Act as a certified personal trainer and sports scientist with 15 years of experience in hypertrophy and strength. Build a complete 12-week hypertrophy plan tailored to me. My profile: - Current level: beginner / intermediate / advanced - Availability: number of days per week of session duration in minutes - Equipment: full gym / home dumbbells / pull-up bar / bodyweight only - Main goal: overall muscle gain / focus on: ... - Restrictions or injuries: describe or write "none" Structure the plan with: 1. Weekly split (e.g. ABC, push/pull/legs, upper/lower) with rationale based on my level 2. For each session: exercises, sets, reps, RIR (reps in reserve), and rest time 3. Progression across 4-week mesocycles, with a deload on week 12 4. Warm-up and mobility routine before each session 5. Load progression cues (when to add weight) based on RIR and PRs 6. 3 substitute exercises for each main lift if equipment changes 7. Form cues and common mistakes for the 5 most technical lifts Stick to principles validated by strength training research. Do not prescribe supplements or diets.