/* ==========================================================================
   Rolodex — 3D cylindrical card carousel
   BEM: .rolodex__*
   CSS custom properties for easy theming
   ========================================================================== */

:root {
  --rolodex-card-bg: var(--color-bg, #fff);
  --rolodex-card-border: var(--color-border-light, #e0e0e0);
  --rolodex-card-text: var(--color-text, #222);
  --rolodex-card-subtext: var(--color-text-light, #666);
  --rolodex-card-accent: var(--color-link, #333);
  --rolodex-card-width: 220px;
  --rolodex-card-height: 140px;
  --rolodex-radius: 160px;   /* translateZ depth — increase for more spacing */
  --rolodex-scene-height: 340px;
}

/* ── Outer wrapper ─────────────────────────────────────────────────────── */
.rolodex {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  padding: 2rem 0;
  overflow: hidden;
}

.rolodex__label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--rolodex-card-subtext);
}

/* ── 3D scene (perspective container) ─────────────────────────────────── */
.rolodex__scene {
  width: var(--rolodex-card-width);
  height: var(--rolodex-scene-height);
  perspective: 900px;
  position: relative;
}

/* ── Stage (the rotating cylinder) ────────────────────────────────────── */
.rolodex__stage {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  /* JS sets --active-index on this element to rotate the cylinder */
  transform: rotateY(
    calc(var(--active-index, 0) * -1 * (360deg / var(--total-cards, 6)))
  );
}

/* ── Individual card ───────────────────────────────────────────────────── */
.rolodex__card {
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--rolodex-card-width);
  height: var(--rolodex-card-height);
  margin-top: calc(var(--rolodex-card-height) / -2);
  margin-left: calc(var(--rolodex-card-width) / -2);
  box-sizing: border-box;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;

  /* Each card rotates to its position in the cylinder.
     --card-index and --total-cards are set inline by the Liquid template. */
  transform:
    rotateY(calc(var(--card-index) * (360deg / var(--total-cards))))
    translateZ(var(--rolodex-radius));

  background: var(--rolodex-card-bg);
  border: 1px solid var(--rolodex-card-border);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  transition: box-shadow 0.3s ease;
  text-decoration: none;
  color: inherit;
}

.rolodex__card:hover,
.rolodex__card:focus-visible {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.14);
  outline: 2px solid var(--rolodex-card-accent);
  outline-offset: 2px;
}

.rolodex__card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--rolodex-card-text);
  margin: 0 0 0.35rem;
  line-height: 1.3;
}

.rolodex__card-subtitle {
  font-size: 0.78rem;
  color: var(--rolodex-card-subtext);
  margin: 0;
  line-height: 1.4;
}

.rolodex__card-arrow {
  font-size: 0.75rem;
  color: var(--rolodex-card-accent);
  align-self: flex-end;
}

/* ── Navigation buttons ────────────────────────────────────────────────── */
.rolodex__nav {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.rolodex__btn {
  background: none;
  border: 1px solid var(--rolodex-card-border);
  border-radius: 4px;
  width: 36px;
  height: 36px;
  font-size: 1rem;
  cursor: pointer;
  color: var(--rolodex-card-text);
  transition: background 0.15s, color 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.rolodex__btn:hover,
.rolodex__btn:focus-visible {
  background: var(--rolodex-card-accent);
  color: var(--rolodex-card-bg);
  border-color: var(--rolodex-card-accent);
  outline: none;
}

.rolodex__counter {
  font-size: 0.75rem;
  color: var(--rolodex-card-subtext);
  min-width: 3rem;
  text-align: center;
}

/* ── Visually-hidden live region for screen readers ───────────────────── */
.rolodex__sr-live {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ==========================================================================
   Firefox fix
   Firefox has a known rendering bug with transform-style: preserve-3d when
   backface-visibility is involved — cards can appear in the wrong z-order.
   The .is-firefox class is applied by JS on page load (navigator.userAgent
   check). We fall back to a flat stack with opacity-based depth cues.
   Reference: https://bugzilla.mozilla.org/show_bug.cgi?id=1165037
   ========================================================================== */
.is-firefox .rolodex__stage {
  /* preserve-3d still works in Firefox but z-ordering is unreliable.
     We compensate by making non-active cards more transparent via JS-toggled
     .rolodex__card--active, so the visual hierarchy is clear without relying
     on correct 3D z-sort. */
  transform-style: preserve-3d;
}

.is-firefox .rolodex__card {
  /* Reduce opacity on non-active cards in Firefox to restore visual depth */
  opacity: 0.5;
  transition: opacity 0.4s ease, box-shadow 0.3s ease;
}

.is-firefox .rolodex__card--active {
  opacity: 1;
}

/* ==========================================================================
   Reduced-motion: flat accessible list fallback
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .rolodex__scene,
  .rolodex__stage {
    perspective: none;
    transform-style: flat;
    height: auto;
    width: 100%;
    max-width: 480px;
  }

  .rolodex__stage {
    transform: none !important;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .rolodex__card {
    position: static;
    transform: none !important;
    width: 100%;
    margin: 0;
    opacity: 1 !important;
  }

  /* Hide the nav buttons — all cards are visible in the flat list */
  .rolodex__nav {
    display: none;
  }
}