/* =================================================================
   PruTAN Deck — Slide Navigator Dropdown
   Position via data-deck-nav="left|right|none" on .reveal
   ================================================================= */

/* --- Collapsed pill (the trigger) ----------------------------- */
.deck-nav-toggle {
  position: fixed;
  bottom: 18px;
  left: 18px;
  z-index: 100;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.96);
  border: 1px solid var(--line);
  border-radius: 9999px;
  padding: 8px 14px 8px 12px;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--ink);
  cursor: pointer;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  transition: all 0.18s var(--ease);
}
.deck-nav-toggle:hover {
  border-color: var(--prutan-indigo);
  box-shadow: 0 6px 18px rgba(99,102,241,0.18);
  transform: translateY(-1px);
}
.deck-nav-toggle:focus-visible {
  outline: 2px solid var(--prutan-indigo);
  outline-offset: 2px;
}

.deck-nav-toggle .nav-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px; height: 18px;
  color: var(--prutan-indigo);
}
.deck-nav-toggle .nav-counter {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.deck-nav-toggle .nav-sep {
  width: 1px; height: 14px; background: var(--line);
}
.deck-nav-toggle .nav-current {
  font-weight: 500;
  color: var(--ink);
  max-width: 280px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.deck-nav-toggle .nav-chevron {
  width: 12px; height: 12px;
  color: var(--muted);
  transition: transform 0.2s var(--ease);
}
.deck-nav-toggle[aria-expanded="true"] .nav-chevron { transform: rotate(180deg); }

/* Right-side variant */
[data-deck-nav="right"] .deck-nav-toggle { left: auto; right: 18px; }
[data-deck-nav="none"]  .deck-nav-toggle { display: none; }

/* --- Expanded panel ------------------------------------------- */
.deck-nav {
  position: fixed;
  bottom: 64px;
  left: 18px;
  z-index: 99;
  width: 380px;
  max-height: 65vh;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  font-family: var(--font-body);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: translateY(8px) scale(0.98);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease);
}
.deck-nav[data-open="true"] {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}
[data-deck-nav="right"] .deck-nav { left: auto; right: 18px; }
[data-deck-nav="none"]  .deck-nav { display: none; }

/* Tabs (Slides | Decks) */
.deck-nav-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--line);
  background: var(--card-soft);
}
.deck-nav-tab {
  appearance: none;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 12px 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  font: 600 12px/1 var(--font-body);
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease), background 0.15s var(--ease);
}
.deck-nav-tab:hover { color: var(--ink); background: rgba(255,255,255,0.6); }
.deck-nav-tab.is-active {
  color: var(--prutan-indigo-deep);
  border-bottom-color: var(--prutan-indigo);
  background: #ffffff;
}
.deck-nav-tab .tab-count {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  background: var(--line);
  padding: 2px 7px;
  border-radius: 9999px;
  min-width: 22px;
  text-align: center;
}
.deck-nav-tab.is-active .tab-count {
  background: var(--prutan-indigo-soft);
  color: var(--prutan-indigo-deep);
}

/* Panes */
.deck-nav-pane {
  display: none;
  flex: 1;
  overflow: hidden;
  flex-direction: column;
}
.deck-nav-pane.is-active {
  display: flex;
}

/* List */
.deck-nav-list {
  list-style: none;
  margin: 0;
  padding: 6px 0;
  overflow-y: auto;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}
.deck-nav-list::-webkit-scrollbar { width: 6px; }
.deck-nav-list::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 3px; }

/* Empty state */
.deck-nav-empty {
  padding: 18px 18px;
  font-size: 12.5px;
  color: var(--muted);
  text-align: center;
  list-style: none;
}

/* Items (used for both slides and decks panes) */
.deck-nav-item {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  padding: 9px 16px 9px 14px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background 0.12s var(--ease), border-color 0.12s var(--ease);
  position: relative;
  align-items: start;
}
.deck-nav-item:hover { background: var(--card-soft); }
.deck-nav-item:focus-visible { outline: 2px solid var(--prutan-indigo); outline-offset: -2px; }

.deck-nav-item .item-index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--faint);
  padding-top: 3px;
  font-weight: 500;
}
.deck-nav-item .item-text { min-width: 0; }
.deck-nav-item .item-eyebrow {
  display: block;
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--prutan-indigo);
  margin-bottom: 2px;
}
.deck-nav-item .item-title {
  font-size: 13.5px;
  color: var(--ink);
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.005em;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.deck-nav-item .item-sub {
  display: block;
  font-size: 11.5px;
  color: var(--muted);
  line-height: 1.4;
  margin-top: 3px;
}
.deck-nav-item .item-here {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 2px 6px;
  border-radius: 3px;
  background: var(--prutan-indigo-soft);
  color: var(--prutan-indigo-deep);
}
.deck-nav-item.is-current {
  background: var(--prutan-indigo-soft);
  border-left-color: var(--prutan-indigo);
}
.deck-nav-item.is-current .item-title { color: var(--prutan-indigo-deep); font-weight: 600; }
.deck-nav-item.is-current .item-index { color: var(--prutan-indigo); }
.deck-nav-item.is-deck.is-current { cursor: default; }
.deck-nav-item.is-deck.is-current:hover { background: var(--prutan-indigo-soft); }

/* Sub-slides (vertical) get indent */
.deck-nav-item.is-sub {
  grid-template-columns: 40px 1fr;
  padding-left: 18px;
}
.deck-nav-item.is-sub .item-index { padding-left: 12px; color: var(--faint); }
.deck-nav-item.is-sub .item-index::before {
  content: '↳ ';
  color: var(--line-strong);
}

@media (max-width: 720px) {
  .deck-nav { width: calc(100vw - 36px); }
}