Added SASS files to be pre-processed as CSS by a file watcher

assets/sass/themes/default/parts/_banner.sass

@@ -0,0 +1,80 @@
+@use '../palettes/animations' as motion
+@use '../palettes/typewriters' as typo
+@use '../palettes/stylebook' as book
+@use '../palettes/brushes' as hues
+
+@keyframes breathe_one
+    @include motion.dilating-expanding(15vw, 15vh)
+
+@media (orientation: portrait)
+    @keyframes breathe_two
+        @include motion.dilating-expanding(30vw, 30vh)
+
+#banner
+    text-align: center
+
+    #site_nav
+        background-color: inherit
+        font-size: clamp(10pt, 1vw, 16pt)
+
+    #site_title
+        font-size: clamp(12pt, 2vw, 64pt)
+
+@media (orientation: landscape)
+    #banner
+        padding: book.$topbottom-framing-pad 0
+        
+        & #site_logo
+            // width: 10vw
+            // height: 10vh
+            width: 15vw
+            height: 15vh
+
+@media (orientation: portrait)
+    #banner
+        & #site_logo
+            // width: 20vw
+            // height: 20vh
+            width: 30vw
+            height: 30vh
+
+
+        & #site_title
+            position: relative
+            bottom: 3vh
+
+@media screen
+    #banner #site_title
+        transition: letter-spacing 1s, margin-bottom 1s
+
+        &:hover
+            letter-spacing: 5pt
+
+    #banner #site_nav > a
+        font-weight: bold
+        font-family: typo.$sys-message-font
+        margin: 1vw
+        padding: 10px
+        border-radius: 10%
+
+        &:link
+            color: hues.$border-helper-base-color
+
+        &:active, &:visited
+            background-color: hues.$bg-helper-highlight-color
+            color: hues.$border-helper-base-color
+            box-shadow: inset book.$shared-shadow-depth hues.$bg-helper-lowlight-color
+
+    @media (orientation: landscape)
+        #banner #site_logo
+            &:hover, &:active
+                animation: breathe_one 4s infinite
+
+    @media (orientation: portrait)
+        #banner #site_logo
+            &:hover, &:active
+                animation: breathe_two 4s infinite
+
+        #banner #site_nav
+            margin-top: -3vh
+            margin-bottom: 5vh