/* Reading layout for the Research overview only. */
.research-overview-hero {
  padding: calc(var(--header-height) + 56px) 0 48px;
}

.physical-ai-intro {
  padding: 56px 0 64px;
}

.physical-ai-intro-grid {
  gap: 48px;
  grid-template-columns: minmax(180px, 0.55fr) minmax(0, 1.45fr);
}

/* This column is narrower than the one site.css sized the heading for, so cap
   the heading to keep "Physical AI" on one line. */
.physical-ai-intro h2 {
  font-size: clamp(2.8rem, 4vw, 3.9rem);
  white-space: nowrap;
}

.physical-ai-intro-copy p,
.research-editorial-copy > p {
  color: var(--ink);
  font-size: 1.0625rem;
  line-height: 1.85;
}

.research-editorial-program {
  padding: 64px 0;
}

.research-editorial-program-heading {
  max-width: none;
  margin-bottom: 28px;
}

.research-editorial-program-heading h2 {
  max-width: none;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  letter-spacing: -0.025em;
  line-height: 1.25;
  text-wrap: wrap;
}

.research-editorial-copy,
.research-editorial-copy.is-single {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  column-count: auto;
  gap: 20px;
  max-width: none;
  width: 100%;
  margin-bottom: 48px;
}

.research-work-heading {
  display: grid;
  gap: 6px;
  margin-bottom: 24px;
}

.research-work-heading p {
  font-size: 1.125rem;
  letter-spacing: 0;
  text-transform: none;
  line-height: 1.5;
}

.research-work-heading span {
  font-size: 0.9375rem;
  line-height: 1.65;
}

.research-topic-grid {
  gap: 24px;
  border: 0;
}

.research-topic-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.research-topic-copy {
  flex: 1;
  min-height: 0;
  padding: 28px;
}

.research-topic-attribution {
  font-size: 0.8125rem;
  letter-spacing: 0.015em;
  line-height: 1.6;
  text-transform: none;
}

.research-topic-copy h3 {
  margin: 12px 0;
  font-size: 1.375rem;
  letter-spacing: -0.015em;
  line-height: 1.35;
}

.research-topic-copy > p:not(.research-topic-attribution) {
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.8;
}

.research-topic-copy > a {
  padding-top: 24px;
  font-size: 0.9375rem;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.research-editorial-outputs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 28px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg-alt);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.research-editorial-outputs strong {
  flex-basis: 100%;
  margin-bottom: 4px;
}

.research-editorial-outputs a {
  max-width: 100%;
  margin: 0;
  padding-block: 4px;
  color: var(--navy);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 4px;
  overflow-wrap: anywhere;
}

.research-editorial-outputs a:hover {
  text-decoration-color: currentColor;
}

.research-choices {
  padding: 40px 0 48px;
  background: var(--bg-alt);
  border-block: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-height) + 16px);
}

.research-choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-auto-rows: 1fr;
  gap: 16px;
  margin-top: 20px;
}

.research-choice {
  position: relative;
  display: grid;
  align-content: center;
  gap: 8px;
  min-height: 260px;
  padding: 24px 64px 24px 28px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--navy);
  isolation: isolate;
  overflow: hidden;
  transition: background 160ms ease, border-color 160ms ease;
}

.research-choice-number {
  color: var(--white);
  font-size: 0.8125rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.research-choice-title {
  color: var(--white);
  font-size: clamp(1.0625rem, 1.8vw, 1.4rem);
  font-weight: 650;
  line-height: 1.4;
  letter-spacing: -0.02em;
}

.research-choice-arrow {
  position: absolute;
  right: 24px;
  top: 28px;
  color: var(--white);
  font-size: 1.5rem;
}

.research-choice:hover {
  border-color: var(--blue);
}

.research-choice.is-active {
  border-color: var(--cyan);
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

.research-choice:focus-visible {
  outline: 3px solid var(--navy);
  outline-offset: 4px;
}

.research-choice-video {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 300ms ease;
}

.research-choice::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  content: "";
  background: linear-gradient(110deg, rgba(3, 18, 35, 0.88), rgba(3, 18, 35, 0.65) 65%, rgba(3, 18, 35, 0.5));
}

.research-choice-title,
.research-choice-number {
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.research-choice:hover .research-choice-video {
  transform: scale(1.035);
}

.research-demo-toggle {
  display: block;
  margin: 12px 0 0 auto;
  padding: 6px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  color: var(--navy);
  background: var(--white);
  font-size: 0.8125rem;
  cursor: pointer;
}

.research-demo-toggle[hidden] { display: none; }

@media (prefers-reduced-motion: reduce) {
  .research-choice-video { transition: none; }
  .research-choice:hover .research-choice-video { transform: none; }
}

.research-choice.is-active > span {
  color: var(--white);
}

.research-editorial-program {
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.research-editorial-program[hidden] {
  display: none;
}

.research-back-to-grid {
  display: inline-flex;
  margin-bottom: 28px;
  padding: 8px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  color: var(--navy);
  font-size: 0.9375rem;
  font-weight: 600;
}

.research-back-to-grid:hover {
  background: var(--bg-blue);
}

@media (max-width: 900px) {
  .physical-ai-intro-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

}

@media (max-width: 700px) {
  .research-overview-shell,
  .research-editorial-shell {
    width: calc(100% - 40px);
  }

  .research-choice {
    min-height: 300px;
    padding: 18px 14px;
    align-content: center;
  }

  .research-choice-arrow {
    top: 12px;
    right: 12px;
    font-size: 1.1rem;
  }

  .research-choice-grid {
    gap: 12px;
  }

  .research-overview-hero {
    padding: calc(var(--header-height) + 36px) 0 36px;
  }

  .physical-ai-intro,
  .research-editorial-program {
    padding-block: 40px;
  }

  .research-topic-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .research-topic-copy,
  .research-editorial-outputs {
    padding: 20px;
  }

  .research-editorial-outputs {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}