Content Density

2026 Presentation Design Best Practices

Updated guidance for deck building. When this file conflicts with design-system.md, prefer these rules — they reflect current research on engagement, readability, and persuasion.

Typography

• Set body text minimum at 16px (text-base in Tailwind). Never use text-sm (14px) for body content.
• Follow the Major Third ratio (1.25x) for the full type scale:

• Never use arbitrary sizes like text-[42px] — stay on the scale.
• Set line height to 1.5x for body, 1.2x for headers.
• Limit to 2 typefaces maximum: one for display (Playfair Display), one for body (DM Sans), plus mono (JetBrains Mono) for technical labels.

Content Density

• Cap at 30-40 words per slide maximum.
• Enforce one message per slide. If it needs a full minute of explanation, split it.
• Target distribution: 20% text, 40% visuals, 40% whitespace.
• Favor graphs over tables, bullet points over paragraphs.
• Decks with a clear, focused message per slide are 43% more persuasive.

Slide Count

• Target 10-18 slides for the full deck.
• 10-slide decks achieve the highest completion rate (32% vs 22% average).
• Engagement drops sharply after 18 slides.
• Prioritize substance over count — cut filler slides ruthlessly.

Color

• Use 3-5 colors maximum per deck.
• Assign one accent color for emphasis on key metrics and CTAs.
• Give each chapter a distinct accent that carries through its slides.
• Never mix dark and light backgrounds arbitrarily within a single deck.
• Apply color semantics consistently:

Light vs Dark Mode

Dark Mode (default for Aldea)

• Stronger signal for tech/AI audiences. Modern and premium feel.
• Use deep navy or near-black bases (#0a0f1a to #1A1A2E) with white text.
• Vivid accent colors pop naturally on dark backgrounds.
• Matches the existing Aldea blueprint aesthetic.

Light Mode (use for specific audiences)

• Better for PDF distribution, printed decks, and non-technical audiences.
• Use off-white or soft gray bases (#FAFBFC, #F1F3F5) with dark text.
• Darken chapter accents for readability (e.g., #fbbf24 becomes #D97706).
• Test contrast ratios — light mode requires more careful accent tuning.

Data Visualization

• Make every chart readable without explanation.
• Include a 1-line interpretation caption on every graph.
• Prefer icon-based visualizations over traditional charts for simple comparisons.
• Use bold number callouts (72-120pt / text-7xl to text-9xl) for key metrics.
• Never use a table where a chart will suffice.
• Maintain consistent chart styling (colors, fonts, grid lines) across all slides.

Structural Best Practices

• Include a team slide. 96% of top-performing decks have one.
• Include client logos. 97% of top decks show them.
• Open with market pain, not technology. Lead with the problem.
• Show product early (slides 3-4) — screenshots, not architecture diagrams.
• Cite every metric. "95% failure rate" needs a source annotation.

Personalization

• Including the recipient's name or context yields +29% engagement.
• Adapting to the audience's domain yields +33% engagement.
• Combining both yields +47% improvement.
• When building for a known audience, tailor the opening slide, examples, and metric selections to their specific context.

Reconciliation with Aldea Design System

This file updates the following defaults from design-system.md:

All other design tokens (colors, spacing, grid, animations) remain unchanged. Apply the updated scale when building new decks; existing decks do not need retroactive changes.