diff --git a/frontend/components/dashboard/Dashboard.module.css b/frontend/components/dashboard/Dashboard.module.css
index 675bdb0b..a0202ee2 100644
--- a/frontend/components/dashboard/Dashboard.module.css
+++ b/frontend/components/dashboard/Dashboard.module.css
@@ -3107,6 +3107,33 @@
   transform: translateX(0);
 }
 
+.root :global(.scan-terminal > .detail-panel.scan-city-detail-rail) {
+  position: relative;
+  inset: auto;
+  width: auto;
+  min-width: 0;
+  height: auto;
+  min-height: calc(100vh - 32px);
+  z-index: auto;
+  transform: none;
+  transition: none;
+  border: 1px solid rgba(82, 114, 161, 0.18);
+  border-left: 1px solid rgba(82, 114, 161, 0.18);
+  border-radius: 22px;
+  background: linear-gradient(180deg, rgba(15, 28, 47, 0.94), rgba(9, 18, 32, 0.94));
+  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
+  backdrop-filter: blur(14px);
+  align-self: stretch;
+}
+
+.root :global(.scan-terminal > .detail-panel.scan-city-detail-rail.visible) {
+  transform: none;
+}
+
+.root :global(.scan-city-detail-rail .panel-header) {
+  padding: 20px 16px 16px;
+}
+
 .root :global(.panel-header) {
   padding: 20px 20px 16px;
   border-bottom: 1px solid var(--border-subtle);
@@ -10565,6 +10592,11 @@
     grid-template-columns: 240px minmax(0, 1fr);
   }
 
+  .root :global(.scan-terminal > .detail-panel.scan-city-detail-rail) {
+    grid-column: 1 / -1;
+    min-height: auto;
+  }
+
   .root :global(.scan-detail-panel) {
     grid-column: 1 / -1;
     min-height: auto;
@@ -10578,7 +10610,8 @@
 
   .root :global(.scan-filter-panel),
   .root :global(.scan-data-grid),
-  .root :global(.scan-detail-panel) {
+  .root :global(.scan-detail-panel),
+  .root :global(.scan-terminal > .detail-panel.scan-city-detail-rail) {
     min-height: auto;
   }
 
diff --git a/frontend/components/dashboard/DetailPanel.tsx b/frontend/components/dashboard/DetailPanel.tsx
index 6c38bd41..5e4db4f4 100644
--- a/frontend/components/dashboard/DetailPanel.tsx
+++ b/frontend/components/dashboard/DetailPanel.tsx
@@ -130,10 +130,15 @@ function DetailMiniTemperatureChart({ detail }: { detail: CityDetail }) {
   );
 }
 
-export function DetailPanel() {
+export function DetailPanel({
+  variant = "overlay",
+}: {
+  variant?: "overlay" | "rail";
+} = {}) {
   const store = useDashboardStore();
   const { locale, t } = useI18n();
   const router = useRouter();
+  const isRail = variant === "rail";
   const detail = store.selectedDetail;
   const selectedCityItem = useMemo(
     () =>
@@ -155,8 +160,9 @@ export function DetailPanel() {
   const [heavyContentReady, setHeavyContentReady] = useState(false);
   const isOverlayOpen =
     Boolean(store.futureModalDate) || store.historyState.isOpen;
-  const isVisible =
-    store.isPanelOpen && Boolean(store.selectedCity) && !isOverlayOpen;
+  const isVisible = isRail
+    ? Boolean(store.selectedCity) && !isOverlayOpen
+    : store.isPanelOpen && Boolean(store.selectedCity) && !isOverlayOpen;
   const hasBasicPanelContent = Boolean(
     detail || selectedSummary || selectedCityItem,
   );
@@ -311,20 +317,26 @@ export function DetailPanel() {
   return (
     <aside
       ref={panelRef}
-      className={clsx("detail-panel", isVisible && "visible")}
+      className={clsx(
+        "detail-panel",
+        isRail && "scan-city-detail-rail",
+        (isVisible || isRail) && "visible",
+      )}
     >
       <div className="panel-header">
-        <button
-          type="button"
-          className="panel-close"
-          aria-label={t("detail.closeAria")}
-          onClick={() => {
-            blurActiveElement();
-            store.closePanel();
-          }}
-        >
-          ×
-        </button>
+        {!isRail ? (
+          <button
+            type="button"
+            className="panel-close"
+            aria-label={t("detail.closeAria")}
+            onClick={() => {
+              blurActiveElement();
+              store.closePanel();
+            }}
+          >
+            ×
+          </button>
+        ) : null}
         <div className="panel-title-area">
           <div className="panel-title-stack">
             <div className="panel-overline">
diff --git a/frontend/components/dashboard/FutureForecastModal.tsx b/frontend/components/dashboard/FutureForecastModal.tsx
index af1bfa5f..13cd7431 100644
--- a/frontend/components/dashboard/FutureForecastModal.tsx
+++ b/frontend/components/dashboard/FutureForecastModal.tsx
@@ -41,6 +41,8 @@ import type {
   MarketScan,
 } from "@/lib/dashboard-types";
 
+const TODAY_MARKET_SCAN_AUTO_REFRESH_MS = 5 * 60 * 1000;
+
 function normalizeMarketValue(value?: number | null) {
   if (value == null) return null;
   const numeric = Number(value);
@@ -830,7 +832,7 @@ function FutureForecastModalContent({
         return;
       }
       refreshMarketScan();
-    }, 30_000);
+    }, TODAY_MARKET_SCAN_AUTO_REFRESH_MS);
 
     return () => {
       cancelled = true;
diff --git a/frontend/components/dashboard/ScanTerminalDashboard.tsx b/frontend/components/dashboard/ScanTerminalDashboard.tsx
index e8bded36..bbf567f2 100644
--- a/frontend/components/dashboard/ScanTerminalDashboard.tsx
+++ b/frontend/components/dashboard/ScanTerminalDashboard.tsx
@@ -68,6 +68,8 @@ const DEFAULT_FILTERS: FilterState = {
   limit: 28,
 };
 
+const SCAN_AUTO_REFRESH_MS = 5 * 60 * 1000;
+
 type ContentView = "list" | "map" | "calendar";
 type ThemeMode = "dark" | "light";
 type AssistantMessage = {
@@ -1223,8 +1225,6 @@ function ScanTerminalScreen() {
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState<string | null>(null);
   const [selectedRowId, setSelectedRowId] = useState<string | null>(null);
-  const [detailByRowId, setDetailByRowId] = useState<Record<string, MarketScan | null>>({});
-  const [detailLoadingId, setDetailLoadingId] = useState<string | null>(null);
   const [activeView, setActiveView] = useState<ContentView>("list");
   const [mapSelectedCityName, setMapSelectedCityName] = useState<string | null>(null);
   const [userLocalTime, setUserLocalTime] = useState("--");
@@ -1357,30 +1357,6 @@ function ScanTerminalScreen() {
     }
   };
 
-  const fetchDetail = async (row: ScanOpportunityRow) => {
-    if (!row.market_slug || !row.selected_date || row.closed) return;
-    if (detailByRowId[row.id] !== undefined) return;
-    setDetailLoadingId(row.id);
-    try {
-      const response = await dashboardClient.getCityMarketScan(row.city, {
-        force: false,
-        marketSlug: row.market_slug,
-        targetDate: row.selected_date,
-      });
-      setDetailByRowId((current) => ({
-        ...current,
-        [row.id]: response.market_scan || null,
-      }));
-    } catch {
-      setDetailByRowId((current) => ({
-        ...current,
-        [row.id]: null,
-      }));
-    } finally {
-      setDetailLoadingId((current) => (current === row.id ? null : current));
-    }
-  };
-
   useEffect(() => {
     void fetchTerminal(DEFAULT_FILTERS, false);
   }, []);
@@ -1388,7 +1364,7 @@ function ScanTerminalScreen() {
   useEffect(() => {
     const intervalId = window.setInterval(() => {
       void fetchTerminal(activeFilters, false);
-    }, 30_000);
+    }, SCAN_AUTO_REFRESH_MS);
     return () => window.clearInterval(intervalId);
   }, [activeFilters]);
 
@@ -1417,18 +1393,16 @@ function ScanTerminalScreen() {
     resolvedView === "map" && mapFocusedCity
       ? mapFocusedRow || mapFallbackRow
       : selectedRow;
-  const selectedDetail = activeDetailRow ? detailByRowId[activeDetailRow.id] : null;
   const scanStatus = terminalData?.status || (loading ? "loading" : error ? "failed" : "ready");
   const staleReason =
     terminalData?.stale_reason || error || null;
 
   useEffect(() => {
     if (!activeDetailRow) return;
-    void fetchDetail(activeDetailRow);
     if (!store.cityDetailsByName[activeDetailRow.city]) {
       void store.ensureCityDetail(activeDetailRow.city, false, "panel").catch(() => {});
     }
-  }, [activeDetailRow, detailByRowId]);
+  }, [activeDetailRow, store.cityDetailsByName, store.ensureCityDetail]);
 
   const handleMapCitySelect = useCallback((cityName: string) => {
     setMapSelectedCityName(cityName);
@@ -1618,19 +1592,7 @@ function ScanTerminalScreen() {
           </section>
         </main>
 
-        <ScanOpportunityDetailPanel
-          row={activeDetailRow}
-          marketScan={selectedDetail}
-          loading={detailLoadingId === activeDetailRow?.id}
-        />
-        <CityDetailPanel />
-        <AssistantWidget
-          terminalData={terminalData}
-          rows={timeSortedRows}
-          selectedRow={activeDetailRow}
-          locale={locale}
-          totalCities={store.cities.length}
-        />
+        <CityDetailPanel variant="rail" />
       </div>
     </div>
   );