Diagram Style Guide (4311101)

• Canvas: 1280×720 (16:9) for slides. Print drafts: 1600×1000.
• Grid/Margins: 32 px outer margin; align elements on 16/32 px grid.
• Typography: Inter/Helvetica, sizes 14/16/18; math subs via baseline-shift="sub".
• Strokes: primary 2 px #111; auxiliary 1 px #94a3b8.
• Palette: accents #0ea5e9 (blue), #ef4444 (red), #22c55e (green); fills #f8fafc/#eef2ff.
• Markers: arrowheads with 6 px markers; consistent direction left→right, top→down.
• Components: battery, R/L/C, meters, sources, ground drawn with consistent spans (80–160 px segments).
• Labels: short, declarative; formulas near elements; legend top-left; title + desc + aria-label per SVG.
• Accessibility: high-contrast strokes; avoid color-only encoding; annotate curves.
• Validation: xmllint; escape entities (&, <, >).

Keep each file self-contained (own <defs>), stable IDs, and deterministic ordering.