/* ============================================================
   Case study page styles — cs-* components, results card,
   comparison, strategy, galleries, metrics
   ============================================================ */

.case-study-layout {
  padding-top: 5.5rem;
}

/* ---- Case study hero ---- */
.cs-hero {
  padding-block: 3rem 4.5rem;
  background:
    radial-gradient(circle at 85% 15%, color-mix(in srgb, var(--primary) 14%, transparent) 0%, transparent 55%),
    radial-gradient(circle at 5% 90%, color-mix(in srgb, var(--accent) 10%, transparent) 0%, transparent 45%),
    var(--background);
}
.cs-hero__back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-4);
  text-decoration: none;
  margin-bottom: 2rem;
  transition: color 0.2s ease;
}
.cs-hero__back:hover { color: var(--primary); }
.cs-hero__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3rem;
  align-items: center;
}
.cs-hero__content h1 {
  font-size: clamp(1.9rem, 4vw, 2.9rem);
  line-height: 1.12;
  margin-bottom: 1.1rem;
}
.cs-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.1rem;
}
.cs-hero__description {
  font-size: 1.02rem;
  line-height: 1.75;
  color: var(--ink-3);
  margin-bottom: 1.5rem;
}
.cs-hero__actions {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}
@media (max-width: 900px) {
  .cs-hero__grid { grid-template-columns: 1fr; }
  .case-study-layout { padding-top: 5rem; }
}

/* ---- Results card (hero visual) ---- */
.results-card {
  background-color: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.results-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.results-card__before-after {
  display: flex;
  align-items: stretch;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.results-card__col {
  flex: 1;
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
}
.results-card__col--before { background-color: color-mix(in srgb, var(--destructive) 8%, transparent); }
.results-card__col--after  { background-color: color-mix(in srgb, var(--success) 10%, transparent); }
.results-card__period {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-4);
  margin-bottom: 0.5rem;
}
.results-card__metric--bad  .results-card__number { color: var(--destructive); }
.results-card__metric--good .results-card__number { color: var(--success); }
.results-card__number {
  display: block;
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}
.results-card__unit {
  font-size: 0.78rem;
  color: var(--ink-4);
}
.results-card__note {
  font-size: 0.78rem;
  color: var(--ink-3);
  margin-top: 0.4rem;
}
.results-card__arrow {
  display: flex;
  align-items: center;
  color: var(--accent);
}
.results-card__metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}
.results-card__kpi {
  text-align: center;
  padding: 0.8rem 0.5rem;
  border-radius: 10px;
  background-color: var(--bg-soft);
}
.results-card__kpi-value {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--foreground);
}
.results-card__kpi-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-4);
}

/* ---- Quick stats band ---- */
.cs-quick-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
@media (max-width: 900px) {
  .cs-quick-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .cs-quick-stats { grid-template-columns: 1fr; }
}

/* ---- Overview ---- */
.cs-overview {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 2.5rem;
  align-items: start;
}
.cs-overview__text h3 {
  font-size: 1.3rem;
  margin-bottom: 0.9rem;
}
.cs-overview__text p {
  line-height: 1.75;
  color: var(--ink-3);
  margin-bottom: 1rem;
}
.cs-overview__detail {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding-block: 0.75rem;
  border-bottom: 1px solid var(--border);
}
.cs-overview__detail:last-child { border-bottom: none; }
.cs-overview__detail-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-4);
}
.cs-overview__detail-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
}
@media (max-width: 900px) {
  .cs-overview { grid-template-columns: 1fr; }
}

/* ---- Challenge cards ---- */
.cs-challenge__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.challenge-card {
  text-align: center;
}
.challenge-card__icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}
.challenge-card h4 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}
.challenge-card p {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--ink-3);
}
@media (max-width: 900px) {
  .cs-challenge__grid { grid-template-columns: 1fr; }
}

/* ---- Strategy steps ---- */
.strategy-step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 1.25rem;
  padding-bottom: 2.25rem;
  position: relative;
}
.strategy-step:last-child { padding-bottom: 0; }
.strategy-step__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 0.95rem;
  box-shadow: 0 8px 20px -8px color-mix(in srgb, var(--primary) 60%, transparent);
}
.strategy-step h4 {
  font-size: 1.08rem;
  margin-bottom: 0.4rem;
}
.strategy-step p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--ink-3);
}

/* ---- Galleries & screenshots ---- */
.gallery-grid {
  display: grid;
  gap: 1.5rem;
}
.gallery-grid--1col { grid-template-columns: 1fr; }
.gallery-grid--2col { grid-template-columns: 1fr 1fr; }
.gallery-item__caption {
  font-size: 0.9rem;
  color: var(--ink-4);
  margin-top: 0.6rem;
  line-height: 1.6;
}
.gallery-item__caption strong { color: var(--ink-2); }
.screenshot-frame {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--card);
  box-shadow: 0 10px 30px -15px rgb(0 0 0 / 0.25);
}
.screenshot-frame img {
  width: 100%;
  display: block;
  aspect-ratio: 16/9;
  object-fit: cover;
  object-position: top;
}
@media (max-width: 900px) {
  .gallery-grid--2col { grid-template-columns: 1fr; }
}

/* ---- Comparison ---- */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.comparison__side {
  border-radius: var(--radius);
  padding: 1.5rem;
  border: 1px solid var(--border);
  background-color: var(--card);
}
.comparison__side--before { border-top: 4px solid var(--destructive); }
.comparison__side--after  { border-top: 4px solid var(--success); }
.comparison__badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.3rem 0.8rem;
  border-radius: 9999px;
  background-color: color-mix(in srgb, var(--destructive) 12%, transparent);
  color: var(--destructive);
  margin-bottom: 1.1rem;
}
.comparison__badge--after {
  background-color: color-mix(in srgb, var(--success) 12%, transparent);
  color: var(--success);
}
.comparison__item {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.7rem;
  border-bottom: 1px solid var(--border);
}
.comparison__item:last-child { border-bottom: none; }
.comparison__item-label {
  font-size: 0.9rem;
  color: var(--ink-4);
}
.comparison__item-value {
  font-family: var(--font-heading);
  font-weight: 800;
  color: var(--ink);
}
@media (max-width: 900px) {
  .comparison { grid-template-columns: 1fr; }
}

/* ---- Results metrics ---- */
.results-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
.result-metric {
  text-align: center;
  padding: 1.75rem 1rem;
}
@media (max-width: 900px) {
  .results-metrics { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .results-metrics { grid-template-columns: 1fr; }
}

/* ---- Related links ---- */
.cs-related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  justify-content: center;
}