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# Guide Style System — Authoring & Build Specification
This document is a **complete, self-contained specification** for producing a polished, book-style guide as a single HTML file that renders to a clean A4 PDF. It is **topic-neutral**: use it for programming subjects (PHP, Godot, Blender) and equally for non-technical ones (nutrition, finance, psychology, communication, language learning, …).
You will normally be given two things: this specification and possibly one reference HTML file built with it. From those alone you must be able to:
1. Gather the subject knowledge yourself (research as needed).
2. Decide a structure (parts → chapters).
3. Write a single HTML file that embeds the CSS from this document verbatim.
4. Convert that HTML to PDF.
Follow this spec exactly. The visual identity depends on small details (spacing, weights, the single accent color), so do not improvise the CSS. You **do** have full freedom over content, structure, length, and which optional building blocks you use.
---
## 1. Output contract
- **One HTML file**, self-contained: a single `<style>` block in `<head>`, no external CSS, no external JS, no web fonts. Fonts are system fonts only (see §3).
- The HTML converts to PDF with **WeasyPrint**. The canonical build command is:
```
weasyprint guide.html guide.pdf
```
- Page size is **A4**. All page furniture (page numbers, running header, footer label) is produced by CSS `@page` rules — you never write headers/footers into the body.
- The body is laid out as: **Cover → Table of Contents → Part 1 divider → its chapters → Part 2 divider → its chapters → …**
If WeasyPrint is unavailable, the HTML must still be a valid, good-looking standalone document; the layout is built so it degrades gracefully in a browser too.
---
## 2. Mental model of a guide
A guide is a short book. The structure is always the same three levels:
- **Part** — a major thematic section (e.g. "Fundamentals", "Advanced", "Pitfalls"). Each part gets a full-page **divider**. A guide typically has **38 parts**.
- **Chapter** — one focused topic. Chapters flow continuously down the page (they do not force a page break); each is separated from the previous by spacing and its own heading block. **310 chapters per part**. Each chapter is numbered sequentially across the whole guide (Chapter 1, 2, 3 … regardless of part).
- **Section** (`<h2>`) and **sub-section** (`<h3>`) — structure inside a chapter.
### Scope — coverage-driven (top tier)
**1030 pages, covering all important building blocks of the topic** — everything a practical user needs in real work. Far broader than the MiniGuide tier ("core building blocks only"). How much that is depends on the topic.
A **topic inventory** is produced beforehand by a research agent and supplied to you. It is binding: every inventory item must appear in the guide as its own section — do not merge, trim, or drop items. Derive parts and chapters from the inventory; part/chapter counts follow from it, there is no default number. Page count is an outcome within the 1030 range, never a target. State the resulting scope on the cover (parts · chapters).
### Voice and content rules (apply to every topic)
- Write in the **reader's language** (German request → German guide). This spec is in English, but that does not constrain the output language.
- Open each chapter with a one- or two-sentence **lead** (`.lead`) that frames why the topic matters.
- Explain each new term the first time it appears. Assume an intelligent reader who is new to *this* subject.
- Prefer **short, concrete examples** over abstract description. For technical topics that means small code snippets; for non-technical topics it means worked examples, sample dialogues, before/after comparisons, small tables, checklists, or step lists.
- **Explanations are short and simple**: max. 3 short main clauses per concept, no nested sentences. Plain language over precision-flexing.
- Use **callouts** to highlight tips, warnings, side-notes, and deeper digressions — not more than one or two per chapter. Sentences like "Empfehlung: …", "In der Praxis problematisch: …", "Achtung: …" ALWAYS go into the matching callout (tip/warn/note), never into running explanation text.
- Keep prose tight. This is a reference people skim and return to, not an essay.
---
## 3. The CSS — embed this verbatim
Paste the following into a single `<style>` element in `<head>`. **Do not rename classes, change spacing units, or restructure rules.** The only thing you customize is the small block of CSS variables in `:root` (see §4).
```css
/* ============================================================
GUIDE STYLE SYSTEM · Stylesheet (WeasyPrint)
============================================================ */
/* ---------- PAGE ---------- */
@page {
size: A4;
margin: 20mm 18mm 18mm 18mm;
@bottom-center {
content: counter(page);
font-family: -apple-system, "Segoe UI", sans-serif;
font-size: 8pt;
color: #888;
}
@bottom-right {
content: var(--footer-label); /* set in :root, see §4 */
font-family: -apple-system, "Segoe UI", sans-serif;
font-size: 8pt;
color: #888;
}
@top-right {
content: string(chaptertitle);
font-family: -apple-system, "Segoe UI", sans-serif;
font-size: 8pt;
color: #aaa;
}
}
/* Cover page: no header/footer */
@page cover {
margin: 0;
@bottom-center { content: none; }
@bottom-right { content: none; }
@top-right { content: none; }
}
/* Part-divider pages: no running header (the title is already prominent) */
@page chapterstart {
@top-right { content: none; }
}
* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
/* ===== CUSTOMIZE PER TOPIC — see §4 ===== */
--accent: #777BB4; /* main accent */
--accent-dark: #4F5B93; /* darker shade for headings */
--accent-darker: #2C3E66; /* darkest, for cover gradient + part titles */
--footer-label: "Guide"; /* short title shown bottom-right of every page */
/* ===== USUALLY LEAVE THESE ALONE ===== */
--ink: #1a1a1a;
--muted: #5a6470;
--line: #d8dde3;
--bg-soft: #f5f5fb; /* tint this toward your accent if you like */
--code-bg: #1e2a3a;
--code-fg: #e6e6e6;
--plus: #2c8a3e; /* tip / positive */
--minus: #c0392b; /* warning / negative */
--neutral: #b8860b; /* deep-dive / aside */
}
html, body {
font-family: Charter, "Source Serif Pro", Georgia, serif;
color: var(--ink);
font-size: 10.5pt;
line-height: 1.55;
}
/* ============================================================
COVER
============================================================ */
.cover {
page: cover;
page-break-after: always;
height: 297mm;
background: linear-gradient(150deg, var(--accent-darker) 0%, var(--accent-dark) 45%, var(--accent) 100%);
color: white;
position: relative;
display: flex;
flex-direction: column;
justify-content: center;
padding: 0 22mm;
}
.cover-logo {
width: 30mm; height: 30mm;
background: rgba(255,255,255,0.14);
border: 1.5pt solid rgba(255,255,255,0.5);
border-radius: 7mm;
display: flex; align-items: center; justify-content: center;
font-family: -apple-system, sans-serif;
font-size: 20pt; font-weight: 800;
margin-bottom: 14mm;
letter-spacing: -1pt;
}
.cover h1 {
font-family: -apple-system, sans-serif;
font-size: 42pt;
font-weight: 800;
line-height: 1.02;
letter-spacing: -1.5pt;
margin-bottom: 6mm;
}
.cover h1 .light { font-weight: 300; display:block; font-size: 30pt; opacity: 0.85; }
.cover .sub {
font-family: -apple-system, sans-serif;
font-size: 13pt;
font-weight: 400;
opacity: 0.9;
line-height: 1.5;
max-width: 130mm;
margin-bottom: 18mm;
}
.cover .meta-row {
font-family: -apple-system, sans-serif;
font-size: 9.5pt;
opacity: 0.85;
border-top: 1pt solid rgba(255,255,255,0.3);
padding-top: 5mm;
display: flex;
gap: 8mm;
}
.cover .meta-row b { font-weight: 700; }
.cover-deco {
position: absolute;
font-family: "SF Mono", Consolas, monospace;
font-size: 120pt;
font-weight: 800;
opacity: 0.06;
bottom: 10mm;
right: 12mm;
line-height: 1;
}
/* ============================================================
TABLE OF CONTENTS
============================================================ */
.toc {
page-break-after: always;
}
.toc h2 {
font-family: -apple-system, sans-serif;
font-size: 22pt;
font-weight: 800;
color: var(--accent-dark);
margin-bottom: 8mm;
border: none;
}
.toc-part {
font-family: -apple-system, sans-serif;
font-size: 10pt;
font-weight: 800;
text-transform: uppercase;
letter-spacing: 1.5pt;
color: var(--accent);
margin: 6mm 0 2mm 0;
padding-bottom: 1mm;
border-bottom: 1pt solid var(--line);
}
.toc-part:first-of-type { margin-top: 0; }
.toc-entry {
display: flex;
font-family: -apple-system, sans-serif;
font-size: 9.5pt;
margin: 1.6mm 0;
align-items: baseline;
}
.toc-num {
color: var(--accent-dark);
font-weight: 700;
width: 11mm;
flex-shrink: 0;
}
.toc-title { color: var(--ink); }
.toc-dots {
flex: 1;
border-bottom: 1pt dotted var(--line);
margin: 0 2mm;
transform: translateY(-1mm);
}
.toc-page { color: var(--muted); font-variant-numeric: tabular-nums; }
/* ============================================================
PART DIVIDER
============================================================ */
.part-divider {
page: chapterstart;
page-break-before: always;
page-break-after: always;
height: 257mm;
display: flex;
flex-direction: column;
justify-content: center;
background: var(--bg-soft);
border-radius: 4mm;
padding: 0 20mm;
}
.part-divider .part-kicker {
font-family: -apple-system, sans-serif;
font-size: 11pt;
font-weight: 700;
text-transform: uppercase;
letter-spacing: 3pt;
color: var(--accent);
margin-bottom: 4mm;
}
.part-divider h1 {
font-family: -apple-system, sans-serif;
font-size: 34pt;
font-weight: 800;
color: var(--accent-darker);
letter-spacing: -1pt;
line-height: 1.05;
margin-bottom: 6mm;
}
.part-divider .part-desc {
font-size: 12pt;
color: var(--muted);
font-style: italic;
max-width: 120mm;
}
.part-divider .part-chapters {
margin-top: 10mm;
font-family: -apple-system, sans-serif;
font-size: 9.5pt;
color: var(--accent-dark);
}
.part-divider .part-chapters span {
display: block;
margin: 1.5mm 0;
padding-left: 5mm;
border-left: 2pt solid var(--accent);
}
/* ============================================================
CHAPTER
============================================================ */
.chapter {
margin-top: 8mm; /* chapters flow continuously; no forced page break */
}
.chapter-head {
string-set: chaptertitle content();
margin-bottom: 6mm;
padding-bottom: 3mm;
border-bottom: 2pt solid var(--ink);
}
.chapter-num {
font-family: -apple-system, sans-serif;
font-size: 9pt;
font-weight: 700;
text-transform: uppercase;
letter-spacing: 2pt;
color: var(--accent);
display: block;
margin-bottom: 1.5mm;
}
.chapter-head h1 {
font-family: -apple-system, sans-serif;
font-size: 24pt;
font-weight: 800;
color: var(--accent-dark);
letter-spacing: -0.5pt;
line-height: 1.1;
}
/* ============================================================
IN-FLOW HEADINGS
============================================================ */
h2 {
font-family: -apple-system, sans-serif;
font-size: 14pt;
font-weight: 700;
color: var(--accent-dark);
margin: 6mm 0 2.5mm 0;
page-break-after: avoid;
}
h3 {
font-family: -apple-system, sans-serif;
font-size: 11pt;
font-weight: 700;
color: var(--ink);
margin: 4mm 0 1.5mm 0;
page-break-after: avoid;
}
p {
margin-bottom: 2.5mm;
text-align: justify;
hyphens: auto;
}
p b, li b { color: var(--accent-dark); }
ul, ol { margin: 1.5mm 0 3mm 6mm; }
li { margin-bottom: 1mm; }
/* ============================================================
CODE (optional — technical topics only, see §7)
============================================================ */
pre {
background: var(--code-bg);
color: var(--code-fg);
font-family: "SF Mono", Consolas, monospace;
font-size: 8.3pt;
line-height: 1.5;
padding: 3mm 4mm;
border-radius: 2mm;
margin: 2.5mm 0 3.5mm 0;
white-space: pre;
overflow: hidden;
page-break-inside: avoid;
}
.c { color: #6b8aae; font-style: italic; } /* comment / de-emphasized */
.k { color: #ff79c6; } /* keyword / control word */
.s { color: #f1c40f; } /* string / number / literal value */
.f { color: #50fa7b; } /* function / callable name */
.t { color: #8be9fd; } /* type / tag / class name */
.v { color: #ffb86c; } /* variable / identifier */
.a { color: #bd93f9; } /* attribute / annotation / decorator */
code.inline {
font-family: "SF Mono", Consolas, monospace;
font-size: 9pt;
background: var(--bg-soft);
padding: 0.3mm 1.5mm;
border-radius: 1mm;
color: var(--accent-dark);
}
/* ============================================================
CALLOUTS
============================================================ */
.callout {
border-radius: 2mm;
padding: 2.5mm 4mm;
margin: 3mm 0;
font-size: 10pt;
page-break-inside: avoid;
display: grid;
grid-template-columns: 6mm 1fr;
gap: 3mm;
}
.callout-icon {
font-family: -apple-system, sans-serif;
font-weight: 800;
font-size: 14pt;
line-height: 1;
text-align: center;
}
.callout-body > b:first-child {
font-family: -apple-system, sans-serif;
text-transform: uppercase;
font-size: 8pt;
letter-spacing: 1pt;
display: block;
margin-bottom: 1mm;
}
.callout.tip { background: #e8f4ea; border-left: 3pt solid var(--plus); }
.callout.tip .callout-icon, .callout.tip .callout-body > b:first-child { color: var(--plus); }
.callout.warn { background: #fdecea; border-left: 3pt solid var(--minus); }
.callout.warn .callout-icon, .callout.warn .callout-body > b:first-child { color: var(--minus); }
.callout.note { background: var(--bg-soft); border-left: 3pt solid var(--accent); }
.callout.note .callout-icon, .callout.note .callout-body > b:first-child { color: var(--accent-dark); }
.callout.deep { background: #fff8e8; border-left: 3pt solid var(--neutral); }
.callout.deep .callout-icon, .callout.deep .callout-body > b:first-child { color: var(--neutral); }
/* ============================================================
TABLES
============================================================ */
table {
border-collapse: collapse;
width: 100%;
margin: 2.5mm 0 3.5mm 0;
font-family: -apple-system, sans-serif;
font-size: 9pt;
page-break-inside: avoid;
}
th {
background: var(--accent-dark);
color: white;
text-align: left;
padding: 1.8mm 3mm;
font-weight: 700;
}
td {
padding: 1.5mm 3mm;
border-bottom: 1pt solid var(--line);
vertical-align: top;
}
tr:nth-child(even) td { background: var(--bg-soft); }
td code, th code {
font-family: "SF Mono", Consolas, monospace;
font-size: 8.2pt;
}
/* small helpers */
.lead {
font-size: 11.5pt;
color: var(--muted);
font-style: italic;
margin-bottom: 4mm;
}
```
---
## 4. The only things you customize: `:root` variables
Change **four** values per guide; leave the rest unless you have a reason. The accent color is the entire brand: pick one that fits the topic, then derive a darker and darkest shade from it (roughly: accent at ~55% lightness, accent-dark ~40%, accent-darker ~28%, all at similar hue).
| Variable | What it is | Example (PHP) |
|---|---|---|
| `--accent` | main accent (kickers, links, code-inline, table tint sources) | `#777BB4` |
| `--accent-dark` | headings, table header background | `#4F5B93` |
| `--accent-darker` | cover gradient end + part titles | `#2C3E66` |
| `--footer-label` | short title shown bottom-right every page; **must be a quoted CSS string** | `"PHP Komplett-Guide"` |
### Recommended accent palettes (free to ignore or replace)
These are starting points — three shades each (accent / dark / darker):
- **Programming / PHP** — `#777BB4` / `#4F5B93` / `#2C3E66` (violet)
- **Godot / game dev** — `#478CBF` / `#3A6E97` / `#27496B` (blue)
- **Blender / 3D / art** — `#E87D0D` / `#C2670A` / `#8A4906` (orange)
- **Finance / business** — `#1F7A4D` / `#155C39` / `#0D3D26` (green)
- **Nutrition / health** — `#D2603A` / `#A8492B` / `#74331E` (terracotta)
- **Psychology / communication** — `#6A5ACD` / `#52459E` / `#372E6B` (indigo)
- **Language learning** — `#C0392B` / `#992D22` / `#641E16` (warm red)
- **Neutral / mixed topics** — `#3D5A73` / `#2E4557` / `#1E2E3B` (slate)
When you change the accent, optionally nudge `--bg-soft` toward the same hue (keep it very light, ~96% lightness) so tinted blocks feel cohesive. Everything else (`--ink`, `--muted`, `--line`, callout colors, code colors) stays fixed — those are deliberately topic-independent.
---
## 5. HTML skeleton
The body is a flat sequence of sections. There is no wrapper around chapters; the CSS handles page breaks. Order: cover, TOC, then for each part its divider immediately followed by its chapters.
```html
<!DOCTYPE html>
<html lang="de"> <!-- set to the guide's language -->
<head>
<meta charset="utf-8">
<title>… Guide title …</title>
<style>
/* paste the entire stylesheet from §3 here */
</style>
</head>
<body>
<!-- COVER -->
<section class="cover"> … </section>
<!-- TABLE OF CONTENTS -->
<section class="toc"> … </section>
<!-- PART 1 -->
<section class="part-divider"> … </section>
<section class="chapter"> … </section>
<section class="chapter"> … </section>
<!-- … more chapters … -->
<!-- PART 2 -->
<section class="part-divider"> … </section>
<section class="chapter"> … </section>
<!-- … etc … -->
</body>
</html>
```
You may generate this HTML however you like — by hand, or with a small script that concatenates strings. A script helps for long guides because it keeps each chapter in its own readable chunk. If you use a script, **the script is throwaway**; the deliverable is the HTML (and the PDF), not the script.
---
## 6. The building blocks
Below is the exact markup for every block. Copy these shapes; fill in content.
### 6.1 Cover
```html
<section class="cover">
<div class="cover-logo">LOGO</div>
<h1>MAIN TITLE<span class="light">Subtitle line</span></h1>
<div class="sub">One or two sentences describing what the guide covers and who it is for.</div>
<div class="meta-row">
<span><b>N Parts</b> · M Chapters</span>
<span><b>Edition / version</b> · Year</span>
<span>Focus: …</span>
</div>
<div class="cover-deco">◆</div>
</section>
```
- **`.cover-logo`** — 14 characters or a single symbol that evokes the topic. Examples: `php`, `gd` (Godot), a Blender-style `b`, `` (finance), `Ψ` (psychology), `EN` (English), `🍎` is **not** allowed (no emoji in the logo — keep it crisp). Prefer short letterforms or a geometric glyph (`◆ ● ▲ ■`).
- **`.cover h1`** — the big title. The `<span class="light">` is an optional lighter, smaller second line (e.g. `PHP` then `The Complete Guide`). Drop the span for a single-line title.
- **`.cover-deco`** — a giant, very faint background glyph in the bottom-right. Pick something topic-flavored: a code fragment (`<?php`, `{ }`, `def`), a symbol (``, ``, `Ψ`, ``), or a single bold letter. Keep it to a few characters; it is decorative and barely visible by design.
- **`.meta-row`** — two to four short facts separated into `<span>`s. Use it to state scope (parts/chapters), edition/year, and the focus. This is where you set the reader's expectations about length and depth.
### 6.2 Table of contents
List every part, and under it every chapter, numbered sequentially across the whole guide. There are **no real page numbers** (WeasyPrint does not back-fill them here), so the `.toc-page` element is optional — omit it, or use it only if you maintain numbers yourself. The dotted leader still looks right without a trailing number.
```html
<section class="toc">
<h2>Contents</h2>
<div class="toc-part">Part 1 · Fundamentals</div>
<div class="toc-entry">
<span class="toc-num">1</span>
<span class="toc-title">First chapter title</span>
<span class="toc-dots"></span>
</div>
<div class="toc-entry">
<span class="toc-num">2</span>
<span class="toc-title">Second chapter title</span>
<span class="toc-dots"></span>
</div>
<div class="toc-part">Part 2 · Going Deeper</div>
<div class="toc-entry">
<span class="toc-num">3</span>
<span class="toc-title">…</span>
<span class="toc-dots"></span>
</div>
</section>
```
### 6.3 Part divider
One full page that introduces a part. The chapter list mirrors the TOC entries for that part.
```html
<section class="part-divider">
<div class="part-kicker">Part 1</div>
<h1>Fundamentals</h1>
<div class="part-desc">Italic one-liner describing the arc of this part.</div>
<div class="part-chapters">
<span>1 · First chapter</span>
<span>2 · Second chapter</span>
<span>3 · Third chapter</span>
</div>
</section>
```
### 6.4 Chapter
The `.chapter-head` is special: its text is captured into the **running header** at the top-right of every page in that chapter (via `string-set: chaptertitle content()`). Note that `content()` concatenates the text of **all** children, so the chapter-number span and the title run together in the header (e.g. "Chapter 1Title"). For a clean separator, end the `.chapter-num` text with a trailing separator such as `Chapter 1 · ` (trailing space + middot) — or accept the run-on; both are acceptable. Either way keep the chapter `<h1>` reasonably short so it fits on one header line.
```html
<section class="chapter">
<div class="chapter-head">
<span class="chapter-num">Chapter 1</span>
<h1>Chapter title</h1>
</div>
<p class="lead">Framing sentence(s) — why this matters.</p>
<h2>A section</h2>
<p>Body text. Use <b>bold</b> for the key term in a sentence. Inline monospace
like <code class="inline">term</code> works for any short literal —
a command, a key name, a nutrient, a chord, a German case.</p>
<h3>A sub-section</h3>
<p>…</p>
<!-- tables, callouts, code, lists as needed -->
</section>
```
### 6.5 Callouts
Four flavors. Each has a short uppercase label as the **first `<b>`** inside `.callout-body`, then body text. The icon column holds one glyph.
```html
<div class="callout tip">
<div class="callout-icon">&#10003;</div>
<div class="callout-body"><b>LABEL</b>Body text giving a practical tip.</div>
</div>
<div class="callout warn">
<div class="callout-icon">!</div>
<div class="callout-body"><b>LABEL</b>Body text warning about a trap.</div>
</div>
<div class="callout note">
<div class="callout-icon">i</div>
<div class="callout-body"><b>LABEL</b>Body text for a neutral side note.</div>
</div>
<div class="callout deep">
<div class="callout-icon">&#9670;</div>
<div class="callout-body"><b>LABEL</b>Body text for an optional deeper dive.</div>
</div>
```
Meaning of each flavor (topic-independent):
| Flavor | Color | Use for |
|---|---|---|
| `tip` | green, ✓ | best practice, a recommendation, a shortcut |
| `warn` | red, ! | a common mistake, risk, or thing to avoid |
| `note` | accent, i | a neutral aside, clarification, context |
| `deep` | gold, ◆ | optional depth: history, edge case, advanced detail |
Standard icon entities: tip `&#10003;` (✓), warn `!`, note `i`, deep `&#9670;` (◆). You may substitute a more fitting single glyph, but keep it one character.
### 6.6 Tables
Plain `<table>` with a header row. The styling (accent header, zebra rows) is automatic. Keep tables to a few columns so they fit A4 width.
```html
<table>
<tr><th>Column A</th><th>Column B</th></tr>
<tr><td>value</td><td>value</td></tr>
<tr><td>value</td><td>value</td></tr>
</table>
```
Tables are one of the most useful blocks for **non-technical** topics too: nutrient comparisons, vocabulary lists, pros/cons, decision matrices, dosage/timing, term glossaries.
---
## 7. Code blocks — optional, technical topics only
The dark `<pre>` block and the highlight span classes exist for subjects that genuinely involve code or other monospaced literal text (config, shell commands, formulas). **For non-technical guides, do not use `<pre>` blocks at all** — they would look out of place. Use tables, lists, callouts, and worked examples instead. (`code.inline` is fine everywhere for short literals.)
When you do use code, you **hand-write the highlighting** by wrapping tokens in spans. The classes are intentionally generic so they map onto any language:
| Class | Generic meaning | Typical use |
|---|---|---|
| `.c` | de-emphasized | comments |
| `.k` | keyword / control word | `if`, `function`, `class`, `return` |
| `.s` | literal value | strings, numbers |
| `.f` | callable name | function / method names |
| `.t` | type / tag / class | type names, HTML tags, class names |
| `.v` | identifier | variables |
| `.a` | annotation | attributes, decorators, directives |
Rules for code blocks:
- Keep snippets **short** (roughly 212 lines). They must fit on one page — `page-break-inside: avoid` is set, so an oversized block can overflow. Split long examples into several captioned blocks.
- **Escape HTML inside code**: write `&lt;`, `&gt;`, `&amp;`. This is the most common rendering bug.
- Inside the dark block, a comment uses `<span class="c">`. Indentation is literal spaces (the block is `white-space: pre`).
- You do not need to highlight every token — highlight the ones that aid reading (keywords, strings, names). Plain text inside `<pre>` is fine and renders in the default light color.
Example (PHP-flavored, but the pattern is language-agnostic):
```html
<pre><span class="k">function</span> <span class="f">greet</span>(<span class="t">string</span> <span class="v">$name</span>): <span class="t">string</span> {
<span class="k">return</span> <span class="s">"Hello, $name"</span>; <span class="c">// interpolation</span>
}</pre>
```
---
## 8. Pitfalls — read before building (these caused real bugs)
1. **Escape `<`, `>`, `&` inside `<pre>` and `<code>`.** Unescaped angle brackets silently swallow content or break layout. Always `&lt; &gt; &amp;`.
2. **Typographic quotes in prose, straight quotes in attributes.** In body text use the target language's real quotation marks (German `„ … "`, English `" … "`). Never let a quote character inside running text collide with HTML attribute quotes. If you generate the HTML from a script, be careful that closing typographic quotes are not accidentally written as escaped ASCII quotes — that corrupts both the string and any nearby `class="…"`. The safe approach: type real `„ … "` / `" … "` glyphs in prose, and reserve `"` strictly for HTML attributes.
3. **`--footer-label` must be a quoted CSS string**, e.g. `--footer-label: "Nutrition Guide";`. An unquoted value breaks the `@page` rule.
4. **Keep code blocks and callouts short enough to fit one page.** `page-break-inside: avoid` prevents splitting but cannot shrink an oversized block; it will overflow the page. Break large blocks up.
5. **Multibyte text is fine** (umlauts, accents, CJK, symbols) — the fonts and UTF-8 charset handle it. But if you ever measure string length in a generator script, count characters, not bytes.
6. **Chapter `<h1>` feeds the running header.** Keep it short; a very long chapter title wraps awkwardly in the 8pt header.
7. **Don't add web fonts or external assets.** The look depends on the system-font stack already specified. Adding fonts changes metrics and spacing.
8. **One accent, three shades.** Don't introduce extra brand colors. Variety comes from the callout colors (green/red/gold), which are fixed and meaningful — not decorative.
9. **Tables and code don't split** (`page-break-inside: avoid`). If a table is very long, either let it be its own short section or split it into two.
---
## 9. Build & verify
1. Write `guide.html` (single file, embedded `<style>`, UTF-8).
2. Convert:
```
weasyprint guide.html guide.pdf
```
3. **Verify visually.** Render a few pages to images and look at them — do not trust the HTML alone:
```
pdftoppm -png -r 80 -f 1 -l 1 guide.pdf cover # cover
pdftoppm -png -r 80 -f 2 -l 2 guide.pdf toc # contents
pdftoppm -png -r 80 -f 5 -l 6 guide.pdf body # a content spread
```
Check: cover gradient and title; TOC alignment; a part divider; at least one callout; at least one table; (if technical) one code block with highlighting; the running header showing the chapter title; no block overflowing a page edge; quotes and special characters rendering as glyphs, not boxes.
4. If something is off, fix the HTML and rebuild. Two or three iterations is normal.
5. Deliver **both** `guide.html` and `guide.pdf`.
---
## 10. Quick checklist
- [ ] Single self-contained HTML, embedded `<style>`, no external assets
- [ ] `:root` accent shades + `--footer-label` set for the topic
- [ ] Cover: logo glyph, title, subtitle, meta-row, faint deco glyph
- [ ] TOC lists every part and every chapter, sequential numbering
- [ ] Each part has a divider; each chapter starts with `.chapter-head` + `.lead`
- [ ] Callouts used sparingly (≤ ~2 per chapter), correct flavor
- [ ] Explanations ≤ 3 short main clauses; recommendations/warnings live in callouts, not prose
- [ ] Tables for comparisons/lists; code blocks only if technical, short, escaped
- [ ] Prose in the reader's language; terms explained on first use
- [ ] Built with WeasyPrint and **visually verified** by rendering pages
- [ ] Both HTML and PDF delivered
## 11. Dark mode (required)
The app toggles dark mode by setting `data-theme="dark"` on `<html>` inside its preview. Print/PDF always stays light.
- Define every color through the `:root` variables only (`--ink`, `--muted`, `--line`, `--bg-soft`, accent trio).
- Ship an additional override block:
```css
@media screen {
html[data-theme="dark"] {
--ink: #e6e8ee; --muted: #9aa3b2; --line: #2c3038; --bg-soft: #23262e;
/* lift accent shades so headings/links stay readable on dark */
}
html[data-theme="dark"] body { background: #15171c; }
}
```
- Do NOT use `prefers-color-scheme` — the app controls the attribute.
- Do not hardcode callout/infobox backgrounds — or darken them explicitly in the dark block (e.g. to `var(--bg-soft)`); the colored border stays.
- Keep dark rules inside `@media screen` only, so WeasyPrint/PDF renders the light theme.
- Elements with light text on accent backgrounds (table headers, cover) may keep their light-theme background.

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```
MINI-GUIDE STYLE (HTML/CSS → PDF via WeasyPrint)
FORMAT
- A4 portrait, 3-5 pages
- @page { size: A4; margin: 18mm 18mm 16mm 18mm; }
- Footer: page number center, guide title right
COVERAGE (lowest guide tier)
- ALL core building blocks of the topic — what you need to get started.
Which ones those are depends on the topic.
- The topic inventory is produced beforehand by a research agent and
supplied. It is binding: every item gets a section.
- Sections without chapter structure; code examples very short (2-7 lines)
- ~15-25 min reading time, 3-5 pages — this upper limit always applies
TARGET AUDIENCE — COMPACT BEGINNER INTRO
- Real beginners with no programming experience in the topic
- Assumes only general understanding ("what is programming")
- Terms are explained on first appearance
- NO language-character overview for experienced developers
- NO advanced features (even if cool and short)
CONTENT PRINCIPLES
- Show only absolute basics
- Topics someone can reproduce themselves after 15 min
- No tooling complexity (package managers, build systems, compilers)
- No language specialties (type systems, decorators, generics)
- No OOP if possible (or only the most trivial form)
- Depth of explanation before breadth of features
- Better 5 concepts thoroughly than 15 superficially
TYPICAL 5-SECTION STRUCTURE
1. Starting the language — installation, first file, first program
2. Variables — concept + 2-3 basic types
3. Control flow — if/else with a simple example
4. Lists + iteration — array + loop
5. Functions — declaration + call + return value
(This order builds on itself and ends with something meaningful.)
STRUCTURE
1. Compact head: logo left (16mm), title + subtitle center, badge + time right
2. Gap opener: opening question, italic and framed, low-threshold
3. 4-6 H2 sections with explanatory text + code example + optional callout
ELEMENTS
- Body text: justify with hyphenation
- Code blocks: dark background, syntax highlighting, very short (2-7 lines)
- Inline code: light background, accent color
- Tables: only if truly necessary (comparison operators etc.)
- Callouts in 3 flavors: tip (green), warn (red), note (accent color)
TYPOGRAPHY
- Body: 10.5pt serif (Charter), line-height 1.55
- Head h1: 20pt sans-serif bold
- H2 section: 13pt sans-serif bold
- Code: 8.5pt monospace, line-height 1.5
- Inline code: 9pt monospace
- Callout labels: 8pt uppercase, letter-spacing 1pt
COLORS (max 3 + neutrals)
- Accent color: strong, leaning on the topic's official color
- Accent dark: darker variant for accents
- Background soft: light variant of the accent color
- Code background: #1e2a3a
- Text: #1a1a1a / muted #5a6470 / line #d8dde3
- Callout colors: green/red/accent
GAP OPENER (REQUIRED)
- Italic, framed with an accent-color border
- Low-threshold question that the guide answers
- Sparks interest with a relevant statistic or practical angle
- NO technical terms that have not been explained yet
- Examples:
- "PHP läuft hinter rund drei Viertel aller Webseiten..."
- "JavaScript ist die Sprache des Webs aber wie schreibt man das eigentliche Code..."
- "Python ist die beliebteste Anfänger-Sprache..."
EXPLANATION DEPTH PER CONCEPT
- Name the concept (e.g. "Variable")
- Explain in one sentence what it is
- Code example with comments
- Mention language quirks (e.g. "in PHP beginnen Variablen mit $")
- NO reference to concepts that come later
CALLOUT USAGE
- tip (green): practice suggestion at the end, encouraging
- warn (red): beginner pitfalls ("= vs ==", "vergessenes Semikolon")
- note (accent): background info, explanation of a language quirk
CALLOUT CSS IMPORTANT
- .callout-body > b:first-child with display:block for the label
- NOT .callout-body b globally with display:block (destroys inline bold)
GAP CSS IMPORTANT
- .gap > b:first-child with display:block for the "FRAGE ZUM EINSTIEG" label
- NOT .gap b globally with display:block (destroys inline bold in the
question text)
TOPIC-SPECIFIC ADJUSTMENTS (choose before generating)
- Accent color: the topic's official color
- Logo letter(s) or abbreviation
- Welcome statistic in the gap opener
- Choose 4-6 beginner topics (see standard structure)
REQUIRED ELEMENTS
- 1 gap opener at the start
- 5-7 code examples (short, 2-7 lines, beginner-friendly)
- At least 1 callout (often: warn for a pitfall, tip for practice at the end)
- Inline code for technical terms
AVOID
- TOC or cover (oversized for 15 min)
- Introductory filler ("In diesem Mini-Guide lernen wir...")
- Claims of completeness (belongs in a larger guide)
- Reference tables without explanatory text (belongs in a cheatsheet)
- Recall or next-step at the end (a mini-guide ends with content)
- Topics that are advanced (even if cool):
- Type systems, type hints, generics
- OOP features (except the most trivial form)
- Tooling (package managers, build, linting)
- Language specialties (PHP: strict_types, readonly, Composer, PSR-4)
- page break in the middle of a code block or callout
(page-break-inside: avoid)
- More than 3 font sizes per section
- Floats or absolute positioning (breaks in WeasyPrint)
- Technical terms without explanation
- References to concepts that come later
- Edge cases and "but" sentences
GENERATION WITH FEEDBACK LOOP (max 3 iterations)
1. Write the HTML
2. weasyprint file.html file.pdf
3. PDF to PNGs: convert all pages
4. View all pages
5. Check:
- Head clean (logo does not overlap the title)?
- Code blocks not torn across page breaks?
- Callouts fully visible?
- Inline bolds in callouts/gap correct (not rendered as blocks)?
- Footer with page number correct?
- Would a real beginner understand this?
- Were all technical terms explained on first appearance?
6. On problems: fix, repeat from step 2
7. Output after max 3 iterations
INSTALLATION
- pip install weasyprint pdf2image
- apt install poppler-utils
```
DARK MODE (REQUIRED)
- Define all colors exclusively via :root variables
(--ink, --muted, --line, --bg-soft, accent variables).
- Additionally ship a dark-mode block:
@media screen {
html[data-theme="dark"] { ...dark variable values... }
html[data-theme="dark"] body { background: #15171c; }
}
- The app enables it via data-theme="dark" on <html>.
Do NOT use prefers-color-scheme.
- Dark values: dark backgrounds (#15171c / #23262e), light text (#e6e8ee),
muted lines (#2c3038). Lift accent colors so headings and links stay
readable on a dark background (check contrast). Elements with light text on
accent backgrounds (e.g. table headers) may keep their light background
color.
- Do not hardcode callout/infobox backgrounds — or darken them explicitly in
dark mode (e.g. to var(--bg-soft)); the colored border stays.
- Only inside @media screen — print/PDF stays light.

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```
ONEPAGER STYLE LANDSCAPE (HTML/CSS → PDF via WeasyPrint)
FORMAT
- A4 landscape (297mm × 210mm)
- @page { size: A4 landscape; margin: 0; }
- Padding: 9mm 11mm 9mm 11mm
LAYOUT
- Grid: hero+stats (auto) / divider / main (1fr, 3 columns) / footer (absolute)
- Stats bar integrated into the hero (right), saves vertical space
- Main: 3 equal-width columns, gap 4mm
- Columns internally: flex-column, gap 4mm
- 6 thematic blocks distributed (2 per column)
STRUCTURE (in this order)
1. Hero: logo left (22mm), title + subtitle center, 4 stats right
2. Divider: 1.5pt black line
3. Main grid: 6 blocks in 3 columns
4. Footer: colored box with key message + tag (absolute, bottom)
DIFFERENCES FROM PORTRAIT
- 3 columns instead of 2 (more horizontal space)
- 6 blocks instead of 4-5
- Stats integrated into the hero instead of their own row
- Smaller font sizes (9.5pt body instead of 10pt)
- More compact code blocks (7pt instead of 7.5pt)
BLOCK STRUCTURE
- Title: 9.5pt bold uppercase, icon left, accent-color underline 2pt
- Content: visual, not plain text bullets
- Variants: icon list, code block, tile grid, plus/minus columns, type grid
COLORS (max 3 + neutrals)
- Accent color: lean on the topic's official color
- Accent dark: for headings
- Accent darker: for the footer
- Accent color: contrasting
- Background soft: light variant of the accent color
- Code background: #1e2a3a
- Text: #1a1a1a / muted #5a6470 / line #e5e5e5
TYPOGRAPHY
- Body: 9.5pt, line-height 1.4
- Hero h1: 20pt bold
- Block title: 9.5pt bold uppercase, letter-spacing 0.5pt
- Stats number: 14pt bold, label 6.5pt uppercase
- Code: 7pt monospace, dark background
- Feature text: 8.5pt
- Max 3 font sizes per block
ICONS
- SVG inline, stroke instead of fill
- 4mm in block titles (smaller than portrait due to compact layout)
- 2.8mm in tile icons
- currentColor for automatic adaptation
TOPIC-SPECIFIC ADJUSTMENTS (choose before generating)
- Accent color: the topic's official color
- Logo letter(s) or abbreviation
- 4 stats: topic-relevant numbers
- Block selection: the 6 most important aspects for a first overview
REQUIRED VISUAL ELEMENTS
- At least 1 code block
- At least 1 tile grid with icons (ecosystem)
- At least 1 plus/minus split (modern vs legacy etc.)
- Footer as a colored box (visual anchor)
- Stats bar in the hero
AVOID
- Plain bullet lists in every block
- More than 6 main blocks (landscape already has more space)
- More than 3 font sizes
- Marketing filler in the hero
- Floats or absolute positioning (except for the footer)
- Vertically very long blocks (would unbalance the columns)
GENERATION WITH FEEDBACK LOOP (max 3 iterations)
1. Write the HTML
2. weasyprint file.html file.pdf
3. PDF to PNG: python -c "from pdf2image import convert_from_path; convert_from_path('file.pdf', dpi=120)[0].save('preview.png')"
4. View the preview with the Read tool
5. Check:
- Stats bar does not overlap the title?
- 3 columns balanced (similar height)?
- Footer not cut off?
- Code block readable?
- All icons render?
6. On problems: fix, repeat from step 2
7. Output after max 3 iterations
INSTALLATION
- pip install weasyprint pdf2image
- apt install poppler-utils
```
DARK MODE (REQUIRED)
- Define all colors exclusively via :root variables
(--ink, --muted, --line, --bg-soft, accent variables).
- Additionally ship a dark-mode block:
@media screen {
html[data-theme="dark"] { ...dark variable values... }
html[data-theme="dark"] body { background: #15171c; }
}
- The app enables it via data-theme="dark" on <html>.
Do NOT use prefers-color-scheme.
- Dark values: dark backgrounds (#15171c / #23262e), light text (#e6e8ee),
muted lines (#2c3038). Lift accent colors so headings and links stay
readable on a dark background (check contrast). Elements with light text on
accent backgrounds (e.g. table headers) may keep their light background
color.
- Do not hardcode callout/infobox backgrounds — or darken them explicitly in
dark mode (e.g. to var(--bg-soft)); the colored border stays.
- Only inside @media screen — print/PDF stays light.