/*
 * MDUI layout 会给栏位写入 position:absolute；这里明确覆盖为视口固定，
 * 保留 scroll-behavior=elevate 的滚动阴影，但不让 Topbar 随正文离开。
 */
.app-top-bar {
  position: fixed !important;
  top: 0 !important;
  --mdui-comp-ripple-state-layer-color: transparent;
}

.topbar-title {
  display: block;
  visibility: hidden;
  min-width: 0;
}

.topbar-title--mobile {
  display: block;
}

.topbar-desktop-spacer,
.topbar-desktop-nav {
  display: none;
}

.topbar-actions,
.topbar-profile-cluster {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  gap: 0.125rem;
}

mdui-button-icon.topbar-mobile-control,
mdui-button-icon.topbar-mobile-home-btn,
mdui-button-icon.topbar-archive-btn,
mdui-button-icon.topbar-search-toggle,
mdui-button-icon.topbar-theme-toggle,
mdui-button-icon.topbar-profile-trigger-btn,
mdui-button-icon.topbar-profile-social-bar__btn {
  flex-shrink: 0;
  color: rgb(var(--mdui-color-on-surface-variant));
}

mdui-button-icon.topbar-mobile-home-btn[aria-current='page'] {
  color: rgb(var(--mdui-color-primary));
}

.topbar-profile-social-bar {
  display: none;
}

.topbar-profile-trigger__avatar {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  object-fit: cover;
  object-position: center center;
  border: 2px solid rgb(var(--mdui-color-surface-container-high));
  box-sizing: border-box;
  display: block;
}

.topbar-profile-trigger__avatar-icon {
  width: 1.375rem;
  height: 1.375rem;
  color: rgb(var(--mdui-color-on-surface-variant));
  font-size: 1.375rem;
}

.topbar-profile-social-bar__icon {
  font-size: 1rem;
  line-height: 1;
}

.site-category-drawer__list {
  padding: 0.5rem;
}

.site-category-drawer__section {
  padding: 1rem 0.75rem 0.75rem;
}

.site-category-drawer__toc .post-toc-scroll {
  max-height: min(62vh, 34rem);
  padding: 0.25rem 0.5rem 0.5rem 0.375rem;
}

.site-category-drawer__divider {
  margin: 0.25rem 0.5rem;
}

mdui-navigation-drawer.site-category-drawer::part(panel) {
  width: min(20rem, calc(100vw - 2rem));
}

@media (min-width: 840px) {
  mdui-button-icon.topbar-mobile-control,
  mdui-button-icon.topbar-mobile-home-btn,
  .topbar-title--mobile {
    display: none;
  }

  .topbar-title:not(.topbar-title--mobile) {
    display: block;
    visibility: visible;
  }

  .site-category-drawer__toc {
    display: none;
  }

  .topbar-desktop-spacer {
    display: flex;
    flex: 1 1 0;
    min-inline-size: 0;
  }

  .topbar-desktop-nav {
    display: flex;
    flex: 0 1 auto;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: flex-start;
    gap: 0.25rem;
    inline-size: max-content;
    min-inline-size: 0;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .topbar-desktop-nav::-webkit-scrollbar {
    display: none;
  }

  .topbar-actions {
    flex: 1 0 0;
    justify-content: flex-end;
    min-inline-size: max-content;
  }

  .topbar-profile-social-bar {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    gap: 0.05rem;
  }

  .topbar-desktop-link {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
    min-height: 3rem;
    padding: 0 0.875rem;
    border-bottom: 0.0625rem solid transparent;
    color: rgb(var(--mdui-color-primary));
    font-size: 1rem;
    font-weight: 300;
    letter-spacing: 0.01em;
    line-height: 1.2;
    text-decoration: none;
    white-space: nowrap;
    word-break: normal;
    overflow-wrap: normal;
  }

  .topbar-desktop-link--active,
  .topbar-desktop-link[aria-current='page'] {
    font-weight: 500;
  }

  .topbar-desktop-link:hover,
  .topbar-desktop-link:focus-visible {
    border-bottom-color: rgb(var(--mdui-color-primary));
  }
}