.folder-float {
  --ff-w: 200px;
  --ff-h: 148px;
  --ff-r: 14px;
  --ff-tab: 14px;
  --ff-back: #3f3f46;
  --ff-front: #52525b;
  --ff-paper: #f5f5f5;
  --ff-item: #f5f5f5;
  --ff-item-ink: #18181b;
  --ff-label: #f5f5f5;
  --ff-spread: 180px;
  --ff-lift: 26px;
  --ff-angle: 34deg;
  --ff-rest: 16deg;
  --ff-open: 520ms;
  --ff-close: 312ms;
  --ff-stagger: 45ms;
  --ff-n: 6;
  --ff-spring: cubic-bezier(0.34, 1.57, 0.64, 1);
  --ff-ease-out: cubic-bezier(0.23, 1, 0.32, 1);

  position: relative;
  display: inline-block;
  width: var(--ff-w);
  padding-top: var(--ff-tab);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
}

.folder-float__folder {
  position: relative;
  width: var(--ff-w);
  height: var(--ff-h);
}

.folder-float__back {
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: var(--ff-r);
  background: var(--ff-back);
  transform: perspective(600px) rotateX(8deg);
  transform-origin: 50% 100%;
}

.folder-float__back::before {
  content: '';
  position: absolute;
  top: calc(-1 * var(--ff-tab));
  left: 0;
  width: 42%;
  height: calc(var(--ff-tab) + var(--ff-r));
  border-radius: var(--ff-r) var(--ff-r) 0 0;
  background: inherit;
}

.folder-float__paper {
  position: absolute;
  top: 10%;
  z-index: 1;
  right: 8%;
  left: 8%;
  height: 50%;
  border-radius: 6px;
  background: var(--ff-paper);
  opacity: 0;
  transform: translateY(10px);
  transition:
    transform var(--ff-close) var(--ff-ease-out),
    opacity var(--ff-close) ease;
}

.folder-float__front {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 5px;
  height: 76%;
  padding: 14px 16px;
  box-sizing: border-box;
  border-radius: var(--ff-r);
  background: linear-gradient(180deg, color-mix(in srgb, var(--ff-front) 92%, #fff), var(--ff-front) 60%);
  color: var(--ff-label);
  box-shadow: 0 -10px 24px rgba(0, 0, 0, 0.28);
  transform: perspective(600px) rotateX(calc(-1 * var(--ff-rest)));
  transform-origin: 50% 100%;
  transition: transform var(--ff-open) var(--ff-ease-out);
}

.folder-float__label {
  font-size: 13px;
  font-weight: 500;
}

.folder-float__sub {
  font-size: 11px;
  opacity: 0.55;
}

.folder-float__trigger {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 3;
  height: 76%;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: var(--ff-r);
  background: transparent;
  cursor: pointer;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

.folder-float[data-open] .folder-float__front {
  transform: perspective(600px) rotateX(calc(-1 * var(--ff-angle)));
}

.folder-float[data-open] .folder-float__paper {
  opacity: 1;
  transform: translateY(0);
  transition:
    transform var(--ff-open) var(--ff-ease-out),
    opacity 200ms ease;
}

.folder-float__items {
  position: absolute;
  top: var(--ff-tab);
  left: 50%;
  z-index: 1;
  width: 0;
  height: 0;
}

.folder-float[data-open] .folder-float__items::before {
  content: '';
  position: absolute;
  top: calc(-1 * (var(--ff-lift) + 120px));
  left: calc(-1 * (var(--ff-spread) + 100px));
  width: calc(2 * var(--ff-spread) + 200px);
  height: calc(var(--ff-lift) + 120px);
}

.folder-float__item {
  position: absolute;
  top: 0;
  left: 50%;
  margin: 0;
  padding: 0 14px;
  height: 34px;
  border: 0;
  border-radius: 17px;
  background: var(--ff-item);
  color: var(--ff-item-ink);
  font: inherit;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.14);
  cursor: pointer;
  outline: none;
  opacity: 0;
  transform: translate(-50%, 44px) scale(0.6);
  transform-origin: 50% 50%;
  pointer-events: none;
  -webkit-tap-highlight-color: transparent;
  transition:
    transform var(--ff-close) var(--ff-ease-out) calc((var(--ff-n) - 1 - var(--i)) * var(--ff-stagger) * 0.5),
    opacity 160ms ease calc((var(--ff-n) - 1 - var(--i)) * var(--ff-stagger) * 0.5 + var(--ff-close) * 0.45),
    scale 160ms var(--ff-ease-out);
}

.folder-float[data-open] .folder-float__item {
  opacity: 1;
  transform: translate(calc(-50% + var(--x)), var(--y)) rotate(var(--r)) scale(1);
  pointer-events: auto;
  transition:
    transform var(--ff-open) var(--ff-spring) calc(var(--i) * var(--ff-stagger)),
    opacity 160ms ease calc(var(--i) * var(--ff-stagger)),
    scale 160ms var(--ff-ease-out);
}

.folder-float[data-live] .folder-float__item {
  cursor: grab;
  transition: scale 160ms var(--ff-ease-out);
}

.folder-float__item[data-drag] {
  cursor: grabbing;
}

@media (hover: hover) and (pointer: fine) {
  .folder-float[data-open] .folder-float__item:hover {
    scale: 1.05;
  }
}

.folder-float[data-open] .folder-float__item:active {
  scale: 0.97;
}

.folder-float__item[data-pop] {
  animation: folder-float-pop 320ms var(--ff-ease-out);
}

.folder-float__drift {
  display: block;
  animation: folder-float-drift 3.2s ease-in-out infinite;
  animation-delay: calc(var(--i) * -0.7s);
  animation-play-state: paused;
}

.folder-float[data-open] .folder-float__drift {
  animation-play-state: running;
}

.folder-float[data-physics] .folder-float__drift,
.folder-float[data-live] .folder-float__drift {
  animation: none;
}

@keyframes folder-float-drift {
  0%,
  100% {
    translate: 0 0;
  }

  50% {
    translate: 0 -3px;
  }
}

@keyframes folder-float-pop {
  30% {
    scale: 1.1;
  }

  100% {
    scale: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .folder-float__front,
  .folder-float__paper {
    transition: opacity 200ms ease;
  }

  .folder-float[data-open] .folder-float__front {
    transform: perspective(600px) rotateX(calc(-1 * var(--ff-rest)));
  }

  .folder-float__paper {
    transform: none !important;
  }

  .folder-float__item {
    transition: opacity 200ms ease;
  }

  .folder-float[data-open] .folder-float__item {
    transition: opacity 200ms ease calc(var(--i) * var(--ff-stagger));
  }

  .folder-float__drift {
    animation: none;
  }
}


/* Cordastra integration: contained clouds, responsive stages, visible focus. */
.research-folders { scroll-margin-top: 88px; padding: 76px 0 64px; background: linear-gradient(120deg, var(--blue-50), var(--yellow-50)); border-bottom: 1px solid var(--border); }
.research-folders[hidden] { display: none; }
.research-folders__intro { display: flex; justify-content: space-between; align-items: end; gap: 24px; }
.research-folders__hint { color: var(--muted); max-width: 310px; font-size: 14px; }
.research-folders__grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; margin-top: 32px; }
.folder-float {
  --ff-back: var(--blue-800);
  --ff-front: var(--blue-600);
  --ff-paper: var(--yellow-100);
  --ff-item: var(--blue-100);
  --ff-item-ink: var(--blue-900);
  --ff-label: #fff;
  --ff-n: 4;
  display: block;
  width: 100%;
  padding: var(--cloud-height, 170px) 0 28px;
  border: 1px solid var(--blue-200);
  border-radius: 20px;
  background: linear-gradient(155deg, #fff, var(--blue-100));
  isolation: isolate;
}
.folder-float--yellow { --ff-back: var(--yellow-600); --ff-front: var(--yellow-400); --ff-paper: var(--blue-100); --ff-item: var(--yellow-100); --ff-label: var(--blue-950); border-color: var(--yellow-200); background: linear-gradient(155deg, #fff, var(--yellow-100)); }
.folder-float--navy { --ff-back: var(--blue-950); --ff-front: var(--blue-700); --ff-item: var(--yellow-100); }
.folder-float__folder { margin: 0 auto; }
.folder-float__items { top: var(--cloud-height, 170px); z-index: 4; }
.folder-float[data-open] .folder-float__items::before { display: none; }
.folder-float__item { width: max-content; height: 40px; font-size: 12px; max-width: var(--pill-max, 260px); white-space: normal; line-height: 1.2; }
.folder-float__item:nth-child(even) { background: var(--yellow-100); }
.folder-float--yellow .folder-float__item:nth-child(even), .folder-float--navy .folder-float__item:nth-child(even) { background: var(--blue-100); }
.folder-float__label { font-size: 15px; font-weight: 600; line-height: 1.3; }
.folder-float__sub { font-size: 12px; opacity: 1; line-height: 1.4; }
.folder-float__front { box-shadow: 0 -8px 20px rgba(13, 31, 56, 0.17); }
.folder-float__trigger { height: 100%; }
.folder-float__trigger:focus-visible, .folder-float__item:focus-visible { outline: 3px solid var(--blue-600); outline-offset: 5px; }
.folder-float__item[data-drag] { z-index: 2; }
.folder-float[data-live] .folder-float__item { touch-action: none; }
@media (max-width: 940px) {
  .research-folders__grid { grid-template-columns: 1fr; max-width: 560px; margin-inline: auto; }
  .research-folders__intro { display: block; }
  .research-folders__hint { margin-top: 18px; max-width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  .folder-float *, .folder-float[data-open] .folder-float__item { animation: none !important; transition: none !important; }
  .folder-float[data-open] .folder-float__item { transform: translate(calc(-50% + var(--x)), var(--y)); }
}