Filmszalag-hatású, mozgó fotógaléria

.we-film {
  --film-gold: #d8bd83;
  --film-bg: #0b1511;
  --film-card-width: clamp(230px, 36vw, 390px);
  --film-gap: clamp(14px, 2.5vw, 28px);

  position: relative;
  width: 100%;
  padding: clamp(28px, 5vw, 64px) 0 30px;
  overflow: hidden;
  color: #f6f2e9;
  background:
    radial-gradient(ellipse at 50% 42%, #294638 0%, transparent 55%),
    var(--film-bg);
  border: 1px solid rgba(216, 189, 131, .2);
  border-radius: 24px;
  font-family: Georgia, "Times New Roman", serif;
  box-sizing: border-box;
}

.we-film *,
.we-film *::before,
.we-film *::after {
  box-sizing: border-box;
}

.we-film__header {
  position: relative;
  z-index: 2;
  padding: 0 20px;
  margin: 0 auto 36px;
  text-align: center;
}

.we-film__eyebrow {
  color: var(--film-gold);
  font: 700 10px/1.5 Arial, sans-serif;
  letter-spacing: .24em;
}

.we-film__header h2 {
  margin: 14px 0 10px;
  font-size: clamp(32px, 5vw, 55px);
  line-height: 1.08;
  font-weight: 400;
  letter-spacing: -.035em;
}

.we-film__header h2 em {
  color: var(--film-gold);
  font-weight: 400;
}

.we-film__header p {
  margin: 0;
  color: #aebbb1;
  font: 14px/1.7 Arial, sans-serif;
}

.we-film__stage {
  position: relative;
  height: clamp(330px, 48vw, 510px);
  overflow: hidden;
  isolation: isolate;
}

.we-film__track {
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  gap: var(--film-gap);
  height: 100%;
  padding: 0;
  will-change: transform;
  transition: transform .7s cubic-bezier(.22, .75, .25, 1);
}

.we-film__card {
  position: relative;
  flex: 0 0 var(--film-card-width);
  height: 84%;
  overflow: hidden;
  background: #20372b;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 13px;
  opacity: .48;
  transform: scale(.84);
  transition:
    opacity .65s ease,
    transform .65s cubic-bezier(.2, .7, .2, 1),
    border-color .65s ease,
    box-shadow .65s ease;
}

.we-film__card.is-active {
  z-index: 1;
  opacity: 1;
  transform: scale(1);
  border-color: rgba(216, 189, 131, .8);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .35);
}

.we-film__card img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1s ease;
}

.we-film__card.is-active:hover img {
  transform: scale(1.045);
}

.we-film__card::after {
  content: "";
  position: absolute;
  inset: 20% 0 0;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(5, 12, 8, .15) 30%,
    rgba(5, 12, 8, .88) 100%
  );
  pointer-events: none;
}

.we-film__caption {
  position: absolute;
  z-index: 1;
  right: 22px;
  bottom: 25px;
  left: 22px;
  transform: translateY(8px);
  transition: transform .6s ease;
}

.we-film__card.is-active .we-film__caption {
  transform: translateY(0);
}

.we-film__caption span {
  color: var(--film-gold);
  font: 700 10px/1.5 Arial, sans-serif;
  letter-spacing: .16em;
}

.we-film__caption h3 {
  margin: 8px 0 0;
  color: #fff;
  font-size: clamp(22px, 3vw, 31px);
  line-height: 1.15;
  font-weight: 400;
}

.we-film__nav {
  position: absolute;
  z-index: 3;
  top: 50%;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  padding: 0 0 4px;
  color: #fff;
  background: rgba(10, 22, 15, .76);
  border: 1px solid rgba(216, 189, 131, .7);
  border-radius: 50%;
  font: 32px/1 Arial, sans-serif;
  cursor: pointer;
  transform: translateY(-50%);
  transition: color .2s ease, background .2s ease, scale .2s ease;
}

.we-film__nav:hover {
  color: var(--film-bg);
  background: var(--film-gold);
  scale: 1.07;
}

.we-film__nav:focus-visible,
.we-film__dots button:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 4px;
}

.we-film__nav--prev {
  left: 16px;
}

.we-film__nav--next {
  right: 16px;
}

.we-film__footer {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 22px;
  padding: 26px clamp(18px, 5vw, 55px) 0;
}

.we-film__progress {
  height: 2px;
  overflow: hidden;
  background: rgba(255, 255, 255, .15);
}

.we-film__progress span {
  display: block;
  width: 20%;
  height: 100%;
  background: var(--film-gold);
  transition: width .5s ease;
}

.we-film__status {
  display: flex;
  align-items: center;
  gap: 7px;
  color: #8d9b90;
  font: 11px/1 Arial, sans-serif;
  font-variant-numeric: tabular-nums;
}

.we-film__number {
  color: var(--film-gold);
  font-size: 16px;
}

.we-film__separator {
  color: #66776b;
}

.we-film__dots {
  display: flex;
  align-items: center;
  gap: 7px;
}

.we-film__dots button {
  width: 7px;
  height: 7px;
  padding: 0;
  background: #627166;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  transition: width .3s ease, background .3s ease;
}

.we-film__dots button.is-active {
  width: 23px;
  background: var(--film-gold);
  border-radius: 8px;
}

@media (max-width: 600px) {
  .we-film {
    --film-card-width: 76vw;
    --film-gap: 12px;
    border-radius: 16px;
  }

  .we-film__header {
    margin-bottom: 25px;
  }

  .we-film__stage {
    height: 390px;
  }

  .we-film__card {
    height: 88%;
    border-radius: 10px;
  }

  .we-film__caption {
    right: 16px;
    bottom: 19px;
    left: 16px;
  }

  .we-film__nav {
    width: 38px;
    height: 38px;
    font-size: 27px;
  }

  .we-film__nav--prev {
    left: 8px;
  }

  .we-film__nav--next {
    right: 8px;
  }

  .we-film__footer {
    grid-template-columns: 1fr auto;
    gap: 14px;
    padding: 22px 16px 0;
  }

  .we-film__dots {
    grid-column: 1 / -1;
    justify-content: center;
    padding-top: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .we-film *,
  .we-film *::before,
  .we-film *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}

document.querySelectorAll("[data-film-gallery]").forEach((gallery) => {
  const stage = gallery.querySelector(".we-film__stage");
  const track = gallery.querySelector("[data-film-track]");
  const cards = Array.from(track.querySelectorAll(".we-film__card"));
  const prev = gallery.querySelector("[data-film-prev]");
  const next = gallery.querySelector("[data-film-next]");
  const number = gallery.querySelector("[data-film-number]");
  const total = gallery.querySelector("[data-film-total]");
  const progress = gallery.querySelector("[data-film-progress]");
  const dotsContainer = gallery.querySelector("[data-film-dots]");

  if (!stage || !track || !cards.length) return;

  let activeIndex = 0;

  total.textContent = String(cards.length).padStart(2, "0");
  dotsContainer.replaceChildren();

  const dots = cards.map((card, index) => {
    const dot = document.createElement("button");
    dot.type = "button";
    dot.setAttribute("aria-label", `Fotó ${index + 1}`);
    dot.addEventListener("click", () => showCard(index));
    dotsContainer.appendChild(dot);
    return dot;
  });

  function showCard(index) {
    activeIndex = (index + cards.length) % cards.length;

    cards.forEach((card, i) => {
      const active = i === activeIndex;
      card.classList.toggle("is-active", active);
      card.setAttribute("aria-current", active ? "true" : "false");
    });

    dots.forEach((dot, i) => {
      const active = i === activeIndex;
      dot.classList.toggle("is-active", active);

      if (active) {
        dot.setAttribute("aria-current", "true");
      } else {
        dot.removeAttribute("aria-current");
      }
    });

    number.textContent = String(activeIndex + 1).padStart(2, "0");
    progress.style.width =
      `${((activeIndex + 1) / cards.length) * 100}%`;

    const card = cards[activeIndex];
    const centerOffset =
      stage.clientWidth / 2 -
      (card.offsetLeft + card.offsetWidth / 2);

    track.style.transform = `translateX(${centerOffset}px)`;
  }

  prev.addEventListener("click", () => showCard(activeIndex - 1));
  next.addEventListener("click", () => showCard(activeIndex + 1));

  // A fotóra kattintva az adott kép kerül középre.
  cards.forEach((card, index) => {
    card.addEventListener("click", () => showCard(index));
  });

  // Billentyűzetes léptetés, ha a galéria kapja a fókuszt.
  gallery.tabIndex = 0;

  gallery.addEventListener("keydown", (event) => {
    if (event.key === "ArrowLeft") {
      event.preventDefault();
      showCard(activeIndex - 1);
    }

    if (event.key === "ArrowRight") {
      event.preventDefault();
      showCard(activeIndex + 1);
    }
  });

  // Újraközépre igazítás átméretezéskor.
  if ("ResizeObserver" in window) {
    const observer = new ResizeObserver(() => showCard(activeIndex));
    observer.observe(stage);
  } else {
    window.addEventListener("resize", () => showCard(activeIndex));
  }

  showCard(0);
});