@@ -1 +1,4 @@
 *.sh text eol=lf
+docs/index.html linguist-generated=true
+docs/guide/*.html linguist-generated=true
+docs/assets/search-index.json linguist-generated=true
@@ -0,0 +1,140 @@
+"""Build the dependency-free documentation site. Generated HTML is committed for easy preview."""
+import argparse
+import html
+import hashlib
+import importlib.util
+import json
+from pathlib import Path
+import re
+
+ROOT = Path(__file__).resolve().parents[2]
+DOCS = ROOT / "docs"
+spec = importlib.util.spec_from_file_location("documentation_content", DOCS / "_src/content.py")
+content = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(content)
+
+
+def slug(value):
+    return re.sub(r"[^a-z0-9]+", "-", value.lower()).strip("-")
+
+
+def highlight(code, kind):
+    if kind == "shell":
+        return html.escape(code)
+    tokens = re.compile(r'//[^\n]*|"(?:\\.|[^"\\])*"|\b(?:using|var|new|public|class|static|override|void|if|foreach|in|return|throw|false|true|null|typeof|params|string|object|int)\b|\b\d+\b')
+    result, end = [], 0
+    for match in tokens.finditer(code):
+        result.append(html.escape(code[end:match.start()]))
+        value = match.group()
+        css = "comment" if value.startswith("//") else "string" if value.startswith('"') else "number" if value.isdigit() else "keyword"
+        result.append(f'<span class="syntax-{css}">{html.escape(value)}</span>')
+        end = match.end()
+    result.append(html.escape(code[end:]))
+    return ''.join(result)
+
+
+def example_html(example, instance):
+    eid = slug(instance + "-" + example["id"])
+    label = "Inside Up() / BuildUp(MigrationBuilder migration)" if example["kind"] == "body" else "Shared commands · both styles" if example["kind"] == "shell" else "Shared host · both styles" if example["classic"] == example["fluent"] else "Choose one authoring style"
+    controls = ''.join(f'<button type="button" id="{eid}-{style}-tab" data-style="{style}" aria-controls="{eid}-{style}">{style.title()}</button>' for style in ("classic", "fluent"))
+    panels = []
+    for style in ("classic", "fluent"):
+        panels.append(f'''<section class="code-panel" id="{eid}-{style}" data-code-style="{style}">
+<div class="code-label"><h3>{style.title()}</h3><button type="button" data-copy="{eid}-{style}-code" hidden aria-label="Copy {style} example">Copy</button></div>
+<pre tabindex="0" aria-label="{html.escape(example['title'])}, {style}"><code id="{eid}-{style}-code">{highlight(example[style], example['kind'])}</code></pre></section>''')
+    return f'''<div class="code-example" data-example="{example['id']}"><div class="code-toolbar"><span>{html.escape(example['title'])}</span><div class="code-tabs" aria-label="Code style" hidden>{controls}</div></div>{''.join(panels)}<p class="code-caption">{label}</p></div>'''
+
+
+def header(prefix, guide=False):
+    return f'''<a class="skip" href="#main">Skip to content</a>
+<header class="site-header"><div class="header-inner">
+<a class="brand" href="{prefix}index.html" aria-label="Migrator.NET home"><span class="brand-mark" aria-hidden="true">m<span>↗</span></span>Migrator<span class="brand-suffix">.NET</span></a>
+<nav aria-label="Main navigation"><a href="{prefix}guide/index.html"{' aria-current="true"' if guide else ''}>Documentation</a><a href="{prefix}index.html#sqlite">SQLite</a><a href="{prefix}index.html#compare">Compare</a><a href="https://github.com/dotnetprojects/Migrator.NET">GitHub ↗</a></nav>
+<div class="search-wrap" data-search-index="{prefix}assets/search-index.json" hidden><form role="search"><label class="sr-only" for="doc-search">Search documentation</label><input id="doc-search" type="search" placeholder="Search the manual…" autocomplete="off" aria-controls="search-results" aria-describedby="search-status"><button aria-label="Search" type="submit">↵</button></form><div class="search-popover" hidden><p id="search-status" role="status"></p><ul id="search-results"></ul></div></div>
+</div></header>'''
+
+
+def footer(prefix):
+    return f'''<footer class="site-footer"><a class="brand" href="{prefix}index.html">Migrator.NET</a><p>Explicit changes. A lasting record.<br>DotNetProjects · MPL-1.1</p><a href="{prefix}guide/quick-start.html">Write your first migration ↗</a></footer><span id="copy-status" class="sr-only" role="status" aria-live="polite"></span>'''
+
+
+def document(title, description, body, prefix="", body_class=""):
+    css_version = hashlib.sha256((DOCS / "assets/site.css").read_text(encoding="utf-8").encode()).hexdigest()[:12]
+    js_version = hashlib.sha256((DOCS / "assets/site.js").read_text(encoding="utf-8").encode()).hexdigest()[:12]
+    return f'''<!doctype html>
+<!-- Generated by .github/scripts/build-docs.py; edit docs/_src/ instead. -->
+<html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><meta name="description" content="{html.escape(description, quote=True)}"><meta name="theme-color" content="#f4f1e9"><title>{html.escape(title)} · Migrator.NET</title><link rel="icon" href="{prefix}assets/favicon.svg" type="image/svg+xml"><link rel="stylesheet" href="{prefix}assets/site.css?v={css_version}"><script src="{prefix}assets/site.js?v={js_version}" defer></script></head><body class="{body_class}">{body}</body></html>
+'''
+
+
+def navigation(current):
+    groups = list(dict.fromkeys(page['group'] for page in content.PAGES))
+    result = ['<aside class="docs-sidebar"><details class="chapter-menu" open><summary>Browse the manual</summary><nav aria-label="Documentation chapters"><a class="manual-index" href="index.html">The migration manual</a>']
+    for i, group in enumerate(groups):
+        result.append(f'<div class="chapter-group"><h2><span>{i+1:02}</span> {html.escape(group)}</h2><ul>')
+        for page in content.PAGES:
+            if page['group'] == group:
+                current_attr = ' aria-current="page"' if current == page["slug"] else ""
+                result.append(f'<li><a href="{page["slug"]}.html"{current_attr}>{html.escape(page["title"])}</a></li>')
+        result.append('</ul></div>')
+    return ''.join(result) + '</nav></details></aside>'
+
+
+def render_page(page, index):
+    sections = []
+    for si, section in enumerate(page['sections']):
+        blocks = [example_html(block, f'{page["slug"]}-{si}-{bi}') if isinstance(block, dict) else block for bi, block in enumerate(section['blocks'])]
+        sections.append(f'<section id="{slug(section["title"])}"><h2>{html.escape(section["title"])}</h2>{"".join(blocks)}</section>')
+    toc = '<aside class="page-toc"><p>On this page</p><nav aria-label="On this page">' + ''.join(f'<a href="#{slug(s["title"])}">{html.escape(s["title"])}</a>' for s in page['sections']) + '</nav></aside>'
+    links = []
+    for label, pos in (("Previous", index-1), ("Next", index+1)):
+        if 0 <= pos < len(content.PAGES):
+            target = content.PAGES[pos]
+            links.append(f'<a href="{target["slug"]}.html"><span>{label}</span>{html.escape(target["title"])} {"→" if label == "Next" else ""}</a>')
+    article = f'''<main class="docs-article" id="main"><div class="breadcrumb"><a href="index.html">Manual</a><span>/</span>{html.escape(page['group'])}</div><h1>{html.escape(page['title'])}</h1><p class="lead">{html.escape(page['summary'])}</p><p class="sample-note">Examples use <strong>Classic</strong> and <strong>Fluent</strong> tabs. Your choice follows you through the manual.</p>{''.join(sections)}<div class="source-link"><a href="https://github.com/dotnetprojects/Migrator.NET/blob/master/{page['source']}">Implementation reference ↗</a><a href="https://github.com/dotnetprojects/Migrator.NET/blob/master/docs/_src/content.py">Improve this page ↗</a></div><nav class="page-turn" aria-label="Adjacent chapters">{''.join(links)}</nav></main>'''
+    return document(page['title'], page['summary'], header('../', True) + '<div class="docs-layout">' + navigation(page['slug']) + article + toc + '</div>' + footer('../'), '../', 'documentation')
+
+
+def render_index():
+    groups = list(dict.fromkeys(page['group'] for page in content.PAGES))
+    items = []
+    for i, group in enumerate(groups):
+        items.append(f'<section class="manual-group"><h2><span>{i+1:02}</span>{html.escape(group)}</h2><ul>')
+        for page in content.PAGES:
+            if page['group'] == group:
+                items.append(f'<li><a href="{page["slug"]}.html">{html.escape(page["title"])} <span>↗</span></a><p>{html.escape(page["summary"])}</p></li>')
+        items.append('</ul></section>')
+    main = f'<main id="main" class="manual-home"><p class="eyebrow">DOTNETPROJECTS / THE MIGRATION MANUAL</p><h1>Know what changes.<br><em>Know how it runs.</em></h1><p class="lead">From your first table to deployment locks and SQLite reconstruction. Practical guides with a Classic and Fluent example for every authoring task.</p><a class="button primary" href="quick-start.html">Start with a working example ↗</a><div class="manual-directory">{"".join(items)}</div></main>'
+    return document('The migration manual', 'Detailed C# database migration documentation with Classic and Fluent examples.', header('../', True) + main + footer('../'), '../', 'documentation')
+
+
+def outputs():
+    result = {DOCS / 'guide/index.html': render_index()}
+    search = []
+    for i, page in enumerate(content.PAGES):
+        result[DOCS / 'guide' / (page['slug'] + '.html')] = render_page(page, i)
+        prose = ' '.join(block if isinstance(block, str) else block['title'] + ' ' + block['classic'] + ' ' + block['fluent'] for section in page['sections'] for block in section['blocks'])
+        search.append(dict(title=page['title'], group=page['group'], summary=page['summary'], url='guide/' + page['slug'] + '.html', text=html.unescape(re.sub('<[^>]+>', ' ', prose))))
+    result[DOCS / 'assets/search-index.json'] = json.dumps(search, ensure_ascii=False, indent=2) + '\n'
+    home = (DOCS / '_src/home.html').read_text(encoding='utf-8')
+    for key, value in dict(header=header(''), footer=footer(''), hero=example_html(content.CREATE_USERS, 'hero'), install=example_html(content.INSTALL, 'install'), sqlite=example_html(content.SQLITE_ALTER, 'sqlite'), comparison=(DOCS / '_src/comparison.html').read_text(encoding='utf-8')).items():
+        home = home.replace('{{' + key + '}}', value)
+    result[DOCS / 'index.html'] = document('Database changes, written in C#', 'Classic and Fluent C# migrations. Automatic SQLite schema reconstruction. A complete manual for your next database change.', home, body_class='homepage')
+    return result
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--check', action='store_true', help='Fail if generated files are stale.')
+    args = parser.parse_args()
+    stale = []
+    for path, text in outputs().items():
+        if args.check:
+            if not path.exists() or path.read_text(encoding='utf-8') != text:
+                stale.append(str(path.relative_to(ROOT)))
+        else:
+            path.parent.mkdir(parents=True, exist_ok=True)
+            path.write_text(text, encoding='utf-8', newline='\n')
+    if stale:
+        raise SystemExit('Regenerate docs: ' + ', '.join(stale))
+    print(f'{"Checked" if args.check else "Built"} {len(content.PAGES)} chapters, documentation index, homepage and search index.')
@@ -0,0 +1,32 @@
+"""Regression checks for documentation paths on both Windows and Linux."""
+import importlib.util
+from pathlib import Path
+import tempfile
+import unittest
+
+spec = importlib.util.spec_from_file_location("verify_docs", Path(__file__).with_name("verify-docs.py"))
+verifier = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(verifier)
+
+
+class ExactPathTests(unittest.TestCase):
+    def test_checks_file_and_directory_case_and_relative_links(self):
+        with tempfile.TemporaryDirectory() as directory:
+            root = Path(directory)
+            (root / "Mysql").mkdir()
+            (root / "Mysql/MySqlTransformationProvider.cs").write_text("", encoding="utf-8")
+            (root / "index.html").write_text("", encoding="utf-8")
+            for relative, expected in (
+                ("Mysql/MySqlTransformationProvider.cs", True),
+                ("Mysql/MysqlTransformationProvider.cs", False),
+                ("mysql/MySqlTransformationProvider.cs", False),
+                ("Mysql/Missing.cs", False),
+                ("Mysql/../index.html", True),
+                ("Mysql/../Index.html", False),
+            ):
+                with self.subTest(path=relative):
+                    self.assertEqual(verifier.exact_path_exists(root, relative), expected)
+
+
+if __name__ == "__main__":
+    unittest.main()