/*!
 * glossary-nav.css v1.1.0
 * Glossary A–Z letter bar — fixed pill docked bottom-center, Sestek palette:
 * magenta indicator disc (white letter riding on it), soft pink hover tint.
 * A single indicator glides between letters (CSS transform transition, JS
 * only repositions it). Letters with no matching section on the page are
 * removed from the bar by default (.is-hidden) or kept muted (.is-disabled)
 * with data-glossary-nav-empty="dim". The whole bar slides up from the
 * bottom edge only while the glossary content is on screen (hidden over
 * the hero / past the footer).
 * Mobile: same bar, edge-to-edge scrollable strip with soft fade masks.
 * JS: js/components/glossary-nav.js
 * https://github.com/roicool/sestek
 */

/* ── Bar — fixed, bottom center, hidden by default (JS adds .is-visible) ─── */
[data-glossary-nav] {
  position: fixed;
  left: 50%;
  bottom: var(--spacing--5, 1.25rem);
  z-index: 90;
  max-width: calc(100vw - var(--spacing--8, 2rem));
  padding: var(--spacing--1-5, 0.375rem);
  border-radius: var(--radius--full, 9999px);
  background: color-mix(in oklch, var(--surface--base, #fff) 85%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border--color-border-muted, #f0f0f0);
  box-shadow: 0 12px 32px -12px rgba(26, 26, 26, .22), 0 1px 2px rgba(26, 26, 26, .05);
  /* hidden state: pushed below the viewport edge */
  transform: translate(-50%, calc(100% + var(--spacing--8, 2rem)));
  opacity: 0;
  visibility: hidden;
  transition:
    transform 0.55s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.4s ease,
    visibility 0s linear 0.55s;
}

[data-glossary-nav].is-visible {
  transform: translate(-50%, 0);
  opacity: 1;
  visibility: visible;
  transition:
    transform 0.55s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.4s ease,
    visibility 0s;
}

/* ── Track — the letter row; scrolls horizontally when it can't fit ──────── */
[data-glossary-nav-track] {
  position: relative;              /* indicator coordinate space */
  display: flex;
  align-items: center;
  gap: var(--spacing--0-5, 0.125rem);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}
[data-glossary-nav-track]::-webkit-scrollbar { display: none; }

/* soft fade at both edges — JS adds .is-overflowing when the strip scrolls */
[data-glossary-nav-track].is-overflowing {
  -webkit-mask-image: linear-gradient(to right,
    transparent 0, #000 var(--spacing--4, 1rem),
    #000 calc(100% - var(--spacing--4, 1rem)), transparent 100%);
  mask-image: linear-gradient(to right,
    transparent 0, #000 var(--spacing--4, 1rem),
    #000 calc(100% - var(--spacing--4, 1rem)), transparent 100%);
}

/* ── Indicator — one disc, created by JS, glides between letters ─────────── */
.glossary-nav__indicator {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  border-radius: var(--radius--full, 9999px);
  background: var(--brand-primary--500, #EC008C);
  box-shadow: 0 6px 16px -6px rgba(236, 0, 140, .55);
  transform-origin: center;
  /* JS sets translateX + width; the transition is what animates the glide */
  transition:
    transform 0.4s cubic-bezier(0.22, 1, 0.36, 1),
    width 0.4s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.25s ease,
    scale 0.25s ease;
  pointer-events: none;
}
.glossary-nav__indicator.is-idle { opacity: 0; scale: 0.5; }

/* ── Letter — square touch target, sits above the indicator ──────────────── */
[data-glossary-nav-letter] {
  position: relative;
  z-index: 1;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--spacing--10, 2.5rem);
  height: var(--spacing--10, 2.5rem);
  border-radius: var(--radius--full, 9999px);
  font-size: var(--text--sm, 0.875rem);
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  color: var(--color-text--base, #1a1a1a);
  transition: background-color 0.25s ease, color 0.25s ease, opacity 0.25s ease;
}

@media (hover: hover) {
  [data-glossary-nav-letter]:hover:not(.is-active):not(.is-disabled) {
    background: var(--brand-primary--100, #fde6f3);
    color: var(--color-text--accent, #EC008C);
  }
}

[data-glossary-nav-letter]:focus-visible {
  outline: 2px solid var(--color-text--accent, #EC008C);
  outline-offset: -2px;
}

/* active letter rides on the magenta indicator — flip the ink to white */
[data-glossary-nav-letter].is-active {
  color: var(--color-text--inverted, #fff);
}

/* empty letters — default mode: removed from the bar entirely (JS sets this) */
[data-glossary-nav-letter].is-hidden {
  display: none;
}

/* empty letters — data-glossary-nav-empty="dim": kept in place, muted */
[data-glossary-nav-letter].is-disabled {
  color: var(--color-text--muted, #71717a);
  opacity: 0.35;
  pointer-events: none;
}

/* ── Mobile — full-width strip hugging the bottom edge ───────────────────── */
@media (max-width: 767px) {
  [data-glossary-nav] {
    bottom: var(--spacing--3, 0.75rem);
    max-width: calc(100vw - var(--spacing--4, 1rem));
  }
  [data-glossary-nav-letter] {
    width: var(--spacing--9, 2.25rem);
    height: var(--spacing--9, 2.25rem);
  }
}

/* ── Reduced motion — everything snaps, nothing glides ───────────────────── */
@media (prefers-reduced-motion: reduce) {
  [data-glossary-nav],
  [data-glossary-nav].is-visible,
  .glossary-nav__indicator,
  [data-glossary-nav-letter] {
    transition: none;
  }
}