/* =============================================================================
   OPTICS // ATMOSPHERIC DEPTH, 3D FOCAL RACK, CHROMATIC GLITCH & SHADERS
   ============================================================================= */

#opticalCompositor,
.fog-field,
.film-grain,
.vcr-raster,
.vcr-scanline,
.chromatic-layer {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
}

#opticalCompositor {
  z-index: 0;
  mix-blend-mode: screen;
}

/* -----------------------------------------------------------------------------
   1. ATMOSPHERIC VOLUMETRIC DEPTH (FOG FIELDS)
   -------------------------------------------------------------------------- */
.fog-field {
  --fog-shift-x: 0px;
  --fog-shift-y: 0px;
  z-index: 1;
  overflow: hidden;
  opacity: 0.92;
  transform: translate3d(var(--fog-shift-x), var(--fog-shift-y), 0) scale(1.08);
  transform-origin: 62% 34%;
  background:
    radial-gradient(
      ellipse 62% 92% at 66% -10%,
      rgba(255, 255, 255, 0.072) 0%,
      rgba(226, 235, 242, 0.026) 30%,
      rgba(132, 151, 169, 0.010) 50%,
      transparent 74%
    ),
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.006) 0%,
      transparent 26%,
      transparent 72%,
      rgba(0, 0, 0, 0.20) 100%
    );
  filter: blur(34px) saturate(0.82);
  will-change: transform;
}

.fog-field::before,
.fog-field::after {
  content: "";
  position: absolute;
  pointer-events: none;
  border-radius: 50%;
  will-change: transform, opacity;
}

.fog-field::before {
  width: 72vw;
  height: 46vw;
  min-width: 760px;
  min-height: 460px;
  right: -18vw;
  top: 24vh;
  opacity: 0.56;
  background: radial-gradient(
    ellipse at center,
    rgba(141, 163, 181, 0.042) 0%,
    rgba(114, 137, 158, 0.018) 38%,
    transparent 72%
  );
  filter: blur(52px);
  animation: fogDriftA 22s ease-in-out infinite alternate;
}

.fog-field::after {
  width: 48vw;
  height: 36vw;
  min-width: 520px;
  min-height: 360px;
  left: 18vw;
  bottom: -18vh;
  opacity: 0.32;
  background: radial-gradient(
    ellipse at center,
    rgba(208, 219, 228, 0.030) 0%,
    rgba(122, 143, 160, 0.012) 40%,
    transparent 74%
  );
  filter: blur(64px);
  animation: fogDriftB 28s ease-in-out infinite alternate;
}

@keyframes fogDriftA {
  0% { transform: translate3d(-1.8vw, -1vh, 0) scale(0.98); }
  48% { transform: translate3d(0.8vw, 0.5vh, 0) scale(1.02); }
  100% { transform: translate3d(2.2vw, 1.4vh, 0) scale(1.05); }
}

@keyframes fogDriftB {
  0% { transform: translate3d(1.2vw, 0.8vh, 0) scale(1.04); }
  55% { transform: translate3d(-0.5vw, -0.4vh, 0) scale(1); }
  100% { transform: translate3d(-1.8vw, -1.2vh, 0) scale(0.97); }
}

/* -----------------------------------------------------------------------------
   2. HIGH-FREQUENCY SENSOR FILM GRAIN
   -------------------------------------------------------------------------- */
.film-grain {
  z-index: 120;
  inset: -8%;
  width: 116vw;
  height: 116vh;
  opacity: 0.044;
  mix-blend-mode: soft-light;
  filter: contrast(1.34) brightness(1.04);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 220 220' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.92' numOctaves='4' seed='7' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  background-size: 220px 220px;
  animation: grainShift 0.16s steps(2, end) infinite;
  will-change: transform;
}

@keyframes grainShift {
  0% { transform: translate3d(-0.6%, 0.2%, 0); }
  20% { transform: translate3d(0.4%, -0.5%, 0); }
  40% { transform: translate3d(-0.2%, 0.6%, 0); }
  60% { transform: translate3d(0.6%, 0.1%, 0); }
  80% { transform: translate3d(-0.4%, -0.3%, 0); }
  100% { transform: translate3d(0.1%, 0.5%, 0); }
}

/* -----------------------------------------------------------------------------
   3. CRT / VCR RASTER FIELD & SCANLINE BEAM
   -------------------------------------------------------------------------- */
.vcr-raster {
  z-index: 121;
  opacity: 0.24;
  mix-blend-mode: soft-light;
  background:
    repeating-linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.014) 0,
      rgba(255, 255, 255, 0.014) 1px,
      transparent 1px,
      transparent 4px
    ),
    linear-gradient(
      90deg,
      rgba(255, 70, 92, 0.005),
      transparent 18%,
      transparent 82%,
      rgba(0, 208, 255, 0.006)
    );
}

.vcr-raster::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.34;
  background: repeating-linear-gradient(
    90deg,
    transparent 0,
    transparent 2px,
    rgba(255, 255, 255, 0.007) 3px,
    transparent 4px
  );
}

.vcr-scanline {
  z-index: 122;
  top: -20vh;
  height: 18vh;
  opacity: 0;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(255, 255, 255, 0.006) 24%,
    rgba(255, 255, 255, 0.030) 49%,
    rgba(255, 255, 255, 0.010) 58%,
    transparent 100%
  );
  filter: blur(1.2px);
  mix-blend-mode: screen;
  animation: scanPass 10.8s linear infinite;
}

@keyframes scanPass {
  0%, 67% { transform: translate3d(0, 0, 0); opacity: 0; }
  70% { opacity: 0.34; }
  76% { opacity: 0.18; }
  88% { transform: translate3d(0, 138vh, 0); opacity: 0.06; }
  89%, 100% { transform: translate3d(0, 138vh, 0); opacity: 0; }
}

/* -----------------------------------------------------------------------------
   4. CHROMATIC ABERRATION FRINGE JITTER (TRANSITION HOOK)
   -------------------------------------------------------------------------- */
.chromatic-layer {
  z-index: 990;
  opacity: 0;
  mix-blend-mode: screen;
  transition: opacity 0.08s ease;
}

.chromatic-layer.active {
  opacity: 0.75;
  animation: microJitter 0.18s var(--ease-glitch) infinite;
}

@keyframes microJitter {
  0% {
    transform: translate(1px, -1px);
    box-shadow: inset 2px 0 rgba(255, 0, 50, 0.20), inset -2px 0 rgba(0, 200, 255, 0.20);
  }
  50% {
    transform: translate(-1px, 1px);
    box-shadow: inset -2px 0 rgba(255, 0, 50, 0.20), inset 2px 0 rgba(0, 200, 255, 0.20);
  }
  100% {
    transform: translate(0, 0);
    box-shadow: none;
  }
}

/* -----------------------------------------------------------------------------
   5. 3D PERSPECTIVE FOCAL RACKING DECK ENGINE
   -------------------------------------------------------------------------- */
.deck-container {
  perspective: 1200px;
  perspective-origin: 50% 48%;
  transform-style: preserve-3d;
}

.slide {
  opacity: 0;
  visibility: hidden;
  transform: scale(0.92) translateZ(-80px);
  filter: blur(18px) brightness(0.3);
  transition:
    transform 0.95s var(--ease-optical),
    filter 0.95s var(--ease-optical),
    opacity 0.75s var(--ease-optical),
    visibility 0.95s;
  z-index: 1;
  pointer-events: none;
}

.slide.active {
  opacity: 1;
  visibility: visible;
  transform: scale(1) translateZ(0);
  filter: blur(0px) brightness(1);
  z-index: 10;
  pointer-events: auto;
}

.slide.exiting {
  opacity: 0;
  visibility: visible !important;
  transform: scale(1.06) translateZ(60px);
  filter: blur(16px) brightness(0.2);
  z-index: 5;
}

/* Masked Typographic Reveals */
.mask-line {
  display: inline-block;
  overflow: hidden;
  vertical-align: top;
}

.mask-reveal {
  display: inline-block;
  transform: translateY(112%);
  filter: blur(5px);
  opacity: 0;
  transition:
    transform 0.72s var(--ease-optical) 0.08s,
    filter 0.72s var(--ease-optical) 0.08s,
    opacity 0.54s var(--ease-optical) 0.08s;
}

.slide.active .mask-reveal {
  transform: translateY(0);
  filter: blur(0px);
  opacity: 1;
}

.slide.active .mask-line:nth-of-type(2) .mask-reveal {
  transition-delay: 0.12s;
}

/* -----------------------------------------------------------------------------
   6. OPTICAL FREQUENCY & CHROMATIC HALATION ENGINE
   -------------------------------------------------------------------------- */
@keyframes neonRetinalHum {
  0%, 100% {
    opacity: 0.88;
    filter: drop-shadow(0 0 1px rgba(0, 230, 255, 0.9))
      drop-shadow(0 0 8px rgba(0, 230, 255, 0.45))
      drop-shadow(0 0 24px rgba(0, 230, 255, 0.20));
  }
  24% {
    opacity: 0.95;
    filter: drop-shadow(0 0 1.5px rgba(0, 230, 255, 0.95))
      drop-shadow(0 0 10px rgba(0, 230, 255, 0.55))
      drop-shadow(0 0 30px rgba(0, 230, 255, 0.28));
  }
  50% {
    opacity: 0.86;
    filter: drop-shadow(0 0 1px rgba(0, 230, 255, 0.85))
      drop-shadow(0 0 7px rgba(0, 230, 255, 0.40))
      drop-shadow(0 0 20px rgba(0, 230, 255, 0.16));
  }
  73% {
    opacity: 0.97;
    filter: drop-shadow(0 0 2px rgba(0, 230, 255, 1.0))
      drop-shadow(0 0 12px rgba(0, 230, 255, 0.60))
      drop-shadow(0 0 34px rgba(0, 230, 255, 0.32));
  }
}

@keyframes dynamicRetinalHum {
  0%, 100% {
    opacity: var(--freq-min-opacity, 0.88);
    filter:
      drop-shadow(0 0 var(--freq-spread-1, 1px) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 100%), transparent))
      drop-shadow(0 0 var(--freq-spread-2, 10px) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 60%), transparent))
      drop-shadow(0 0 var(--freq-spread-3, 30px) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 25%), transparent));
  }
  24% {
    opacity: var(--freq-max-opacity, 1.0);
    filter:
      drop-shadow(0 0 calc(var(--freq-spread-1, 1px) * 1.5) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 100%), transparent))
      drop-shadow(0 0 calc(var(--freq-spread-2, 10px) * 1.4) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 70%), transparent))
      drop-shadow(0 0 calc(var(--freq-spread-3, 30px) * 1.3) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 35%), transparent));
  }
  50% {
    opacity: calc(var(--freq-min-opacity, 0.88) * 0.95);
    filter:
      drop-shadow(0 0 calc(var(--freq-spread-1, 1px) * 0.9) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 80%), transparent))
      drop-shadow(0 0 calc(var(--freq-spread-2, 10px) * 0.9) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 45%), transparent))
      drop-shadow(0 0 calc(var(--freq-spread-3, 30px) * 0.9) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 20%), transparent));
  }
  73% {
    opacity: var(--freq-max-opacity, 1.0);
    filter:
      drop-shadow(0 0 calc(var(--freq-spread-1, 1px) * 1.8) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 100%), transparent))
      drop-shadow(0 0 calc(var(--freq-spread-2, 10px) * 1.6) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 80%), transparent))
      drop-shadow(0 0 calc(var(--freq-spread-3, 30px) * 1.4) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 40%), transparent));
  }
}

@keyframes dynamicTextHum {
  0%, 100% {
    opacity: var(--freq-min-opacity, 0.88);
    text-shadow:
      0 0 var(--freq-spread-1, 1px) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 100%), transparent),
      0 0 var(--freq-spread-2, 8px) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 60%), transparent),
      0 0 var(--freq-spread-3, 24px) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 25%), transparent);
  }
  24% {
    opacity: var(--freq-max-opacity, 0.98);
    text-shadow:
      0 0 calc(var(--freq-spread-1, 1px) * 1.5) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 100%), transparent),
      0 0 calc(var(--freq-spread-2, 8px) * 1.4) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 75%), transparent),
      0 0 calc(var(--freq-spread-3, 24px) * 1.3) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 35%), transparent);
  }
  50% {
    opacity: calc(var(--freq-min-opacity, 0.88) * 0.96);
    text-shadow:
      0 0 calc(var(--freq-spread-1, 1px) * 0.9) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 80%), transparent),
      0 0 calc(var(--freq-spread-2, 8px) * 0.8) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 45%), transparent),
      0 0 calc(var(--freq-spread-3, 24px) * 0.8) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 20%), transparent);
  }
  73% {
    opacity: var(--freq-max-opacity, 1.0);
    text-shadow:
      0 0 calc(var(--freq-spread-1, 1px) * 1.8) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 100%), transparent),
      0 0 calc(var(--freq-spread-2, 8px) * 1.6) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 85%), transparent),
      0 0 calc(var(--freq-spread-3, 24px) * 1.5) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 45%), transparent);
  }
}

@keyframes anamorphicFlare {
  0%, 100% {
    opacity: var(--freq-min-opacity, 0.85);
    filter: drop-shadow(0 0 1px var(--freq-glow-color, var(--accent-cyan)))
      drop-shadow(-25px 0 10px color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 100%), transparent))
      drop-shadow(25px 0 10px color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 100%), transparent))
      drop-shadow(-70px 0 25px color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 40%), transparent))
      drop-shadow(70px 0 25px color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-min, 0.3) * 40%), transparent));
  }
  50% {
    opacity: var(--freq-max-opacity, 1.0);
    filter: drop-shadow(0 0 2px var(--freq-glow-color, var(--accent-cyan)))
      drop-shadow(-40px 0 16px color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 100%), transparent))
      drop-shadow(40px 0 16px color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 100%), transparent))
      drop-shadow(-110px 0 45px color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 50%), transparent))
      drop-shadow(110px 0 45px color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.9) * 50%), transparent));
  }
}

/* -----------------------------------------------------------------------------
   7. DIRECTIONAL POLAR RAY SHADERS
   -------------------------------------------------------------------------- */
.fx-directional-light {
  filter:
    drop-shadow(calc(var(--cast-x, 0px) * 0.35) calc(var(--cast-y, 0px) * 0.35) var(--freq-spread-1, 1px) var(--freq-glow-color, var(--accent-cyan)))
    drop-shadow(calc(var(--cast-x, 0px) * 1.0) calc(var(--cast-y, 0px) * 1.0) var(--freq-spread-2, 12px) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.8) * 75%), transparent))
    drop-shadow(calc(var(--cast-x, 0px) * 1.8) calc(var(--cast-y, 0px) * 1.8) var(--freq-spread-3, 35px) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.8) * 35%), transparent));
  will-change: filter;
  transition: filter 0.08s cubic-bezier(0.16, 1, 0.3, 1);
}

.fx-directional-textured {
  filter: url('#directionalPhosphorFilter')
    drop-shadow(calc(var(--cast-x, 0px) * 0.35) calc(var(--cast-y, 0px) * 0.35) var(--freq-spread-1, 1px) var(--freq-glow-color, var(--accent-cyan)))
    drop-shadow(calc(var(--cast-x, 0px) * 1.0) calc(var(--cast-y, 0px) * 1.0) var(--freq-spread-2, 12px) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.8) * 75%), transparent))
    drop-shadow(calc(var(--cast-x, 0px) * 1.8) calc(var(--cast-y, 0px) * 1.8) var(--freq-spread-3, 35px) color-mix(in srgb, var(--freq-glow-color, var(--accent-cyan)) calc(var(--glow-alpha-max, 0.8) * 35%), transparent));
  will-change: filter;
  transition: filter 0.08s cubic-bezier(0.16, 1, 0.3, 1);
}

.fx-textured-aura {
  filter: url('#directionalPhosphorFilter');
  will-change: filter;
}

/* Preset Utilities */
.optics-neon-glow {
  color: #ffffff !important;
  text-shadow:
    0 0 2px rgba(255, 255, 255, 0.9),
    0 0 8px var(--accent-cyan),
    0 0 22px rgba(0, 230, 255, 0.65),
    0 0 45px rgba(0, 230, 255, 0.35);
  animation: neonRetinalHum 3.8s ease-in-out infinite;
  will-change: filter, opacity;
}

.optics-amber-glow {
  color: #ffffff !important;
  text-shadow:
    0 0 2px rgba(255, 255, 255, 0.9),
    0 0 8px var(--accent-amber),
    0 0 20px rgba(255, 170, 0, 0.65),
    0 0 40px rgba(255, 170, 0, 0.30);
  animation: neonRetinalHum 4.2s ease-in-out infinite reverse;
  will-change: filter, opacity;
}

.layer-phosphor-raster {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    rgba(0, 0, 0, 0.30) 0px,
    rgba(0, 0, 0, 0.30) 1px,
    transparent 1px,
    transparent 2px
  );
  z-index: 5;
  pointer-events: none;
  opacity: 0.60;
}

/* Animations for Metrology Rigs */
@keyframes rotateReticle {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes scanLaser {
  0% { left: 0%; opacity: 0.2; }
  50% { left: 95%; opacity: 1; }
  100% { left: 0%; opacity: 0.2; }
}

@keyframes svgDashFlow {
  to { stroke-dashoffset: -24; }
}

@keyframes beaconPulse {
  0%, 100% { opacity: 0.95; }
  50% { opacity: 0.35; }
}

@media (prefers-reduced-motion: reduce) {
  .fog-field::before,
  .fog-field::after,
  .film-grain,
  .vcr-scanline {
    animation: none;
  }
}