diff --git a/docs/content.md b/docs/content.md
index b7afe21..17b093b 100644
--- a/docs/content.md
+++ b/docs/content.md
@@ -77,6 +77,24 @@ Markdown content here (include your own heading)...
 
 The markdown content is rendered as-is, so include your own `# Heading` if desired.
 
+### Supported Markdown Features
+
+Pages are rendered with [Python-Markdown](https://python-markdown.github.io/) with the following extensions enabled:
+
+| Feature | Syntax | Notes |
+|---------|--------|-------|
+| Headings | `# H1` through `### H3` | Rendered with `.prose` styling |
+| Bold / Italic | `**bold**`, `*italic*` | Standard Markdown |
+| Links | `[text](url)` | Relative paths supported |
+| Unordered lists | `- item` or `* item` | Nested lists supported (3 levels) |
+| Ordered lists | `1. item` | Nested lists supported (3 levels) |
+| Tables | Pipe-delimited (`\| Header \|`) | Auto-generated `<thead>`/`<tbody>` |
+| Fenced code blocks | ` ``` ` with optional language | Syntax highlighting via `codehilite` extension |
+| Inline code | `` `code` `` | Styled with monospace font |
+| Blockquotes | `> quote` | Left border styling |
+| Images | `![alt](/media/image.png)` | Use absolute paths to `/media/` |
+| Table of contents | `[TOC]` marker | Auto-generated from headings |
+
 ## Docker Configuration
 
 With Docker, mount the content directory as a read-only volume. This is already configured in `docker-compose.yml`:
diff --git a/docs/plans/20260506-1830-markdown-parsing/plan.md b/docs/plans/20260506-1830-markdown-parsing/plan.md
new file mode 100644
index 0000000..431e0c6
--- /dev/null
+++ b/docs/plans/20260506-1830-markdown-parsing/plan.md
@@ -0,0 +1,145 @@
+# Plan: Markdown Nested Lists & Map Collapsible Filters
+
+Date: 2026-05-06
+
+## Part A: Fix Markdown Prose Styling
+
+### Problem
+
+Two CSS issues in custom markdown pages:
+
+1. **Excessive top spacing** — The first element inside `.prose` (typically an `<h1>`) gets both the DaisyUI `card-body` padding AND its own `margin-top: 1.5rem`, creating a large gap before content starts. The `.prose h1` rule at `app.css:166` applies `margin-top: 1.5rem` unconditionally.
+
+2. **No nested list differentiation** — All list levels use the same bullet style (`disc`) because the `.prose` CSS in `app.css:199-215` only styles `ul`, `ol`, and `li` at a single level. Python-Markdown correctly generates nested `<ul>`/`<ol>` HTML — the issue is CSS-only.
+
+### Changes
+
+#### 1. Remove top margin on first prose child (`app.css`)
+
+Add after the `.prose` block (after line 256, the closing brace):
+
+```css
+.prose > :first-child {
+    margin-top: 0;
+}
+```
+
+This eliminates the double-spacing (card-body padding + h1 margin-top) for the first element. Subsequent headings still get their normal `margin-top` for visual separation between sections.
+
+**Specificity note:** `.prose > :first-child` and `.prose h1` have identical specificity (0-1-1). This rule works only because it appears later in the source. Avoid adding new heading styles after this rule — the top-margin override would silently break.
+
+#### 2. Add nested list CSS to `app.css`
+
+Add after the `.prose li` block (line 215):
+
+```css
+.prose ul ul { list-style-type: circle; }
+.prose ul ul ul { list-style-type: square; }
+.prose ol ol { list-style-type: lower-alpha; }
+.prose ol ol ol { list-style-type: lower-roman; }
+.prose ul ul, .prose ul ol,
+.prose ol ul, .prose ol ol { margin-top: 0.25rem; margin-bottom: 0; }
+```
+
+This provides:
+- Level 1: disc / decimal
+- Level 2: circle / lower-alpha
+- Level 3+: square / lower-roman
+
+#### 3. Update `docs/content.md`
+
+Add a "Supported Markdown Features" section documenting:
+- Basic formatting (headings, bold, italic, links)
+- Lists (ordered, unordered, nested)
+- Tables (pipe-delimited)
+- Code blocks (fenced with triple backticks, optional language)
+- Table of contents (`[TOC]` marker)
+- Images (require absolute paths to `/media/`)
+
+### Files
+
+| File | Change |
+|------|--------|
+| `src/meshcore_hub/web/static/css/app.css` | Add `:first-child` rule + nested list CSS rules |
+| `docs/content.md` | Add markdown features section |
+| `tests/test_web/test_pages.py` | Add test for nested list HTML output |
+
+---
+
+## Part B: Map Page Collapsible Filters
+
+### Problem
+
+The map page (`src/meshcore_hub/web/static/js/spa/pages/map.js:195-237`) uses a hardcoded non-collapsible filter card:
+
+```html
+<div class="card shadow mb-6 panel-solid" style="--panel-color: var(--color-neutral)">
+```
+
+Other list pages (nodes, messages, advertisements) use `renderFilterCard()` from `components.js:724-766` with `collapsible: true`, which renders as:
+
+```html
+<details class="collapse collapse-arrow bg-base-200 border-2 border-base-content/25 rounded-box mb-6">
+```
+
+The map page is inconsistent with the rest of the SPA.
+
+### Approach
+
+Wrap the map's existing filter controls in the same collapsible `<details>` DaisyUI pattern, but keep the map's custom client-side filter logic. Do **not** refactor to use `renderFilterCard()` — the map has unique behaviors (client-side filtering, show-labels toggle, member filter triggers API re-fetch) that don't fit the shared component's server-side form submission model.
+
+### Changes
+
+#### 1. Replace filter card HTML in `map.js`
+
+Replace lines 195-237 (the hardcoded `<div class="card">`) with:
+
+```html
+<details class="collapse collapse-arrow bg-base-200 border-2 border-base-content/25 rounded-box mb-6"
+         ?open=${isFilterOpen}>
+    <summary class="collapse-title text-sm font-medium cursor-pointer">
+        ${t('common.filters')}
+    </summary>
+    <div class="collapse-content pt-4">
+        <div class="flex gap-4 flex-wrap items-end">
+            <!-- existing filter controls unchanged -->
+        </div>
+    </div>
+</details>
+```
+
+#### 2. Add collapsible state persistence
+
+Before the `litRender()` call, add the same pattern used by other pages:
+
+```javascript
+const existingDetails = container.querySelector('details.collapse');
+const isFilterOpen = existingDetails ? existingDetails.open : false;
+```
+
+**Behavior note:** On first visit (no prior DOM state), the filter starts **closed**. This is consistent with all other list pages (nodes, messages, advertisements), but is a change from the current map behavior where the filter card is always visible. Users who want to see filters will need to click to expand — same as every other page in the SPA.
+
+**Re-render note:** State persistence works because `container.querySelector` inspects the pre-existing DOM before `litRender` replaces content. If the map ever re-renders on every pan/zoom (not just filter changes), the filter would collapse on each re-render. The current map only re-renders on filter changes, so this is not an issue.
+
+#### 3. Preserve all existing filter logic
+
+- `applyFilters()` / `applyFiltersCore()` — unchanged
+- `@change=${applyFilters}` event handlers — unchanged
+- `clearFiltersHandler()` — unchanged
+- Show-labels checkbox — unchanged
+- Member filter re-fetch logic — unchanged
+
+### Files
+
+| File | Change |
+|------|--------|
+| `src/meshcore_hub/web/static/js/spa/pages/map.js` | Replace filter card HTML with collapsible `<details>`, add state persistence |
+
+---
+
+## Testing
+
+- `pytest tests/test_web/test_pages.py` — verify Python-Markdown generates nested `<ul>`/`<ol>` HTML for indented markdown (NOT CSS rendering)
+- `pre-commit run --all-files` — quality checks
+- Manual: create a test `.md` page with nested lists, verify visual rendering with different bullet/indentation levels
+- Manual: load map page, verify filter section collapses/expands correctly, survives re-render after filter changes
diff --git a/docs/plans/20260506-1830-markdown-parsing/tasks.md b/docs/plans/20260506-1830-markdown-parsing/tasks.md
new file mode 100644
index 0000000..11a5dd5
--- /dev/null
+++ b/docs/plans/20260506-1830-markdown-parsing/tasks.md
@@ -0,0 +1,17 @@
+# Tasks: Markdown Nested Lists & Map Collapsible Filters
+
+## Part A: Fix Markdown Prose Styling
+
+- [ ] Add `.prose > :first-child { margin-top: 0; }` to `app.css` after the `.prose` block (after line 256)
+- [ ] Add nested list CSS rules to `app.css` after the `.prose li` block (line 215)
+- [ ] Update `docs/content.md` with "Supported Markdown Features" section
+- [ ] Add nested list HTML output test to `tests/test_web/test_pages.py`
+- [ ] Run `pytest tests/test_web/test_pages.py`
+- [ ] Run `pre-commit run --all-files`
+
+## Part B: Map Page Collapsible Filters
+
+- [ ] Add `isFilterOpen` state persistence logic before `litRender()` in `map.js`
+- [ ] Replace hardcoded `<div class="card">` filter card (lines 195-237) with collapsible `<details>` in `map.js`
+- [ ] Verify all existing filter logic preserved (`applyFilters`, `clearFiltersHandler`, show-labels, member filter)
+- [ ] Manual: load map page, verify filter collapses/expands, survives re-render after filter changes
diff --git a/src/meshcore_hub/web/static/css/app.css b/src/meshcore_hub/web/static/css/app.css
index 57cbe71..e42499d 100644
--- a/src/meshcore_hub/web/static/css/app.css
+++ b/src/meshcore_hub/web/static/css/app.css
@@ -214,6 +214,13 @@
     margin-bottom: 0.25rem;
 }
 
+.prose ul ul { list-style-type: circle; }
+.prose ul ul ul { list-style-type: square; }
+.prose ol ol { list-style-type: lower-alpha; }
+.prose ol ol ol { list-style-type: lower-roman; }
+.prose ul ul, .prose ul ol,
+.prose ol ul, .prose ol ol { margin-top: 0.25rem; margin-bottom: 0; }
+
 .prose a {
     color: var(--color-primary);
     text-decoration: underline;
@@ -255,6 +262,10 @@
     word-break: break-word;
 }
 
+.prose > :first-child {
+    margin-top: 0;
+}
+
 .prose table {
     width: 100%;
     margin-bottom: 1rem;
diff --git a/src/meshcore_hub/web/static/js/spa/pages/map.js b/src/meshcore_hub/web/static/js/spa/pages/map.js
index 84a56c4..718df11 100644
--- a/src/meshcore_hub/web/static/js/spa/pages/map.js
+++ b/src/meshcore_hub/web/static/js/spa/pages/map.js
@@ -67,19 +67,6 @@ function createNodeIcon(node, oidcEnabled) {
 
 // Leaflet popup requires plain HTML strings, so keep escapeHtml here
 function createPopupContent(node, oidcEnabled) {
-    let ownerHtml = '';
-    if (node.owner) {
-        const ownerDisplay = node.owner.callsign
-            ? escapeHtml(node.owner.name) + ' (' + escapeHtml(node.owner.callsign) + ')'
-            : escapeHtml(node.owner.name);
-        ownerHtml = '<p><span class="opacity-70">' + ((window.t && window.t('map.owner')) || 'Owner:') + '</span> ' + ownerDisplay + '</p>';
-    }
-
-    let roleHtml = '';
-    if (node.role) {
-        roleHtml = '<p><span class="opacity-70">' + ((window.t && window.t('map.role')) || 'Role:') + '</span> <span class="badge badge-xs badge-ghost">' + escapeHtml(node.role) + '</span></p>';
-    }
-
     const typeDisplay = getTypeDisplay(node);
     const nodeTypeEmoji = typeEmoji(node.adv_type);
 
@@ -91,27 +78,39 @@ function createPopupContent(node, oidcEnabled) {
         infraIndicatorHtml = ' <span style="display: inline-block; width: 10px; height: 10px; background: ' + dotColor + '; border: 2px solid ' + borderColor + '; border-radius: 50%; vertical-align: middle;" title="' + title + '"></span>';
     }
 
-    const lastSeenLabel = (window.t && window.t('common.last_seen_label')) || 'Last seen:';
-    const lastSeenHtml = node.last_seen
-        ? '<p><span class="opacity-70">' + lastSeenLabel + '</span> ' + node.last_seen.substring(0, 19).replace('T', ' ') + '</p>'
-        : '';
-
     const typeLabel = (window.t && window.t('common.type')) || 'Type:';
     const keyLabel = (window.t && window.t('common.key')) || 'Key:';
     const locationLabel = (window.t && window.t('common.location')) || 'Location:';
+    const lastSeenLabel = (window.t && window.t('common.last_seen_label')) || 'Last seen:';
     const unknownLabel = (window.t && window.t('node_types.unknown')) || 'Unknown';
     const viewDetailsLabel = (window.t && window.t('common.view_details')) || 'View Details';
 
+    let rows = '';
+    rows += '<div class="opacity-70">' + typeLabel + '</div><div>' + escapeHtml(typeDisplay) + '</div>';
+
+    if (node.role) {
+        const roleLabel = (window.t && window.t('map.role')) || 'Role:';
+        rows += '<div class="opacity-70">' + roleLabel + '</div><div><span class="badge badge-xs badge-ghost">' + escapeHtml(node.role) + '</span></div>';
+    }
+
+    if (node.owner) {
+        const ownerLabel = (window.t && window.t('map.owner')) || 'Owner:';
+        const ownerDisplay = node.owner.callsign
+            ? escapeHtml(node.owner.name) + ' (' + escapeHtml(node.owner.callsign) + ')'
+            : escapeHtml(node.owner.name);
+        rows += '<div class="opacity-70">' + ownerLabel + '</div><div>' + ownerDisplay + '</div>';
+    }
+
+    rows += '<div class="opacity-70">' + keyLabel + '</div><div><code class="text-xs">' + escapeHtml(node.public_key.substring(0, 16)) + '...</code></div>';
+    rows += '<div class="opacity-70">' + locationLabel + '</div><div>' + node.lat.toFixed(4) + ', ' + node.lon.toFixed(4) + '</div>';
+
+    if (node.last_seen) {
+        rows += '<div class="opacity-70">' + lastSeenLabel + '</div><div>' + node.last_seen.substring(0, 19).replace('T', ' ') + '</div>';
+    }
+
     return '<div class="p-2">' +
         '<h3 class="font-bold text-lg mb-2">' + nodeTypeEmoji + ' ' + escapeHtml(node.name || unknownLabel) + infraIndicatorHtml + '</h3>' +
-        '<div class="space-y-1 text-sm">' +
-        '<p><span class="opacity-70">' + typeLabel + '</span> ' + escapeHtml(typeDisplay) + '</p>' +
-        roleHtml +
-        ownerHtml +
-        '<p><span class="opacity-70">' + keyLabel + '</span> <code class="text-xs">' + escapeHtml(node.public_key.substring(0, 16)) + '...</code></p>' +
-        '<p><span class="opacity-70">' + locationLabel + '</span> ' + node.lat.toFixed(4) + ', ' + node.lon.toFixed(4) + '</p>' +
-        lastSeenHtml +
-        '</div>' +
+        '<div class="text-sm grid grid-cols-[auto_1fr] gap-x-3 gap-y-0.5">' + rows + '</div>' +
         '<a href="/nodes/' + encodeURIComponent(node.public_key) + '" class="btn btn-outline btn-xs mt-3">' + viewDetailsLabel + '</a>' +
         '</div>';
 }
@@ -182,6 +181,9 @@ export async function render(container, params, router) {
             applyFilters();
         }
 
+        const existingDetails = container.querySelector('details.collapse');
+        const isFilterOpen = existingDetails ? existingDetails.open : false;
+
         litRender(html`
 <div class="flex items-center justify-between mb-6">
     <h1 class="text-3xl font-bold">${t('entities.map')}</h1>
@@ -192,8 +194,12 @@ export async function render(container, params, router) {
     </div>
 </div>
 
-<div class="card shadow mb-6 panel-solid" style="--panel-color: var(--color-neutral)">
-    <div class="card-body py-4">
+<details class="collapse collapse-arrow bg-base-200 border-2 border-base-content/25 rounded-box mb-6"
+         ?open=${isFilterOpen}>
+    <summary class="collapse-title text-sm font-medium cursor-pointer">
+        ${t('common.filters')}
+    </summary>
+    <div class="collapse-content pt-4">
         <div class="flex gap-4 flex-wrap items-end">
             <div class="fieldset">
                 <label class="fieldset-label">${t('common.show')}</label>
@@ -234,7 +240,7 @@ export async function render(container, params, router) {
             <button id="clear-filters" class="btn btn-ghost btn-sm" @click=${clearFiltersHandler}>${t('common.clear_filters')}</button>
         </div>
     </div>
-</div>
+</details>
 
 <div class="card bg-base-100 shadow-xl">
     <div class="card-body p-2">
diff --git a/tests/test_web/test_pages.py b/tests/test_web/test_pages.py
index f0b6fd7..7ab265a 100644
--- a/tests/test_web/test_pages.py
+++ b/tests/test_web/test_pages.py
@@ -313,6 +313,60 @@ def hello():
             assert "<pre>" in pages[0].content_html
             assert "def hello():" in pages[0].content_html
 
+    def test_markdown_nested_unordered_list(self) -> None:
+        """Test that nested unordered lists produce nested <ul> elements."""
+        with tempfile.TemporaryDirectory() as tmpdir:
+            (Path(tmpdir) / "nested.md").write_text("""---
+title: Nested
+---
+
+- Item 1
+    - Sub item A
+    - Sub item B
+        - Deep item
+- Item 2
+""")
+
+            loader = PageLoader(tmpdir)
+            loader.load_pages()
+
+            pages = loader.get_menu_pages()
+            assert len(pages) == 1
+            html = pages[0].content_html
+            assert "<ul>" in html
+            assert "<li>Item 1" in html
+            assert "<li>Sub item A" in html
+            assert "<li>Deep item" in html
+            outer_ul = html.index("<ul>")
+            inner_ul = html.index("<ul>", outer_ul + 1)
+            assert inner_ul > outer_ul
+
+    def test_markdown_nested_ordered_list(self) -> None:
+        """Test that nested ordered lists produce nested <ol> elements."""
+        with tempfile.TemporaryDirectory() as tmpdir:
+            (Path(tmpdir) / "nested-ol.md").write_text("""---
+title: Nested OL
+---
+
+1. First
+    1. Sub first
+    2. Sub second
+2. Second
+""")
+
+            loader = PageLoader(tmpdir)
+            loader.load_pages()
+
+            pages = loader.get_menu_pages()
+            assert len(pages) == 1
+            html = pages[0].content_html
+            assert "<ol>" in html
+            assert "<li>First" in html
+            assert "<li>Sub first" in html
+            outer_ol = html.index("<ol>")
+            inner_ol = html.index("<ol>", outer_ol + 1)
+            assert inner_ol > outer_ol
+
 
 class TestPagesRoute:
     """Tests for the custom pages routes (SPA).