/*
  Mermaid 图放大查看器样式。

  所有选择器均使用 mermaid-zoom 命名空间。正文中的 Mermaid 宿主不设新的
  尺寸规则,避免影响主题的 SVG 渲染;只为放大按钮增加一个轻量操作行。
*/

.mermaid-zoom__figure {
  position: relative;
}

.mermaid-zoom__trigger {
  position: absolute;
  right: .4rem;
  bottom: .4rem;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  min-height: 0;
  margin: 0;
  padding: .42rem;
  border: 1px solid var(--pm-line, var(--md-default-fg-color--lightest));
  border-radius: .45rem;
  color: var(--md-default-fg-color--light);
  background: var(--md-default-bg-color);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: color .15s ease, background-color .15s ease, border-color .15s ease,
              opacity .15s ease;
}

.mermaid-zoom__figure:hover > .mermaid-zoom__trigger,
.mermaid-zoom__trigger:focus-visible {
  opacity: .94;
  pointer-events: auto;
}

.mermaid-zoom__trigger svg {
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

@media (hover: none) {
  .mermaid-zoom__figure > .mermaid-zoom__trigger {
    opacity: .94;
    pointer-events: auto;
  }
}

.mermaid-zoom__trigger:hover,
.mermaid-zoom__trigger:focus-visible {
  border-color: var(--md-accent-fg-color);
  color: var(--md-accent-fg-color);
  background: var(--md-accent-fg-color--transparent);
}

.mermaid-zoom__trigger:focus-visible,
.mermaid-zoom__button:focus-visible {
  outline: 2px solid var(--md-accent-fg-color);
  outline-offset: 2px;
}

.mermaid-zoom__dialog {
  width: min(96vw, 90rem);
  height: min(92dvh, 62rem);
  max-width: none;
  max-height: none;
  padding: 0;
  border: 1px solid var(--pm-line, var(--md-default-fg-color--lightest));
  border-radius: .8rem;
  color: var(--md-default-fg-color);
  background: var(--md-default-bg-color);
  box-shadow: var(--md-shadow-z3, 0 1rem 3rem rgba(0, 0, 0, .28));
}

.mermaid-zoom__dialog::backdrop {
  background: rgba(0, 0, 0, .58);
}

.mermaid-zoom__shell {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  min-height: 0;
}

.mermaid-zoom__header {
  display: flex;
  align-items: center;
  gap: .8rem;
  flex: none;
  min-height: 3.4rem;
  padding: .65rem .85rem .65rem 1rem;
  border-bottom: 1px solid var(--pm-line, var(--md-default-fg-color--lightest));
}

.mermaid-zoom__title {
  flex: 1;
  min-width: 0;
  margin: 0;
  color: var(--md-default-fg-color);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.35;
}

.mermaid-zoom__actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: .35rem;
}

.mermaid-zoom__button {
  min-width: 2.25rem;
  min-height: 2.25rem;
  padding: .35rem .6rem;
  border: 1px solid var(--pm-line, var(--md-default-fg-color--lightest));
  border-radius: .4rem;
  color: var(--md-default-fg-color--light);
  background: transparent;
  cursor: pointer;
  font: inherit;
  font-size: .75rem;
  line-height: 1.2;
}

.mermaid-zoom__button:hover {
  border-color: var(--md-accent-fg-color);
  color: var(--md-accent-fg-color);
  background: var(--md-accent-fg-color--transparent);
}

.mermaid-zoom__button--close {
  margin-left: .2rem;
  border-color: var(--md-accent-fg-color);
  color: var(--md-accent-fg-color);
}

.mermaid-zoom__scale {
  min-width: 3.2rem;
  color: var(--md-default-fg-color--light);
  font-size: .75rem;
  text-align: center;
}

.mermaid-zoom__hint {
  flex: none;
  margin: 0;
  padding: .5rem 1rem;
  color: var(--md-default-fg-color--light);
  font-size: .75rem;
  line-height: 1.5;
}

.mermaid-zoom__viewport {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  overscroll-behavior: contain;
  cursor: grab;
  touch-action: none;
}

.mermaid-zoom__viewport.is-dragging {
  cursor: grabbing;
  user-select: none;
}

/* 画布填满视口,图表平移不受内容尺寸限制,模拟无限画布。 */
.mermaid-zoom__canvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.mermaid-zoom__canvas > .mermaid {
  display: block;
  flex: none;
  margin: 0;
  pointer-events: auto;
  transform-origin: top left;
  will-change: transform;
}

@media (max-width: 44rem) {
  .mermaid-zoom__dialog {
    width: calc(100vw - 1rem);
    height: calc(100dvh - 1rem);
    border-radius: .55rem;
  }

  .mermaid-zoom__header {
    align-items: flex-start;
    flex-wrap: wrap;
    gap: .5rem;
  }

  .mermaid-zoom__title {
    flex-basis: 100%;
  }

  .mermaid-zoom__actions {
    width: 100%;
    justify-content: flex-start;
  }

  .mermaid-zoom__button--close {
    margin-left: auto;
  }
}

@media (max-width: 44rem) and (orientation: portrait) {
  .mermaid-zoom__dialog {
    margin: .5rem;
    padding-bottom: env(safe-area-inset-bottom);
  }
}

@media (prefers-reduced-motion: reduce) {
  .mermaid-zoom__trigger,
  .mermaid-zoom__button {
    transition: none;
  }
}

@media print {
  .mermaid-zoom__trigger,
  .mermaid-zoom__dialog {
    display: none !important;
  }
}