css : move to sass

assets/css/src/_mobile.scss

@@ -0,0 +1,35 @@
+@media screen and (max-width: 1000px) {
+  body {
+    background-color: red;
+  }
+
+  .project-slideshow {
+    position: fixed;
+    top: 0;
+    width: 100vw;
+    left: 0;
+    margin: 0;
+    height: 50vh;
+  }
+  .project-slideshow img {
+    width: 100%;
+    height: 100%;
+    object-fit: cover;
+  }
+
+  .main-title {
+    z-index: 2;
+    position: fixed;
+  }
+
+  .project-index :has(.selected) {
+  }
+
+  .fix {
+    display: block;
+  }
+
+  .project-toggler.grid {
+    display: block;
+  }
+}