/* ============================ */
/* === HEAD BACK SLIDER ======= */
/* ============================ */

.stage{
  position: relative;
  width: 100%;
  height: 100svh;            /* more reliable on mobile UI chrome */
  overflow: hidden;
  perspective: 1000px;       /* 3D depth for caption effect */
  isolation: isolate;        /* contain z-index layers */
}

/* Frame states */
.frame{
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--fade-duration) ease-in-out;
  z-index: 0;
}
.frame.active{ opacity: 1; z-index: 1; }

/* Slide image */
.slide{
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transform: scale(1);
  transition: transform 6s ease;
}
.frame.active .slide{ transform: scale(var(--zoom-scale)); }

/* Overlay above image, below caption */
.overlay{
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,var(--overlay-darkness));
  opacity: 1;
  transition: opacity 300ms ease;
  z-index: 1;
  pointer-events: none;
}

/* Caption */
.caption{
  position: absolute;
  top: var(--caption-top);
  left: 50%;
  width: min(100%, var(--caption-max-w));
  transform: translate(-50%, var(--caption-rise));
  transform-style: preserve-3d;
  text-align: center;
  color: #fff;
  opacity: 0;
  transition: transform .15s ease-out, opacity 1.2s ease;
  z-index: 2;
}
.frame.active .caption{
  opacity: 1;
  transform: translate(-50%, 0);
}

.caption h1{
  font-size: 6rem;
  margin-top: 2rem;
  letter-spacing: 1px;
  text-shadow: var(--text-outline);
}
.caption p{
  font-style: italic;
  font-size: 2rem;
  letter-spacing: .5px;
  margin-top: 1.5rem;
  color: white; /* rgba(218,165,32,1) */
  text-shadow: var(--text-outline);
}
.caption a.slide-link{
  display: inline-block;
  margin-top: 2rem;
  padding: .8rem 1.6rem;
  font-weight: 700;
  color: white;
  font-style: italic;
  text-decoration: none;
  background: var(--link-bg);
  border: 2px solid white;
  border-radius: 6px;
  transition: background .3s ease, transform .2s ease;
}
.caption a.slide-link:hover{
  background: var(--link-bg-hover);
}

/* Slider buttons */
.slide-btn{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 5;
  background: var(--btn-bg);
  color: #fff;
  border: 0;
  font-size: 2.2rem;
  padding: .4rem .8rem;
  cursor: pointer;
  border-radius: var(--btn-radius);
  transition: background .3s ease, transform .2s ease;
}
.slide-btn:hover{ background: var(--btn-bg-hover); }
.slide-btn.prev{ left: 20px; }
.slide-btn.next{ right: 20px; }

/* ============================ */
/* ======= RESPONSIVE ========= */
/* ============================ */

@media (max-width: 800px){
  .caption h1{ font-size: 3.25rem; }
  .caption p{ font-size: 1.5rem; }
  .slide-btn{ font-size: 1.6rem; padding: .3em .5em; }
}

/* ============================ */
/* ==== REDUCED MOTION ======== */
/* ============================ */
@media (prefers-reduced-motion: reduce){
  .frame, .slide, .caption { transition: none !important; }
  .frame.active .slide { transform: none !important; }
}