.manual-topbar {
  align-items: center;
  background: #ffffff;
  border-bottom: 1px solid #d9e2ea;
  box-shadow: 0 8px 24px rgba(19, 33, 46, 0.08);
  display: flex;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  justify-content: space-between;
  left: 0;
  padding: 10px 18px;
  position: sticky;
  right: 0;
  top: 0;
  z-index: 20;
}

.manual-topbar a {
  color: #073d63;
  font-weight: 700;
  text-decoration: none;
}

.manual-topbar__brand {
  align-items: center;
  display: inline-flex;
}

.manual-topbar__brand img {
  height: 48px;
  width: auto;
}

.manual-topbar__links {
  display: flex;
  gap: 14px;
}

.manual-side-nav {
  background: #ffffff;
  border: 1px solid #d9e2ea;
  border-radius: 8px;
  box-shadow: 0 10px 28px rgba(19, 33, 46, 0.1);
  display: flex;
  flex-direction: column;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  gap: 2px;
  left: 18px;
  max-height: calc(100vh - 104px);
  overflow: auto;
  padding: 14px;
  position: fixed;
  top: 86px;
  width: 248px;
  z-index: 15;
}

.manual-side-nav strong {
  border-bottom: 1px solid #d9e2ea;
  color: #14212d;
  font-size: 15px;
  margin-bottom: 6px;
  padding: 0 4px 10px;
}

.manual-side-nav a {
  border-radius: 6px;
  color: #405261;
  font-size: 13px;
  line-height: 1.35;
  padding: 7px 8px;
  text-decoration: none;
}

.manual-side-nav a:hover,
.manual-side-nav a:focus-visible {
  background: #e8f1f8;
  color: #073d63;
  outline: none;
}

:target {
  scroll-margin-top: 86px;
}

@media (max-width: 1180px) {
  .manual-side-nav {
    border-left: 0;
    border-radius: 0;
    border-right: 0;
    box-shadow: none;
    flex-direction: row;
    left: 0;
    max-height: none;
    overflow-x: auto;
    padding: 8px 12px;
    position: sticky;
    top: 69px;
    width: 100%;
    z-index: 19;
  }

  .manual-side-nav strong {
    border-bottom: 0;
    flex: 0 0 auto;
    margin: 0 6px 0 0;
    padding: 7px 8px;
    white-space: nowrap;
  }

  .manual-side-nav a {
    flex: 0 0 auto;
    white-space: nowrap;
  }
}

@media print {
  .manual-topbar,
  .manual-side-nav {
    display: none;
  }
}

@media (max-width: 620px) {
  .manual-topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .manual-side-nav {
    top: 104px;
  }

  :target {
    scroll-margin-top: 146px;
  }
}