/* Alphabetic browsing on the index page. */
body { font-family: 'Segoe UI', 'Selawik', system-ui, sans-serif; }
#links a { font-variant-caps: normal; text-transform: none; }
#links .cap-initial { font-size: 1em; letter-spacing: .12em; }
#links .cap-small { font-size: .82em; letter-spacing: .16em; }

.alphabet-corner {
  position: fixed;
  top: 50%;
  bottom: 0;
  width: clamp(36px, 10vw, 44px);
  height: auto;
  z-index: 21;
  padding: 0;
  border: 0;
  background: transparent;
  opacity: 0;
  cursor: ns-resize;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}
#alphabet-trigger { left: 0; }
#alphabet-trigger-right { right: 0; }
.alphabet-corner:focus-visible { opacity: 1; outline: 2px solid #83d6fa; outline-offset: -8px; }

#alphabet-rail {
  position: fixed;
  left: max(0px, env(safe-area-inset-left));
  top: 38%;
  bottom: 12%;
  width: 44px;
  height: auto;
  z-index: 20;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(-12px);
  transition: opacity 220ms ease-out, transform 240ms cubic-bezier(.2,.8,.2,1), visibility 220ms;
  -webkit-user-select: none;
  user-select: none;
  touch-action: none;
}
#alphabet-rail.on-right {
  left: auto;
  right: max(0px, env(safe-area-inset-right));
  transform: translateX(12px);
}
#alphabet-rail.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  cursor: ns-resize;
  transform: translateX(0);
}
#alphabet-track {
  display: grid;
  grid-template-rows: repeat(var(--letter-count, 1), minmax(0, 1fr));
  align-items: center;
  width: 100%;
  height: 100%;
}
#alphabet-track span {
  display: grid;
  place-items: center;
  height: 100%;
  color: #969696;
  font: 500 clamp(12px, 2.05vh, 16px)/1 'Segoe UI', 'Selawik', system-ui, sans-serif;
  transform: translateX(var(--shift, 0px)) scale(var(--scale, 1));
  transform-origin: center center;
  position: relative;
  isolation: isolate;
  opacity: var(--alpha, .75);
  transition: transform 105ms ease-out, color 105ms ease-out, opacity 105ms ease-out;
  will-change: transform;
}
#alphabet-track span::before {
  content: '';
  position: absolute;
  width: 27px;
  height: 27px;
  top: 50%;
  left: 50%;
  border-radius: 50%;
  background: #6958d6;
  opacity: 0;
  transform: translate(-50%, -50%);
  z-index: -1;
  transition: opacity 105ms ease-out;
}
#alphabet-track span.is-current {
  color: #fff;
  font-weight: 700;
  text-shadow: 0 0 7px rgba(255,255,255,.35);
}
#alphabet-track span.is-current::before { opacity: 1; }

body.alpha-sorted {
  align-items: flex-start;
  justify-content: flex-start;
  padding-top: 0;
  padding-bottom: 24px;
}
body.alpha-sorted #links {
  max-width: 34rem;
  padding-top: 26vh;
  padding-left: 56px;
  padding-right: 12px;
  padding-bottom: 3rem;
  text-align: left;
  gap: .35rem;
}
body.alpha-sorted.alpha-right #links {
  padding-left: 12px;
  padding-right: 56px;
}
body.alpha-sorted #links > li:not(.alpha-heading) { min-height: 1.5rem; }
body.alpha-sorted #links > li { transition: opacity 290ms ease-out; }
body.alpha-sorted #links > li.alpha-reveal { opacity: 0; }
body.alpha-sorted #links { overflow-anchor: none; }
/* Keep every row's layout box while showing only the active section. */
body.alpha-scrubbing #links > li:not(.alpha-active) { visibility: hidden; }
#links > li[hidden] { display: none !important; }
body.alpha-sorted #links a {
  display: block;
  font-size: clamp(1rem, 3.7vw, 1.35rem);
  letter-spacing: .012em;
  line-height: 1.2;
}
body.alpha-sorted #links .alpha-heading {
  margin-top: 2.65rem;
  color: #7fcdf2;
  font: 300 clamp(1.7rem, 7.7vw, 2rem)/1.1 'Segoe UI', 'Selawik', system-ui, sans-serif;
  letter-spacing: .02em;
  margin-bottom: .75rem;
  scroll-margin-top: 26vh;
}
body.alpha-sorted #links .alpha-heading:first-child { margin-top: 0; }
footer { color: #393939; }
footer a { color: inherit; text-decoration: none; }

@media (prefers-reduced-motion: reduce) {
  .alphabet-corner, #alphabet-rail, #alphabet-track span, #alphabet-track span::before,
  body.alpha-sorted #links > li { transition-duration: 0ms; }
}