/*
 * gestures.css — pinch-to-size, swipe-to-turn, and the section dock.
 *
 * Data contract (set by reading-gestures.mjs + ebook-navigation.mjs). All
 * hot-path state is scoped to main.chapter or the cue elements, so a
 * gesture frame never invalidates styles outside the prose.
 *   main.chapter  --reader-scale, [data-reader-scale], [data-reading-gestures]
 *   main.chapter  [data-gesture=pinch|swipe], [data-swipe=prev|next]
 *   .swipe-cue    --cue-reveal (0…1, inline)
 *   html          [data-packing] (viewport-packing.mjs, on real page zoom only)
 *   .section-navigation  --dock-progress, [data-at-start], [data-at-end]
 *
 * Unlayered on purpose, like controls.css — these are leaf components that
 * must win over layered defaults without !important.
 */

:root {
  --swipe-cue-ink: color-mix(in srgb, var(--theme-accent-main) 78%, var(--theme-text-main) 22%);
  --swipe-cue-paper: color-mix(in srgb, var(--theme-paper, var(--color-bg-content)) 92%, #fff 8%);
  --gesture-gold: var(--color-gold, #c4922e);
}

/* ─── Touch surface ──────────────────────────────────────────────────
 * On touch devices the prose owns horizontal drags (swipe) and two-finger
 * pinches (text size). Vertical panning stays native. Scroll containers
 * inside the prose (code, Spw payloads) keep their own horizontal pan
 * because touch-action resolves against the nearest scroller. */
html[data-touch='true'] main.chapter[data-reading-gestures='on'] {
  touch-action: pan-y;
}

html[data-touch='true'] main.chapter[data-reading-gestures='on'] :is(pre, .motif-spw, [data-spw-component] pre) {
  touch-action: pan-x pan-y;
}

/* Live pinch: drop transitions so the reflow tracks the fingers. */
main.chapter[data-gesture='pinch'],
main.chapter[data-gesture='pinch'] * {
  transition: none !important;
}

main.chapter[data-gesture='swipe'] {
  user-select: none;
  -webkit-user-select: none;
}

/* The active section leans with the drag (inline transform from the
 * module — a page that's about to turn); it eases back on release via the
 * section's own transform transition in sections.css. */
main.chapter[data-swipe] > [data-ebook-section='true'][data-swipe-lean] {
  transition: transform 40ms linear;
}

/* ─── Swipe cues ───────────────────────────────────────────────────────
 * A vertical tab on the edge you're pulling from. It names the section
 * (or chapter) you'll land on, fills as the drag nears the threshold, and
 * flashes gold on commit. */
.swipe-cue {
  --cue-reveal: 0;
  position: fixed;
  top: 50%;
  z-index: 34;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 0.5rem;
  align-items: center;
  max-width: min(58vw, 18rem);
  padding: 0.55rem 0.8rem;
  border: 1px solid color-mix(in srgb, var(--swipe-cue-ink) 34%, transparent);
  background:
    linear-gradient(180deg, color-mix(in srgb, #fff 42%, transparent), transparent 60%),
    var(--swipe-cue-paper);
  color: var(--swipe-cue-ink);
  box-shadow:
    0 12px 30px color-mix(in srgb, var(--theme-accent-main) 16%, transparent),
    inset 0 1px 0 color-mix(in srgb, #fff 55%, transparent);
  pointer-events: none;
  opacity: 0;
  transform: translateY(-50%) translateX(var(--cue-offset, 0px));
  transition:
    opacity 160ms ease,
    transform 200ms cubic-bezier(0.2, 0.8, 0.2, 1),
    box-shadow 200ms ease,
    display 200ms allow-discrete;
  will-change: transform, opacity;
}

/* At rest the cue is parked a full width past the viewport edge, and a
   fixed box out there still counts as scrollable overflow: the page
   gained ~35px of sideways scroll. Take it out of layout while idle;
   allow-discrete keeps the fade-out, @starting-style the fade-in. */
.swipe-cue:not([data-state]),
.swipe-cue[data-state='idle'] {
  display: none;
}

@starting-style {
  .swipe-cue {
    opacity: 0;
  }
}

.swipe-cue::after {
  content: '';
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--theme-accent-main), var(--gesture-gold));
  transform-origin: left center;
  transform: scaleX(var(--cue-reveal));
  transition: transform 60ms linear;
}

.swipe-cue[data-edge='next'] {
  right: 0;
  border-right: 0;
  border-radius: var(--border-radius-pill) 0 0 var(--border-radius-pill);
  --cue-offset: calc(100% - var(--cue-reveal) * 100%);
}

.swipe-cue[data-edge='prev'] {
  left: 0;
  border-left: 0;
  border-radius: 0 var(--border-radius-pill) var(--border-radius-pill) 0;
  --cue-offset: calc(-100% + var(--cue-reveal) * 100%);
  grid-template-columns: auto minmax(0, 1fr);
}

.swipe-cue[data-edge='next']::after {
  transform-origin: right center;
}

.swipe-cue-glyph {
  grid-row: 1 / span 2;
  font-family: var(--font-family-heading);
  font-size: 1.9rem;
  line-height: 1;
  color: var(--gesture-gold);
}

.swipe-cue[data-edge='prev'] .swipe-cue-glyph {
  grid-column: 1;
}

.swipe-cue[data-edge='next'] .swipe-cue-glyph {
  grid-column: 2;
  grid-row: 1 / span 2;
}

.swipe-cue[data-edge='next'] .swipe-cue-kicker,
.swipe-cue[data-edge='next'] .swipe-cue-label {
  grid-column: 1;
  text-align: right;
}

.swipe-cue-kicker {
  font-family: 'LoreLand', var(--font-family-heading);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--swipe-cue-ink) 70%, var(--color-text-alt));
  white-space: nowrap;
}

.swipe-cue-label {
  font-family: var(--font-family-heading);
  font-size: 0.92rem;
  line-height: 1.2;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* dragging: --cue-reveal is written inline by the module as the finger moves. */
.swipe-cue[data-state='dragging'],
.swipe-cue[data-state='ready'] {
  opacity: 1;
}

.swipe-cue[data-state='ready'] {
  border-color: color-mix(in srgb, var(--gesture-gold) 70%, transparent);
  box-shadow:
    0 12px 30px color-mix(in srgb, var(--gesture-gold) 22%, transparent),
    0 0 0 3px color-mix(in srgb, var(--gesture-gold) 22%, transparent),
    inset 0 1px 0 color-mix(in srgb, #fff 55%, transparent);
}

.swipe-cue[data-state='ready'] .swipe-cue-glyph {
  color: var(--color-hearth, #b0602a);
}

/* commit / armed: hold fully revealed without a drag. */
.swipe-cue[data-state='commit'],
.swipe-cue[data-state='armed'],
.swipe-cue[data-state='blocked'] {
  --cue-reveal: 1;
  opacity: 1;
}

.swipe-cue[data-state='commit'] {
  border-color: var(--gesture-gold);
  color: var(--color-gold-ink, #6b5010);
}

.swipe-cue[data-state='commit']::after {
  background: var(--gesture-gold);
}

.swipe-cue[data-state='armed'] {
  animation: swipe-cue-pulse 900ms ease-in-out infinite alternate;
}

.swipe-cue[data-state='blocked'] {
  opacity: 0.5;
}

@keyframes swipe-cue-pulse {
  from {
    box-shadow:
      0 12px 30px color-mix(in srgb, var(--gesture-gold) 12%, transparent),
      inset 0 1px 0 color-mix(in srgb, #fff 55%, transparent);
  }

  to {
    box-shadow:
      0 12px 30px color-mix(in srgb, var(--gesture-gold) 34%, transparent),
      0 0 0 4px color-mix(in srgb, var(--gesture-gold) 20%, transparent),
      inset 0 1px 0 color-mix(in srgb, #fff 55%, transparent);
  }
}

/* ─── First-run hint ─────────────────────────────────────────────────── */
.gesture-hint {
  position: fixed;
  left: 50%;
  bottom: calc(4.4rem + env(safe-area-inset-bottom, 0px));
  z-index: 35;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  column-gap: 0.6rem;
  row-gap: 0.15rem;
  width: min(92vw, 24rem);
  padding: 0.62rem 0.55rem 0.62rem 0.9rem;
  border: 1px solid color-mix(in srgb, var(--theme-accent-main) 30%, var(--border-color-main));
  border-radius: var(--border-radius-main);
  background:
    linear-gradient(180deg, color-mix(in srgb, #fff 36%, transparent), transparent 55%),
    var(--swipe-cue-paper);
  color: var(--theme-text-main);
  box-shadow:
    0 14px 34px color-mix(in srgb, var(--theme-accent-main) 18%, transparent),
    inset 0 1px 0 color-mix(in srgb, #fff 55%, transparent);
  font-family: var(--font-family-heading);
  font-size: 0.86rem;
  line-height: 1.35;
  opacity: 0;
  transform: translate(-50%, 8px);
  transition:
    opacity 220ms ease,
    transform 260ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.gesture-hint[data-state='shown'] {
  opacity: 1;
  transform: translate(-50%, 0);
}

.gesture-hint[data-state='leaving'] {
  opacity: 0;
  transform: translate(-50%, 6px);
}

.gesture-hint-line {
  grid-column: 1;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.gesture-hint-glyph {
  flex: 0 0 2.1rem;
  color: var(--gesture-gold);
  font-size: 1rem;
  letter-spacing: 0.05em;
}

.gesture-hint-close {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  min-width: 2.2rem;
  min-height: 2.2rem;
  border: 1px solid color-mix(in srgb, var(--border-color-main) 80%, transparent);
  border-radius: var(--border-radius-pill);
  background: transparent;
  color: var(--color-text-alt);
  font-size: 1.1rem;
  line-height: 1;
}

/* ─── Section dock ──────────────────────────────────────────────────────
 * The bottom pill gets a live position readout and a hairline progress
 * seam, so the dock says where you are, not only where you can go. */
.section-navigation-position {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 4.6rem;
  min-height: var(--spw-control-height, 2rem);
  padding: 0.1rem 0.55rem;
  font-family: "JetBrainsMono", "IBM Plex Mono", "Fira Code", var(--font-family-mono, monospace);
  font-size: 0.74rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: color-mix(in srgb, var(--theme-accent-main) 70%, var(--color-text-alt));
  white-space: nowrap;
}

.section-navigation--enhanced {
  position: sticky;
  overflow: hidden;
  isolation: isolate;
}

.section-navigation--enhanced::after {
  content: '';
  position: absolute;
  left: 0.65rem;
  right: 0.65rem;
  bottom: 0;
  height: 2px;
  border-radius: var(--border-radius-pill);
  background: color-mix(in srgb, var(--theme-accent-main) 14%, transparent);
  pointer-events: none;
}

.section-navigation--enhanced::before {
  content: '';
  position: absolute;
  left: 0.65rem;
  bottom: 0;
  z-index: 1;
  width: calc(100% - 1.3rem);
  height: 2px;
  border-radius: var(--border-radius-pill);
  background: linear-gradient(90deg, var(--theme-accent-main), var(--gesture-gold));
  transform-origin: left center;
  transform: scaleX(var(--dock-progress, 0));
  transition: transform 320ms cubic-bezier(0.2, 0.8, 0.2, 1);
  pointer-events: none;
}

.section-navigation[data-at-end='true'] .next-section,
.section-navigation[data-at-end='true'] .next {
  border-color: color-mix(in srgb, var(--gesture-gold) 55%, var(--border-color-main));
}

/* ─── Text size panel ───────────────────────────────────────────────── */
.reader-scale-controls {
  display: grid;
  gap: 0.42rem;
  border: var(--interactive-border);
  border-radius: var(--border-radius-small);
  background: var(--theme-paper);
  padding: 0.7rem;
}

.reader-scale-controls h2 {
  font-size: 0.95rem;
  margin: 0;
}

.reader-scale-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.reader-scale-button,
.reader-scale-reset {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--spw-control-height, 2rem);
  min-width: 2.6rem;
  border: var(--interactive-border);
  border-radius: var(--border-radius-pill);
  background: color-mix(in srgb, var(--spw-panel-surface-strong, #fff) 82%, transparent 18%);
  color: var(--theme-accent-alt);
  font-family: var(--font-family-heading);
  font-size: 0.92rem;
  line-height: 1;
  padding: 0.22rem 0.6rem;
  transition: var(--interactive-transition);
}

.reader-scale-button sup {
  font-size: 0.6em;
  margin-left: 0.08em;
  color: var(--gesture-gold);
}

.reader-scale-button:disabled {
  opacity: 0.45;
}

.reader-scale-button:not(:disabled):hover,
.reader-scale-button:focus-visible,
.reader-scale-reset:hover,
.reader-scale-reset:focus-visible {
  background: var(--interactive-bg-hover);
  outline: 2px solid var(--interactive-outline);
  outline-offset: 2px;
}

.reader-scale-reset {
  min-width: 0;
  font-family: "JetBrainsMono", "IBM Plex Mono", "Fira Code", var(--font-family-mono, monospace);
  font-size: 0.7rem;
  color: var(--color-text-alt);
}

.reader-scale-readout {
  flex: 1 1 auto;
  min-width: 3.4rem;
  text-align: center;
  font-family: "JetBrainsMono", "IBM Plex Mono", "Fira Code", var(--font-family-mono, monospace);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
  color: color-mix(in srgb, var(--theme-accent-main) 70%, var(--color-text-alt));
}

.reader-scale-guide {
  margin: 0;
  color: var(--color-text-alt);
  font-size: 0.8rem;
}

/* Bigger prose, calmer chrome: at huge scale the aside chips wrap more
 * freely and the dock buttons stop competing with the readout. */
main.chapter[data-reader-scale='huge'] ~ .section-navigation button {
  font-size: 0.78rem;
}

/* ─── Pinch packing (page-level zoom that started off the prose) ────── */
html[data-packing='compact'] aside .additional-links,
html[data-packing='compact'] .chapter-navigation {
  flex-wrap: wrap;
}

html[data-packing='compact'] .lifecycle-breadcrumb,
html[data-packing='compact'] .swipe-cue,
html[data-packing='compact'] .gesture-hint {
  display: none;
}

/* ─── Coarse pointers: 44px targets on the docks ─────────────────────── */
@media (pointer: coarse) {
  .section-navigation button,
  .chapter-navigation button,
  .chapter-navigation .hub-home,
  .reader-scale-button,
  .reader-scale-reset {
    min-height: 44px;
  }
}

/* ─── Reduced motion: cues fade, nothing slides or pulses ─────────────── */
@media (prefers-reduced-motion: reduce) {
  .swipe-cue {
    transition: opacity 120ms ease, display 120ms allow-discrete;
    transform: translateY(-50%);
  }

  .gesture-hint {
    transition: opacity 120ms ease;
    transform: translate(-50%, 0);
  }

  .section-navigation--enhanced::before,
  .swipe-cue::after {
    transition: none;
  }

  .swipe-cue[data-state='armed'] {
    animation: none;
  }

  main.chapter[data-swipe] > [data-ebook-section='true'][data-swipe-lean] {
    transition: none;
  }
}

@media print {
  .swipe-cue,
  .gesture-hint,
  .reader-scale-controls,
  .section-navigation-position {
    display: none !important;
  }
}