/*
 * MARO Product Grid Slider — slider.css
 * Ultra-performance: GPU-composited transforms, no repaints on scroll.
 * CSS Scroll Snap handles all animation — zero JS for visual transitions.
 */

/* ─── Link wrapper ──────────────────────────────────────────────────────── */

.mpgs__link {
  display: block;
  text-decoration: none;
  /* Dziedziczy wymiary od .mpgs */
}

.mpgs__link:focus-visible {
  outline: 2px solid #005fcc;
  outline-offset: 2px;
}

/* ─── Container ─────────────────────────────────────────────────────────── */

.mpgs {
  position: relative;
  overflow: hidden;
  aspect-ratio: var(--mpgs-ratio, 1 / 1);
  background: #f5f5f5;
  border-radius: var(--mpgs-radius, 0px);
  /* Brak cursor: grab — .mpgs jest wewnątrz <a>, kursor musi być pointer
     żeby użytkownik wiedział że można kliknąć i przejść do produktu. */
  cursor: pointer;
}

/* ─── Track (scroll container) ──────────────────────────────────────────── */

.mpgs__track {
  display: flex;
  width: 100%;
  height: 100%;

  /* CSS Scroll Snap — GPU-accelerated, no JS needed for animation */
  overflow-x: scroll;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;

  /* Hide scrollbar everywhere */
  scrollbar-width: none;           /* Firefox */
  -ms-overflow-style: none;        /* IE/Edge */

  /* Smooth programmatic scrolling (arrow buttons) */
  scroll-behavior: smooth;

  /* Prevent scroll from bubbling to page (important on mobile) */
  overscroll-behavior-x: contain;
}

.mpgs__track::-webkit-scrollbar {
  display: none; /* Chrome/Safari */
}

/* ─── Slides ─────────────────────────────────────────────────────────────── */

.mpgs__slide {
  flex: 0 0 100%;
  width: 100%;
  height: 100%;
  scroll-snap-align: start;
  scroll-snap-stop: always;  /* Prevent fast-swipe from skipping slides */
  position: relative;
  overflow: hidden;
}

/* ─── Images ─────────────────────────────────────────────────────────────── */

.mpgs__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;

  /* Fade-in when lazy-loaded. Runs on GPU (opacity transition). */
  opacity: 0;
  transition: opacity 0.25s ease;

  /* Hint browser for decode priority */
  will-change: opacity;
}

.mpgs__img--loaded {
  opacity: 1;
}

/* ─── Navigation buttons ────────────────────────────────────────────────── */

.mpgs__btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;

  display: flex;
  align-items: center;
  justify-content: center;

  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  border-radius: 50%;

  background: rgba(255, 255, 255, 0.88);
  color: #1a1a1a;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.18);
  cursor: pointer;

  /* Hidden by default, shown on hover/focus */
  opacity: 0;
  pointer-events: none;

  /* GPU-composited — no repaints */
  transition: opacity 0.18s ease, background 0.18s ease;

  /* Focus visible */
  outline: 2px solid transparent;
  outline-offset: 2px;
}

.mpgs__btn--prev { left: 8px; }
.mpgs__btn--next { right: 8px; }

/* Show on container hover (desktop) */
.mpgs:hover .mpgs__btn,
.mpgs:focus-within .mpgs__btn {
  opacity: 1;
  pointer-events: auto;
}

.mpgs__btn:hover {
  background: rgba(255, 255, 255, 1);
}

/* WCAG focus-visible */
.mpgs__btn:focus-visible {
  outline: 2px solid #005fcc;
  outline-offset: 2px;
}

/* Hide prev on first slide, next on last slide */
.mpgs[data-current="0"] .mpgs__btn--prev {
  opacity: 0 !important;
  pointer-events: none !important;
}

.mpgs.mpgs--last .mpgs__btn--next {
  opacity: 0 !important;
  pointer-events: none !important;
}

/* ─── Progress bar ──────────────────────────────────────────────────────── */

.mpgs__bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 2;
  height: 2px;
  background: rgba(255, 255, 255, 0.25);
  pointer-events: none;
  overflow: hidden;
}

.mpgs__bar-fill {
  display: block;
  height: 100%;
  background: rgba(255, 255, 255, 0.9);
  transform-origin: left center;
  /* Startujemy od 1/N szerokości — ustawiane inline przez JS */
  transform: scaleX(0);
  /* Płynna animacja podczas scroll snap */
  transition: transform 0.15s ease;
}

@media (prefers-reduced-motion: reduce) {
  .mpgs__bar-fill {
    transition: none;
  }
}

/* ─── Reduced motion — respect OS setting ───────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  .mpgs__track {
    scroll-behavior: auto;
  }
  .mpgs__img {
    transition: none;
  }
  .mpgs__btn {
    transition: none;
  }
  .mpgs__dot {
    transition: none;
  }
}

/* ─── Touch devices: always show buttons slightly ───────────────────────── */

@media (hover: none) and (pointer: coarse) {
  /* On mobile, user swipes naturally — hide buttons. Show only dots. */
  .mpgs__btn {
    display: none;
  }
}