/* ============================================================
   SCROLL FX — Block Gemini
   Cinematic scroll enhancements: progress, reveals, section ticker.
============================================================ */

/* ---------- Top scroll progress bar ---------- */
.sx-progress {
  position: fixed; top: 0; left: 0; right: 0;
  height: 2px; z-index: 9998;
  background: rgba(79, 200, 255, 0.06);
  pointer-events: none;
}
.sx-progress > i {
  display: block; height: 100%;
  width: var(--sx-progress, 0%);
  background: linear-gradient(90deg, #4FC8FF 0%, #ffffff 50%, #5EFFA4 100%);
  box-shadow: 0 0 14px rgba(79, 200, 255, 0.7), 0 0 4px rgba(255,255,255,0.6);
  transform-origin: left center;
  transition: width 80ms linear;
}
.sx-progress::after {
  content: "";
  position: absolute; top: 0; bottom: 0;
  left: var(--sx-progress, 0%);
  width: 24px;
  background: radial-gradient(circle at left, rgba(255,255,255,0.55), transparent 70%);
  pointer-events: none;
  opacity: 0.7;
}

/* ---------- Right-side scroll meter ---------- */
.sx-meter {
  position: fixed;
  top: 50%; right: 18px;
  transform: translateY(-50%);
  z-index: 9997;
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  font-size: 9px; letter-spacing: 0.22em; text-transform: uppercase;
  color: rgba(207, 214, 232, 0.55);
  pointer-events: none;
  opacity: 0;
  transition: opacity 320ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.sx-meter.visible { opacity: 1; }
.sx-meter-track {
  position: relative;
  width: 1px; height: 200px;
  background: linear-gradient(180deg, transparent, rgba(79,200,255,0.20) 12%, rgba(79,200,255,0.20) 88%, transparent);
}
.sx-meter-thumb {
  position: absolute; left: -3px; width: 7px; height: 14px;
  background: #4FC8FF;
  box-shadow: 0 0 10px rgba(79, 200, 255, 0.85), 0 0 20px rgba(79, 200, 255, 0.45);
  top: var(--sx-thumb, 0%);
  transition: top 80ms linear;
}
.sx-meter-thumb::before, .sx-meter-thumb::after {
  content: ""; position: absolute; top: 50%; transform: translateY(-50%);
  width: 8px; height: 1px; background: #4FC8FF; box-shadow: 0 0 4px #4FC8FF;
}
.sx-meter-thumb::before { right: 100%; margin-right: 4px; }
.sx-meter-thumb::after  { left: 100%; margin-left: 4px; }
.sx-meter-pct {
  font-variant-numeric: tabular-nums;
  color: #fff;
  font-size: 11px;
  letter-spacing: 0.16em;
}
.sx-meter-pct b { color: #4FC8FF; font-weight: 600; }
.sx-meter-vel {
  font-size: 8px;
  color: rgba(94, 255, 164, 0.7);
  font-variant-numeric: tabular-nums;
  min-height: 11px;
}

/* ---------- Section ticker (top-center, brief readout on section change) ---------- */
.sx-ticker {
  position: fixed; top: 14px; left: 50%;
  transform: translate(-50%, -120%);
  z-index: 9997;
  display: inline-flex; align-items: center; gap: 14px;
  padding: 8px 16px;
  font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  font-size: 10px; letter-spacing: 0.26em; text-transform: uppercase;
  color: #fff;
  background: rgba(4, 6, 15, 0.92);
  border: 1px solid rgba(79, 200, 255, 0.35);
  box-shadow: 0 0 24px rgba(0, 85, 255, 0.25);
  backdrop-filter: blur(6px);
  pointer-events: none;
  opacity: 0;
  transition: opacity 280ms ease, transform 360ms cubic-bezier(0.16, 1, 0.3, 1);
}
.sx-ticker.visible {
  opacity: 1;
  transform: translate(-50%, 0);
}
.sx-ticker .dot {
  width: 6px; height: 6px; background: #5EFFA4; border-radius: 50%;
  box-shadow: 0 0 8px #5EFFA4;
  animation: sx-pulse 1.2s ease-in-out infinite;
}
.sx-ticker .idx {
  color: #4FC8FF;
  font-variant-numeric: tabular-nums;
}
.sx-ticker .label {
  color: rgba(207, 214, 232, 0.95);
}
@keyframes sx-pulse { 0%, 100% { opacity: 1 } 50% { opacity: 0.35 } }

/* ---------- Scroll-direction scanline flash ---------- */
.sx-flash {
  position: fixed; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, #4FC8FF 50%, transparent);
  box-shadow: 0 0 16px rgba(79, 200, 255, 0.85);
  z-index: 9996;
  pointer-events: none;
  opacity: 0;
  top: 50%;
}
.sx-flash.fire {
  animation: sx-flash-fire 360ms cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}
@keyframes sx-flash-fire {
  0%   { opacity: 0; top: 0%; }
  20%  { opacity: 0.9; }
  100% { opacity: 0; top: 100%; }
}

/* ---------- Reveal on scroll ---------- */
[data-sx-reveal] {
  opacity: 0;
  transform: translate3d(0, 18px, 0);
  filter: blur(6px);
  transition:
    opacity 700ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 700ms cubic-bezier(0.16, 1, 0.3, 1),
    filter 600ms cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform, filter;
}
[data-sx-reveal].sx-in {
  opacity: 1;
  transform: translate3d(0, 0, 0);
  filter: blur(0);
}
/* variants */
[data-sx-reveal="left"]  { transform: translate3d(-22px, 0, 0); }
[data-sx-reveal="right"] { transform: translate3d(22px, 0, 0); }
[data-sx-reveal="zoom"]  { transform: scale(0.96); }
[data-sx-reveal="left"].sx-in,
[data-sx-reveal="right"].sx-in { transform: translate3d(0, 0, 0); }
[data-sx-reveal="zoom"].sx-in  { transform: scale(1); }

/* Stagger children */
[data-sx-stagger] > * {
  opacity: 0;
  transform: translate3d(0, 14px, 0);
  filter: blur(4px);
  transition:
    opacity 600ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 600ms cubic-bezier(0.16, 1, 0.3, 1),
    filter 500ms cubic-bezier(0.16, 1, 0.3, 1);
}
[data-sx-stagger].sx-in > * {
  opacity: 1;
  transform: translate3d(0, 0, 0);
  filter: blur(0);
}
[data-sx-stagger].sx-in > *:nth-child(1)  { transition-delay:  40ms; }
[data-sx-stagger].sx-in > *:nth-child(2)  { transition-delay:  90ms; }
[data-sx-stagger].sx-in > *:nth-child(3)  { transition-delay: 140ms; }
[data-sx-stagger].sx-in > *:nth-child(4)  { transition-delay: 190ms; }
[data-sx-stagger].sx-in > *:nth-child(5)  { transition-delay: 240ms; }
[data-sx-stagger].sx-in > *:nth-child(6)  { transition-delay: 290ms; }
[data-sx-stagger].sx-in > *:nth-child(7)  { transition-delay: 340ms; }
[data-sx-stagger].sx-in > *:nth-child(8)  { transition-delay: 380ms; }
[data-sx-stagger].sx-in > *:nth-child(9)  { transition-delay: 420ms; }
[data-sx-stagger].sx-in > *:nth-child(n+10) { transition-delay: 460ms; }

/* Auto-reveal heuristic — applied via JS to top-level sections */
.sx-auto-reveal {
  opacity: 0;
  transform: translate3d(0, 22px, 0);
  filter: blur(6px);
  transition:
    opacity 760ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 760ms cubic-bezier(0.16, 1, 0.3, 1),
    filter 600ms cubic-bezier(0.16, 1, 0.3, 1);
}
.sx-auto-reveal.sx-in {
  opacity: 1;
  transform: translate3d(0, 0, 0);
  filter: blur(0);
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .sx-flash { display: none; }
  .sx-meter { display: none; }
  [data-sx-reveal], [data-sx-stagger] > *, .sx-auto-reveal {
    opacity: 1 !important;
    transform: none !important;
    filter: none !important;
  }
}

/* ---------- Hide on print ---------- */
@media print {
  .sx-progress, .sx-meter, .sx-ticker, .sx-flash { display: none !important; }
}

/* ---------- Hide right-side meter on mobile (it crowds narrow viewports) ---------- */
@media (max-width: 768px) {
  .sx-meter { display: none !important; }
}