/*
 * floating-nav.css
 *
 * Styles for the floating Home/Previous/Next action bar (FAB) injected
 * by floating-nav.js. The FAB is fixed to the bottom-right corner of
 * the viewport, hidden by default, and fades in once the user starts
 * scrolling. It disappears at the very bottom of the page so it
 * doesn't overlap the bottom-of-page nav bar from sidebar-nav.js.
 *
 * Three buttons in a row: [⌂ Home] [← Previous] [Next →]
 *   - On wide screens: shows icon + label
 *   - On narrow screens (< 60em): shows icon only, label as tooltip
 *   - Disabled buttons (first/last page) are greyed out
 *   - On very narrow screens (< 40em): only show Home + Next (most-used)
 */

/* ---- Container ---- */

.hh-fab {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  display: flex;
  flex-direction: row;
  gap: 0.4rem;
  padding: 0.4rem;
  background: var(--md-default-bg-color);
  border: 1px solid var(--md-primary-fg-color);
  border-radius: 2rem;
  box-shadow:
    0 4px 12px rgba(0, 0, 0, 0.15),
    0 2px 4px rgba(0, 0, 0, 0.1);

  /* Hidden by default; JS adds .hh-fab--visible to fade in */
  opacity: 0;
  transform: translateY(1.5rem) scale(0.85);
  pointer-events: none;
  transition:
    opacity 0.3s ease-out,
    transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.hh-fab--visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

/* ---- Buttons ---- */

.hh-fab-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-width: 2.4rem;
  height: 2.4rem;
  padding: 0 0.85rem;
  border-radius: 1.6rem;
  background: transparent;
  color: var(--md-primary-fg-color);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  border: 1px solid transparent;
  transition:
    background 0.15s,
    color 0.15s,
    transform 0.15s,
    box-shadow 0.15s;
}

.hh-fab-btn:hover {
  background: var(--md-primary-fg-color);
  color: var(--md-primary-bg-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.hh-fab-btn:active {
  transform: translateY(0);
}

.hh-fab-btn--disabled,
.hh-fab-btn--disabled:hover {
  background: transparent;
  color: var(--md-default-fg-color--light);
  cursor: not-allowed;
  pointer-events: none;
  transform: none;
  box-shadow: none;
  opacity: 0.45;
}

/* ---- Icon + label sizing ---- */

.hh-fab-icon {
  font-size: 1.1rem;
  line-height: 1;
  font-weight: 700;
}

.hh-fab-label {
  font-size: 0.82rem;
}

/* ---- Responsive: icon-only on narrow screens ---- */

@media (max-width: 60em) {
  .hh-fab {
    bottom: 1rem;
    right: 1rem;
    gap: 0.25rem;
    padding: 0.3rem;
  }
  .hh-fab-btn {
    min-width: 2.2rem;
    height: 2.2rem;
    padding: 0 0.55rem;
  }
  .hh-fab-label {
    /* Show only the most important label (Home) on narrow screens */
  }
  .hh-fab-prev .hh-fab-label,
  .hh-fab-next .hh-fab-label {
    display: none;
  }
  .hh-fab-home .hh-fab-label {
    display: none;
  }
}

@media (max-width: 40em) {
  /* On very narrow screens, hide Previous to make room */
  .hh-fab-prev {
    display: none;
  }
  .hh-fab {
    bottom: 0.7rem;
    right: 0.7rem;
  }
}

/* ---- Dark mode adjustment ---- */

[data-md-color-scheme="slate"] .hh-fab {
  background: var(--md-default-bg-color);
  border-color: var(--md-primary-fg-color);
  box-shadow:
    0 4px 12px rgba(0, 0, 0, 0.4),
    0 2px 4px rgba(0, 0, 0, 0.25);
}

/* ---- Print: hide the FAB so it doesn't appear in PDFs ---- */

@media print {
  .hh-fab {
    display: none !important;
  }
}