/* =============================
   cases
============================= */
.cases {
  padding: 64px 0 48px;
  background: var(--color-bg-gray);
}

.cases__container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* =============================
   filter
============================= */
.cases__filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 48px;
}

.cases__filter-btn {
  padding: 8px 20px;
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: 50px;
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}

.cases__filter-btn:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.cases__filter-btn--active {
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
  border-color: transparent;
  color: var(--color-text-sub);
}

/* =============================
   grid
============================= */
.cases__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* hidden state（JSでフィルター時に付与） */
.case-card.case-card--hidden {
  display: none;
}

/* =============================
   case-card
============================= */
.case-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.25s, transform 0.25s;
}

.case-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

/* header */
.case-card__header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 24px 24px 0;
}

.case-card__logo {
  font-size: 2rem;
  line-height: 1;
  flex-shrink: 0;
}

.case-card__name {
  font-size: var(--fs-base);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 4px;
  line-height: 1.3;
}

.case-card__tag {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* body */
.case-card__body {
  padding: 20px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1;
}

/* KPIs */
.case-card__kpis {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  background: var(--color-bg-gray);
  border-radius: 8px;
  padding: 16px 12px;
}

.case-card__kpi {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
}

.case-card__kpi-val {
  font-size: var(--fs-lg);
  font-weight: 900;
  color: var(--gold);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.case-card__kpi-key {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* comment */
.case-card__comment {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  line-height: 1.85;
}

/* =============================
   cases-note
============================= */
.cases-note {
  padding: 16px 0 32px;
  background: var(--color-bg-gray);
}

.cases-note__container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.cases-note__text {
  font-size: var(--fs-xs);
  color: var(--color-text-lighter);
}

/* =============================
   responsive
============================= */
@media (max-width: 1024px) {
  .cases__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 960px) {
  .cases__filter {
    gap: 8px;
  }

  .cases__filter-btn {
    padding: 7px 14px;
    font-size: 0.7rem;
  }
}

@media (max-width: 600px) {
  .cases__grid {
    grid-template-columns: 1fr;
  }
}