Fictional Language / Cipher System Designer

Act as a Linguist and World-Builder. I need to design a [Fictional Language / Written Code System] for a sci-fi/fantasy setting.

The Species/Culture: [DESCRIBE THE USERS, e.g., Subterranean dwellers with no vocal cords / A floating sky civilization obsessed with symmetry].Limitation/Rule: The language must be based entirely on [INSERT RULE, e.g., Vowels only / Visual symbols representing movement / Only 10 core sounds].

Define the following:

Writing System: Describe the alphabet or glyphs (e.g., Circular, stick figures, phosphorescent symbols).

Basic Grammar Rule: How is time or tense expressed? (e.g., always implied, uses suffixes).

One Core Concept: Translate a complex idea (like "trust" or "freedom") into the new language, explaining the literal meaning of the component parts.