.prefecture-menu {
  position: relative;
  color: inherit;
}

.prefecture-menu > summary {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.55rem 0.85rem;
  border: 1px solid rgba(18, 82, 63, 0.22);
  border-radius: 999px;
  background: #fff;
  color: #12523f;
  font-weight: 800;
  line-height: 1;
  cursor: pointer;
  list-style: none;
}

.prefecture-menu > summary::-webkit-details-marker { display: none; }
.prefecture-menu > summary::after { content: "⌄"; font-size: 0.82em; }
.prefecture-menu[open] > summary::after { transform: rotate(180deg); }
.prefecture-menu > summary:focus-visible { outline: 3px solid rgba(22, 163, 74, 0.28); outline-offset: 3px; }

.prefecture-menu__panel {
  position: absolute;
  z-index: 80;
  top: calc(100% + 0.55rem);
  right: 0;
  width: min(21rem, calc(100vw - 2rem));
  padding: 0.9rem;
  border: 1px solid rgba(18, 82, 63, 0.18);
  border-radius: 1rem;
  background: #fff;
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.16);
}

.prefecture-menu__current {
  margin: 0 0 0.65rem;
  color: #64748b;
  font-size: 0.8rem;
  font-weight: 800;
}

.prefecture-menu__links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.45rem;
}

.prefecture-menu__links a,
.prefecture-menu__all {
  display: flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 0.65rem;
  border-radius: 0.7rem;
  background: #eefaf4;
  color: #12523f;
  font-weight: 800;
  text-decoration: none;
}

.prefecture-menu__links a:hover,
.prefecture-menu__all:hover { background: #dcf5e7; }
.prefecture-menu__all { margin-top: 0.45rem; }

@media (max-width: 800px) {
  .prefecture-menu { width: 100%; }
  .prefecture-menu > summary { width: 100%; }
  .prefecture-menu__panel {
    position: static;
    width: 100%;
    margin-top: 0.45rem;
    box-shadow: none;
  }
}