.kansoku-hero {
  min-height: min(100svh, 920px);
}

.observation-report,
.water-route,
.findings,
.method-note,
.research-link {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
}

.observation-report,
.water-route,
.findings,
.method-note {
  padding: clamp(72px, 10vw, 132px) 0;
  border-top: 1px solid var(--line);
}

.report-kicker {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 10px;
  letter-spacing: .18em;
}

.report-intro,
.section-copy {
  display: grid;
  grid-template-columns: minmax(250px, .85fr) minmax(0, 1.15fr);
  gap: clamp(30px, 7vw, 100px);
  align-items: start;
}

.report-intro .report-kicker,
.section-copy .report-kicker {
  grid-column: 1 / -1;
  margin-bottom: -4px;
}

.report-intro h2,
.section-copy h2,
.method-note h2,
.research-link h2 {
  margin: 0;
  font-size: clamp(30px, 4.5vw, 58px);
  line-height: 1.45;
  letter-spacing: .025em;
}

.report-intro > p:last-child,
.section-copy > p:last-child,
.method-body p,
.research-link p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 2.1;
}

.observation-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: clamp(54px, 8vw, 92px);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 5px 5px 0 rgba(69, 62, 51, .12);
}

.observation-metrics > div {
  min-height: 190px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-right: 1px solid var(--line);
}

.observation-metrics > div:last-child { border-right: 0; }
.observation-metrics strong { color: var(--accent); font-size: clamp(34px, 4vw, 56px); line-height: 1; letter-spacing: -.03em; }
.observation-metrics span { color: var(--muted); font-size: 11px; line-height: 1.8; }

.route-diagram {
  margin: clamp(52px, 7vw, 82px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border: 1px solid var(--line);
  background: #e7f0f3;
  list-style: none;
}

.route-diagram li {
  position: relative;
  min-height: 178px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line);
}

.route-diagram li:last-child { border-right: 0; }
.route-diagram li:not(:last-child)::after { content: "→"; position: absolute; top: 50%; right: -12px; z-index: 1; width: 24px; height: 24px; display: grid; place-items: center; background: #e7f0f3; font-size: 15px; transform: translateY(-50%); }
.route-diagram span { color: var(--accent); font-size: 9px; letter-spacing: .14em; }
.route-diagram strong { margin-top: auto; font-size: 14px; line-height: 1.65; }
.route-diagram small { margin-top: 8px; color: var(--muted); font-size: 10px; line-height: 1.5; }

.findings-heading { margin-bottom: clamp(46px, 7vw, 80px); }
.finding-grid { display: grid; grid-template-columns: repeat(2, 1fr); border: 1px solid var(--line); background: var(--surface); box-shadow: 5px 5px 0 rgba(69, 62, 51, .12); }
.finding-grid article { min-height: 260px; padding: clamp(28px, 4vw, 46px); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.finding-grid article:nth-child(2n) { border-right: 0; }
.finding-grid article:nth-last-child(-n+2) { border-bottom: 0; }
.finding-grid span { color: var(--accent); font-size: 10px; letter-spacing: .16em; }
.finding-grid h3 { margin: 42px 0 0; font-size: clamp(18px, 2vw, 24px); line-height: 1.6; }
.finding-grid p { margin: 18px 0 0; color: var(--muted); font-size: 12px; line-height: 2; }

.method-note { display: grid; grid-template-columns: minmax(260px, .8fr) minmax(0, 1.2fr); gap: clamp(40px, 8vw, 110px); }
.method-body { padding-top: 40px; border-top: 1px solid var(--line); }
.method-body p + p { margin-top: 24px; }

.research-link {
  margin-bottom: clamp(72px, 10vw, 132px);
  padding: clamp(40px, 6vw, 72px);
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, .65fr);
  gap: clamp(36px, 7vw, 94px);
  align-items: end;
  border: 1px solid var(--line);
  background: #dcecf1;
  box-shadow: 5px 5px 0 rgba(69, 62, 51, .12);
}

.research-link p { margin-top: 24px; max-width: 660px; }
.research-button { min-height: 132px; padding: 20px; display: flex; flex-direction: column; justify-content: space-between; border: 1px solid var(--ink); background: var(--ink); color: #fff; text-decoration: none; }
.research-button span { font-size: 10px; letter-spacing: .12em; }
.research-button strong { font-size: 14px; text-align: right; }
.store-note { text-decoration: none; }

@media (max-width: 850px) {
  .observation-metrics { grid-template-columns: repeat(2, 1fr); }
  .observation-metrics > div:nth-child(2) { border-right: 0; }
  .observation-metrics > div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .route-diagram { grid-template-columns: 1fr; }
  .route-diagram li { min-height: 112px; border-right: 0; border-bottom: 1px solid var(--line); }
  .route-diagram li:last-child { border-bottom: 0; }
  .route-diagram li:not(:last-child)::after { content: "↓"; top: auto; right: 24px; bottom: -12px; transform: none; }
  .research-link { grid-template-columns: 1fr; }
}

@media (max-width: 650px) {
  .observation-report,
  .water-route,
  .findings,
  .method-note { padding: 72px 0; }
  .report-intro,
  .section-copy,
  .method-note { grid-template-columns: 1fr; gap: 24px; }
  .report-intro .report-kicker,
  .section-copy .report-kicker { margin-bottom: 0; }
  .observation-metrics > div { min-height: 150px; padding: 21px 17px; }
  .finding-grid { grid-template-columns: 1fr; }
  .finding-grid article { min-height: 230px; border-right: 0; border-bottom: 1px solid var(--line); }
  .finding-grid article:nth-last-child(2) { border-bottom: 1px solid var(--line); }
  .method-body { padding-top: 28px; }
  .research-link { width: calc(100% - 36px); padding: 28px 22px; }
}