siyuan/app/src/assets/scss/_layout.scss

.layout {
  &__wnd--active .layout-tab-bar .item--focus {
    &:after {
      background-color: var(--b3-theme-primary);
    }

    & > .item__text {
      color: var(--b3-theme-on-background);
    }
  }

  &__tab--active {
    .b3-list--background .b3-list-item--focus:not(.dragover):not(.dragover__top):not(.dragover__bottom) {
      background-color: var(--b3-theme-primary-lightest);
    }

    .graph__svg,
    .inbox__list {
      background-color: var(--b3-theme-background);
    }
  }

  &__resize {
    cursor: row-resize;
    margin: -3px 0;
    height: 6px;
    width: 100%;
    position: relative;
    z-index: 2;

    &:hover:after {
      background-color: var(--b3-scroll-color);
    }

    &:after {
      content: "";
      width: 100%;
      height: .5px;
      display: block;
      background-color: var(--b3-border-color);
      top: 3px;
      position: absolute;
      left: 0;
      transition: var(--b3-transition);
    }

    &--lr {
      cursor: col-resize;
      width: 6px;
      margin: 0 -6px 0 0;
      height: auto;

      &:after {
        top: 0;
        width: .5px;
        left: 0;
        height: 100%;
      }
    }
  }

  &__empty {
    display: flex;
    height: 100%;
    justify-content: center;
    flex-direction: column;
    width: 100%;
    background-color: var(--b3-theme-background);
    align-items: center;

    .b3-list-item {
      width: 204px;
      white-space: nowrap;
      font-size: 17px;
      color: var(--b3-theme-on-surface);
      margin-top: 8px !important;

      &:hover {
        color: var(--b3-theme-on-background);
      }
    }

    .b3-list-item__graphic {
      margin-right: 8px;
      height: 16px;
      width: 16px;
    }
  }

  &-tab {
    &-container {
      display: flex;
      position: relative;
      background-color: var(--b3-theme-surface);
      user-select: none;

      &__drag {
        background-color: var(--b3-theme-primary-lightest);
        position: absolute;
        z-index: 100;
        height: 100%;
        width: 100%;
        transition: var(--b3-transition);
      }
    }

    &-bar {
      list-style: none;
      align-items: center;
      overflow: auto;
      position: relative;
      background-color: var(--b3-theme-surface);

      &::-webkit-scrollbar {
        display: none;
      }

      &--drag {
        background-color: var(--b3-theme-primary-lightest);
      }

      &--readonly {
        flex-shrink: 0;
        min-width: 71px;
      }

      .item {
        line-height: 22px;
        cursor: pointer;
        user-select: none;
        display: flex;
        align-items: center;
        transition: var(--b3-transition);
        min-height: 42px;
        position: relative;
        max-width: 186px;
        flex-shrink: 0;
        overflow: hidden;

        &--full {
          max-width: none;
          flex: 1;

          &.item--focus:after {
            background-color: var(--b3-theme-primary);
          }
        }

        &:hover:not(.item--focus):not(.item--readonly) .item__text {
          color: var(--b3-theme-on-background);
        }

        &:hover,
        &.item--focus {
          .item__close svg {
            opacity: 1;
          }
        }

        &--readonly {
          padding-left: 13px;
          max-width: none;

          .item__close svg {
            opacity: 1;
          }
        }

        &--pin {
          flex: none;
          min-width: 42px;

          .item__text {
            max-width: 148px;
            font-style: normal;
            color: var(--b3-theme-on-background);
          }

          .item__graphic,
          .item__icon {
            padding: 0 12px;
          }

          .item__close {
            display: none;
          }
        }

        &--focus:after {
          content: "";
          width: 100%;
          height: 3px;
          border-radius: 6px;
          bottom: 0;
          position: absolute;
          background-color: var(--b3-theme-background-light);
        }

        &--unupdate {
          font-style: italic;
          color: var(--b3-theme-on-surface);
        }

        &__icon {
          padding: 4px 0 4px 8px;
          line-height: 22px;
          flex-shrink: 0;

          & > img,
          & > svg {
            float: left;
            height: 18px;
            width: 18px;
            border-radius: 2px;
            margin-top: 1px;
          }
        }

        &__graphic {
          padding: 4px 0 4px 8px;
          height: 14px;
          width: 14px;
        }

        &__text {
          text-align: center;
          -webkit-font-smoothing: subpixel-antialiased;
          color: var(--b3-theme-on-surface);
          transition: var(--b3-transition);
          padding: 0 8px;
          white-space: nowrap;
          overflow: hidden;
          -webkit-mask-image: linear-gradient(to left, rgba(0, 0, 0, 0) 0, #000 12px);
        }

        &__close {
          padding: 13px 8px 13px 0;
          display: flex;
          align-items: center;

          svg {
            border-radius: 10px;
            height: 8px;
            width: 8px;
            color: var(--b3-theme-on-surface);
            transition: var(--b3-transition);
            padding: 4px;
            opacity: 0;
          }

          &:hover svg {
            color: var(--b3-theme-on-background);
            background-color: var(--b3-theme-background-light);
          }
        }
      }
    }
  }
}

.dock {
  height: 42px;
  display: flex;
  padding: 0 42px;
  user-select: none;
  background-color: var(--b3-theme-surface);

  &#dockLeft {
    border-right: .5px solid var(--b3-border-color);
  }

  &#dockRight {
    border-left: .5px solid var(--b3-border-color);
  }

  &#dockTop {
    border-bottom: .5px solid var(--b3-border-color);
  }

  &#dockBottom {
    border-top: .5px solid var(--b3-border-color);
  }

  svg {
    height: 16px;
    width: 16px;
  }

  &--vertical {
    width: 42px;
    flex-direction: column;
    height: 100%;
    padding: 0;

    .dock__item {
      &[data-index="0"]:after {
        top: -32px;
        bottom: auto;
      }

      &[data-index="1"]:after {
        bottom: 100%;
      }
    }
  }

  &__item {
    padding: 8px;
    color: var(--b3-theme-on-surface-light);
    display: flex;
    border-radius: 6px;
    margin: 5px;

    &:hover,
    &--active {
      background-color: var(--b3-theme-background-light);
    }

    &--activefocus {
      color: var(--b3-theme-on-primary) !important;
      background-color: var(--b3-theme-primary) !important;
    }
  }
}