/* Ceritera V8.4 — Dual Reading Mode */

.reading-mode-switch {
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding: 3px;
  border: var(--border-hairline) solid var(--border-subtle);
  border-radius: var(--radius-xs);
  background: color-mix(in srgb, var(--surface-muted) 72%, var(--surface-paper));
}
.reading-mode-switch button {
  min-height: 34px;
  padding: 0 var(--space-3);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 0;
  border-radius: calc(var(--radius-xs) - 2px);
  background: transparent;
  color: var(--text-secondary);
  box-shadow: none;
  font: 700 var(--text-2xs)/1 var(--font-ui);
  letter-spacing: .04em;
  text-transform: uppercase;
}
.reading-mode-switch button.is-active {
  background: var(--surface-paper);
  color: var(--action-primary);
  box-shadow: var(--shadow-subtle);
}
.reading-mode-switch button:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}

.reader-position-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  margin: 14px 0 4px;
}
.reader-mode-label {
  justify-self: start;
  font: 700 var(--text-2xs)/1 var(--font-label);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--action-primary);
}
.reader-position-row .page-indicator {
  grid-column: 2;
  margin: 0;
}

/* Magazine mode keeps the Phase 3 fixed-height, horizontal column pager. */
.reading-mode-magazine .pager-viewport {
  overflow: hidden;
  overscroll-behavior: contain;
  touch-action: pan-y pinch-zoom;
}
.reading-mode-magazine .reader-content {
  max-width: none;
}

/* Scroll mode uses a contained vertical reading surface. Only the current
   chapter is mounted, avoiding a full-book DOM and keeping long books light. */
.reading-mode-scroll .pager-viewport {
  height: clamp(430px, calc(100dvh - 17.5rem), 860px);
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior-y: contain;
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
  touch-action: pan-y pinch-zoom;
  padding-inline: clamp(.25rem, 2vw, 1.25rem);
  border-block: var(--border-hairline) solid var(--border-subtle);
  background:
    linear-gradient(var(--surface-paper), var(--surface-paper)) padding-box,
    linear-gradient(180deg, color-mix(in srgb, var(--action-primary-soft) 38%, transparent), transparent 18%, transparent 82%, color-mix(in srgb, var(--action-primary-soft) 38%, transparent)) border-box;
}
.reading-mode-scroll .reader-content {
  width: min(100%, var(--reader-measure));
  min-height: 100%;
  height: auto !important;
  margin-inline: auto;
  padding: clamp(1.5rem, 4vw, 3.25rem) 0 clamp(4rem, 10vh, 7rem);
  columns: auto !important;
  column-count: 1 !important;
  column-gap: 0 !important;
  column-rule: 0 !important;
  transform: none !important;
  opacity: 1 !important;
  will-change: auto;
  transition: opacity var(--duration-fast) ease;
}
.reading-mode-scroll .reader-content p,
.reading-mode-scroll .reader-content h3,
.reading-mode-scroll .reader-content h4,
.reading-mode-scroll .reader-content ul,
.reading-mode-scroll .reader-content ol,
.reading-mode-scroll .reader-content blockquote {
  break-inside: auto;
}
.reading-mode-scroll .pull-quote {
  column-span: none;
  margin-block: 2rem;
}
.reading-mode-scroll .swipe-hint {
  letter-spacing: .08em;
}
.reading-mode-scroll .chapter-nav-buttons {
  margin-top: var(--space-4);
}

/* The mode switch remains available on editorial pages, but reading-only
   controls stay hidden until a chapter is opened. */
.magazine-toolbar:not(.is-reading) .reading-mode-switch {
  opacity: .82;
}

@media (max-width: 1020px) {
  .reading-mode-switch button span:last-child { display: none; }
  .reading-mode-switch button { min-width: 36px; padding-inline: 9px; }
}

@media (max-width: 680px) {
  .reading-mode-switch {
    order: -1;
    flex: 0 0 auto;
  }
  .reading-mode-switch button {
    min-width: 34px;
    min-height: 32px;
    padding-inline: 8px;
  }
  .reading-mode-scroll .pager-viewport {
    height: calc(100dvh - 14.25rem);
    min-height: 390px;
    margin-inline: calc(var(--gutter-mobile) * -.35);
    padding-inline: var(--space-4);
  }
  .reading-mode-scroll .reader-content {
    padding-top: var(--space-6);
    padding-bottom: 5rem;
  }
  .reader-position-row {
    grid-template-columns: auto 1fr;
    gap: var(--space-3);
  }
  .reader-position-row .page-indicator {
    grid-column: 2;
    justify-self: end;
    text-align: right;
  }
  .reader-mode-label { font-size: .6rem; }
}

@media (prefers-reduced-motion: reduce) {
  .reading-mode-scroll .pager-viewport { scroll-behavior: auto; }
  .reading-mode-switch button { transition: none; }
}