.company-profile > div { display: grid; grid-template-columns: 80px minmax(0,1fr); gap: 24px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.company-profile > div:first-child { border-top: 1px solid var(--line); }
.company-profile dt { color: var(--gray-2); }
.principles { margin-top: 56px; border-top: 1px solid var(--line); }
.principles > summary { margin: 22px auto 0; font-size: 14px; letter-spacing: .1em; padding-right: 40px; }
.principles-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 48px; margin-top: 36px; }
.principle-card h4 { font-size: 15px; font-weight: 500; margin-bottom: 15px; }
.principle-card p { font-size: 13px; line-height: 2.1; }
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 112px; align-items: start; }
.contact-copy { margin-top: 24px; font-size: 13px; line-height: 2.2; letter-spacing: .04em; }
.contact-copy:first-child { margin-top: 0; }
.contact-status { margin-top: 30px; font-size: 13px; line-height: 2; color: var(--gray-2); }
.contact-panel { border-top: 1px solid var(--line); padding: 28px 0 0; }
.contact-panel h3 { font-size: 16px; font-weight: 500; letter-spacing: .08em; }
.contact-panel ul { margin-top: 24px; padding-left: 1.15em; list-style: disc; font-size: 13px; line-height: 2.2; }
.contact-panel li + li { margin-top: 8px; }
.site-footer { background: #fff; padding: 52px 0; color: var(--ink); }
.footer-layout { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 32px; }
.footer-brand img { width: auto; height: 48px; }
.footer-brand p { margin-top: 20px; font-size: 11px; line-height: 2; letter-spacing: .05em; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 20px 28px; font-size: 12px; letter-spacing: .06em; }
.footer-nav a:hover { color: var(--hover); }
.mobile-menu { display: none; }
.mobile-menu summary { display: flex; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; list-style: none; cursor: pointer; }
.mobile-menu summary::-webkit-details-marker { display: none; }
.mobile-menu .menu-close, .mobile-menu[open] .menu-open { display: none; }
.mobile-menu[open] .menu-close { display: block; }
.mobile-nav-links { position: absolute; top: 100%; left: 0; right: 0; display: grid; padding: 12px 24px 24px; background: #fff; border-bottom: 1px solid var(--line); }
.mobile-nav-links a { padding: 15px 0; border-top: 1px solid var(--line); }
@media (min-width: 1600px) { .case-card { gap: 80px; } }
@media (max-width: 1100px) {
  .section-frame { padding: 60px 32px 42px; }
  .service-grid { gap: 30px; }
  .service-card h3 { font-size: 15px; letter-spacing: .08em; }
  .case-card { gap: 36px; padding: 32px; grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr); }
  .case-category { margin-bottom: 26px; }
  .company-layout, .contact-layout { gap: 56px; }
}
@media (max-width: 1023px) { .mobile-menu { display: block; } }
@media (max-width: 767px) {
  .page-section { padding: 72px 0; }
  .section-frame { padding: 56px 24px 38px; }
  .section-heading { min-width: 190px; max-width: calc(100% - 40px); padding: 12px 24px; }
  .section-shell { width: calc(100% - 40px); }
  .h-en { font-size: 18px; }
  .h-jp-tag { font-size: 10px; }
  .service-grid { grid-template-columns: 1fr; gap: 52px; }
  .service-image { aspect-ratio: 1.5; }
  .service-card h3 { font-size: 16px; letter-spacing: .12em; margin: 23px 0 18px; }
  .service-card .card-copy { font-size: 13px; }
  .service-card .content-details { margin-top: 14px; }
  .flow-grid { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 32px 24px; }
  .support-flow > summary { font-size: 13px; }
  .case-list { gap: 32px; }
  .case-card { display: flex; flex-direction: column; align-items: stretch; gap: 24px; padding: 24px 16px; border-radius: 8px; }
  .case-visual { order: -1; }
  .case-copy { padding: 0; }
  .case-card h3 { font-size: 18px; }
  .case-category { margin-bottom: 22px; font-size: 11px; }
  .case-card .card-copy, .case-outcome { font-size: 13px; line-height: 2.1; }
  .case-visual figcaption { font-size: 9px; margin-top: 8px; }
  .company-layout, .contact-layout { grid-template-columns: 1fr; gap: 40px; }
  .company-layout h3 { font-size: 21px; letter-spacing: .04em; }
  .company-copy { font-size: 13px; }
  .company-profile > div { grid-template-columns: 64px minmax(0,1fr); gap: 16px; }
  .principles-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-nav { gap: 18px 24px; }
  .site-footer { padding: 40px 0; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }