All working nicely

static/main.css

@@ -297,6 +297,7 @@ iframe {
 
 #compose {
     display: none;
+    flex-direction: column;
     position: fixed;
     top: 5%;
     left: 50%;
@@ -305,7 +306,7 @@ iframe {
 
     max-height: 85vh;
     max-width: 600px;
-    overflow-y: auto; 
+    overflow-y: auto;
 
     background-color: var(--main-bg-color);
     z-index: 100;
@@ -316,14 +317,58 @@ iframe {
     box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
 }
 
+#compose-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 4px 8px;
+}
+
+@media (pointer: coarse) {
+    #compose {
+        top: 0;
+        width: 100%;
+        height: 100dvh;
+        max-height: 100dvh;
+        box-sizing: border-box;
+        overflow-y: hidden;
+        border: none;
+        border-radius: 0;
+        box-shadow: none;
+    }
+
+    #textarea_post {
+        flex: 1;
+        min-height: 0;
+        height: auto;
+        max-height: none;
+        resize: none;
+        border: none;
+    }
+
+    #textarea_post:focus {
+        outline: none;
+    }
+
+    #compose-reply-area {
+        border-bottom: 1px solid var(--border-color);
+        margin-bottom: 0;
+    }
+}
+
 #compose-reply-area {
     display: none;
     padding: 8px 10px;
     margin-bottom: 8px;
-    border-left: 3px solid var(--highlight-fg-color);
     font-size: 0.85em;
 }
 
+.compose-reply-author {
+    font-weight: bold;
+    font-size: 0.85em;
+    margin-bottom: 2px;
+}
+
 .compose-reply-preview {
     display: flex;
     gap: 10px;
@@ -337,16 +382,15 @@ iframe {
 }
 
 .compose-reply-preview-text iframe {
-    width: 120px;
     height: 68px;
     pointer-events: none;
 }
 
 .compose-reply-preview-image {
-    width: 48px;
-    height: 48px;
-    max-width: 48px;
-    max-height: 48px;
+    width: 96px;
+    height: 96px;
+    max-width: 96px;
+    max-height: 96px;
     object-fit: cover;
     border-radius: 4px;
     flex-shrink: 0;