.detail-side-nav {
  position: fixed;
  top: 50%;
  right: 14px;
  transform: translateY(-50%);
  z-index: 70;
  display: flex;
  align-items: center;
  gap: 10px;
}

.detail-side-nav:hover,
.detail-side-nav.is-open {
  transform: translateY(-50%);
}

.detail-side-nav__edge {
  width: auto;
  min-width: 54px;
  min-height: 54px;
  padding: 10px 12px;
  border-radius: 999px;
  background: rgba(17, 18, 20, 0.84);
  box-shadow: -8px 10px 24px rgba(17, 18, 20, 0.12);
  position: relative;
  display: grid;
  place-items: center;
}

.detail-side-nav__edge::after {
  content: "目录";
  color: rgba(255, 255, 255, 0.76);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.detail-side-nav__panel {
  overflow: hidden;
  padding: 16px 14px 16px 14px;
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(26, 28, 32, 0.76) 0%, rgba(18, 20, 24, 0.72) 100%);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: -12px 18px 42px rgba(17, 18, 20, 0.14);
  width: 0;
  opacity: 0;
  transform: translateX(10px);
  pointer-events: none;
  transition: width 0.22s ease, opacity 0.22s ease, transform 0.22s ease;
}

.detail-side-nav__title {
  margin: 0 0 12px;
  color: rgba(255, 255, 255, 0.38);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0;
  transform: translateX(8px);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.detail-side-nav__list {
  display: grid;
  gap: 6px;
}

.detail-side-nav__link {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 10px 10px;
  border-radius: 14px;
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  font-size: 0.9rem;
  line-height: 1.4;
  background: transparent;
  transition:
    background-color 0.18s ease,
    color 0.18s ease,
    transform 0.18s ease,
    opacity 0.18s ease;
  opacity: 0;
  transform: translateX(8px);
}

.detail-side-nav__link:hover,
.detail-side-nav__link.is-active {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  transform: translateX(-3px);
  opacity: 1;
}

.detail-side-nav__link-index {
  color: rgba(255, 255, 255, 0.36);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
}

.detail-side-nav__link-text {
  position: relative;
}

.detail-side-nav__link-text::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 50%;
  width: 2px;
  height: 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  transform: translateY(-50%);
  transition: background-color 0.18s ease, height 0.18s ease;
}

.detail-side-nav__link:hover .detail-side-nav__link-text::before,
.detail-side-nav__link.is-active .detail-side-nav__link-text::before {
  background: rgba(255, 255, 255, 0.58);
  height: 20px;
}

.detail-side-nav.is-open .detail-side-nav__title,
.detail-side-nav:hover .detail-side-nav__title {
  opacity: 1;
  transform: translateX(0);
}

.detail-side-nav.is-open .detail-side-nav__panel,
.detail-side-nav:hover .detail-side-nav__panel {
  width: 228px;
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.detail-side-nav.is-open .detail-side-nav__link,
.detail-side-nav:hover .detail-side-nav__link {
  opacity: 1;
  transform: translateX(0);
}

@media (max-width: 1180px) {
  .detail-side-nav {
    display: none;
  }
}