diff --git a/Cargo.lock b/Cargo.lock
index 16477da..8370382 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -432,6 +432,7 @@ name = "biliup"
 version = "1.2.8"
 dependencies = [
  "async-trait",
+ "axum",
  "base64",
  "bon",
  "byteorder",
diff --git a/crates/biliup/Cargo.toml b/crates/biliup/Cargo.toml
index e1cdda9..cc96510 100644
--- a/crates/biliup/Cargo.toml
+++ b/crates/biliup/Cargo.toml
@@ -46,6 +46,7 @@ libsm = "0.6.0"
 tracing-subscriber = { workspace = true, features = ["env-filter"] }  # 添加特性（特性是累加的）  }
 tempfile = "3.14"
 http = "1"
+axum = "0.8"
 
 [features]
 cli = ["clap"]
diff --git a/crates/biliup/src/uploader.rs b/crates/biliup/src/uploader.rs
index ecfe68b..42c659f 100644
--- a/crates/biliup/src/uploader.rs
+++ b/crates/biliup/src/uploader.rs
@@ -14,6 +14,7 @@ use std::task::{Context, Poll};
 pub mod bilibili;
 pub mod credential;
 pub mod line;
+pub mod season;
 pub mod util;
 
 #[derive(Deserialize, Serialize, Debug, Clone)]
diff --git a/crates/biliup/src/uploader/bilibili.rs b/crates/biliup/src/uploader/bilibili.rs
index 67bc88a..9cb3475 100644
--- a/crates/biliup/src/uploader/bilibili.rs
+++ b/crates/biliup/src/uploader/bilibili.rs
@@ -834,7 +834,7 @@ impl BiliBili {
         Err(Kind::Custom(result.message))
     }
 
-    fn get_csrf(&self) -> Result<&str> {
+    pub(crate) fn get_csrf(&self) -> Result<&str> {
         let csrf = self
             .login_info
             .cookie_info
diff --git a/crates/biliup/src/uploader/season.rs b/crates/biliup/src/uploader/season.rs
new file mode 100644
index 0000000..b14bd58
--- /dev/null
+++ b/crates/biliup/src/uploader/season.rs
@@ -0,0 +1,815 @@
+//! 合集（season）管理：列合集、查小节、公共稿件信息、加入 / 移出小节、排序。
+//!
+//! 接口与参数对齐 `biliup/plugins/bili_webup.py` 里 `list_seasons` 到
+//! `sort_season_episodes` 的实现。响应结构体只声明用得到的字段，其余字段收进
+//! `extra`，B 站新增字段不会导致解析失败。
+
+use crate::error::{Kind, Result};
+use crate::uploader::bilibili::BiliBili;
+use serde::{Deserialize, Deserializer, Serialize};
+use serde_json::{Map, Value, json};
+use std::time::Duration;
+
+const MEMBER_HOST: &str = "https://member.bilibili.com";
+const API_HOST: &str = "https://api.bilibili.com";
+const TIMEOUT: Duration = Duration::from_secs(10);
+const SORT_TIMEOUT: Duration = Duration::from_secs(15);
+
+fn null_as_default<'de, D, T>(deserializer: D) -> std::result::Result<T, D::Error>
+where
+    D: Deserializer<'de>,
+    T: Default + Deserialize<'de>,
+{
+    Ok(Option::<T>::deserialize(deserializer)?.unwrap_or_default())
+}
+
+/// `list_seasons` 的返回：一页合集。
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SeasonPage {
+    #[serde(default, deserialize_with = "null_as_default")]
+    pub seasons: Vec<SeasonEntry>,
+    #[serde(default)]
+    pub total: Option<u64>,
+    #[serde(flatten)]
+    pub extra: Map<String, Value>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SeasonEntry {
+    pub season: SeasonInfo,
+    #[serde(default, deserialize_with = "null_as_default")]
+    pub sections: SectionList,
+    #[serde(flatten)]
+    pub extra: Map<String, Value>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SeasonInfo {
+    pub id: u64,
+    #[serde(default)]
+    pub title: String,
+    #[serde(flatten)]
+    pub extra: Map<String, Value>,
+}
+
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct SectionList {
+    #[serde(default, deserialize_with = "null_as_default")]
+    pub sections: Vec<SectionInfo>,
+    #[serde(flatten)]
+    pub extra: Map<String, Value>,
+}
+
+/// 合集下的小节；每个合集至少有一个默认小节（通常叫「正片」）。
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SectionInfo {
+    pub id: u64,
+    #[serde(default)]
+    pub title: String,
+    #[serde(default, rename = "seasonId")]
+    pub season_id: Option<u64>,
+    #[serde(flatten)]
+    pub extra: Map<String, Value>,
+}
+
+/// `get_season_section` 的返回：小节信息和其中的稿件。
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SectionDetail {
+    pub section: SectionInfo,
+    #[serde(default, deserialize_with = "null_as_default")]
+    pub episodes: Vec<Episode>,
+    #[serde(flatten)]
+    pub extra: Map<String, Value>,
+}
+
+/// 小节里的一条稿件。`id` 是合集内部的 episode id，不是 aid。
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Episode {
+    pub id: u64,
+    pub aid: u64,
+    #[serde(default)]
+    pub cid: u64,
+    #[serde(default)]
+    pub title: String,
+    #[serde(flatten)]
+    pub extra: Map<String, Value>,
+}
+
+/// `api.bilibili.com/x/web-interface/view` 的返回，任何公开稿件都能查。
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ArchiveView {
+    pub aid: u64,
+    #[serde(default)]
+    pub bvid: String,
+    #[serde(default)]
+    pub title: String,
+    #[serde(default)]
+    pub cid: u64,
+    #[serde(default, deserialize_with = "null_as_default")]
+    pub pages: Vec<ViewPage>,
+    #[serde(flatten)]
+    pub extra: Map<String, Value>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ViewPage {
+    pub cid: u64,
+    #[serde(default)]
+    pub page: u32,
+    #[serde(default)]
+    pub part: String,
+    #[serde(flatten)]
+    pub extra: Map<String, Value>,
+}
+
+impl ArchiveView {
+    /// 第一个分 P 的 cid，加入合集时用它。
+    pub fn first_cid(&self) -> u64 {
+        self.pages.first().map_or(self.cid, |page| page.cid)
+    }
+}
+
+/// 加入小节时每条稿件的参数。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct EpisodeAdd {
+    pub aid: u64,
+    pub cid: u64,
+    pub title: String,
+    pub charging_pay: u8,
+}
+
+impl From<&ArchiveView> for EpisodeAdd {
+    fn from(view: &ArchiveView) -> Self {
+        Self {
+            aid: view.aid,
+            cid: view.first_cid(),
+            title: view.title.clone(),
+            charging_pay: 0,
+        }
+    }
+}
+
+/// 排序时每条稿件的新位置；`sort` 从 1 开始。
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub struct EpisodeSort {
+    pub id: u64,
+    pub sort: u32,
+}
+
+struct SeasonApi<'a> {
+    bili: &'a BiliBili,
+    member: &'a str,
+    api: &'a str,
+}
+
+impl BiliBili {
+    fn season_api(&self) -> SeasonApi<'_> {
+        SeasonApi {
+            bili: self,
+            member: MEMBER_HOST,
+            api: API_HOST,
+        }
+    }
+
+    /// 列出自己的合集，`pn` 从 1 开始。
+    pub async fn seasons(&self, pn: u32, ps: u32) -> Result<SeasonPage> {
+        self.season_api().seasons(pn, ps).await
+    }
+
+    /// 查询小节及其中的稿件；`sort` 目前 B 站只认 `"desc"`。
+    pub async fn season_section(
+        &self,
+        section_id: u64,
+        sort: Option<&str>,
+    ) -> Result<SectionDetail> {
+        self.season_api().season_section(section_id, sort).await
+    }
+
+    /// 查询公开稿件信息（标题、cid 等），不要求是自己的稿件。
+    pub async fn archive_view(&self, aid: u64) -> Result<ArchiveView> {
+        self.season_api().archive_view(aid).await
+    }
+
+    /// 把稿件加入小节，可一次加入多条。
+    pub async fn add_to_season(&self, section_id: u64, episodes: &[EpisodeAdd]) -> Result<()> {
+        self.season_api().add_to_season(section_id, episodes).await
+    }
+
+    /// 从合集移出一条稿件；参数是 [`Episode::id`]，不是 aid。
+    pub async fn remove_from_season(&self, episode_id: u64) -> Result<()> {
+        self.season_api().remove_from_season(episode_id).await
+    }
+
+    /// 重排小节里的稿件。`sorts` 必须覆盖小节里的全部稿件，
+    /// `section_id`、`season_id`、`section_title` 缺一不可，否则 B 站返回 -400。
+    pub async fn sort_season_episodes(
+        &self,
+        section_id: u64,
+        season_id: u64,
+        sorts: &[EpisodeSort],
+        section_title: &str,
+    ) -> Result<()> {
+        self.season_api()
+            .sort_season_episodes(section_id, season_id, sorts, section_title)
+            .await
+    }
+}
+
+impl SeasonApi<'_> {
+    async fn seasons(&self, pn: u32, ps: u32) -> Result<SeasonPage> {
+        let request = self
+            .bili
+            .client
+            .get(format!("{}/x2/creative/web/seasons", self.member))
+            .query(&[
+                ("pn", pn.to_string()),
+                ("ps", ps.to_string()),
+                ("order", "mtime".into()),
+                ("sort", "desc".into()),
+                ("draft", "1".into()),
+            ]);
+        let data = call(request, TIMEOUT, "list seasons").await?;
+        Ok(serde_json::from_value(data)?)
+    }
+
+    async fn season_section(&self, section_id: u64, sort: Option<&str>) -> Result<SectionDetail> {
+        let mut query = vec![("id", section_id.to_string())];
+        if let Some(sort) = sort.filter(|sort| !sort.is_empty()) {
+            query.push(("sort", sort.to_string()));
+        }
+        let request = self
+            .bili
+            .client
+            .get(format!("{}/x2/creative/web/season/section", self.member))
+            .query(&query);
+        let data = call(request, TIMEOUT, "get season section").await?;
+        Ok(serde_json::from_value(data)?)
+    }
+
+    async fn archive_view(&self, aid: u64) -> Result<ArchiveView> {
+        let request = self
+            .bili
+            .client
+            .get(format!("{}/x/web-interface/view", self.api))
+            .query(&[("aid", aid)]);
+        let data = call(request, TIMEOUT, "get archive view").await?;
+        Ok(serde_json::from_value(data)?)
+    }
+
+    async fn add_to_season(&self, section_id: u64, episodes: &[EpisodeAdd]) -> Result<()> {
+        let csrf = self.bili.get_csrf()?;
+        let request = self
+            .bili
+            .client
+            .post(format!(
+                "{}/x2/creative/web/season/section/episodes/add",
+                self.member
+            ))
+            .query(&[("csrf", csrf)])
+            .json(&json!({
+                "sectionId": section_id,
+                "episodes": episodes,
+                "csrf": csrf,
+            }));
+        call(request, TIMEOUT, "add to season").await?;
+        Ok(())
+    }
+
+    async fn remove_from_season(&self, episode_id: u64) -> Result<()> {
+        let csrf = self.bili.get_csrf()?;
+        let request = self
+            .bili
+            .client
+            .post(format!(
+                "{}/x2/creative/web/season/section/episode/del",
+                self.member
+            ))
+            .form(&[("id", episode_id.to_string()), ("csrf", csrf.to_string())]);
+        call(request, TIMEOUT, "remove from season").await?;
+        Ok(())
+    }
+
+    async fn sort_season_episodes(
+        &self,
+        section_id: u64,
+        season_id: u64,
+        sorts: &[EpisodeSort],
+        section_title: &str,
+    ) -> Result<()> {
+        let csrf = self.bili.get_csrf()?;
+        let request = self
+            .bili
+            .client
+            .post(format!(
+                "{}/x2/creative/web/season/section/edit",
+                self.member
+            ))
+            .query(&[("csrf", csrf)])
+            .json(&json!({
+                "section": {
+                    "id": section_id,
+                    "type": 1,
+                    "seasonId": season_id,
+                    "title": section_title,
+                },
+                "sorts": sorts,
+                "captcha_token": "",
+            }));
+        call(request, SORT_TIMEOUT, "sort season episodes").await?;
+        Ok(())
+    }
+}
+
+/// 发出请求并检查 B 站的 `code`，成功时返回 `data`（可能是 `null`）。
+async fn call(request: reqwest::RequestBuilder, timeout: Duration, action: &str) -> Result<Value> {
+    let mut body: Value = request
+        .timeout(timeout)
+        .send()
+        .await?
+        .error_for_status()?
+        .json()
+        .await?;
+    match body["code"].as_i64() {
+        Some(0) => Ok(body["data"].take()),
+        Some(code) => Err(Kind::Custom(format!(
+            "{action} failed: code {code}, message {}",
+            body["message"].as_str().unwrap_or_default()
+        ))),
+        None => Err(Kind::Custom(format!(
+            "{action} failed: response has no code"
+        ))),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use axum::Router;
+    use axum::body::Bytes;
+    use axum::extract::State;
+    use axum::http::{HeaderMap, Method, Uri, header};
+    use std::collections::HashMap;
+    use std::sync::{Arc, Mutex};
+
+    const CSRF: &str = "test-csrf";
+
+    #[derive(Debug, Clone)]
+    struct Captured {
+        method: Method,
+        path: String,
+        query: HashMap<String, String>,
+        content_type: String,
+        body: Bytes,
+    }
+
+    impl Captured {
+        fn json(&self) -> Value {
+            serde_json::from_slice(&self.body).unwrap()
+        }
+
+        fn form(&self) -> HashMap<String, String> {
+            serde_urlencoded::from_bytes(&self.body).unwrap()
+        }
+    }
+
+    #[derive(Clone)]
+    struct FakeState {
+        response: Value,
+        captured: Arc<Mutex<Vec<Captured>>>,
+    }
+
+    struct FakeServer {
+        base: String,
+        captured: Arc<Mutex<Vec<Captured>>>,
+    }
+
+    impl FakeServer {
+        async fn start(response: Value) -> Self {
+            async fn handler(
+                State(state): State<FakeState>,
+                method: Method,
+                uri: Uri,
+                headers: HeaderMap,
+                body: Bytes,
+            ) -> axum::Json<Value> {
+                let query = uri
+                    .query()
+                    .map(|q| serde_urlencoded::from_str(q).unwrap())
+                    .unwrap_or_default();
+                let content_type = headers
+                    .get(header::CONTENT_TYPE)
+                    .and_then(|v| v.to_str().ok())
+                    .unwrap_or_default()
+                    .to_string();
+                state.captured.lock().unwrap().push(Captured {
+                    method,
+                    path: uri.path().to_string(),
+                    query,
+                    content_type,
+                    body,
+                });
+                axum::Json(state.response.clone())
+            }
+
+            let captured = Arc::new(Mutex::new(Vec::new()));
+            let app = Router::new().fallback(handler).with_state(FakeState {
+                response,
+                captured: captured.clone(),
+            });
+            let listener = tokio::net::TcpListener::bind("127.0.0.1:0").await.unwrap();
+            let base = format!("http://{}", listener.local_addr().unwrap());
+            tokio::spawn(async move { axum::serve(listener, app).await.unwrap() });
+            Self { base, captured }
+        }
+
+        fn only_request(&self) -> Captured {
+            let captured = self.captured.lock().unwrap();
+            assert_eq!(captured.len(), 1, "expected exactly one request");
+            captured[0].clone()
+        }
+    }
+
+    fn bili() -> BiliBili {
+        BiliBili {
+            client: reqwest::Client::new(),
+            login_info: serde_json::from_value(json!({
+                "cookie_info": {"cookies": [
+                    {"name": "SESSDATA", "value": "sess"},
+                    {"name": "bili_jct", "value": CSRF}
+                ]},
+                "sso": [],
+                "token_info": {
+                    "access_token": "",
+                    "expires_in": 0,
+                    "mid": 0,
+                    "refresh_token": ""
+                },
+                "platform": null
+            }))
+            .unwrap(),
+        }
+    }
+
+    fn api<'a>(bili: &'a BiliBili, server: &'a FakeServer) -> SeasonApi<'a> {
+        SeasonApi {
+            bili,
+            member: &server.base,
+            api: &server.base,
+        }
+    }
+
+    fn ok(data: Value) -> Value {
+        json!({"code": 0, "message": "0", "ttl": 1, "data": data})
+    }
+
+    fn failure() -> Value {
+        json!({"code": -101, "message": "账号未登录", "ttl": 1, "data": null})
+    }
+
+    fn assert_failure(result: Result<impl std::fmt::Debug>, action: &str) {
+        let message = result.unwrap_err().to_string();
+        assert!(message.contains(action), "{message}");
+        assert!(message.contains("code -101"), "{message}");
+    }
+
+    #[tokio::test]
+    async fn seasons_request_shape_and_parsing() {
+        let server = FakeServer::start(ok(json!({
+            "seasons": [{
+                "season": {"id": 7320255, "title": "我的合集", "isEnd": 0},
+                "sections": {"sections": [
+                    {"id": 8081933, "title": "正片", "seasonId": 7320255, "epCount": 2}
+                ]},
+                "part_episodes": null
+            }],
+            "total": 1,
+            "play_type": 1
+        })))
+        .await;
+        let bili = bili();
+
+        let page = api(&bili, &server).seasons(2, 10).await.unwrap();
+
+        let req = server.only_request();
+        assert_eq!(req.method, Method::GET);
+        assert_eq!(req.path, "/x2/creative/web/seasons");
+        let expected: HashMap<String, String> = [
+            ("pn", "2"),
+            ("ps", "10"),
+            ("order", "mtime"),
+            ("sort", "desc"),
+            ("draft", "1"),
+        ]
+        .into_iter()
+        .map(|(k, v)| (k.into(), v.into()))
+        .collect();
+        assert_eq!(req.query, expected);
+
+        assert_eq!(page.total, Some(1));
+        assert_eq!(page.extra["play_type"], 1);
+        let entry = &page.seasons[0];
+        assert_eq!(entry.season.id, 7320255);
+        assert_eq!(entry.season.title, "我的合集");
+        assert_eq!(entry.season.extra["isEnd"], 0);
+        let section = &entry.sections.sections[0];
+        assert_eq!(section.id, 8081933);
+        assert_eq!(section.season_id, Some(7320255));
+        assert_eq!(section.extra["epCount"], 2);
+    }
+
+    #[tokio::test]
+    async fn seasons_accepts_null_list() {
+        let server = FakeServer::start(ok(json!({"seasons": null, "total": 0}))).await;
+        let bili = bili();
+        let page = api(&bili, &server).seasons(1, 30).await.unwrap();
+        assert!(page.seasons.is_empty());
+    }
+
+    #[tokio::test]
+    async fn seasons_reports_api_error() {
+        let server = FakeServer::start(failure()).await;
+        let bili = bili();
+        assert_failure(api(&bili, &server).seasons(1, 30).await, "list seasons");
+    }
+
+    #[tokio::test]
+    async fn season_section_request_shape_and_parsing() {
+        let server = FakeServer::start(ok(json!({
+            "section": {"id": 8081933, "title": "正片", "seasonId": 7320255, "type": 1},
+            "episodes": [
+                {"id": 176218279, "aid": 12345, "cid": 67890, "title": "第一集", "order": 1}
+            ]
+        })))
+        .await;
+        let bili = bili();
+
+        let detail = api(&bili, &server)
+            .season_section(8081933, Some("desc"))
+            .await
+            .unwrap();
+
+        let req = server.only_request();
+        assert_eq!(req.method, Method::GET);
+        assert_eq!(req.path, "/x2/creative/web/season/section");
+        assert_eq!(req.query.len(), 2);
+        assert_eq!(req.query["id"], "8081933");
+        assert_eq!(req.query["sort"], "desc");
+
+        assert_eq!(detail.section.title, "正片");
+        assert_eq!(detail.section.season_id, Some(7320255));
+        let episode = &detail.episodes[0];
+        assert_eq!(episode.id, 176218279);
+        assert_eq!(episode.aid, 12345);
+        assert_eq!(episode.cid, 67890);
+        assert_eq!(episode.extra["order"], 1);
+    }
+
+    #[tokio::test]
+    async fn season_section_omits_empty_sort_and_accepts_null_episodes() {
+        let server = FakeServer::start(ok(json!({
+            "section": {"id": 1, "title": "正片"},
+            "episodes": null
+        })))
+        .await;
+        let bili = bili();
+
+        let detail = api(&bili, &server)
+            .season_section(1, Some(""))
+            .await
+            .unwrap();
+
+        let req = server.only_request();
+        assert_eq!(req.query.len(), 1);
+        assert_eq!(req.query["id"], "1");
+        assert!(detail.episodes.is_empty());
+    }
+
+    #[tokio::test]
+    async fn season_section_reports_api_error() {
+        let server = FakeServer::start(failure()).await;
+        let bili = bili();
+        assert_failure(
+            api(&bili, &server).season_section(1, None).await,
+            "get season section",
+        );
+    }
+
+    #[tokio::test]
+    async fn archive_view_request_shape_and_parsing() {
+        let server = FakeServer::start(ok(json!({
+            "aid": 12345,
+            "bvid": "BV1xx411c7mD",
+            "title": "测试稿件",
+            "cid": 67890,
+            "pages": [{"cid": 67890, "page": 1, "part": "P1", "duration": 60}],
+            "owner": {"mid": 1}
+        })))
+        .await;
+        let bili = bili();
+
+        let view = api(&bili, &server).archive_view(12345).await.unwrap();
+
+        let req = server.only_request();
+        assert_eq!(req.method, Method::GET);
+        assert_eq!(req.path, "/x/web-interface/view");
+        assert_eq!(req.query.len(), 1);
+        assert_eq!(req.query["aid"], "12345");
+
+        assert_eq!(view.bvid, "BV1xx411c7mD");
+        assert_eq!(view.first_cid(), 67890);
+        assert_eq!(view.pages[0].extra["duration"], 60);
+        assert_eq!(view.extra["owner"]["mid"], 1);
+        assert_eq!(
+            EpisodeAdd::from(&view),
+            EpisodeAdd {
+                aid: 12345,
+                cid: 67890,
+                title: "测试稿件".into(),
+                charging_pay: 0,
+            }
+        );
+    }
+
+    #[tokio::test]
+    async fn archive_view_reports_api_error() {
+        let server = FakeServer::start(failure()).await;
+        let bili = bili();
+        assert_failure(
+            api(&bili, &server).archive_view(1).await,
+            "get archive view",
+        );
+    }
+
+    #[tokio::test]
+    async fn add_to_season_request_shape() {
+        let server = FakeServer::start(ok(Value::Null)).await;
+        let bili = bili();
+        let episodes = [EpisodeAdd {
+            aid: 12345,
+            cid: 67890,
+            title: "测试稿件".into(),
+            charging_pay: 0,
+        }];
+
+        api(&bili, &server)
+            .add_to_season(8081933, &episodes)
+            .await
+            .unwrap();
+
+        let req = server.only_request();
+        assert_eq!(req.method, Method::POST);
+        assert_eq!(req.path, "/x2/creative/web/season/section/episodes/add");
+        assert_eq!(req.query.len(), 1);
+        assert_eq!(req.query["csrf"], CSRF);
+        assert!(req.content_type.starts_with("application/json"));
+        assert_eq!(
+            req.json(),
+            json!({
+                "sectionId": 8081933,
+                "episodes": [
+                    {"aid": 12345, "cid": 67890, "title": "测试稿件", "charging_pay": 0}
+                ],
+                "csrf": CSRF,
+            })
+        );
+    }
+
+    #[tokio::test]
+    async fn add_to_season_reports_api_error() {
+        let server = FakeServer::start(failure()).await;
+        let bili = bili();
+        assert_failure(
+            api(&bili, &server).add_to_season(1, &[]).await,
+            "add to season",
+        );
+    }
+
+    #[tokio::test]
+    async fn remove_from_season_request_shape() {
+        let server = FakeServer::start(ok(Value::Null)).await;
+        let bili = bili();
+
+        api(&bili, &server)
+            .remove_from_season(176218279)
+            .await
+            .unwrap();
+
+        let req = server.only_request();
+        assert_eq!(req.method, Method::POST);
+        assert_eq!(req.path, "/x2/creative/web/season/section/episode/del");
+        assert!(req.query.is_empty());
+        assert_eq!(req.content_type, "application/x-www-form-urlencoded");
+        let form = req.form();
+        assert_eq!(form.len(), 2);
+        assert_eq!(form["id"], "176218279");
+        assert_eq!(form["csrf"], CSRF);
+    }
+
+    #[tokio::test]
+    async fn remove_from_season_reports_api_error() {
+        let server = FakeServer::start(failure()).await;
+        let bili = bili();
+        assert_failure(
+            api(&bili, &server).remove_from_season(1).await,
+            "remove from season",
+        );
+    }
+
+    #[tokio::test]
+    async fn sort_season_episodes_request_shape() {
+        let server = FakeServer::start(ok(Value::Null)).await;
+        let bili = bili();
+        let sorts = [
+            EpisodeSort { id: 2, sort: 1 },
+            EpisodeSort { id: 1, sort: 2 },
+        ];
+
+        api(&bili, &server)
+            .sort_season_episodes(8081933, 7320255, &sorts, "正片")
+            .await
+            .unwrap();
+
+        let req = server.only_request();
+        assert_eq!(req.method, Method::POST);
+        assert_eq!(req.path, "/x2/creative/web/season/section/edit");
+        assert_eq!(req.query.len(), 1);
+        assert_eq!(req.query["csrf"], CSRF);
+        assert!(req.content_type.starts_with("application/json"));
+        assert_eq!(
+            req.json(),
+            json!({
+                "section": {"id": 8081933, "type": 1, "seasonId": 7320255, "title": "正片"},
+                "sorts": [{"id": 2, "sort": 1}, {"id": 1, "sort": 2}],
+                "captcha_token": "",
+            })
+        );
+    }
+
+    #[tokio::test]
+    async fn sort_season_episodes_reports_api_error() {
+        let server = FakeServer::start(failure()).await;
+        let bili = bili();
+        assert_failure(
+            api(&bili, &server)
+                .sort_season_episodes(1, 2, &[], "正片")
+                .await,
+            "sort season episodes",
+        );
+    }
+
+    #[tokio::test]
+    async fn write_calls_require_csrf_cookie() {
+        let server = FakeServer::start(ok(Value::Null)).await;
+        let mut bili = bili();
+        bili.login_info.cookie_info = json!({"cookies": []});
+
+        let api = api(&bili, &server);
+        assert!(api.add_to_season(1, &[]).await.is_err());
+        assert!(api.remove_from_season(1).await.is_err());
+        assert!(api.sort_season_episodes(1, 2, &[], "正片").await.is_err());
+        assert!(server.captured.lock().unwrap().is_empty());
+    }
+
+    #[tokio::test]
+    async fn http_error_status_is_reported() {
+        let app =
+            Router::new().fallback(|| async { (axum::http::StatusCode::PRECONDITION_FAILED, "") });
+        let listener = tokio::net::TcpListener::bind("127.0.0.1:0").await.unwrap();
+        let base = format!("http://{}", listener.local_addr().unwrap());
+        tokio::spawn(async move { axum::serve(listener, app).await.unwrap() });
+        let bili = bili();
+        let api = SeasonApi {
+            bili: &bili,
+            member: &base,
+            api: &base,
+        };
+        let message = api.seasons(1, 30).await.unwrap_err().to_string();
+        assert!(message.contains("412"), "{message}");
+    }
+
+    /// 真实账号只读冒烟：`BILIUP_SEASON_COOKIES=/path/to/cookies.json cargo test -p biliup -- --ignored season_live`
+    #[tokio::test]
+    #[ignore = "needs a real Bilibili cookie file in BILIUP_SEASON_COOKIES"]
+    async fn season_live_read_only() {
+        let path = std::env::var("BILIUP_SEASON_COOKIES")
+            .expect("set BILIUP_SEASON_COOKIES to a cookies.json path");
+        let bili = crate::credential::login_by_cookies(&path, None)
+            .await
+            .unwrap();
+
+        let page = bili.seasons(1, 30).await.unwrap();
+        println!("seasons: {}", page.seasons.len());
+        if let Some(section) = page
+            .seasons
+            .first()
+            .and_then(|entry| entry.sections.sections.first())
+        {
+            let detail = bili.season_section(section.id, None).await.unwrap();
+            println!("section {} episodes: {}", section.id, detail.episodes.len());
+            if let Some(episode) = detail.episodes.first() {
+                let view = bili.archive_view(episode.aid).await.unwrap();
+                assert_eq!(view.aid, episode.aid);
+            }
+        }
+    }
+}