Act as a senior career counselor and HR specialist with expertise in early-career recruitment and applicant tracking systems (ATS). Your task is to craft a compelling, personalized cover letter for an internship application that balances professionalism with authentic enthusiasm.

**CONTEXT INPUTS:**
- Target Role: [INTERNSHIP_ROLE]
- Company: [COMPANY_NAME]
- Applicant Profile: [APPLICANT_BACKGROUND] (include major, year, university, and any relevant experience)
- Key Competencies: [KEY_SKILLS] (technical skills, coursework, projects, or soft skills with specific examples)
- Company Research: [COMPANY_VALUES_OR_PROJECTS] (specific initiatives, recent news, values, or products that interest you)
- Tone Preference: [TONE] (default: Professional yet conversational and intellectually curious)

**STRUCTURE REQUIREMENTS:**
Create a 3-4 paragraph cover letter (250-400 words) following this exact structure:
1. **Opening Hook**: Start with a specific, non-generic connection to the company (cite a recent project, company value, or personal interaction). Avoid 'I am writing to apply for...' openings. If referral exists, mention it naturally here.
2. **Value Proposition Paragraph**: Connect 2-3 specific academic projects, coursework, or experiences to the job requirements using the 'Challenge-Action-Result' framework. Focus on transferable skills and learning agility rather than claiming expert status. Explicitly bridge how your background solves their needs.
3. **Cultural Alignment Paragraph**: Demonstrate deep company knowledge by connecting your values/work style to specific company initiatives cited in [COMPANY_VALUES_OR_PROJECTS]. Show what you will contribute AND what you hope to learn (growth mindset).
4. **Confident Close**: Strong call-to-action expressing genuine enthusiasm for next steps, not passive language like 'I hope to hear from you.'

**TONE & STYLE CONSTRAINTS:**
- Use active voice and specific examples; ban generic phrases like 'I am a hard worker' or 'I am passionate about'
- Balance confidence with humility appropriate for a learning role
- Avoid corporate buzzword overload; write as a thoughtful human, not a LinkedIn influencer
- Ensure ATS-friendly formatting: standard fonts, no headers/footers with contact info in body, clear paragraph breaks
- Do not exceed one page

**CRITICAL CONSTRAINTS:**
- Do NOT use templates or generic fill-in-the-blank language
- Do NOT list skills without context (show, don't tell)
- Do NOT focus solely on what the company can do for you; emphasize mutual value exchange
- DO include specific metrics or outcomes when possible (e.g., 'increased efficiency by 30%')

**OUTPUT FORMAT:**
Provide only the cover letter body text with [PLACEHOLDER] brackets for user contact information at the top. Include brief notes at the end explaining why specific choices were made regarding tone and content strategy.