/* case-study.css - Case study section "Before / After で見る、AI導入のリアル" */

.case-study {
  position: relative;
  padding: var(--sp-9) 0;
  background: var(--cal-bg);
  overflow: hidden;
}

.case-study__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--sp-5);
}

.case-study__header {
  text-align: center;
  margin-bottom: var(--sp-8);
}
.case-study__label { display: inline-block; margin-bottom: var(--sp-3); }
.case-study__heading { margin-bottom: var(--sp-4); }
.case-study__lead {
  color: var(--fg-2);
  max-width: 40em;
  margin: 0 auto;
}

/* --- Items grid ----------------------------------------------- */
.case-study__items {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-5);
  max-width: 1120px;
  margin: 0 auto;
}

/* --- Article card --------------------------------------------- */
.case-study__card {
  padding: var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

.case-study__title {
  margin: 0;
}

/* --- Before / After compare block ----------------------------- */
.case-study__compare {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: stretch;
  gap: var(--sp-3);
  margin: 0;
}

.case-study__before,
.case-study__after {
  border-radius: var(--r-md);
  padding: var(--sp-4);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.case-study__before {
  background: var(--cal-bg-soft);
  color: var(--cal-text);
}
.case-study__after {
  background: var(--cal-teal-dark);
  color: var(--cal-white);
}

.case-study__compare-label {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  margin: 0;
  color: var(--cal-teal);
}
.case-study__after .case-study__compare-label {
  color: var(--cal-teal-tint);
}

.case-study__compare-text {
  margin: 0;
  font-size: var(--fs-body-sm);
  line-height: var(--lh-relaxed);
}

.case-study__compare-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cal-coral);
  flex-shrink: 0;
}
.case-study__compare-arrow i,
.case-study__compare-arrow svg {
  width: 28px;
  height: 28px;
  stroke-width: 2;
}

/* --- KPI strip ------------------------------------------------ */
.case-study__kpis {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-4);
  margin: 0;
  padding-top: var(--sp-5);
  border-top: 1px solid var(--cal-line);
}

.case-study__kpi {
  display: flex;
  flex-direction: column-reverse; /* show value (dd) on top, label (dt) below */
  align-items: center;
  text-align: center;
  gap: var(--sp-1);
  margin: 0;
}

.case-study__kpi-value {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: var(--fw-bold);
  color: var(--cal-teal);
  line-height: 1.1;
  margin: 0;
  text-wrap: balance;
  word-break: keep-all;
}

.case-study__kpi-label {
  font-family: var(--font-body);
  font-size: var(--fs-body-sm);
  color: var(--fg-2);
  margin: 0;
}

/* --- CTA after items ------------------------------------------ */
.case-study__cta {
  text-align: center;
  margin-top: var(--sp-7);
}

/* --- Tablet / mobile ------------------------------------------ */
@media (max-width: 1024px) {
  .case-study__items {
    grid-template-columns: 1fr;
    max-width: 640px;
  }
}

@media (max-width: 768px) {
  .case-study {
    padding: var(--sp-7) 0;
  }
  .case-study__card {
    padding: var(--sp-5);
    gap: var(--sp-4);
  }

  /* Stack Before / After vertically with down-pointing arrow */
  .case-study__compare {
    grid-template-columns: 1fr;
  }
  .case-study__compare-arrow i,
  .case-study__compare-arrow svg {
    transform: rotate(90deg);
  }

  .case-study__kpis {
    gap: var(--sp-3);
    padding-top: var(--sp-4);
  }
  .case-study__kpi-value {
    font-size: var(--fs-h4);
  }
}