.case-back,
.case-next {
  color: var(--text-secondary);
  font-size: 13px;
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
}

.case-next {
  color: var(--bg-elevated);
}

.case-hero {
  width: min(calc(100% - (var(--page-pad) * 2)), var(--max-width));
  margin: 0 auto;
  padding: clamp(88px, 11vw, 180px) 0 clamp(64px, 8vw, 120px);
}

.case-kicker {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.09em;
}

.case-hero h1 {
  max-width: 1120px;
  margin: 36px 0 72px;
  color: var(--text-primary);
  font-size: clamp(50px, 8vw, 116px);
  letter-spacing: -0.07em;
  line-height: 0.96;
}

.case-hero h1 span {
  display: block;
}

.case-intro {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 0.7fr);
  gap: clamp(56px, 10vw, 180px);
  align-items: start;
}

.case-intro > p {
  max-width: 760px;
  margin: 0;
  color: var(--text-secondary);
  font-size: clamp(18px, 2vw, 28px);
  line-height: 1.7;
}

.case-intro dl {
  margin: 0;
}

.case-intro dl div {
  padding: 15px 0;
  display: grid;
  grid-template-columns: 90px 1fr;
  border-top: 1px solid var(--line);
}

.case-intro dl div:last-child {
  border-bottom: 1px solid var(--line);
}

.case-intro dt {
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 10px;
}

.case-intro dd {
  margin: 0;
  font-size: 13px;
}

.case-gallery {
  min-height: 720px;
  padding: 64px var(--page-pad);
  display: grid;
  grid-template-columns: repeat(4, minmax(200px, 1fr));
  gap: clamp(14px, 2vw, 28px);
  align-items: center;
  overflow: hidden;
  background: var(--text-primary);
}

.case-gallery figure {
  height: 78%;
  margin: 0;
  overflow: hidden;
  border: 7px solid var(--bg-elevated);
  border-radius: var(--radius-sm);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.26);
}

.case-gallery figure:nth-child(1) {
  transform: rotate(-3deg) translateY(18px);
}

.case-gallery figure:nth-child(2) {
  transform: rotate(2deg) translateY(-20px);
}

.case-gallery figure:nth-child(3) {
  transform: rotate(-1deg) translateY(26px);
}

.case-gallery figure:nth-child(4) {
  transform: rotate(3deg) translateY(-10px);
}

.case-gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-body {
  padding-top: 40px;
}

.case-section {
  padding: clamp(72px, 9vw, 136px) 0;
  border-bottom: 1px solid var(--line);
}

.case-two-column {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(320px, 0.65fr);
  gap: clamp(64px, 10vw, 180px);
}

.case-two-column h2 {
  margin: 0;
  font-size: clamp(38px, 5vw, 74px);
  letter-spacing: -0.055em;
  line-height: 1.08;
}

.case-two-column p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 17px;
  line-height: 1.95;
}

.engine-flow {
  margin: 50px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  list-style: none;
  border-top: 1px solid var(--line);
}

.engine-flow li {
  min-height: 250px;
  padding: 24px;
  border-right: 1px solid var(--line);
}

.engine-flow li:first-child {
  border-left: 1px solid var(--line);
}

.engine-flow span {
  color: var(--primary);
  font-family: var(--font-mono);
  font-size: 11px;
}

.engine-flow strong {
  margin-top: 44px;
  display: block;
  font-size: 19px;
}

.engine-flow p {
  margin: 10px 0 0;
  color: var(--text-secondary);
  font-size: 13px;
}

.case-principle blockquote {
  max-width: 1100px;
  margin: 52px 0 0;
  padding: 0;
  color: var(--primary);
  font-size: clamp(34px, 5vw, 74px);
  font-weight: 620;
  letter-spacing: -0.055em;
  line-height: 1.2;
}

.case-note {
  margin-top: 28px !important;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--text-tertiary) !important;
  font-family: var(--font-mono);
  font-size: 10px !important;
}

@media (max-width: 900px) {
  .case-intro,
  .case-two-column {
    grid-template-columns: 1fr;
  }

  .case-gallery {
    min-height: 580px;
    grid-template-columns: repeat(4, 260px);
    overflow-x: auto;
  }

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

@media (max-width: 620px) {
  .case-hero h1 {
    margin-bottom: 52px;
  }

  .case-gallery {
    min-height: 500px;
    grid-template-columns: repeat(4, 220px);
    justify-content: start;
  }

  .engine-flow {
    grid-template-columns: 1fr;
  }

  .engine-flow li {
    min-height: 210px;
    border-bottom: 1px solid var(--line);
    border-left: 1px solid var(--line);
  }
}