diff --git a/src/lib/server/api.ts b/src/lib/server/api.ts
index 423b7f7..baede5c 100644
--- a/src/lib/server/api.ts
+++ b/src/lib/server/api.ts
@@ -488,7 +488,7 @@ function notesCreate(
 	const user = requireAuth(db, args.token);
 	const topicId = args.topicId?.trim() ?? "";
 	const unitId = args.unitId?.trim() ?? "";
-	if (!topicId && !unitId) throw new Error("Select a topic or a unit");
+	if (!unitId) throw new Error("Select a unit");
 	const id = newId();
 	const now = Date.now();
 	db.exec("BEGIN");
@@ -597,7 +597,7 @@ function questionsCreate(
 	const user = requireAuth(db, args.token);
 	const topicId = args.topicId?.trim() ?? "";
 	const unitId = args.unitId?.trim() ?? "";
-	if (!topicId && !unitId) throw new Error("Select a topic or a unit");
+	if (!unitId) throw new Error("Select a unit");
 	const id = newId();
 	const now = Date.now();
 	db.exec("BEGIN");
diff --git a/src/routes/admin/+page.svelte b/src/routes/admin/+page.svelte
index 236546d..7a3945d 100644
--- a/src/routes/admin/+page.svelte
+++ b/src/routes/admin/+page.svelte
@@ -471,14 +471,18 @@
 			</a>
 		{/if}
 	{:else}
-		<div class="border-rule flex items-end justify-between gap-4 border-b pb-6">
+		<div
+			class="border-rule flex flex-col gap-4 border-b pb-6 sm:flex-row sm:items-end sm:justify-between"
+		>
 			<div>
 				<p class="kicker">Admin</p>
 				<h1 class="text-ink mt-2 font-serif text-4xl font-medium">Dashboard</h1>
 			</div>
-			<div class="flex gap-2">
+			<div class="flex flex-wrap gap-2" role="tablist" aria-label="Admin sections">
 				<button
 					type="button"
+					role="tab"
+					aria-selected={tab === "overview"}
 					class="chip {tab === 'overview' ? 'chip-active' : ''}"
 					onclick={() => (tab = "overview")}
 				>
@@ -486,6 +490,8 @@
 				</button>
 				<button
 					type="button"
+					role="tab"
+					aria-selected={tab === "units"}
 					class="chip {tab === 'units' ? 'chip-active' : ''}"
 					onclick={() => (tab = "units")}
 				>
@@ -493,6 +499,8 @@
 				</button>
 				<button
 					type="button"
+					role="tab"
+					aria-selected={tab === "accounts"}
 					class="chip {tab === 'accounts' ? 'chip-active' : ''}"
 					onclick={() => (tab = "accounts")}
 				>
@@ -500,6 +508,8 @@
 				</button>
 				<button
 					type="button"
+					role="tab"
+					aria-selected={tab === "notes"}
 					class="chip {tab === 'notes' ? 'chip-active' : ''}"
 					onclick={() => (tab = "notes")}
 				>
@@ -556,7 +566,7 @@
 
 					<div class="mt-6 flex items-end gap-3 overflow-x-auto pb-2">
 						{#each stats.weeks as week}
-							<div class="flex min-w-[72px] flex-1 flex-col items-center gap-1">
+							<div class="flex min-w-18 flex-1 flex-col items-center gap-1">
 								<div class="flex h-32 w-full items-end justify-center gap-1">
 									<div
 										class="bg-primary w-1/3 max-w-6"
diff --git a/src/routes/post/note/+page.svelte b/src/routes/post/note/+page.svelte
index 6b95277..af89c3d 100644
--- a/src/routes/post/note/+page.svelte
+++ b/src/routes/post/note/+page.svelte
@@ -78,8 +78,8 @@
 			return;
 		}
 		const hasUnit = useCustomUnit ? !!customUnit.trim() : !!selectedUnitId;
-		if (!selectedTopicId && !hasUnit) {
-			error = "Please select a topic or a unit";
+		if (!hasUnit) {
+			error = "Please select a unit";
 			return;
 		}
 
@@ -160,7 +160,6 @@
 		</div>
 
 		<div>
-			<p class="text-muted mb-3 text-xs">Choose at least one topic or unit.</p>
 			<div class="grid grid-cols-1 gap-6 sm:grid-cols-2">
 				<div>
 					<label for="topic" class="kicker mb-2 block">Topic (optional)</label>
@@ -202,6 +201,7 @@
 							bind:value={customUnit}
 							placeholder="e.g., SIT384"
 							class="field mt-2"
+							required
 						/>
 					{/if}
 				</div>
diff --git a/src/routes/post/question/+page.svelte b/src/routes/post/question/+page.svelte
index 6740c4c..fbe84c9 100644
--- a/src/routes/post/question/+page.svelte
+++ b/src/routes/post/question/+page.svelte
@@ -78,8 +78,8 @@
 			return;
 		}
 		const hasUnit = useCustomUnit ? !!customUnit.trim() : !!selectedUnitId;
-		if (!selectedTopicId && !hasUnit) {
-			error = "Please select a topic or a unit";
+		if (!hasUnit) {
+			error = "Please select a unit";
 			return;
 		}
 
@@ -162,7 +162,6 @@
 		</div>
 
 		<div>
-			<p class="text-muted mb-3 text-xs">Choose at least one topic or unit.</p>
 			<div class="grid grid-cols-1 gap-6 sm:grid-cols-2">
 				<div>
 					<label for="topic" class="kicker mb-2 block">Topic (optional)</label>
@@ -204,6 +203,7 @@
 							bind:value={customUnit}
 							placeholder="e.g., SIT384"
 							class="field mt-2"
+							required
 						/>
 					{/if}
 				</div>