/* Shared hub motion — CountUp, fade/reveal, list stagger, magnet,
 * opt-in kinetic text. Strength is the same on every hub. Overlays
 * still control glass density only. Respects prefers-reduced-motion.
 */

:root {
  --hub-motion-duration: 420ms;
  --hub-motion-count: 560ms;
  --hub-motion-stagger: 45ms;
  --hub-motion-lift: 8px;
  --hub-motion-magnet: 5px;
}

.hub-reveal {
  opacity: 0;
  transform: translateY(var(--hub-motion-lift));
  transition:
    opacity var(--hub-motion-duration) ease,
    transform var(--hub-motion-duration) ease;
  transition-delay: var(--hub-reveal-delay, 0ms);
}

.hub-reveal.is-in {
  opacity: 1;
  transform: none;
}

.hub-reveal--gate {
  transform: none;
  transition-duration: 280ms;
}

.hub-magnet {
  transition: translate 160ms ease;
}

.hub-count {
  position: relative;
  display: inline-block;
  font-variant-numeric: tabular-nums;
}

.hub-count.is-ticking > :not(.hub-count__fx) {
  color: transparent;
}

.hub-count__fx {
  display: none;
  position: absolute;
  left: 0;
  top: 0;
  color: var(--depth);
  font: inherit;
  font-variant-numeric: tabular-nums;
  pointer-events: none;
  white-space: nowrap;
}

.hub-count.is-ticking > .hub-count__fx {
  display: block;
}

.hub-list-item {
  animation: hub-list-in var(--hub-motion-duration) ease both;
  animation-delay: var(--hub-list-delay, 0ms);
}

@keyframes hub-list-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* Abrupt board / palette remounts — opt in via playHubRemount(el). */
@keyframes hub-remount-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.hub-remount-in {
  animation: hub-remount-in var(--hub-motion-duration) ease both;
}

/* Opt-in word/line/character reveal. Add .hub-kinetic to canvas titles.
 * Not for the rail. startHubMotion() wraps the text. */
.hub-kinetic {
  position: relative;
}

.hub-kinetic--lines {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hub-kinetic__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hub-kinetic__mask {
  display: inline-block;
  overflow: hidden;
  vertical-align: baseline;
  padding-bottom: 0.18em;
  margin-bottom: -0.18em;
}

.hub-kinetic__seg {
  display: inline-block;
  opacity: 0;
  transform: translateY(var(--hub-motion-lift));
  transition:
    opacity var(--hub-motion-duration) ease,
    transform var(--hub-motion-duration) ease;
  transition-delay: var(--hub-kinetic-delay, 0ms);
}

.hub-kinetic--down .hub-kinetic__seg {
  transform: translateY(calc(var(--hub-motion-lift) * -1));
}

.hub-kinetic--left .hub-kinetic__seg {
  transform: translateX(var(--hub-motion-lift));
}

.hub-kinetic--right .hub-kinetic__seg {
  transform: translateX(calc(var(--hub-motion-lift) * -1));
}

.hub-kinetic.is-in .hub-kinetic__seg {
  opacity: 1;
  transform: none;
}

/* Opt-in scroll-hide chrome. startHubMotion() watches [data-hub-scroll-hide].
 * Scroll down past the threshold hides; scroll up (or back near top) reveals.
 * In-flow: collapse so chat messages can grow. Overlay: slide away like a
 * sticky header. */
.hub-scroll-hide {
  display: grid;
  grid-template-rows: 1fr;
  min-width: 0;
  flex: 0 0 auto;
  opacity: 1;
  transition:
    grid-template-rows 300ms ease-in-out,
    opacity 300ms ease-in-out,
    transform 300ms ease-in-out;
}

.hub-scroll-hide__inner {
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
  overflow: visible;
}

.hub-scroll-hide.is-hidden {
  grid-template-rows: 0fr;
  opacity: 0;
  pointer-events: none;
}

.hub-scroll-hide.is-hidden .hub-scroll-hide__inner {
  overflow: hidden;
}

.hub-scroll-hide--overlay {
  display: block;
}

.hub-scroll-hide--overlay.is-hidden {
  /* Keep in-flow size so the thread/scrollbar does not bounce. */
  grid-template-rows: 1fr;
  transform: translateY(-100%);
}

/* MorphingDialog — micro card → expanded overlay. Spring lives in JS. */
.hub-morph-dialog {
  position: fixed;
  inset: 0;
  z-index: 45;
  display: grid;
  place-items: center;
  padding: var(--space-5);
  background: color-mix(in srgb, var(--depth) 35%, transparent);
  opacity: 0;
  transition: opacity var(--hub-motion-duration) ease;
}

.hub-morph-dialog.is-in {
  opacity: 1;
}

.hub-morph-dialog__frame {
  position: relative;
  width: min(100%, 32rem);
  max-height: calc(100vh - var(--space-8));
  max-height: calc(100dvh - var(--space-8));
  overflow: auto;
  /* Editors must be opaque — glass fill lets the page bleed through the form. */
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--elev-4);
  will-change: transform;
}

.hub-morph-dialog__close {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  z-index: 2;
}

.hub-morph-dialog__origin {
  visibility: hidden;
}

.hub-morph-dialog__animating {
  will-change: transform;
}

@media (prefers-reduced-motion: reduce) {
  .hub-reveal,
  .hub-magnet,
  .hub-list-item,
  .hub-remount-in,
  .hub-kinetic__seg,
  .hub-morph-dialog {
    animation: none;
    transition: none;
    transform: none;
    translate: none;
    opacity: 1;
  }

  .hub-scroll-hide {
    transition: none;
  }

  .hub-count.is-ticking > :not(.hub-count__fx) {
    color: inherit;
  }

  .hub-count__fx,
  .hub-count.is-ticking > .hub-count__fx {
    display: none;
  }
}