/* --- navigation --- */
.nav-arrow {
  position: fixed;
  bottom: 32px;
  z-index: 999;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.06);
  border: 1px solid #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #1e3a8a;
  font-size: 20px;
  font-weight: 700;
  transition: background 0.15s;
}
.nav-arrow:hover {
  background: rgba(37, 99, 235, 0.12);
}
.nav-prev {
  left: 32px;
}
.nav-next {
  right: 32px;
}
.nav-page-num {
  position: fixed;
  bottom: 44px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  font-size: 13px;
  color: #64748b;
  letter-spacing: 0.08em;
}

.nav-fullscreen {
  position: fixed;
  top: 32px;
  right: 10px;
  z-index: 999;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.06);
  border: 1px solid #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #1e3a8a;
  transition: background 0.15s;
}
.nav-fullscreen:hover {
  background: rgba(37, 99, 235, 0.12);
}
.nav-fullscreen svg {
  width: 20px;
  height: 20px;
}