layout fix

README.md

@@ -186,6 +186,30 @@ Note: direct commands like `\paperwidth{...}` or `\color{...}` would clash with
 - `bgscale=`: background image scale, default `1.0`
 - `bgopacity=`: background image opacity, default `1.0`
 
+Standard Layout Blueprint (Normalfall)
+======================================
+
+The diagram below shows the default `layout=standard` with `header=true` and `qr=true`
+(`qrfirst` variant: QR on the left, text on the right):
+
+![Standard layout blueprint](screenshots/layout-standard.svg)
+
+What Influences What (Standard Layout)
+--------------------------------------
+
+- `paperwidth/paperheight/contentwidth/contentheight/padding`: define the outer geometry of the whole card.
+- `header/noheader`: enables/disables the complete top block (name/logo/company line + separator line).
+- `logo` + `logoheight`: affects header composition and reserved vertical space.
+- `company[height=...]` / `companylogo[height=...]`: affects second header line and reserved space.
+- `textwidth` and `qrwidth`: define horizontal split of body columns.
+- `qr/noqr`: removes the QR column; text then uses full body width.
+- `qrfirst/textfirst`: swaps left/right order of QR and text columns.
+- `icon/noicon`, `hint/nohint`, `iconleft/iconright`, `fill/nofill`: only affect formatting inside text lines.
+- address field presence/visibility: controls whether address block (and map-pin icon) is rendered.
+- `pgpfingerprint`: adds an extra footer line and reserves additional vertical space.
+- `background`/`bgscale`/`bgopacity`: visual background only, no content reflow.
+- `qrlogo`/`qreclevel`/`qrlogoscale`/`qrlogoborder`: QR internals only, no column reflow.
+
 
 Data Definitions
 ================
@@ -323,6 +347,8 @@ Alternative: centered back side without QR and without header:
 \drawcard[layout=centered,noqr,noheader]
 ```
 
+Complete working example: [centered-backside-example.tex](examples/centered-backside-example.tex)
+
 Equivalent using setter commands:
 
 ```latex