Im sheets style guide

Integral Media — Google Sheets Style Guide

Brand-faithful formatting for Google Sheets, derived from the IM HTML style guide (integralmedia1/im-html-style-guide). Adapted for Sheets constraints: limited fonts, no border-radius/shadows/text-transform. All colour combinations pass WCAG AA (4.5:1+ for normal text).

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Colour Palette

Token	Hex	RGB (0-1)	WCAG Notes	Usage
navy	#002F6C	0.0, 0.184, 0.424	17.5:1 vs white	Document title row bg, summary tab colour
navy-light	#0A3D7A	0.039, 0.239, 0.478	14.4:1 vs white	Section divider row bg
sky	#27C1F4	0.153, 0.757, 0.957	Accent only	Tab colours (data tabs), accent borders
sky-muted	#E6F7FE	0.902, 0.969, 0.996	6.3:1 vs slate-dark	Notes/data source bg, LOW priority bg
charcoal	#333740	0.200, 0.216, 0.251	14.8:1 vs white	All body text
cool-grey	#DCDDEB	0.863, 0.867, 0.922	—	All borders, horizontal rules
light	#F1F5F9	0.945, 0.961, 0.976	14.0:1 vs charcoal	Column header bg, alternating row band
lighter	#F8FAFC	0.973, 0.980, 0.988	16.7:1 vs navy	Sub-header bg
slate-dark	#475569	0.278, 0.333, 0.412	6.3:1 vs sky-muted	Secondary text (notes, footnotes)
white	#FFFFFF	1.0, 1.0, 1.0	—	Primary row bg, text on dark bg
subtitle-grey	#CCCCCC	0.8, 0.8, 0.8	10.8:1 vs navy	Subtitle text on navy bg
red-muted	#FEE2E2	0.996, 0.886, 0.886	12.4:1 vs charcoal	HIGH priority bg
amber-muted	#FEF3C7	0.996, 0.953, 0.780	13.8:1 vs charcoal	MEDIUM priority bg
amber	#F59E0B	0.961, 0.620, 0.043	—	Warning row left border accent
green-muted	#DCFCE7	0.863, 0.988, 0.906	14.2:1 vs charcoal	VERIFIED / complete bg

Accessibility Notes

• slate (#64748B) replaced with slate-dark (#475569) for all secondary text — original was borderline 4.5:1 on sky-muted, new value gives 6.3:1 headroom
• Minimum font size: 10pt everywhere (no 9pt)
• Separator rows: 20px minimum (invisible rows break keyboard nav + screen readers)
• Priority/warning rows use colour + text label + left border accent (not colour-only)

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Element Specifications

Element	Background	Text Colour	Font	Size	Bold	Height	Merge	Borders
Document title	navy	white	Roboto	14pt	Yes	40px	Full width	Bottom: 3px sky accent
Subtitle rows	navy	subtitle-grey	Roboto	10pt	No	22px	Full width	None
Section divider	navy-light	white	Roboto	11pt	Yes	30px	Full width	None
Column header	light	charcoal	Roboto	10pt	Yes	28px	No	Bottom: 1px cool-grey
Sub-header	lighter	navy	Roboto	10pt	Yes	26px	Full width	Bottom: 1px cool-grey
Data cell (single-line)	white	charcoal	Roboto	10pt	No	24px	No	Bottom: 1px cool-grey
Data cell (wrapped)	white	charcoal	Roboto	10pt	No	42px	No	Bottom: 1px cool-grey
Alt data cell (single-line)	light	charcoal	Roboto	10pt	No	24px	No	Bottom: 1px cool-grey
Alt data cell (wrapped)	light	charcoal	Roboto	10pt	No	42px	No	Bottom: 1px cool-grey
Data source note	sky-muted	slate-dark	Roboto	10pt	Italic	24px	Full width	None
Separator row	white	—	—	—	—	20px	—	None
HIGH priority	red-muted	charcoal	Roboto	10pt	Yes	24px	No	Left: 3px red
MEDIUM priority	amber-muted	charcoal	Roboto	10pt	Yes	24px	No	Left: 3px amber
LOW priority	sky-muted	charcoal	Roboto	10pt	Yes	24px	No	Left: 3px sky
Warning row	amber-muted	charcoal	Roboto	10pt	Yes	24px	No	Left: 3px amber

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Design Decisions

• Font: Roboto everywhere (closest to Inter in Sheets). Roboto Mono for email addresses and IDs.
• Hierarchy: Navy title → navy-light sections → light headers → white/light data rows (4 levels)
• Borders: Horizontal rules only — 1px cool-grey bottom border on every data row. No full grid.
• Sky accent: Used sparingly — tab colours + title bottom accent border only. Never as cell bg.
• Separator rows: 20px empty rows for breathing space, accessible for keyboard nav.
• Text wrapping: Default to WRAP on all content columns. Only use CLIP/OVERFLOW on explicitly short-value columns (single status words, yes/no, single IDs under 15 chars). When in doubt, WRAP.
• Frozen rows: Row 1 on data tabs, none on Summary/report tabs.
• Alignment: Left-align all text columns. Never centre-align text columns.
• Tab colours: Summary = navy (#002F6C), data tabs = sky (#27C1F4).

Column Width Guidelines

Content Type	Width (px)
Dates	140
Email addresses	250
IDs / short codes	110-140
Names / labels	220-280
Status / role	120-140
Notes / descriptions	300-400
URLs	320-400

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Anti-Patterns (Do Not)

• Full grid borders (overwhelming)
• Bright saturated cell backgrounds (unprofessional, accessibility issues)
• Multiple font families (visual noise)
• Centre-aligned text columns (harder to scan)
• Font sizes below 10pt (readability on laptop screens)
• Invisible separator rows (<20px)
• Colour-only status indicators (accessibility failure)
• Relying on sheet default for white backgrounds (residual formatting bleeds through from previous sessions)
• Formatting only the data range without clearing surrounding columns/rows (old banding/formatting artifacts remain visible)

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White-Label Adaptation

Same formatting rules apply for white-label partner clients — just remove all IM references from content. No brand modifications needed to the formatting itself.

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API Reference

When building batchUpdate requests, use the RGB (0-1) values from the colour palette. Google Sheets API expects { red: 0.0, green: 0.184, blue: 0.424 } format.

Implementation Rules

• Explicit white backgrounds: Always set explicit white backgrounds on ALL data rows. Never rely on the sheet default — previous formatting sessions may have left residual cell-level backgrounds that override the sheet default.
• Clear beyond data range: After formatting the data range, clear all backgrounds from endColumn to column Z and from endRow to row 100+. Old banded ranges and formatting often extend beyond the visible data area.
• Default wrap strategy: Set wrapStrategy: "WRAP" on all content columns. Only use CLIP/OVERFLOW on columns with short single-value content (yes/no, single IDs under 15 chars).

API Gotchas

• Unmerge before merge: Always send unmergeCells on the full sheet range before applying any new mergeCells requests. Otherwise you'll get "You must select all cells in a merged range to merge or unmerge them" errors from cells merged in previous sessions.
• Banding conflicts: addBanding fails if any banded range already overlaps the target range. The correct delete method is deleteBanding (not deleteBandedRange). Query existing banded ranges first and delete ALL of them, not just known IDs.

Typical Request Order per Tab

0. unmergeCells — clear all existing merges on the full sheet range
1. deleteBanding — query and remove ALL existing banded ranges
2. updateSheetProperties — tab colour, frozen rows
3. mergeCells — section dividers, title rows, note rows
4. updateDimensionProperties — column widths + row heights
5. repeatCell — backgrounds, text formatting, fonts, alignment, wrap
6. updateBorders — horizontal rules, accent borders
7. addBanding — alternating rows on data sections with 8+ rows
8. Clear formatting beyond data range — explicit white bg on surrounding empty cells