diff --git a/tl/resources/public/css/app.css b/tl/resources/public/css/app.css
index 74b4bf5..38f661c 100644
--- a/tl/resources/public/css/app.css
+++ b/tl/resources/public/css/app.css
@@ -6,6 +6,7 @@ body { overflow: hidden; }
 
 .app {
   height: 100vh;
+  height: 100dvh;            /* avoids mobile URL-bar jump where supported */
   display: flex;
   flex-direction: column;
   overflow: hidden;
@@ -15,21 +16,23 @@ body { overflow: hidden; }
 }
 
 /* --- top region: video | annotation ------------------------------------ */
-.top { display: flex; min-height: 0; }
+/* sizes are relative (vh / %), set via CSS vars from the app; px mins below */
+.top { display: flex; min-height: 140px; height: var(--top-h, 46vh); }
 
 .video-pane {
-  flex-shrink: 0;
+  flex-shrink: 0; width: var(--video-w, 50%); min-width: 200px;
   display: flex; align-items: center; justify-content: center;
-  background: #000; overflow: hidden; min-width: 0;
+  background: #000; overflow: hidden;
 }
 .video-pane video { max-width: 100%; max-height: 100%; display: block; background: #000; }
 
-.annot-pane { flex: 1; min-width: 0; display: flex; }
+.annot-pane { flex: 1; min-width: 200px; display: flex; }
 
 /* --- draggable dividers ------------------------------------------------- */
-.divider-v { flex-shrink: 0; width: 6px; cursor: col-resize; background: #222; }
-.divider-h { flex-shrink: 0; height: 6px; cursor: row-resize; background: #222; }
-.divider-v:hover, .divider-h:hover { background: #3a6ea5; }
+/* touch-action:none so a drag doesn't scroll the page on touch devices */
+.divider-v { flex-shrink: 0; width: 7px; cursor: col-resize; background: #222; touch-action: none; }
+.divider-h { flex-shrink: 0; height: 7px; cursor: row-resize; background: #222; touch-action: none; }
+.divider-v:hover, .divider-h:hover, .divider-v:active, .divider-h:active { background: #3a6ea5; }
 
 /* --- commentary --------------------------------------------------------- */
 .commentary {
@@ -69,6 +72,94 @@ body { overflow: hidden; }
 }
 .jump-pop button:hover { background: #2a4a6a; }
 
+/* --- commentary head + actions ----------------------------------------- */
+.commentary-head { margin-bottom: 8px; }
+.add-btn {
+  width: 100%; background: #1c2a38; color: #cfe3f5;
+  border: 1px solid #3a6ea5; border-radius: 4px;
+  padding: 6px 8px; cursor: pointer; font-size: 12px;
+}
+.add-btn:hover { background: #24384e; }
+.ann-actions { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
+.edit-btn {
+  background: none; color: #7aa6d6; border: 1px solid transparent;
+  border-radius: 4px; padding: 1px 6px; cursor: pointer; font-size: 11px;
+}
+.edit-btn:hover { color: #cfe3f5; border-color: #3a6ea5; }
+.del-btn {
+  background: none; color: #a66; border: 1px solid transparent;
+  border-radius: 4px; padding: 1px 6px; cursor: pointer; font-size: 11px;
+}
+.del-btn:hover { color: #e66; border-color: #a44; }
+
+.clip.clickable { cursor: copy; outline: 1px solid #5ab07a; }
+
+/* --- authoring form (fills the annotation pane) ------------------------- */
+.form {
+  flex: 1; min-width: 0; overflow-y: auto;
+  background: #111; border: 1px solid #333; box-sizing: border-box;
+  padding: 10px 12px;
+  display: flex; flex-direction: column; gap: 10px;
+}
+.form-head { font-size: 13px; font-weight: 600; color: #cfe3f5; }
+.form-row { display: flex; gap: 8px; align-items: center; }
+.form-name { flex: 1; }
+.form input[type=text], .form-name, .form-content {
+  background: #0e0e0e; color: #ddd; border: 1px solid #333;
+  border-radius: 4px; padding: 6px 8px; font-size: 13px;
+}
+.form-color { width: 40px; height: 32px; padding: 0; border: 1px solid #333;
+              border-radius: 4px; background: #0e0e0e; cursor: pointer; }
+.form-content { width: 100%; min-height: 70px; resize: vertical; box-sizing: border-box;
+                font-family: inherit; }
+.form-marks-label { font-size: 11px; text-transform: uppercase; letter-spacing: 1px;
+                    color: #7aa6d6; margin-top: 4px; }
+
+.mark-row { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
+.mark-arrow { color: #666; }
+.row-x, .add-mark {
+  background: #1c1c1c; color: #aaa; border: 1px solid #333; border-radius: 4px;
+  padding: 3px 8px; cursor: pointer; font-size: 12px;
+}
+.row-x:hover { color: #e66; border-color: #a44; }
+.add-mark { align-self: flex-start; color: #cfe3f5; border-color: #3a6ea5; }
+
+/* point editor + autocomplete */
+.pt-input { position: relative; flex: 1 1 130px; display: inline-block; }
+.pt-text {
+  width: 100%; box-sizing: border-box;
+  background: #0e0e0e; color: #ddd; border: 1px solid #333;
+  border-radius: 4px; padding: 6px 8px; font-size: 13px;
+}
+.pt-dropdown {
+  position: absolute; left: 0; right: 0; top: 100%; z-index: 5;
+  margin: 2px 0 0; padding: 4px; list-style: none;
+  max-height: 220px; overflow-y: auto;
+  background: #1b1b1b; border: 1px solid #3a6ea5; border-radius: 4px;
+  box-shadow: 0 6px 18px rgba(0,0,0,0.5);
+}
+.pt-dropdown li { padding: 4px 6px; border-radius: 3px; font-size: 12px;
+                  color: #cde; cursor: pointer; white-space: nowrap;
+                  overflow: hidden; text-overflow: ellipsis; }
+.pt-dropdown li.hi { background: #2a4a6a; }
+
+.pt-chip { flex: 1; display: flex; align-items: center; gap: 4px;
+           background: #233; border: 1px solid #3a6ea5; border-radius: 4px;
+           padding: 2px 4px; }
+.pt-chip-name { font-size: 12px; color: #cfe3f5; white-space: nowrap;
+                overflow: hidden; text-overflow: ellipsis; flex: 1; }
+.pt-frame { width: 56px; background: #0e0e0e; color: #ddd; border: 1px solid #333;
+            border-radius: 3px; padding: 2px 4px; font-size: 12px; }
+.pt-dur { color: #889; font-size: 11px; white-space: nowrap; }
+.pt-x { background: none; border: none; color: #a99; cursor: pointer; font-size: 14px; }
+.pt-x:hover { color: #e66; }
+
+.form-hint { font-size: 11px; color: #777; }
+.form-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 4px; }
+.save, .cancel { border-radius: 4px; padding: 6px 14px; cursor: pointer; font-size: 13px; }
+.save { background: #2a4a6a; color: #fff; border: 1px solid #3a6ea5; }
+.cancel { background: #1c1c1c; color: #aaa; border: 1px solid #333; }
+
 /* --- markdown (tl.md output is wrapped in .md) -------------------------- */
 .md h1 { font-size: 16px; margin: 0 0 6px; line-height: 1.25; }
 .md h2 { font-size: 14px; margin: 0 0 6px; line-height: 1.25; }
@@ -79,12 +170,18 @@ body { overflow: hidden; }
 .md code { background: #222; padding: 0 3px; border-radius: 3px; font-size: 12px; }
 
 /* --- timeline region ---------------------------------------------------- */
-.timeline-pane { flex: 1; display: flex; flex-direction: column; min-height: 0; }
+.timeline-pane { flex: 1; display: flex; flex-direction: column; min-height: 150px; }
 
-.toolbar { display: flex; gap: 20px; align-items: center; padding: 6px 8px;
-           background: #0c0c0c; border-bottom: 1px solid #222; flex-shrink: 0; }
+.toolbar { display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center;
+           padding: 6px 8px; background: #0c0c0c; border-bottom: 1px solid #222;
+           flex-shrink: 0; }
 .slider { display: flex; align-items: center; gap: 6px; font-size: 11px; color: #9ab; }
-.slider input { width: 150px; }
+.slider input { width: 150px; touch-action: none; }
+.play-btn {
+  background: #1c2a38; color: #cfe3f5; border: 1px solid #3a6ea5;
+  border-radius: 4px; padding: 2px 12px; cursor: pointer; font-size: 14px; line-height: 1.4;
+}
+.play-btn:hover { background: #24384e; }
 
 .timeline-scroll { flex: 1; overflow-y: auto; overflow-x: hidden; min-height: 0; }
 .timeline { display: flex; align-items: flex-start; background: #111; }
@@ -117,3 +214,13 @@ body { overflow: hidden; }
 .ann-bar-label { position: absolute; top: 1px; font-size: 9px; line-height: 16px;
                  color: #eee; white-space: nowrap; pointer-events: none;
                  text-shadow: 0 1px 2px #000; }
+
+/* --- mobile: stack the top region vertically (video over annotation) ---- */
+@media (max-width: 720px) {
+  .top { flex-direction: column; }
+  .divider-v { display: none; }                  /* width-split is meaningless when stacked */
+  .video-pane { width: 100%; min-width: 0; flex: 1 1 0; min-height: 110px; }
+  .annot-pane { width: 100%; min-width: 0; flex: 1 1 0; min-height: 110px; }
+  .divider-h { height: 14px; }                   /* bigger touch target (top vs timeline) */
+  .slider input { width: 120px; }
+}
diff --git a/tl/resources/public/icons/apple-touch-icon.png b/tl/resources/public/icons/apple-touch-icon.png
new file mode 100644
index 0000000..f375569
Binary files /dev/null and b/tl/resources/public/icons/apple-touch-icon.png differ
diff --git a/tl/resources/public/icons/icon-192.png b/tl/resources/public/icons/icon-192.png
new file mode 100644
index 0000000..823e1e6
Binary files /dev/null and b/tl/resources/public/icons/icon-192.png differ
diff --git a/tl/resources/public/icons/icon-512.png b/tl/resources/public/icons/icon-512.png
new file mode 100644
index 0000000..94f8383
Binary files /dev/null and b/tl/resources/public/icons/icon-512.png differ
diff --git a/tl/resources/public/index.html b/tl/resources/public/index.html
index a9a0f93..5b0f759 100644
--- a/tl/resources/public/index.html
+++ b/tl/resources/public/index.html
@@ -2,9 +2,18 @@
 <html lang="en">
   <head>
     <meta charset='utf-8'>
-    <meta name="viewport" content="width=device-width,initial-scale=1">
+    <meta name="viewport" content="width=device-width,initial-scale=1,viewport-fit=cover">
     <title>tl</title>
     <link rel="stylesheet" href="/css/app.css">
+
+    <!-- installable home-screen app (no service worker / HTTPS needed for iOS) -->
+    <link rel="manifest" href="/manifest.webmanifest">
+    <meta name="theme-color" content="#0c0c0c">
+    <meta name="apple-mobile-web-app-capable" content="yes">
+    <meta name="mobile-web-app-capable" content="yes">
+    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
+    <meta name="apple-mobile-web-app-title" content="tl">
+    <link rel="apple-touch-icon" href="/icons/apple-touch-icon.png">
   </head>
   <body>
     <noscript>
diff --git a/tl/resources/public/manifest.webmanifest b/tl/resources/public/manifest.webmanifest
new file mode 100644
index 0000000..5d56c43
--- /dev/null
+++ b/tl/resources/public/manifest.webmanifest
@@ -0,0 +1,14 @@
+{
+  "name": "tl — timeline",
+  "short_name": "tl",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "orientation": "any",
+  "background_color": "#0c0c0c",
+  "theme_color": "#0c0c0c",
+  "icons": [
+    { "src": "/icons/icon-192.png", "sizes": "192x192", "type": "image/png", "purpose": "any" },
+    { "src": "/icons/icon-512.png", "sizes": "512x512", "type": "image/png", "purpose": "any" }
+  ]
+}