/* ============================================================
   motion.css — keyframes, reveal engine, scroll-driven animation
   Every animation runs on transform/opacity (compositor). Spec §6.
   JS-gated hidden states live behind `.js` so a no-JS page is fully
   visible (never an invisible page — §6.3).
   ============================================================ */

/* ══ Reveal engine (§6.4) ══════════════════════════════════ */
.js [data-reveal] {
  opacity: 0;
  transform: translate3d(0, var(--travel-y), 0);
  transition:
    opacity   var(--d-slow) var(--e-enter) var(--reveal-delay, 0ms),
    transform var(--d-slow) var(--e-enter) var(--reveal-delay, 0ms);
  will-change: transform, opacity;
}
.js [data-reveal].is-revealed {
  opacity: 1;
  transform: translate3d(0, 0, 0);
  will-change: auto;
}

/* Variants — direction-aware via --dir (§8.5) */
.js [data-reveal="fade"]        { transform: none; }
.js [data-reveal="slide-start"] { transform: translate3d(calc(var(--travel-x) * var(--dir) * -1), 0, 0); }
.js [data-reveal="slide-end"]   { transform: translate3d(calc(var(--travel-x) * var(--dir)), 0, 0); }
.js [data-reveal="scale"]       { transform: scale(var(--scale-in)); }
.js [data-reveal="rise-scale"]  { transform: translate3d(0, var(--travel-y), 0) scale(var(--scale-in)); }
.js [data-reveal="slide-start"].is-revealed,
.js [data-reveal="slide-end"].is-revealed,
.js [data-reveal="scale"].is-revealed,
.js [data-reveal="rise-scale"].is-revealed { transform: translate3d(0, 0, 0) scale(1); }

/* Eyebrow hairline draw (§6.6) — collapsed only when JS can reveal it */
.js .eyebrow::before { transform: scaleX(0); }
.js .is-revealed .eyebrow::before { transform: scaleX(1); }

/* ══ Hero load sequence keyframes (§6.5) ═══════════════════ */
@keyframes hero-zoom       { from { transform: scale(1.08); } to { transform: scale(1); } }
@keyframes hero-scrim-lift { to { opacity: 0.85; } }
@keyframes fade-rise       { to { opacity: 1; transform: translateY(0); } }
@keyframes fade-in         { to { opacity: 1; } }
@keyframes rule-grow       { to { transform: scaleX(1); } }
@keyframes word-in         { to { opacity: 1; transform: translate3d(0, 0, 0); filter: blur(0); } }

/* ══ Hero badge — dominant logo entrance + idle ambience ═══ */
@keyframes badge-in {
  60%  { opacity: 1; }
  100% { opacity: 1; transform: scale(1) rotate(0deg); filter: blur(0); }
}
@keyframes badge-glow-pulse {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50%      { opacity: 1;   transform: scale(1.08); }
}
@keyframes sheen-rotate {
  to { transform: rotate(360deg); }
}
@keyframes particle-drift {
  0%   { transform: translate3d(0, 0, 0); opacity: 0; }
  12%  { opacity: 0.6; }
  88%  { opacity: 0.35; }
  100% { transform: translate3d(var(--drift-x, 12px), var(--drift-y, -55vh), 0); opacity: 0; }
}
@keyframes cta-breathe {
  0%, 100% { box-shadow: 0 0 0 0 var(--amber-glow-20); }
  50%      { box-shadow: 0 0 22px 5px var(--amber-glow-40); }
}
@keyframes progress-fill {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}

/* ══ Loops & micro-interactions ═══════════════════════════ */
@keyframes cue-bob {
  0%, 100% { transform: translateY(0);   opacity: 0.5; }
  50%      { transform: translateY(8px); opacity: 1;   }
}
@keyframes ping {
  0%       { transform: scale(1);   opacity: 0.55; }
  70%,100% { transform: scale(1.9); opacity: 0;    }
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Form states (§9.7) */
@keyframes shake {
  10%,90%     { transform: translateX(-1px); }
  20%,80%     { transform: translateX(2px);  }
  30%,50%,70% { transform: translateX(-4px); }
  40%,60%     { transform: translateX(4px);  }
}
@keyframes pop-in {
  from { opacity: 0; transform: scale(0.9) translateY(8px); }
  to   { opacity: 1; transform: scale(1)   translateY(0);   }
}
@keyframes field-pulse {
  0%   { border-color: var(--amber); box-shadow: 0 0 0 4px var(--amber-glow-20); }
  100% { border-color: var(--border-strong); box-shadow: 0 0 0 4px transparent; }
}

/* ══ Scroll-driven animation — native, off main thread (§6.7) ══ */
@supports (animation-timeline: view()) {
  .hero__bg {
    animation: hero-drift linear both;
    animation-timeline: view();
    animation-range: entry 0% exit 100%;
  }
  @keyframes hero-drift {
    from { transform: translate3d(0, 0, 0); }
    to   { transform: translate3d(0, 12%, 0); }
  }

  .timeline__spine {
    animation: spine-draw linear both;
    animation-timeline: view(block);
    animation-range: entry 30% cover 70%;
  }
  @keyframes spine-draw {
    from { transform: scaleY(0); }
    to   { transform: scaleY(1); }
  }
}