diff --git a/src/modules/nostr-feed/LINK_AGGREGATOR_PLAN.md b/src/modules/nostr-feed/LINK_AGGREGATOR_PLAN.md
index 6bdf31e..9f91aff 100644
--- a/src/modules/nostr-feed/LINK_AGGREGATOR_PLAN.md
+++ b/src/modules/nostr-feed/LINK_AGGREGATOR_PLAN.md
@@ -78,30 +78,38 @@ Transform the nostr-feed module into a Reddit-style link aggregator with support
 
 ## Implementation Phases
 
-### Phase 1: Core Data Model (Current)
+### Phase 1: Core Data Model
 - [x] Create feature branch
 - [x] Document plan
-- [ ] Create `types/submission.ts` - Type definitions
-- [ ] Create `SubmissionService.ts` - Submission CRUD
-- [ ] Create `LinkPreviewService.ts` - OG tag fetching
-- [ ] Extend `FeedService.ts` - Handle kind 1111
+- [x] Create `types/submission.ts` - Type definitions
+- [x] Create `SubmissionService.ts` - Submission CRUD
+- [x] Create `LinkPreviewService.ts` - OG tag fetching
+- [x] Extend `FeedService.ts` - Handle kind 1111
 
 ### Phase 2: Post Creation
-- [ ] Create `SubmitComposer.vue` - Multi-type composer
-- [ ] Add link preview on URL paste
-- [ ] Integrate with pictrs for media upload
-- [ ] Add NSFW toggle
+- [x] Create `SubmitComposer.vue` - Multi-type composer
+- [x] Add link preview on URL paste
+- [x] Add NSFW toggle
+- [x] Add route `/submit` for composer
+- [ ] Integrate with pictrs for media upload (Future)
 
 ### Phase 3: Feed Display
-- [ ] Create `SubmissionCard.vue` - Link aggregator card
-- [ ] Create `VoteButtons.vue` - Up/down voting
-- [ ] Add feed sorting (hot, new, top, controversial)
-- [ ] Add score calculation
+- [x] Create `SubmissionRow.vue` - Link aggregator row (Reddit/Lemmy style)
+- [x] Create `VoteControls.vue` - Up/down voting
+- [x] Create `SortTabs.vue` - Sort tabs (hot, new, top, controversial)
+- [x] Create `SubmissionList.vue` - Main feed container
+- [x] Create `SubmissionThumbnail.vue` - Thumbnail display
+- [x] Add feed sorting (hot, new, top, controversial)
+- [x] Add score calculation
+- [x] Create `LinkAggregatorTest.vue` - Test page with mock data & live mode
 
 ### Phase 4: Detail View
-- [ ] Create `SubmissionDetail.vue` - Full post view
-- [ ] Integrate `ThreadedPost.vue` for comments
-- [ ] Add comment sorting
+- [x] Create `SubmissionDetail.vue` - Full post view with content display
+- [x] Create `SubmissionComment.vue` - Recursive threaded comments
+- [x] Create `SubmissionDetailPage.vue` - Route page wrapper
+- [x] Add route `/submission/:id` for detail view
+- [x] Add comment sorting (best, new, old, controversial)
+- [x] Integrate comment submission via SubmissionService.createComment()
 
 ### Phase 5: Communities (Future)
 - [ ] Create `CommunityService.ts`
diff --git a/src/modules/nostr-feed/components/SortTabs.vue b/src/modules/nostr-feed/components/SortTabs.vue
index ff9bb3c..e825b4b 100644
--- a/src/modules/nostr-feed/components/SortTabs.vue
+++ b/src/modules/nostr-feed/components/SortTabs.vue
@@ -6,6 +6,13 @@
 
 import { computed } from 'vue'
 import { Flame, Clock, TrendingUp, Swords } from 'lucide-vue-next'
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue
+} from '@/components/ui/select'
 import type { SortType, TimeRange } from '../types/submission'
 
 interface Props {
@@ -78,19 +85,23 @@ function selectTimeRange(range: TimeRange) {
     <!-- Time range dropdown (for top) -->
     <template v-if="showTimeDropdown">
       <span class="text-muted-foreground mx-1">·</span>
-      <select
-        :value="currentTimeRange"
-        class="bg-transparent text-sm text-muted-foreground hover:text-foreground cursor-pointer border-none outline-none"
-        @change="selectTimeRange(($event.target as HTMLSelectElement).value as TimeRange)"
+      <Select
+        :model-value="currentTimeRange"
+        @update:model-value="selectTimeRange($event as TimeRange)"
       >
-        <option
-          v-for="range in timeRangeOptions"
-          :key="range.id"
-          :value="range.id"
-        >
-          {{ range.label }}
-        </option>
-      </select>
+        <SelectTrigger class="h-auto w-auto gap-1 border-0 bg-transparent px-1 py-0.5 text-sm text-muted-foreground shadow-none hover:text-foreground focus:ring-0">
+          <SelectValue />
+        </SelectTrigger>
+        <SelectContent>
+          <SelectItem
+            v-for="range in timeRangeOptions"
+            :key="range.id"
+            :value="range.id"
+          >
+            {{ range.label }}
+          </SelectItem>
+        </SelectContent>
+      </Select>
     </template>
   </div>
 </template>
diff --git a/src/modules/nostr-feed/components/SubmissionComment.vue b/src/modules/nostr-feed/components/SubmissionComment.vue
new file mode 100644
index 0000000..9a5f6d4
--- /dev/null
+++ b/src/modules/nostr-feed/components/SubmissionComment.vue
@@ -0,0 +1,276 @@
+<script setup lang="ts">
+/**
+ * SubmissionComment - Recursive comment component for submission threads
+ * Displays a single comment with vote controls and nested replies
+ */
+
+import { computed, ref } from 'vue'
+import { formatDistanceToNow } from 'date-fns'
+import { ChevronUp, ChevronDown, Reply, Flag, MoreHorizontal, Send, X } from 'lucide-vue-next'
+import VoteControls from './VoteControls.vue'
+import type { SubmissionComment as CommentType } from '../types/submission'
+
+interface Props {
+  comment: CommentType
+  depth: number
+  collapsedComments: Set<string>
+  getDisplayName: (pubkey: string) => string
+  isAuthenticated: boolean
+  currentUserPubkey?: string | null
+  replyingToId?: string | null
+  isSubmittingReply?: boolean
+}
+
+interface Emits {
+  (e: 'toggle-collapse', commentId: string): void
+  (e: 'reply', comment: CommentType): void
+  (e: 'cancel-reply'): void
+  (e: 'submit-reply', commentId: string, text: string): void
+  (e: 'upvote', comment: CommentType): void
+  (e: 'downvote', comment: CommentType): void
+}
+
+const props = withDefaults(defineProps<Props>(), {
+  replyingToId: null,
+  isSubmittingReply: false
+})
+const emit = defineEmits<Emits>()
+
+// Local reply text
+const replyText = ref('')
+
+// Is this comment being replied to
+const isBeingRepliedTo = computed(() => props.replyingToId === props.comment.id)
+
+// Handle reply click
+function onReplyClick() {
+  emit('reply', props.comment)
+}
+
+// Submit the reply
+function submitReply() {
+  if (!replyText.value.trim()) return
+  emit('submit-reply', props.comment.id, replyText.value.trim())
+  replyText.value = ''
+}
+
+// Cancel reply
+function cancelReply() {
+  replyText.value = ''
+  emit('cancel-reply')
+}
+
+// Is this comment collapsed
+const isCollapsed = computed(() => props.collapsedComments.has(props.comment.id))
+
+// Has replies
+const hasReplies = computed(() => props.comment.replies && props.comment.replies.length > 0)
+
+// Count total nested replies
+const replyCount = computed(() => {
+  const count = (c: CommentType): number => {
+    let total = c.replies?.length || 0
+    c.replies?.forEach(r => { total += count(r) })
+    return total
+  }
+  return count(props.comment)
+})
+
+// Format time
+function formatTime(timestamp: number): string {
+  return formatDistanceToNow(timestamp * 1000, { addSuffix: true })
+}
+
+// Depth colors for threading lines (using theme-aware chart colors)
+const depthColors = [
+  'bg-chart-1',
+  'bg-chart-2',
+  'bg-chart-3',
+  'bg-chart-4',
+  'bg-chart-5'
+]
+
+const depthColor = computed(() => depthColors[props.depth % depthColors.length])
+
+// Is own comment
+const isOwnComment = computed(() =>
+  props.currentUserPubkey && props.currentUserPubkey === props.comment.pubkey
+)
+</script>
+
+<template>
+  <div
+    :class="[
+      'relative',
+      depth > 0 ? 'ml-0.5' : ''
+    ]"
+  >
+    <!-- Threading line -->
+    <div
+      v-if="depth > 0"
+      :class="[
+        'absolute left-0 top-0 bottom-0 w-0.5',
+        depthColor,
+        'hover:w-1 transition-all cursor-pointer'
+      ]"
+      @click="emit('toggle-collapse', comment.id)"
+    />
+
+    <!-- Comment content -->
+    <div
+      :class="[
+        'py-1',
+        depth > 0 ? 'pl-2' : '',
+        'hover:bg-accent/20 transition-colors'
+      ]"
+    >
+      <!-- Header row -->
+      <div class="flex items-center gap-2 text-xs">
+        <!-- Collapse toggle -->
+        <button
+          v-if="hasReplies"
+          class="text-muted-foreground hover:text-foreground"
+          @click="emit('toggle-collapse', comment.id)"
+        >
+          <ChevronDown v-if="!isCollapsed" class="h-3.5 w-3.5" />
+          <ChevronUp v-else class="h-3.5 w-3.5" />
+        </button>
+        <div v-else class="w-3.5" />
+
+        <!-- Author -->
+        <span class="font-medium hover:underline cursor-pointer">
+          {{ getDisplayName(comment.pubkey) }}
+        </span>
+
+        <!-- Score -->
+        <span class="text-muted-foreground">
+          {{ comment.votes.score }} {{ comment.votes.score === 1 ? 'point' : 'points' }}
+        </span>
+
+        <!-- Time -->
+        <span class="text-muted-foreground">
+          {{ formatTime(comment.created_at) }}
+        </span>
+
+        <!-- Collapsed indicator -->
+        <span v-if="isCollapsed && hasReplies" class="text-muted-foreground">
+          ({{ replyCount }} {{ replyCount === 1 ? 'child' : 'children' }})
+        </span>
+      </div>
+
+      <!-- Content (hidden when collapsed) -->
+      <div v-if="!isCollapsed">
+        <!-- Comment body -->
+        <div class="mt-1 text-sm whitespace-pre-wrap leading-relaxed pl-5">
+          {{ comment.content }}
+        </div>
+
+        <!-- Actions -->
+        <div class="flex items-center gap-1 mt-1 pl-5">
+          <!-- Vote buttons (inline style) -->
+          <button
+            :class="[
+              'p-1 transition-colors',
+              comment.votes.userVote === 'upvote'
+                ? 'text-orange-500'
+                : 'text-muted-foreground hover:text-orange-500'
+            ]"
+            :disabled="!isAuthenticated"
+            @click="emit('upvote', comment)"
+          >
+            <ChevronUp class="h-4 w-4" />
+          </button>
+          <button
+            :class="[
+              'p-1 transition-colors',
+              comment.votes.userVote === 'downvote'
+                ? 'text-blue-500'
+                : 'text-muted-foreground hover:text-blue-500'
+            ]"
+            :disabled="!isAuthenticated"
+            @click="emit('downvote', comment)"
+          >
+            <ChevronDown class="h-4 w-4" />
+          </button>
+
+          <!-- Reply -->
+          <button
+            class="flex items-center gap-1 px-2 py-1 text-xs text-muted-foreground hover:text-foreground hover:bg-accent rounded transition-colors"
+            :disabled="!isAuthenticated"
+            @click="onReplyClick"
+          >
+            <Reply class="h-3 w-3" />
+            <span>reply</span>
+          </button>
+
+          <!-- Report (not for own comments) -->
+          <button
+            v-if="!isOwnComment"
+            class="flex items-center gap-1 px-2 py-1 text-xs text-muted-foreground hover:text-foreground hover:bg-accent rounded transition-colors"
+          >
+            <Flag class="h-3 w-3" />
+            <span>report</span>
+          </button>
+
+          <!-- More options -->
+          <button
+            class="p-1 text-muted-foreground hover:text-foreground hover:bg-accent rounded transition-colors"
+          >
+            <MoreHorizontal class="h-3 w-3" />
+          </button>
+        </div>
+
+        <!-- Inline reply form -->
+        <div v-if="isBeingRepliedTo" class="mt-2 pl-5">
+          <div class="border rounded-lg bg-background p-2">
+            <textarea
+              v-model="replyText"
+              placeholder="Write a reply..."
+              rows="3"
+              class="w-full px-2 py-1.5 text-sm bg-transparent resize-none focus:outline-none"
+              :disabled="isSubmittingReply"
+            />
+            <div class="flex items-center justify-end gap-2 mt-1">
+              <button
+                class="px-3 py-1 text-xs text-muted-foreground hover:text-foreground transition-colors"
+                @click="cancelReply"
+              >
+                Cancel
+              </button>
+              <button
+                class="flex items-center gap-1 px-3 py-1 text-xs bg-primary text-primary-foreground rounded hover:bg-primary/90 transition-colors disabled:opacity-50"
+                :disabled="!replyText.trim() || isSubmittingReply"
+                @click="submitReply"
+              >
+                <Send class="h-3 w-3" />
+                Reply
+              </button>
+            </div>
+          </div>
+        </div>
+
+        <!-- Nested replies -->
+        <div v-if="hasReplies" class="mt-1">
+          <SubmissionComment
+            v-for="reply in comment.replies"
+            :key="reply.id"
+            :comment="reply"
+            :depth="depth + 1"
+            :collapsed-comments="collapsedComments"
+            :get-display-name="getDisplayName"
+            :is-authenticated="isAuthenticated"
+            :current-user-pubkey="currentUserPubkey"
+            :replying-to-id="replyingToId"
+            :is-submitting-reply="isSubmittingReply"
+            @toggle-collapse="emit('toggle-collapse', $event)"
+            @reply="emit('reply', $event)"
+            @cancel-reply="emit('cancel-reply')"
+            @submit-reply="(commentId, text) => emit('submit-reply', commentId, text)"
+            @upvote="emit('upvote', $event)"
+            @downvote="emit('downvote', $event)"
+          />
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
diff --git a/src/modules/nostr-feed/components/SubmissionDetail.vue b/src/modules/nostr-feed/components/SubmissionDetail.vue
new file mode 100644
index 0000000..a4f2819
--- /dev/null
+++ b/src/modules/nostr-feed/components/SubmissionDetail.vue
@@ -0,0 +1,541 @@
+<script setup lang="ts">
+/**
+ * SubmissionDetail - Full post view with comments
+ * Displays complete submission content and threaded comments
+ */
+
+import { ref, computed } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+import { formatDistanceToNow } from 'date-fns'
+import {
+  ArrowLeft,
+  MessageSquare,
+  Share2,
+  Bookmark,
+  Flag,
+  ExternalLink,
+  Image as ImageIcon,
+  FileText,
+  Loader2,
+  ChevronUp,
+  ChevronDown,
+  Reply,
+  Send
+} from 'lucide-vue-next'
+import { Badge } from '@/components/ui/badge'
+import { Button } from '@/components/ui/button'
+import VoteControls from './VoteControls.vue'
+import SubmissionCommentComponent from './SubmissionComment.vue'
+import { useSubmission } from '../composables/useSubmissions'
+import { tryInjectService, SERVICE_TOKENS } from '@/core/di-container'
+import type { ProfileService } from '../services/ProfileService'
+import type { SubmissionService } from '../services/SubmissionService'
+import type {
+  SubmissionWithMeta,
+  SubmissionComment as SubmissionCommentType,
+  LinkSubmission,
+  MediaSubmission,
+  SelfSubmission
+} from '../types/submission'
+
+interface Props {
+  /** Submission ID to display */
+  submissionId: string
+}
+
+const props = defineProps<Props>()
+const router = useRouter()
+
+// Comment sort options
+type CommentSort = 'best' | 'new' | 'old' | 'controversial'
+
+// Inject services
+const profileService = tryInjectService<ProfileService>(SERVICE_TOKENS.PROFILE_SERVICE)
+const authService = tryInjectService<any>(SERVICE_TOKENS.AUTH_SERVICE)
+const submissionService = tryInjectService<SubmissionService>(SERVICE_TOKENS.SUBMISSION_SERVICE)
+
+// Use submission composable - handles subscription automatically
+const { submission, comments, upvote, downvote, isLoading, error } = useSubmission(props.submissionId)
+
+// Comment composer state
+const showComposer = ref(false)
+const replyingTo = ref<{ id: string; author: string } | null>(null)
+const commentText = ref('')
+const isSubmittingComment = ref(false)
+const commentError = ref<string | null>(null)
+
+// Comment sorting state
+const commentSort = ref<CommentSort>('best')
+
+// Collapsed comments state
+const collapsedComments = ref(new Set<string>())
+
+// Sorted comments
+const sortedComments = computed(() => {
+  if (submissionService) {
+    return submissionService.getSortedComments(props.submissionId, commentSort.value)
+  }
+  return comments.value
+})
+
+// Auth state
+const isAuthenticated = computed(() => authService?.isAuthenticated?.value || false)
+const currentUserPubkey = computed(() => authService?.user?.value?.pubkey || null)
+
+// Get display name for a pubkey
+function getDisplayName(pubkey: string): string {
+  if (profileService) {
+    const profile = profileService.getProfile(pubkey)
+    if (profile?.display_name) return profile.display_name
+    if (profile?.name) return profile.name
+  }
+  return `${pubkey.slice(0, 8)}...`
+}
+
+// Format timestamp
+function formatTime(timestamp: number): string {
+  return formatDistanceToNow(timestamp * 1000, { addSuffix: true })
+}
+
+// Extract domain from URL
+function extractDomain(url: string): string {
+  try {
+    return new URL(url).hostname.replace('www.', '')
+  } catch {
+    return url
+  }
+}
+
+// Cast submission to specific type
+const linkSubmission = computed(() =>
+  submission.value?.postType === 'link' ? submission.value as LinkSubmission : null
+)
+const mediaSubmission = computed(() =>
+  submission.value?.postType === 'media' ? submission.value as MediaSubmission : null
+)
+const selfSubmission = computed(() =>
+  submission.value?.postType === 'self' ? submission.value as SelfSubmission : null
+)
+
+// Community name
+const communityName = computed(() => {
+  if (!submission.value?.communityRef) return null
+  const parts = submission.value.communityRef.split(':')
+  return parts.length >= 3 ? parts.slice(2).join(':') : null
+})
+
+// Handle voting
+async function onUpvote() {
+  if (!isAuthenticated.value) return
+  try {
+    await upvote()
+  } catch (err) {
+    console.error('Failed to upvote:', err)
+  }
+}
+
+async function onDownvote() {
+  if (!isAuthenticated.value) return
+  try {
+    await downvote()
+  } catch (err) {
+    console.error('Failed to downvote:', err)
+  }
+}
+
+// Handle comment voting
+async function onCommentUpvote(comment: SubmissionCommentType) {
+  if (!isAuthenticated.value || !submissionService) return
+  try {
+    await submissionService.upvoteComment(props.submissionId, comment.id)
+  } catch (err) {
+    console.error('Failed to upvote comment:', err)
+  }
+}
+
+async function onCommentDownvote(comment: SubmissionCommentType) {
+  if (!isAuthenticated.value || !submissionService) return
+  try {
+    await submissionService.downvoteComment(props.submissionId, comment.id)
+  } catch (err) {
+    console.error('Failed to downvote comment:', err)
+  }
+}
+
+// Handle share
+function onShare() {
+  const url = window.location.href
+  navigator.clipboard?.writeText(url)
+  // TODO: Show toast
+}
+
+// Computed for passing to comment components
+const replyingToId = computed(() => replyingTo.value?.id || null)
+
+// Handle comment reply - for inline replies to comments
+function startReply(comment?: SubmissionCommentType) {
+  if (comment) {
+    // Replying to a comment - show inline form (handled by SubmissionComment)
+    replyingTo.value = { id: comment.id, author: getDisplayName(comment.pubkey) }
+    showComposer.value = false // Hide top composer
+  } else {
+    // Top-level comment - show top composer
+    replyingTo.value = null
+    showComposer.value = true
+  }
+  commentText.value = ''
+}
+
+function cancelReply() {
+  showComposer.value = false
+  replyingTo.value = null
+  commentText.value = ''
+}
+
+// Submit top-level comment (from top composer)
+async function submitComment() {
+  if (!commentText.value.trim() || !isAuthenticated.value || !submissionService) return
+
+  isSubmittingComment.value = true
+  commentError.value = null
+
+  try {
+    await submissionService.createComment(
+      props.submissionId,
+      commentText.value.trim(),
+      null // Top-level comment
+    )
+    cancelReply()
+  } catch (err: any) {
+    console.error('Failed to submit comment:', err)
+    commentError.value = err.message || 'Failed to post comment'
+  } finally {
+    isSubmittingComment.value = false
+  }
+}
+
+// Submit inline reply (from SubmissionComment's inline form)
+async function submitReply(commentId: string, text: string) {
+  if (!text.trim() || !isAuthenticated.value || !submissionService) return
+
+  isSubmittingComment.value = true
+  commentError.value = null
+
+  try {
+    await submissionService.createComment(
+      props.submissionId,
+      text.trim(),
+      commentId
+    )
+    cancelReply()
+  } catch (err: any) {
+    console.error('Failed to submit reply:', err)
+    commentError.value = err.message || 'Failed to post reply'
+  } finally {
+    isSubmittingComment.value = false
+  }
+}
+
+// Toggle comment collapse
+function toggleCollapse(commentId: string) {
+  if (collapsedComments.value.has(commentId)) {
+    collapsedComments.value.delete(commentId)
+  } else {
+    collapsedComments.value.add(commentId)
+  }
+  // Trigger reactivity
+  collapsedComments.value = new Set(collapsedComments.value)
+}
+
+// Count total replies
+function countReplies(comment: SubmissionCommentType): number {
+  let count = comment.replies?.length || 0
+  comment.replies?.forEach(reply => {
+    count += countReplies(reply)
+  })
+  return count
+}
+
+// Go back
+function goBack() {
+  router.back()
+}
+</script>
+
+<template>
+  <div class="min-h-screen bg-background">
+    <!-- Header -->
+    <header class="sticky top-0 z-40 bg-background/95 backdrop-blur border-b">
+      <div class="max-w-4xl mx-auto px-4 py-3">
+        <div class="flex items-center gap-3">
+          <Button variant="ghost" size="sm" @click="goBack" class="h-8 w-8 p-0">
+            <ArrowLeft class="h-4 w-4" />
+          </Button>
+          <div class="flex-1 min-w-0">
+            <h1 class="text-sm font-medium truncate">
+              {{ submission?.title || 'Loading...' }}
+            </h1>
+            <p v-if="communityName" class="text-xs text-muted-foreground">
+              {{ communityName }}
+            </p>
+          </div>
+        </div>
+      </div>
+    </header>
+
+    <!-- Loading state -->
+    <div v-if="isLoading && !submission" class="flex items-center justify-center py-16">
+      <Loader2 class="h-6 w-6 animate-spin text-muted-foreground" />
+      <span class="ml-2 text-sm text-muted-foreground">Loading submission...</span>
+    </div>
+
+    <!-- Error state -->
+    <div v-else-if="error" class="max-w-4xl mx-auto p-4">
+      <div class="text-center py-8">
+        <p class="text-sm text-destructive">{{ error }}</p>
+        <Button variant="outline" size="sm" class="mt-4" @click="goBack">
+          Go Back
+        </Button>
+      </div>
+    </div>
+
+    <!-- Submission content -->
+    <main v-else-if="submission" class="max-w-4xl mx-auto">
+      <article class="p-4 border-b">
+        <!-- Post header with votes -->
+        <div class="flex gap-3">
+          <!-- Vote controls -->
+          <VoteControls
+            :score="submission.votes.score"
+            :user-vote="submission.votes.userVote"
+            :disabled="!isAuthenticated"
+            @upvote="onUpvote"
+            @downvote="onDownvote"
+          />
+
+          <!-- Content -->
+          <div class="flex-1 min-w-0">
+            <!-- Title -->
+            <h1 class="text-xl font-semibold leading-tight mb-2">
+              {{ submission.title }}
+            </h1>
+
+            <!-- Badges -->
+            <div v-if="submission.nsfw || submission.flair" class="flex items-center gap-2 mb-2">
+              <Badge v-if="submission.nsfw" variant="destructive" class="text-xs">
+                NSFW
+              </Badge>
+              <Badge v-if="submission.flair" variant="secondary" class="text-xs">
+                {{ submission.flair }}
+              </Badge>
+            </div>
+
+            <!-- Metadata -->
+            <div class="text-sm text-muted-foreground mb-4">
+              <span>submitted {{ formatTime(submission.created_at) }}</span>
+              <span> by </span>
+              <span class="font-medium hover:underline cursor-pointer">
+                {{ getDisplayName(submission.pubkey) }}
+              </span>
+              <template v-if="communityName">
+                <span> to </span>
+                <span class="font-medium hover:underline cursor-pointer">{{ communityName }}</span>
+              </template>
+            </div>
+
+            <!-- Link post content -->
+            <div v-if="linkSubmission" class="mb-4">
+              <a
+                :href="linkSubmission.url"
+                target="_blank"
+                rel="noopener noreferrer"
+                class="block p-4 border rounded-lg hover:bg-accent/30 transition-colors group"
+              >
+                <div class="flex items-start gap-4">
+                  <!-- Preview image -->
+                  <div
+                    v-if="linkSubmission.preview?.image"
+                    class="flex-shrink-0 w-32 h-24 rounded overflow-hidden bg-muted"
+                  >
+                    <img
+                      :src="linkSubmission.preview.image"
+                      :alt="linkSubmission.preview.title || ''"
+                      class="w-full h-full object-cover"
+                    />
+                  </div>
+                  <div v-else class="flex-shrink-0 w-16 h-16 rounded bg-muted flex items-center justify-center">
+                    <ExternalLink class="h-6 w-6 text-muted-foreground" />
+                  </div>
+
+                  <!-- Preview content -->
+                  <div class="flex-1 min-w-0">
+                    <div class="flex items-center gap-2 text-xs text-muted-foreground mb-1">
+                      <ExternalLink class="h-3 w-3" />
+                      <span>{{ extractDomain(linkSubmission.url) }}</span>
+                    </div>
+                    <h3 v-if="linkSubmission.preview?.title" class="font-medium text-sm group-hover:underline">
+                      {{ linkSubmission.preview.title }}
+                    </h3>
+                    <p v-if="linkSubmission.preview?.description" class="text-xs text-muted-foreground mt-1 line-clamp-2">
+                      {{ linkSubmission.preview.description }}
+                    </p>
+                  </div>
+                </div>
+              </a>
+
+              <!-- Optional body -->
+              <div v-if="linkSubmission.body" class="mt-4 text-sm whitespace-pre-wrap">
+                {{ linkSubmission.body }}
+              </div>
+            </div>
+
+            <!-- Media post content -->
+            <div v-if="mediaSubmission" class="mb-4">
+              <div class="rounded-lg overflow-hidden bg-muted">
+                <img
+                  v-if="mediaSubmission.media.mimeType?.startsWith('image/')"
+                  :src="mediaSubmission.media.url"
+                  :alt="mediaSubmission.media.alt || ''"
+                  class="max-w-full max-h-[600px] mx-auto"
+                />
+                <video
+                  v-else-if="mediaSubmission.media.mimeType?.startsWith('video/')"
+                  :src="mediaSubmission.media.url"
+                  controls
+                  class="max-w-full max-h-[600px] mx-auto"
+                />
+                <div v-else class="p-8 flex flex-col items-center justify-center">
+                  <ImageIcon class="h-12 w-12 text-muted-foreground mb-2" />
+                  <a
+                    :href="mediaSubmission.media.url"
+                    target="_blank"
+                    class="text-sm text-primary hover:underline"
+                  >
+                    View media
+                  </a>
+                </div>
+              </div>
+
+              <!-- Caption -->
+              <div v-if="mediaSubmission.body" class="mt-4 text-sm whitespace-pre-wrap">
+                {{ mediaSubmission.body }}
+              </div>
+            </div>
+
+            <!-- Self post content -->
+            <div v-if="selfSubmission" class="mb-4">
+              <div class="text-sm whitespace-pre-wrap leading-relaxed">
+                {{ selfSubmission.body }}
+              </div>
+            </div>
+
+            <!-- Actions -->
+            <div class="flex items-center gap-4 text-sm text-muted-foreground">
+              <button
+                class="flex items-center gap-1.5 hover:text-foreground transition-colors"
+                @click="startReply()"
+              >
+                <MessageSquare class="h-4 w-4" />
+                <span>{{ submission.commentCount }} comments</span>
+              </button>
+              <button
+                class="flex items-center gap-1.5 hover:text-foreground transition-colors"
+                @click="onShare"
+              >
+                <Share2 class="h-4 w-4" />
+                <span>share</span>
+              </button>
+              <button class="flex items-center gap-1.5 hover:text-foreground transition-colors">
+                <Bookmark class="h-4 w-4" />
+                <span>save</span>
+              </button>
+              <button class="flex items-center gap-1.5 hover:text-foreground transition-colors">
+                <Flag class="h-4 w-4" />
+                <span>report</span>
+              </button>
+            </div>
+          </div>
+        </div>
+      </article>
+
+      <!-- Top-level comment composer (only for new comments, not replies) -->
+      <div v-if="isAuthenticated && !replyingTo" class="p-4 border-b">
+        <div class="flex gap-2">
+          <textarea
+            v-model="commentText"
+            placeholder="Write a comment..."
+            rows="3"
+            class="flex-1 px-3 py-2 text-sm border rounded-lg bg-background resize-none focus:outline-none focus:ring-2 focus:ring-primary"
+          />
+        </div>
+        <!-- Comment error -->
+        <div v-if="commentError" class="mt-2 text-sm text-destructive">
+          {{ commentError }}
+        </div>
+        <div class="flex justify-end mt-2">
+          <Button
+            size="sm"
+            :disabled="!commentText.trim() || isSubmittingComment"
+            @click="submitComment"
+          >
+            <Loader2 v-if="isSubmittingComment" class="h-4 w-4 animate-spin mr-2" />
+            <Send v-else class="h-4 w-4 mr-2" />
+            Comment
+          </Button>
+        </div>
+      </div>
+
+      <!-- Comments section -->
+      <section class="divide-y divide-border">
+        <!-- Comment sort selector -->
+        <div v-if="sortedComments.length > 0" class="px-4 py-3 border-b flex items-center gap-2">
+          <span class="text-sm text-muted-foreground">Sort by:</span>
+          <select
+            v-model="commentSort"
+            class="text-sm bg-background border rounded px-2 py-1 focus:outline-none focus:ring-2 focus:ring-primary"
+          >
+            <option value="best">Best</option>
+            <option value="new">New</option>
+            <option value="old">Old</option>
+            <option value="controversial">Controversial</option>
+          </select>
+        </div>
+
+        <div v-if="sortedComments.length === 0" class="p-8 text-center text-sm text-muted-foreground">
+          No comments yet. Be the first to comment!
+        </div>
+
+        <!-- Recursive comment rendering -->
+        <template v-for="comment in sortedComments" :key="comment.id">
+          <SubmissionCommentComponent
+            :comment="comment"
+            :depth="0"
+            :collapsed-comments="collapsedComments"
+            :get-display-name="getDisplayName"
+            :is-authenticated="isAuthenticated"
+            :current-user-pubkey="currentUserPubkey"
+            :replying-to-id="replyingToId"
+            :is-submitting-reply="isSubmittingComment"
+            @toggle-collapse="toggleCollapse"
+            @reply="startReply"
+            @cancel-reply="cancelReply"
+            @submit-reply="submitReply"
+            @upvote="onCommentUpvote"
+            @downvote="onCommentDownvote"
+          />
+        </template>
+      </section>
+    </main>
+
+    <!-- Not found state -->
+    <div v-else class="max-w-4xl mx-auto p-4">
+      <div class="text-center py-16">
+        <FileText class="h-12 w-12 text-muted-foreground mx-auto mb-4" />
+        <p class="text-sm text-muted-foreground">Submission not found</p>
+        <Button variant="outline" size="sm" class="mt-4" @click="goBack">
+          Go Back
+        </Button>
+      </div>
+    </div>
+  </div>
+</template>
diff --git a/src/modules/nostr-feed/components/SubmissionList.vue b/src/modules/nostr-feed/components/SubmissionList.vue
index e635ad0..ec79ee2 100644
--- a/src/modules/nostr-feed/components/SubmissionList.vue
+++ b/src/modules/nostr-feed/components/SubmissionList.vue
@@ -120,7 +120,7 @@ function onSubmissionClick(submission: SubmissionWithMeta) {
 // Handle share
 function onShare(submission: SubmissionWithMeta) {
   // Copy link to clipboard or open share dialog
-  const url = `${window.location.origin}/post/${submission.id}`
+  const url = `${window.location.origin}/submission/${submission.id}`
   navigator.clipboard?.writeText(url)
   // TODO: Show toast notification
 }
diff --git a/src/modules/nostr-feed/components/SubmitComposer.vue b/src/modules/nostr-feed/components/SubmitComposer.vue
new file mode 100644
index 0000000..fcfd6bf
--- /dev/null
+++ b/src/modules/nostr-feed/components/SubmitComposer.vue
@@ -0,0 +1,406 @@
+<script setup lang="ts">
+/**
+ * SubmitComposer - Create new submissions (link, media, self posts)
+ * Similar to Lemmy's Create Post form
+ */
+
+import { ref, computed, watch } from 'vue'
+import { useRouter } from 'vue-router'
+import {
+  Link2,
+  FileText,
+  Image as ImageIcon,
+  Loader2,
+  ExternalLink,
+  X,
+  AlertCircle
+} from 'lucide-vue-next'
+import { Button } from '@/components/ui/button'
+import { Badge } from '@/components/ui/badge'
+import { tryInjectService, SERVICE_TOKENS } from '@/core/di-container'
+import type { SubmissionService } from '../services/SubmissionService'
+import type { LinkPreviewService } from '../services/LinkPreviewService'
+import type {
+  LinkPreview,
+  SubmissionType,
+  LinkSubmissionForm,
+  SelfSubmissionForm,
+  SubmissionForm
+} from '../types/submission'
+
+interface Props {
+  /** Pre-selected community */
+  community?: string
+  /** Initial post type */
+  initialType?: SubmissionType
+}
+
+const props = withDefaults(defineProps<Props>(), {
+  initialType: 'self'
+})
+
+const emit = defineEmits<{
+  (e: 'submitted', submissionId: string): void
+  (e: 'cancel'): void
+}>()
+
+const router = useRouter()
+
+// Services
+const submissionService = tryInjectService<SubmissionService>(SERVICE_TOKENS.SUBMISSION_SERVICE)
+const linkPreviewService = tryInjectService<LinkPreviewService>(SERVICE_TOKENS.LINK_PREVIEW_SERVICE)
+const authService = tryInjectService<any>(SERVICE_TOKENS.AUTH_SERVICE)
+
+// Auth state
+const isAuthenticated = computed(() => authService?.isAuthenticated?.value || false)
+
+// Form state
+const postType = ref<SubmissionType>(props.initialType)
+const title = ref('')
+const url = ref('')
+const body = ref('')
+const thumbnailUrl = ref('')
+const nsfw = ref(false)
+
+// Link preview state
+const linkPreview = ref<LinkPreview | null>(null)
+const isLoadingPreview = ref(false)
+const previewError = ref<string | null>(null)
+
+// Submission state
+const isSubmitting = ref(false)
+const submitError = ref<string | null>(null)
+
+// Validation
+const isValid = computed(() => {
+  if (!title.value.trim()) return false
+  if (postType.value === 'link' && !url.value.trim()) return false
+  if (postType.value === 'self' && !body.value.trim()) return false
+  return true
+})
+
+// Debounced URL preview fetching
+let previewTimeout: ReturnType<typeof setTimeout> | null = null
+
+watch(url, (newUrl) => {
+  if (previewTimeout) {
+    clearTimeout(previewTimeout)
+  }
+
+  linkPreview.value = null
+  previewError.value = null
+
+  if (!newUrl.trim() || postType.value !== 'link') {
+    return
+  }
+
+  // Validate URL format
+  try {
+    new URL(newUrl)
+  } catch {
+    return
+  }
+
+  // Debounce the preview fetch
+  previewTimeout = setTimeout(async () => {
+    await fetchLinkPreview(newUrl)
+  }, 500)
+})
+
+async function fetchLinkPreview(urlToFetch: string) {
+  if (!linkPreviewService) {
+    previewError.value = 'Link preview service not available'
+    return
+  }
+
+  isLoadingPreview.value = true
+  previewError.value = null
+
+  try {
+    const preview = await linkPreviewService.fetchPreview(urlToFetch)
+    linkPreview.value = preview
+  } catch (err: any) {
+    console.error('Failed to fetch link preview:', err)
+    previewError.value = err.message || 'Failed to load preview'
+  } finally {
+    isLoadingPreview.value = false
+  }
+}
+
+function clearPreview() {
+  linkPreview.value = null
+  previewError.value = null
+}
+
+async function handleSubmit() {
+  if (!isValid.value || !isAuthenticated.value || !submissionService) return
+
+  isSubmitting.value = true
+  submitError.value = null
+
+  try {
+    let form: SubmissionForm
+
+    if (postType.value === 'link') {
+      const linkForm: LinkSubmissionForm = {
+        postType: 'link',
+        title: title.value.trim(),
+        url: url.value.trim(),
+        body: body.value.trim() || undefined,
+        communityRef: props.community,
+        nsfw: nsfw.value
+      }
+      form = linkForm
+    } else if (postType.value === 'self') {
+      const selfForm: SelfSubmissionForm = {
+        postType: 'self',
+        title: title.value.trim(),
+        body: body.value.trim(),
+        communityRef: props.community,
+        nsfw: nsfw.value
+      }
+      form = selfForm
+    } else if (postType.value === 'media') {
+      // TODO: Implement media submission with file upload
+      submitError.value = 'Media uploads not yet implemented'
+      return
+    } else {
+      submitError.value = 'Unknown post type'
+      return
+    }
+
+    const submissionId = await submissionService.createSubmission(form)
+
+    if (submissionId) {
+      emit('submitted', submissionId)
+      // Navigate to the new submission
+      router.push({ name: 'submission-detail', params: { id: submissionId } })
+    } else {
+      submitError.value = 'Failed to create submission'
+    }
+  } catch (err: any) {
+    console.error('Failed to submit:', err)
+    submitError.value = err.message || 'Failed to create submission'
+  } finally {
+    isSubmitting.value = false
+  }
+}
+
+function handleCancel() {
+  emit('cancel')
+  router.back()
+}
+
+function selectPostType(type: SubmissionType) {
+  postType.value = type
+  // Clear URL when switching away from link type
+  if (type !== 'link') {
+    url.value = ''
+    clearPreview()
+  }
+}
+</script>
+
+<template>
+  <div class="max-w-2xl mx-auto p-4">
+    <h1 class="text-xl font-semibold mb-6">Create Post</h1>
+
+    <!-- Auth warning -->
+    <div v-if="!isAuthenticated" class="mb-4 p-4 bg-destructive/10 border border-destructive/20 rounded-lg">
+      <div class="flex items-center gap-2 text-destructive">
+        <AlertCircle class="h-4 w-4" />
+        <span class="text-sm font-medium">You must be logged in to create a post</span>
+      </div>
+    </div>
+
+    <!-- Post type selector -->
+    <div class="flex gap-2 mb-6">
+      <Button
+        :variant="postType === 'self' ? 'default' : 'outline'"
+        size="sm"
+        @click="selectPostType('self')"
+      >
+        <FileText class="h-4 w-4 mr-2" />
+        Text
+      </Button>
+      <Button
+        :variant="postType === 'link' ? 'default' : 'outline'"
+        size="sm"
+        @click="selectPostType('link')"
+      >
+        <Link2 class="h-4 w-4 mr-2" />
+        Link
+      </Button>
+      <Button
+        :variant="postType === 'media' ? 'default' : 'outline'"
+        size="sm"
+        @click="selectPostType('media')"
+        disabled
+        title="Coming soon"
+      >
+        <ImageIcon class="h-4 w-4 mr-2" />
+        Image
+      </Button>
+    </div>
+
+    <form @submit.prevent="handleSubmit" class="space-y-4">
+      <!-- Title -->
+      <div>
+        <label class="block text-sm font-medium mb-1.5">
+          Title <span class="text-destructive">*</span>
+        </label>
+        <input
+          v-model="title"
+          type="text"
+          placeholder="An interesting title"
+          maxlength="300"
+          class="w-full px-3 py-2 border rounded-lg bg-background focus:outline-none focus:ring-2 focus:ring-primary"
+          :disabled="!isAuthenticated"
+        />
+        <div class="text-xs text-muted-foreground mt-1 text-right">
+          {{ title.length }}/300
+        </div>
+      </div>
+
+      <!-- URL (for link posts) -->
+      <div v-if="postType === 'link'">
+        <label class="block text-sm font-medium mb-1.5">
+          URL <span class="text-destructive">*</span>
+        </label>
+        <input
+          v-model="url"
+          type="url"
+          placeholder="https://example.com/article"
+          class="w-full px-3 py-2 border rounded-lg bg-background focus:outline-none focus:ring-2 focus:ring-primary"
+          :disabled="!isAuthenticated"
+        />
+
+        <!-- Link preview -->
+        <div v-if="isLoadingPreview" class="mt-3 p-4 border rounded-lg bg-muted/30">
+          <div class="flex items-center gap-2 text-sm text-muted-foreground">
+            <Loader2 class="h-4 w-4 animate-spin" />
+            Loading preview...
+          </div>
+        </div>
+
+        <div v-else-if="previewError" class="mt-3 p-3 border border-destructive/20 rounded-lg bg-destructive/5">
+          <div class="flex items-center gap-2 text-sm text-destructive">
+            <AlertCircle class="h-4 w-4" />
+            {{ previewError }}
+          </div>
+        </div>
+
+        <div v-else-if="linkPreview" class="mt-3 p-4 border rounded-lg bg-muted/30">
+          <div class="flex items-start gap-3">
+            <!-- Preview image -->
+            <div v-if="linkPreview.image" class="flex-shrink-0 w-24 h-18 rounded overflow-hidden bg-muted">
+              <img
+                :src="linkPreview.image"
+                :alt="linkPreview.title || ''"
+                class="w-full h-full object-cover"
+              />
+            </div>
+
+            <!-- Preview content -->
+            <div class="flex-1 min-w-0">
+              <div class="flex items-center gap-2 text-xs text-muted-foreground mb-1">
+                <ExternalLink class="h-3 w-3" />
+                <span>{{ linkPreview.domain }}</span>
+                <button
+                  type="button"
+                  class="ml-auto p-1 hover:bg-accent rounded"
+                  @click="clearPreview"
+                >
+                  <X class="h-3 w-3" />
+                </button>
+              </div>
+              <h4 v-if="linkPreview.title" class="font-medium text-sm line-clamp-2">
+                {{ linkPreview.title }}
+              </h4>
+              <p v-if="linkPreview.description" class="text-xs text-muted-foreground mt-1 line-clamp-2">
+                {{ linkPreview.description }}
+              </p>
+            </div>
+          </div>
+        </div>
+      </div>
+
+      <!-- Thumbnail URL (optional) -->
+      <div v-if="postType === 'link'">
+        <label class="block text-sm font-medium mb-1.5">
+          Thumbnail URL
+          <span class="text-muted-foreground font-normal">(optional)</span>
+        </label>
+        <input
+          v-model="thumbnailUrl"
+          type="url"
+          placeholder="https://example.com/image.jpg"
+          class="w-full px-3 py-2 border rounded-lg bg-background focus:outline-none focus:ring-2 focus:ring-primary"
+          :disabled="!isAuthenticated"
+        />
+      </div>
+
+      <!-- Body -->
+      <div>
+        <label class="block text-sm font-medium mb-1.5">
+          Body
+          <span v-if="postType === 'self'" class="text-destructive">*</span>
+          <span v-else class="text-muted-foreground font-normal">(optional)</span>
+        </label>
+        <textarea
+          v-model="body"
+          :placeholder="postType === 'self' ? 'Write your post content...' : 'Optional description or commentary...'"
+          rows="6"
+          class="w-full px-3 py-2 border rounded-lg bg-background focus:outline-none focus:ring-2 focus:ring-primary resize-y min-h-[120px]"
+          :disabled="!isAuthenticated"
+        />
+        <div class="text-xs text-muted-foreground mt-1">
+          Markdown supported
+        </div>
+      </div>
+
+      <!-- NSFW toggle -->
+      <div class="flex items-center gap-2">
+        <input
+          id="nsfw"
+          v-model="nsfw"
+          type="checkbox"
+          class="rounded border-muted-foreground"
+          :disabled="!isAuthenticated"
+        />
+        <label for="nsfw" class="text-sm font-medium cursor-pointer">
+          NSFW
+        </label>
+        <Badge v-if="nsfw" variant="destructive" class="text-xs">
+          Not Safe For Work
+        </Badge>
+      </div>
+
+      <!-- Error message -->
+      <div v-if="submitError" class="p-3 border border-destructive/20 rounded-lg bg-destructive/5">
+        <div class="flex items-center gap-2 text-sm text-destructive">
+          <AlertCircle class="h-4 w-4" />
+          {{ submitError }}
+        </div>
+      </div>
+
+      <!-- Actions -->
+      <div class="flex items-center gap-3 pt-4">
+        <Button
+          type="submit"
+          :disabled="!isValid || isSubmitting || !isAuthenticated"
+        >
+          <Loader2 v-if="isSubmitting" class="h-4 w-4 animate-spin mr-2" />
+          Create
+        </Button>
+        <Button
+          type="button"
+          variant="outline"
+          @click="handleCancel"
+        >
+          Cancel
+        </Button>
+      </div>
+    </form>
+  </div>
+</template>
diff --git a/src/modules/nostr-feed/composables/useSubmissions.ts b/src/modules/nostr-feed/composables/useSubmissions.ts
index 241ad40..cdd457e 100644
--- a/src/modules/nostr-feed/composables/useSubmissions.ts
+++ b/src/modules/nostr-feed/composables/useSubmissions.ts
@@ -289,9 +289,27 @@ export function useSubmissions(options: UseSubmissionsOptions = {}): UseSubmissi
 export function useSubmission(submissionId: string) {
   const submissionService = tryInjectService<SubmissionService>(SERVICE_TOKENS.SUBMISSION_SERVICE)
 
+  const isLoading = ref(false)
+  const error = ref<string | null>(null)
+
   const submission = computed(() => submissionService?.getSubmission(submissionId))
   const comments = computed(() => submissionService?.getThreadedComments(submissionId) ?? [])
 
+  async function subscribe(): Promise<void> {
+    if (!submissionService) return
+
+    isLoading.value = true
+    error.value = null
+
+    try {
+      await submissionService.subscribeToSubmission(submissionId)
+    } catch (err: any) {
+      error.value = err.message || 'Failed to load submission'
+    } finally {
+      isLoading.value = false
+    }
+  }
+
   async function upvote(): Promise<void> {
     await submissionService?.upvote(submissionId)
   }
@@ -300,9 +318,17 @@ export function useSubmission(submissionId: string) {
     await submissionService?.downvote(submissionId)
   }
 
+  // Subscribe on mount
+  onMounted(() => {
+    subscribe()
+  })
+
   return {
     submission,
     comments,
+    isLoading: computed(() => isLoading.value || submissionService?.isLoading.value || false),
+    error: computed(() => error.value || submissionService?.error.value || null),
+    subscribe,
     upvote,
     downvote
   }
diff --git a/src/modules/nostr-feed/index.ts b/src/modules/nostr-feed/index.ts
index e73896e..af179fd 100644
--- a/src/modules/nostr-feed/index.ts
+++ b/src/modules/nostr-feed/index.ts
@@ -4,10 +4,13 @@ import { container, SERVICE_TOKENS } from '@/core/di-container'
 import NostrFeed from './components/NostrFeed.vue'
 import SubmissionList from './components/SubmissionList.vue'
 import SubmissionRow from './components/SubmissionRow.vue'
+import SubmissionDetail from './components/SubmissionDetail.vue'
+import SubmissionComment from './components/SubmissionComment.vue'
+import SubmitComposer from './components/SubmitComposer.vue'
 import VoteControls from './components/VoteControls.vue'
 import SortTabs from './components/SortTabs.vue'
 import { useFeed } from './composables/useFeed'
-import { useSubmissions } from './composables/useSubmissions'
+import { useSubmissions, useSubmission } from './composables/useSubmissions'
 import { FeedService } from './services/FeedService'
 import { ProfileService } from './services/ProfileService'
 import { ReactionService } from './services/ReactionService'
@@ -23,6 +26,27 @@ export const nostrFeedModule: ModulePlugin = {
   version: '1.0.0',
   dependencies: ['base'],
 
+  routes: [
+    {
+      path: '/submission/:id',
+      name: 'submission-detail',
+      component: () => import('./views/SubmissionDetailPage.vue'),
+      meta: {
+        title: 'Submission',
+        requiresAuth: false
+      }
+    },
+    {
+      path: '/submit',
+      name: 'submit-post',
+      component: () => import('./views/SubmitPage.vue'),
+      meta: {
+        title: 'Create Post',
+        requiresAuth: true
+      }
+    }
+  ],
+
   async install(app: App) {
     console.log('nostr-feed module: Starting installation...')
 
@@ -76,13 +100,17 @@ export const nostrFeedModule: ModulePlugin = {
     NostrFeed,
     SubmissionList,
     SubmissionRow,
+    SubmissionDetail,
+    SubmissionComment,
+    SubmitComposer,
     VoteControls,
     SortTabs
   },
 
   composables: {
     useFeed,
-    useSubmissions
+    useSubmissions,
+    useSubmission
   }
 }
 
diff --git a/src/modules/nostr-feed/services/ReactionService.ts b/src/modules/nostr-feed/services/ReactionService.ts
index 09a7e2f..24adfb7 100644
--- a/src/modules/nostr-feed/services/ReactionService.ts
+++ b/src/modules/nostr-feed/services/ReactionService.ts
@@ -427,6 +427,124 @@ export class ReactionService extends BaseService {
     }
   }
 
+  /**
+   * Send a dislike reaction to an event
+   */
+  async dislikeEvent(eventId: string, eventPubkey: string, eventKind: number): Promise<void> {
+    if (!this.authService?.isAuthenticated?.value) {
+      throw new Error('Must be authenticated to react')
+    }
+
+    if (!this.relayHub?.isConnected) {
+      throw new Error('Not connected to relays')
+    }
+
+    const userPubkey = this.authService.user.value?.pubkey
+    const userPrivkey = this.authService.user.value?.prvkey
+
+    if (!userPubkey || !userPrivkey) {
+      throw new Error('User keys not available')
+    }
+
+    // Check if user already disliked this event
+    const eventReactions = this.getEventReactions(eventId)
+    if (eventReactions.userHasDisliked) {
+      throw new Error('Already disliked this event')
+    }
+
+    try {
+      this._isLoading.value = true
+
+      // Create reaction event template according to NIP-25
+      const eventTemplate: EventTemplate = {
+        kind: 7, // Reaction
+        content: '-', // Dislike reaction
+        tags: [
+          ['e', eventId, '', eventPubkey], // Event being reacted to
+          ['p', eventPubkey], // Author of the event being reacted to
+          ['k', eventKind.toString()] // Kind of the event being reacted to
+        ],
+        created_at: Math.floor(Date.now() / 1000)
+      }
+
+      // Sign the event
+      const privkeyBytes = this.hexToUint8Array(userPrivkey)
+      const signedEvent = finalizeEvent(eventTemplate, privkeyBytes)
+
+      // Publish the reaction
+      await this.relayHub.publishEvent(signedEvent)
+
+      // Optimistically update local state
+      this.handleReactionEvent(signedEvent)
+
+    } catch (error) {
+      console.error('Failed to dislike event:', error)
+      throw error
+    } finally {
+      this._isLoading.value = false
+    }
+  }
+
+  /**
+   * Remove a dislike from an event using NIP-09 deletion events
+   */
+  async undislikeEvent(eventId: string): Promise<void> {
+    if (!this.authService?.isAuthenticated?.value) {
+      throw new Error('Must be authenticated to remove reaction')
+    }
+
+    if (!this.relayHub?.isConnected) {
+      throw new Error('Not connected to relays')
+    }
+
+    const userPubkey = this.authService.user.value?.pubkey
+    const userPrivkey = this.authService.user.value?.prvkey
+
+    if (!userPubkey || !userPrivkey) {
+      throw new Error('User keys not available')
+    }
+
+    // Get the user's reaction ID to delete
+    const eventReactions = this.getEventReactions(eventId)
+
+    if (!eventReactions.userHasDisliked || !eventReactions.userReactionId) {
+      throw new Error('No dislike reaction to remove')
+    }
+
+    try {
+      this._isLoading.value = true
+
+      // Create deletion event according to NIP-09
+      const eventTemplate: EventTemplate = {
+        kind: 5, // Deletion request
+        content: '', // Empty content or reason
+        tags: [
+          ['e', eventReactions.userReactionId], // The reaction event to delete
+          ['k', '7'] // Kind of event being deleted (reaction)
+        ],
+        created_at: Math.floor(Date.now() / 1000)
+      }
+
+      // Sign the event
+      const privkeyBytes = this.hexToUint8Array(userPrivkey)
+      const signedEvent = finalizeEvent(eventTemplate, privkeyBytes)
+
+      // Publish the deletion
+      const result = await this.relayHub.publishEvent(signedEvent)
+
+      console.log(`ReactionService: Dislike deletion published to ${result.success}/${result.total} relays`)
+
+      // Optimistically update local state
+      this.handleDeletionEvent(signedEvent)
+
+    } catch (error) {
+      console.error('Failed to remove dislike:', error)
+      throw error
+    } finally {
+      this._isLoading.value = false
+    }
+  }
+
   /**
    * Helper function to convert hex string to Uint8Array
    */
diff --git a/src/modules/nostr-feed/services/SubmissionService.ts b/src/modules/nostr-feed/services/SubmissionService.ts
index 2cd0f21..33e8900 100644
--- a/src/modules/nostr-feed/services/SubmissionService.ts
+++ b/src/modules/nostr-feed/services/SubmissionService.ts
@@ -148,6 +148,8 @@ export class SubmissionService extends BaseService {
         onEvent: (event: NostrEvent) => this.handleEvent(event),
         onEose: () => {
           this.debug('End of stored events')
+          // Refresh all submission votes from loaded reactions
+          this.refreshAllSubmissionVotes()
           this._isLoading.value = false
         },
         onClose: () => {
@@ -183,6 +185,82 @@ export class SubmissionService extends BaseService {
     }
   }
 
+  /**
+   * Subscribe to a specific submission and its comments
+   */
+  async subscribeToSubmission(submissionId: string): Promise<void> {
+    this._isLoading.value = true
+    this._error.value = null
+
+    try {
+      if (!this.relayHub?.isConnected) {
+        await this.relayHub?.connect()
+      }
+
+      const subscriptionId = `submission-${submissionId}-${Date.now()}`
+
+      // Build filters for the submission and its comments
+      const filters: Filter[] = [
+        // The submission itself
+        {
+          kinds: [SUBMISSION_KINDS.SUBMISSION],
+          ids: [submissionId]
+        },
+        // Comments referencing this submission (via 'e' tag - parent reference)
+        {
+          kinds: [SUBMISSION_KINDS.SUBMISSION],
+          '#e': [submissionId]
+        },
+        // Comments referencing this submission (via 'E' tag - root reference)
+        {
+          kinds: [SUBMISSION_KINDS.SUBMISSION],
+          '#E': [submissionId]
+        },
+        // Reactions on the submission and comments
+        {
+          kinds: [SUBMISSION_KINDS.REACTION],
+          '#e': [submissionId]
+        }
+      ]
+
+      this.debug('Subscribing to submission with filters:', filters)
+
+      const unsubscribe = this.relayHub.subscribe({
+        id: subscriptionId,
+        filters,
+        onEvent: (event: NostrEvent) => this.handleEvent(event),
+        onEose: () => {
+          this.debug('End of stored events for submission')
+          // Refresh submission votes from loaded reactions
+          this.refreshSubmissionVotes(submissionId)
+          // After loading comments, fetch their reactions
+          this.fetchCommentReactions(submissionId)
+          this._isLoading.value = false
+        },
+        onClose: () => {
+          this.debug('Submission subscription closed')
+        }
+      })
+
+      // Store for cleanup (don't overwrite main subscription)
+      // For now, we'll manage this separately
+      this.currentSubscription = subscriptionId
+      this.currentUnsubscribe = unsubscribe
+
+      // Timeout fallback
+      setTimeout(() => {
+        if (this._isLoading.value && this.currentSubscription === subscriptionId) {
+          this._isLoading.value = false
+        }
+      }, 10000)
+
+    } catch (err) {
+      this._error.value = err instanceof Error ? err.message : 'Failed to subscribe to submission'
+      this._isLoading.value = false
+      throw err
+    }
+  }
+
   /**
    * Build Nostr filters from feed configuration
    */
@@ -274,6 +352,12 @@ export class SubmissionService extends BaseService {
     }
     this.seenEventIds.add(event.id)
 
+    // Check if this is a top-level submission or a comment
+    if (this.isComment(event)) {
+      this.handleCommentEvent(event)
+      return
+    }
+
     // Parse the submission
     const submission = this.parseSubmission(event)
     if (!submission) {
@@ -281,12 +365,6 @@ export class SubmissionService extends BaseService {
       return
     }
 
-    // Check if this is a top-level submission or a comment
-    if (this.isComment(event)) {
-      this.handleCommentEvent(event)
-      return
-    }
-
     // Create full submission with metadata
     const submissionWithMeta = this.enrichSubmission(submission)
     this._submissions.set(submission.id, submissionWithMeta)
@@ -329,6 +407,12 @@ export class SubmissionService extends BaseService {
 
     const rootId = rootTag[1]
 
+    // Check for duplicate comment
+    const existingComments = this._comments.get(rootId)
+    if (existingComments?.some(c => c.id === event.id)) {
+      return
+    }
+
     // Parse as comment
     const comment: SubmissionComment = {
       id: event.id,
@@ -339,7 +423,7 @@ export class SubmissionService extends BaseService {
       parentId: this.getParentId(event) || rootId,
       depth: 0,
       replies: [],
-      votes: this.getDefaultVotes()
+      votes: this.getCommentVotes(event.id)
     }
 
     // Add to comments map
@@ -347,6 +431,12 @@ export class SubmissionService extends BaseService {
       this._comments.set(rootId, [])
     }
     this._comments.get(rootId)!.push(comment)
+
+    // Update comment count on the submission
+    const submission = this._submissions.get(rootId)
+    if (submission) {
+      submission.commentCount = this._comments.get(rootId)!.length
+    }
   }
 
   /**
@@ -617,6 +707,23 @@ export class SubmissionService extends BaseService {
     }
   }
 
+  /**
+   * Get votes for a comment from reaction service
+   */
+  private getCommentVotes(commentId: string): SubmissionVotes {
+    if (this.reactionService) {
+      const reactions = this.reactionService.getEventReactions(commentId)
+      return {
+        upvotes: reactions.likes || 0,
+        downvotes: reactions.dislikes || 0,
+        score: (reactions.likes || 0) - (reactions.dislikes || 0),
+        userVote: reactions.userHasLiked ? 'upvote' : reactions.userHasDisliked ? 'downvote' : null,
+        userVoteId: reactions.userReactionId
+      }
+    }
+    return this.getDefaultVotes()
+  }
+
   /**
    * Calculate ranking scores
    */
@@ -804,12 +911,23 @@ export class SubmissionService extends BaseService {
    * Downvote a submission
    */
   async downvote(submissionId: string): Promise<void> {
-    // TODO: Implement downvote using '-' reaction content
-    // For now, this is a placeholder that mirrors the upvote logic
     const submission = this._submissions.get(submissionId)
     if (!submission) throw new Error('Submission not found')
 
-    this.debug('Downvote not yet implemented')
+    if (submission.votes.userVote === 'downvote') {
+      // Remove downvote
+      await this.reactionService?.undislikeEvent(submissionId)
+    } else {
+      // Add downvote (ReactionService keeps only latest reaction per user)
+      await this.reactionService?.dislikeEvent(
+        submissionId,
+        submission.pubkey,
+        SUBMISSION_KINDS.SUBMISSION
+      )
+    }
+
+    // Refresh votes
+    this.refreshSubmissionVotes(submissionId)
   }
 
   /**
@@ -823,6 +941,77 @@ export class SubmissionService extends BaseService {
     submission.ranking = this.calculateRanking(submission, submission.votes)
   }
 
+  /**
+   * Refresh votes for all submissions
+   */
+  private refreshAllSubmissionVotes(): void {
+    for (const submissionId of this._submissions.keys()) {
+      this.refreshSubmissionVotes(submissionId)
+    }
+  }
+
+  /**
+   * Upvote a comment
+   */
+  async upvoteComment(submissionId: string, commentId: string): Promise<void> {
+    const comment = this.findComment(submissionId, commentId)
+    if (!comment) throw new Error('Comment not found')
+
+    if (comment.votes.userVote === 'upvote') {
+      // Remove upvote
+      await this.reactionService?.unlikeEvent(commentId)
+      comment.votes.userVote = null
+      comment.votes.upvotes = Math.max(0, comment.votes.upvotes - 1)
+    } else {
+      // Add upvote
+      await this.reactionService?.likeEvent(
+        commentId,
+        comment.pubkey,
+        SUBMISSION_KINDS.SUBMISSION
+      )
+      // If was downvoted, remove downvote
+      if (comment.votes.userVote === 'downvote') {
+        comment.votes.downvotes = Math.max(0, comment.votes.downvotes - 1)
+      }
+      comment.votes.userVote = 'upvote'
+      comment.votes.upvotes += 1
+    }
+
+    // Update score
+    comment.votes.score = comment.votes.upvotes - comment.votes.downvotes
+  }
+
+  /**
+   * Downvote a comment
+   */
+  async downvoteComment(submissionId: string, commentId: string): Promise<void> {
+    const comment = this.findComment(submissionId, commentId)
+    if (!comment) throw new Error('Comment not found')
+
+    if (comment.votes.userVote === 'downvote') {
+      // Remove downvote
+      await this.reactionService?.undislikeEvent(commentId)
+      comment.votes.userVote = null
+      comment.votes.downvotes = Math.max(0, comment.votes.downvotes - 1)
+    } else {
+      // Add downvote (ReactionService keeps only latest reaction per user)
+      await this.reactionService?.dislikeEvent(
+        commentId,
+        comment.pubkey,
+        SUBMISSION_KINDS.SUBMISSION
+      )
+      // If was upvoted, update local count
+      if (comment.votes.userVote === 'upvote') {
+        comment.votes.upvotes = Math.max(0, comment.votes.upvotes - 1)
+      }
+      comment.votes.userVote = 'downvote'
+      comment.votes.downvotes += 1
+    }
+
+    // Update score
+    comment.votes.score = comment.votes.upvotes - comment.votes.downvotes
+  }
+
   // ============================================================================
   // Sorting
   // ============================================================================
@@ -923,6 +1112,223 @@ export class SubmissionService extends BaseService {
     }
   }
 
+  /**
+   * Get sorted threaded comments
+   */
+  getSortedComments(
+    submissionId: string,
+    sort: 'best' | 'new' | 'old' | 'controversial' = 'best'
+  ): SubmissionComment[] {
+    const comments = this.getComments(submissionId)
+    const tree = this.buildCommentTree(comments)
+
+    // Apply custom sort to the tree
+    const compareFn = this.getCommentSortFn(sort)
+    tree.sort(compareFn)
+    tree.forEach(comment => this.sortReplies(comment, compareFn))
+
+    return tree
+  }
+
+  /**
+   * Get comparison function for comment sorting
+   */
+  private getCommentSortFn(
+    sort: 'best' | 'new' | 'old' | 'controversial'
+  ): (a: SubmissionComment, b: SubmissionComment) => number {
+    switch (sort) {
+      case 'best':
+        return (a, b) => b.votes.score - a.votes.score
+      case 'new':
+        return (a, b) => b.created_at - a.created_at
+      case 'old':
+        return (a, b) => a.created_at - b.created_at
+      case 'controversial':
+        return (a, b) => {
+          const aControversy = calculateControversyRank(a.votes.upvotes, a.votes.downvotes)
+          const bControversy = calculateControversyRank(b.votes.upvotes, b.votes.downvotes)
+          return bControversy - aControversy
+        }
+      default:
+        return (a, b) => b.votes.score - a.votes.score
+    }
+  }
+
+  /**
+   * Create a comment on a submission or reply to another comment
+   */
+  async createComment(
+    submissionId: string,
+    content: string,
+    parentCommentId?: string
+  ): Promise<string> {
+    this.requireAuth()
+
+    const userPubkey = this.authService.user.value?.pubkey
+    const userPrivkey = this.authService.user.value?.prvkey
+
+    if (!userPubkey || !userPrivkey) {
+      throw new Error('User keys not available')
+    }
+
+    // Get the root submission
+    const submission = this._submissions.get(submissionId)
+    if (!submission) {
+      throw new Error('Submission not found')
+    }
+
+    try {
+      this._isLoading.value = true
+
+      const tags: string[][] = []
+
+      // Root scope - the community (if submission has one)
+      if (submission.communityRef) {
+        const ref = parseCommunityRef(submission.communityRef)
+        if (ref) {
+          tags.push(['A', submission.communityRef])
+          tags.push(['K', '34550'])
+          tags.push(['P', ref.pubkey])
+        }
+      }
+
+      // Root reference - the submission
+      tags.push(['E', submissionId, '', submission.pubkey])
+
+      // Parent reference
+      if (parentCommentId) {
+        // Replying to a comment
+        const parentComment = this.findComment(submissionId, parentCommentId)
+        if (parentComment) {
+          tags.push(['e', parentCommentId, '', parentComment.pubkey])
+          tags.push(['p', parentComment.pubkey])
+        } else {
+          // Fallback to submission as parent
+          tags.push(['e', submissionId, '', submission.pubkey])
+          tags.push(['p', submission.pubkey])
+        }
+      } else {
+        // Top-level comment on submission
+        tags.push(['e', submissionId, '', submission.pubkey])
+        tags.push(['p', submission.pubkey])
+      }
+
+      tags.push(['k', '1111'])
+
+      const eventTemplate: EventTemplate = {
+        kind: SUBMISSION_KINDS.SUBMISSION,
+        content,
+        tags,
+        created_at: Math.floor(Date.now() / 1000)
+      }
+
+      // Sign
+      const privkeyBytes = this.hexToUint8Array(userPrivkey)
+      const signedEvent = finalizeEvent(eventTemplate, privkeyBytes)
+
+      // Publish
+      await this.relayHub.publishEvent(signedEvent)
+
+      // Handle locally - add to comments
+      const comment: SubmissionComment = {
+        id: signedEvent.id,
+        pubkey: signedEvent.pubkey,
+        created_at: signedEvent.created_at,
+        content: signedEvent.content,
+        rootId: submissionId,
+        parentId: parentCommentId || submissionId,
+        depth: 0,
+        replies: [],
+        votes: this.getDefaultVotes()
+      }
+
+      if (!this._comments.has(submissionId)) {
+        this._comments.set(submissionId, [])
+      }
+      this._comments.get(submissionId)!.push(comment)
+
+      // Update comment count on submission
+      const sub = this._submissions.get(submissionId)
+      if (sub) {
+        sub.commentCount = this.getCommentCount(submissionId)
+      }
+
+      return signedEvent.id
+
+    } finally {
+      this._isLoading.value = false
+    }
+  }
+
+  /**
+   * Find a comment by ID within a submission's comments
+   */
+  private findComment(submissionId: string, commentId: string): SubmissionComment | undefined {
+    const comments = this._comments.get(submissionId) || []
+    return comments.find(c => c.id === commentId)
+  }
+
+  /**
+   * Fetch reactions for all comments of a submission
+   */
+  private async fetchCommentReactions(submissionId: string): Promise<void> {
+    const comments = this._comments.get(submissionId)
+    if (!comments || comments.length === 0) return
+
+    const commentIds = comments.map(c => c.id)
+
+    this.debug('Fetching reactions for comments:', commentIds.length)
+
+    // Subscribe to reactions for all comment IDs
+    const filters: Filter[] = [
+      {
+        kinds: [SUBMISSION_KINDS.REACTION],
+        '#e': commentIds
+      }
+    ]
+
+    return new Promise<void>((resolve) => {
+      const subscriptionId = `comment-reactions-${submissionId}-${Date.now()}`
+
+      const unsubscribe = this.relayHub.subscribe({
+        id: subscriptionId,
+        filters,
+        onEvent: (event: NostrEvent) => {
+          // Route to reaction service
+          this.reactionService?.handleReactionEvent(event)
+        },
+        onEose: () => {
+          this.debug('End of comment reactions')
+          // Update all comment votes after reactions are loaded
+          this.updateCommentVotes(submissionId)
+          unsubscribe()
+          resolve()
+        },
+        onClose: () => {
+          resolve()
+        }
+      })
+
+      // Timeout fallback
+      setTimeout(() => {
+        unsubscribe()
+        resolve()
+      }, 5000)
+    })
+  }
+
+  /**
+   * Update votes for all comments from reaction service
+   */
+  private updateCommentVotes(submissionId: string): void {
+    const comments = this._comments.get(submissionId)
+    if (!comments) return
+
+    for (const comment of comments) {
+      comment.votes = this.getCommentVotes(comment.id)
+    }
+  }
+
   // ============================================================================
   // Utilities
   // ============================================================================
diff --git a/src/modules/nostr-feed/views/SubmissionDetailPage.vue b/src/modules/nostr-feed/views/SubmissionDetailPage.vue
new file mode 100644
index 0000000..5350651
--- /dev/null
+++ b/src/modules/nostr-feed/views/SubmissionDetailPage.vue
@@ -0,0 +1,18 @@
+<script setup lang="ts">
+/**
+ * SubmissionDetailPage - Page wrapper for submission detail view
+ * Extracts route params and passes to SubmissionDetail component
+ */
+
+import { computed } from 'vue'
+import { useRoute } from 'vue-router'
+import SubmissionDetail from '../components/SubmissionDetail.vue'
+
+const route = useRoute()
+
+const submissionId = computed(() => route.params.id as string)
+</script>
+
+<template>
+  <SubmissionDetail :submission-id="submissionId" />
+</template>
diff --git a/src/modules/nostr-feed/views/SubmitPage.vue b/src/modules/nostr-feed/views/SubmitPage.vue
new file mode 100644
index 0000000..129208a
--- /dev/null
+++ b/src/modules/nostr-feed/views/SubmitPage.vue
@@ -0,0 +1,35 @@
+<script setup lang="ts">
+/**
+ * SubmitPage - Page wrapper for submission composer
+ * Handles route query params for community pre-selection
+ */
+
+import { computed } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+import SubmitComposer from '../components/SubmitComposer.vue'
+
+const route = useRoute()
+const router = useRouter()
+
+// Get community from query param if provided (e.g., /submit?community=...)
+const community = computed(() => route.query.community as string | undefined)
+
+// Handle submission completion
+function onSubmitted(submissionId: string) {
+  // Navigation is handled by SubmitComposer
+  console.log('Submission created:', submissionId)
+}
+
+// Handle cancel - go back
+function onCancel() {
+  router.back()
+}
+</script>
+
+<template>
+  <SubmitComposer
+    :community="community"
+    @submitted="onSubmitted"
+    @cancel="onCancel"
+  />
+</template>
diff --git a/src/pages/LinkAggregatorTest.vue b/src/pages/LinkAggregatorTest.vue
index 1b45c5b..dc06938 100644
--- a/src/pages/LinkAggregatorTest.vue
+++ b/src/pages/LinkAggregatorTest.vue
@@ -321,6 +321,7 @@
 
 <script setup lang="ts">
 import { ref, computed, onMounted, onUnmounted } from 'vue'
+import { useRouter } from 'vue-router'
 import { MessageSquare, Share2, Bookmark, EyeOff, Send, Loader2, ChevronDown, ChevronUp, Wifi, WifiOff } from 'lucide-vue-next'
 import { SimplePool, finalizeEvent, generateSecretKey, getPublicKey, type Event as NostrEvent } from 'nostr-tools'
 import { bytesToHex, hexToBytes } from '@noble/hashes/utils'
@@ -331,6 +332,8 @@ import SubmissionThumbnail from '@/modules/nostr-feed/components/SubmissionThumb
 import { tryInjectService, SERVICE_TOKENS } from '@/core/di-container'
 import type { SortType, TimeRange, VoteType } from '@/modules/nostr-feed/types/submission'
 
+const router = useRouter()
+
 // View mode
 const viewMode = ref<'submissions' | 'mock'>('mock')
 
@@ -710,6 +713,6 @@ function onMockDownvote(submission: MockSubmission) {
 // Real submission click handler
 function onSubmissionClick(submission: any) {
   console.log('Clicked submission:', submission)
-  // TODO: Navigate to detail view
+  router.push({ name: 'submission-detail', params: { id: submission.id } })
 }
 </script>