/* ==========================================================================
   Signal Verse AR — Motion system
   Scroll reveal · Splash · Page transitions · Keyframe library · Skeletons
   ========================================================================== */

/* ---- Scroll reveal ------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translate3d(0, 28px, 0);
  filter: blur(6px);
  transition:
    opacity var(--dur-slower) var(--ease-out),
    transform var(--dur-slower) var(--ease-out),
    filter var(--dur-slower) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
  filter: none;
}

.reveal--fade  { transform: none; }
.reveal--left  { transform: translate3d(-34px, 0, 0); }
.reveal--right { transform: translate3d(34px, 0, 0); }
.reveal--scale { transform: scale(0.94); }
.reveal--zoom  { transform: scale(1.06); filter: blur(10px); }
.reveal--rise  { transform: translate3d(0, 56px, 0); }
.reveal--clip {
  transform: none;
  filter: none;
  clip-path: inset(0 0 100% 0);
  opacity: 1;
  transition: clip-path var(--dur-cinema) var(--ease-out);
}
.reveal--clip.is-visible { clip-path: inset(0 0 0 0); }

/* Stagger children — delay index set inline via --i */
.stagger > * {
  opacity: 0;
  transform: translate3d(0, 24px, 0);
  transition:
    opacity var(--dur-slower) var(--ease-out),
    transform var(--dur-slower) var(--ease-out);
  transition-delay: calc(var(--i, 0) * 70ms);
}
.stagger.is-visible > * { opacity: 1; transform: none; }

/* Character/word split reveal (built by reveal.js) */
.split-line { display: block; overflow: hidden; padding-bottom: 0.08em; margin-bottom: -0.08em; }
.split-line__inner {
  display: block;
  transform: translateY(115%);
  transition: transform var(--dur-cinema) var(--ease-out);
  transition-delay: calc(var(--i, 0) * 78ms);
}
.is-visible .split-line__inner { transform: translateY(0); }

/* ---- Splash -------------------------------------------------------------- */

.splash {
  position: fixed;
  inset: 0;
  z-index: var(--z-splash);
  display: grid;
  place-items: center;
  background: var(--bg);
  transition: opacity var(--dur-slower) var(--ease-out),
              visibility 0s linear var(--dur-slower);
}
.splash.is-done {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.splash__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}
.splash__mark {
  width: 74px; height: 74px;
  border-radius: 22px;
  display: grid;
  place-items: center;
  background: linear-gradient(140deg, var(--accent), var(--cyan));
  box-shadow: 0 16px 44px rgba(10, 132, 255, 0.34);
  animation: splash-mark 1.5s var(--ease-spring) both;
}
.splash__mark svg { width: 40px; height: 40px; }
.splash__wordmark {
  font-family: var(--font-display);
  font-size: var(--fs-h4);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-tight);
  animation: fade-up var(--dur-slower) var(--ease-out) 260ms both;
}
.splash__bar {
  width: 168px; height: 3px;
  border-radius: var(--r-pill);
  background: var(--border);
  overflow: hidden;
  animation: fade-in var(--dur-base) linear 180ms both;
}
.splash__bar span {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  transition: width 220ms var(--ease-out);
}
.splash__status {
  font-size: var(--fs-caption);
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  letter-spacing: var(--tracking-wide);
  min-height: 1em;
}

@keyframes splash-mark {
  0%   { opacity: 0; transform: scale(0.5) rotate(-24deg); }
  60%  { opacity: 1; transform: scale(1.06) rotate(4deg); }
  100% { opacity: 1; transform: scale(1) rotate(0); }
}

/* ---- Page transition ----------------------------------------------------- */

.page-veil {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: var(--bg);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out), visibility 0s linear var(--dur-base);
}
html.is-leaving .page-veil {
  opacity: 1;
  visibility: visible;
  transition-delay: 0s;
}
html.is-leaving main { transform: scale(0.992); filter: blur(3px); opacity: 0.55; }

main {
  transition: transform var(--dur-base) var(--ease-out),
              filter var(--dur-base) var(--ease-out),
              opacity var(--dur-base) var(--ease-out);
}

body.is-entering main { animation: page-in var(--dur-slower) var(--ease-out) both; }

@keyframes page-in {
  from { opacity: 0; transform: translateY(10px) scale(0.996); filter: blur(4px); }
  to   { opacity: 1; transform: none; filter: none; }
}

/* ---- Keyframe library ---------------------------------------------------- */

@keyframes fade-in   { from { opacity: 0; } to { opacity: 1; } }
@keyframes fade-up   { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: none; } }
@keyframes fade-down { from { opacity: 0; transform: translateY(-20px); } to { opacity: 1; transform: none; } }
@keyframes scale-in  { from { opacity: 0; transform: scale(0.9); } to { opacity: 1; transform: none; } }
@keyframes pop-in    { 0% { opacity: 0; transform: scale(0.6); } 70% { transform: scale(1.06); } 100% { opacity: 1; transform: scale(1); } }
@keyframes slide-left  { from { opacity: 0; transform: translateX(28px); } to { opacity: 1; transform: none; } }
@keyframes slide-right { from { opacity: 0; transform: translateX(-28px); } to { opacity: 1; transform: none; } }

@keyframes float-y {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-14px); }
}
@keyframes float-soft {
  0%, 100% { transform: translate3d(0, 0, 0) rotate(0deg); }
  33%      { transform: translate3d(6px, -12px, 0) rotate(1.4deg); }
  66%      { transform: translate3d(-5px, -6px, 0) rotate(-1deg); }
}
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes spin-slow { to { transform: rotate(360deg); } }

@keyframes breathe {
  0%, 100% { transform: scale(1); opacity: 0.75; }
  50%      { transform: scale(1.08); opacity: 1; }
}
@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-ring); }
  70%      { box-shadow: 0 0 0 18px transparent; }
}
@keyframes shimmer { to { background-position: 200% 0; } }
@keyframes draw-line { to { stroke-dashoffset: 0; } }
@keyframes wave-shift { to { transform: translateX(-50%); } }
@keyframes bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-4px); } }

.anim-float      { animation: float-y 6s var(--ease-in-out) infinite; }
.anim-float-soft { animation: float-soft 12s var(--ease-in-out) infinite; }
.anim-breathe    { animation: breathe 4.5s var(--ease-in-out) infinite; }
.anim-spin-slow  { animation: spin 26s linear infinite; }
.anim-bob        { animation: bob 2.6s var(--ease-in-out) infinite; }
.anim-delay-1 { animation-delay: 0.6s; }
.anim-delay-2 { animation-delay: 1.2s; }
.anim-delay-3 { animation-delay: 1.9s; }
.anim-delay-4 { animation-delay: 2.6s; }

/* ---- Skeleton loading ---------------------------------------------------- */

.skeleton {
  position: relative;
  overflow: hidden;
  background: var(--surface-muted);
  border-radius: var(--r-sm);
}
.skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, var(--surface-hover), transparent);
  background-size: 200% 100%;
  animation: shimmer 1.5s linear infinite;
}
.skeleton--text { height: 12px; margin-block: 6px; }
.skeleton--title { height: 20px; width: 60%; }
.skeleton--block { height: 140px; border-radius: var(--r-lg); }
.skeleton--circle { border-radius: 50%; aspect-ratio: 1; width: 44px; }

/* ---- Spinners ------------------------------------------------------------ */

.spinner {
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 2.2px solid var(--border-strong);
  border-top-color: var(--accent);
  animation: spin 720ms linear infinite;
}
.spinner--lg { width: 40px; height: 40px; border-width: 3px; }
.spinner--light { border-color: rgba(255,255,255,0.25); border-top-color: #fff; }

/* ---- Success / completion ------------------------------------------------ */

.success-check {
  width: 76px; height: 76px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--success-soft);
  color: var(--success);
  animation: pop-in var(--dur-slower) var(--ease-spring) both;
}
.success-check svg { width: 38px; height: 38px; }
.success-check svg path {
  stroke-dasharray: 48;
  stroke-dashoffset: 48;
  animation: draw-line var(--dur-slower) var(--ease-out) 220ms forwards;
}

.confetti-layer {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  border-radius: inherit;
}
.confetti {
  position: absolute;
  top: -14px;
  width: 8px; height: 12px;
  border-radius: 2px;
  opacity: 0;
  animation: confetti-fall var(--cf-dur, 2.6s) var(--ease-standard) var(--cf-delay, 0s) forwards;
}
@keyframes confetti-fall {
  0%   { opacity: 0; transform: translate3d(0, -20px, 0) rotate(0deg); }
  12%  { opacity: 1; }
  100% { opacity: 0; transform: translate3d(var(--cf-x, 0), var(--cf-y, 460px), 0) rotate(var(--cf-r, 620deg)); }
}

/* ---- Signal wave decoration ---------------------------------------------- */

.wave-strip {
  width: 100%;
  height: 120px;
  overflow: hidden;
  opacity: 0.5;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 18%, #000 82%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 18%, #000 82%, transparent);
}
.wave-strip svg { width: 200%; height: 100%; animation: wave-shift 14s linear infinite; }

/* ---- Hover lighting on media --------------------------------------------- */

.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-xl);
  background: var(--surface-muted);
}
.media img,
.media canvas,
.media svg {
  width: 100%;
  transition: transform var(--dur-cinema) var(--ease-out), filter var(--dur-slow) var(--ease-out);
}
.media:hover img { transform: scale(1.045); }
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, rgba(255,255,255,0.18), transparent 46%);
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out);
  pointer-events: none;
}
.media:hover::after { opacity: 1; }

.img-lazy {
  opacity: 0;
  transform: scale(1.02);
  transition: opacity var(--dur-slower) var(--ease-out), transform var(--dur-cinema) var(--ease-out);
}
.img-lazy.is-loaded { opacity: 1; transform: none; }

/* ---- Magnetic ------------------------------------------------------------ */

.magnetic { will-change: transform; }

/* ---- Marquee-free helpers ------------------------------------------------ */

.gpu { transform: translateZ(0); backface-visibility: hidden; }