/* ===================================================================
   Slide presentation layer · paginates each module
   Each <section> inside .wrap becomes a slide.
   =================================================================== */

/* When pagination is active, hide all sections except .slide-active */
body.paginated .wrap > section { display: none; }
body.paginated .wrap > section.slide-active {
  display: block;
  animation: slideFadeIn 0.35s ease;
}

@keyframes slideFadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Bottom nav bar */
#slide-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 254, 251, 0.97);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--rule);
  box-shadow: 0 -2px 14px rgba(0,0,0,.04);
  padding: 14px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  z-index: 1000;
  font-family: var(--sans);
}

#slide-nav button {
  background: var(--accent);
  color: white;
  border: 0;
  padding: 10px 22px;
  border-radius: 6px;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, transform .08s;
  min-width: 110px;
}
#slide-nav button:hover:not(:disabled) {
  background: var(--accent-strong);
}
#slide-nav button:active:not(:disabled) {
  transform: scale(0.96);
}
#slide-nav button:disabled {
  background: var(--rule);
  color: var(--dim);
  cursor: not-allowed;
}

#slide-dots {
  display: flex;
  gap: 6px;
  align-items: center;
  flex: 1;
  justify-content: center;
  flex-wrap: wrap;
}
#slide-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--rule-strong);
  cursor: pointer;
  transition: background .2s, transform .15s;
}
#slide-dots .dot:hover {
  background: var(--accent-soft);
  transform: scale(1.25);
}
#slide-dots .dot.active {
  background: var(--accent);
  transform: scale(1.3);
}

#slide-counter {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  margin: 0 6px;
  white-space: nowrap;
}

/* Top progress bar */
#slide-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--rule);
  z-index: 1001;
}
#slide-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  width: 0;
  transition: width .35s ease;
}

/* Slide title overlay (top-left under progress bar) */
#slide-title-overlay {
  position: fixed;
  top: 14px;
  right: 24px;
  background: var(--accent);
  color: white;
  padding: 6px 14px;
  border-radius: 99px;
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  z-index: 1001;
  box-shadow: 0 2px 8px rgba(42, 111, 95, 0.25);
}

/* Hide top hero when paginated (so the slide title shows fully) */
body.paginated header.hero {
  padding: 22px 24px 16px;
}
body.paginated header.hero h1 {
  font-size: 26px;
}
body.paginated header.hero .sub {
  font-size: 14px;
}

/* Slide-specific spacing so content doesn't overlap the bottom nav */
body.paginated {
  padding-bottom: 90px;
}

/* Per-slide badge (the small label like "Slide 3 · Theory") */
.slide-badge {
  display: inline-block;
  background: var(--gold-soft);
  color: var(--gold);
  padding: 4px 12px;
  border-radius: 99px;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

/* Keyboard hint */
#slide-hint {
  position: fixed;
  bottom: 78px;
  right: 24px;
  background: rgba(26, 26, 26, 0.78);
  color: white;
  padding: 6px 12px;
  border-radius: 6px;
  font-family: var(--sans);
  font-size: 11px;
  z-index: 1000;
  opacity: 0;
  transition: opacity .5s;
  pointer-events: none;
}
#slide-hint.show { opacity: 1; }

/* Make widgets feel more presentation-like (slight enlargement of svg, more breathing room) */
body.paginated .widget {
  margin: 22px auto;
  max-width: 900px;
  box-shadow: 0 4px 24px rgba(0,0,0,.04);
}

/* On smaller screens, stack the nav buttons */
@media (max-width: 600px) {
  #slide-nav { flex-direction: column; gap: 8px; padding: 10px 16px; }
  #slide-nav button { width: 100%; }
  #slide-dots { order: -1; }
}