/* ==========================================================================
   Mermaid diagram zoom button and lightbox overlay
   ========================================================================== */

/* --- Wrapper container --- */
.mermaid-zoom-container {
  position: relative;
  display: block;
  max-width: 100%;
}

/* --- Zoom overlay (full-diagram hover) --- */
.mermaid-zoom-btn {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  padding: 0;
  border: none;
  border-radius: 0;
  background: transparent;
  cursor: zoom-in;
  opacity: 0;
  transition: opacity 0.25s ease, background 0.25s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  font: inherit;
}

.mermaid-zoom-container:hover .mermaid-zoom-btn {
  opacity: 1;
  background: rgba(128, 128, 128, 0.06);
}

/* Magnifying glass icon circle via ::after */
.mermaid-zoom-btn::after {
  content: "\1F50D"; /* Unicode magnifying glass */
  font-size: 20px;
  width: 48px;
  height: 48px;
  line-height: 48px;
  text-align: center;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.45);
  color: #fff;
  opacity: 0;
  transform: scale(0.8);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.mermaid-zoom-container:hover .mermaid-zoom-btn::after {
  opacity: 1;
  transform: scale(1);
}

/* --- Lightbox overlay --- */
.mermaid-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

.mermaid-overlay--active {
  opacity: 1;
}

/* SVG container in overlay */
.mermaid-overlay-content {
  position: relative;
  width: 92vw;
  max-width: 92vw;
  height: 90vh;
  max-height: 90vh;
  overflow: hidden;
  background: var(--md-default-bg-color, #fff);
  border-radius: 8px;
  padding: 24px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
  box-sizing: border-box;
}

/* Scale SVG to fill overlay while maintaining aspect ratio */
.mermaid-overlay-content svg {
  position: absolute;
  left: 0;
  top: 0;
  display: block;
  transform-origin: 0 0;
}

/* Close button */
.mermaid-overlay-close {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 1001;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: var(--md-default-bg-color, #fff);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  cursor: pointer;
  font-size: 28px;
  line-height: 44px;
  text-align: center;
  color: var(--md-default-fg-color, #000);
  transition: background 0.15s ease;
}

.mermaid-overlay-close:hover {
  background: #eee;
}

/* Prevent body scroll when overlay is open */
body.mermaid-overlay-open {
  overflow: hidden;
}

/* --- Dark mode --- */
[data-md-color-scheme="slate"] .mermaid-zoom-container:hover .mermaid-zoom-btn {
  background: rgba(255, 255, 255, 0.04);
}

[data-md-color-scheme="slate"] .mermaid-zoom-btn::after {
  background: rgba(255, 255, 255, 0.25);
  color: #fff;
}

[data-md-color-scheme="slate"] .mermaid-overlay {
  background: rgba(0, 0, 0, 0.75);
}

[data-md-color-scheme="slate"] .mermaid-overlay-content {
  background: var(--md-default-bg-color, #1e1e1e);
}

[data-md-color-scheme="slate"] .mermaid-overlay-close {
  background: var(--md-default-bg-color, #2e2e2e);
  color: var(--md-default-fg-color, #eee);
}

[data-md-color-scheme="slate"] .mermaid-overlay-close:hover {
  background: #444;
}

/* --- Mobile adjustments --- */
@media (max-width: 600px) {
  .mermaid-overlay-content {
    width: 100vw;
    max-width: 100vw;
    height: 100vh;
    max-height: 100vh;
    border-radius: 0;
    padding: 12px;
  }

  .mermaid-zoom-btn::after {
    width: 56px;
    height: 56px;
    line-height: 56px;
    font-size: 24px;
  }
}

/* --- Touch devices: always show overlay subtly (no hover available) --- */
@media (hover: none) and (pointer: coarse) {
  .mermaid-zoom-btn {
    opacity: 1;
    background: rgba(128, 128, 128, 0.04);
  }

  .mermaid-zoom-btn::after {
    opacity: 0.6;
    transform: scale(0.7);
  }

  .mermaid-zoom-container:hover .mermaid-zoom-btn {
    opacity: 1;
    background: rgba(128, 128, 128, 0.04);
  }

  .mermaid-zoom-container:hover .mermaid-zoom-btn::after {
    opacity: 0.6;
    transform: scale(0.7);
  }
}