diff --git a/src/lib/api/mutations/crew.mutations.ts b/src/lib/api/mutations/crew.mutations.ts
new file mode 100644
index 00000000..82ad25e1
--- /dev/null
+++ b/src/lib/api/mutations/crew.mutations.ts
@@ -0,0 +1,258 @@
+/**
+ * Crew Mutation Configurations
+ *
+ * Provides mutation configurations for crew CRUD operations
+ * with cache invalidation using TanStack Query v6.
+ *
+ * @module api/mutations/crew
+ */
+
+import { useQueryClient, createMutation } from '@tanstack/svelte-query'
+import { crewAdapter } from '$lib/api/adapters/crew.adapter'
+import { crewKeys } from '$lib/api/queries/crew.queries'
+import type {
+  CreateCrewInput,
+  UpdateCrewInput,
+  CreatePhantomPlayerInput,
+  UpdatePhantomPlayerInput,
+  UpdateMembershipInput
+} from '$lib/types/api/crew'
+
+// ==================== Crew Mutations ====================
+
+/**
+ * Create crew mutation
+ */
+export function useCreateCrew() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: (input: CreateCrewInput) => crewAdapter.create(input),
+    onSuccess: (crew) => {
+      queryClient.setQueryData(crewKeys.myCrew(), crew)
+      queryClient.invalidateQueries({ queryKey: crewKeys.invitations.pending() })
+    }
+  }))
+}
+
+/**
+ * Update crew mutation
+ */
+export function useUpdateCrew() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: (input: UpdateCrewInput) => crewAdapter.update(input),
+    onSuccess: (crew) => {
+      queryClient.setQueryData(crewKeys.myCrew(), crew)
+    }
+  }))
+}
+
+/**
+ * Leave crew mutation
+ */
+export function useLeaveCrew() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: () => crewAdapter.leave(),
+    onSuccess: () => {
+      queryClient.removeQueries({ queryKey: crewKeys.myCrew() })
+      queryClient.removeQueries({ queryKey: crewKeys.membersAll() })
+    }
+  }))
+}
+
+/**
+ * Transfer captain mutation
+ */
+export function useTransferCaptain() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({ crewId, userId }: { crewId: string; userId: string }) =>
+      crewAdapter.transferCaptain(crewId, userId),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: crewKeys.myCrew() })
+      queryClient.invalidateQueries({ queryKey: crewKeys.membersAll() })
+    }
+  }))
+}
+
+// ==================== Membership Mutations ====================
+
+/**
+ * Update membership (promote/demote or update joined_at) mutation
+ */
+export function useUpdateMembership() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({
+      crewId,
+      membershipId,
+      input
+    }: {
+      crewId: string
+      membershipId: string
+      input: UpdateMembershipInput
+    }) => crewAdapter.updateMembership(crewId, membershipId, input),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: crewKeys.membersAll() })
+    }
+  }))
+}
+
+/**
+ * Remove member mutation
+ */
+export function useRemoveMember() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({ crewId, membershipId }: { crewId: string; membershipId: string }) =>
+      crewAdapter.removeMember(crewId, membershipId),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: crewKeys.membersAll() })
+      queryClient.invalidateQueries({ queryKey: crewKeys.myCrew() })
+    }
+  }))
+}
+
+// ==================== Invitation Mutations ====================
+
+/**
+ * Send invitation mutation
+ */
+export function useSendInvitation() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({ crewId, userId }: { crewId: string; userId: string }) =>
+      crewAdapter.sendInvitation(crewId, userId),
+    onSuccess: (_invitation, { crewId }) => {
+      queryClient.invalidateQueries({ queryKey: crewKeys.crewInvitations(crewId) })
+    }
+  }))
+}
+
+/**
+ * Accept invitation mutation
+ */
+export function useAcceptInvitation() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: (invitationId: string) => crewAdapter.acceptInvitation(invitationId),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: crewKeys.myCrew() })
+      queryClient.invalidateQueries({ queryKey: crewKeys.invitations.pending() })
+    }
+  }))
+}
+
+/**
+ * Reject invitation mutation
+ */
+export function useRejectInvitation() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: (invitationId: string) => crewAdapter.rejectInvitation(invitationId),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: crewKeys.invitations.pending() })
+    }
+  }))
+}
+
+// ==================== Phantom Player Mutations ====================
+
+/**
+ * Create phantom player mutation
+ */
+export function useCreatePhantom() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({ crewId, input }: { crewId: string; input: CreatePhantomPlayerInput }) =>
+      crewAdapter.createPhantom(crewId, input),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: crewKeys.membersAll() })
+    }
+  }))
+}
+
+/**
+ * Update phantom player mutation
+ */
+export function useUpdatePhantom() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({
+      crewId,
+      phantomId,
+      input
+    }: {
+      crewId: string
+      phantomId: string
+      input: UpdatePhantomPlayerInput
+    }) => crewAdapter.updatePhantom(crewId, phantomId, input),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: crewKeys.membersAll() })
+    }
+  }))
+}
+
+/**
+ * Delete phantom player mutation
+ */
+export function useDeletePhantom() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({ crewId, phantomId }: { crewId: string; phantomId: string }) =>
+      crewAdapter.deletePhantom(crewId, phantomId),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: crewKeys.membersAll() })
+    }
+  }))
+}
+
+/**
+ * Assign phantom player mutation
+ */
+export function useAssignPhantom() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({
+      crewId,
+      phantomId,
+      userId
+    }: {
+      crewId: string
+      phantomId: string
+      userId: string
+    }) => crewAdapter.assignPhantom(crewId, phantomId, userId),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: crewKeys.membersAll() })
+    }
+  }))
+}
+
+/**
+ * Confirm phantom claim mutation
+ */
+export function useConfirmPhantomClaim() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({ crewId, phantomId }: { crewId: string; phantomId: string }) =>
+      crewAdapter.confirmPhantomClaim(crewId, phantomId),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: crewKeys.membersAll() })
+    }
+  }))
+}
diff --git a/src/lib/api/mutations/gw.mutations.ts b/src/lib/api/mutations/gw.mutations.ts
new file mode 100644
index 00000000..bd5ad1e1
--- /dev/null
+++ b/src/lib/api/mutations/gw.mutations.ts
@@ -0,0 +1,213 @@
+/**
+ * GW (Guild War) Mutation Configurations
+ *
+ * Provides mutation configurations for GW operations
+ * with cache invalidation using TanStack Query v6.
+ *
+ * @module api/mutations/gw
+ */
+
+import { useQueryClient, createMutation } from '@tanstack/svelte-query'
+import { gwAdapter } from '$lib/api/adapters/gw.adapter'
+import { gwKeys } from '$lib/api/queries/gw.queries'
+import type {
+  CreateGwEventInput,
+  UpdateGwEventInput,
+  UpdateParticipationRankingInput,
+  CreateCrewScoreInput,
+  UpdateCrewScoreInput,
+  CreateIndividualScoreInput,
+  BatchIndividualScoresInput
+} from '$lib/types/api/gw'
+
+// ==================== Event Mutations (Admin) ====================
+
+/**
+ * Create GW event mutation (admin only)
+ */
+export function useCreateGwEvent() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: (input: CreateGwEventInput) => gwAdapter.createEvent(input),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: gwKeys.events() })
+    }
+  }))
+}
+
+/**
+ * Update GW event mutation (admin only)
+ */
+export function useUpdateGwEvent() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({ eventId, input }: { eventId: string; input: UpdateGwEventInput }) =>
+      gwAdapter.updateEvent(eventId, input),
+    onSuccess: (_data, { eventId }) => {
+      queryClient.invalidateQueries({ queryKey: gwKeys.events() })
+      queryClient.invalidateQueries({ queryKey: gwKeys.event(eventId) })
+    }
+  }))
+}
+
+// ==================== Participation Mutations ====================
+
+/**
+ * Join GW event mutation
+ */
+export function useJoinGwEvent() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: (eventId: string) => gwAdapter.joinEvent(eventId),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: gwKeys.participationsAll() })
+    }
+  }))
+}
+
+/**
+ * Update participation ranking mutation
+ */
+export function useUpdateParticipationRanking() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({
+      participationId,
+      input
+    }: {
+      participationId: string
+      input: UpdateParticipationRankingInput
+    }) => gwAdapter.updateParticipationRanking(participationId, input),
+    onSuccess: (_data, { participationId }) => {
+      queryClient.invalidateQueries({ queryKey: gwKeys.participationsAll() })
+      queryClient.invalidateQueries({ queryKey: gwKeys.participation(participationId) })
+    }
+  }))
+}
+
+// ==================== Crew Score Mutations ====================
+
+/**
+ * Add crew score mutation
+ */
+export function useAddCrewScore() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({
+      participationId,
+      input
+    }: {
+      participationId: string
+      input: CreateCrewScoreInput
+    }) => gwAdapter.addCrewScore(participationId, input),
+    onSuccess: (_data, { participationId }) => {
+      queryClient.invalidateQueries({ queryKey: gwKeys.participation(participationId) })
+    }
+  }))
+}
+
+/**
+ * Update crew score mutation
+ */
+export function useUpdateCrewScore() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({
+      participationId,
+      scoreId,
+      input
+    }: {
+      participationId: string
+      scoreId: string
+      input: UpdateCrewScoreInput
+    }) => gwAdapter.updateCrewScore(participationId, scoreId, input),
+    onSuccess: (_data, { participationId }) => {
+      queryClient.invalidateQueries({ queryKey: gwKeys.participation(participationId) })
+    }
+  }))
+}
+
+// ==================== Individual Score Mutations ====================
+
+/**
+ * Add individual score mutation
+ */
+export function useAddIndividualScore() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({
+      participationId,
+      input
+    }: {
+      participationId: string
+      input: CreateIndividualScoreInput
+    }) => gwAdapter.addIndividualScore(participationId, input),
+    onSuccess: (_data, { participationId }) => {
+      queryClient.invalidateQueries({ queryKey: gwKeys.participation(participationId) })
+    }
+  }))
+}
+
+/**
+ * Batch add individual scores mutation
+ */
+export function useBatchAddIndividualScores() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({
+      participationId,
+      input
+    }: {
+      participationId: string
+      input: BatchIndividualScoresInput
+    }) => gwAdapter.batchAddIndividualScores(participationId, input),
+    onSuccess: (_data, { participationId }) => {
+      queryClient.invalidateQueries({ queryKey: gwKeys.participation(participationId) })
+    }
+  }))
+}
+
+/**
+ * Update individual score mutation
+ */
+export function useUpdateIndividualScore() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({
+      participationId,
+      scoreId,
+      input
+    }: {
+      participationId: string
+      scoreId: string
+      input: Partial<CreateIndividualScoreInput>
+    }) => gwAdapter.updateIndividualScore(participationId, scoreId, input),
+    onSuccess: (_data, { participationId }) => {
+      queryClient.invalidateQueries({ queryKey: gwKeys.participation(participationId) })
+    }
+  }))
+}
+
+/**
+ * Delete individual score mutation
+ */
+export function useDeleteIndividualScore() {
+  const queryClient = useQueryClient()
+
+  return createMutation(() => ({
+    mutationFn: ({ participationId, scoreId }: { participationId: string; scoreId: string }) =>
+      gwAdapter.deleteIndividualScore(participationId, scoreId),
+    onSuccess: (_data, { participationId }) => {
+      queryClient.invalidateQueries({ queryKey: gwKeys.participation(participationId) })
+    }
+  }))
+}
diff --git a/src/lib/api/queries/crew.queries.ts b/src/lib/api/queries/crew.queries.ts
new file mode 100644
index 00000000..2fc574c1
--- /dev/null
+++ b/src/lib/api/queries/crew.queries.ts
@@ -0,0 +1,117 @@
+/**
+ * Crew Query Options Factory
+ *
+ * Provides type-safe, reusable query configurations for crew operations
+ * using TanStack Query v6 patterns.
+ *
+ * @module api/queries/crew
+ */
+
+import { queryOptions } from '@tanstack/svelte-query'
+import { crewAdapter } from '$lib/api/adapters/crew.adapter'
+import type { MemberFilter } from '$lib/types/api/crew'
+
+/**
+ * Crew query options factory
+ *
+ * @example
+ * ```typescript
+ * import { createQuery } from '@tanstack/svelte-query'
+ * import { crewQueries } from '$lib/api/queries/crew.queries'
+ *
+ * // Current user's crew
+ * const crew = createQuery(() => crewQueries.myCrew())
+ *
+ * // Crew members
+ * const members = createQuery(() => crewQueries.members('active'))
+ *
+ * // Pending invitations
+ * const invitations = createQuery(() => crewQueries.pendingInvitations())
+ * ```
+ */
+export const crewQueries = {
+  /**
+   * Current user's crew query options
+   */
+  myCrew: () =>
+    queryOptions({
+      queryKey: ['crew', 'my'] as const,
+      queryFn: () => crewAdapter.getMyCrew(),
+      staleTime: 1000 * 60 * 5, // 5 minutes
+      gcTime: 1000 * 60 * 30, // 30 minutes
+      retry: (failureCount, error) => {
+        // Don't retry on 404 (no crew)
+        if (error && 'status' in error && error.status === 404) {
+          return false
+        }
+        return failureCount < 3
+      }
+    }),
+
+  /**
+   * Crew members query options
+   *
+   * @param filter - 'active' (default), 'retired', 'phantom', 'all'
+   */
+  members: (filter: MemberFilter = 'active') =>
+    queryOptions({
+      queryKey: ['crew', 'members', filter] as const,
+      queryFn: () => crewAdapter.getMembers(filter),
+      staleTime: 1000 * 60 * 2, // 2 minutes
+      gcTime: 1000 * 60 * 15 // 15 minutes
+    }),
+
+  /**
+   * Crew's sent invitations query options
+   *
+   * @param crewId - Crew ID
+   */
+  crewInvitations: (crewId: string) =>
+    queryOptions({
+      queryKey: ['crew', crewId, 'invitations'] as const,
+      queryFn: () => crewAdapter.getCrewInvitations(crewId),
+      enabled: !!crewId,
+      staleTime: 1000 * 60 * 2, // 2 minutes
+      gcTime: 1000 * 60 * 15 // 15 minutes
+    }),
+
+  /**
+   * Current user's pending invitations query options
+   */
+  pendingInvitations: () =>
+    queryOptions({
+      queryKey: ['invitations', 'pending'] as const,
+      queryFn: () => crewAdapter.getPendingInvitations(),
+      staleTime: 1000 * 60 * 2, // 2 minutes
+      gcTime: 1000 * 60 * 15 // 15 minutes
+    })
+}
+
+/**
+ * Query key helpers for cache invalidation
+ *
+ * @example
+ * ```typescript
+ * import { useQueryClient } from '@tanstack/svelte-query'
+ * import { crewKeys } from '$lib/api/queries/crew.queries'
+ *
+ * const queryClient = useQueryClient()
+ *
+ * // Invalidate current crew
+ * queryClient.invalidateQueries({ queryKey: crewKeys.myCrew() })
+ *
+ * // Invalidate all member queries
+ * queryClient.invalidateQueries({ queryKey: crewKeys.membersAll() })
+ * ```
+ */
+export const crewKeys = {
+  all: ['crew'] as const,
+  myCrew: () => [...crewKeys.all, 'my'] as const,
+  membersAll: () => [...crewKeys.all, 'members'] as const,
+  members: (filter: MemberFilter) => [...crewKeys.all, 'members', filter] as const,
+  crewInvitations: (crewId: string) => [...crewKeys.all, crewId, 'invitations'] as const,
+  invitations: {
+    all: ['invitations'] as const,
+    pending: () => ['invitations', 'pending'] as const
+  }
+}
diff --git a/src/lib/api/queries/gw.queries.ts b/src/lib/api/queries/gw.queries.ts
new file mode 100644
index 00000000..a96fb714
--- /dev/null
+++ b/src/lib/api/queries/gw.queries.ts
@@ -0,0 +1,109 @@
+/**
+ * GW (Guild War / Unite and Fight) Query Options Factory
+ *
+ * Provides type-safe, reusable query configurations for GW operations
+ * using TanStack Query v6 patterns.
+ *
+ * @module api/queries/gw
+ */
+
+import { queryOptions } from '@tanstack/svelte-query'
+import { gwAdapter } from '$lib/api/adapters/gw.adapter'
+
+/**
+ * GW query options factory
+ *
+ * @example
+ * ```typescript
+ * import { createQuery } from '@tanstack/svelte-query'
+ * import { gwQueries } from '$lib/api/queries/gw.queries'
+ *
+ * // All GW events
+ * const events = createQuery(() => gwQueries.events())
+ *
+ * // Single event
+ * const event = createQuery(() => gwQueries.event(eventId))
+ *
+ * // Crew's participations
+ * const participations = createQuery(() => gwQueries.participations())
+ *
+ * // Single participation with scores
+ * const participation = createQuery(() => gwQueries.participation(participationId))
+ * ```
+ */
+export const gwQueries = {
+  /**
+   * All GW events query options
+   */
+  events: () =>
+    queryOptions({
+      queryKey: ['gw', 'events'] as const,
+      queryFn: () => gwAdapter.getEvents(),
+      staleTime: 1000 * 60 * 10, // 10 minutes - events don't change often
+      gcTime: 1000 * 60 * 60 // 1 hour
+    }),
+
+  /**
+   * Single GW event query options
+   *
+   * @param eventId - Event ID
+   */
+  event: (eventId: string) =>
+    queryOptions({
+      queryKey: ['gw', 'events', eventId] as const,
+      queryFn: () => gwAdapter.getEvent(eventId),
+      enabled: !!eventId,
+      staleTime: 1000 * 60 * 10, // 10 minutes
+      gcTime: 1000 * 60 * 60 // 1 hour
+    }),
+
+  /**
+   * Crew's GW participations query options
+   */
+  participations: () =>
+    queryOptions({
+      queryKey: ['gw', 'participations'] as const,
+      queryFn: () => gwAdapter.getParticipations(),
+      staleTime: 1000 * 60 * 5, // 5 minutes
+      gcTime: 1000 * 60 * 30 // 30 minutes
+    }),
+
+  /**
+   * Single participation with scores query options
+   *
+   * @param participationId - Participation ID
+   */
+  participation: (participationId: string) =>
+    queryOptions({
+      queryKey: ['gw', 'participations', participationId] as const,
+      queryFn: () => gwAdapter.getParticipation(participationId),
+      enabled: !!participationId,
+      staleTime: 1000 * 60 * 2, // 2 minutes - scores change during event
+      gcTime: 1000 * 60 * 15 // 15 minutes
+    })
+}
+
+/**
+ * Query key helpers for cache invalidation
+ *
+ * @example
+ * ```typescript
+ * import { useQueryClient } from '@tanstack/svelte-query'
+ * import { gwKeys } from '$lib/api/queries/gw.queries'
+ *
+ * const queryClient = useQueryClient()
+ *
+ * // Invalidate all events
+ * queryClient.invalidateQueries({ queryKey: gwKeys.events() })
+ *
+ * // Invalidate a specific participation
+ * queryClient.invalidateQueries({ queryKey: gwKeys.participation(participationId) })
+ * ```
+ */
+export const gwKeys = {
+  all: ['gw'] as const,
+  events: () => [...gwKeys.all, 'events'] as const,
+  event: (eventId: string) => [...gwKeys.all, 'events', eventId] as const,
+  participationsAll: () => [...gwKeys.all, 'participations'] as const,
+  participation: (participationId: string) => [...gwKeys.all, 'participations', participationId] as const
+}
diff --git a/src/lib/components/crew/CrewHeader.svelte b/src/lib/components/crew/CrewHeader.svelte
new file mode 100644
index 00000000..82f3fc00
--- /dev/null
+++ b/src/lib/components/crew/CrewHeader.svelte
@@ -0,0 +1,90 @@
+<svelte:options runes={true} />
+
+<script lang="ts">
+	import type { Snippet } from 'svelte'
+
+	interface Props {
+		/** Main title text */
+		title: string
+		/** Optional subtitle (e.g., gamertag) */
+		subtitle?: string | undefined
+		/** Optional description text */
+		description?: string | undefined
+		/** Content rendered below title (e.g., filter tabs) */
+		belowTitle?: Snippet | undefined
+		/** Action buttons on the right */
+		actions?: Snippet | undefined
+	}
+
+	const { title, subtitle, description, belowTitle, actions }: Props = $props()
+</script>
+
+<div class="section-header">
+	<div class="header-info">
+		<div class="title-row">
+			<span class="header-title">{title}</span>
+			{#if subtitle}
+				<span class="header-subtitle">[{subtitle}]</span>
+			{/if}
+		</div>
+		{#if description}
+			<p class="header-description">{description}</p>
+		{/if}
+		{#if belowTitle}
+			{@render belowTitle()}
+		{/if}
+	</div>
+	{#if actions}
+		<div class="header-actions">
+			{@render actions()}
+		</div>
+	{/if}
+</div>
+
+<style lang="scss">
+	@use '$src/themes/spacing' as spacing;
+	@use '$src/themes/typography' as typography;
+
+	.section-header {
+		display: flex;
+		justify-content: space-between;
+		align-items: flex-start;
+		padding: spacing.$unit-2x;
+		border-bottom: 1px solid rgba(0, 0, 0, 0.08);
+	}
+
+	.header-info {
+		display: flex;
+		flex-direction: column;
+		gap: spacing.$unit-half;
+	}
+
+	.title-row {
+		display: flex;
+		align-items: baseline;
+		gap: spacing.$unit;
+	}
+
+	.header-title {
+		font-size: typography.$font-regular;
+		font-weight: typography.$medium;
+	}
+
+	.header-subtitle {
+		font-size: typography.$font-small;
+		color: var(--text-secondary);
+	}
+
+	.header-description {
+		color: var(--text-secondary);
+		font-size: typography.$font-small;
+		line-height: 1.5;
+		margin: 0;
+	}
+
+	.header-actions {
+		display: flex;
+		align-items: center;
+		gap: spacing.$unit;
+	}
+</style>
diff --git a/src/lib/components/ui/ModalBody.svelte b/src/lib/components/ui/ModalBody.svelte
new file mode 100644
index 00000000..7f2d87c2
--- /dev/null
+++ b/src/lib/components/ui/ModalBody.svelte
@@ -0,0 +1,25 @@
+<svelte:options runes={true} />
+
+<script lang="ts">
+	import type { Snippet } from 'svelte'
+
+	interface Props {
+		children: Snippet
+	}
+
+	let { children }: Props = $props()
+</script>
+
+<div class="modal-body">
+	{@render children()}
+</div>
+
+<style lang="scss">
+	@use '$src/themes/spacing' as spacing;
+
+	.modal-body {
+		padding: spacing.$unit-2x;
+		overflow-y: auto;
+		flex: 1;
+	}
+</style>
diff --git a/src/lib/components/ui/ModalFooter.svelte b/src/lib/components/ui/ModalFooter.svelte
new file mode 100644
index 00000000..267f80af
--- /dev/null
+++ b/src/lib/components/ui/ModalFooter.svelte
@@ -0,0 +1,27 @@
+<svelte:options runes={true} />
+
+<script lang="ts">
+	import type { Snippet } from 'svelte'
+
+	interface Props {
+		children: Snippet
+	}
+
+	let { children }: Props = $props()
+</script>
+
+<div class="modal-footer">
+	{@render children()}
+</div>
+
+<style lang="scss">
+	@use '$src/themes/spacing' as spacing;
+
+	.modal-footer {
+		padding: spacing.$unit-2x;
+		padding-top: 0;
+		display: flex;
+		gap: spacing.$unit-2x;
+		justify-content: flex-end;
+	}
+</style>
diff --git a/src/lib/components/ui/ModalHeader.svelte b/src/lib/components/ui/ModalHeader.svelte
new file mode 100644
index 00000000..86cbab5e
--- /dev/null
+++ b/src/lib/components/ui/ModalHeader.svelte
@@ -0,0 +1,54 @@
+<svelte:options runes={true} />
+
+<script lang="ts">
+	import type { Snippet } from 'svelte'
+
+	interface Props {
+		title: string
+		description?: string
+		children?: Snippet
+	}
+
+	let { title, description, children }: Props = $props()
+</script>
+
+<div class="modal-header">
+	<div class="header-text">
+		<h2 class="title">{title}</h2>
+		{#if description}
+			<p class="description">{description}</p>
+		{/if}
+	</div>
+	{#if children}
+		{@render children()}
+	{/if}
+</div>
+
+<style lang="scss">
+	@use '$src/themes/spacing' as spacing;
+	@use '$src/themes/typography' as typography;
+
+	.modal-header {
+		padding: spacing.$unit-2x;
+		padding-bottom: spacing.$unit;
+	}
+
+	.header-text {
+		display: flex;
+		flex-direction: column;
+		gap: spacing.$unit-half;
+	}
+
+	.title {
+		font-size: typography.$font-large;
+		font-weight: typography.$bold;
+		margin: 0;
+		color: var(--text-primary);
+	}
+
+	.description {
+		font-size: typography.$font-small;
+		color: var(--text-secondary);
+		margin: 0;
+	}
+</style>
diff --git a/src/lib/stores/crew.store.svelte.ts b/src/lib/stores/crew.store.svelte.ts
new file mode 100644
index 00000000..22d8f338
--- /dev/null
+++ b/src/lib/stores/crew.store.svelte.ts
@@ -0,0 +1,148 @@
+/**
+ * Crew Store
+ *
+ * Manages the current user's crew state using Svelte 5 runes.
+ * This store is populated after auth and provides convenient
+ * accessors for crew-related permissions.
+ */
+
+import type { Crew, CrewMembership, CrewInvitation } from '$lib/types/api/crew'
+
+class CrewStore {
+  // Core state
+  crew = $state<Crew | null>(null)
+  membership = $state<CrewMembership | null>(null)
+  pendingInvitations = $state<CrewInvitation[]>([])
+  isLoading = $state(false)
+  error = $state<string | null>(null)
+
+  // Computed properties
+  get isInCrew(): boolean {
+    return this.crew !== null
+  }
+
+  get isCaptain(): boolean {
+    return this.membership?.role === 'captain'
+  }
+
+  get isViceCaptain(): boolean {
+    return this.membership?.role === 'vice_captain'
+  }
+
+  get isOfficer(): boolean {
+    return this.isCaptain || this.isViceCaptain
+  }
+
+  get isMember(): boolean {
+    return this.membership?.role === 'member'
+  }
+
+  get canManageMembers(): boolean {
+    return this.isOfficer
+  }
+
+  get canEditCrew(): boolean {
+    return this.isOfficer
+  }
+
+  get canTransferCaptain(): boolean {
+    return this.isCaptain
+  }
+
+  get canLeaveCrew(): boolean {
+    return this.isInCrew && !this.isCaptain
+  }
+
+  get canManagePhantoms(): boolean {
+    return this.isOfficer
+  }
+
+  get canRecordOthersScores(): boolean {
+    return this.isOfficer
+  }
+
+  get hasPendingInvitations(): boolean {
+    return this.pendingInvitations.length > 0
+  }
+
+  get pendingInvitationCount(): number {
+    return this.pendingInvitations.length
+  }
+
+  // Actions
+  setCrew(crew: Crew | null, membership: CrewMembership | null = null) {
+    this.crew = crew
+    this.membership = membership
+    this.error = null
+  }
+
+  setMembership(membership: CrewMembership | null) {
+    this.membership = membership
+  }
+
+  setPendingInvitations(invitations: CrewInvitation[]) {
+    this.pendingInvitations = invitations
+  }
+
+  addPendingInvitation(invitation: CrewInvitation) {
+    this.pendingInvitations = [...this.pendingInvitations, invitation]
+  }
+
+  removePendingInvitation(invitationId: string) {
+    this.pendingInvitations = this.pendingInvitations.filter((inv) => inv.id !== invitationId)
+  }
+
+  setLoading(loading: boolean) {
+    this.isLoading = loading
+  }
+
+  setError(error: string | null) {
+    this.error = error
+  }
+
+  clear() {
+    this.crew = null
+    this.membership = null
+    this.pendingInvitations = []
+    this.isLoading = false
+    this.error = null
+  }
+
+  /**
+   * Check if current user can perform an action on a specific member
+   */
+  canActOnMember(memberRole: 'member' | 'vice_captain' | 'captain'): boolean {
+    if (!this.isOfficer) return false
+
+    // Captain can act on anyone except themselves
+    if (this.isCaptain) return true
+
+    // Vice captain can only act on regular members
+    if (this.isViceCaptain && memberRole === 'member') return true
+
+    return false
+  }
+
+  /**
+   * Check if current user can promote a member to a specific role
+   */
+  canPromoteTo(targetRole: 'vice_captain' | 'captain'): boolean {
+    // Only captain can promote to vice_captain
+    if (targetRole === 'vice_captain') return this.isCaptain
+
+    // No one can promote to captain (must transfer)
+    return false
+  }
+
+  /**
+   * Check if current user can demote a member
+   */
+  canDemote(memberRole: 'vice_captain' | 'captain'): boolean {
+    // Only captain can demote vice captains
+    if (memberRole === 'vice_captain') return this.isCaptain
+
+    return false
+  }
+}
+
+export const crewStore = new CrewStore()