/* Research overview and direction detail (PT-18). Owner: public-shell.
 *
 * Overview composition references the DeepMind research index: one editorial statement,
 * then dense card sections. Result cards keep images card-sized (16:10, max ~400px) and
 * carry meta, summary, tags and an explicit action — never full-width photo stacks.
 */

.research-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding-block: clamp(40px, 5vw, 72px) clamp(16px, 2vw, 28px);
  text-align: center;
}

.research-hero__eyebrow {
  margin: 0;
  font-size: var(--text-caption);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-3);
}

.research-hero__title {
  max-width: 24ch;
  margin: 0;
  font-size: clamp(34px, 4.1vw, 58px);
  font-weight: var(--weight-semibold);
  line-height: 1.06;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.research-hero__lead {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(17px, 1.25vw, 19px);
  line-height: 1.55;
  color: var(--color-ink-2);
  text-wrap: pretty;
}

.research-hero__stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin: 4px 0 0;
  font-size: var(--text-body-s);
  color: var(--color-ink-3);
}

.research-section {
  padding-top: var(--section-y);
}

.research-section .section-header {
  margin-bottom: 12px;
}

.research-section__lead {
  max-width: 68ch;
  margin: 0 0 var(--space-8);
  font-size: var(--text-body-s);
  line-height: 1.55;
  color: var(--color-ink-2);
}

/* Directions: three text-forward cards instead of bare rows. */
.research-overview .directions__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.research-overview .research-section:first-of-type {
  padding-top: clamp(40px, 4vw, 60px);
}

.research-overview .direction-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 220px;
  padding: 24px;
  border: var(--border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  transition: border-color var(--dur-fast) var(--ease-standard), background-color var(--dur-fast) var(--ease-standard);
}

.research-overview .direction-card:hover {
  border-color: var(--color-line-strong);
  background: var(--color-surface-hover);
}

.research-direction__index {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-ink-3);
}

.research-overview .direction-card__title {
  padding-right: 0;
  font-size: clamp(20px, 1.7vw, 24px);
}

.research-overview .direction-card__summary {
  max-width: 34ch;
  font-size: 15px;
  line-height: 1.55;
}

.research-direction__more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  padding-top: 14px;
  font-size: 13px;
  font-weight: var(--weight-medium);
  color: var(--color-ink-1);
  text-decoration: none;
}

.research-direction__more:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* Featured results: three equal cards with modest media and a full text block. */
.research-results__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px 24px;
  align-items: stretch;
}

.research-result {
  min-width: 0;
}

.research-result__link {
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  color: inherit;
}

.research-result__media {
  display: block;
  overflow: hidden;
  border-radius: var(--radius-card);
  background: var(--color-surface);
}

.media__img--research {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: inherit;
}

.research-result__body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 8px;
  padding-top: 16px;
}

.research-result__meta {
  font-size: var(--text-caption);
  letter-spacing: 0.02em;
  color: var(--color-ink-3);
}

.research-result__title {
  margin: 0;
  font-size: clamp(20px, 1.55vw, 23px);
  font-weight: var(--weight-semibold);
  line-height: 1.2;
  text-wrap: balance;
}

.research-result__link:hover .research-result__title {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.research-result__summary {
  margin: 0;
  font-size: 15px;
  line-height: 1.55;
  color: var(--color-ink-2);
}

.research-result__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 2px;
}

.research-result__tag {
  padding: 4px 9px;
  border: var(--border);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-ink-2);
}

.research-result__more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  padding-top: 14px;
  font-size: 13px;
  font-weight: var(--weight-medium);
  color: var(--color-ink-1);
}

.research-result__link:hover .research-result__more {
  color: var(--color-ink-2);
}

/* Direction detail keeps its existing hierarchy; only spacing is shared. */
.direction-page__header {
  padding-block: var(--space-10) var(--space-6);
}

.direction-page__overview {
  padding-top: var(--space-8);
}

.direction-page section[id],
.direction-page #overview {
  scroll-margin-top: var(--anchor-offset-subnav);
}

.direction-page__subhead {
  margin: var(--space-8) 0 var(--space-4);
  font-size: var(--text-body-s);
  font-weight: var(--weight-semibold);
  color: var(--color-ink-2);
}

.direction-page__subhead:first-of-type {
  margin-top: 0;
}

.direction-page .project-list {
  margin-top: var(--space-4);
}

.direction-page .bibliography-list {
  border-bottom: var(--border);
}

.direction-page__cta {
  margin-top: var(--section-y);
}

.research-overview__join {
  margin-top: var(--section-y);
  padding-top: var(--space-10);
  border-top: var(--border);
}

.research-overview__join-text {
  max-width: 60ch;
  margin-top: 12px;
  font-size: var(--text-body-s);
  color: var(--color-ink-2);
}

.research-overview__join-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: var(--space-6);
}

@media (max-width: 1100px) {
  .research-results__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .research-hero {
    align-items: flex-start;
    padding-block: var(--space-8) var(--space-6);
    text-align: left;
  }

  .research-hero__title {
    max-width: 100%;
    font-size: clamp(30px, 8.6vw, 40px);
  }

  .research-hero__lead {
    font-size: 16px;
  }

  .research-hero__stats {
    justify-content: flex-start;
  }

  .research-section {
    padding-top: var(--space-10);
  }

  .research-section__lead {
    margin-bottom: var(--space-6);
  }

  .research-overview .directions__grid,
  .research-results__grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .research-overview .direction-card {
    min-height: 0;
  }

  .direction-page__header {
    padding-block: var(--space-6) var(--space-4);
  }
}

/* ---------------------------------------------------------------- direction / focus area
 *
 * Composition follows the IBM Research focus-area page: a quiet sticky section rail,
 * an editorial hero with an abstract visual, then dense text-first work cards. The
 * direction page deliberately avoids the full-width photo stacks used elsewhere.
 */

.focus-page {
  padding-top: clamp(18px, 2.4vw, 32px);
}

.focus-grid {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
}

.focus-rail {
  position: sticky;
  top: var(--anchor-offset);
  min-width: 0;
  padding-right: 24px;
}

.focus-rail__nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-left: var(--border);
}

.focus-rail__link {
  position: relative;
  display: block;
  padding: 8px 0 8px 18px;
  font-size: 15px;
  line-height: 1.4;
  color: var(--color-ink-2);
  text-decoration: none;
}

.focus-rail__link:hover {
  color: var(--color-ink);
}

.focus-rail__link.anchor-nav__link--active {
  color: var(--color-ink);
  font-weight: var(--weight-semibold);
}

.focus-rail__link.anchor-nav__link--active::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: -1px;
  width: 2px;
  background: var(--color-ink);
}

.focus-rail__foot {
  margin-top: 32px;
  padding-top: 20px;
  border-top: var(--border);
}

.focus-main {
  min-width: 0;
}

.focus-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 360px);
  gap: clamp(32px, 4vw, 64px);
  align-items: center;
  padding-bottom: clamp(32px, 4vw, 56px);
  border-bottom: var(--border);
}

.focus-hero__text {
  min-width: 0;
}

.focus-hero__title {
  max-width: 16ch;
  margin: 14px 0 0;
  font-size: clamp(44px, 5.2vw, 76px);
  font-weight: var(--weight-semibold);
  line-height: 0.98;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.focus-hero__statement {
  max-width: 32ch;
  margin: 20px 0 0;
  font-size: clamp(18px, 1.7vw, 24px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-style: italic;
  color: var(--color-ink);
}

.focus-hero__lead {
  max-width: 58ch;
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-ink-2);
}

.focus-hero__stats {
  margin: 18px 0 0;
  font-size: var(--text-body-s);
  color: var(--color-ink-3);
}

.focus-hero__visual {
  position: relative;
  width: 100%;
  max-width: 360px;
  aspect-ratio: 1;
  justify-self: end;
  overflow: hidden;
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 28%, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0) 46%),
    linear-gradient(112deg, #191b1f 0%, #3a3f47 42%, #c9d1db 54%, #f7f9fb 100%);
}

.focus-hero__ring {
  position: absolute;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 50%;
}

.focus-hero__ring--outer {
  inset: 8%;
}

.focus-hero__ring--inner {
  inset: 26%;
}

.focus-section {
  padding-top: clamp(36px, 4vw, 56px);
  scroll-margin-top: var(--anchor-offset-subnav);
}

.focus-section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 16px;
  margin-bottom: 20px;
  border-bottom: var(--border);
}

.focus-section__title {
  margin: 0;
  font-size: clamp(28px, 2.4vw, 38px);
  font-weight: var(--weight-semibold);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.focus-section__all {
  flex: none;
  font-size: 14px;
  font-weight: var(--weight-medium);
  color: var(--color-ink-2);
  text-decoration: none;
}

.focus-section__all:hover {
  color: var(--color-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.focus-section__lead {
  max-width: 68ch;
  margin: -4px 0 24px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--color-ink-2);
}

.focus-section__subhead {
  margin: 32px 0 14px;
  font-size: var(--text-body-s);
  font-weight: var(--weight-semibold);
  color: var(--color-ink-2);
}

.focus-work-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  align-items: stretch;
}

.focus-work-card {
  display: flex;
  min-width: 0;
  border: var(--border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  transition: border-color var(--dur-fast) var(--ease-standard), background-color var(--dur-fast) var(--ease-standard);
}

.focus-work-card:hover {
  border-color: var(--color-line-strong);
  background: var(--color-surface-hover);
}

.focus-work-card__link {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  min-height: 260px;
  padding: 24px;
  text-decoration: none;
  color: inherit;
}

.focus-work-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.focus-work-card__type {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-3);
}

.focus-work-card__title {
  margin: 0;
  font-size: clamp(20px, 1.7vw, 24px);
  font-weight: var(--weight-semibold);
  line-height: 1.2;
  text-wrap: balance;
}

.focus-work-card__link:hover .focus-work-card__title {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.focus-work-card__summary {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--color-ink-2);
}

.focus-work-card__foot {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
  padding-top: 16px;
}

.focus-work-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.focus-work-card__tag {
  padding: 4px 9px;
  border: var(--border);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-ink-2);
}

.focus-work-card__more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: var(--weight-medium);
  color: var(--color-ink-1);
}

.focus-work-more {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 260px;
  padding: 24px;
  border-radius: var(--radius-card);
  background: var(--color-ink);
  color: var(--color-bg);
  text-decoration: none;
}

.focus-work-more__label {
  max-width: 14ch;
  font-size: clamp(22px, 2vw, 28px);
  font-weight: var(--weight-semibold);
  line-height: 1.15;
}

.focus-work-more__arrow {
  align-self: flex-end;
  font-size: 30px;
  line-height: 1;
}

.focus-work-more:hover .focus-work-more__label {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.focus-team {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 28px;
}

.focus-section .bibliography-list {
  border-top: var(--border);
}

.focus-section .vacancy-list {
  margin-top: 4px;
}

.focus-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  margin-top: clamp(48px, 6vw, 80px);
  padding: clamp(24px, 3vw, 40px);
  border-radius: var(--radius-panel);
  background: var(--color-ink);
  color: var(--color-bg);
}

.focus-cta__text {
  min-width: 0;
}

.focus-cta__title {
  margin: 0;
  font-size: clamp(24px, 2.2vw, 32px);
  font-weight: var(--weight-semibold);
  line-height: 1.15;
}

.focus-cta__body {
  max-width: 56ch;
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.72);
}

.focus-cta__link {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: var(--weight-medium);
  color: var(--color-bg);
  text-decoration: none;
}

.focus-cta__link:hover {
  background: var(--color-bg);
  color: var(--color-ink);
}

@media (max-width: 1100px) {
  .focus-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .focus-rail {
    position: static;
    padding-right: 0;
  }

  .focus-rail__nav {
    flex-direction: row;
    gap: 20px;
    overflow-x: auto;
    padding-bottom: 10px;
    border-left: 0;
    border-bottom: var(--border);
    scrollbar-width: none;
  }

  .focus-rail__nav::-webkit-scrollbar {
    display: none;
  }

  .focus-rail__link {
    flex: none;
    padding: 0;
    white-space: nowrap;
  }

  .focus-rail__link.anchor-nav__link--active::before {
    top: auto;
    bottom: -11px;
    left: 0;
    right: 0;
    width: auto;
    height: 2px;
  }

  .focus-rail__foot {
    display: none;
  }

  .focus-work-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .focus-page {
    padding-top: var(--space-4);
  }

  .focus-hero {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-6);
    align-items: start;
  }

  .focus-hero__title {
    max-width: 100%;
    font-size: clamp(38px, 10.5vw, 54px);
  }

  .focus-hero__statement {
    max-width: 100%;
    font-size: 20px;
  }

  .focus-hero__visual {
    width: 180px;
    max-width: 60%;
    justify-self: start;
  }

  .focus-section {
    padding-top: var(--space-10);
  }

  .focus-section__head {
    align-items: flex-start;
    gap: 12px;
  }

  .focus-section__title {
    font-size: 26px;
  }

  .focus-work-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .focus-work-card__link {
    min-height: 0;
  }

  .focus-work-more {
    min-height: 160px;
  }

  .focus-team {
    grid-template-columns: minmax(0, 1fr);
  }

  /* Reading order in a focus area is title → type → authors, not the catalogue's
     date-first row. */
  .focus-main .bibliography-row__meta-col {
    order: 0;
  }

  .focus-main .bibliography-row__actions {
    order: 2;
  }

  .focus-cta {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }
}

/* Animated orbit field in the research overview whitespace. */
.research-hero {
  position: relative;
  isolation: isolate;
}

.research-hero__ambient {
  top: 50%;
  width: clamp(260px, 25vw, 360px);
  opacity: 0.85;
  transform: translateY(-50%);
}

.research-hero__ambient--left {
  left: -24px;
}

.research-hero__ambient--right {
  right: -24px;
}

.research-hero > :not(.ambient-art) {
  position: relative;
  z-index: 1;
}

/* Animated orbits on the focus-area abstract disc. */
.focus-hero__visual {
  isolation: isolate;
}

.focus-hero__visual::after {
  content: "";
  position: absolute;
  inset: -8%;
  z-index: 0;
  background: radial-gradient(circle at 32% 28%, rgba(255, 255, 255, 0.4), transparent 46%);
  animation: focus-glow-drift 14s ease-in-out infinite alternate;
  pointer-events: none;
}

.focus-hero__orbit {
  position: absolute;
  z-index: 2;
  border-radius: 50%;
  pointer-events: none;
  transform-origin: 50% 50%;
}

.focus-hero__orbit--outer {
  inset: 11%;
  border: 1px dashed rgba(255, 255, 255, 0.4);
  animation: focus-orbit-spin 30s linear infinite;
}

.focus-hero__orbit--inner {
  inset: 27%;
  border: 1px solid rgba(255, 255, 255, 0.26);
  animation: focus-orbit-spin 20s linear infinite reverse;
}

.focus-hero__node {
  position: absolute;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 14px rgba(255, 255, 255, 0.9);
  animation: focus-node-pulse 5s ease-in-out infinite;
}

.focus-hero__node--a {
  top: -3px;
  left: 50%;
  transform: translateX(-50%);
}

.focus-hero__node--b {
  bottom: -3px;
  left: 50%;
  transform: translateX(-50%);
  width: 5px;
  height: 5px;
  animation-delay: -2.2s;
}

.focus-hero__node--c {
  top: 50%;
  right: -3px;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  animation-delay: -3.6s;
}

@keyframes focus-orbit-spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes focus-node-pulse {
  0%,
  100% {
    opacity: 0.5;
  }
  50% {
    opacity: 1;
  }
}

@keyframes focus-glow-drift {
  from {
    transform: translate3d(-2%, -1%, 0) scale(0.98);
  }
  to {
    transform: translate3d(2%, 2%, 0) scale(1.04);
  }
}

@media (prefers-reduced-motion: reduce) {
  .focus-hero__orbit,
  .focus-hero__node,
  .focus-hero__visual::after {
    animation: none !important;
  }
}

@media (max-width: 1199px) {
  .research-hero__ambient {
    width: 280px;
    opacity: 0.45;
  }
}

@media (max-width: 900px) {
  .research-hero__ambient {
    display: none;
  }
}

/* Join CTA: text on the left, animated MWS panel fills the empty right side. */
.research-overview__join {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 380px);
  gap: clamp(40px, 7vw, 88px);
  align-items: center;
}

.research-overview__join-copy {
  min-width: 0;
}

.research-overview__join-visual {
  min-width: 0;
}

@media (max-width: 900px) {
  .research-overview__join {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .research-overview__join-visual {
    display: none;
  }
}