/* Mermaid 图表保留自然宽度，并在超出正文区域时允许横向滚动。 */
.mermaid-viewer {
  position: relative;
  margin: 1.5rem 0;
}

.mermaid-viewer .mermaid-toolbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.35rem;
  margin-bottom: 0.5rem;
}

.mermaid-viewer .mermaid-toolbar button {
  min-width: 2.25rem;
  height: 2rem;
  padding: 0 0.6rem;
  border: 1px solid #d9d9d9;
  border-radius: 0.35rem;
  color: inherit;
  background: var(--board-bg-color, #fff);
  cursor: pointer;
}

.mermaid-viewer .mermaid-toolbar button:hover,
.mermaid-viewer .mermaid-toolbar button:focus-visible {
  border-color: #6c63ff;
  outline: none;
}

.mermaid-viewer .mermaid-viewport {
  overflow: auto;
  margin: 0;
}

.mermaid-viewer .mermaid svg {
  display: block;
  max-width: none;
  height: auto;
  margin: 0 auto;
}

.mermaid-viewer:fullscreen {
  overflow: auto;
  padding: 1.5rem;
  background: var(--board-bg-color, #fff);
}

.mermaid-viewer:fullscreen .mermaid-toolbar {
  position: sticky;
  top: 0;
  z-index: 2;
}

/*
 * Fluid 桌面端默认按 2/8/2 分配左右侧栏和正文。
 * 左侧没有内容时缩小其占比，并把空间让给正文和右侧目录。
 */
@media (min-width: 1200px) {
  main > .container-fluid.nopadding-x
    > .row.nomargin-x
    > .side-col:first-child {
    flex: 0 0 8%;
    max-width: 8%;
  }

  main > .container-fluid.nopadding-x
    > .row.nomargin-x
    > .col-lg-8 {
    flex: 0 0 72%;
    max-width: 72%;
  }

  main > .container-fluid.nopadding-x
    > .row.nomargin-x
    > .side-col:last-child {
    flex: 0 0 20%;
    max-width: 20%;
  }

  .post-content {
    padding-right: 6%;
    padding-left: 6%;
  }
}