Question: What genre of role playing game was the Cortex System developed for?

Context paragraphs:
Cortex System: The Cortex System is a generic RPG system based on the "Sovereign Stone System ", and was developed by Margaret Weis Productions, Ltd for the Serenity Role Playing Game.  It was subsequently used for their licensed "Battlestar Galactica" and Supernatural RPGs, and brought out as a stand-alone system in the "Cortex System Role Playing Game" book (also called the "Cortex Classic System Role Playing Game").  Serenity, using the Cortex System, was the 2005 Origins Award Gamer's Choice Role Playing Game of the Year.

Reveal Fantasia: Reveal Fantasia (リーヴェルファンタジア～マリエルと妖精物語～ , Riberu Fantajia Marieru to Yousei Monogatari ) Is a Fantasy role playing video game released in 2002 for the PlayStation 2 console by Victor Interactive Software, Inc. in Japan.  The game involved an innovative concept of a role playing game involving no battles or fighting.  Its game play shows some influence from dating simulation games.  The game was never released outside Japan.

Online text-based role-playing game: An online text-based role playing game is a role-playing game played online using a solely text-based interface.  Online text-based role playing games date to 1978, with the creation of "MUD1", which began the MUD heritage that culminates in today's MMORPGs.  Some online-text based role playing games are video games, but some are organized and played entirely by humans through text-based communication.  Over the years, games have used TELNET, internet forums, IRC, email and social networking websites as their media.

LitRPG: LitRPG, short for "Literature Role Playing Game", is a literary genre based on combining all the key components of MMORPGs with science-fiction fantasy novels.  LitRPG is a literary genre where games or game-like challenges form an essential part of the landscape.  A LitRPG work simultaneously narrates the story of characters inside and outside of the game-world.  At least some of the characters in a LitRPG novel therefore understand that they are playing a game: they are 'meta-aware'.  So, while Tolkien's Lord of the Rings is a fantasy novel, a book about people creating avatars and interacting in a Lord of the Rings MMORPG would be a LitRPG novel.

The Aethra Chronicles: The Aethra Chronicles - Volume One: Celystra's Bane or The Aethra Chronicles (also known as Aethra for short) is a classic 1994 MS-DOS shareware computer role playing game.  The game was based on the Rolemaster game system, a Pencil & Paper role playing game.  It was developed mostly as a one-man project by Michael Lawrence with some help from others for the graphics and sound/music.

Cortex Plus: The Cortex Plus System is a toolkit RPG system that evolved from Margaret Weis Productions, Ltd's Cortex System.  It has been used for four published games and one published preview to date, and the design principles are in the Cortex Plus Hacker's Guide, a book of advice in how to create new games using Cortex Plus, and list of new games produced via kickstarter.  According to the Hacker's Guide there are three basic 'flavors' of Cortex Plus; Action, Drama, and Heroic.

Serenity Role Playing Game: Serenity Role Playing Game is a science fiction role-playing game released in 2005 and set in the universe of the movie "Serenity".  It was produced by Margaret Weis Productions, Ltd, and its mechanics were the first iteration of the Cortex System.  It won an Origins Award for best RPG in 2005 and Margaret Weis' license came to an end on January 31, 2011.

Supernatural Role Playing Game: The Supernatural Role Playing Game is a role-playing game by Margaret Weis Productions that was released in 2009.  It is based on the television series "Supernatural" and was the final game to use the Cortex System.

Merpcon: MerpCon is an acronym for "Middle-Earth Role Playing Convention", a role playing game convention dedicated solely to role-playing gaming in J.R.R. Tolkien's Middle-earth.  The event is held annually on the last weekend of July and runs for 3 days from Friday, through to the end of Sunday (and sometimes a little into the following Monday morning).  To date MerpCon has been held each year in Spokane, WA, USA.  Beginning in 2009 MerpCon began to transition to being called Tolkienmoot as this convention's venue began to expand to include more Tolkien-related activities, events, and guests beyond just role playing in Middle-earth.

Marvel Heroic Roleplaying: Marvel Heroic Roleplaying (MHRP), is the fourth role playing game set in the Marvel Universe, published Margaret Weis Productions under license from Marvel Comics.  It was a fast playing game using the Cortex Plus system, with the first volume published in early 2012.  In early 2013 Margaret Weis Productions announced they would not be renewing their license.

Supporting paragraphs: Cortex System Serenity Role Playing Game
Answer: science fiction