diff --git a/apps/web/src/components/timeline/AllocationPopover.tsx b/apps/web/src/components/timeline/AllocationPopover.tsx
index 96244e7..cfd569a 100644
--- a/apps/web/src/components/timeline/AllocationPopover.tsx
+++ b/apps/web/src/components/timeline/AllocationPopover.tsx
@@ -2,6 +2,7 @@
 
 import { clsx } from "clsx";
 import { useEffect, useRef, useState } from "react";
+import { createPortal } from "react-dom";
 import type { AllocationLike, AllocationReadModel, Assignment } from "@capakraken/shared";
 import { trpc } from "~/lib/trpc/client.js";
 import { useInvalidateTimeline } from "~/hooks/useInvalidatePlanningViews.js";
@@ -89,16 +90,17 @@ export function AllocationPopover({
   }
 
   if (isLoading || !allocation) {
-    return (
+    const loadingPopover = (
       <div ref={ref} style={style} className="bg-white border border-gray-200 rounded-xl shadow-xl p-4 text-sm text-gray-500">
         Loading...
       </div>
     );
+    return typeof document === "undefined" ? loadingPopover : createPortal(loadingPopover, document.body);
   }
 
   const dailyCostEUR = ((hoursPerDay ?? allocation.hoursPerDay) * (allocation.resource?.lcrCents ?? 0) / 100).toFixed(2);
 
-  return (
+  const popover = (
     <div
       ref={ref}
       style={style}
@@ -211,4 +213,6 @@ export function AllocationPopover({
       </div>
     </div>
   );
+
+  return typeof document === "undefined" ? popover : createPortal(popover, document.body);
 }
diff --git a/apps/web/src/components/timeline/BatchAssignPopover.tsx b/apps/web/src/components/timeline/BatchAssignPopover.tsx
index 034a321..5dd8f84 100644
--- a/apps/web/src/components/timeline/BatchAssignPopover.tsx
+++ b/apps/web/src/components/timeline/BatchAssignPopover.tsx
@@ -2,6 +2,7 @@
 
 import { clsx } from "clsx";
 import { useEffect, useRef, useState } from "react";
+import { createPortal } from "react-dom";
 import { AllocationStatus } from "@capakraken/shared";
 import { trpc } from "~/lib/trpc/client.js";
 import { useInvalidateTimeline } from "~/hooks/useInvalidatePlanningViews.js";
@@ -96,7 +97,7 @@ export function BatchAssignPopover({
   const canAssign =
     !!selectedProjectId && resourceIds.length > 0 && hoursPerDay > 0;
 
-  return (
+  const popover = (
     <div
       ref={ref}
       className="fixed top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 z-[60] w-[360px] bg-white dark:bg-gray-800 border border-gray-200 dark:border-gray-700 rounded-xl shadow-2xl dark:shadow-black/40 overflow-hidden"
@@ -254,4 +255,6 @@ export function BatchAssignPopover({
       </div>
     </div>
   );
+
+  return typeof document === "undefined" ? popover : createPortal(popover, document.body);
 }
diff --git a/apps/web/src/components/timeline/DemandPopover.tsx b/apps/web/src/components/timeline/DemandPopover.tsx
index 42fe775..eeed6f5 100644
--- a/apps/web/src/components/timeline/DemandPopover.tsx
+++ b/apps/web/src/components/timeline/DemandPopover.tsx
@@ -1,5 +1,6 @@
 "use client";
 
+import { createPortal } from "react-dom";
 import type { TimelineDemandEntry } from "./TimelineContext.js";
 import { formatCents, formatDateLong } from "~/lib/format.js";
 import { useViewportPopover } from "~/hooks/useViewportPopover.js";
@@ -36,7 +37,7 @@ export function DemandPopover({
   const totalHours = demand.hoursPerDay * days;
   const budgetCents = demand.dailyCostCents * days;
 
-  return (
+  const popover = (
     <div
       ref={ref}
       style={style}
@@ -171,4 +172,6 @@ export function DemandPopover({
       </div>
     </div>
   );
+
+  return typeof document === "undefined" ? popover : createPortal(popover, document.body);
 }
diff --git a/apps/web/src/components/timeline/NewAllocationPopover.tsx b/apps/web/src/components/timeline/NewAllocationPopover.tsx
index c58e29b..1e1f27c 100644
--- a/apps/web/src/components/timeline/NewAllocationPopover.tsx
+++ b/apps/web/src/components/timeline/NewAllocationPopover.tsx
@@ -2,6 +2,7 @@
 
 import { clsx } from "clsx";
 import { useEffect, useRef, useState } from "react";
+import { createPortal } from "react-dom";
 import { AllocationStatus } from "@capakraken/shared";
 import { trpc } from "~/lib/trpc/client.js";
 import { useInvalidateTimeline } from "~/hooks/useInvalidatePlanningViews.js";
@@ -88,7 +89,7 @@ export function NewAllocationPopover({
 
   const canCreate = !!selectedProjectId && !!start && !!end && hoursPerDay > 0;
 
-  return (
+  const popover = (
     <div
       ref={ref}
       style={style}
@@ -238,4 +239,6 @@ export function NewAllocationPopover({
       </div>
     </div>
   );
+
+  return typeof document === "undefined" ? popover : createPortal(popover, document.body);
 }
diff --git a/apps/web/src/components/timeline/ResourceHoverCard.tsx b/apps/web/src/components/timeline/ResourceHoverCard.tsx
index f69539e..b759772 100644
--- a/apps/web/src/components/timeline/ResourceHoverCard.tsx
+++ b/apps/web/src/components/timeline/ResourceHoverCard.tsx
@@ -1,5 +1,6 @@
 "use client";
 
+import { createPortal } from "react-dom";
 import { trpc } from "~/lib/trpc/client.js";
 import { formatCents } from "~/lib/format.js";
 import type { SkillEntry } from "@capakraken/shared";
@@ -33,7 +34,7 @@ export function ResourceHoverCard({ resourceId, anchorEl, onClose }: ResourceHov
     .sort((a, b) => b.proficiency - a.proficiency)
     .slice(0, 6);
 
-  return (
+  const hoverCard = (
     <div
       ref={ref}
       data-resource-hover-card="true"
@@ -160,4 +161,6 @@ export function ResourceHoverCard({ resourceId, anchorEl, onClose }: ResourceHov
       )}
     </div>
   );
+
+  return typeof document === "undefined" ? hoverCard : createPortal(hoverCard, document.body);
 }