/* ============================================================
   CONCEPT SECTION (イベント概要)
   ============================================================ */
.concept {
  background-color: var(--color-cream);
}

.concept__intro {
  max-width: 760px;
  margin: 0 auto 70px;
  text-align: center;
  font-size: 17px;
  color: #5a5350;
}

.concept__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
}

.concept-card {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background-color: var(--color-white);
  box-shadow: 0 10px 30px rgba(32, 26, 24, 0.06);
  transition: transform 0.5s var(--ease-out-expo), box-shadow 0.5s var(--ease-out-expo);
}

.concept-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 24px 48px rgba(150, 22, 15, 0.18);
}

.concept-card__image {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.concept-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s var(--ease-out-expo);
}

.concept-card:hover .concept-card__image img {
  transform: scale(1.08);
}

.concept-card__number {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 2;
  font-family: var(--font-accent);
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--color-cream);
  background-color: var(--color-primary);
  padding: 6px 16px;
  border-radius: 100px;
  text-transform: uppercase;
}

.concept-card__body {
  padding: 28px 26px 32px;
}

.concept-card__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 12px;
}

.concept-card__title span {
  display: block;
  font-family: var(--font-accent);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.concept-card__text {
  font-size: 14.5px;
  color: #5a5350;
  margin: 0;
}

@media (max-width: 900px) {
  .concept__grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

/* ============================================================
   EXHIBITORS SECTION (出店者一覧)
   ============================================================ */
.exhibitors {
  background-color: var(--color-ink);
  color: var(--color-cream);
  position: relative;
}

.exhibitors .section-heading__title {
  color: var(--color-cream);
}

.exhibitors .section-heading__lead {
  color: rgba(255, 250, 242, 0.7);
}

.exhibitors__filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
}

.exhibitors__filter-btn {
  font-family: var(--font-accent);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 10px 26px;
  border-radius: 100px;
  border: 1px solid rgba(255, 250, 242, 0.3);
  background-color: transparent;
  color: var(--color-cream);
  transition: all 0.3s ease;
}

.exhibitors__filter-btn:hover,
.exhibitors__filter-btn.is-active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-cream);
}

.exhibitors__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.exhibitor-card {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  background-color: rgba(255, 250, 242, 0.04);
  border: 1px solid rgba(255, 250, 242, 0.08);
  transition: transform 0.45s var(--ease-out-expo), border-color 0.45s ease;
}

.exhibitor-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-gold);
}

.exhibitor-card__image {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
}

.exhibitor-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease-out-expo);
}

.exhibitor-card:hover .exhibitor-card__image img {
  transform: scale(1.1);
}

.exhibitor-card__tag {
  position: absolute;
  bottom: 12px;
  left: 12px;
  z-index: 2;
  font-family: var(--font-accent);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  background-color: var(--color-gold);
  color: var(--color-ink);
  padding: 5px 14px;
  border-radius: 100px;
  font-weight: 600;
}

.exhibitor-card__body {
  padding: 20px 20px 24px;
}

.exhibitor-card__title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-cream);
}

.exhibitor-card__text {
  font-size: 13.5px;
  color: rgba(255, 250, 242, 0.65);
  margin: 0;
  line-height: 1.7;
}

@media (max-width: 1024px) {
  .exhibitors__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 767px) {
  .exhibitors__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

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