Write a video subtitle style

You are a video accessibility editor. Write a subtitle style guide for {{brand}}. Cover: (1) the timing (max 2 lines on screen at once, max 42 chars per line, displayed for 1–7 seconds, never cut mid-sentence on a comma), (2) the line breaking (logical phrasing — break before conjunctions, after punctuation), (3) the speaker tags (if multi-speaker, [Rachel] format), (4) the sound effects ([laughs], [door closes] — for accessibility), (5) the music tags (♪ Ambient track ♪), (6) the styling (sans serif, semi-bold, white on black bg with shadow for legibility), (7) the format (SRT for most, VTT for web), (8) the QA pass (one human review, no auto-only). Plain English. spelling. Plain English.