prototype pour l'animation galerie d'images dans test_anim à la récine

test_anim/style.css

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+* { margin: 0; padding: 0; box-sizing: border-box; }
+body {
+  min-height: 100vh;
+}
+.gallery-animation {
+  --gap: 40px;
+  --vertical-wrapper-width: 900px;
+  --shadow-diffusion: 10px;
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 40vw;
+  height: 100vh;
+    overflow: hidden;
+}
+
+.gallery-animation__wrapper {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  display: flex;
+}
+
+.gallery-animation__track {
+  display: flex;
+  animation-timing-function: linear;
+  animation-iteration-count: infinite;
+}
+
+.gallery-animation__image {
+  object-fit: cover;
+  flex-shrink: 0;
+  filter: drop-shadow(0px 0px var(--shadow-diffusion) rgb(0, 0, 0));
+}
+
+/* ==========================================================================
+   MODE VERTICAL
+   ========================================================================== */
+
+.gallery-animation--vertical .gallery-animation__wrapper{
+  width: var(--vertical-wrapper-width);
+  flex-direction: row;
+  justify-content: center;
+  padding: 0 var(--gap);
+  left: 50%;
+  transform: translateX(-50%);
+}
+
+.gallery-animation--vertical .gallery-animation__column {
+  width: 100%;
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  overflow: hidden;
+}
+
+.gallery-animation--vertical .gallery-animation__track {
+  flex-direction: column;
+  align-items: stretch;
+  width: 100%;
+  padding-inline: calc(var(--gap) / 2);
+}
+
+.gallery-animation--vertical .gallery-animation__image {
+  width: 100%;
+  height: auto;
+  object-fit: contain;
+  margin-block: calc(var(--gap) / 2);
+}
+
+/* Animations verticales */
+.gallery-animation--vertical .gallery-animation__column:nth-child(odd) .gallery-animation__track {
+  animation: scrollDown var(--animation-duration) linear infinite;
+}
+
+.gallery-animation--vertical .gallery-animation__column:nth-child(even) .gallery-animation__track {
+  animation: scrollUp var(--animation-duration) linear infinite;
+}
+
+
+@keyframes scrollDown {
+  from { transform: translateY(0); }
+  to { transform: translateY(-50%); }
+}
+
+@keyframes scrollUp {
+  from { transform: translateY(-50%); }
+  to { transform: translateY(0); }
+}
+
+/* ==========================================================================
+   MODE HORIZONTAL
+   ========================================================================== */
+
+.gallery-animation--horizontal .gallery-animation__wrapper {
+  flex-direction: column;
+  padding: var(--gap) 0;
+}
+
+.gallery-animation--horizontal .gallery-animation__column {
+  flex: 1;
+  display: flex;
+  flex-direction: row;
+  align-items: stretch;
+  overflow: hidden;
+}
+
+.gallery-animation--horizontal .gallery-animation__track {
+  flex-direction: row;
+  align-items: stretch;
+  height: 100%;
+  padding-block: calc(var(--gap) / 2);
+}
+
+.gallery-animation--horizontal .gallery-animation__image {
+  height: 100%;
+  width: auto;
+  object-fit: contain;
+  margin-inline: calc(var(--gap) / 2);
+}
+
+/* Animations horizontales */
+.gallery-animation--horizontal .gallery-animation__column:nth-child(odd) .gallery-animation__track {
+  animation: scrollRight var(--animation-duration) linear infinite;
+}
+
+.gallery-animation--horizontal .gallery-animation__column:nth-child(even) .gallery-animation__track {
+  animation: scrollLeft var(--animation-duration) linear infinite;
+}
+
+
+@keyframes scrollRight {
+  from { transform: translateX(-50%); }
+  to { transform: translateX(0); }
+}
+
+@keyframes scrollLeft {
+  from { transform: translateX(0); }
+  to { transform: translateX(-50%); }
+}
+
+/* ==========================================================================
+   REDUCED MOTION
+   ========================================================================== */
+
+@media (prefers-reduced-motion: reduce) {
+  .gallery-animation__track {
+    animation: none !important;
+  }
+}