diff --git a/src/renderer/styles.css b/src/renderer/styles.css
index b76c545..1cd00d9 100644
--- a/src/renderer/styles.css
+++ b/src/renderer/styles.css
@@ -1770,13 +1770,17 @@ textarea,
 
 .app-update-release-notes-popover {
   display: grid;
-  width: min(420px, calc(100vw - 32px));
-  max-height: min(520px, calc(100vh - 96px));
-  gap: 12px;
+  width: min(560px, calc(100vw - 32px));
+  max-height: min(640px, calc(100vh - 32px), var(--radix-popover-content-available-height));
+  grid-template-rows: auto minmax(0, 1fr);
+  gap: 0;
+  padding: 0;
   overflow: hidden;
 }
 
 .app-update-release-notes-header {
+  padding: 18px 20px;
+  border-bottom: 1px solid var(--border);
   display: grid;
   grid-template-columns: minmax(0, 1fr) auto;
   align-items: start;
@@ -1787,22 +1791,64 @@ textarea,
   margin: 0;
   overflow: hidden;
   color: var(--foreground);
-  font-size: 0.95rem;
+  font-size: 1.1rem;
   font-weight: 600;
   line-height: 1.3;
-  text-overflow: ellipsis;
-  white-space: nowrap;
+  overflow-wrap: anywhere;
 }
 
 .app-update-release-notes-body {
+  padding: 20px;
+  scrollbar-gutter: stable;
+  overscroll-behavior: contain;
   min-height: 0;
   overflow: auto;
   color: var(--foreground);
   font-size: 0.85rem;
-  line-height: 1.5;
+  line-height: 1.65;
   overflow-wrap: anywhere;
 }
 
+.app-update-release-notes-body :is(h1, h2, h3, h4, h5, h6) {
+  margin: 24px 0 12px;
+  color: var(--foreground);
+  font-size: 0.95rem;
+  font-weight: 650;
+  line-height: 1.4;
+}
+
+.app-update-release-notes-body :is(p, ul, ol, pre, blockquote) {
+  margin-block: 12px;
+}
+
+.app-update-release-notes-body ul {
+  list-style-type: disc;
+}
+
+.app-update-release-notes-body ol {
+  list-style-type: decimal;
+}
+
+.app-update-release-notes-body li + li {
+  margin-top: 10px;
+}
+
+.app-update-release-notes-body li::marker {
+  color: var(--muted-foreground);
+}
+
+.app-update-release-notes-body a {
+  color: var(--primary);
+  text-decoration: underline;
+  text-underline-offset: 3px;
+}
+
+.app-update-release-notes-body blockquote {
+  border-left: 2px solid var(--border);
+  padding-left: 12px;
+  color: var(--muted-foreground);
+}
+
 .app-update-release-notes-body > :first-child {
   margin-top: 0;
 }
@@ -1825,6 +1871,7 @@ textarea,
 
 .app-update-release-notes-status,
 .app-update-release-notes-error {
+  padding: 20px;
   margin: 0;
   font-size: 0.84rem;
   line-height: 1.45;