Unifying style of the gallery

Fixed HTML and Sass layout
Moved upload and login pages to popups
Added deletion confirmation

gallery/user/themes/default/ui/gallery.sass

@@ -0,0 +1,117 @@
+.gallery
+    margin: 0
+    padding: 0
+
+    width: 100%
+
+    display: grid
+    grid-template-columns: auto auto auto auto auto auto
+    gap: 0.5rem
+
+@media (max-width: 1300px)
+    .gallery
+        grid-template-columns: auto auto auto auto
+
+@media (max-width: 800px)
+    .gallery
+        grid-template-columns: auto auto auto
+
+.gallery__item
+    margin: 0
+    padding: 0
+
+    height: auto
+
+    position: relative
+
+    background: linear-gradient(to right, darken($white, 1%) 15%, darken($white, 10%) 35%, darken($white, 1%) 50%)
+    background-size: 1000px 640px
+    animation: imgLoading 1.8s linear infinite forwards
+    border-radius: $rad
+
+    box-sizing: border-box
+    overflow: hidden
+
+    &:after
+        content: ""
+        display: block
+        padding-bottom: 100%
+
+.gallery__item-info
+    margin: 0
+    padding: 0
+
+    width: 100%
+    height: 100%
+
+    position: absolute
+    left: 0
+    bottom: 0
+
+    display: flex
+    flex-direction: column
+    justify-content: flex-end
+
+    background-image: linear-gradient(to bottom, rgba($black, 0), rgba($black, 0.8))
+
+    z-index: +1
+
+    opacity: 0 // hide
+    transform: scale(1.05) // scale up
+    transition: all 0.5s cubic-bezier(.79, .14, .15, .86)
+
+    h2
+        margin: 0
+        padding: 0 1rem 0.5rem
+
+        font-size: 1rem
+        font-weight: 600
+
+        color: $primary
+
+        text-overflow: ellipsis
+        overflow: hidden
+
+        opacity: 0 // hide
+        transition: all 0.2s ease-in-out
+
+    p
+        margin: 0
+        padding: 0 1rem 0.5rem
+
+        font-size: 0.8rem
+        font-weight: 500
+
+        color: $white
+
+        text-overflow: ellipsis
+        overflow: hidden
+
+        opacity: 0 // hide
+        transition: all 0.2s ease-in-out
+
+    &:hover
+        opacity: 1
+        transform: scale(1)
+
+        h2, p
+            opacity: 1
+
+.gallery__item-image
+        margin: 0
+        padding: 0
+
+        width: 100%
+        height: 100%
+
+        position: absolute
+        top: 0
+        left: 0
+        right: 0
+        bottom: 0
+
+        object-fit: cover
+        object-position: center
+
+        //background-color: $black
+        border-radius: $rad