fix(a11y): reconcile responsive layouts and multilingual UI

www/src/components/ImageCarousel.astro

@@ -0,0 +1,93 @@
+---
+interface Slide { src: string; alt: string; caption: string }
+interface Props { id: string; label: string; slides: Slide[] }
+const { id, label, slides } = Astro.props;
+---
+<section class="image-carousel" id={id} aria-label={label} data-image-carousel>
+  <div class="image-carousel__stage">
+    {slides.map((slide, index) => (
+      <figure id={`${id}-slide-${index + 1}`} data-slide>
+        <img src={slide.src} alt={slide.alt} width="948" height="534" loading={index === 0 ? 'eager' : 'lazy'} />
+        <figcaption>{slide.caption}</figcaption>
+      </figure>
+    ))}
+    <div data-carousel-controls hidden>
+      <button class="image-carousel__previous" type="button" aria-label="Previous slide" data-previous><span aria-hidden="true">❮</span></button>
+      <button class="image-carousel__next" type="button" aria-label="Next slide" data-next><span aria-hidden="true">❯</span></button>
+    </div>
+  </div>
+  <div data-carousel-controls hidden>
+    <div class="image-carousel__thumbnails" role="group" aria-label="Choose a tour photo">
+      {slides.map((slide, index) => (
+        <button type="button" data-thumbnail aria-label={`Show photo ${index + 1}: ${slide.caption}`} aria-controls={`${id}-slide-${index + 1}`}>
+          <img src={slide.src} alt="" width="80" height="80" loading="lazy" />
+        </button>
+      ))}
+    </div>
+    <p class="sr-only" data-carousel-status role="status" aria-atomic="true"></p>
+  </div>
+</section>
+
+<script>
+  document.querySelectorAll<HTMLElement>('[data-image-carousel]').forEach(carousel => {
+    const slides = [...carousel.querySelectorAll<HTMLElement>('[data-slide]')];
+    const thumbnails = [...carousel.querySelectorAll<HTMLButtonElement>('[data-thumbnail]')];
+    const status = carousel.querySelector<HTMLElement>('[data-carousel-status]')!;
+    let current = 0;
+    const show = (index: number, announce = true) => {
+      current = (index + slides.length) % slides.length;
+      slides.forEach((slide, i) => {
+        slide.hidden = i !== current;
+        thumbnails[i].setAttribute('aria-pressed', String(i === current));
+      });
+      if (announce) status.textContent = `Photo ${current + 1} of ${slides.length}: ${slides[current].querySelector('figcaption')?.textContent}`;
+    };
+    slides.forEach((slide, index) => {
+      slide.setAttribute('role', 'group');
+      slide.setAttribute('aria-roledescription', 'slide');
+      slide.setAttribute('aria-label', `${index + 1} of ${slides.length}`);
+    });
+    carousel.setAttribute('aria-roledescription', 'carousel');
+    carousel.querySelector('[data-previous]')!.addEventListener('click', () => show(current - 1));
+    carousel.querySelector('[data-next]')!.addEventListener('click', () => show(current + 1));
+    thumbnails.forEach((button, index) => button.addEventListener('click', () => show(index)));
+    carousel.addEventListener('keydown', event => {
+      if (!(event.target instanceof HTMLButtonElement)) return;
+      if (event.key === 'ArrowRight' || event.key === 'ArrowLeft') {
+        event.preventDefault(); show(current + (event.key === 'ArrowRight' ? 1 : -1));
+      }
+    });
+    show(0, false);
+    carousel.dataset.enhanced = 'true';
+    carousel.querySelectorAll<HTMLElement>('[data-carousel-controls]').forEach(control => control.hidden = false);
+  });
+</script>
+
+<style>
+  .image-carousel { max-width: 1000px; margin: 2rem auto; }
+  .image-carousel__stage { position: relative; }
+  .image-carousel [data-carousel-status] { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
+  .image-carousel figure { position: relative; margin: 0 0 2rem; }
+  .image-carousel [hidden] { display: none !important; }
+  .image-carousel figure img { display: block; width: 100%; height: auto; margin: 0; }
+  .image-carousel figcaption { margin: 0; padding: .5rem .75rem; background: var(--color-primary); color: white; text-align: center; font-size: 1rem; line-height: 1.4; }
+  .image-carousel[data-enhanced] figure { margin-bottom: 1rem; }
+  .image-carousel[data-enhanced] figcaption { position: absolute; bottom: 0; width: 100%; background: rgb(37 64 128 / 90%); }
+  .image-carousel button { cursor: pointer; }
+  .image-carousel__previous, .image-carousel__next { position: absolute; top: 50%; transform: translateY(-50%); min-width: 44px; min-height: 44px; padding: 1rem; border: 0; background: rgb(255 255 255 / 95%); color: var(--color-primary); font-size: 2rem; line-height: 1; border-radius: 3px; }
+  .image-carousel__previous { left: 0; }
+  .image-carousel__next { right: 0; }
+  .image-carousel__previous:hover, .image-carousel__next:hover { background: var(--color-primary); color: white; }
+  .image-carousel button:focus-visible { outline: 3px solid var(--color-primary); outline-offset: 3px; box-shadow: 0 0 0 6px white; }
+  .image-carousel__thumbnails { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; padding: 6px; }
+  .image-carousel__thumbnails button { padding: 2px; border: 3px solid transparent; background: white; border-radius: 0; }
+  .image-carousel__thumbnails img { display: block; width: 80px; height: 80px; object-fit: cover; margin: 0; opacity: .6; }
+  .image-carousel__thumbnails button[aria-pressed="true"] { border-color: var(--color-primary); }
+  .image-carousel__thumbnails button:is(:hover, [aria-pressed="true"]) img { opacity: 1; }
+  @media (max-width: 479px) {
+    .image-carousel__previous, .image-carousel__next { padding: .75rem; font-size: 1rem; }
+    .image-carousel[data-enhanced] figcaption { position: static; font-size: .875rem; }
+    .image-carousel__previous, .image-carousel__next { top: 30%; }
+  }
+  /* No automatic rotation or animation: reduced-motion users get the same stable slides. */
+</style>