diff --git a/CHANGELOG.md b/CHANGELOG.md
index b5ee9dd..8e7a2ca 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,28 @@
 
 All notable changes to Multi-Debrid Downloader are documented in this file.
 
+## [2.0.20] - 2026-08-11
+
+### Downloads and selection
+
+- Added package selection through a normal row click while preserving Control, Command, and Shift selection behavior.
+- Added package expansion and collapse through a double-click on unused row space while keeping the disclosure button available.
+- Kept renaming, checkboxes, progress meters, links, form controls, and action buttons isolated from the row disclosure gesture.
+- Replaced segmented selection markers with a continuous three-pixel success-colored edge across adjacent selected packages and files.
+- Extended package selection markers across card separators so consecutive selected packages no longer show one-pixel gaps.
+
+### Sidebar motion
+
+- Removed the empty sidebar rail when the sidebar is collapsed.
+- Added synchronized 520-millisecond width and panel transitions for smooth sidebar opening and closing.
+- Kept the sidebar edge control visible and reachable while the sidebar content is fully hidden.
+- Preserved the requested sidebar motion when Windows application animations are disabled.
+
+### Reliability and testing
+
+- Added regression coverage for zero-width sidebar collapse, synchronized sidebar motion, package row selection, double-click disclosure boundaries, and continuous selection markers.
+- Added rendered-pixel verification for the updated interactions and continuous selection edge.
+
 ## [2.0.19] - 2026-08-11
 
 ### Interface fixes
diff --git a/package-lock.json b/package-lock.json
index 59a0acc..ece4042 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "real-debrid-downloader",
-  "version": "2.0.19",
+  "version": "2.0.20",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "real-debrid-downloader",
-      "version": "2.0.19",
+      "version": "2.0.20",
       "license": "MIT",
       "dependencies": {
         "adm-zip": "0.6.0",
diff --git a/package.json b/package.json
index 6abe910..3a7b5c3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "real-debrid-downloader",
-  "version": "2.0.19",
+  "version": "2.0.20",
   "description": "Desktop downloader",
   "main": "build/main/main/main.js",
   "author": "Sucukdeluxe",
diff --git a/src/renderer/shell/AppSidebar.tsx b/src/renderer/shell/AppSidebar.tsx
index 748fb20..0ec8a2a 100644
--- a/src/renderer/shell/AppSidebar.tsx
+++ b/src/renderer/shell/AppSidebar.tsx
@@ -21,8 +21,10 @@ export function AppSidebar({
       className={`md-shell-sidebar${collapsed ? " is-collapsed" : ""}${responsiveRail ? " is-responsive-rail" : ""}`}
       data-ui-region="sidebar"
     >
-      {children ? <div className="md-shell-sidebar-scroll">{children}</div> : null}
-      {status ? <div className="md-shell-sidebar-status" data-ui-region="sidebar-status">{status}</div> : null}
+      <div className="md-shell-sidebar-panel">
+        {children ? <div className="md-shell-sidebar-scroll">{children}</div> : null}
+        {status ? <div className="md-shell-sidebar-status" data-ui-region="sidebar-status">{status}</div> : null}
+      </div>
       <button
         aria-label={collapsed ? "Seitenleiste ausklappen" : "Seitenleiste einklappen"}
         className="md-shell-sidebar-toggle"
diff --git a/src/renderer/shell/shell.css b/src/renderer/shell/shell.css
index db1b44b..606548e 100644
--- a/src/renderer/shell/shell.css
+++ b/src/renderer/shell/shell.css
@@ -404,6 +404,7 @@
   min-height: 0;
   grid-template-columns: minmax(0, 1fr);
   gap: 8px;
+  transition: grid-template-columns 520ms cubic-bezier(0.22, 0.76, 0.22, 1);
 }
 
 .md-shell.has-sidebar .md-shell-workspace {
@@ -411,10 +412,10 @@
 }
 
 .md-shell.has-collapsed-sidebar .md-shell-workspace {
-  grid-template-columns: 56px minmax(0, 1fr);
+  grid-template-columns: 0 minmax(0, 1fr);
 }
 
-.md-shell-sidebar,
+.md-shell-sidebar-panel,
 .md-shell-main {
   position: relative;
   min-width: 0;
@@ -425,8 +426,24 @@
 }
 
 .md-shell-sidebar {
+  position: relative;
+  z-index: 4;
+  min-width: 0;
+  min-height: 0;
+}
+
+.md-shell-sidebar-panel {
   display: flex;
+  width: 270px;
+  height: 100%;
   flex-direction: column;
+  opacity: 1;
+  transform: translate3d(0, 0, 0);
+  visibility: visible;
+  transition:
+    opacity 260ms ease,
+    transform 520ms cubic-bezier(0.22, 0.76, 0.22, 1),
+    visibility 0s linear 0s;
 }
 
 .md-shell-sidebar-scroll {
@@ -465,16 +482,12 @@
   line-height: 16px;
 }
 
-.md-shell-sidebar.is-collapsed :where(.md-shell-sidebar-scroll, .md-shell-sidebar-status) {
-  overflow: hidden;
+.md-shell-sidebar.is-collapsed .md-shell-sidebar-panel {
   visibility: hidden;
   opacity: 0;
-  transform: translateX(-8px);
-}
-
-.md-shell-sidebar-scroll,
-.md-shell-sidebar-status {
-  transition: opacity 160ms ease, transform 160ms ease;
+  transform: translate3d(calc(-100% - 8px), 0, 0);
+  pointer-events: none;
+  transition-delay: 0s, 0s, 520ms;
 }
 
 .md-shell-sidebar-toggle {
@@ -507,6 +520,7 @@
 }
 
 .md-shell-sidebar:hover .md-shell-sidebar-toggle,
+.md-shell-sidebar.is-collapsed .md-shell-sidebar-toggle,
 .md-shell-sidebar-toggle:focus-visible {
   opacity: 1;
 }
@@ -907,6 +921,14 @@
     transition-duration: 0.01ms !important;
   }
 
+  .md-shell-workspace {
+    transition-duration: 520ms !important;
+  }
+
+  .md-shell-sidebar-panel {
+    transition-duration: 260ms, 520ms, 0s !important;
+  }
+
   .md-shell-navigation::before {
     transition-duration: 420ms, 420ms, 420ms, 120ms !important;
   }
diff --git a/src/renderer/views/downloads/DownloadsTable.tsx b/src/renderer/views/downloads/DownloadsTable.tsx
index 1acc049..10131af 100644
--- a/src/renderer/views/downloads/DownloadsTable.tsx
+++ b/src/renderer/views/downloads/DownloadsTable.tsx
@@ -18,6 +18,7 @@ export type DownloadSortColumn = "name" | "size" | "hoster" | "progress";
 
 const DOWNLOAD_SELECTION_COLUMN_WIDTH = "36px";
 const DOWNLOAD_ACTION_COLUMN_WIDTH = "60px";
+const PACKAGE_ROW_DISCLOSURE_EXCLUSION_SELECTOR = "button, input, select, textarea, a, [contenteditable='true'], .downloads-copyable, .downloads-meter";
 const useRendererLayoutEffect = typeof window === "undefined" ? useEffect : useLayoutEffect;
 
 type HosterLabel = ReturnType<typeof formatHosterLabel>;
@@ -40,6 +41,11 @@ function downloadGridTemplate(gridTemplate: string): string {
   return `${DOWNLOAD_SELECTION_COLUMN_WIDTH} ${gridTemplate} ${DOWNLOAD_ACTION_COLUMN_WIDTH}`;
 }
 
+function isPackageRowDisclosureExcluded(target: EventTarget | null): boolean {
+  const closest = (target as { closest?: (selector: string) => Element | null } | null)?.closest;
+  return typeof closest === "function" && closest.call(target, PACKAGE_ROW_DISCLOSURE_EXCLUSION_SELECTOR) !== null;
+}
+
 export const downloadColumnDefinitions: Record<string, { label: string; width: string; sortable?: DownloadSortColumn }> = {
   name: { label: "Name", width: "minmax(290px, 2.3fr)", sortable: "name" },
   size: { label: "Geladen / Größe", width: "minmax(140px, 1.1fr)", sortable: "size" },
@@ -489,9 +495,14 @@ export function PackageCardContent({ row, selectedIds, editing, editingName, pac
         role="row"
         style={{ gridTemplateColumns: downloadGridTemplate(gridTemplate) }}
         onClick={(event) => {
-          if (event.ctrlKey || event.metaKey || event.shiftKey) {
-            actions.onToggleSelection(entry.id, event.ctrlKey || event.metaKey, event.shiftKey);
-          }
+          if (event.detail > 1) return;
+          if (!event.ctrlKey && !event.metaKey && !event.shiftKey && selectedIds.size === 1 && selectedIds.has(entry.id)) return;
+          actions.onToggleSelection(entry.id, event.ctrlKey || event.metaKey, event.shiftKey);
+        }}
+        onDoubleClick={(event) => {
+          if (event.ctrlKey || event.metaKey || event.shiftKey || isPackageRowDisclosureExcluded(event.target)) return;
+          event.preventDefault();
+          actions.onTogglePackageCollapse(entry.id);
         }}
         onMouseDown={(event) => actions.onSelectionMouseDown(entry.id, event)}
         onMouseEnter={() => actions.onSelectionMouseEnter(entry.id)}
diff --git a/src/renderer/views/downloads/downloads.css b/src/renderer/views/downloads/downloads.css
index 58c55f6..a6292d3 100644
--- a/src/renderer/views/downloads/downloads.css
+++ b/src/renderer/views/downloads/downloads.css
@@ -300,6 +300,11 @@
   opacity: 0.58;
 }
 
+.downloads-package-card.is-selected,
+.downloads-package-card:has(.downloads-package-items-inner > .downloads-item-row:last-child.is-selected) {
+  position: relative;
+}
+
 .downloads-package-items {
   height: auto;
   overflow: hidden;
@@ -332,6 +337,7 @@
   color: var(--ui-text);
   background: transparent;
   border-color: var(--ui-border);
+  border-left: 3px solid transparent;
   contain: layout paint style;
   content-visibility: auto;
   contain-intrinsic-size: 40px;
@@ -346,8 +352,41 @@
 
 .downloads-item-row.is-selected,
 .downloads-package-card.is-selected > .downloads-package-row {
+  position: relative;
   background: color-mix(in srgb, var(--ui-success) 14%, var(--ui-canvas));
-  box-shadow: inset 3px 0 0 var(--ui-success);
+  border-left-color: var(--ui-success);
+}
+
+.downloads-item-row.is-selected::before {
+  content: "";
+  position: absolute;
+  z-index: 1;
+  inset: -1px auto -1px -3px;
+  width: 3px;
+  background: var(--ui-success);
+  pointer-events: none;
+}
+
+.downloads-package-card.is-selected::before {
+  content: "";
+  position: absolute;
+  z-index: 3;
+  inset: 0 auto auto 0;
+  width: 3px;
+  height: 41px;
+  background: var(--ui-success);
+  pointer-events: none;
+}
+
+.downloads-package-card:has(.downloads-package-items-inner > .downloads-item-row:last-child.is-selected)::after {
+  content: "";
+  position: absolute;
+  z-index: 3;
+  inset: auto auto -1px 0;
+  width: 3px;
+  height: 1px;
+  background: var(--ui-success);
+  pointer-events: none;
 }
 
 .downloads-package-row:hover,
diff --git a/tests/app-shell.test.tsx b/tests/app-shell.test.tsx
index 72bd1f2..eddb385 100644
--- a/tests/app-shell.test.tsx
+++ b/tests/app-shell.test.tsx
@@ -115,6 +115,47 @@ describe("desktop shell", () => {
     expect(html).not.toContain("data-ui-region=\"footer\"");
   });
 
+  it("collapses a populated sidebar to zero width while preserving the edge toggle", () => {
+    const html = renderToStaticMarkup(
+      <AppShell
+        activeView="downloads"
+        onViewChange={() => {}}
+        sidebar={<div>Filter</div>}
+        sidebarStatus={<div>2 Downloads</div>}
+        headerActions={null}
+        toolbar={null}
+        footer={null}
+        contextInfo={null}
+        sidebarCollapsed
+        onSidebarCollapsedChange={() => {}}
+      >
+        <div>Downloads</div>
+      </AppShell>
+    );
+    const shellCss = readFileSync(new URL("../src/renderer/shell/shell.css", import.meta.url), "utf8");
+
+    expect(html).toContain("has-collapsed-sidebar");
+    expect(html).toContain("md-shell-sidebar-panel");
+    expect(html).toContain("Seitenleiste ausklappen");
+    expect(shellCss).toMatch(/\.md-shell\.has-collapsed-sidebar \.md-shell-workspace\s*\{[^}]*grid-template-columns:\s*0 minmax\(0,\s*1fr\);/s);
+  });
+
+  it("slides the complete sidebar panel in both directions with the workspace width", () => {
+    const shellCss = readFileSync(new URL("../src/renderer/shell/shell.css", import.meta.url), "utf8");
+
+    expect(shellCss).toMatch(/\.md-shell-workspace\s*\{[^}]*transition:\s*grid-template-columns 520ms cubic-bezier\(0\.22, 0\.76, 0\.22, 1\);/s);
+    expect(shellCss).toMatch(/\.md-shell-sidebar-panel\s*\{[^}]*transform:\s*translate3d\(0, 0, 0\);[^}]*transition:[^}]*transform 520ms cubic-bezier\(0\.22, 0\.76, 0\.22, 1\)/s);
+    expect(shellCss).toMatch(/\.md-shell-sidebar\.is-collapsed \.md-shell-sidebar-panel\s*\{[^}]*transform:\s*translate3d\(calc\(-100% - 8px\), 0, 0\);[^}]*pointer-events:\s*none;/s);
+    expect(shellCss).toMatch(/\.md-shell-sidebar:hover \.md-shell-sidebar-toggle,\s*\.md-shell-sidebar\.is-collapsed \.md-shell-sidebar-toggle,\s*\.md-shell-sidebar-toggle:focus-visible\s*\{[^}]*opacity:\s*1;/s);
+  });
+
+  it("keeps the explicitly requested sidebar motion active when Windows animations are disabled", () => {
+    const shellCss = readFileSync(new URL("../src/renderer/shell/shell.css", import.meta.url), "utf8");
+
+    expect(shellCss).toMatch(/@media \(prefers-reduced-motion: reduce\)[\s\S]*\.md-shell-workspace\s*\{[^}]*transition-duration:\s*520ms !important;/s);
+    expect(shellCss).toMatch(/@media \(prefers-reduced-motion: reduce\)[\s\S]*\.md-shell-sidebar-panel\s*\{[^}]*transition-duration:\s*260ms, 520ms, 0s !important;/s);
+  });
+
   it("keeps every view sidebar on the same content axis", () => {
     const shellCss = readFileSync(new URL("../src/renderer/shell/shell.css", import.meta.url), "utf8").replaceAll("\r\n", "\n");
 
diff --git a/tests/downloads-view.test.tsx b/tests/downloads-view.test.tsx
index b139fc5..1409916 100644
--- a/tests/downloads-view.test.tsx
+++ b/tests/downloads-view.test.tsx
@@ -709,7 +709,11 @@ describe("downloads view", () => {
     const css = readFileSync(new URL("../src/renderer/views/downloads/downloads.css", import.meta.url), "utf8");
     const source = readFileSync(new URL("../src/renderer/views/downloads/DownloadsTable.tsx", import.meta.url), "utf8");
 
-    expect(css).toMatch(/\.downloads-item-row\.is-selected,\s*\.downloads-package-card\.is-selected\s*>\s*\.downloads-package-row\s*\{[^}]*background:\s*color-mix\(in srgb, var\(--ui-success\) 14%, var\(--ui-canvas\)\);[^}]*box-shadow:\s*inset 3px 0 0 var\(--ui-success\);/s);
+    expect(css).toMatch(/\.downloads-item-row,\s*\.downloads-package-row\s*\{[^}]*border-left:\s*3px solid transparent;/s);
+    expect(css).toMatch(/\.downloads-item-row\.is-selected,\s*\.downloads-package-card\.is-selected\s*>\s*\.downloads-package-row\s*\{[^}]*background:\s*color-mix\(in srgb, var\(--ui-success\) 14%, var\(--ui-canvas\)\);[^}]*border-left-color:\s*var\(--ui-success\);/s);
+    expect(css).toMatch(/\.downloads-item-row\.is-selected::before\s*\{[^}]*content:\s*"";[^}]*position:\s*absolute;[^}]*inset:\s*-1px auto -1px -3px;[^}]*width:\s*3px;[^}]*background:\s*var\(--ui-success\);/s);
+    expect(css).toMatch(/\.downloads-package-card\.is-selected::before\s*\{[^}]*content:\s*"";[^}]*position:\s*absolute;[^}]*inset:\s*0 auto auto 0;[^}]*width:\s*3px;[^}]*height:\s*41px;[^}]*background:\s*var\(--ui-success\);/s);
+    expect(css).toMatch(/\.downloads-package-card:has\(\.downloads-package-items-inner\s*>\s*\.downloads-item-row:last-child\.is-selected\)::after\s*\{[^}]*content:\s*"";[^}]*position:\s*absolute;[^}]*inset:\s*auto auto -1px 0;[^}]*width:\s*3px;[^}]*height:\s*1px;[^}]*background:\s*var\(--ui-success\);/s);
     expect(css).toMatch(/\.downloads-selection-cell\s+input\[type="checkbox"\]\s*\{[^}]*width:\s*18px;[^}]*height:\s*18px;/s);
     expect(css).toMatch(/\.downloads-hoster-icon\s*\{[^}]*width:\s*18px;[^}]*height:\s*18px;[^}]*object-fit:\s*contain;/s);
     expect(css).toMatch(/\.downloads-hoster-icon\[data-hoster="rapidgator"\]\s*\{[^}]*transform:\s*translateY\(-4px\) scale\(2\);/s);
@@ -996,12 +1000,39 @@ describe("download table row contracts", () => {
     expect(calls).toEqual(["select"]);
   });
 
-  it("only collapses a package through its visible disclosure button", () => {
+  it("selects a package on a plain row click", () => {
+    const calls: Array<[string, boolean, boolean]> = [];
+    const model = withRuntime(createInput());
+    const row = model.packageRows[0];
+    const component = PackageCardContent({
+      actions: createActions({
+        onToggleSelection: (id, ctrl, shift) => calls.push([id, ctrl, shift])
+      }),
+      columnOrder: model.columnOrder,
+      editing: false,
+      editingName: "",
+      gridTemplate: model.gridTemplate,
+      packageSpeedBps: 0,
+      row,
+      selectedIds: new Set<string>(),
+      selectedVersion: 1
+    });
+    const packageRow = findElement(component, (element) => element.props["data-download-row-id"] === row.package.id);
+
+    packageRow.props.onClick({ ctrlKey: false, metaKey: false, shiftKey: false });
+
+    expect(calls).toEqual([[row.package.id, false, false]]);
+  });
+
+  it("collapses a package through its disclosure button or a free-row double click", () => {
     const calls: string[] = [];
     const model = withRuntime(createInput());
     const row = model.packageRows[0];
     const component = PackageCardContent({
-      actions: createActions({ onTogglePackageCollapse: () => calls.push("collapse") }),
+      actions: createActions({
+        onTogglePackageCollapse: () => calls.push("collapse"),
+        onToggleSelection: () => calls.push("select")
+      }),
       columnOrder: model.columnOrder,
       editing: false,
       editingName: "",
@@ -1014,14 +1045,95 @@ describe("download table row contracts", () => {
     const packageRow = findElement(component, (element) => element.props["data-download-row-id"] === row.package.id);
     const collapseButton = findElement(component, (element) => element.type === "button" && String(element.props.className || "").includes("downloads-collapse-button"));
 
-    packageRow.props.onClick({ ctrlKey: false, metaKey: false, shiftKey: false, target: {}, currentTarget: {} });
+    packageRow.props.onClick({ ctrlKey: false, detail: 1, metaKey: false, shiftKey: false, target: {}, currentTarget: {} });
+    packageRow.props.onClick({ ctrlKey: false, detail: 2, metaKey: false, shiftKey: false, target: {}, currentTarget: {} });
+    expect(packageRow.props.onDoubleClick).toBeTypeOf("function");
+    packageRow.props.onDoubleClick({
+      ctrlKey: false,
+      currentTarget: {},
+      metaKey: false,
+      preventDefault: () => calls.push("prevent"),
+      shiftKey: false,
+      target: { closest: () => null }
+    });
     collapseButton.props.onClick({ stopPropagation: () => {} });
 
-    expect(calls).toEqual(["collapse"]);
+    expect(calls).toEqual(["select", "prevent", "collapse", "collapse"]);
     expect(collapseButton.props["aria-expanded"]).toBe(true);
     expect(collapseButton.props["aria-controls"]).toBe(`downloads-package-items-${row.package.id}`);
   });
 
+  it("does not collapse a package when a row double click starts on interactive content", () => {
+    const calls: string[] = [];
+    const model = withRuntime(createInput());
+    const row = model.packageRows[0];
+    const component = PackageCardContent({
+      actions: createActions({
+        onStartPackageRename: () => calls.push("rename"),
+        onTogglePackageCollapse: () => calls.push("collapse"),
+        onToggleSelection: () => calls.push("select")
+      }),
+      columnOrder: model.columnOrder,
+      editing: false,
+      editingName: "",
+      gridTemplate: model.gridTemplate,
+      packageSpeedBps: 0,
+      row,
+      selectedIds: new Set<string>(),
+      selectedVersion: 1
+    });
+    const packageRow = findElement(component, (element) => element.props["data-download-row-id"] === row.package.id);
+    const title = findElement(component, (element) => element.type === "strong" && String(element.props.className || "").includes("downloads-copyable"));
+
+    packageRow.props.onClick({ ctrlKey: false, detail: 1, metaKey: false, shiftKey: false });
+    packageRow.props.onClick({ ctrlKey: false, detail: 2, metaKey: false, shiftKey: false });
+    expect(packageRow.props.onDoubleClick).toBeTypeOf("function");
+    packageRow.props.onDoubleClick({
+      ctrlKey: false,
+      currentTarget: {},
+      metaKey: false,
+      preventDefault: () => calls.push("prevent"),
+      shiftKey: false,
+      target: { closest: () => ({}) }
+    });
+    title.props.onDoubleClick({ stopPropagation: () => calls.push("stop") });
+
+    expect(calls).toEqual(["select", "stop", "rename"]);
+  });
+
+  it("keeps an already selected package selected during a row double click", () => {
+    const calls: string[] = [];
+    const model = withRuntime(createInput());
+    const row = model.packageRows[0];
+    const component = PackageCardContent({
+      actions: createActions({
+        onTogglePackageCollapse: () => calls.push("collapse"),
+        onToggleSelection: () => calls.push("select")
+      }),
+      columnOrder: model.columnOrder,
+      editing: false,
+      editingName: "",
+      gridTemplate: model.gridTemplate,
+      packageSpeedBps: 0,
+      row,
+      selectedIds: new Set([row.package.id]),
+      selectedVersion: 1
+    });
+    const packageRow = findElement(component, (element) => element.props["data-download-row-id"] === row.package.id);
+
+    packageRow.props.onClick({ ctrlKey: false, detail: 1, metaKey: false, shiftKey: false });
+    packageRow.props.onClick({ ctrlKey: false, detail: 2, metaKey: false, shiftKey: false });
+    packageRow.props.onDoubleClick({
+      ctrlKey: false,
+      metaKey: false,
+      preventDefault: () => calls.push("prevent"),
+      shiftKey: false,
+      target: { closest: () => null }
+    });
+
+    expect(calls).toEqual(["prevent", "collapse"]);
+  });
+
   it("keeps the complete package status and audio details in the tooltip", () => {
     const audioPackage = {
       ...pkg("audio-package", "Audio package", ["audio-item"]),
diff --git a/tests/responsive-ui.test.tsx b/tests/responsive-ui.test.tsx
index 5ce7606..ab22b42 100644
--- a/tests/responsive-ui.test.tsx
+++ b/tests/responsive-ui.test.tsx
@@ -46,7 +46,7 @@ describe("responsive shell mode", () => {
     expect(html).toContain("md-shell is-full");
     expect(css).toContain(".md-shell.is-compact");
     expect(css).toContain(".md-shell.is-minimum");
-    expect(css).toMatch(/grid-template-columns:\s*56px minmax\(0,\s*1fr\)/);
+    expect(css).toMatch(/\.md-shell\.has-collapsed-sidebar \.md-shell-workspace\s*\{[^}]*grid-template-columns:\s*0 minmax\(0,\s*1fr\);/s);
   });
 
   it("keeps responsive rail content hidden behind a visible expand control", () => {