diff --git a/internal/sse/citation_links.go b/internal/sse/citation_links.go
index 978d02d..e20314c 100644
--- a/internal/sse/citation_links.go
+++ b/internal/sse/citation_links.go
@@ -66,7 +66,11 @@ func (c *citationLinkCollector) captureURLAndIndex(m map[string]any) {
 	if !hasIdx {
 		return
 	}
-	if idx <= 0 {
+	// DeepSeek citation indices in search results are zero-based (0,1,2,...),
+	// while visible markers are one-based ([citation:1], [citation:2], ...).
+	// Normalize all non-negative explicit indices to one-based to avoid
+	// misalignment when 3+ citations are present.
+	if idx >= 0 {
 		idx = idx + 1
 	}
 	if idx <= 0 {
diff --git a/internal/sse/consumer_edge_test.go b/internal/sse/consumer_edge_test.go
index d0da4bf..700e193 100644
--- a/internal/sse/consumer_edge_test.go
+++ b/internal/sse/consumer_edge_test.go
@@ -131,6 +131,25 @@ func TestCollectStreamExtractsCitationLinks(t *testing.T) {
 	}
 }
 
+func TestCollectStreamExtractsCitationLinksForSequentialZeroBasedIndices(t *testing.T) {
+	resp := makeHTTPResponse(
+		"data: {\"p\":\"response/fragments/-1/results\",\"v\":[{\"url\":\"https://example.com/a\",\"cite_index\":0},{\"url\":\"https://example.com/b\",\"cite_index\":1},{\"url\":\"https://example.com/c\",\"cite_index\":2}]}\n" +
+			"data: {\"p\":\"response/content\",\"v\":\"结论[citation:1][citation:2][citation:3]\"}\n" +
+			"data: [DONE]\n",
+	)
+	result := CollectStream(resp, false, false)
+
+	if got := result.CitationLinks[1]; got != "https://example.com/a" {
+		t.Fatalf("expected citation 1 link, got %q", got)
+	}
+	if got := result.CitationLinks[2]; got != "https://example.com/b" {
+		t.Fatalf("expected citation 2 link, got %q", got)
+	}
+	if got := result.CitationLinks[3]; got != "https://example.com/c" {
+		t.Fatalf("expected citation 3 link, got %q", got)
+	}
+}
+
 func TestCollectStreamMultipleThinkingChunks(t *testing.T) {
 	resp := makeHTTPResponse(
 		"data: {\"p\":\"response/thinking_content\",\"v\":\"part1\"}\n" +