brand-config-authoring

Brand Config Authoring

Create BrandConfig JSON files that define the complete visual identity for the frontend-slides presentation system. The server-side enrichment pipeline uses the BrandConfig to wrap body-only HTML (generated by an LLM) with full CSS, JS, fonts, logos, and chrome.

Where things live

• Pydantic schema: storyline/storyline/api/schemas/report_style_schemas.py (source of truth)
• Working examples:
  • storyline/playground/styles/samplead/samplead-save-style-args.json (most complete)
  • storyline/playground/styles/evalart/evalart-save-style-args.json
  • storyline/playground/styles/cledara/cledara-save-style-args.json

---

Common Pitfalls

These are real bugs discovered during development. Every one of them caused broken presentations in production. Read this section BEFORE writing any config.

Pitfall 1: reset_and_base missing body/heading typography

Wrong -- bare reset with no font or scroll-snap declarations:

* { margin: 0; padding: 0; box-sizing: border-box; }

Right -- must include html scroll-snap, body font, and heading font rules at minimum:

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; overflow-x: hidden; }
html { scroll-snap-type: y mandatory; scroll-behavior: smooth; }
.slide { width: 100vw; height: 100vh; height: 100dvh; overflow: hidden;
         scroll-snap-align: start; display: flex; flex-direction: column;
         position: relative; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}
body { font-family: var(--font-body); font-size: var(--body-size);
       line-height: 1.4; color: var(--text-primary); background: var(--bg-deep);
       overflow-x: hidden; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.15; }
h1 { font-size: var(--title-size); }
h2 { font-size: var(--h2-size); }

Without this, no fonts are applied and text renders unstyled.

Pitfall 2: Slide types with null css_block

Wrong -- css_block set to null:

{
  "name": "Content Slide",
  "css_class": "slide slide-content",
  "css_block": null
}

Right -- every slide type MUST have a populated css_block with at minimum its background and text styling:

{
  "name": "Content Slide",
  "css_class": "slide slide-content",
  "css_block": ".slide-content { background: var(--bg-white); color: var(--text-primary); padding: var(--sp); } .slide-content h2 { color: var(--brand-primary); margin-bottom: var(--sp-sm); }"
}

Without this, slides have no background, no text colors, no layout.

Pitfall 3: stagger_delay must be a simple CSS duration

Wrong -- descriptive string:

"stagger_delay": "0.09s per child (nth-child(1): 0.04s, nth-child(2): 0.13s, ...)"

Right -- a bare CSS duration value only:

"stagger_delay": "0.09s"

The server parses this as a float and generates nth-child rules automatically. Anything other than a pattern matching ^\d+(\.\d+)?(s|ms)$ will crash the validator. Valid examples: "0.1s", "100ms", "0.09s".

Pitfall 4: Chart containers need explicit height

Wrong -- flex-based centering without explicit height:

.chart-container { flex: 1; min-height: 0; display: flex;
                   align-items: center; justify-content: center; }

Right -- explicit height, no flex centering:

.chart-container { width: 100%; height: min(60vh, 500px); position: relative; }

eCharts needs an explicit pixel/viewport height to render its canvas. Flex centering conflicts with the canvas positioning.

Pitfall 5: Table overflow must be hidden

Wrong -- auto overflow causes scrollbars inside slides:

.tbl-wrap { overflow-y: auto; overflow-x: auto; }

Right -- hidden overflow, size tables to fit:

.tbl-wrap { overflow: hidden; }

Tables should be sized to fit the slide. If a table does not fit, reduce rows or split across slides. Never scroll.

Pitfall 6: brand_tokens_css must define ALL referenced CSS variables

Every CSS variable used anywhere in any css_block must be defined in shared_css.brand_tokens_css. If a slide type css_block references var(--font-body), var(--bg-gradient), or var(--text-primary), and those variables are not in brand_tokens_css, the styling breaks silently -- CSS treats undefined variables as empty strings.

Checklist: After writing the config, search all css_block values, reset_and_base, utility_classes_css, and responsive_overrides_css for var(-- references. Every variable name found must appear in brand_tokens_css.

Pitfall 7: controller_js can be null

If javascript.controller_js is null, the server uses a built-in default navigation controller. This is fine and often preferred.

If you DO provide a custom controller_js, it must be a complete, self-contained script that handles:

• IntersectionObserver to add .visible class to slides
• Keyboard navigation (arrow keys, Space, Page Up/Down)
• Touch and wheel navigation
• Progress bar updates (if chrome.has_progress_bar is true)
• Nav dot updates (if chrome.has_nav_dots is true)

Pitfall 8: Logo SVG must use currentColor

Wrong -- hardcoded fill colors prevent color switching on different backgrounds:

<path d="M10 20..." fill="#6D22E0"/>

Right -- use currentColor so CSS controls the fill:

<path d="M10 20..." fill="currentColor"/>

Then define color variants in CSS:

.logo.on-light { color: #6D22E0; }
.logo.on-dark { color: rgba(255,255,255,0.9); }

Set uses_current_color: true in the logo config. If the SVG has multiple colors that cannot be simplified to currentColor, set uses_current_color: false and skip color_variants.

Pitfall 9: Table CSS must use colors visible on the table's background

The server resolves data-table-block containers by injecting <table> elements with the brand's table_css_class. The table CSS must use colors that are readable against the background where tables actually render — NOT the global theme colors.

Wrong — dark-theme brand using global color tokens for tables that render on a white panel:

.dtbl th { color: var(--text-muted); }    /* --text-muted is rgba(255,255,255,0.6) → invisible on white */
.dtbl td { color: var(--text-primary); }  /* --text-primary is #ffffff → invisible on white */

Right — use colors appropriate for the table's actual background context:

.dtbl th { color: #6B7280; }                   /* gray, readable on white */
.dtbl td { color: var(--bg-deep); }            /* dark brand color, readable on white */
.dtbl td { border-bottom: 1px solid #E5E7EB; } /* light gray border on white */

Rule: If your brand is dark-themed (global --text-primary is white/light) but tables appear on light panels (e.g. inside .content-card on a white .split-light panel), the table CSS must use dark text colors — either hardcoded hex values or dark-side brand tokens like var(--bg-deep). Check where tables will actually be placed and style accordingly.

Pitfall 10: html_template must demonstrate proper class usage

The LLM sees the css_block in the slim config and SHOULD use the CSS classes defined there, but it tends to write inline styles instead. The html_template field on each slide type is the primary way to steer the LLM toward correct class usage.

Wrong -- template with no class examples:

<section class="slide slide-data"><div class="content">...</div></section>

Right -- template showing exact class names for tables, charts, metrics:

<section class="slide wslide" id="slide-N">
  <div class="topbar"><div class="logo on-white rv"><!-- logo --></div><span class="pg-num rv">03 / 07</span></div>
  <div class="s-hdr rv"><span class="sect-bar"></span><span class="s-title">Section Title</span></div>
  <div class="tbl-wrap rv">
    <table class="dtbl">
      <thead><tr><th>Name</th><th class="n">Value</th></tr></thead>
      <tbody><tr><td>Row</td><td class="n hi">42</td></tr></tbody>
    </table>
  </div>
</section>

---

BrandConfig Structure Reference

File wrapper

The JSON file that gets uploaded has this outer structure:

{
  "scope": "organization",
  "style_name": "my-brand",
  "payload": {
    "brand_name": "...",
    "brand_description": "...",
    ...all BrandConfig fields...
  }
}

scope is either "organization" (org-wide default) or "user" (user-specific override).

Top-level fields

Field	Type	Required	Description
brand_name	string	Yes	Display name of the brand
brand_description	string	Yes	1-2 sentence description of the visual style
colors	ColorPalette	Yes	Complete color system
typography	Typography	Yes	Font definitions and settings
logo	LogoConfig	Yes	SVG logo with color/size variants
slide_types	SlideTypeSystem	Yes	All slide archetypes
decorative_elements	list	No	Brand-specific visual motifs (waves, tiles, grids)
animations	AnimationConfig	Yes	Allowed animation patterns
footer	FooterConfig	Yes	Footer appearance
chrome	ChromeConfig	No	Navigation chrome (progress bar, nav dots, topbar)
shared_css	SharedCSS	No	CSS that applies across all slides
javascript	JavaScriptConfig	No	Navigation controller and counter animations
workflow	WorkflowConfig	No	Which workflow phases are enabled
default_chart_color_scheme	string	No	Named color scheme for eCharts
table_css_class	string	No	CSS class applied to server-resolved <table> elements (e.g. "dtbl", "data-table")
forbidden_patterns	list[string]	No	Rules the LLM must never violate

colors (ColorPalette)

{
  "tokens": [
    { "name": "brand-blue", "value": "#016FFF", "usage": "Primary brand color for headings and accents" },
    { "name": "text-primary", "value": "#1e1b4b", "usage": "Main body text color" },
    { "name": "bg-deep", "value": "#0A0F1C", "usage": "Dark slide backgrounds" }
  ],
  "gradients": [
    { "name": "brand", "css_value": "linear-gradient(135deg, #016FFF 0%, #7C3AED 100%)", "usage": "Cover slide background" }
  ],
  "gradient_direction_constraint": null
}

Each token becomes a CSS variable --<name> in brand_tokens_css. The usage field helps the LLM choose the right color for each context.

typography (Typography)

{
  "fonts": [
    { "role": "display", "family": "'Space Grotesk', sans-serif", "weights": [700, 800], "source": "google_fonts" },
    { "role": "body", "family": "'Inter', sans-serif", "weights": [400, 500, 600], "source": "google_fonts" },
    { "role": "mono", "family": "'JetBrains Mono', monospace", "weights": [400], "source": "google_fonts" }
  ],
  "import_html": "<link href=\"https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@700;800&family=Inter:wght@400;500;600&display=swap\" rel=\"stylesheet\">",
  "heading_letter_spacing": "-0.022em",
  "body_line_height": 1.62
}

• role: "display" (headings), "body" (paragraph text), "mono" (code/data)
• source: "google_fonts", "fontshare", or "system"
• import_html: the <link> tag for loading the fonts. Set to null for system fonts.

logo (LogoConfig)

{
  "primary_svg": "<svg width=\"80\" height=\"15\" viewBox=\"...\" fill=\"none\" xmlns=\"...\"><path d=\"...\" fill=\"currentColor\"/></svg>",
  "icon_only_svg": null,
  "uses_current_color": true,
  "color_variants": [
    { "on_background": "light", "css_color": "var(--brand-blue)", "css_class": "on-light" },
    { "on_background": "dark", "css_color": "rgba(255,255,255,0.9)", "css_class": "on-dark" }
  ],
  "size_variants": [
    { "context": "topbar", "css_width": "80px" },
    { "context": "cover", "css_width": "clamp(250px, 45vw, 550px)" },
    { "context": "closing", "css_width": "80px" }
  ],
  "placement_css": null
}

• primary_svg: full inline SVG markup, not a URL. Must use fill="currentColor" if uses_current_color is true (see Pitfall 8).
• color_variants: how the logo appears on light, dark, and gradient backgrounds. The css_class is used in HTML: <div class="logo on-light"><!-- logo --></div>.
• size_variants: width for each placement context (topbar, cover, closing, footer).

slide_types (SlideTypeSystem)

{
  "types": [
    {
      "name": "Cover",
      "css_class": "slide slide-cover",
      "background_kind": "gradient",
      "background_value": "var(--grad-brand)",
      "layout_description": "Full-bleed gradient background with centered logo and title",
      "when_to_use": "Always the first slide",
      "has_decorative_elements": false,
      "has_footer": false,
      "logo_placement": "center-top",
      "logo_variant": "on-dark",
      "css_block": ".slide-cover { background: var(--grad-brand); color: #fff; ... }",
      "html_template": "<section class=\"slide slide-cover\" id=\"slide-1\">..."
    }
  ],
  "first_slide_type": "slide slide-cover",
  "last_slide_type": "slide slide-closing"
}

Key rules:

• first_slide_type and last_slide_type must match the css_class of a type in the types array.
• Every type MUST have a non-null css_block (see Pitfall 2).
• background_kind: one of "solid_color", "gradient", "gradient_split", "white".
• html_template: example HTML that demonstrates proper class usage for the LLM (see Pitfall 9).

decorative_elements

[
  {
    "name": "Wave Footer",
    "description": "An SVG wave that sits at the bottom of white slides",
    "css_block": ".wave { position: absolute; bottom: 0; left: 0; width: 100%; ... }",
    "html_template": "<div class=\"wave\"><!-- wave --></div>",
    "variation_instructions": "Each wave must use a unique SVG gradient ID",
    "applies_to_slide_types": ["slide wslide"]
  }
]

• applies_to_slide_types: list of css_class values this element should appear on. Empty list means all slides.
• html_template: must include the marker the server replaces (e.g. <!-- wave -->).

animations (AnimationConfig)

{
  "presets": [
    { "name": "Reveal Up", "css_class": "rv", "css_block": ".rv { opacity: 0; transform: translateY(40px); ... }" },
    { "name": "Reveal Left", "css_class": "rv-l", "css_block": ".rv-l { opacity: 0; transform: translateX(-40px); ... }" }
  ],
  "stagger_delay": "0.09s",
  "forbidden_effects": ["bounce", "spin", "3D transforms", "parallax scroll", "background video"],
  "general_guidance": "All animations are reveal-on-scroll only, triggered by IntersectionObserver adding .visible class."
}

• stagger_delay: MUST be a bare CSS duration like "0.1s" or "100ms" (see Pitfall 3).
• css_block on each preset: the full CSS rule. The server injects this; the LLM only needs the class name.
• forbidden_effects: the LLM is told to never use these.

footer (FooterConfig)

{
  "kind": "svg_wave",
  "text_content": null,
  "css_block": ".wave { position: absolute; bottom: 0; ... }",
  "html_template": "<div class=\"wave\"><!-- wave --></div>",
  "variation_instructions": "Each wave needs a unique SVG gradient ID (wf1, wf2, wf3...)"
}

• kind: "text" (static text footer), "svg_wave" (decorative SVG wave), or "none".

chrome (ChromeConfig)

{
  "has_progress_bar": true,
  "progress_bar_css": ".progress-bar { ... }",
  "has_nav_dots": true,
  "nav_dots_css": ".nav-dots { ... }",
  "has_topbar": true,
  "topbar_css": ".topbar { ... }",
  "topbar_html": "<div class=\"topbar\">...</div>"
}

Boolean flags tell the server what chrome to inject. CSS/HTML fields define the styling. All are optional -- defaults are used if omitted.

shared_css (SharedCSS)

{
  "reset_and_base": "* { margin: 0; ... } html { scroll-snap-type: ... } body { font-family: ... } h1, h2, h3 { ... }",
  "brand_tokens_css": ":root { --brand-blue: #016FFF; --text-primary: #1e1b4b; ... }",
  "utility_classes_css": ".visually-hidden { ... }",
  "responsive_overrides_css": "@media (max-height: 700px) { ... }"
}

• reset_and_base: MUST include full typography setup (see Pitfall 1).
• brand_tokens_css: MUST define every CSS variable referenced anywhere in the config (see Pitfall 6).
• Both are injected server-side into the final HTML <style> block.

javascript (JavaScriptConfig)

{
  "controller_js": null,
  "has_counter_animation": true
}

• controller_js: set to null to use the built-in default controller (see Pitfall 7). If provided, must be a complete navigation controller script.
• has_counter_animation: if true, the server adds counter animation JS for KPI numbers.

workflow (WorkflowConfig)

{
  "include_style_discovery": false,
  "include_ppt_conversion": true,
  "include_pdf_generation": false,
  "include_inline_editing": true,
  "output_path_template": "/sessions/.../mnt/outputs/<client-name>-<topic>.html",
  "html_title_template": "<Client> -- <Topic> | BrandName",
  "content_discovery_questions": [
    "What is the title/subject of this report?",
    "What are the key metrics to feature?",
    "How many slides should this be?"
  ]
}

Controls which phases of the frontend-slides skill workflow are enabled for this brand.

forbidden_patterns

[
  "Never substitute fonts -- Brand Font only",
  "Never modify the brand color tokens",
  "Never allow scrolling within a slide",
  "Cover slide must always be first, Closing slide must always be last"
]

These are passed to the LLM as hard constraints during HTML generation.

---

Step-by-Step: Creating a New BrandConfig

Step 1: Gather brand assets

Collect from the client or brand guidelines:

• Logo as SVG (ideally with currentColor fills)
• Primary and secondary brand colors (hex values)
• Font choices (Google Fonts names, or system font families)
• Any gradient definitions
• Example presentations or style references

Step 2: Define color tokens

Create the color token list. At minimum you need:

• Primary brand color
• Text colors (primary, secondary, muted)
• Background colors (for light and dark slides)
• Spacing tokens (using clamp() for responsiveness)
• Border/accent colors

Write these as colors.tokens. Each token becomes a CSS variable --<name>.

Step 3: Define gradients

If the brand uses gradients, define them in colors.gradients. Include the full CSS gradient value with direction and color stops.

Step 4: Set up typography

Define fonts with roles (display, body, optionally mono). Generate the import_html link tag for Google Fonts or Fontshare. Set heading_letter_spacing and body_line_height.

Step 5: Prepare the logo

Paste the full SVG inline as primary_svg. Convert hardcoded fill colors to currentColor (see Pitfall 8). Define color_variants for light and dark backgrounds, and size_variants for each placement context.

Step 6: Design slide types

Plan 4-8 slide types. Typical set:

1. Cover -- gradient or hero background, first slide
2. Content -- white/light background, general content
3. Data/Table -- optimized for tables and metrics
4. Chart -- optimized for chart containers
5. Split -- two-column layout
6. Closing -- gradient background, last slide

For each type, write:

• css_block with all CSS rules (NEVER leave null -- see Pitfall 2)
• html_template showing proper class usage (see Pitfall 9)
• layout_description and when_to_use for the LLM

Step 7: Write shared_css

reset_and_base: Start from the template in Pitfall 1. Include the .slide base rule, prefers-reduced-motion media query, body font declaration, and heading rules.

brand_tokens_css: Define a :root { } block with EVERY CSS variable referenced in any css_block (see Pitfall 6). Map color tokens to --<name> variables, add font-family variables (--font-display, --font-body), font-size variables (--title-size, --h2-size, --body-size), spacing variables, and gradient variables.

utility_classes_css: Optional helper classes (e.g. .visually-hidden).

responsive_overrides_css: Media queries for max-height: 700px, 600px, 500px.

Step 8: Configure animations

Define 2-4 animation presets (typically reveal-up, reveal-left, reveal-right). Set stagger_delay to a simple duration like "0.1s" (see Pitfall 3). List forbidden_effects.

Step 9: Configure footer and chrome

Choose footer kind ("svg_wave", "text", or "none"). If using svg_wave, provide the css_block and html_template with the <!-- wave --> marker.

Set chrome boolean flags and provide CSS for progress bar, nav dots, and topbar if needed.

Step 10: Set chart and table container CSS

If any slide type includes charts, make sure the css_block includes:

.chart-container { width: 100%; height: min(60vh, 500px); position: relative; }

Never use flex centering for chart containers (see Pitfall 4).

If any slide type includes tables:

1. Set table_css_class at the top level (e.g. "dtbl" or "data-table")
2. Define CSS for that class in a slide type's css_block (e.g. .dtbl, .dtbl th, .dtbl td)
3. Use overflow: hidden on table wrappers (see Pitfall 5)
4. Critical: Make sure the table CSS uses colors that are visible against the background where tables render — NOT the global theme color tokens if they're designed for dark backgrounds (see Pitfall 9)

The server resolves <div class="table-container" data-table-block="BLOCK_NAME"> containers by looking up the table block in the source document and injecting a <table class="<table_css_class>"> element with the rendered data.

Step 11: Validate

Before uploading, verify:

• shared_css.reset_and_base includes body font, html scroll-snap, heading rules
• Every slide type has a non-null css_block
• stagger_delay matches the pattern ^\d+(\.\d+)?(s|ms)$
• Chart containers have explicit height, no flex centering
• Table wrappers use overflow: hidden
• If tables are supported, table_css_class is set and its CSS is defined in a slide type css_block
• Table CSS colors are visible against the background where tables actually render (see Pitfall 9)
• Every var(--...) reference in any CSS field is defined in brand_tokens_css
• Logo SVG uses fill="currentColor" (if uses_current_color is true)
• html_template fields demonstrate correct class usage for tables, charts, metrics
• first_slide_type and last_slide_type match a css_class in the types array

Step 12: Upload

Wrap the BrandConfig payload in the file wrapper:

{
  "scope": "organization",
  "style_name": "my-brand",
  "payload": { ... }
}

Upload via curl:

curl -sk -X POST \
  "https://localhost:5173/api/v1/admin/style/upload?clerk_id=CLERK_ID" \
  -H "Content-Type: application/json" \
  -d @path/to/config.json

Replace CLERK_ID with the Clerk user ID for the target organization. The endpoint upserts -- if a style with the same (org, style_name) already exists, it is updated.

---

Quick Reference: Mandatory Minimums

A valid BrandConfig must have at least:

1. brand_name and brand_description
2. At least one color token in colors.tokens
3. At least one font in typography.fonts (role "body")
4. A logo.primary_svg with inline SVG
5. At least two slide types: one matching first_slide_type, one matching last_slide_type
6. Every slide type with a non-null css_block
7. At least one animation preset in animations.presets
8. footer.kind set to one of "text", "svg_wave", "none"
9. shared_css.reset_and_base with full typography setup
10. shared_css.brand_tokens_css defining all referenced CSS variables