diff --git a/src/web/public/index.html b/src/web/public/index.html
index 5e9f17a7..a36975a9 100644
--- a/src/web/public/index.html
+++ b/src/web/public/index.html
@@ -2353,7 +2353,7 @@
               <span class="form-hint">Runs this case in a hardened, isolated container. The base image is built automatically on first use. Docker/Podman must be installed.</span>
             </div>
             <details class="advanced-options docker-quick-settings" id="dockerQuickSettings">
-              <summary>Container settings (optional, sensible defaults)</summary>
+              <summary><svg class="set-adv-chev" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.4" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M6 9l6 6 6-6"/></svg><span>Container settings (optional, sensible defaults)</span></summary>
               <div class="advanced-options-content">
                 <div class="form-row">
                   <label>Template</label>
@@ -2433,7 +2433,7 @@
               <span class="form-hint">Which CLI to point the Run button at once the clone finishes. Changeable any time from the Run dropdown.</span>
             </div>
             <details class="advanced-options">
-              <summary>Clone options</summary>
+              <summary><svg class="set-adv-chev" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.4" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M6 9l6 6 6-6"/></svg><span>Clone options</span></summary>
               <div class="advanced-options-content">
                 <div class="form-row">
                   <label class="checkbox-row"><input type="checkbox" id="cloneShallow"> Shallow clone (--depth 1)</label>
@@ -2507,7 +2507,7 @@
               <span class="form-hint">Optional. Leave blank to use exec codex on the remote host.</span>
             </div>
             <details class="advanced-options">
-              <summary>Advanced SSH</summary>
+              <summary><svg class="set-adv-chev" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.4" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M6 9l6 6 6-6"/></svg><span>Advanced SSH</span></summary>
               <div class="advanced-options-content">
                 <div class="form-row">
                   <label>Identity File</label>
@@ -2533,7 +2533,7 @@
             </details>
             <!-- COD-105 — discover + attach existing remote tmux sessions this Codeman didn't create. -->
             <details class="advanced-options" id="remoteDiscoverSection">
-              <summary>Discover existing sessions</summary>
+              <summary><svg class="set-adv-chev" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.4" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M6 9l6 6 6-6"/></svg><span>Discover existing sessions</span></summary>
               <div class="advanced-options-content">
                 <span class="form-hint">Find <code>codeman-*</code> tmux sessions already running on this host (started by the remote's own Codeman or another instance) and attach to one. Attaching shares the session; closing the tab detaches it — it is never killed.</span>
                 <div class="form-row" style="margin-top: 8px;">
@@ -2579,7 +2579,7 @@
               </select>
             </div>
             <details class="advanced-options">
-              <summary>Advanced container settings</summary>
+              <summary><svg class="set-adv-chev" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.4" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M6 9l6 6 6-6"/></svg><span>Advanced container settings</span></summary>
               <div class="advanced-options-content">
                 <div class="form-row">
                   <label>Memory</label>
diff --git a/src/web/public/styles.css b/src/web/public/styles.css
index 356694d8..5bdb361b 100644
--- a/src/web/public/styles.css
+++ b/src/web/public/styles.css
@@ -15767,6 +15767,35 @@ html[data-skin="daylight-blue"] .welcome-btn-tunnel.active:hover {
   background: linear-gradient(90deg, var(--border), transparent);
 }
 
+/* `display: flex` above drops the browser's own disclosure triangle, so the
+   chevron is explicit markup. Without it these rows read as plain headings and
+   nobody thinks to click them (reported on Clone options / Container settings). */
+#createCaseModal .set-doc .advanced-options > summary {
+  list-style: none;
+}
+
+#createCaseModal .set-doc .advanced-options > summary::-webkit-details-marker {
+  display: none;
+}
+
+#createCaseModal .set-doc .advanced-options > summary .set-adv-chev {
+  flex-shrink: 0;
+  color: var(--text-dim);
+  transition: transform 0.18s, color 0.15s;
+}
+
+#createCaseModal .set-doc .advanced-options[open] > summary .set-adv-chev {
+  transform: rotate(180deg);
+}
+
+#createCaseModal .set-doc .advanced-options > summary:hover {
+  color: var(--text);
+}
+
+#createCaseModal .set-doc .advanced-options > summary:hover .set-adv-chev {
+  color: var(--accent);
+}
+
 #createCaseModal .set-doc .advanced-options-content {
   padding-top: 4px;
 }