/* Fix default Material for MkDocs top button layout */
.md-top {
  z-index: 100;
  white-space: nowrap !important;
  display: inline-flex !important;
  align-items: center;
  height: auto !important;
}

/* ==========================================================================
   SHARED APPLE LIQUID GLASS STYLING (Action Bar & Popover Stack)
   ========================================================================== */

.glass-action-bar,
.glass-stack {
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.65);

  /* Subtle Identical Shadow */
  box-shadow: 
    0 4px 12px rgba(0, 0, 0, 0.05),
    inset 0 1px 1px rgba(255, 255, 255, 0.8);
}

.glass-action-bar {
  background: rgba(255, 255, 255, 0.5);
}

/* Higher opacity for popover card text readability */
.glass-stack {
  background: rgba(255, 255, 255, 0.88);
  border-color: rgba(255, 255, 255, 0.85);
}

.glass-action-bar:hover {
  background: rgba(255, 255, 255, 0.65);
  box-shadow: 
    0 6px 16px rgba(0, 0, 0, 0.08),
    inset 0 1px 1px rgba(255, 255, 255, 0.9);
}

/* Dark Mode (Slate) Shared Styling */
[data-md-color-scheme="slate"] .glass-action-bar,
[data-md-color-scheme="slate"] .glass-stack {
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 
    0 4px 12px rgba(0, 0, 0, 0.22),
    inset 0 1px 1px rgba(255, 255, 255, 0.12);
}

[data-md-color-scheme="slate"] .glass-action-bar {
  background: rgba(25, 30, 42, 0.55);
}

[data-md-color-scheme="slate"] .glass-stack {
  background: rgba(30, 36, 50, 0.88);
}

/* ==========================================================================
   LAYOUT & POSITIONING
   ========================================================================== */

/* Mobile-First Floating Action Bar Container */
.glass-action-bar {
  position: fixed;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 99;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.5rem;
  border-radius: 9999px;
  max-height: 2.5rem;
  width: max-content;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

/* Individual Bar Buttons (Links & Toggle Button) */
a.glass-btn, 
a.glass-btn:link, 
a.glass-btn:visited,
button.glass-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  color: var(--md-default-fg-color--light, #444);
  text-decoration: none;
  background: transparent;
  border: none;
  cursor: pointer;
  outline: none;
  font: inherit;
  transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

a.glass-btn svg,
button.glass-btn svg {
  width: 1.15rem;
  height: 1.15rem;
  fill: currentColor;
}

a.glass-btn:hover,
button.glass-btn:hover {
  /* color: var(--md-accent-fg-color, #007bff); */
  color: var(--msd-blue);
  transform: translateY(-2px) scale(1.03);
  text-decoration: none;
}

a.glass-btn:active,
button.glass-btn:active {
  transform: translateY(0) scale(0.95);
}

[data-md-color-scheme="slate"] a.glass-btn,
[data-md-color-scheme="slate"] a.glass-btn:link,
[data-md-color-scheme="slate"] a.glass-btn:visited,
[data-md-color-scheme="slate"] button.glass-btn {
  color: rgba(255, 255, 255, 0.85);
}

/* ==========================================================================
   DONATION DROPDOWN & STACK MENU
   ========================================================================== */

.glass-dropdown {
  position: relative;
  display: inline-flex;
}

/* Stack Menu Container */
.glass-stack {
  position: absolute;
  bottom: calc(100% + 0.6rem);
  right: 50%;
  transform: translateX(50%) translateY(8px);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.4rem;
  border-radius: 1rem;
  min-width: 10.5rem;

  /* Hidden State */
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
}

/* Active Open State */
.glass-stack.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(50%) translateY(0);
}

/* Stack Items */
a.glass-stack-btn,
a.glass-stack-btn:link,
a.glass-stack-btn:visited {
  display: flex;
  align-items: center;
  padding: 0.45rem 0.75rem;
  border-radius: 2.5rem;
  color: var(--md-default-fg-color, #333);
  font-size: 0.75rem;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  background: transparent;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.15s ease;
}

a.glass-stack-btn:hover {
  background-color: rgba(255, 255, 255, 0.75);
  /* color: var(--md-accent-fg-color, #007bff); */
  color: var(--msd-blue);
  transform: translateX(2px);
  text-decoration: none;
}

a.glass-stack-btn:active {
  transform: translateX(0) scale(0.98);
}

[data-md-color-scheme="slate"] a.glass-stack-btn,
[data-md-color-scheme="slate"] a.glass-stack-btn:link,
[data-md-color-scheme="slate"] a.glass-stack-btn:visited {
  color: rgba(255, 255, 255, 0.9);
}

[data-md-color-scheme="slate"] a.glass-stack-btn:hover {
  background-color: rgba(255, 255, 255, 0.15);
  color: #fff;
}

/* Stack Icon Styling (Replicating Bootstrap Utilities) */
a.glass-stack-btn i {
  margin-right: 0.1rem;  /* Replicates Bootstrap 'me-2' */
  font-size: 0.75rem;       /* Slightly larger than the 0.75rem button text */
  color: #6c757d;        /* Replicates Bootstrap 'secondary' color */
  width: 1.25rem;        /* Fixed width so all icon labels align vertically */
  text-align: center;
  transition: color 0.2s ease;
}

/* Icon hover transition */
a.glass-stack-btn:hover i {
  /* color: var(--md-accent-fg-color, #007bff); */
  color: var(--msd-blue);
}

/* Dark Mode (Slate) Icon Color */
[data-md-color-scheme="slate"] a.glass-stack-btn i {
  color: rgba(255, 255, 255, 0.6);
}

[data-md-color-scheme="slate"] a.glass-stack-btn:hover i {
  color: #fff;
}

/* Tablet & Desktop Scaling */
@media screen and (min-width: 60em) {
  .glass-action-bar {
    bottom: 1.5rem;
    padding: 0.4rem 0.6rem;
  }

  a.glass-btn, 
  a.glass-btn:link, 
  a.glass-btn:visited,
  button.glass-btn {
    width: 2.5rem;
    height: 2.5rem;
  }

  a.glass-btn svg,
  button.glass-btn svg {
    width: 1.25rem;
    height: 1.25rem;
  }
}