diff --git a/internal/service/emby_series.go b/internal/service/emby_series.go
index ce652e5..7a7b15d 100644
--- a/internal/service/emby_series.go
+++ b/internal/service/emby_series.go
@@ -276,7 +276,9 @@ func (e *EmbyService) seasonsForSeries(series embySeriesGroup) []embySeasonGroup
 		}
 		season.Episodes = append(season.Episodes, episode)
 	}
-	sort.Ints(order)
+	sort.SliceStable(order, func(i, j int) bool {
+		return embySeasonSortOrder(order[i]) < embySeasonSortOrder(order[j])
+	})
 	out := make([]embySeasonGroup, 0, len(order))
 	for _, seasonNum := range order {
 		out = append(out, *bySeason[seasonNum])
diff --git a/internal/service/emby_series_hierarchy_test.go b/internal/service/emby_series_hierarchy_test.go
index 870a652..df58bb9 100644
--- a/internal/service/emby_series_hierarchy_test.go
+++ b/internal/service/emby_series_hierarchy_test.go
@@ -3,6 +3,7 @@ package service
 import (
 	"context"
 	"fmt"
+	"sort"
 	"testing"
 	"time"
 
@@ -272,6 +273,11 @@ func TestEmbySeparatesOVAAndOADFromSeasonOne(t *testing.T) {
 	if len(seasonItems) != 3 {
 		t.Fatalf("expected season 1, OVA and OAD separately, got %#v", seasonItems)
 	}
+	for i, want := range []int{1, embySeasonOVA, embySeasonOAD} {
+		if seasonItems[i]["IndexNumber"] != want {
+			t.Fatalf("season order [%d] = %#v, want %d", i, seasonItems[i], want)
+		}
+	}
 
 	seasonByIndex := make(map[int]map[string]any, len(seasonItems))
 	for _, season := range seasonItems {
@@ -306,6 +312,35 @@ func TestEmbySeparatesOVAAndOADFromSeasonOne(t *testing.T) {
 	}
 }
 
+func TestEmbySeasonSortOrderMatchesWeb(t *testing.T) {
+	seasons := []int{
+		embySeasonNCED,
+		embySeasonOAD,
+		2,
+		embySeasonTheatrical,
+		1,
+		embySeasonGenericSpecial,
+		embySeasonOVA,
+	}
+	sort.SliceStable(seasons, func(i, j int) bool {
+		return embySeasonSortOrder(seasons[i]) < embySeasonSortOrder(seasons[j])
+	})
+	want := []int{
+		1,
+		2,
+		embySeasonGenericSpecial,
+		embySeasonTheatrical,
+		embySeasonOVA,
+		embySeasonOAD,
+		embySeasonNCED,
+	}
+	for i := range want {
+		if seasons[i] != want[i] {
+			t.Fatalf("season order = %#v, want %#v", seasons, want)
+		}
+	}
+}
+
 func TestEmbySeasonCandidatesCoverPersistedSpecialNumbers(t *testing.T) {
 	for _, persisted := range []int{0, -1} {
 		candidates := embySeasonCandidates(persisted)
diff --git a/internal/service/emby_series_ids.go b/internal/service/emby_series_ids.go
index 71b5846..f2be6d8 100644
--- a/internal/service/emby_series_ids.go
+++ b/internal/service/emby_series_ids.go
@@ -208,6 +208,42 @@ func seasonName(seasonNum int) string {
 	return fmt.Sprintf("第 %d 季", seasonNum)
 }
 
+// embySeasonSortOrder mirrors the web UI's seasonSortOrder: regular seasons
+// first in ascending order, followed by specials in a stable category order.
+func embySeasonSortOrder(seasonNum int) int {
+	if seasonNum > 0 {
+		return seasonNum
+	}
+	switch seasonNum {
+	case embySeasonGenericSpecial:
+		return 1000
+	case embySeasonTheatrical:
+		return 1001
+	case embySeasonOVA:
+		return 1002
+	case embySeasonOAD:
+		return 1003
+	case embySeasonOVD:
+		return 1004
+	case embySeasonONA:
+		return 1005
+	case embySeasonExtra:
+		return 1006
+	case embySeasonBonus:
+		return 1007
+	case embySeasonOmake:
+		return 1008
+	case embySeasonPictureDrama:
+		return 1009
+	case embySeasonNCOP:
+		return 1010
+	case embySeasonNCED:
+		return 1011
+	default:
+		return 2000
+	}
+}
+
 func sortSeriesGroups(groups []embySeriesGroup, p ItemsParams) {
 	switch primarySupportedEmbySort(p.SortBy, false) {
 	case "sortname", "name":