/* ─────────────────────────────────────────
   Case Study – Additional Styles
   (Builds on top of styles.css)
───────────────────────────────────────── */

/* ── Back Nav ── */
.cs-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  padding: 0.5rem 0;
  transition: color var(--transition), gap var(--transition);
  margin-bottom: 2.5rem;
}

.cs-back:hover {
  color: var(--clr-accent);
  gap: 0.75rem;
}

.cs-back svg {
  flex-shrink: 0;
  transition: transform var(--transition);
}

.cs-back:hover svg {
  transform: translateX(-3px);
}

/* ── Case Study Hero ── */
.cs-hero {
  padding: 8rem 2rem 4rem;
  background: var(--clr-bg);
}

.cs-hero-inner {
  max-width: 1100px;
  margin-inline: auto;
}

.cs-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: 1.5rem;
}

.cs-breadcrumb-sep {
  opacity: 0.5;
}

.cs-hero-title {
  font-family: var(--ff-heading);
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--clr-text);
  margin-bottom: 1.5rem;
}

.cs-hero-subtitle {
  font-size: 1.1rem;
  color: var(--clr-text-muted);
  line-height: 1.75;
  max-width: 680px;
  margin-bottom: 3rem;
}

.cs-hero-meta {
  display: flex;
  flex-wrap: nowrap;
  gap: 2rem;
  padding: 2rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
}

.cs-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1;
  min-width: 0;
}

.cs-meta-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clr-accent);
}

.cs-meta-value {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--clr-text);
}

/* ── Divider ── */
.cs-divider {
  border: none;
  border-top: 1px solid var(--clr-border);
  margin: 4rem 0;
}

/* ── Impact Banner ── */
.cs-impact {
  padding: 4rem 2rem;
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}

.cs-impact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  max-width: 860px;
  margin-inline: auto;
  text-align: center;
}

.cs-impact-stat {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.cs-impact-number {
  font-family: var(--ff-heading);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--clr-accent);
  line-height: 1;
}

.cs-impact-label {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  line-height: 1.4;
}

/* ── Body Content ── */
.cs-body {
  padding: 5rem 2rem;
  background: var(--clr-bg);
}

.cs-content {
  max-width: 1100px;
  margin-inline: auto;
}

.cs-section {
  margin-bottom: 4rem;
}

.cs-section-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: 0.75rem;
}

.cs-section-title {
  font-family: var(--ff-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: 1rem;
  line-height: 1.25;
}

.cs-section p {
  color: var(--clr-text-muted);
  font-size: 0.98rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

.cs-section p:last-child {
  margin-bottom: 0;
}

/* ── Process Steps ── */
.cs-process {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-top: 1.75rem;
}

.cs-step {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  position: relative;
}

.cs-step-number {
  font-family: var(--ff-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--clr-accent);
  opacity: 0.25;
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  line-height: 1;
}

.cs-step h4 {
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--clr-text);
}

.cs-step p {
  font-size: 0.82rem;
  color: var(--clr-text-muted);
  line-height: 1.6;
  margin: 0;
}

/* ── Outcomes List ── */
.cs-outcomes-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.cs-outcome-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--clr-accent);
}

.cs-outcome-icon {
  color: var(--clr-accent);
  flex-shrink: 0;
  margin-top: 1px;
}

.cs-outcome-text {
  font-size: 0.92rem;
  color: var(--clr-text);
  line-height: 1.6;
}

.cs-outcome-text strong {
  color: var(--clr-accent);
}

/* ── Role Tags ── */
.cs-role-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.25rem;
}

.cs-role-tag {
  font-size: 0.8rem;
  padding: 0.4rem 1rem;
  background: var(--clr-accent-subtle);
  border: 1px solid rgba(160, 118, 58, 0.2);
  border-radius: 100px;
  color: var(--clr-accent);
  font-weight: 500;
}

/* ── Two-col layout ── */
.cs-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1.5rem;
}

.cs-col {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
}

.cs-col h4 {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: 1rem;
}

.cs-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.cs-col ul li {
  font-size: 0.88rem;
  color: var(--clr-text-muted);
  line-height: 1.5;
  padding-left: 1rem;
  position: relative;
}

.cs-col ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--clr-accent);
  font-size: 0.7rem;
}

/* ── Case Study Footer Nav ── */
.cs-footer-nav {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  padding: 3rem 2rem;
}

.cs-footer-nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 860px;
  margin-inline: auto;
  gap: 1.5rem;
}

.cs-nav-link {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  max-width: 260px;
  transition: var(--transition);
}

.cs-nav-link.next {
  text-align: right;
}

.cs-nav-direction {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clr-accent);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.cs-nav-link.next .cs-nav-direction {
  justify-content: flex-end;
}

.cs-nav-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  line-height: 1.4;
  transition: color var(--transition);
}

.cs-nav-link:hover .cs-nav-title {
  color: var(--clr-text);
}

.cs-nav-center {
  flex-shrink: 0;
}

/* ── Image Blocks ── */
.cs-image-block {
  margin: 2rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--clr-border);
  background: var(--clr-surface-2);
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}

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

.cs-image-caption {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  text-align: center;
  padding: 0.6rem 1rem;
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  font-style: italic;
}

.cs-image-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 2rem 0;
}

.cs-image-grid .cs-image-block {
  margin: 0;
}

.cs-image-full {
  margin: 2rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--clr-border);
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}

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

.cs-image-full .cs-image-caption {
  border-top: 1px solid var(--clr-border);
}

@media (max-width: 680px) {
  .cs-image-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .cs-hero-meta {
    flex-wrap: wrap;
    gap: 1.25rem;
  }
}

/* ── Responsive ── */
@media (max-width: 680px) {
  .cs-impact-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .cs-footer-nav-inner {
    flex-direction: column;
    text-align: center;
  }

  .cs-nav-link.next {
    text-align: center;
  }

  .cs-nav-link.next .cs-nav-direction {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .cs-impact-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }

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

/* ── Intro Split (text + screenshot side by side) ── */
.cs-intro-split {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 3rem;
}

.cs-intro-text {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.cs-intro-text p {
  color: var(--clr-text-muted);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 1rem;
}

.cs-intro-text p:last-child {
  margin-bottom: 0;
}

.cs-intro-image {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--clr-border);
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
}

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

@media (max-width: 768px) {
  .cs-intro-split {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* ── Highlight Block (vision/quote) ── */
.cs-highlight-block {
  background: var(--clr-accent-subtle);
  border-left: 3px solid var(--clr-accent);
  border-radius: var(--radius-sm);
  padding: 1.5rem 2rem;
  margin: 1.5rem 0 2rem;
}

.cs-highlight-block p {
  font-family: var(--ff-heading);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--clr-text);
  line-height: 1.6;
  margin: 0;
}