/* ============================================================
   SERAPHIN — hero.

   Two modes, decided by whether assets/img/explode/ holds a real
   disassembly frame sequence:

     STATIC     the whole product photograph, easing forward on scroll.
                The proven treatment. Active until real footage exists.
     SCRUBBER   scroll drives a canvas frame sequence extracted from a
                genuine image-to-video disassembly of that photograph.

   Both write --t (0..1) on .xv-stage, so the headline recede, callout
   sequence and progress rail behave identically in either mode.

   A single 2D photo must never be cut into parts: lifting a component
   leaves a hole with no pixel data behind it, and every cut edge is an
   arbitrary slice through a continuous object, so it reads as torn.
   ============================================================ */

.xv {
  position: relative;
  /* generous runway so the motion reads slow and deliberate */
  height: 320vh;
  background: var(--bg);
}

.xv-stage {
  position: sticky;
  top: 0;
  height: 100svh;
  min-height: 600px;
  overflow: hidden;
}

/* ---------- headline: over the product, recedes as it separates ---------- */
.xv-head {
  position: absolute;
  top: clamp(1.5rem, 5vh, 4rem);
  left: 0; right: 0;
  z-index: 20;
  padding-inline: var(--bleed);
  max-width: var(--wrap);
  margin-inline: auto;
  pointer-events: none;
  opacity: clamp(.12, calc(1 - var(--t, 0) * 1.35), 1);
  transition: opacity .2s linear;
}
.xv-head h2 {
  font-size: clamp(2.4rem, 6vw, 5.2rem);
  line-height: .95;
  letter-spacing: -.035em;
  max-width: 14ch;
}
.xv-head .lead {
  margin-top: clamp(1rem, 2vh, 1.6rem);
  font-size: clamp(.95rem, 1.15vw, 1.15rem);
  max-width: 38ch;
}

/* ---------- stage ---------- */
.xv-canvas {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(9rem, 24vh, 15rem) var(--bleed) clamp(4.5rem, 11vh, 7rem);
}
.xv-rig {
  position: relative;
  width: min(100%, 82vh, 760px);
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* STATIC mode — the whole photograph, easing forward. */
.xv-hero-shot {
  width: 100%;
  height: auto;
  display: block;
  transform: scale(calc(1 + var(--t, 0) * .11));
  transition: transform .14s linear;
  will-change: transform;
}

/* SCRUBBER mode — canvas sits on top of the first-frame image and only
   takes over once it has actually painted, so there is never a blank hero. */
.xv-frames {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  opacity: 0;
}
.xv-ready .xv-frames { opacity: 1; }
.xv-ready .xv-hero-shot { visibility: hidden; }

/* ---------- callouts ---------- */
.xv-note {
  position: absolute;
  z-index: 30;
  font-family: var(--body);
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #A8AEB6;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: .6rem;
  opacity: clamp(0, calc((var(--t, 0) - var(--at, 0)) * 7), 1);
  transform: translateY(calc((1 - clamp(0, calc((var(--t, 0) - var(--at, 0)) * 7), 1)) * 8px));
  transition: opacity .2s linear, transform .2s ease-out;
  pointer-events: none;
}
.xv-note-r { flex-direction: row-reverse; }
.xv-dot {
  width: 5px; height: 5px;
  background: var(--red);
  border-radius: 50%;
  flex: none;
  box-shadow: 0 0 0 4px rgba(237, 28, 36, .14);
}

/* ---------- progress rail ---------- */
.xv-rail {
  position: absolute;
  left: 0; right: 0;
  bottom: clamp(1.25rem, 3.5vh, 2.25rem);
  z-index: 20;
  padding-inline: var(--bleed);
  max-width: var(--wrap);
  margin-inline: auto;
  pointer-events: none;
}
.xv-track { position: relative; height: 1px; background: var(--line); }
.xv-fill {
  position: absolute; inset: 0 auto 0 0;
  width: calc(var(--t, 0) * 100%);
  background: var(--red);
  transition: width .12s linear;
}
.xv-steps {
  display: flex; justify-content: space-between;
  margin-top: .8rem;
  font-family: var(--display);
  font-size: .64rem; font-weight: 700;
  letter-spacing: .16em; text-transform: uppercase;
  color: #5A6068;
}
.xv-steps span { transition: color .2s; }
.xv-steps span[data-on="1"] { color: var(--red); }

@media (max-height: 700px) {
  .xv-head .lead { display: none; }
  .xv-steps { font-size: .58rem; }
}
@media (max-width: 640px) {
  .xv-note { font-size: .6rem; letter-spacing: .1em; }
}

/* ---------- reduced motion / no JS: flatten to a static composition ---------- */
@media (prefers-reduced-motion: reduce) {
  .xv { height: auto; }
  .xv-stage { position: static; height: auto; min-height: 0; padding: var(--gap-xl) 0; }
  .xv-head { position: static; opacity: 1; margin-bottom: var(--gap-lg); }
  .xv-canvas { position: static; display: block; padding: 0 var(--bleed); }
  .xv-rig { width: min(100%, 760px); margin-inline: auto; }
  .xv-hero-shot { transform: none; transition: none; visibility: visible; }
  .xv-frames { display: none; }
  .xv-note { opacity: 1; transform: none; }
  .xv-rail { display: none; }
}

.no-js .xv { height: auto; }
.no-js .xv-stage { position: static; height: auto; min-height: 0; padding: var(--gap-xl) 0; }
.no-js .xv-head { position: static; opacity: 1; margin-bottom: var(--gap-lg); }
.no-js .xv-canvas { position: static; display: block; padding: 0 var(--bleed); }
.no-js .xv-rig { width: min(100%, 760px); margin-inline: auto; }
.no-js .xv-hero-shot { transform: none; visibility: visible; }
.no-js .xv-frames { display: none; }
.no-js .xv-note { opacity: 1; transform: none; }
.no-js .xv-rail { display: none; }