/* Case-study page. Shared tokens, header, buttons, and footer live in styles.css. */

.case-study {
  padding-block: clamp(48px, 6vw, 72px) 88px;
}

.case-study-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  align-items: start;
  gap: clamp(40px, 5vw, 64px);
}

.case-study-hero > * {
  min-width: 0;
}

.case-study-hero .hero-copy {
  max-width: 760px;
}

.case-study-hero h1 {
  max-width: 680px;
  margin: 0 0 24px;
  font-size: clamp(3rem, 5vw, 4.8rem);
  line-height: 1.02;
}

.case-study-hero .lead {
  max-width: 42rem;
  margin: 0;
  color: var(--color-text-secondary);
  font-size: clamp(1.1rem, 1.7vw, 1.4rem);
}

.case-study-meta {
  display: grid;
  gap: 16px;
  margin-top: 34px;
}

.case-study-meta div {
  display: grid;
  gap: 6px;
}

.case-study-meta .label,
.decision-label,
.flow-label {
  color: var(--color-cobalt-core);
  font-family: var(--font-sans);
  font-size: 0.74rem;
  font-weight: 750;
  line-height: 1.4;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.case-study-meta p {
  margin: 0;
  color: var(--color-text-primary);
  font-size: 1rem;
  line-height: 1.65;
}

.hero-figure,
.case-feature-visual {
  width: 100%;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.hero-figure img {
  display:block;
  width: 100%;
  height:auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: center;
}

.hero-figure figcaption,
.case-feature-visual figcaption {
  margin: 0;
  padding: 14px 16px 16px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.case-study-section {
  margin-top: clamp(64px, 8vw, 96px);
}

.case-study-section .section-title {
  margin-bottom: 28px;
}

.case-study-section .section-title h2 {
  max-width: 14ch;
  font-size: clamp(2.15rem, 3vw, 3.45rem);
  line-height: 1.08;
}

.case-study-section > p {
  max-width: 70ch;
  margin: 0 0 20px;
  color: var(--color-text-primary);
  font-size: 1.02rem;
  line-height: 1.8;
}

.challenge-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding-left: 1.35rem;
  color: var(--color-text-primary);
  font-size: 1.02rem;
  line-height: 1.75;
}

.finding-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.finding-card {
  min-width: 0;
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: rgb(255 255 255 / 78%);
  box-shadow: 0 12px 35px rgb(35 36 46 / 7%);
}

.finding-card h3 {
  margin: 0 0 14px;
  font-size: 1.14rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.finding-card p {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1.72;
}

.finding-card p + p {
  margin-top: 12px;
}

.finding-card strong {
  color: var(--color-text-primary);
}

.decision-chains {
  display: grid;
  gap: 18px;
}

.decision-chain {
  display: grid;
  grid-template-columns:
    minmax(0, 1fr) 28px minmax(0, 1fr) 28px minmax(0, 1fr);
  align-items: stretch;
  gap: 14px;
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: rgb(255 255 255 / 92%);
  box-shadow: 0 18px 40px rgb(20 24 40 / 5%);
}

.decision-cell {
  min-width: 0;
}

.decision-label {
  display: block;
  margin-bottom: 10px;
}

.decision-cell p {
  max-width: 34rem;
  margin: 0;
  color: var(--color-text-primary);
  font-size: 0.98rem;
  line-height: 1.7;
}

.decision-connector {
  display: grid;
  width: 28px;
  place-items: center;
  color: var(--color-cobalt-core);
  font-size: 1rem;
  opacity: 0.65;
}

.decision-connector::before {
  content: "→";
}

.case-feature-visual {
  margin: 32px 0 36px;
}

.case-feature-visual img {
  display:block;
  width: 100%;
  height:auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  object-position: center;
  background: var(--color-surface);
}

.flow-label {
  margin: 20px 0 12px;
  color: var(--color-text-secondary);
}

.decision-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.flow-step {
  padding: 10px 14px;
  border: 1px solid rgb(46 85 238 / 16%);
  border-radius: 12px;
  background: var(--color-cobalt-mist);
  color: var(--color-cobalt-core);
  font-size: 0.95rem;
  font-weight: 700;
  white-space: nowrap;
}

.flow-divider {
  color: var(--color-cobalt-core);
  font-size: 1rem;
  font-weight: 800;
}

.case-study-footer {
  margin-top: clamp(72px, 8vw, 96px);
  padding-top: 44px;
  border-top: 1px solid var(--color-border);
}

.footer-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.next-project {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  border-radius: 12px;
  text-decoration: none;
  transition: background-color 180ms ease, transform 180ms ease;
}

.next-project:hover {
  background: var(--color-cobalt-mist);
  transform: translateY(-1px);
}

.next-project:focus-visible {
  outline: 3px solid rgb(46 85 238 / 28%);
  outline-offset: 3px;
}

.next-project p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.next-title {
  color: var(--color-text-primary);
  font-weight: 800;
}

.next-note {
  font-size: 0.9rem;
}

@media (max-width: 1040px) {
  .case-study-hero {
    grid-template-columns: 1fr;
  }

  .hero-figure {
    max-width: 760px;
  }

  .finding-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .case-study {
    padding-block: 36px 64px;
  }

  .case-study-hero {
    gap: 32px;
  }

  .case-study-hero h1 {
    font-size: clamp(2.8rem, 12vw, 3.8rem);
  }

  .case-study-section {
    margin-top: 64px;
  }

  .decision-chain {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .decision-connector {
    width: 100%;
    height: 20px;
  }

  .decision-connector::before {
    content: "↓";
  }

  .footer-actions {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .case-study {
    padding-block: 28px 52px;
  }

  .finding-card,
  .decision-chain {
    padding: 20px;
  }

  .decision-flow {
    align-items: stretch;
    flex-direction: column;
  }

  .flow-step {
    width: 100%;
    text-align: center;
    white-space: normal;
  }

  .flow-divider {
    display: none;
  }
}

/* Bilingual case-study cover and previous/next navigation */
.case-hero-visual img {
  aspect-ratio: 4 / 5;
}

.project-pagination {
  display: grid;
  min-width: min(100%, 520px);
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.project-nav-link {
  display: grid;
  min-width: 0;
  gap: 4px;
  padding: 12px 14px;
  border-radius: 12px;
  text-decoration: none;
  transition: background-color 180ms ease, transform 180ms ease;
}

.project-nav-link:hover {
  background: var(--color-cobalt-mist);
  transform: translateY(-1px);
}

.project-nav-link:focus-visible {
  outline: 3px solid rgb(46 85 238 / 28%);
  outline-offset: 3px;
}

.project-nav-link p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.project-nav-link .next-title {
  color: var(--color-text-primary);
  font-weight: 800;
}

.next-project {
  text-align: right;
}

@media (max-width: 1040px) {
  .hero-figure {
    width: min(100%, 560px);
    margin-inline: auto;
  }
}

@media (max-width: 768px) {
  .footer-actions,
  .project-pagination {
    width: 100%;
  }
}

@media (max-width: 560px) {
  .project-pagination {
    grid-template-columns: 1fr;
  }

  .next-project {
    text-align: left;
  }
}