/* ===================================
   Footer — フッター
   =================================== */

.footer {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  padding: 60px 0 0;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- ロゴ・塾情報カラム --- */
.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer__logo img {
  height: 36px;
  width: auto;
}

.footer__logo-text {
  font-size: 1.125rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
}

.footer__catchcopy {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.7;
}

.footer__info {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.8;
}

.footer__info dt {
  display: none;
}

.footer__info dd {
  margin-bottom: 4px;
}

/* --- ナビカラム --- */
.footer__nav-title {
  font-size: 0.9375rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer__nav-list li {
  margin-bottom: 8px;
}

.footer__nav-list a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
  transition: color 0.3s ease;
}

.footer__nav-list a:hover {
  color: var(--color-white);
  opacity: 1;
}

/* --- SNS --- */
.footer__sns {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.footer__sns a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.15);
  color: var(--color-white);
  font-size: 1rem;
  transition: background-color 0.3s ease;
}

.footer__sns a:hover {
  background-color: rgba(255, 255, 255, 0.3);
  opacity: 1;
}

/* --- コピーライト --- */
.footer__bottom {
  margin-top: 40px;
  padding: 20px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  text-align: center;
}

.footer__copyright {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.65);
}

/* --- レスポンシブ --- */
@media (max-width: 768px) {
  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    padding: 0 16px;
  }

  .footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 480px) {
  .footer {
    padding: 48px 0 0;
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer__bottom {
    margin-top: 32px;
    padding: 16px;
  }
}