/* TOP部分改修。既存ページの色・書体・余白を使用する。 */
.first-view {
  position: relative;
  isolation: isolate;
  color: var(--white);
  background: var(--navy);
}

.first-view-image {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.first-view::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(2, 17, 32, 0.74);
  content: "";
}

.first-view-inner {
  display: flex;
  min-height: min(660px, calc(100svh - 156px));
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding-top: 48px;
  padding-bottom: 48px;
}

.first-view-brand {
  margin-bottom: 22px;
  font-size: 18px;
  font-weight: 800;
}

.first-view h1 {
  max-width: 1050px;
  margin-bottom: 24px;
  color: var(--white);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", Georgia, serif;
  font-size: clamp(46px, 4.85vw, 72px);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.045em;
  text-wrap: balance;
  text-shadow: 0 4px 30px rgba(0, 13, 25, 0.46);
}

.first-view h1 span {
  display: block;
}

.first-view-lead {
  max-width: 730px;
  margin-bottom: 16px;
  font-size: 18px;
}

.first-view-role {
  margin-bottom: 24px;
  font-size: 16px;
}

.first-view-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.first-view-actions .button-primary {
  border-color: #8eafc1;
}

.first-view-actions .button-secondary {
  background: var(--white);
}

.control-tower-copy p {
  margin-bottom: 18px;
}

.control-tower-copy .control-tower-note {
  margin-bottom: 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

/* H1からH2へ変更した既存コピーの表示寸法を保つ。 */
.hero #hero-title {
  max-width: 720px;
  margin-bottom: 16px;
  font-size: 60px;
  line-height: 1.08;
}

.network-diagram {
  margin: 0;
}

@media (min-width: 781px) {
  #network-title { max-width: 13em; }
}

.network-coordinator {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 28px;
  padding: 22px 24px;
  border-top: 3px solid var(--blue);
  color: var(--navy);
  background: var(--soft-blue);
}

.network-coordinator strong {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-size: 26px;
}

.network-coordinator strong span {
  font-size: 16px;
}

.network-coordinator > span {
  font-size: 14px;
  font-weight: 700;
}

.network-flow {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 24px;
  margin: 0;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  list-style: none;
}

.network-flow li {
  position: relative;
  display: flex;
  min-width: 0;
  min-height: 108px;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  border-top: 1px solid var(--line);
  color: var(--navy);
  font-size: 14px;
}

.network-flow strong {
  font-size: 17px;
}

.network-step {
  color: var(--blue);
  font-weight: 800;
}

.network-flow li:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -14px;
  width: 8px;
  height: 8px;
  border-top: 2px solid var(--blue);
  border-right: 2px solid var(--blue);
  transform: rotate(45deg);
  content: "";
}

.network-note {
  margin: 18px 0 34px;
  color: var(--muted);
  font-size: 14px;
}

.network-owner,
.network-partners {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 36px;
}

.network-owner {
  padding-bottom: 28px;
}

.network-partners article {
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.network-roles h3 {
  overflow-wrap: anywhere;
  font-size: 19px;
}

.network-role {
  margin-bottom: 10px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 800;
}

.network-partner-type {
  margin-bottom: 12px;
  color: var(--navy);
  font-size: 15px;
  font-weight: 700;
}

.network-owner > p,
.network-partners article > p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}

.network-roles a {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.network-contact,
.case-contact {
  margin-top: 30px;
}

.case-studies article {
  grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.5fr);
  gap: 30px;
  padding: 28px;
}

.case-studies .case-heading h3 {
  margin-bottom: 12px;
  font-size: 21px;
}

.case-details {
  margin: 0;
  color: var(--muted);
}

.case-details > div {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.case-details > div:first-child {
  padding-top: 0;
  border-top: 0;
}

.case-details > div:last-child {
  padding-bottom: 0;
}

.case-details dt {
  color: var(--navy);
  font-weight: 800;
}

.case-details dd {
  min-width: 0;
  margin: 0;
}

.case-details ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 24px;
  margin: 0;
  padding-left: 1.2em;
}

.company-partner-role {
  display: block;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
}

.first-view a:focus-visible,
.network-roles a:focus-visible,
.network-contact:focus-visible,
.case-contact:focus-visible,
.ocean-story-rail button:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 4px;
}

.ocean-story-fixed-lines.story-delivery-title span {
  white-space: normal;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

@media (max-width: 1280px) {
  .hero #hero-title { font-size: 52px; }
  .site-nav { gap: 12px; }
}

@media (max-width: 1060px) {
  .network-flow { gap: 18px; }
  .network-flow strong { font-size: 15px; }
  .network-flow li { font-size: 13px; }
  .network-flow li:not(:last-child)::after { right: -11px; }
}

@media (max-width: 780px) {
  .first-view-inner {
    min-height: calc(100svh - 140px);
    padding-top: 36px;
    padding-bottom: 36px;
  }
  .first-view h1 { font-size: 38px; line-height: 1.12; }
  .first-view-lead { font-size: 16px; }
  .first-view-brand { margin-bottom: 18px; font-size: 16px; }
  .first-view-role { font-size: 15px; }
  .first-view-actions { width: 100%; }
  .first-view-actions .button { min-height: 48px; }
  .hero #hero-title { font-size: 36px; line-height: 1.22; }
  .control-tower-layout { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .network-coordinator { padding: 20px 16px; }
  .network-flow { grid-template-columns: minmax(0, 1fr); gap: 24px; padding: 24px 0; }
  .network-flow li {
    min-height: 62px;
    flex-flow: row wrap;
    justify-content: flex-start;
    align-items: center;
    gap: 8px 14px;
    padding-top: 12px;
    font-size: 14px;
  }
  .network-flow strong { font-size: 17px; }
  .network-flow li:not(:last-child)::after {
    top: auto;
    right: auto;
    bottom: -13px;
    left: 50%;
    transform: rotate(135deg);
  }
  .network-owner,
  .network-partners { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .network-partners article { padding-top: 24px; }
  .case-studies article { grid-template-columns: minmax(0, 1fr); gap: 20px; padding: 20px; }
  .case-details ul { grid-template-columns: minmax(0, 1fr); }
  .ocean-story-rail { gap: 0; right: 4px; }
  .ocean-story-rail button { width: 44px; height: 44px; }
  .ocean-story-rail button::after { inset: 19px; }
  .ocean-story-rail button.is-active::after { inset: 15px; }
  .ocean-story-copy { right: 52px; }
  .ocean-story-cta,
  .ocean-story-next { min-height: 44px; }
}

@media (max-width: 480px) {
  .first-view h1 { font-size: clamp(24px, 7.9vw, 32px); }
  .hero #hero-title { font-size: 32px; line-height: 1.24; }
  .case-details > div { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .case-studies .case-heading h3 { font-size: 20px; }
  .nav-toggle { width: 44px; height: 44px; }
}