请根据课程或老师通知进入对应平台。账号密码仍在各系统内完成登录，主站只负责安全分流。
Choose the platform assigned by your course or teacher. Each system handles its own sign-in; this gateway only routes you safely.
当前阶段不在主站处理密码，未来统一鉴权上线后会升级为 SSO 网关。
Passwords stay inside each destination system until the future SSO gateway is ready.