.md-header__button.md-logo img {
  height: 2rem;
  width: 2rem;
  background: white;
  border-radius: 0.4rem;
  padding: 2px;
}

/* Mermaid expand-to-modal */
.mermaid-wrapper {
  position: relative;
}
.mermaid-expand-btn {
  position: absolute;
  top: 0.4rem;
  right: 0.4rem;
  background: var(--md-default-bg-color, #fff);
  border: 1px solid var(--md-default-fg-color--lightest, #ddd);
  border-radius: 4px;
  cursor: pointer;
  padding: 4px 6px;
  font-size: 0.75rem;
  line-height: 1;
  opacity: 0;
  transition: opacity 0.15s;
  z-index: 1;
  color: var(--md-default-fg-color--light, #666);
}
.mermaid-wrapper:hover .mermaid-expand-btn {
  opacity: 1;
}
.mermaid-expand-btn:hover {
  background: var(--md-accent-fg-color, #7c4dff);
  color: #fff;
  border-color: transparent;
}
.mermaid-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.82);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
  animation: mermaid-fade-in 0.15s ease;
}
@keyframes mermaid-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}
.mermaid-modal-content {
  width: 90vw;
  max-height: 92vh;
  overflow: auto;
  background: var(--md-default-bg-color, #fff);
  border-radius: 8px;
  padding: 2rem;
  cursor: default;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}
/* The .mermaid element (shadow DOM host) must stretch to fill the modal.
   The SVG inside has width="100%" so it scales with its host. */
.mermaid-modal-content > .mermaid {
  width: 100%;
  max-width: 100%;
  display: flex;
  justify-content: center;
}
.mermaid-modal-close {
  position: fixed;
  top: 1rem;
  right: 1.5rem;
  z-index: 10000;
  background: none;
  border: none;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  line-height: 1;
  opacity: 0.7;
  transition: opacity 0.15s;
}
.mermaid-modal-close:hover {
  opacity: 1;
}