/* ==========================================================================
   Features — horizontal carousel of auto-playing video slides (js/features.js).
   No visible controls: clicking the active slide advances to the next one.

   Layout variables
     --frame          height of the carousel viewport
     --slide          width of one slide
     --slide-max      upper limit for --slide on large screens (desktop only)
     --gap            gap between slides
     --feature-grow   0..1, slides grow slightly as the section scrolls into view
     --i / --drag     active index and live drag offset, set by JS
   The track only ever moves with a transform (mouse drag / wheel on desktop,
   horizontal touch swipes on phones). Everything in the carousel has
   touch-action: pan-y, so vertical swipes on it scroll the page natively.
   ========================================================================== */
.home-feature {
  --feature-grow: 0;
  --frame: 88svh;
  --slide: calc((.7 + var(--feature-grow) * .12) * 100svw);
  --gap: .85rem;
  background: transparent;
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  min-height: 0;
  opacity: 0;                         /* fades in once the statement above has settled */
  overflow: visible;
  pointer-events: none;
  position: relative;
  transition: opacity .7s var(--home-ease);
  z-index: 3;
}

.home-feature--in {
  opacity: 1;
  pointer-events: auto;
}

.home-feature__viewport {
  container-type: inline-size;
  cursor: grab;
  height: var(--frame);
  max-height: var(--frame);
  overflow: hidden;
  position: relative;
  touch-action: pan-y;
  user-select: none;
  -webkit-user-select: none;
  width: 100%;
}

.home-feature__viewport:active {
  cursor: grabbing;
}

.home-feature__scroller {
  height: 100%;
  overflow: hidden;
}

.home-feature__track {
  --i: 0;
  --drag: 0px;
  display: flex;
  gap: var(--gap);
  height: 100%;
  padding-inline: calc((100cqi - var(--slide)) / 2);
  touch-action: pan-y;
  transform: translate3d(calc(var(--drag) - var(--i) * (var(--slide) + var(--gap))), 0, 0);
  will-change: transform;
}

/* --------------------------------------------------------------------------
   Slide
   -------------------------------------------------------------------------- */
.home-feature__slide {
  background: #000;
  border-radius: 20px;
  cursor: pointer;
  flex: 0 0 var(--slide);
  height: 100%;
  overflow: hidden;
  position: relative;
  touch-action: pan-y;
  width: var(--slide);
  z-index: 1;
}

.home-feature__slide--on {
  z-index: 2;
}

.home-feature__slide--lifted {
  z-index: 4;
}

.home-feature__still,
.home-feature__video {
  display: block;
  height: 100%;
  inset: 0;
  object-fit: cover;
  object-position: center;
  pointer-events: none;
  position: absolute;
  width: 100%;
}

.home-feature__still {
  z-index: 0;
}

.home-feature__video {
  opacity: 0;
  z-index: 1;
}

.home-feature__video--live {
  opacity: 1;
}

.home-feature__slide:has(.home-feature__video--live) .home-feature__still {
  visibility: hidden;
}

/* shading so the copy stays readable: a soft dark corner behind the heading
   (top-left), plus light bands along the top and bottom edges */
.home-feature__slide::after {
  background:
    radial-gradient(ellipse 95% 80% at 0 0, rgba(0, 0, 0, .5), rgba(0, 0, 0, .26) 40%, transparent 100%),
    linear-gradient(180deg, rgba(0, 0, 0, .22), transparent 22%),
    linear-gradient(180deg, transparent 76%, rgba(0, 0, 0, .26));
  content: "";
  inset: 0;
  pointer-events: none;
  position: absolute;
  z-index: 1;
}

/* Copy: heading top-left, description bottom-left */
.home-feature__copy {
  align-items: stretch;
  display: flex;
  flex-direction: column;
  gap: .65rem;
  inset: 0;
  justify-content: space-between;
  padding: 1.35rem 1.25rem;
  pointer-events: none;
  position: absolute;
  z-index: 2;
}

/* copy is hidden until the slide becomes active (js toggles the two classes) */
.home-feature__slide:not(.home-feature__slide--copy-held):not(.home-feature__slide--copy-revealing) .home-feature__copy {
  opacity: 0;
  visibility: hidden;
}

.home-feature__slide--copy-held .home-heading-char {
  filter: none !important;
  opacity: 1 !important;
}

.home-feature__heading,
.home-feature__body {
  align-self: flex-start;
  margin: 0;
  text-align: left;
}

.home-feature__heading {
  font-size: 28px;
  line-height: 34px;
  max-width: 18em;
  text-shadow: 0 1px 18px rgba(0, 0, 0, .45);
}

.home-feature__heading .home-heading-word--css-glass + .home-heading-word:has(> .home-heading-char:only-child) {
  margin-left: -.1em;
}

.home-feature__body {
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  line-height: 22px;
  max-width: 36rem;
  text-shadow: 0 1px 16px rgba(0, 0, 0, .55);
}

/* words of the description are revealed line by line */
.home-feature__word {
  display: inline-block;
  filter: blur(8px);
  opacity: 0;
}

/* --------------------------------------------------------------------------
   Desktop
   -------------------------------------------------------------------------- */
@media (min-width: 768px) {
  .home-feature {
    --frame: calc(76svh - 2.5rem);
    --slide-max: 40rem;                         /* slides never get wider than this (large screens) */
    --slide: min(46svw, var(--slide-max));
    --gap: 1.15rem;
  }

  /* the carousel is as tall as a 16:9 slide */
  .home-feature__viewport {
    height: min(var(--frame), calc(var(--slide) * 9 / 16));
  }

  .home-feature__slide {
    border-radius: 28px;
  }

  .home-feature__copy {
    gap: 2rem;
    padding: 1.5rem 1.75rem 1.9rem;
  }

  .home-feature__heading {
    font-size: 42px;
    line-height: 48px;
    max-width: none;
  }

  .home-feature__heading .home-h2-accent {
    font-size: 44px;
    line-height: 48px;
  }

  .home-feature__body {
    font-size: 17px;
    line-height: 25px;
    max-width: 24rem;
  }
}

/* --------------------------------------------------------------------------
   Phones: the same transform track, moved by horizontal swipes (js). The frame
   is tall, so it is not a scroll container of its own: a vertical swipe that
   starts on it scrolls the page like anywhere else. Copy fades in per slide.
   -------------------------------------------------------------------------- */
@media (max-width: 767px) {
  .home-feature {
    --frame: calc(var(--home-vh, 100lvh) * .62);
    --slide: 74svw;
    opacity: 1;
    transition: none;
  }

  .home-feature:not(.home-feature--in) {
    pointer-events: none;
  }

  .home-feature__track {
    will-change: auto;                 /* promoted only while it moves (GPU memory on phones) */
  }

  .home-feature__viewport,
  .home-feature__slide {
    max-height: var(--frame);
  }

  .home-feature__slide,
  .home-feature__slide::after {
    backface-visibility: hidden;
    transform: translateZ(0);
  }

  .home-feature__slide::after {
    background:
      radial-gradient(ellipse 95% 70% at 0 0, rgba(0, 0, 0, .4), rgba(0, 0, 0, .18) 40%, transparent 100%),
      linear-gradient(180deg, rgba(0, 0, 0, .38), rgba(0, 0, 0, .16) 30%, transparent 50%),
      linear-gradient(180deg, transparent 76%, rgba(0, 0, 0, .26));
  }

  .home-feature__viewport {
    opacity: 0;
    transform: translate3d(0, 1.75rem, 0);
    transition: opacity 1.05s var(--home-ease), transform 1.05s var(--home-ease);
  }

  .home-feature--in .home-feature__viewport {
    opacity: 1;
    transform: none;
  }

  .home-feature__copy {
    justify-content: flex-start;
    padding: 1.35rem 1.25rem 1.6rem;
  }

  .home-feature__heading {
    font-size: clamp(30px, 8.4vw, 34px);
    line-height: 1.12;
  }

  .home-feature__word {
    filter: none;
    opacity: 1;
    transform: none;
  }

  .home-feature__body {
    filter: blur(6px);
    font-size: 17px;
    letter-spacing: -.015em;
    line-height: 24px;
    margin-top: auto;
    max-width: 28em;
    opacity: 0;
    text-shadow: 0 0 1px rgba(0, 0, 0, .8), 0 2px 18px rgba(0, 0, 0, .7);
    transform: translate3d(0, .55rem, 0);
    transition: opacity 1.05s var(--home-ease), filter 1.05s var(--home-ease), transform 1.2s var(--home-ease);
  }

  .home-feature__copy--in .home-feature__body {
    filter: blur(0);
    opacity: 1;
    transform: none;
  }

  .home-feature__copy--snap .home-feature__body {
    transition: none;
  }

  /* taller phones get a bit more room */
  @media (min-height: 740px), (min-width: 390px) {
    .home-feature {
      margin-top: -2.25rem;
    }

    .home-feature__copy {
      padding-left: 1.45rem;
      padding-top: 1.7rem;
    }
  }

  @media (min-height: 900px), (min-width: 428px) {
    .home-feature {
      margin-top: -2.75rem;
    }

    .home-feature__copy {
      padding-left: 1.55rem;
      padding-top: 2rem;
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  .home-feature {
    transition: opacity .2s linear;
  }

  .home-feature__track {
    transition: none;
  }
}