All three are open fonts and ship with Parch tooling. Persian text falls back
to Estedad automatically in mixed-direction strings because the font stack is
ordered Saira → Estedad → system.
Scale
Style
Size / weight
Usage
Display
36–40px · bold
Landing heroes only
Title 1
34px · semibold
Page titles
Title 2
24px · semibold
Section headings
Title 3
19px · semibold
Subsections, card titles
Body
16px · regular · 1.75
Reading text
Body small
14px
Descriptions, captions
Label
12–13px · medium
Field labels, chips
Mono
13.7px
Code, commands, identifiers
Rules
Line length: 60–80 characters for reading text, the portal's article
column is capped for this reason.
Headings are sentence case in English and normal case in Persian; no
all-caps headings except small uppercase group labels (used sparingly).
Weight carries hierarchy; size carries it further. Never use color alone
to distinguish headings from body.
Numbers in data-dense UIs use tabular figures where the toolkit supports
them (font-variant-numeric: tabular-nums).
Persian typography
Use Estedad at the same nominal sizes with ~1.05× line-height; Arabic-script
letterforms are taller.
Persian numerals (۱۲۳) are preferred in Persian UI strings; keep Latin
numerals in code, versions, and package names.
Do not letter-space Persian text; it breaks letter joining.
Mixed-direction text (Persian + package names) uses Unicode bidi isolation
so package names stay LTR inside RTL sentences.
