diff --git a/CHANGELOG.md b/CHANGELOG.md
index ff11078e..871c5429 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,8 @@
 - Simplified the Sources inventory to six compact domain cards. Theme/time
   detail, active-source limitations and the complete candidate list now use
   progressive disclosure instead of competing for attention.
+- Stacked the source heading, explanation and operational-status badge on
+  narrow viewports so the introduction remains readable on mobile.
 - Expanded the Datavindplaats roadmap beyond hydrology with land use, space
   occupation, soil, population, services, accessibility, business parks,
   mobility hubs, cycle highways, heat and air quality.
diff --git a/backend/tests/test_sprint212_platform_source_portfolio.py b/backend/tests/test_sprint212_platform_source_portfolio.py
index ed51818f..5a7f689e 100644
--- a/backend/tests/test_sprint212_platform_source_portfolio.py
+++ b/backend/tests/test_sprint212_platform_source_portfolio.py
@@ -42,6 +42,8 @@ def test_source_inventory_is_compact_honest_and_domain_driven() -> None:
     assert "Meetbaar als:" in catalog
     assert "source-domain-grid" in styles
     assert "source-opportunity-domain" in styles
+    assert ".source-catalog-panel .panel-title-row" in styles
+    assert "justify-self: start" in styles
 
 
 def test_roadmap_prioritizes_cross_domain_profile_before_more_water_layers() -> None:
diff --git a/docs/CODEX_EXECUTION_LOG.md b/docs/CODEX_EXECUTION_LOG.md
index 2a23c7ca..d7db7451 100644
--- a/docs/CODEX_EXECUTION_LOG.md
+++ b/docs/CODEX_EXECUTION_LOG.md
@@ -9004,6 +9004,8 @@ Implemented:
 - Reworked the Sources inventory into six compact domain summaries. Detailed
   theme/timeline state, active source limitations and candidate-source cards
   remain accessible through progressive disclosure.
+- Live responsive review found and fixed a narrow-viewport title-row squeeze;
+  the status badge now stacks below the source introduction on mobile.
 - Rewrote the Datavindplaats roadmap around a cross-domain area profile. The
   next recommended implementation is a fixed allowlist of Mercator thematic
   rasters plus the digital soil map, not another isolated water connector.
diff --git a/frontend/src/styles/app.css b/frontend/src/styles/app.css
index a5a0dd92..26855356 100644
--- a/frontend/src/styles/app.css
+++ b/frontend/src/styles/app.css
@@ -6926,6 +6926,15 @@ section {
 }
 
 @media (max-width: 640px) {
+  .source-catalog-panel .panel-title-row {
+    display: grid;
+    gap: 0.6rem;
+  }
+
+  .source-catalog-panel .panel-title-row .status-badge {
+    justify-self: start;
+  }
+
   .source-domain-grid,
   .source-catalog-grid,
   .source-catalog-loaded,