/* Case study — landing section */

.case-study__landing {
  padding: var(--header-h) var(--pad-x) clamp(6rem, 12vh, 10rem);
}

.case-study__inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.case-study__hero {
  margin-bottom: clamp(2.5rem, 5vh, 4rem);
}

.case-study__hero img,
.case-study__hero-placeholder {
  width: 100%;
  border-radius: clamp(1.5rem, 2.5vw, 2.667rem);
}

.case-study__hero img {
  height: auto;
  display: block;
}

.case-study__hero-placeholder {
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.case-study__hero-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--fs-label);
  font-weight: var(--fw-medium);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.case-study__hero-placeholder--echo {
  background: linear-gradient(135deg, #1a0a0a 0%, #3d1515 50%, #0d0d0d 100%);
  color: #ffffff66;
}

.case-study__hero-placeholder--kotuitui {
  background: linear-gradient(180deg, #b8e635 0%, #1a8a7a 100%);
  color: #03071e66;
}

.case-study__hero-placeholder--cleverly {
  background: linear-gradient(135deg, #e8e4df 0%, #c9c4bc 100%);
  color: #03071e55;
}

.case-study__title {
  font-size: var(--fs-subheading);
  font-weight: var(--fw-semibold);
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: clamp(2.5rem, 5vh, 4rem);
}

.case-study__meta {
  display: grid;
  grid-template-columns: 7fr 7fr 3fr 2fr;
  gap: clamp(2rem, 4vw, 4.167rem);
}

.case-study__meta-col h2 {
  font-size: var(--fs-body2);
  font-weight: var(--fw-semibold);
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
}

.case-study__meta-col p,
.case-study__meta-col li {
  font-size: var(--fs-text);
  line-height: 1.5;
  color: var(--color-text);
}

.case-study__meta-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

/* Case study — content sections */

.case-study__section {
  padding: clamp(4rem, 8vh, 7rem) var(--pad-x);
  border-top: 1px solid var(--color-border);
}

.case-study__section--last {
  padding-bottom: clamp(6rem, 12vh, 10rem);
}

.case-study__section-head {
  max-width: 52ch;
  margin-bottom: clamp(2.5rem, 5vh, 4rem);
}

.case-study__heading {
  font-size: var(--fs-body1);
  font-weight: var(--fw-semibold);
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 1.25rem;
}

.case-study__lead {
  font-size: var(--fs-text);
  line-height: 1.55;
  color: var(--color-text);
}

.case-study__grid {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.667rem);
}

.case-study__grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.case-study__stack {
  display: flex;
  flex-direction: column;
  gap: clamp(1.5rem, 3vw, 2.667rem);
}

.case-study__figure {
  margin: 0;
}

.case-study__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: clamp(1rem, 2vw, 1.667rem);
}

.case-study__figure--video {
  position: relative;
  aspect-ratio: 1354 / 762;
  overflow: hidden;
  border-radius: clamp(1rem, 2vw, 1.667rem);
  cursor: pointer;
}

.case-study__figure--video.is-paused::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: rgb(0 0 0 / 0.18);
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.25s ease;
}

.case-study__figure--video.is-playing::after {
  opacity: 0;
}

.case-study__video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
  background: #000;
}

.case-study__video-controls {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
}

.case-study__video-center-toggle,
.case-study__video-bar,
.case-study__video-bar button,
.case-study__video-bar input {
  pointer-events: auto;
}

.case-study__video-center-toggle {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) scale(0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  width: clamp(3.5rem, 8vw, 5rem);
  height: clamp(3.5rem, 8vw, 5rem);
  padding: 0;
  border: none;
  border-radius: 50%;
  background: rgb(0 0 0 / 0.55);
  color: #fff;
  cursor: pointer;
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.28s ease,
    transform 0.28s ease,
    background 0.2s ease;
}

.case-study__figure--video:not(.is-ui-visible):not(.is-controls-visible) .case-study__video-center-toggle {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -50%) scale(0.92);
}

.case-study__figure--video.is-ui-visible .case-study__video-center-toggle,
.case-study__figure--video.is-controls-visible .case-study__video-center-toggle {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, -50%) scale(1);
}

.case-study__video-center-toggle:hover {
  background: rgb(0 0 0 / 0.72);
}

.case-study__video-center-icon {
  display: none;
  width: 42%;
  height: 42%;
}

.case-study__video-center-toggle.is-paused .case-study__video-center-icon--play {
  display: block;
  margin-left: 0.12em;
}

.case-study__video-center-toggle.is-playing .case-study__video-center-icon--pause {
  display: block;
}

.case-study__video-bar {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.2vw, 0.875rem);
  padding: clamp(0.625rem, 1.5vw, 0.875rem) clamp(0.75rem, 1.5vw, 1rem);
  background: linear-gradient(to top, rgb(0 0 0 / 0.82), rgb(0 0 0 / 0.45) 55%, transparent);
  opacity: 0;
  transform: translateY(100%);
  pointer-events: none;
  transition:
    opacity 0.28s ease,
    transform 0.28s ease;
}

.case-study__figure--video:not(.is-ui-visible):not(.is-controls-visible) .case-study__video-bar {
  opacity: 0;
  transform: translateY(100%);
  pointer-events: none;
}

.case-study__figure--video.is-ui-visible .case-study__video-bar,
.case-study__figure--video.is-controls-visible .case-study__video-bar {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.case-study__video-bar-toggle {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: none;
  background: transparent;
  color: #fff;
  cursor: pointer;
}

.case-study__video-bar-icon {
  display: none;
  width: 1.125rem;
  height: 1.125rem;
}

.case-study__video-bar-toggle.is-paused .case-study__video-bar-icon--play {
  display: block;
  margin-left: 0.08em;
}

.case-study__video-bar-toggle.is-playing .case-study__video-bar-icon--pause {
  display: block;
}

.case-study__video-time {
  flex-shrink: 0;
  min-width: 6.5ch;
  font-size: 0.917rem;
  font-variant-numeric: tabular-nums;
  color: rgb(255 255 255 / 0.88);
  white-space: nowrap;
}

.case-study__video-progress {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
}

.case-study__video-seek,
.case-study__video-volume-range {
  width: 100%;
  height: 0.333rem;
  margin: 0;
  appearance: none;
  background: rgb(255 255 255 / 0.28);
  border-radius: 999px;
  cursor: pointer;
}

.case-study__video-seek::-webkit-slider-runnable-track,
.case-study__video-volume-range::-webkit-slider-runnable-track {
  height: 0.333rem;
  background: transparent;
  border-radius: 999px;
}

.case-study__video-seek::-webkit-slider-thumb,
.case-study__video-volume-range::-webkit-slider-thumb {
  appearance: none;
  width: 0.917rem;
  height: 0.917rem;
  margin-top: -0.292rem;
  border: none;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 1px rgb(0 0 0 / 0.15);
}

.case-study__video-seek::-moz-range-track,
.case-study__video-volume-range::-moz-range-track {
  height: 0.333rem;
  background: rgb(255 255 255 / 0.28);
  border: none;
  border-radius: 999px;
}

.case-study__video-seek::-moz-range-thumb,
.case-study__video-volume-range::-moz-range-thumb {
  width: 0.917rem;
  height: 0.917rem;
  border: none;
  border-radius: 50%;
  background: #fff;
}

.case-study__video-volume {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: clamp(5.5rem, 14vw, 8.5rem);
}

.case-study__video-sound {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: none;
  background: transparent;
  color: #fff;
  cursor: pointer;
}

.case-study__video-sound-icon {
  display: none;
  width: 1.125rem;
  height: 1.125rem;
}

.case-study__video-sound.is-muted .case-study__video-sound-icon--muted,
.case-study__video-sound.is-low .case-study__video-sound-icon--low,
.case-study__video-sound.is-high .case-study__video-sound-icon--high {
  display: block;
}

.case-study__video-center-toggle:focus-visible,
.case-study__video-bar-toggle:focus-visible,
.case-study__video-sound:focus-visible,
.case-study__video-seek:focus-visible,
.case-study__video-volume-range:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

@media (max-width: 600px) {
  .case-study__video-time {
    display: none;
  }

  .case-study__video-volume {
    width: clamp(4rem, 16vw, 5.5rem);
  }
}

@media (hover: none) and (pointer: coarse) {
  .case-study__figure--video.is-ui-visible .case-study__video-bar,
  .case-study__figure--video.is-controls-visible .case-study__video-bar {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .case-study__figure--video.is-ui-visible .case-study__video-center-toggle,
  .case-study__figure--video.is-controls-visible .case-study__video-center-toggle {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .case-study__video-bar,
  .case-study__video-center-toggle,
  .case-study__figure--video.is-paused::after {
    transition: none;
  }
}

.case-study__subsection {
  margin-top: clamp(3rem, 6vh, 5rem);
}

.case-study__subsection > .case-study__lead {
  margin-bottom: clamp(2.5rem, 5vh, 4rem);
}

.case-study__grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

/* Research Phase — Figma collage composition */

.case-study__research-composition {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: clamp(0.75rem, 1.5vw, 1.667rem);
  margin-bottom: clamp(1rem, 2vh, 2rem);
}

.case-study__research-item {
  flex-shrink: 0;
  margin: 0;
}

.case-study__research-item img {
  border-radius: clamp(0.5rem, 1vw, 0.833rem);
}

.case-study__research-item--brilliant {
  width: 33%;
  margin-top: 0;
}

.case-study__research-item--duolingo {
  width: 21.25%;
  margin-top: 4.375%;
}

.case-study__research-item--khanmigo {
  width: 35.2%;
  margin-top: 13.54%;
}

.case-study__grid--features {
  margin: clamp(1.5rem, 3vw, 2.667rem) 0;
}

/* Cleverly & Project Echo — dark content sections */

.case-study--cleverly .case-study__dark,
.case-study--echo .case-study__dark,
.case-study--kotuitui .case-study__dark {
  background: #000;
  color: #fff;
}

.case-study--cleverly .case-study__dark .case-study__section,
.case-study--echo .case-study__dark .case-study__section,
.case-study--kotuitui .case-study__dark .case-study__section {
  border-top-color: #ffffff1a;
}

.case-study--cleverly .case-study__dark .case-study__heading,
.case-study--cleverly .case-study__dark .case-study__lead,
.case-study--cleverly .case-study__dark .case-study__credit-text,
.case-study--echo .case-study__dark .case-study__heading,
.case-study--echo .case-study__dark .case-study__lead,
.case-study--echo .case-study__dark .case-study__credit-text,
.case-study--echo .case-study__dark .case-study__attribution,
.case-study--kotuitui .case-study__dark .case-study__heading,
.case-study--kotuitui .case-study__dark .case-study__lead,
.case-study--kotuitui .case-study__dark .case-study__credit-text,
.case-study--kotuitui .case-study__dark .case-study__attribution {
  color: #fff;
}

.case-study--cleverly .case-study__section--flush,
.case-study--echo .case-study__section--flush,
.case-study--kotuitui .case-study__section--flush {
  padding-top: 0;
  border-top: none;
}

.case-study--cleverly .case-study__section--film,
.case-study--echo .case-study__section--film,
.case-study--kotuitui .case-study__section--film {
  padding-top: clamp(4rem, 8vh, 7rem);
  border-top: none;
}

.case-study__attribution {
  font-size: var(--fs-body2);
  font-weight: 200;
  font-style: italic;
  opacity: 0.41;
  margin-top: clamp(0.5rem, 1vh, 0.75rem);
  text-align: right;
}

.case-study__split {
  display: grid;
  gap: 0;
  overflow: hidden;
  border-radius: clamp(1rem, 2vw, 1.667rem);
}

.case-study__split--research {
  grid-template-columns: 40fr 60fr;
}

.case-study__split--equal {
  grid-template-columns: 1fr 1fr;
}

.case-study__split-figure {
  margin: 0;
  overflow: hidden;
}

.case-study__split-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
}

.case-study__split-figure:first-child img {
  border-radius: clamp(1rem, 2vw, 1.667rem) 0 0 clamp(1rem, 2vw, 1.667rem);
}

.case-study__split-figure:last-child img {
  border-radius: 0 clamp(1rem, 2vw, 1.667rem) clamp(1rem, 2vw, 1.667rem) 0;
}

.case-study__heading--credit {
  font-size: var(--fs-subheading);
  margin-bottom: clamp(2rem, 4vh, 3rem);
}

.case-study__credit-text {
  font-size: var(--fs-body1);
  line-height: 1.14;
  letter-spacing: -0.005em;
  max-width: 50ch;
  margin-bottom: clamp(3rem, 6vh, 5rem);
}

.case-study__credit-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(2rem, 4vw, 4rem);
  margin-bottom: clamp(4rem, 8vh, 7rem);
}

.case-study__credit-col h3 {
  font-size: var(--fs-text);
  font-weight: var(--fw-semibold);
  margin-bottom: 1rem;
}

.case-study__credit-col p {
  font-size: var(--fs-text);
  line-height: 1.3;
}

.case-study__tech-icons {
  display: flex;
  align-items: center;
  gap: 0.667rem;
}

.case-study__tech-icons img {
  display: block;
  height: auto;
}

.case-study--cleverly .case-study__credit-col h3,
.case-study--cleverly .case-study__credit-col p,
.case-study--echo .case-study__credit-col h3,
.case-study--echo .case-study__credit-col p,
.case-study--kotuitui .case-study__credit-col h3,
.case-study--kotuitui .case-study__credit-col p {
  color: #fff;
}

.case-study--cleverly .case-study__dark .case-study__next,
.case-study--echo .case-study__dark .case-study__next,
.case-study--kotuitui .case-study__dark .case-study__next {
  color: #fff;
}

.case-study__next {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 auto;
  padding: clamp(2rem, 4vh, 3rem) 0;
  font-size: var(--fs-body1);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.case-study--cleverly .case-study__dark .case-study__next {
  color: #fff;
}

.case-study__next-bar {
  display: flex;
  justify-content: center;
  padding: clamp(4rem, 8vh, 7rem) var(--pad-x) clamp(6rem, 12vh, 10rem);
}

.case-study__next:hover {
  opacity: 0.7;
}

.case-study__next svg {
  flex-shrink: 0;
}

.case-study__section--credit .case-study__inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
}

.case-study__section--credit .case-study__next {
  align-self: center;
}

.case-study__section--last,
.case-study--cleverly .case-study__section--credit,
.case-study--echo .case-study__section--credit,
.case-study--kotuitui .case-study__section--credit {
  padding-bottom: clamp(6rem, 12vh, 10rem);
}

/* Kōtuitui — research collage, outcome, credit */

.case-study__figure--film {
  aspect-ratio: 1360 / 765;
}

.case-study__research-collage {
  display: grid;
  grid-template-columns: 72fr 28fr;
  gap: 0;
  overflow: hidden;
  border-radius: clamp(1rem, 2vw, 1rem);
}

.case-study__research-collage-main {
  margin: 0;
  overflow: hidden;
}

.case-study__research-collage-main img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: clamp(1rem, 2vw, 1rem) 0 0 clamp(1rem, 2vw, 1rem);
}

.case-study__research-collage-right {
  display: grid;
  grid-template-rows: 225fr 426fr;
  min-height: 100%;
}

.case-study__research-collage-top,
.case-study__research-collage-bottom {
  margin: 0;
  overflow: hidden;
}

.case-study__research-collage-top img,
.case-study__research-collage-bottom img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-study__research-collage-top img {
  border-radius: 0 clamp(1rem, 2vw, 1rem) 0 0;
  object-position: bottom;
}

.case-study__research-collage-bottom img {
  border-radius: 0 0 clamp(1rem, 2vw, 1rem) 0;
}

.case-study__lead--wide {
  max-width: 42ch;
  font-size: var(--fs-body2);
  line-height: 1.14;
}

.case-study__figure--prototyping {
  max-width: 64rem;
  margin-left: auto;
  margin-right: auto;
}

.case-study__figure--refinement {
  max-width: 72rem;
  margin-left: auto;
  margin-right: auto;
}

.case-study__outcome-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(1.5rem, 3vw, 2.667rem);
  flex-wrap: wrap;
  margin-bottom: clamp(2.5rem, 5vh, 4rem);
}

.case-study__heading--outcome {
  font-size: var(--fs-subheading);
  margin-bottom: 0;
}

.case-study__visit-web {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.25rem;
  border: 2px solid #fff;
  border-radius: 2.75rem;
  font-size: var(--fs-body2);
  font-weight: 300;
  color: #fff;
  text-decoration: none;
  white-space: nowrap;
  transition: opacity 0.2s ease;
}

.case-study__visit-web:hover {
  opacity: 0.7;
}

.case-study__credit-meta--kotuitui .case-study__credit-col {
  display: flex;
  flex-direction: column;
  gap: clamp(2rem, 4vh, 3rem);
}

.case-study__credit-block h3 {
  font-size: var(--fs-text);
  font-weight: var(--fw-semibold);
  margin-bottom: 1rem;
}

.case-study__credit-block p {
  font-size: var(--fs-text);
  line-height: 1.3;
}

@media (max-width: 992px) {
  .case-study__meta {
    grid-template-columns: 1fr 1fr;
  }

  .case-study__meta-col:nth-child(3),
  .case-study__meta-col:nth-child(4) {
    grid-column: span 1;
  }

  .case-study__grid--2,
  .case-study__grid--3 {
    grid-template-columns: 1fr;
  }

  .case-study__research-composition {
    flex-direction: column;
    align-items: stretch;
    gap: clamp(1.5rem, 3vw, 2.667rem);
  }

  .case-study__research-item--brilliant,
  .case-study__research-item--duolingo,
  .case-study__research-item--khanmigo {
    width: 100%;
    margin-top: 0;
  }

  .case-study__split,
  .case-study__split--research,
  .case-study__split--equal {
    grid-template-columns: 1fr;
  }

  .case-study__research-collage {
    grid-template-columns: 1fr;
  }

  .case-study__research-collage-main img {
    border-radius: clamp(1rem, 2vw, 1rem) clamp(1rem, 2vw, 1rem) 0 0;
  }

  .case-study__research-collage-top img {
    border-radius: 0;
  }

  .case-study__research-collage-bottom img {
    border-radius: 0 0 clamp(1rem, 2vw, 1rem) clamp(1rem, 2vw, 1rem);
  }

  .case-study__research-collage-right {
    grid-template-rows: auto auto;
  }

  .case-study__split-figure:first-child img,
  .case-study__split-figure:last-child img {
    border-radius: clamp(1rem, 2vw, 1.667rem);
  }

  .case-study__credit-meta {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .case-study__meta,
  .case-study__credit-meta {
    grid-template-columns: 1fr;
  }

  .case-study__hero img,
  .case-study__hero-placeholder {
    aspect-ratio: 4 / 3;
  }
}