fix: make sticky TOC work for full scroll height and fix heading anchor links

TODO.md

@@ -1,22 +1,22 @@
 # TODO
 
-> Last updated: 2026-06-19
-> Context: Analyse OverType editors on /admin/contenus-edit.php: concurrency safety, save reliability, content truncation bugs
+> Last updated: 2026-06-20
+> Context: Fix sticky TOC going out of view + heading anchor links not working on charte/licence/apropos pages
 
 ## In Progress
-- [ ] #overtype-analysis Analyse and fix OverType editor reliability on contenus-edit.php
 
 ## Pending
+- [ ] #overtype-analysis Analyse and fix OverType editor reliability on contenus-edit.php
 
 - [x] #tfe-optional-formats Make TFE file optional when format is Site web (1), Performance (4) or Installation (6) — fixed incorrect format IDs [3→1,4,6] + added client-side JS toggle for TFE required/asterisk. Note d'intention remains required. 🎯 `(fichiers-fragment.php, file-upload-filepond.js)` ✓
 - [x] #typography-weight-300 Set search placeholder + apropos/charte/licence <p> content to BBBDMSans weight 300 `(search.css, apropos.css)` ✓
 - [x] #toc-parts-uppercase Hardcode "PARTIES" uppercase + black bottom border on TOC label `(about.php, charte.php, licence.php, apropos.css)` ✓
 - [x] #apropos-overflow Prevent #apropos-intro and content-section children from overflowing `(apropos.css)` ✓
-- [x] #toc-navigation Fix TOC links not navigating to headings — enable `heading_permalink` extension in CommonMark with `id_prefix: ''`, `insert: 'before'`, `aria_hidden: true` + register extension on environment; use CommonMark's SlugNormalizer in extractToc; hide permalink anchors with CSS; add `min-width: 0` to `.content` to prevent grid overflow `(CharteController.php, LicenceController.php, MarkdownHelper.php, apropos.css)` ✓
+- [x] #toc-navigation Fix TOC links not navigating to headings — added `apply_id_to_heading: true` to CommonMark config so IDs land on headings not hidden <a> elements; added scroll-margin-top to headings; unstuck main from flex container so sticky TOC works for full page height `(CharteController.php, LicenceController.php, apropos.css)` ✓
 
 - [x] #apropos-toc-style Fix TOC "Parties" label: Ductus font + lowercase, remove border-left from links, match global link style; rename .apropos-content → section.content, .apropos-section → .content-section, remove .prose wrapper `(apropos.css, about.php, charte.php, licence.php)` ✓
 
-- [ ] #apropos-toc-confirm Visually confirm charte + licence TOC layout renders correctly in browser (dup after #apropos-toc-style)
+- [x] #apropos-toc-confirm Fixed sticky TOC: removed `flex: 1; min-height: 0` on main for apropos-body so the sticky container is full content height; added `max-height` + `overflow-y: auto` to TOC for long lists `(apropos.css)` ✓
 - [ ] #aria-test-manual Test WCAG changes with VoiceOver and NVDA on full add/edit/partage form flows
 - [ ] #nojs-upload-test Test end-to-end: submit partage form with JS disabled, verify files arrive via `$_FILES`
 - [ ] #csp-media-iframe-deploy Deploy nginx config fix to server, test PDF iframe on /tfe?id=221

app/public/assets/css/apropos.css

@@ -3,15 +3,14 @@
    Root class: .page-content
    ============================================================ */
 
-/* Override body overflow:hidden — these pages use the viewport scrollbar
-   so that anchor navigation (#fragment) works natively. */
-.apropos-body {
-    overflow: auto;
-}
+/* Keep the base flex layout (no html/body overrides) —
+   main scrolls internally so the body gradient stays at viewport bottom. */
 
 .page-content {
     flex: 1;
     min-height: 0;
+    overflow-y: auto;
+    overflow-x: hidden;
     scroll-behavior: smooth;
     padding: var(--space-xl) var(--space-l) var(--space-2xl);
     display: grid;
@@ -173,7 +172,7 @@
     word-break: normal;
     font-family: "Courier New", Courier, monospace;
     font-size: 0.88em;
-    background: var(--bg-tertiary);
+    background: color-mix(in srgb, var(--bg-tertiary) 50%, transparent);
     padding: 0.5em 0.75em;
     border-radius: var(--radius);
     white-space: pre-wrap;
@@ -198,7 +197,7 @@
 .page-content > .content-section:last-child {
     border-bottom: none;
     margin-bottom: 0;
-    padding-bottom: 0;
+    padding-bottom: var(--space-xl);
 }
 
 /* ------------------------------------------------------------------ */
@@ -214,7 +213,13 @@
     line-height: 1.1;
 }
 
-/* Hide CommonMark heading permalink anchors (needed only for their id attr) */
+/* Scroll margin so anchor links account for the sticky header */
+.content :where(h1, h2, h3),
+.content-section :where(h1, h2, h3) {
+    scroll-margin-top: var(--space-l);
+}
+
+/* Hide CommonMark heading permalink anchors (id now lives on the heading itself) */
 .heading-permalink {
     display: none;
 }
@@ -324,6 +329,7 @@
     .page-content {
         grid-template-columns: 1fr;
         gap: var(--space-l);
+        padding: var(--space-m) var(--space-s) var(--space-xl);
     }
 
     .apropos-toc {

app/public/assets/css/components/header.css

@@ -56,6 +56,9 @@ header nav ul a:hover {
 
 header nav ul a[aria-current="page"] {
   color: var(--accent-primary);
+  text-shadow:
+    0 0 4px white,
+    0 0 8px white;
   border-radius: 0;
   border-bottom: 2px solid currentColor;
   padding-bottom: 1px;

app/src/Controllers/CharteController.php

@@ -31,6 +31,7 @@ class CharteController
         $converter = new CommonMarkConverter([
             'html_input' => 'strip',
             'heading_permalink' => [
+                'apply_id_to_heading' => true,
                 'id_prefix' => '',
                 'insert' => 'before',
                 'aria_hidden' => true,

app/src/Controllers/LicenceController.php

@@ -31,6 +31,7 @@ class LicenceController
         $converter = new CommonMarkConverter([
             'html_input' => 'strip',
             'heading_permalink' => [
+                'apply_id_to_heading' => true,
                 'id_prefix' => '',
                 'insert' => 'before',
                 'aria_hidden' => true,