/* ==========================================================================
   FLUX PRIME — hero-slider.css
   WebGL hero slider. Sits as a 100vh section, not a fixed overlay.
   Requires: base.css, js/hero-slider.js (GSAP + Three.js)
   ========================================================================== */

.hero-slider {
  position: relative;
  width: 100%;
  height: 100svh;
  min-height: 560px;
  max-height: 1100px;
  overflow: hidden;
  background: var(--color-bg);
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out);
}
.hero-slider.loaded { opacity: 1; }

.webgl-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* Non-WebGL crossfade layers (see initFallback in js/hero-slider.js) */
.hero-fallback {
  position: absolute;
  inset: 0;
  overflow: hidden;
}
.hero-fallback__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  will-change: opacity, transform;
}

/* Readability scrim over the WebGL layer. */
.hero-slider::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    /* keeps the header and slide counter legible over a bright frame */
    linear-gradient(to bottom, rgba(10,10,10,0.6) 0%, rgba(10,10,10,0.26) 13%, rgba(10,10,10,0) 27%),
    linear-gradient(to top, rgba(10,10,10,0.94) 0%, rgba(10,10,10,0.74) 22%, rgba(10,10,10,0.36) 44%, rgba(10,10,10,0) 68%),
    radial-gradient(120% 90% at 50% 45%, rgba(10,10,10,0) 40%, rgba(10,10,10,0.55) 100%);
}

/* --------------------------------------------------------------------------
   Counter
   -------------------------------------------------------------------------- */
.slide-number,
.slide-total {
  position: absolute;
  z-index: 3;
  font-family: var(--font-head);
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1;
  user-select: none;
  top: calc(var(--header-h) + var(--announce-h) + clamp(1.25rem, 3vh, 2.25rem));
}
.slide-number {
  left: var(--gutter);
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  color: var(--color-text);
}
.slide-number::after {
  content: "";
  position: absolute;
  left: calc(100% + 0.55rem);
  top: 50%;
  width: clamp(18px, 2vw, 30px);
  height: 1px;
  background: var(--color-border-strong);
}
.slide-total {
  left: calc(var(--gutter) + clamp(18px, 2vw, 30px) + 3.4rem);
  font-size: 0.75rem;
  color: var(--color-text-light);
  padding-top: 0.35em;
}

/* --------------------------------------------------------------------------
   Content
   -------------------------------------------------------------------------- */
.slide-content {
  position: absolute;
  z-index: 3;
  left: var(--gutter);
  bottom: clamp(3rem, 10vh, 6rem);
  max-width: min(640px, 54vw);
}
.slide-title {
  margin: 0 0 var(--space-4);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--text-4xl);
  line-height: 1.02;
  letter-spacing: -0.015em;
  perspective: 800px;
  transform-style: preserve-3d;
}
.slide-title span { will-change: transform, opacity, filter; }

.slide-description {
  max-width: 46ch;
  font-size: var(--text-base);
  font-weight: 300;
  color: var(--color-text-muted);
}

.slide-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

/* --------------------------------------------------------------------------
   Slide navigation
   -------------------------------------------------------------------------- */
.slides-navigation {
  position: absolute;
  z-index: 4;
  right: var(--gutter);
  bottom: clamp(3rem, 10vh, 6rem);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  width: clamp(150px, 16vw, 215px);
}
.slide-nav-item {
  cursor: pointer;
  opacity: 0.45;
  transition: opacity var(--dur-mid) var(--ease-out);
}
.slide-nav-item:hover { opacity: 0.85; }
.slide-nav-item.active { opacity: 1; }

.slide-progress-line {
  position: relative;
  width: 100%;
  height: 1px;
  background: var(--color-border-strong);
  overflow: hidden;
}
.slide-progress-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  background: var(--color-accent);
  opacity: 0;
  transition: width 0.1s linear, opacity var(--dur-mid) ease;
}
.slide-nav-title {
  margin-top: 0.55rem;
  font-family: var(--font-head);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.005em;
  color: var(--color-text-light);
  transition: color var(--dur-mid) var(--ease-out);
}
.slide-nav-item.active .slide-nav-title { color: var(--color-text); }

/* --------------------------------------------------------------------------
   Scroll cue
   -------------------------------------------------------------------------- */
.scroll-cue {
  position: absolute;
  z-index: 3;
  left: 50%;
  translate: -50% 0;
  bottom: var(--space-5);
  display: grid;
  justify-items: center;
  gap: var(--space-2);
  font-family: var(--font-head);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-faint);
}
.scroll-cue__rail {
  width: 1px;
  height: 42px;
  background: var(--color-border-strong);
  overflow: hidden;
}
.scroll-cue__rail::after {
  content: "";
  display: block;
  width: 100%;
  height: 40%;
  background: var(--color-accent);
  animation: scroll-cue 2.2s var(--ease-in-out) infinite;
}
@keyframes scroll-cue {
  0%   { transform: translateY(-100%); }
  60%  { transform: translateY(250%); }
  100% { transform: translateY(250%); }
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  .slide-content {
    right: var(--gutter);
    max-width: none;
    bottom: clamp(6rem, 18vh, 9rem);
  }
  .slides-navigation {
    left: var(--gutter);
    right: var(--gutter);
    bottom: clamp(1.75rem, 5vh, 2.5rem);
    width: auto;
    flex-direction: row;
    gap: var(--space-2);
  }
  .slide-nav-item { flex: 1; }
  .slide-nav-title { display: none; }
  .scroll-cue { display: none; }
}