/* ============================================================
   CASE STUDY SHARED LAYOUT
============================================================ */

/* Case Header */
.cs-header {
  padding-top: calc(64px + var(--space-64));
  padding-bottom: var(--space-64);
  padding-inline: var(--margin);
  border-bottom: 1px solid var(--background-divider);
}

.cs-header__back {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  font-size: var(--size-body-sm);
  color: var(--accent-primary);
  font-weight: 500;
  margin-bottom: var(--space-48);
  transition: opacity 0.2s ease;
}

.cs-header__back:hover {
  opacity: 0.75;
}

.cs-header__tag {
  margin-bottom: var(--space-24);
}

.cs-header__title {
  font-family: var(--font-display);
  font-size: var(--size-display);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  max-width: 900px;
  margin-bottom: var(--space-40);
}

.cs-header__hook {
  font-size: 22px;
  color: var(--text-secondary);
  line-height: 1.55;
  max-width: 900px;
  margin-bottom: var(--space-64);
}

/* Meta row */
.cs-meta {
  display: flex;
  gap: 0;
  border-top: 1px solid var(--background-divider);
  padding-top: var(--space-24);
}

.cs-meta__pill {
  flex: 1;
  padding-right: var(--space-40);
}

.cs-meta__label {
  font-size: var(--size-label);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-ghost);
  margin-bottom: var(--space-8);
}

.cs-meta__value {
  font-size: var(--size-body-md);
  color: var(--text-primary);
  font-weight: 400;
}

/* Hero image */
.cs-hero-image {
  width: 100%;
  aspect-ratio: 1440 / 650;
  background-color: var(--background-secondary);
  overflow: hidden;
}

.cs-hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.cs-hero-image__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-ghost);
  font-size: var(--size-body-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Generic case study section */
.cs-section {
  padding-top: var(--space-80);
  padding-bottom: var(--space-80);
  padding-inline: var(--margin);
  border-top: 1px solid var(--background-divider);
}

.cs-section__tag {
  margin-bottom: var(--space-24);
}

.cs-section__title {
  font-family: var(--font-display);
  font-size: var(--size-h3);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  max-width: 840px;
  margin-bottom: var(--space-40);
}

.cs-section__body {
  font-size: var(--size-body-md);
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 840px;
}

/* Problem layout (body + stakes callout side by side) */
.cs-problem__layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-64);
  align-items: start;
}

/* Stakes callout box */
.cs-stakes {
  padding: var(--space-24);
  border-left: 3px solid var(--accent-primary);
  background-color: var(--background-secondary);
}

.cs-stakes__label {
  font-size: var(--size-label);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: var(--space-16);
}

.cs-stakes__content {
  font-size: var(--size-body-sm);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Decisions */
.cs-decisions {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: var(--space-40);
}

.cs-decision {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--space-64);
  align-items: start;
  padding-top: var(--space-32);
  padding-bottom: var(--space-32);
  border-top: 1px solid var(--background-divider);
}

.cs-decision__left {
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

.cs-decision__number {
  font-family: var(--font-body);
  font-size: var(--size-body-sm);
  font-weight: 500;
  color: var(--text-ghost);
  letter-spacing: 0.05em;
}

.cs-decision__title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

.cs-decision__body {
  font-size: var(--size-body-md);
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 720px;
}

.cs-decision__tradeoff {
  display: inline-flex;
  align-items: center;
  padding: var(--space-8) var(--space-16);
  background-color: var(--accent-subtle);
  border-radius: var(--radius-full);
  font-size: var(--size-body-sm);
  color: var(--accent-primary);
  font-weight: 500;
  align-self: flex-start;
  margin-top: var(--space-8);
}

/* Before/after comparison slider */
.cs-compare {
  position: relative;
  width: 100%;
  margin-top: var(--space-40);
  border-radius: var(--radius-md);
  overflow: hidden;
  user-select: none;
  cursor: col-resize;
}

.cs-compare__before {
  position: absolute;
  inset: 0;
  clip-path: inset(0 50% 0 0);
}

.cs-compare__img {
  display: block;
  width: 100%;
  height: auto;
}

/* Invisible range input sits on top of everything */
.cs-compare__slider {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: col-resize;
  margin: 0;
  z-index: 3;
}

.cs-compare__handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  background: #fff;
  z-index: 2;
  pointer-events: none;
}

.cs-compare__handle::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}

.cs-compare__handle::after {
  content: '⟨ ⟩';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 13px;
  color: var(--text-secondary);
  pointer-events: none;
  letter-spacing: -2px;
}

.cs-compare__label {
  position: absolute;
  bottom: var(--space-16);
  z-index: 2;
  padding: var(--space-4) var(--space-12);
  background: rgba(0,0,0,0.45);
  border-radius: var(--radius-full);
  font-size: var(--size-label);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #fff;
  pointer-events: none;
}

.cs-compare__label--before { left: var(--space-16); }
.cs-compare__label--after  { right: var(--space-16); }

/* What Shipped — image grid */
.cs-image-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-24);
  margin-top: var(--space-40);
}

.cs-image-cell {
  position: relative;
  background-color: var(--background-secondary);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.cs-image-cell img {
  width: 100%;
  height: auto;
  display: block;
}

.cs-image-figure {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.cs-image-caption {
  font-size: var(--size-body-sm);
  color: var(--text-ghost);
  line-height: 1.55;
}

.cs-image-cell--auto {
  height: auto;
}

.cs-image-cell--auto .cs-image-cell__img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: unset;
}

.cs-image-cell__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-ghost);
  font-size: var(--size-body-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: center;
  padding: var(--space-24);
}

.cs-image-cell__tag {
  position: absolute;
  top: var(--space-16);
  right: var(--space-16);
  padding: var(--space-4) var(--space-12);
  background-color: var(--background-primary);
  border-radius: var(--radius-full);
  font-size: var(--size-label);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

/* Outcome stats */
.cs-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-20);
  margin-top: var(--space-48);
}

.cs-stat {
  padding: var(--space-24);
  background-color: var(--background-secondary);
  border-radius: var(--radius-md);
}

.cs-stat__number {
  font-family: var(--font-display);
  font-size: var(--size-stat);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -0.03em;
  color: var(--accent-primary);
  margin-bottom: var(--space-12);
}

.cs-stat__label {
  font-size: var(--size-body-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Next project */
.cs-next {
  padding-top: var(--space-64);
  padding-bottom: var(--space-64);
  padding-inline: var(--margin);
  border-top: 1px solid var(--background-divider);
}

.cs-next__label {
  font-size: var(--size-body-sm);
  color: var(--text-ghost);
  margin-bottom: var(--space-8);
}

.cs-next__link {
  display: block;
  font-family: var(--font-display);
  font-size: var(--size-h3);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  transition: color 0.2s ease;
  margin-bottom: var(--space-16);
}

.cs-next__link:hover {
  color: var(--accent-primary);
}

/* Mobile */
@media (max-width: 1024px) {
  .cs-header,
  .cs-section,
  .cs-next {
    padding-inline: var(--space-24);
  }

  .cs-header__title {
    font-size: clamp(48px, 8vw, 88px);
  }

  .cs-problem__layout {
    grid-template-columns: 1fr;
  }

  .cs-decision {
    grid-template-columns: 1fr;
  }

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

  .cs-stat__number {
    font-size: 40px;
  }
}

@media (max-width: 768px) {
  .cs-meta {
    flex-direction: column;
    gap: var(--space-24);
  }

  .cs-image-grid {
    grid-template-columns: 1fr;
  }

  .cs-image-cell {
    height: auto;
  }

  .cs-stats {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .cs-stats {
    grid-template-columns: 1fr;
  }
}