.ia-hero,
.ia-intro,
.ia-map,
.ia-guide {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}

.ia-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
  gap: clamp(48px, 8vw, 112px);
  align-items: end;
  padding-block: clamp(96px, 12vw, 152px) clamp(72px, 9vw, 112px);
}

.ia-hero h1 {
  max-width: 760px;
  margin: 24px 0 0;
  font-size: clamp(42px, 6vw, 72px);
  font-weight: 600;
  letter-spacing: -0.055em;
  line-height: 0.98;
  text-wrap: balance;
}

.ia-hero-lede {
  max-width: 470px;
  margin: 0 0 6px;
  color: var(--text);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.55;
}

.ia-intro {
  display: grid;
  grid-template-columns: minmax(220px, 0.55fr) minmax(0, 1fr);
  gap: clamp(40px, 8vw, 120px);
  padding-block: 72px;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.ia-intro h2,
.ia-guide h2 {
  margin: 0;
  font-size: clamp(28px, 3.4vw, 42px);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.1;
  text-wrap: balance;
}

.ia-intro p,
.ia-guide > div > p {
  max-width: 720px;
  margin: 0;
  color: var(--text);
  font-size: 18px;
  line-height: 1.7;
}

.ia-map {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: clamp(48px, 8vw, 112px);
  padding-block: 96px 120px;
}

.ia-index {
  position: sticky;
  top: 96px;
  align-self: start;
}

.ia-index > p,
.ia-guide-label {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ia-index ol {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.ia-index a {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  min-height: 44px;
  padding: 10px 0;
  color: var(--text);
  font-size: 14px;
  line-height: 1.35;
}

.ia-index a:hover {
  color: var(--ink);
}

.ia-index a > span:first-child {
  color: var(--quiet);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.ia-ledger {
  min-width: 0;
  border-top: 1px solid var(--line-strong);
}

.ia-entry {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 24px;
  padding-block: clamp(48px, 7vw, 76px);
  border-bottom: 1px solid var(--line-soft);
  scroll-margin-top: 96px;
}

.ia-number {
  padding-top: 7px;
  color: var(--quiet);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.ia-entry h2 {
  max-width: 680px;
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 1.05;
  text-wrap: balance;
}

.ia-entry-body {
  max-width: 720px;
  margin: 24px 0 0;
  color: var(--text);
  font-size: 18px;
  line-height: 1.7;
}

.ia-proof {
  max-width: 720px;
  margin: 28px 0 0;
  padding-left: 20px;
  border-left: 2px solid var(--line-strong);
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
}

.ia-proof strong {
  color: var(--ink);
  font-weight: 600;
}

.ia-entry-link {
  display: inline-flex;
  width: fit-content;
  min-height: 44px;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
  font-size: 15px;
  font-weight: 600;
}

.ia-guide {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: clamp(40px, 8vw, 112px);
  padding-block: 80px;
  border-top: 1px solid var(--line-strong);
}

.ia-guide > div {
  display: grid;
  gap: 24px;
}

.ia-guide-note {
  padding-top: 24px;
  border-top: 1px solid var(--line-soft);
  color: var(--muted) !important;
  font-size: 15px !important;
}

.solution-lenses {
  display: grid;
  grid-template-columns: minmax(260px, 0.75fr) minmax(0, 1.25fr);
  gap: clamp(48px, 8vw, 112px);
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto 96px;
  padding-block: 72px;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.solution-lenses-copy h2 {
  margin: 0;
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.1;
  text-wrap: balance;
}

.solution-lenses-copy p {
  margin: 24px 0 0;
  color: var(--text);
  font-size: 17px;
  line-height: 1.65;
}

.solution-lens-links {
  border-top: 1px solid var(--line-soft);
}

.solution-lens-links > a {
  display: grid;
  grid-template-columns: minmax(120px, 0.45fr) minmax(0, 1fr) 24px;
  gap: 24px;
  align-items: start;
  min-height: 88px;
  padding-block: 24px;
  border-bottom: 1px solid var(--line-soft);
}

.solution-lens-links strong {
  font-size: 16px;
  font-weight: 600;
}

.solution-lens-links a > span {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.solution-lens-links i {
  font-style: normal;
  transition: transform 160ms ease;
}

.solution-lens-links a:hover i {
  transform: translateX(4px);
}

@media (max-width: 820px) {
  .ia-hero,
  .ia-intro,
  .ia-guide {
    grid-template-columns: 1fr;
  }

  .ia-hero {
    gap: 36px;
    padding-block: 80px 72px;
  }

  .ia-map {
    grid-template-columns: 1fr;
    gap: 48px;
    padding-block: 72px 96px;
  }

  .ia-index {
    position: static;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--line-soft);
  }

  .solution-lenses {
    grid-template-columns: 1fr;
  }

  .ia-index ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 24px;
  }
}

@media (max-width: 560px) {
  .ia-hero,
  .ia-intro,
  .ia-map,
  .ia-guide {
    width: min(100% - 40px, 1120px);
  }

  .ia-hero h1 {
    font-size: clamp(38px, 12vw, 52px);
  }

  .ia-intro {
    gap: 24px;
    padding-block: 56px;
  }

  .ia-map {
    gap: 36px;
    padding-block: 64px 80px;
  }

  .ia-index ol {
    grid-template-columns: 1fr;
  }

  .ia-entry {
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 12px;
    padding-block: 48px;
  }

  .ia-entry h2 {
    font-size: 32px;
  }

  .ia-entry-body {
    font-size: 17px;
  }

  .ia-guide {
    gap: 12px;
    padding-block: 64px;
  }

  .solution-lenses {
    width: min(100% - 40px, 1120px);
    gap: 40px;
    margin-bottom: 72px;
    padding-block: 56px;
  }

  .solution-lens-links > a {
    grid-template-columns: 1fr 24px;
    gap: 8px 16px;
  }

  .solution-lens-links a > span {
    grid-column: 1;
  }

  .solution-lens-links i {
    grid-column: 2;
    grid-row: 1 / span 2;
  }
}