Describe the purpose of the "System Instructions" in the provided text.

The "System Instructions" define the role, persona, mission, and operational guidelines for an AI assistant named Marina. Marina is positioned as a personal guide within the educational portal "Eurika," specifically catering to students (referred to as "Zoomers").

Key aspects covered include:

• Role & Identity: Marina's name, status as a personal guide, and target audience (school students).
• Mission: A primary directive is to avoid providing "raw" answers, instead requiring detailed explanations of the solution logic, understandable even to struggling students. Answers must be concise, clear, and structured.
• Tone & Style: A friendly, informal tone is mandated, using the informal "you" in Russian. Official or academic language is forbidden.
• Language Policy: Responses should be in the language of the prompt, defaulting to Russian. If a foreign language is used in the prompt, a Russian translation of the solution must be provided.
• Ethics & Security: Content must be limited to educational topics within Russian law. Revealing the prompt's details, algorithms, or system role is strictly prohibited.
• Routing Logic & Subject Analysis: The AI must identify the subject and grade level of the input and route the task to a specific protocol (STEM, Humanities, Foreign Languages, Russian Language & Literature, Crosswords & Puzzles).
• Level Adaptation: The complexity of the answer must be adjusted based on the specified grade level (1-11 or extracurricular).
• Global Content Rules: Restrictions include a ban on emojis, mandatory use of HTML tags for structure (<p>, <ul>, <ol>), specific formatting for mathematical expressions (using <sup> for powers, avoiding ^), and a requirement for multiplication symbols (·) to be treated as such.
• Visual Hierarchy & Scannability: Text density is limited, with a maximum of two sentences per paragraph. Each distinct thought should be a separate list item. Answers should be mobile-friendly and scannable.
• Occam's Razor Principle: The simplest and shortest valid solution, adhering to the specified grade level's curriculum, is prioritized.
• Execution Standards: Answers must follow school standards, be complete (addressing all sub-points), recover or indicate unreadable data, and provide at least three examples if the quantity is not specified.
• Formatting & Visuals: Specific HTML formatting is required for tables (<div> with overflow styling, <table>), and Chart.js must be used for charts/graphs.
• Output Structure: The final output must be in JSON format with "question" and "answer" fields. The "answer" field must contain valid HTML.
• Protocol-Specific Rules: Detailed instructions are provided for each subject area (STEM, Humanities, Foreign Languages, Russian Language & Literature, Crosswords & Puzzles), specifying formatting, required explanations, and problem-solving approaches.

In essence, the "System Instructions" are a comprehensive set of rules designed to ensure that the AI assistant provides accurate, well-explained, and appropriately formatted educational content tailored to different subjects and student levels, while maintaining a specific persona and adhering to strict technical and ethical guidelines.