diff --git a/apps/client/src/features/base/components/base-view.tsx b/apps/client/src/features/base/components/base-view.tsx
index 9e1773a2d..66bd950d1 100644
--- a/apps/client/src/features/base/components/base-view.tsx
+++ b/apps/client/src/features/base/components/base-view.tsx
@@ -39,6 +39,8 @@ import { BaseToolbar } from "@/features/base/components/base-toolbar";
 import { BaseViewDraftBanner } from "@/features/base/components/base-view-draft-banner";
 import { BaseTableSkeleton } from "@/features/base/components/base-table-skeleton";
 import { ViewRenderer } from "@/features/base/components/views/view-renderer";
+import { useRowDetailModal } from "@/features/base/hooks/use-row-detail-modal";
+import { RowDetailModal } from "@/features/base/components/row-detail-modal/row-detail-modal";
 import classes from "@/features/base/styles/grid.module.css";
 
 type BaseViewProps = {
@@ -267,12 +269,11 @@ export function BaseView({ pageId, embedded }: BaseViewProps) {
     updateViewMutation,
   ]);
 
-  const handleCardClick = useCallback((rowId: string) => {
-    // Phase 5 wires this to the URL-driven row detail modal.
-    // Until then, noop — the click still registers and the focus ring
-    // appears, but nothing opens.
-    void rowId;
-  }, []);
+  const { openRowId, openRow, closeRow } = useRowDetailModal();
+  const handleCardClick = useCallback(
+    (rowId: string) => openRow(rowId),
+    [openRow],
+  );
 
   const handleRowReorder = useCallback(
     (rowId: string, targetRowId: string, dropPosition: "above" | "below") => {
@@ -350,44 +351,7 @@ export function BaseView({ pageId, embedded }: BaseViewProps) {
     // Inline: banner + toolbar live inside the StickyBand (passed via
     // stickyBandPrelude). The page is the vertical scroll container.
     return (
-      <ViewRenderer
-        base={base}
-        rows={rows}
-        effectiveView={effectiveView}
-        table={table}
-        pageId={pageId}
-        embedded={embedded}
-        hasNextPage={!!hasNextPage}
-        isFetchingNextPage={isFetchingNextPage}
-        onFetchNextPage={fetchNextPage}
-        onCellUpdate={handleCellUpdate}
-        onAddRow={handleAddRow}
-        onColumnReorder={handleColumnReorder}
-        onResizeEnd={handleResizeEnd}
-        onRowReorder={handleRowReorder}
-        onCardClick={handleCardClick}
-        persistViewConfig={persistViewConfig}
-        scrollportRef={scrollportRef}
-        stickyBandPrelude={
-          <>
-            {banner}
-            {toolbar}
-          </>
-        }
-      />
-    );
-  }
-
-  // Standalone: banner + toolbar sit above the .tableScrollport, which
-  // is the vertical scroll container. StickyBand inside contains only
-  // the column-header row.
-  return (
-    <div
-      style={{ display: "flex", flexDirection: "column", height: "100%" }}
-    >
-      {banner}
-      {toolbar}
-      <div className={classes.tableScrollport} ref={scrollportRef}>
+      <>
         <ViewRenderer
           base={base}
           rows={rows}
@@ -406,8 +370,61 @@ export function BaseView({ pageId, embedded }: BaseViewProps) {
           onCardClick={handleCardClick}
           persistViewConfig={persistViewConfig}
           scrollportRef={scrollportRef}
+          stickyBandPrelude={
+            <>
+              {banner}
+              {toolbar}
+            </>
+          }
         />
+        <RowDetailModal
+          base={base}
+          rows={rows}
+          openRowId={openRowId}
+          onClose={closeRow}
+        />
+      </>
+    );
+  }
+
+  // Standalone: banner + toolbar sit above the .tableScrollport, which
+  // is the vertical scroll container. StickyBand inside contains only
+  // the column-header row.
+  return (
+    <>
+      <div
+        style={{ display: "flex", flexDirection: "column", height: "100%" }}
+      >
+        {banner}
+        {toolbar}
+        <div className={classes.tableScrollport} ref={scrollportRef}>
+          <ViewRenderer
+            base={base}
+            rows={rows}
+            effectiveView={effectiveView}
+            table={table}
+            pageId={pageId}
+            embedded={embedded}
+            hasNextPage={!!hasNextPage}
+            isFetchingNextPage={isFetchingNextPage}
+            onFetchNextPage={fetchNextPage}
+            onCellUpdate={handleCellUpdate}
+            onAddRow={handleAddRow}
+            onColumnReorder={handleColumnReorder}
+            onResizeEnd={handleResizeEnd}
+            onRowReorder={handleRowReorder}
+            onCardClick={handleCardClick}
+            persistViewConfig={persistViewConfig}
+            scrollportRef={scrollportRef}
+          />
+        </div>
       </div>
-    </div>
+      <RowDetailModal
+        base={base}
+        rows={rows}
+        openRowId={openRowId}
+        onClose={closeRow}
+      />
+    </>
   );
 }
diff --git a/apps/client/src/features/base/components/row-detail-modal/row-detail-modal.tsx b/apps/client/src/features/base/components/row-detail-modal/row-detail-modal.tsx
new file mode 100644
index 000000000..272f247fa
--- /dev/null
+++ b/apps/client/src/features/base/components/row-detail-modal/row-detail-modal.tsx
@@ -0,0 +1,74 @@
+import { Modal, Stack, Text } from "@mantine/core";
+import { useTranslation } from "react-i18next";
+import { useEffect, useMemo } from "react";
+import {
+  IBase,
+  IBaseRow,
+} from "@/features/base/types/base.types";
+import { useUpdateRowMutation } from "@/features/base/queries/base-row-query";
+import { RowDetailTitle } from "./row-detail-title";
+
+type RowDetailModalProps = {
+  base: IBase;
+  rows: IBaseRow[];
+  openRowId: string | null;
+  onClose: () => void;
+};
+
+export function RowDetailModal({
+  base,
+  rows,
+  openRowId,
+  onClose,
+}: RowDetailModalProps) {
+  const { t } = useTranslation();
+  const updateRowMutation = useUpdateRowMutation();
+
+  const row = useMemo(
+    () => (openRowId ? rows.find((r) => r.id === openRowId) : undefined),
+    [openRowId, rows],
+  );
+  const primaryProperty = useMemo(
+    () => base.properties.find((p) => p.isPrimary),
+    [base.properties],
+  );
+
+  // If a row was open and disappeared (deleted, filtered out, or not yet
+  // loaded into the rows page), close the modal.
+  const wasOpen = !!openRowId && !row;
+  useEffect(() => {
+    if (wasOpen) onClose();
+  }, [wasOpen, onClose]);
+
+  return (
+    <Modal
+      opened={!!row}
+      onClose={onClose}
+      size="lg"
+      withCloseButton
+      centered
+      title={null}
+    >
+      {row ? (
+        <Stack gap="md">
+          <RowDetailTitle
+            row={row}
+            primaryProperty={primaryProperty}
+            onCommit={(value) => {
+              if (!primaryProperty) return;
+              updateRowMutation.mutate({
+                rowId: row.id,
+                pageId: base.id,
+                cells: { [primaryProperty.id]: value },
+              });
+            }}
+          />
+          {/* Property list goes here in Task 19 */}
+          {/* Add-property button goes here in Task 20 */}
+        </Stack>
+      ) : (
+        <Text c="dimmed">{t("Loading…")}</Text>
+      )}
+    </Modal>
+  );
+}
diff --git a/apps/client/src/features/base/components/row-detail-modal/row-detail-title.tsx b/apps/client/src/features/base/components/row-detail-modal/row-detail-title.tsx
new file mode 100644
index 000000000..114d6bfa5
--- /dev/null
+++ b/apps/client/src/features/base/components/row-detail-modal/row-detail-title.tsx
@@ -0,0 +1,47 @@
+import { useEffect, useState } from "react";
+import { TextInput } from "@mantine/core";
+import { useTranslation } from "react-i18next";
+import { IBaseProperty, IBaseRow } from "@/features/base/types/base.types";
+
+type RowDetailTitleProps = {
+  row: IBaseRow;
+  primaryProperty: IBaseProperty | undefined;
+  onCommit: (value: string) => void;
+};
+
+export function RowDetailTitle({
+  row,
+  primaryProperty,
+  onCommit,
+}: RowDetailTitleProps) {
+  const { t } = useTranslation();
+  const initial = primaryProperty
+    ? (((row.cells ?? {})[primaryProperty.id] as string) ?? "")
+    : "";
+  const [value, setValue] = useState(initial);
+
+  // Re-sync if the underlying row changes (e.g. another client updated it).
+  useEffect(() => {
+    setValue(initial);
+  }, [initial]);
+
+  return (
+    <TextInput
+      autoFocus
+      placeholder={t("Untitled")}
+      value={value}
+      variant="unstyled"
+      size="xl"
+      onChange={(e) => setValue(e.currentTarget.value)}
+      onBlur={() => {
+        if (value !== initial) onCommit(value);
+      }}
+      onKeyDown={(e) => {
+        if (e.key === "Enter") {
+          e.preventDefault();
+          (e.currentTarget as HTMLInputElement).blur();
+        }
+      }}
+    />
+  );
+}