+/* images */
+
+figure {
+ margin: 0;
+ position: relative;
+}
+figcaption {
+ position: absolute;
+ padding: 0 1em;
+ color: #000;
+ background: rgba(255, 255, 255, .66);
+ right: 0;
+ bottom: 0;
+}
+img {
+ vertical-align: bottom;
+ width: 100%;
+}
+
+/* image gallery */
+
+.gallery {
+ display: grid;
+ grid: auto-flow dense / repeat(auto-fit, minmax(200px, 1fr));
+ grid-gap: 1px;
+}
+.gallery li, .gallery ul {
+ display: contents;
+}
+.gallery figure {
+ overflow: hidden;
+ box-sizing: border-box;
+}
+.gallery figcaption > small {
+ display: inline-block;
+}
+
+@media (min-width: 403px) and (min-height: 266px) {
+ /* able to fit 2 cells of 200x133 */
+ .gallery li.large > figure {
+ grid-row: span 2;
+ grid-column: span 2;
+ }
+}
+@media (min-width: 603px) and (min-height: 400px) {
+ /* fit 3 cells of 200x133 */
+ .gallery > ul > li:first-child > figure,
+ .gallery li.huge > figure {
+ grid-row: span 3;
+ grid-column: span 3;
+ }
+}
+
+.gallery figure, .gallery figcaption {
+ transition: all .5s ease-in;
+}
+.gallery figure:hover ~ ul figcaption {
+ /* mark all children */
+ color: #FFF;
+ background: rgba(0, 0, 0, .5);
+}
+
+.gallery li.parent:hover > figure > figcaption,
+.gallery figure:hover > figcaption {
+ /* highlight title of current and parents */
+ font-size: 175%;
+ right: 50%;
+ bottom: 50%;
+ transform: translate(50%, 50%);
+ margin-left: -60%; /* keep width */
+}
+