diff --git a/config.py b/config.py
index acb0e06..3aaef21 100644
--- a/config.py
+++ b/config.py
@@ -320,7 +320,7 @@ YOUTUBE_API_KEY = os.getenv('YOUTUBE_API_KEY', '')
 # ==========================================
 # 系統版本與路徑
 # ==========================================
-SYSTEM_VERSION = "V10.114"
+SYSTEM_VERSION = "V10.115"
 LOG_FILE_PATH = os.path.join(BASE_DIR, 'logs/system.log')
 public_url = PUBLIC_URL  # 用於模板顯示
 
diff --git a/static/css/observability-system.css b/static/css/observability-system.css
index c4cdc03..57d49d5 100644
--- a/static/css/observability-system.css
+++ b/static/css/observability-system.css
@@ -2108,3 +2108,47 @@
   gap: 0.5rem !important;
   max-width: 100%;
 }
+
+/* v3.5 hero density: inline legacy templates must not reserve decorative empty space. */
+.momo-observability-mode :is(
+  .obs-hero,
+  .agent-hero,
+  .biz-command,
+  .runtime-hero,
+  .calls-hero,
+  .gov-hero,
+  .gate-hero,
+  .rag-hero,
+  .qa-hero,
+  .quality-hero,
+  .ppt-hero
+) {
+  min-height: 0 !important;
+}
+
+.momo-observability-mode :is(
+  .obs-hero,
+  .agent-hero,
+  .biz-command,
+  .runtime-hero,
+  .calls-hero,
+  .gov-hero,
+  .gate-hero,
+  .rag-hero,
+  .qa-hero,
+  .quality-hero,
+  .ppt-hero,
+  .obs-panel,
+  .agent-panel,
+  .biz-panel,
+  .runtime-panel,
+  .calls-panel,
+  .gov-panel,
+  .gate-panel,
+  .rag-panel,
+  .qa-panel,
+  .quality-panel,
+  .ppt-panel
+)::after {
+  display: none !important;
+}
diff --git a/web/static/css/observability-system.css b/web/static/css/observability-system.css
index c4cdc03..57d49d5 100644
--- a/web/static/css/observability-system.css
+++ b/web/static/css/observability-system.css
@@ -2108,3 +2108,47 @@
   gap: 0.5rem !important;
   max-width: 100%;
 }
+
+/* v3.5 hero density: inline legacy templates must not reserve decorative empty space. */
+.momo-observability-mode :is(
+  .obs-hero,
+  .agent-hero,
+  .biz-command,
+  .runtime-hero,
+  .calls-hero,
+  .gov-hero,
+  .gate-hero,
+  .rag-hero,
+  .qa-hero,
+  .quality-hero,
+  .ppt-hero
+) {
+  min-height: 0 !important;
+}
+
+.momo-observability-mode :is(
+  .obs-hero,
+  .agent-hero,
+  .biz-command,
+  .runtime-hero,
+  .calls-hero,
+  .gov-hero,
+  .gate-hero,
+  .rag-hero,
+  .qa-hero,
+  .quality-hero,
+  .ppt-hero,
+  .obs-panel,
+  .agent-panel,
+  .biz-panel,
+  .runtime-panel,
+  .calls-panel,
+  .gov-panel,
+  .gate-panel,
+  .rag-panel,
+  .qa-panel,
+  .quality-panel,
+  .ppt-panel
+)::after {
+  display: none !important;
+}