/* ═══════════════════════════════════════════════════════════════
   SOFTHIRE SYSTEMS — Motion Engine CSS
   Phase 2: Global reveal animations + progress + transitions
   ═══════════════════════════════════════════════════════════════ */

/* ── FX-14: Scroll reveals ───────────────────────────────────── */
/*
 * Fail-open: elements are ONLY hidden when html.motion-ready is present
 * (set synchronously at the top of motion.js). No JS = visible.
 * JS adds .is-in when element enters viewport, or immediately if already
 * in view. Safety net at 2500ms adds .is-in to anything remaining.
 */
@media (prefers-reduced-motion: no-preference) {
  html.motion-ready [data-reveal]:not(.is-in) {
    opacity: 0;
    will-change: opacity, transform;
  }
  html.motion-ready [data-reveal="up"]:not(.is-in)    { transform: translateY(60px); }
  html.motion-ready [data-reveal="left"]:not(.is-in)  { transform: translateX(-90px); }
  html.motion-ready [data-reveal="right"]:not(.is-in) { transform: translateX(90px); }
  html.motion-ready [data-reveal="fade"]:not(.is-in)  { transform: none; }

  html.motion-ready [data-reveal].is-in {
    opacity: 1;
    transform: none;
    transition:
      opacity 800ms var(--sys-ease-out, cubic-bezier(.2,.8,.2,1)),
      transform 800ms var(--sys-ease-out, cubic-bezier(.2,.8,.2,1));
    transition-delay: var(--delay, 0s);
  }

  /* Stagger children */
  html.motion-ready [data-reveal-stagger]:not(.is-in) > * {
    opacity: 0;
    transform: translateY(40px);
  }
  html.motion-ready [data-reveal-stagger].is-in > * {
    opacity: 1;
    transform: none;
    transition:
      opacity 800ms var(--sys-ease-out, cubic-bezier(.2,.8,.2,1)),
      transform 800ms var(--sys-ease-out, cubic-bezier(.2,.8,.2,1));
  }
  html.motion-ready [data-reveal-stagger].is-in > *:nth-child(1)  { transition-delay:   0ms; }
  html.motion-ready [data-reveal-stagger].is-in > *:nth-child(2)  { transition-delay:  80ms; }
  html.motion-ready [data-reveal-stagger].is-in > *:nth-child(3)  { transition-delay: 160ms; }
  html.motion-ready [data-reveal-stagger].is-in > *:nth-child(4)  { transition-delay: 240ms; }
  html.motion-ready [data-reveal-stagger].is-in > *:nth-child(5)  { transition-delay: 320ms; }
  html.motion-ready [data-reveal-stagger].is-in > *:nth-child(6)  { transition-delay: 400ms; }
  html.motion-ready [data-reveal-stagger].is-in > *:nth-child(n+7){ transition-delay: 480ms; }
}

/* Reduced motion: everything visible, nothing animates */
@media (prefers-reduced-motion: reduce) {
  [data-reveal],
  [data-reveal-stagger] > * {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
    transition: none !important;
  }
}

@keyframes reveal-up {
  from { opacity: 0; transform: translateY(60px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes reveal-left {
  from { opacity: 0; transform: translateX(-90px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes reveal-right {
  from { opacity: 0; transform: translateX(90px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes reveal-fade {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ── FX-15: Line draw ────────────────────────────────────────── */
.sys-line-draw {
  display: block;
  height: 2px;
  background: var(--sys-gold, #C9A84C);
  transform-origin: left;
  transform: scaleX(0);
  margin-bottom: 32px;
}
@media (prefers-reduced-motion: no-preference) {
  .js .sys-line-draw {
    transition: transform 700ms var(--sys-ease-out, cubic-bezier(.2,.8,.2,1));
  }
  .js .sys-line-draw.is-revealed {
    transform: scaleX(1);
  }
  @supports (animation-timeline: view()) {
    .js .sys-line-draw {
      animation: line-draw 700ms var(--sys-ease-out, cubic-bezier(.2,.8,.2,1)) both;
      animation-timeline: view();
      animation-range: entry 5% cover 35%;
      transition: none;
    }
  }
}
/* Always show line without JS or with reduced motion */
@media (prefers-reduced-motion: reduce) {
  .sys-line-draw { transform: scaleX(1); }
}
.no-js .sys-line-draw { transform: scaleX(1); }
@keyframes line-draw {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}

/* ── FX-00: Scroll progress (driven by JS) ───────────────────── */
/* #scroll-progress styles are in system.css */

/* ── Split-word reveal (FX-07) — word wrappers ───────────────── */
/* Words are wrapped by motion.js; CSS handles the animation */
@media (prefers-reduced-motion: no-preference) {
  .js .word-wrap {
    display: inline-block;
    overflow: hidden;
    vertical-align: bottom;
  }
  .js .word-inner {
    display: inline-block;
    transform: translateY(110%);
    filter: blur(6px);
    transition:
      transform var(--sys-dur-slow, 800ms) var(--sys-ease-out, cubic-bezier(.2,.8,.2,1)),
      filter var(--sys-dur-slow, 800ms) ease;
  }
  .js .h2-revealed .word-inner {
    transform: translateY(0);
    filter: blur(0);
  }
  /* Stagger per word index set by JS as --wi */
  .js .word-inner { transition-delay: calc(var(--wi, 0) * 80ms); }
}

/* ── Deck: base snap deck ────────────────────────────────────── */
.deck { width: 100%; }
.deck-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.deck-count {
  font-family: var(--sys-font-mono, 'IBM Plex Mono', monospace);
  font-size: 12px;
  color: var(--sys-text-3, #8E97AF);
  margin-right: auto;
}
.deck-count b {
  color: var(--sys-gold, #C9A84C);
  font-weight: 500;
}
.deck-progress {
  flex: 1;
  max-width: 120px;
  height: 2px;
  background: var(--sys-line, rgba(255,255,255,.08));
  border-radius: 2px;
  overflow: hidden;
}
.deck-progress i {
  display: block;
  height: 100%;
  background: var(--sys-gold, #C9A84C);
  border-radius: 2px;
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 300ms var(--sys-ease-out, cubic-bezier(.2,.8,.2,1));
}
.deck-arrow {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--sys-line-2, rgba(255,255,255,.14));
  display: grid;
  place-items: center;
  color: var(--sys-text, #F4F1EA);
  background: none;
  cursor: pointer;
  transition: border-color .25s, background .25s, transform .25s;
  font-size: 20px;
  line-height: 1;
}
.deck-arrow:hover {
  border-color: var(--sys-gold, #C9A84C);
  background: rgba(201,168,76,.12);
  transform: scale(1.06);
}
.deck-arrow:disabled,
.deck-arrow[disabled] {
  opacity: .35;
  pointer-events: none;
}
.deck-arrow:focus-visible {
  outline: 2px solid var(--sys-gold-hi, #E3C878);
  outline-offset: 3px;
}
.deck-track {
  display: flex;
  gap: 22px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  padding: 14px 4px 34px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  -webkit-mask-image: linear-gradient(90deg, #000 78%, transparent);
  mask-image: linear-gradient(90deg, #000 78%, transparent);
}
.deck-track::-webkit-scrollbar { display: none; }
.deck-slot {
  flex: 0 0 min(380px, 82vw);
  scroll-snap-align: start;
  display: flex;
}
.deck-slot > .sys-card { flex: 1; }

/* Deck slot entrance animation (IntersectionObserver fallback) */
@media (prefers-reduced-motion: no-preference) {
  @keyframes deck-slot-in {
    from { opacity: .2; transform: translateX(140px) scale(.86) rotateY(-22deg); filter: blur(3px); }
    to   { opacity: 1;  transform: none; filter: none; }
  }
  @supports (animation-timeline: view(inline)) {
    .deck-slot {
      animation: deck-slot-in linear both;
      animation-timeline: view(inline);
      animation-range: entry 0% cover 45%;
    }
  }
  .deck-slot.deck-enter {
    animation: deck-slot-in 600ms var(--sys-ease-out, cubic-bezier(.2,.8,.2,1)) both;
  }
}

/* ── Reduced motion: flatten all deck motion ─────────────────── */
@media (prefers-reduced-motion: reduce) {
  .js .word-inner {
    transform: none !important;
    filter: none !important;
    transition: none !important;
  }
  .deck-slot { animation: none !important; }
  .deck-track { scroll-behavior: auto; }
}