diff --git a/scripts/css_snapshot.py b/scripts/css_snapshot.py
new file mode 100644
index 000000000..ba927775f
--- /dev/null
+++ b/scripts/css_snapshot.py
@@ -0,0 +1,290 @@
+#!/usr/bin/env python3
+"""Computed-style snapshot harness for ``static/style.css``.
+
+``static/style.css`` is a single 51k-line stylesheet whose rendered result
+depends on source order: hundreds of selectors are declared more than once and
+``!important`` is used throughout. Any restructuring - extracting a block into
+its own file, reordering ``<link>`` tags, moving an ``@media`` rule - can
+silently change which declaration wins, and nothing else in the suite would
+notice.
+
+This module captures ``getComputedStyle`` for a fixed inventory of elements
+across pages, viewports, themes and density modes, hashes the result, and
+compares it against a committed baseline. It moves no CSS. It only makes a move
+falsifiable.
+
+Usage::
+
+    python scripts/css_snapshot.py --check            # compare to the baseline
+    python scripts/css_snapshot.py --write-baseline   # re-record it
+    python scripts/css_snapshot.py --dump before.json # raw values, for diffing
+
+With no ``--origin`` the script serves the repository over loopback on an
+ephemeral port for the duration of the run, so it works standalone. Under
+pytest the session static server is reused instead.
+
+To see *which property* moved rather than just which element::
+
+    python scripts/css_snapshot.py --dump after.json
+    git stash && python scripts/css_snapshot.py --dump before.json && git stash pop
+    diff <(python -m json.tool before.json) <(python -m json.tool after.json)
+"""
+import argparse
+import hashlib
+import http.server
+import json
+import os
+import shutil
+import socketserver
+import subprocess
+import sys
+import threading
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+SNAPSHOT_DIR = ROOT / "tests" / "css_snapshot"
+INVENTORY_PATH = SNAPSHOT_DIR / "inventory.json"
+BASELINE_PATH = SNAPSHOT_DIR / "baseline.json"
+CAPTURE_SCRIPT = SNAPSHOT_DIR / "capture.mjs"
+
+# A capture is ~70 page loads; on a warm checkout it runs in well under a
+# minute, but a cold `npx playwright install` machine can be slow to start
+# Chromium the first time.
+CAPTURE_TIMEOUT_SECONDS = 900
+
+# Hash prefix length. 16 hex characters is 64 bits - far past any accidental
+# collision risk for a few thousand entries, and short enough that the baseline
+# stays readable in a diff.
+HASH_LENGTH = 16
+
+
+def load_inventory(path=INVENTORY_PATH):
+    """Load the checked-in element inventory."""
+    return json.loads(Path(path).read_text(encoding="utf-8"))
+
+
+def load_baseline(path=BASELINE_PATH):
+    """Load the committed baseline digest."""
+    return json.loads(Path(path).read_text(encoding="utf-8"))
+
+
+def _canonical(value):
+    return json.dumps(value, sort_keys=True, separators=(",", ":"), ensure_ascii=False)
+
+
+def _hash(value):
+    return hashlib.sha256(_canonical(value).encode("utf-8")).hexdigest()[:HASH_LENGTH]
+
+
+def node_available(node="node"):
+    """True when the node binary is on PATH."""
+    return shutil.which(node) is not None
+
+
+def playwright_available(node="node", cwd=ROOT):
+    """True when node can resolve the playwright package from the repo root.
+
+    Playwright is a devDependency installed by ``npm ci``; a clean checkout
+    that has not run it cannot drive a browser at all.
+    """
+    if not node_available(node):
+        return False
+    result = subprocess.run(
+        [node, "-e", "require.resolve('playwright')"],
+        cwd=str(cwd), capture_output=True, text=True, check=False,
+    )
+    return result.returncode == 0
+
+
+def capture(origin, inventory=None, *, swap_rule=None, variants=None,
+            node="node", cwd=ROOT, timeout=CAPTURE_TIMEOUT_SECONDS):
+    """Drive the browser capture and return ``{"snapshot": ..., "missing": ...}``.
+
+    ``swap_rule`` swaps the first two top-level declarations of one selector
+    before the stylesheet reaches the browser. It exists for the harness
+    self-test: a snapshot that does not move when two conflicting rules trade
+    places is not evidence of anything.
+
+    ``variants`` restricts the run to the named variants, for a faster
+    focused capture.
+    """
+    inventory = inventory or load_inventory()
+    selected = inventory["variants"]
+    if variants:
+        wanted = set(variants)
+        selected = [v for v in selected if v["name"] in wanted]
+        unknown = wanted - {v["name"] for v in inventory["variants"]}
+        if unknown:
+            raise ValueError(f"unknown variants: {sorted(unknown)}")
+    job = {
+        "origin": origin.rstrip("/"),
+        "properties": inventory["properties"],
+        "variants": selected,
+        "pages": inventory["pages"],
+        "swapRule": swap_rule,
+    }
+    result = subprocess.run(
+        [node, str(CAPTURE_SCRIPT)],
+        input=json.dumps(job), cwd=str(cwd),
+        capture_output=True, text=True, check=False, timeout=timeout,
+    )
+    if result.returncode != 0:
+        raise RuntimeError(f"css snapshot capture failed:\n{result.stderr.strip()}")
+    return json.loads(result.stdout)
+
+
+def summarize(snapshot):
+    """Reduce a raw capture to the committed digest shape.
+
+    Two orthogonal projections are stored rather than one hash per
+    (element, variant) pair: hashing every pair would commit ~5,000 lines that
+    nobody reads, while a single global digest would only ever say "something
+    moved". Per-element and per-variant hashes localise a failure from both
+    directions - which element drifted, and in which variant - for a file small
+    enough to review.
+    """
+    elements = {}
+    variants = {}
+    for page, per_variant in snapshot.items():
+        element_values = {}
+        variants[page] = {}
+        for variant, measured in per_variant.items():
+            variants[page][variant] = _hash(measured)
+            for key, values in measured.items():
+                element_values.setdefault(key, {})[variant] = values
+        elements[page] = {key: _hash(values) for key, values in element_values.items()}
+    return {
+        "digest": _hash(snapshot),
+        "elements": elements,
+        "variants": variants,
+    }
+
+
+def compare(baseline, current):
+    """Return the drift between a committed baseline and a fresh summary."""
+    drift = {"digest_changed": baseline.get("digest") != current["digest"],
+             "elements": [], "variants": []}
+    for section in ("elements", "variants"):
+        old = baseline.get(section, {})
+        new = current.get(section, {})
+        for page in sorted(set(old) | set(new)):
+            old_page = old.get(page, {})
+            new_page = new.get(page, {})
+            for key in sorted(set(old_page) | set(new_page)):
+                if old_page.get(key) != new_page.get(key):
+                    drift[section].append(f"{page}/{key}")
+    return drift
+
+
+def serve_repository(root=ROOT):
+    """Serve the repository over loopback on an ephemeral port.
+
+    Mirrors the browser-test static server in ``tests/conftest.py`` so the CLI
+    can run outside pytest. Returns ``(origin, shutdown)``.
+    """
+    root = Path(root).resolve()
+
+    class Handler(http.server.SimpleHTTPRequestHandler):
+        def __init__(self, *args, **kwargs):
+            super().__init__(*args, directory=str(root), **kwargs)
+
+        def log_message(self, fmt, *args):
+            pass
+
+        def guess_type(self, path):
+            if path.endswith(".js") or path.endswith(".mjs"):
+                return "application/javascript"
+            if path.endswith(".css"):
+                return "text/css"
+            return super().guess_type(path)
+
+    class Server(socketserver.TCPServer):
+        allow_reuse_address = True
+
+    server = Server(("127.0.0.1", 0), Handler)
+    thread = threading.Thread(target=server.serve_forever, daemon=True)
+    thread.start()
+
+    def shutdown():
+        server.shutdown()
+        server.server_close()
+
+    return f"http://127.0.0.1:{server.server_address[1]}", shutdown
+
+
+def _describe(drift, limit=25):
+    lines = []
+    for section in ("elements", "variants"):
+        items = drift[section]
+        if not items:
+            continue
+        shown = items[:limit]
+        suffix = f" (+{len(items) - limit} more)" if len(items) > limit else ""
+        lines.append(f"  {section} that moved ({len(items)}): {', '.join(shown)}{suffix}")
+    return "\n".join(lines) or "  (no per-element drift; the digest itself changed)"
+
+
+def main(argv=None):
+    parser = argparse.ArgumentParser(description=__doc__.splitlines()[0])
+    parser.add_argument("--origin", help="static server origin to capture against; "
+                                         "one is started on an ephemeral port when omitted")
+    parser.add_argument("--write-baseline", action="store_true",
+                        help=f"re-record {BASELINE_PATH.relative_to(ROOT)}")
+    parser.add_argument("--check", action="store_true",
+                        help="compare against the committed baseline (default)")
+    parser.add_argument("--dump", metavar="PATH",
+                        help="write the raw computed values, for property-level diffing")
+    parser.add_argument("--swap-rule", metavar="SELECTOR",
+                        help="swap the first two top-level declarations of SELECTOR "
+                             "before capturing (harness self-test)")
+    parser.add_argument("--variants", help="comma-separated variant names to restrict the run to")
+    parser.add_argument("--node", default="node", help="node binary to use")
+    args = parser.parse_args(argv)
+
+    if not playwright_available(args.node):
+        parser.error("node with the playwright package is required; run `npm ci` first")
+
+    variants = [v.strip() for v in args.variants.split(",")] if args.variants else None
+    shutdown = None
+    origin = args.origin or os.environ.get("ODYSSEUS_TEST_STATIC_ORIGIN")
+    if not origin:
+        origin, shutdown = serve_repository()
+    try:
+        captured = capture(origin, swap_rule=args.swap_rule, variants=variants, node=args.node)
+    finally:
+        if shutdown:
+            shutdown()
+
+    if captured["missing"]:
+        print("inventory entries that matched no element:", file=sys.stderr)
+        for scope, keys in sorted(captured["missing"].items()):
+            print(f"  {scope}: {', '.join(keys)}", file=sys.stderr)
+
+    summary = summarize(captured["snapshot"])
+
+    if args.dump:
+        Path(args.dump).write_text(json.dumps(captured["snapshot"], indent=1, sort_keys=True) + "\n",
+                                   encoding="utf-8")
+        print(f"raw values written to {args.dump}")
+
+    if args.write_baseline:
+        if variants or args.swap_rule:
+            parser.error("--write-baseline needs a full, unmutated capture: "
+                         "drop --variants and --swap-rule")
+        BASELINE_PATH.write_text(json.dumps(summary, indent=1, sort_keys=True) + "\n",
+                                 encoding="utf-8")
+        print(f"baseline written: digest {summary['digest']}")
+        return 0
+
+    baseline = load_baseline()
+    drift = compare(baseline, summary)
+    if not drift["digest_changed"] and not drift["elements"] and not drift["variants"]:
+        print(f"computed styles match the baseline (digest {summary['digest']})")
+        return 0
+    print(f"computed styles moved: baseline {baseline.get('digest')} -> {summary['digest']}")
+    print(_describe(drift))
+    return 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/specs/frontend.md b/specs/frontend.md
index 4bd58d490..cd3eea540 100644
--- a/specs/frontend.md
+++ b/specs/frontend.md
@@ -136,6 +136,8 @@ The Settings finder and navigation are registry-backed, hide admin-only destinat
 
 Existing frontend coverage is a mix of Node-executed helper tests, `.mjs` tests, static DOM/CSS/source-shape tests, browser exploration specs, and app/static tests. Many tests are useful source-shape regressions but do not replace browser/module-graph execution.
 
+`tests/test_css_computed_style_snapshot.py` pins `getComputedStyle` for a fixed element inventory across pages, viewports, themes and density modes, so a `static/style.css` restructuring that changes which declaration wins fails a test instead of shipping; see `tests/css_snapshot/README.md` for what it does and does not cover.
+
 Recent focused coverage includes model-key matching under Node, document-library counters, chat resend/delete/mobile Enter/ArrowUp, scoped approval continuation and compare routing, route provenance, live-thinking throttling, startup shell/history hydration, shared app-config caching/invalidation, settings registry/navigation/finder/lifecycle, lazy panel loading/offline editor precache, vendored lazy KaTeX/Mermaid rendering, email read dedup/prewarm, Markdown restoration, malformed keybinds, currency-safe inline math, notes/calendar/modal/manifest/admin-log behavior, Markdown XSS helpers, and CardDAV unchanged-password handling.
 
 Missing coverage includes:
@@ -143,7 +145,7 @@ Missing coverage includes:
 - SPA route/static auth and no-cache headers;
 - CSP header contents and nonce injection for `/` and `/login`;
 - service-worker API/non-GET bypass and cache strategy;
-- service-worker precache versus `index.html` script/module tags, including query strings;
+- service-worker precache versus `index.html` script/module tags, including query strings (stylesheet links and their `?v=` strings are covered by `tests/test_static_stylesheet_manifest.py`; script and module tags are not);
 - ongoing manifest/icon reference drift;
 - module graph/load-order validation;
 - degraded vendor-library/browser API behavior, including Pyodide's remaining CDN path.
@@ -151,8 +153,8 @@ Missing coverage includes:
 ## Current Gaps
 
 - `static/style.css` and large coordinators remain high-risk owners: `static/js/document.js`, `static/js/settings.js`, `static/js/chat.js`, and `static/app.js`.
-- There is no build-time type checking, module graph validation, script-order validation, or service-worker precache validation.
+- There is no build-time type checking, module graph validation, or script-order validation. Service-worker precache validation exists for stylesheets only.
 - Frontend state is mostly module/global/localStorage driven, so cross-session and cross-user behavior needs explicit care.
 - `window.*` compatibility bridges remain widespread.
 - PWA/static-serving behavior may deserve a separate spec if service worker, manifests, route-specific icons, and cache policy keep growing.
-- A static asset/route manifest regression should verify files referenced by `index.html`, `manifest.json`, `sw.js`, and app-owned HTML routes actually exist.
+- The static asset/route manifest regression covers stylesheets referenced by app-owned HTML and `sw.js`; scripts, modules and `manifest.json` icon references are still unverified.
diff --git a/tests/README.md b/tests/README.md
index 83e2c10c2..770cd4c49 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -137,6 +137,25 @@ The runner propagates pytest's exit code, so it composes with normal local
 workflows; "report-only" means it is not a CI gate, not that failures are
 swallowed.
 
+## CSS computed-style snapshot
+
+`tests/test_css_computed_style_snapshot.py` pins the rendered result of
+`static/style.css` - one 51k-line file whose behavior depends on source order -
+by hashing `getComputedStyle` over a fixed element inventory across pages,
+viewports, themes and density modes. Any PR that moves CSS has to produce an
+identical digest or explain why it did not.
+
+```bash
+./venv/bin/python -m pytest tests/test_css_computed_style_snapshot.py
+./venv/bin/python scripts/css_snapshot.py --check            # standalone, no pytest
+./venv/bin/python scripts/css_snapshot.py --write-baseline   # re-record, deliberately
+```
+
+The inventory, the baseline and the capture live in `tests/css_snapshot/`;
+`tests/css_snapshot/README.md` documents what is covered, what is deliberately
+not, and how to find the property that moved when it fails. The run takes about
+21 seconds and skips when `npm ci` has not been run.
+
 ## Core principles
 
 - Keep PRs small and homogeneous: one kind of change per PR.
diff --git a/tests/css_snapshot/README.md b/tests/css_snapshot/README.md
new file mode 100644
index 000000000..c4691dc7c
--- /dev/null
+++ b/tests/css_snapshot/README.md
@@ -0,0 +1,129 @@
+# Computed-style snapshot harness
+
+`static/style.css` is 51,425 lines in one file. Hundreds of selectors are
+declared more than once and `!important` appears throughout, so the rendered
+result is a function of **source order**. Extracting a block into its own file,
+reordering `<link>` tags, or moving an `@media` rule can silently change which
+declaration wins, and nothing else in the suite would notice.
+
+This harness makes that falsifiable. It captures `getComputedStyle` over a
+fixed element inventory, hashes the result, and compares it to a committed
+baseline. It moves no CSS itself.
+
+## What it covers
+
+| Dimension | Values |
+|---|---|
+| Pages | `static/index.html` (app shell, 76 elements), `static/login.html` (14), the bench (586 selectors) |
+| Viewports | 1440x900, 820x1000, 768x1024 (touch), 390x844 (touch) |
+| Themes | dark (default) and `:root.light` |
+| Density | default, `:root.density-compact`, `:root.density-spacious` |
+| Properties | 122 pinned properties per element, plus every custom property on `:root` and `body` |
+
+That is 676 elements x 24 variants = 16,224 element snapshots per run, in
+about 21 seconds.
+
+The **app shell** page measures real elements in the markup the server sends,
+including modals - each one revealed on its own and re-hidden straight after,
+so the measurements stay independent.
+
+The **bench** page measures one synthesised element per selector, built from
+the selector itself. Its selector list is evidence-driven: every selector
+declared **more than once** in `style.css` that can be expressed as a static
+compound chain (551 of them), plus a curated set covering chat, documents,
+email, notes, calendar, settings, cookbook and gallery. Redeclared selectors
+are the ones a reorder can actually flip, so they are the ones worth benching.
+A bench element pins the cascade for that class combination; it does not pin
+the markup that the JS produces.
+
+Selectors the bench grammar cannot express are the gap: selector lists
+(`a, b`), pseudo-elements, pseudo-classes, `:not()` and `:has()`. They are
+skipped rather than approximated.
+
+## Files
+
+| File | Role |
+|---|---|
+| `inventory.json` | The fixed inventory: properties, variants, pages, elements, bench selectors |
+| `baseline.json` | The committed digest plus per-element and per-variant hashes |
+| `capture.mjs` | Playwright capture; raw values on stdout |
+| `bench.html` | Empty page that loads the stylesheet; the capture mounts bench nodes into it |
+| `../test_css_computed_style_snapshot.py` | The regression test |
+| `../../scripts/css_snapshot.py` | Hashing, comparison, and the CLI |
+
+## Running it
+
+```bash
+./venv/bin/python -m pytest tests/test_css_computed_style_snapshot.py
+./venv/bin/python scripts/css_snapshot.py --check          # same comparison, standalone
+./venv/bin/python scripts/css_snapshot.py --write-baseline # re-record
+```
+
+The CLI serves the repository on an ephemeral port itself, so it does not need
+pytest. Under pytest the session static server is reused through
+`ODYSSEUS_TEST_STATIC_ORIGIN`.
+
+`npm ci` is required: the capture drives Playwright's Chromium. Without it the
+browser tests skip.
+
+## When the test fails
+
+The failure names the elements and the variants whose hashes moved. To see
+which *property* moved, capture both sides and diff:
+
+```bash
+./venv/bin/python scripts/css_snapshot.py --dump after.json
+git stash && ./venv/bin/python scripts/css_snapshot.py --dump before.json && git stash pop
+diff <(python -m json.tool before.json) <(python -m json.tool after.json)
+```
+
+Re-record the baseline only when the change in rendered style is **intended**
+and reviewed. On a mechanical CSS extraction it never should be: an extraction
+that preserves order produces an identical digest, and one that does not has
+changed the UI.
+
+## Determinism
+
+The digest is only worth having if an unchanged stylesheet always produces the
+same bytes, so the capture:
+
+- strips every `<script>` from the document, leaving exactly the markup the
+  server sends - no app module can mutate classes underneath the measurement;
+- injects the theme and density classes into `<html>` *before* first paint
+  rather than toggling them afterwards, so no CSS transition is ever
+  mid-interpolation while `getComputedStyle` runs;
+- aborts images, fonts and media, which cost time and change nothing in the
+  pinned property set;
+- hides scrollbars, so a platform's scrollbar width cannot change the width
+  that percentages and `auto` resolve against;
+- pins `prefers-reduced-motion`, `forced-colors`, `prefers-color-scheme` and
+  the device pixel ratio.
+
+## What it does not cover
+
+- **Layout geometry.** `width`, `height`, `top`/`left`/`right`/`bottom`,
+  `transform` and `grid-template-*` resolve to used values that depend on text
+  layout, so they are excluded rather than risk a baseline that only holds on
+  one machine. A reorder that changes a size through a property in the pinned
+  set is still caught; one that changes it only through an excluded property is
+  not.
+- **Pseudo-class states.** `:hover`, `:focus` and `:active` are not driven.
+- **JS-applied classes.** State the app adds at runtime (collapsed sidebar,
+  open panels, active tabs) is not represented beyond what the served markup
+  and the bench selectors already carry.
+- **Cross-platform equality has not been measured.** The baseline was recorded
+  on macOS. The self-hosted Fira Code face means text metrics should not differ
+  from CI's Linux Chromium, and the layout-derived properties are excluded, but
+  until a Linux run confirms it, treat a CI-only drift as a possible harness
+  artifact and diff the dumps before assuming the CSS moved.
+- **The stylesheet is only one of the inputs.** `static/login.html` styles
+  itself from an inline `<style>` block; it is in the inventory so the
+  hand-mirrored token values there are pinned too.
+
+## Adding coverage
+
+Add an entry to `inventory.json` - an `{key, selector}` object under a page's
+`elements` (with `"unhide": true` if it ships hidden, `"custom": true` to
+include custom properties), or a selector string under `bench` - then
+re-record the baseline. `test_baseline_covers_every_inventory_entry` fails if
+the two go out of sync.
diff --git a/tests/css_snapshot/baseline.json b/tests/css_snapshot/baseline.json
new file mode 100644
index 000000000..c2c0c87d7
--- /dev/null
+++ b/tests/css_snapshot/baseline.json
@@ -0,0 +1,767 @@
+{
+ "digest": "e8ef2a81ebd7a4ab",
+ "elements": {
+  "app-shell": {
+   "app-loader": "f04ad5bf6312d53f",
+   "attach-strip": "a6474951e2481214",
+   "body": "58df17f0afa190b9",
+   "chat-container": "b00a7c6be4e107b1",
+   "chat-context-pill": "dd905b87245a9a71",
+   "chat-history": "e65bdc51f4d1675f",
+   "confirm-btn-primary": "c906e0be9fe73bef",
+   "cookbook-modal": "918b17b2e2a311dc",
+   "cookbook-modal-content": "73700bbe8be47774",
+   "custom-preset-modal": "9345624780009d14",
+   "custom-system-prompt": "ef839a436cd42975",
+   "export-dl-btn": "d3fe28e931b66974",
+   "export-dropdown-item": "d90f6f513d06a6f7",
+   "export-dropdown-menu": "0793e06a6aae6a7a",
+   "hamburger-btn": "34714f6eef3734d8",
+   "icon-rail": "e3f72205260a4a5f",
+   "icon-rail-btn": "54ffb10e056ebf44",
+   "incognito-btn": "ee42bd3f6a32576b",
+   "input-icon-btn": "3d1c773acd84a825",
+   "memory-close-btn": "c3f4ba99098a6e4b",
+   "memory-list": "da9a37a3de3c1a31",
+   "memory-modal": "5efc81537eab4526",
+   "memory-modal-content": "3cadc8581361436e",
+   "memory-modal-header": "a8c822fe8c6d20e7",
+   "memory-search-input": "8b0fbb33401750d4",
+   "memory-toolbar-btn": "9f985efa7c896f90",
+   "message-ghost": "ce9144a7705ee903",
+   "message-textarea": "ae703a5c12022f08",
+   "mobile-backdrop": "b2ed3a84835d4916",
+   "mode-toggle-active": "9dfc0fe8866d86c2",
+   "mode-toggle-idle": "4a221dded6bec4d6",
+   "model-picker-btn": "d44aa4f424c3447e",
+   "model-picker-list": "23a89bcc30d0ccee",
+   "model-picker-menu": "f3320494f37c1156",
+   "overflow-menu": "e40a9742168a2a8b",
+   "overflow-menu-item": "1a7cad32047dc976",
+   "pinned-tools-bar": "bb0f88ce29ae7637",
+   "rail-new-chat": "f8f1c2f6be426ab9",
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+   "tablet-dark-comfortable": "f2ddb9a92ac7c0f6",
+   "tablet-dark-compact": "8ef6c7958cabb3ad",
+   "tablet-dark-spacious": "f2ddb9a92ac7c0f6",
+   "tablet-light-comfortable": "2c846ae8e56f881b",
+   "tablet-light-compact": "f4bfea7dbcd7df5f",
+   "tablet-light-spacious": "2c846ae8e56f881b"
+  },
+  "bench": {
+   "desktop-dark-comfortable": "2471a82979dfd8d8",
+   "desktop-dark-compact": "b2807c0c54345c3e",
+   "desktop-dark-spacious": "41a6d588192a02ed",
+   "desktop-light-comfortable": "631778e05aca46ef",
+   "desktop-light-compact": "340c1bbce11d0b32",
+   "desktop-light-spacious": "e21051317e9d346d",
+   "laptop-dark-comfortable": "4c931615f7151fc3",
+   "laptop-dark-compact": "181a9bb9f0add9a0",
+   "laptop-dark-spacious": "ad24cee14e456d04",
+   "laptop-light-comfortable": "d635b3b801ff803d",
+   "laptop-light-compact": "dbe6446fad9cc2f0",
+   "laptop-light-spacious": "c81a4f935d0270a3",
+   "phone-dark-comfortable": "ae0aa5695982a188",
+   "phone-dark-compact": "8ca1949b9817e3c4",
+   "phone-dark-spacious": "912fe8e2d490162f",
+   "phone-light-comfortable": "ccd790243858a150",
+   "phone-light-compact": "2b008b092bec6fb1",
+   "phone-light-spacious": "c2465ac50f71a035",
+   "tablet-dark-comfortable": "1d96addb759bc3e3",
+   "tablet-dark-compact": "53294ba127a61959",
+   "tablet-dark-spacious": "c26663bc163aa446",
+   "tablet-light-comfortable": "b66904a1f69417b7",
+   "tablet-light-compact": "9f0836a37f087c2e",
+   "tablet-light-spacious": "645c09fa0e1ddb59"
+  },
+  "login": {
+   "desktop-dark-comfortable": "d3d0512f5223397e",
+   "desktop-dark-compact": "d3d0512f5223397e",
+   "desktop-dark-spacious": "d3d0512f5223397e",
+   "desktop-light-comfortable": "d3d0512f5223397e",
+   "desktop-light-compact": "d3d0512f5223397e",
+   "desktop-light-spacious": "d3d0512f5223397e",
+   "laptop-dark-comfortable": "d614fc150b017e6e",
+   "laptop-dark-compact": "d614fc150b017e6e",
+   "laptop-dark-spacious": "d614fc150b017e6e",
+   "laptop-light-comfortable": "d614fc150b017e6e",
+   "laptop-light-compact": "d614fc150b017e6e",
+   "laptop-light-spacious": "d614fc150b017e6e",
+   "phone-dark-comfortable": "c7f59e5d8c979f02",
+   "phone-dark-compact": "c7f59e5d8c979f02",
+   "phone-dark-spacious": "c7f59e5d8c979f02",
+   "phone-light-comfortable": "c7f59e5d8c979f02",
+   "phone-light-compact": "c7f59e5d8c979f02",
+   "phone-light-spacious": "c7f59e5d8c979f02",
+   "tablet-dark-comfortable": "ee0918e00caa6875",
+   "tablet-dark-compact": "ee0918e00caa6875",
+   "tablet-dark-spacious": "ee0918e00caa6875",
+   "tablet-light-comfortable": "ee0918e00caa6875",
+   "tablet-light-compact": "ee0918e00caa6875",
+   "tablet-light-spacious": "ee0918e00caa6875"
+  }
+ }
+}
diff --git a/tests/css_snapshot/bench.html b/tests/css_snapshot/bench.html
new file mode 100644
index 000000000..a992f20ff
--- /dev/null
+++ b/tests/css_snapshot/bench.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>CSS snapshot bench</title>
+  <!-- Replaced at capture time by whatever <link rel="stylesheet"> tags
+       static/index.html ships, in shell order, so the bench keeps measuring
+       the real stylesheet set after style.css is split. This fallback is only
+       for opening the page by hand; it is deliberately unversioned so the
+       cache-bust string has one home (tests/test_static_stylesheet_manifest.py
+       pins the shipped ones). -->
+  <link rel="stylesheet" href="/static/style.css">
+</head>
+<body>
+  <!-- Intentionally empty. tests/css_snapshot/capture.mjs mounts one subtree
+       per bench selector from tests/css_snapshot/inventory.json, measures the
+       leaf, and removes it again - so adding coverage is a one-line inventory
+       change and this file never drifts from the selector list. -->
+</body>
+</html>
diff --git a/tests/css_snapshot/capture.mjs b/tests/css_snapshot/capture.mjs
new file mode 100644
index 000000000..ef408b0b5
--- /dev/null
+++ b/tests/css_snapshot/capture.mjs
@@ -0,0 +1,266 @@
+// Computed-style capture for the CSS snapshot harness.
+//
+// Reads a capture job as JSON on stdin, drives headless Chromium over the
+// loopback static server, and writes the raw computed values as JSON on
+// stdout. Hashing, comparison and baseline storage live on the Python side
+// (scripts/css_snapshot.py) so there is exactly one canonicalisation.
+//
+// Determinism rules that matter here, because the digest is only useful if an
+// unchanged stylesheet always produces the same bytes:
+//   - every <script> is stripped from the document, so the DOM stays exactly
+//     what the server sends and no app module can mutate classes underneath us;
+//   - the theme/density classes are injected into the <html> tag *before* the
+//     first paint instead of toggled afterwards, so no CSS transition is ever
+//     mid-interpolation while getComputedStyle runs;
+//   - images, fonts and media are aborted: they cost time and change nothing
+//     in the pinned property set;
+//   - scrollbars are hidden, so a platform's scrollbar width cannot change the
+//     width that percentage and auto values resolve against.
+
+import process from 'node:process';
+
+function readStdin() {
+  return new Promise((resolve, reject) => {
+    let raw = '';
+    process.stdin.setEncoding('utf8');
+    process.stdin.on('data', chunk => { raw += chunk; });
+    process.stdin.on('end', () => resolve(raw));
+    process.stdin.on('error', reject);
+  });
+}
+
+// Swap the first two blocks that declare `selector` at the same nesting level.
+// Used by the harness self-test: if reordering two conflicting declarations of
+// the same selector does not move the digest, the harness is not watching
+// anything worth watching.
+function swapRuleOccurrences(css, selector) {
+  const blocks = [];
+  let depth = 0;
+  let start = 0;
+  for (let i = 0; i < css.length; i += 1) {
+    const ch = css[i];
+    if (ch === '{') {
+      if (depth === 0) {
+        const sel = css.slice(start, i).trim().replace(/\s+/g, ' ');
+        blocks.push({ selector: sel, start, bodyStart: i });
+      }
+      depth += 1;
+    } else if (ch === '}') {
+      depth -= 1;
+      if (depth === 0) {
+        blocks[blocks.length - 1].end = i + 1;
+        start = i + 1;
+      }
+    }
+  }
+  const matches = blocks.filter(b => b.selector === selector && b.end !== undefined);
+  if (matches.length < 2) {
+    throw new Error(`swap-rule: need two top-level blocks for "${selector}", found ${matches.length}`);
+  }
+  const [a, b] = matches;
+  const textA = css.slice(a.start, a.end);
+  const textB = css.slice(b.start, b.end);
+  return css.slice(0, a.start) + textB + css.slice(a.end, b.start) + textA + css.slice(b.end);
+}
+
+// The whole measurement runs inside one page function: Playwright serialises
+// the function source, so anything it calls has to be declared inside it.
+//
+// buildBenchNode is a minimal selector-to-DOM builder for the bench page. It
+// supports descendant and child combinators over compound selectors made of a
+// tag, an id, classes and [attr=value] pairs - which is what the
+// high-redeclaration selectors in style.css are made of. Anything else is
+// reported as missing rather than silently benched as the wrong element.
+function pageMeasure(job) {
+  function buildBenchNode(selector) {
+    const parts = selector.split(/\s*>\s*|\s+/).filter(Boolean);
+    let root = null;
+    let parent = null;
+    let leaf = null;
+    for (const part of parts) {
+      const m = part.match(/^([a-zA-Z][\w-]*)?((?:[#.][\w-]+|\[[^\]]+\])*)$/);
+      if (!m || (!m[1] && !m[2])) throw new Error('unsupported bench selector: ' + selector);
+      const el = document.createElement(m[1] || 'div');
+      const tokens = (m[2] || '').match(/[#.][\w-]+|\[[^\]]+\]/g) || [];
+      for (const token of tokens) {
+        if (token[0] === '#') el.id = token.slice(1);
+        else if (token[0] === '.') el.classList.add(token.slice(1));
+        else {
+          const attr = token.slice(1, -1);
+          const eq = attr.indexOf('=');
+          if (eq === -1) el.setAttribute(attr, '');
+          else el.setAttribute(attr.slice(0, eq), attr.slice(eq + 1).replace(/^["']|["']$/g, ''));
+        }
+      }
+      if (parent) parent.appendChild(el); else root = el;
+      parent = el;
+      leaf = el;
+    }
+    if (!leaf) throw new Error('empty bench selector');
+    return { root, leaf };
+  }
+
+  function readStyle(el, pseudo, properties, wantCustom) {
+    const cs = getComputedStyle(el, pseudo || undefined);
+    const values = {};
+    for (const prop of properties) values[prop] = cs.getPropertyValue(prop);
+    if (wantCustom) {
+      const names = [];
+      for (let i = 0; i < cs.length; i += 1) {
+        const name = cs.item(i);
+        if (name.startsWith('--')) names.push(name);
+      }
+      names.sort();
+      for (const name of names) values[name] = cs.getPropertyValue(name).trim();
+    }
+    return values;
+  }
+
+  // Modals and menus ship hidden in the served markup. Revealing one element
+  // at a time - and putting the class back straight after - keeps each
+  // measurement independent of the others.
+  function reveal(el) {
+    const undo = [];
+    let node = el;
+    while (node && node !== document.documentElement) {
+      if (node.classList && node.classList.contains('hidden')) {
+        const target = node;
+        target.classList.remove('hidden');
+        undo.push(() => target.classList.add('hidden'));
+      }
+      if (node.hasAttribute && node.hasAttribute('hidden')) {
+        const target = node;
+        target.removeAttribute('hidden');
+        undo.push(() => target.setAttribute('hidden', ''));
+      }
+      node = node.parentElement;
+    }
+    return () => { for (const fn of undo.reverse()) fn(); };
+  }
+
+  const measured = {};
+  const missing = [];
+
+  for (const entry of (job.elements || [])) {
+    const el = document.querySelector(entry.selector);
+    if (!el) { missing.push(entry.key); continue; }
+    const restore = entry.unhide ? reveal(el) : null;
+    // Reading a layout property forces the style and layout pass before the
+    // computed values are read back.
+    void document.body.offsetHeight;
+    measured[entry.key] = readStyle(el, entry.pseudo, job.properties, !!entry.custom);
+    if (restore) restore();
+  }
+
+  for (const selector of (job.bench || [])) {
+    let built;
+    try {
+      built = buildBenchNode(selector);
+    } catch (err) {
+      missing.push(selector);
+      continue;
+    }
+    document.body.appendChild(built.root);
+    void document.body.offsetHeight;
+    measured[selector] = readStyle(built.leaf, null, job.properties, false);
+    built.root.remove();
+  }
+
+  return { measured, missing };
+}
+
+// The bench page must load whatever the app shell loads. Once style.css is
+// split, the shell will pull in several ordered stylesheets and a bench that
+// kept linking style.css alone would measure a stylesheet the app no longer
+// serves on its own - and report the extraction as clean when it was not.
+function stylesheetLinks(html) {
+  const links = html.match(/<link\b[^>]*rel=["']stylesheet["'][^>]*>/gi) || [];
+  return links.join('\n  ');
+}
+
+async function main() {
+  const job = JSON.parse(await readStdin());
+  const { chromium } = await import('playwright');
+  const browser = await chromium.launch({ headless: true, args: ['--hide-scrollbars'] });
+  const snapshot = {};
+  const missing = {};
+
+  try {
+    for (const page of job.pages) {
+      snapshot[page.name] = {};
+      let shippedStylesheets = null;
+      if (page.stylesheetsFrom) {
+        const source = await fetch(job.origin + page.stylesheetsFrom);
+        if (!source.ok) throw new Error(`${page.stylesheetsFrom} returned ${source.status}`);
+        shippedStylesheets = stylesheetLinks(await source.text());
+        if (!shippedStylesheets) throw new Error(`no stylesheet links found in ${page.stylesheetsFrom}`);
+      }
+      for (const variant of job.variants) {
+        const context = await browser.newContext({
+          viewport: { width: variant.width, height: variant.height },
+          deviceScaleFactor: 1,
+          colorScheme: variant.colorScheme || 'dark',
+          reducedMotion: 'no-preference',
+          forcedColors: 'none',
+          hasTouch: !!variant.touch,
+          isMobile: false,
+          javaScriptEnabled: true,
+        });
+        const tab = await context.newPage();
+
+        // Registered first so the document/stylesheet handlers below win:
+        // Playwright matches the most recently registered route.
+        await tab.route('**/*', route => {
+          const type = route.request().resourceType();
+          if (type === 'image' || type === 'media' || type === 'font') return route.abort();
+          return route.continue();
+        });
+
+        if (job.swapRule) {
+          await tab.route('**/static/style.css*', async route => {
+            const response = await route.fetch();
+            const body = swapRuleOccurrences(await response.text(), job.swapRule);
+            await route.fulfill({ response, body, headers: { ...response.headers(), 'content-type': 'text/css; charset=utf-8' } });
+          });
+        }
+
+        const documentPath = page.url.split('?')[0];
+        await tab.route(`**${documentPath}`, async route => {
+          const response = await route.fetch();
+          let html = await response.text();
+          html = html.replace(/<script\b[^>]*>[\s\S]*?<\/script>/gi, '');
+          if (shippedStylesheets !== null) {
+            html = html.replace(/<link\b[^>]*rel=["']stylesheet["'][^>]*>/gi, '');
+            html = html.replace(/<\/head>/i, `  ${shippedStylesheets}\n</head>`);
+          }
+          const classes = [variant.theme === 'light' ? 'light' : '', variant.density && variant.density !== 'comfortable' ? `density-${variant.density}` : '']
+            .filter(Boolean).join(' ');
+          html = html.replace(/<html\b([^>]*)>/i, (match, attrs) => `<html${attrs.replace(/\sclass="[^"]*"/i, '')} class="${classes}">`);
+          await route.fulfill({ response, body: html, headers: { ...response.headers(), 'content-type': 'text/html; charset=utf-8' } });
+        });
+
+        const response = await tab.goto(job.origin + page.url, { waitUntil: 'load' });
+        if (!response || !response.ok()) {
+          throw new Error(`${page.url} returned ${response ? response.status() : 'no response'}`);
+        }
+        const result = await tab.evaluate(pageMeasure, {
+          elements: page.elements || [],
+          bench: page.bench || [],
+          properties: job.properties,
+        });
+        snapshot[page.name][variant.name] = result.measured;
+        if (result.missing.length) missing[`${page.name}/${variant.name}`] = result.missing;
+        await context.close();
+      }
+    }
+  } finally {
+    await browser.close();
+  }
+
+  process.stdout.write(JSON.stringify({ snapshot, missing }));
+}
+
+main().catch(err => {
+  process.stderr.write(String(err && err.stack ? err.stack : err) + '\n');
+  process.exit(1);
+});
diff --git a/tests/css_snapshot/inventory.json b/tests/css_snapshot/inventory.json
new file mode 100644
index 000000000..e6553e370
--- /dev/null
+++ b/tests/css_snapshot/inventory.json
@@ -0,0 +1,1349 @@
+{
+ "//": "Fixed inventory for the computed-style snapshot harness. See README.md in this directory.",
+ "properties": [
+  "display",
+  "visibility",
+  "opacity",
+  "position",
+  "float",
+  "clear",
+  "box-sizing",
+  "z-index",
+  "overflow-x",
+  "overflow-y",
+  "min-width",
+  "max-width",
+  "min-height",
+  "max-height",
+  "margin-top",
+  "margin-right",
+  "margin-bottom",
+  "margin-left",
+  "padding-top",
+  "padding-right",
+  "padding-bottom",
+  "padding-left",
+  "border-top-width",
+  "border-right-width",
+  "border-bottom-width",
+  "border-left-width",
+  "border-top-style",
+  "border-right-style",
+  "border-bottom-style",
+  "border-left-style",
+  "border-top-color",
+  "border-right-color",
+  "border-bottom-color",
+  "border-left-color",
+  "border-top-left-radius",
+  "border-top-right-radius",
+  "border-bottom-right-radius",
+  "border-bottom-left-radius",
+  "outline-color",
+  "outline-style",
+  "outline-width",
+  "outline-offset",
+  "box-shadow",
+  "filter",
+  "backdrop-filter",
+  "mix-blend-mode",
+  "isolation",
+  "clip-path",
+  "flex-direction",
+  "flex-wrap",
+  "flex-grow",
+  "flex-shrink",
+  "flex-basis",
+  "order",
+  "align-items",
+  "align-self",
+  "align-content",
+  "justify-content",
+  "justify-items",
+  "justify-self",
+  "row-gap",
+  "column-gap",
+  "grid-auto-flow",
+  "color",
+  "background-color",
+  "background-image",
+  "background-position",
+  "background-size",
+  "background-repeat",
+  "background-clip",
+  "background-origin",
+  "background-attachment",
+  "background-blend-mode",
+  "font-family",
+  "font-size",
+  "font-weight",
+  "font-style",
+  "font-variant-numeric",
+  "font-stretch",
+  "line-height",
+  "letter-spacing",
+  "word-spacing",
+  "text-align",
+  "text-transform",
+  "text-indent",
+  "text-decoration-line",
+  "text-decoration-color",
+  "text-decoration-style",
+  "text-overflow",
+  "text-shadow",
+  "white-space",
+  "word-break",
+  "overflow-wrap",
+  "hyphens",
+  "vertical-align",
+  "writing-mode",
+  "direction",
+  "-webkit-line-clamp",
+  "-webkit-box-orient",
+  "list-style-type",
+  "content",
+  "cursor",
+  "pointer-events",
+  "-webkit-user-select",
+  "touch-action",
+  "appearance",
+  "resize",
+  "caret-color",
+  "accent-color",
+  "transition-property",
+  "transition-duration",
+  "transition-timing-function",
+  "transition-delay",
+  "animation-name",
+  "animation-duration",
+  "animation-timing-function",
+  "animation-delay",
+  "animation-iteration-count",
+  "animation-direction",
+  "animation-fill-mode",
+  "animation-play-state",
+  "will-change"
+ ],
+ "variants": [
+  {
+   "name": "desktop-dark-comfortable",
+   "width": 1440,
+   "height": 900,
+   "touch": false,
+   "theme": "dark",
+   "density": "comfortable",
+   "colorScheme": "dark"
+  },
+  {
+   "name": "desktop-dark-compact",
+   "width": 1440,
+   "height": 900,
+   "touch": false,
+   "theme": "dark",
+   "density": "compact",
+   "colorScheme": "dark"
+  },
+  {
+   "name": "desktop-dark-spacious",
+   "width": 1440,
+   "height": 900,
+   "touch": false,
+   "theme": "dark",
+   "density": "spacious",
+   "colorScheme": "dark"
+  },
+  {
+   "name": "desktop-light-comfortable",
+   "width": 1440,
+   "height": 900,
+   "touch": false,
+   "theme": "light",
+   "density": "comfortable",
+   "colorScheme": "light"
+  },
+  {
+   "name": "desktop-light-compact",
+   "width": 1440,
+   "height": 900,
+   "touch": false,
+   "theme": "light",
+   "density": "compact",
+   "colorScheme": "light"
+  },
+  {
+   "name": "desktop-light-spacious",
+   "width": 1440,
+   "height": 900,
+   "touch": false,
+   "theme": "light",
+   "density": "spacious",
+   "colorScheme": "light"
+  },
+  {
+   "name": "laptop-dark-comfortable",
+   "width": 820,
+   "height": 1000,
+   "touch": false,
+   "theme": "dark",
+   "density": "comfortable",
+   "colorScheme": "dark"
+  },
+  {
+   "name": "laptop-dark-compact",
+   "width": 820,
+   "height": 1000,
+   "touch": false,
+   "theme": "dark",
+   "density": "compact",
+   "colorScheme": "dark"
+  },
+  {
+   "name": "laptop-dark-spacious",
+   "width": 820,
+   "height": 1000,
+   "touch": false,
+   "theme": "dark",
+   "density": "spacious",
+   "colorScheme": "dark"
+  },
+  {
+   "name": "laptop-light-comfortable",
+   "width": 820,
+   "height": 1000,
+   "touch": false,
+   "theme": "light",
+   "density": "comfortable",
+   "colorScheme": "light"
+  },
+  {
+   "name": "laptop-light-compact",
+   "width": 820,
+   "height": 1000,
+   "touch": false,
+   "theme": "light",
+   "density": "compact",
+   "colorScheme": "light"
+  },
+  {
+   "name": "laptop-light-spacious",
+   "width": 820,
+   "height": 1000,
+   "touch": false,
+   "theme": "light",
+   "density": "spacious",
+   "colorScheme": "light"
+  },
+  {
+   "name": "tablet-dark-comfortable",
+   "width": 768,
+   "height": 1024,
+   "touch": true,
+   "theme": "dark",
+   "density": "comfortable",
+   "colorScheme": "dark"
+  },
+  {
+   "name": "tablet-dark-compact",
+   "width": 768,
+   "height": 1024,
+   "touch": true,
+   "theme": "dark",
+   "density": "compact",
+   "colorScheme": "dark"
+  },
+  {
+   "name": "tablet-dark-spacious",
+   "width": 768,
+   "height": 1024,
+   "touch": true,
+   "theme": "dark",
+   "density": "spacious",
+   "colorScheme": "dark"
+  },
+  {
+   "name": "tablet-light-comfortable",
+   "width": 768,
+   "height": 1024,
+   "touch": true,
+   "theme": "light",
+   "density": "comfortable",
+   "colorScheme": "light"
+  },
+  {
+   "name": "tablet-light-compact",
+   "width": 768,
+   "height": 1024,
+   "touch": true,
+   "theme": "light",
+   "density": "compact",
+   "colorScheme": "light"
+  },
+  {
+   "name": "tablet-light-spacious",
+   "width": 768,
+   "height": 1024,
+   "touch": true,
+   "theme": "light",
+   "density": "spacious",
+   "colorScheme": "light"
+  },
+  {
+   "name": "phone-dark-comfortable",
+   "width": 390,
+   "height": 844,
+   "touch": true,
+   "theme": "dark",
+   "density": "comfortable",
+   "colorScheme": "dark"
+  },
+  {
+   "name": "phone-dark-compact",
+   "width": 390,
+   "height": 844,
+   "touch": true,
+   "theme": "dark",
+   "density": "compact",
+   "colorScheme": "dark"
+  },
+  {
+   "name": "phone-dark-spacious",
+   "width": 390,
+   "height": 844,
+   "touch": true,
+   "theme": "dark",
+   "density": "spacious",
+   "colorScheme": "dark"
+  },
+  {
+   "name": "phone-light-comfortable",
+   "width": 390,
+   "height": 844,
+   "touch": true,
+   "theme": "light",
+   "density": "comfortable",
+   "colorScheme": "light"
+  },
+  {
+   "name": "phone-light-compact",
+   "width": 390,
+   "height": 844,
+   "touch": true,
+   "theme": "light",
+   "density": "compact",
+   "colorScheme": "light"
+  },
+  {
+   "name": "phone-light-spacious",
+   "width": 390,
+   "height": 844,
+   "touch": true,
+   "theme": "light",
+   "density": "spacious",
+   "colorScheme": "light"
+  }
+ ],
+ "pages": [
+  {
+   "name": "app-shell",
+   "url": "/static/index.html",
+   "elements": [
+    {
+     "key": "root",
+     "selector": "html",
+     "custom": true
+    },
+    {
+     "key": "body",
+     "selector": "body",
+     "custom": true
+    },
+    {
+     "key": "sidebar",
+     "selector": "#sidebar"
+    },
+    {
+     "key": "sidebar-brand",
+     "selector": "#sidebar-brand-btn"
+    },
+    {
+     "key": "sidebar-new-chat",
+     "selector": "#sidebar-new-chat-btn"
+    },
+    {
+     "key": "sidebar-section",
+     "selector": "#sessions-section"
+    },
+    {
+     "key": "sidebar-section-header-btn",
+     "selector": "#chats-library-btn"
+    },
+    {
+     "key": "session-list-bootstrap",
+     "selector": "#session-list-loading"
+    },
+    {
+     "key": "sidebar-user-bar",
+     "selector": "#sidebar-user-bar"
+    },
+    {
+     "key": "user-bar-avatar",
+     "selector": "#user-bar-avatar"
+    },
+    {
+     "key": "user-bar-settings",
+     "selector": "#user-bar-settings"
+    },
+    {
+     "key": "sidebar-resize-handle",
+     "selector": "#sidebar-resize-handle"
+    },
+    {
+     "key": "icon-rail",
+     "selector": "#icon-rail"
+    },
+    {
+     "key": "icon-rail-btn",
+     "selector": "#rail-settings"
+    },
+    {
+     "key": "rail-new-chat",
+     "selector": "#rail-new-session"
+    },
+    {
+     "key": "hamburger-btn",
+     "selector": "#hamburger-btn"
+    },
+    {
+     "key": "mobile-backdrop",
+     "selector": "#mobile-backdrop"
+    },
+    {
+     "key": "chat-container",
+     "selector": "#chat-container"
+    },
+    {
+     "key": "chat-history",
+     "selector": "#chat-history"
+    },
+    {
+     "key": "welcome-screen",
+     "selector": "#welcome-screen"
+    },
+    {
+     "key": "welcome-sub",
+     "selector": "#welcome-sub"
+    },
+    {
+     "key": "welcome-tip",
+     "selector": "#welcome-tip"
+    },
+    {
+     "key": "incognito-btn",
+     "selector": "#incognito-btn"
+    },
+    {
+     "key": "chat-context-pill",
+     "selector": "#chat-context-pill"
+    },
+    {
+     "key": "export-dl-btn",
+     "selector": "#export-dl-btn"
+    },
+    {
+     "key": "export-dropdown-menu",
+     "selector": "#export-dropdown-menu"
+    },
+    {
+     "key": "export-dropdown-item",
+     "selector": "#export-compact-btn"
+    },
+    {
+     "key": "scroll-bottom-btn",
+     "selector": "#scroll-bottom-btn"
+    },
+    {
+     "key": "message-textarea",
+     "selector": "#message"
+    },
+    {
+     "key": "message-ghost",
+     "selector": "#message-ghost"
+    },
+    {
+     "key": "attach-strip",
+     "selector": "#attach-strip"
+    },
+    {
+     "key": "model-picker-btn",
+     "selector": "#model-picker-btn"
+    },
+    {
+     "key": "model-picker-menu",
+     "selector": "#model-picker-menu",
+     "unhide": true
+    },
+    {
+     "key": "model-picker-list",
+     "selector": "#model-picker-list"
+    },
+    {
+     "key": "mode-toggle-active",
+     "selector": "#mode-agent-btn"
+    },
+    {
+     "key": "mode-toggle-idle",
+     "selector": "#mode-chat-btn"
+    },
+    {
+     "key": "input-icon-btn",
+     "selector": "#web-toggle-btn"
+    },
+    {
+     "key": "tool-indicator",
+     "selector": "#rag-indicator-btn"
+    },
+    {
+     "key": "overflow-menu",
+     "selector": "#overflow-menu",
+     "unhide": true
+    },
+    {
+     "key": "overflow-menu-item",
+     "selector": "#overflow-attach-btn"
+    },
+    {
+     "key": "reasoning-effort-btn",
+     "selector": "#reasoning-effort-btn"
+    },
+    {
+     "key": "pinned-tools-bar",
+     "selector": "#pinned-tools-bar"
+    },
+    {
+     "key": "toast",
+     "selector": "#toast"
+    },
+    {
+     "key": "search-overlay",
+     "selector": "#search-overlay",
+     "unhide": true
+    },
+    {
+     "key": "search-input",
+     "selector": "#search-input"
+    },
+    {
+     "key": "memory-modal",
+     "selector": "#memory-modal",
+     "unhide": true
+    },
+    {
+     "key": "memory-modal-content",
+     "selector": "#memory-modal .modal-content",
+     "unhide": true
+    },
+    {
+     "key": "memory-modal-header",
+     "selector": "#memory-modal .modal-header",
+     "unhide": true
+    },
+    {
+     "key": "memory-close-btn",
+     "selector": "#close-memory-modal",
+     "unhide": true
+    },
+    {
+     "key": "memory-toolbar-btn",
+     "selector": "#memory-tidy-btn",
+     "unhide": true
+    },
+    {
+     "key": "memory-search-input",
+     "selector": "#memory-search",
+     "unhide": true
+    },
+    {
+     "key": "memory-list",
+     "selector": "#memory-list",
+     "unhide": true
+    },
+    {
+     "key": "theme-modal",
+     "selector": "#theme-modal",
+     "unhide": true
+    },
+    {
+     "key": "theme-popup",
+     "selector": "#theme-popup",
+     "unhide": true
+    },
+    {
+     "key": "theme-tabs",
+     "selector": "#theme-tabs",
+     "unhide": true
+    },
+    {
+     "key": "theme-grid",
+     "selector": "#themeGrid",
+     "unhide": true
+    },
+    {
+     "key": "theme-io-btn",
+     "selector": "#theme-import-btn",
+     "unhide": true
+    },
+    {
+     "key": "settings-modal",
+     "selector": "#settings-modal",
+     "unhide": true
+    },
+    {
+     "key": "settings-nav-search",
+     "selector": "#settings-nav-search",
+     "unhide": true
+    },
+    {
+     "key": "settings-sidebar-toggle",
+     "selector": "#settings-sidebar-toggle",
+     "unhide": true
+    },
+    {
+     "key": "settings-select",
+     "selector": "#set-defaultEpSelect",
+     "unhide": true
+    },
+    {
+     "key": "settings-row",
+     "selector": "#set-searchUrlRow",
+     "unhide": true
+    },
+    {
+     "key": "settings-admin-card",
+     "selector": "#settings-2fa-card",
+     "unhide": true
+    },
+    {
+     "key": "settings-btn-add",
+     "selector": "#adm-addBtn",
+     "unhide": true
+    },
+    {
+     "key": "settings-btn-sm",
+     "selector": "#set-ttsPreviewBtn",
+     "unhide": true
+    },
+    {
+     "key": "settings-logs-tab",
+     "selector": "#system-log-terminal-tab",
+     "unhide": true
+    },
+    {
+     "key": "settings-fallbacks",
+     "selector": "#set-utilityFallbacks",
+     "unhide": true
+    },
+    {
+     "key": "cookbook-modal",
+     "selector": "#cookbook-modal",
+     "unhide": true
+    },
+    {
+     "key": "cookbook-modal-content",
+     "selector": "#cookbook-modal .modal-content",
+     "unhide": true
+    },
+    {
+     "key": "custom-preset-modal",
+     "selector": "#custom-preset-modal",
+     "unhide": true
+    },
+    {
+     "key": "custom-system-prompt",
+     "selector": "#custom-system-prompt",
+     "unhide": true
+    },
+    {
+     "key": "save-custom-preset",
+     "selector": "#save-custom-preset",
+     "unhide": true
+    },
+    {
+     "key": "rename-session-modal",
+     "selector": "#rename-session-modal",
+     "unhide": true
+    },
+    {
+     "key": "session-name-input",
+     "selector": "#session-name-input",
+     "unhide": true
+    },
+    {
+     "key": "confirm-btn-primary",
+     "selector": "#add-skill-btn",
+     "unhide": true
+    },
+    {
+     "key": "app-loader",
+     "selector": "#app-loader"
+    }
+   ]
+  },
+  {
+   "name": "login",
+   "url": "/static/login.html",
+   "elements": [
+    {
+     "key": "root",
+     "selector": "html",
+     "custom": true
+    },
+    {
+     "key": "body",
+     "selector": "body",
+     "custom": true
+    },
+    {
+     "key": "card",
+     "selector": ".card"
+    },
+    {
+     "key": "logo",
+     "selector": ".logo"
+    },
+    {
+     "key": "username",
+     "selector": "#username"
+    },
+    {
+     "key": "password",
+     "selector": "#password"
+    },
+    {
+     "key": "pw-toggle",
+     "selector": "#pwToggle"
+    },
+    {
+     "key": "submit",
+     "selector": "#submitBtn"
+    },
+    {
+     "key": "error",
+     "selector": "#error"
+    },
+    {
+     "key": "remember-toggle",
+     "selector": "#rememberToggle"
+    },
+    {
+     "key": "remember-dot",
+     "selector": ".remember-dot"
+    },
+    {
+     "key": "setup-note",
+     "selector": "#setupNote"
+    },
+    {
+     "key": "version-label",
+     "selector": "#version-label"
+    },
+    {
+     "key": "toggle-link",
+     "selector": "#toggleLink"
+    }
+   ]
+  },
+  {
+   "name": "bench",
+   "url": "/tests/css_snapshot/bench.html",
+   "bench": [
+    "#welcome-screen",
+    ".incognito-btn",
+    ".settings-sidebar",
+    ".note-card",
+    ".chat-meta-overlay",
+    "#welcome-screen .welcome-name",
+    "#welcome-screen .welcome-sub",
+    "#recording-indicator",
+    ".recording-text",
+    ".cal-filters",
+    ".gallery-tab",
+    ".email-field input",
+    ".email-reader-meta > .email-reader-actions-inline",
+    "#cookbook-modal .modal-content",
+    "#export-compact-btn",
+    ".sidebar-inner",
+    "#welcome-screen .welcome-tip",
+    ".msg",
+    ".msg-user",
+    ".msg .body",
+    ".chat-input-bar",
+    ".attach-strip",
+    "pre .copy-code",
+    "pre .edit-code",
+    "pre .run-code",
+    "#email-lib-modal .doclib-grid",
+    ".doclib-card-action-btn",
+    ".session-skeleton-line",
+    ".styled-confirm-box",
+    ".preset-btn",
+    ".preset-btn.active",
+    ".compare-add-flap",
+    ".md-view-toggle",
+    ".md-view-toggle .md-view-opt",
+    ".md-view-toggle .md-view-opt.active",
+    ".doclib-lang-chips",
+    "#email-lib-compose-btn",
+    "#email-lib-modal .modal-content",
+    ".doclib-chat-row.doclib-card-expanded",
+    ".hwfit-cached-item .hwfit-serve-panel",
+    ".cookbook-gpu-btn",
+    ".cookbook-task-check",
+    ".hwfit-serve-row-core .hwfit-context-label",
+    ".cookbook-task-menu-btn",
+    ".cookbook-task-header",
+    ".cookbook-tab",
+    ".settings-layout",
+    ".settings-nav-item",
+    ".ge-topbar",
+    ".ge-alpha-badge",
+    ".ge-tool-btn",
+    ".ge-right-panel",
+    ".ge-transform-popup-head .ge-adj-title",
+    ".ge-transform-field",
+    ".ge-transform-spin",
+    ".ge-transform-field > input.ge-transform-popup-input",
+    ".recipient-chip",
+    ".doc-email-collapse-btn",
+    ".note-card-image",
+    ".cal-toolbar-nav",
+    ".settings-sidebar-content",
+    "body",
+    ".red-text",
+    ".pdf-export-overlay .modal-content",
+    ".chat-top-bar",
+    ".incognito-indicator",
+    ".chat-meta-overlay #current-meta",
+    ".export-dl-btn",
+    ".export-dropdown-menu",
+    ".export-dropdown-item",
+    ".export-dropdown-item .dropdown-icon",
+    ".sidebar",
+    ".sidebar.right-side",
+    ".sidebar.hidden",
+    ".sidebar-header",
+    ".sidebar-brand-title",
+    "#sessions-section",
+    "#sessions-section #session-list",
+    ".hamburger-btn",
+    ".mobile-new-chat-btn",
+    ".icon-rail",
+    ".minimized-dock-chip",
+    ".minimized-dock-chip svg",
+    ".section",
+    ".section-header-flex",
+    ".sidebar-notif-dot",
+    "#email-unread-dot.sidebar-notif-dot",
+    ".section-header-btn",
+    "#session-sort-btn",
+    "#sessions-section .chats-manage-btn",
+    ".session-bulk-bar",
+    "#session-select-all-dot",
+    ".session-bulk-btn",
+    ".item-drag-handle",
+    ".chat-container",
+    "#welcome-screen .welcome-version",
+    ".chat-container.welcome-active .chat-input-bar",
+    ".msg-ai",
+    ".msg .role",
+    "pre",
+    ".reasoning-effort-prefix",
+    ".input-icon-btn",
+    ".send-btn",
+    ".send-btn.anim-launch svg",
+    ".mode-toggle",
+    "#mode-agent-btn",
+    "#mode-chat-btn",
+    ".mode-toggle-btn",
+    ".mode-toggle.mode-toggle-three [data-llama-mode=\"unified\"] > span",
+    ".model-picker-list .model-switch-item",
+    ".model-picker-list .mp-fav-dot",
+    ".msg-action-btn[data-action=\"shorten\"]",
+    ".toast",
+    ".toast-action-hint",
+    ".models-row",
+    ".scroll-nav-btn",
+    "#sidebar-backdrop",
+    ".dropdown-item-compact",
+    ".dropdown-item-compact .dropdown-icon",
+    ".dropdown-item-compact .dropdown-icon svg",
+    ".diff-toolbar",
+    ".diff-toolbar-btn",
+    ".diff-chunk-btn",
+    "#memory-modal .doclib-card.skill-card.doclib-card-expanded > .doclib-card-preview",
+    "#email-lib-modal .admin-card",
+    "#email-lib-modal .email-reader-header",
+    "#email-lib-modal .email-reader-atts",
+    ".doclib-card-header",
+    ".doclib-card-expanded-actions",
+    ".doc-suggestion-nav-btn",
+    ".doc-suggestion-close",
+    ".spinner",
+    ".btn-spinner",
+    ".loading-indicator",
+    ".loading-dots",
+    ".loading-dot",
+    ".session-loading-state",
+    ".session-skeleton-bubble",
+    ".session-skeleton-bubble.is-user",
+    ".modal",
+    ".modal-content",
+    ".modal-header",
+    "#cookbook-modal .modal-header",
+    ".minimize-btn",
+    "#modal-dock",
+    "#styled-confirm-overlay",
+    ".styled-confirm-box .modal-body p",
+    ".styled-confirm-box .modal-footer",
+    ".confirm-btn",
+    ".styled-prompt-box",
+    ".styled-prompt-input",
+    ".hamburger",
+    ".hamburger span",
+    "#agent-indicator",
+    "#agent-indicator.active",
+    "#compare-model-overlay .modal-content",
+    "#compare-model-overlay .modal-body",
+    ".dropdown-divider",
+    "#recording-indicator.hidden",
+    ".recording-content",
+    ".recording-icon",
+    "#stop-recording",
+    "#recording-indicator.error",
+    ".recording-error",
+    ".hljs",
+    ".search-result-snippet",
+    "#theme-popup",
+    "#theme-tab-customize .theme-custom",
+    "#theme-tab-customize .color-row",
+    ".modal-content.modal-closing",
+    ".compare-probe-card",
+    ".compare-probe-list",
+    ".compare-probe-detail",
+    ".compare-probe-detail-message",
+    ".compare-grid",
+    ".compare-mobile-tabs",
+    ".compare-grid.sequential-layout .compare-pane .pane-header",
+    ".compare-pane .pane-header",
+    ".compare-add-flap span",
+    ".compare-mode-tabs",
+    ".compare-toggle-label",
+    "details",
+    ".session-menu-btn",
+    ".list-item .hamburger",
+    "#message",
+    ".attach-image-preview",
+    ".thumb.thumb-image .thumb-img",
+    ".thumb-collapsed",
+    ".thumb button",
+    ".stop-recording-btn",
+    ".agent-thread",
+    ".agent-thread-dot",
+    ".agent-thread-header",
+    ".agent-thread-content",
+    ".agent-thread-cmd",
+    ".private-browser-preview-frame img",
+    ".agent-tool-output pre",
+    ".agent-tool-diff summary",
+    "details a",
+    ".memory-tab-panel[data-memory-panel=\"skills\"]",
+    ".memory-toolbar",
+    "#gallery-editor-drafts-bulk",
+    ".memory-menu-btn",
+    ".memory-item-actions",
+    ".memory-item-actions .memory-item-btn",
+    ".email-filter-picker",
+    ".email-filter-btn",
+    ".email-filter-menu",
+    ".doc-tab-bar",
+    ".doc-tab",
+    ".doc-tab-lang",
+    ".doc-tab-close",
+    ".doc-mobile-footer",
+    ".doc-tab-new",
+    ".doc-editor-header",
+    ".doc-language-select",
+    ".doc-action-icon-btn",
+    ".doc-overflow-item",
+    ".email-send-btn",
+    "#doc-actions-footer #doc-footer-copy-btn",
+    "#doc-actions-footer",
+    "#doc-actions-footer #doc-copy-export-split",
+    ".doc-md-toolbar",
+    ".doc-md-toolbar button",
+    ".md-toolbar-sep",
+    ".md-toolbar-items #doc-pdf-add-text-btn",
+    ".md-scroll-arrow svg",
+    ".doc-outline-menu",
+    ".doc-outline-item",
+    ".doc-rich-selection-toolbar",
+    ".doc-rich-selection-toolbar button",
+    ".doc-rich-selection-toolbar .doc-rich-selection-close",
+    ".doc-rich-slash-menu",
+    ".doc-rich-slash-item",
+    ".doc-line-numbers",
+    ".doc-email-richbody.doc-font-m",
+    ".doc-selection-clear",
+    ".doc-suggestion-card",
+    ".doc-version-panel",
+    ".doc-preview-hover-edit",
+    ".doc-docx-preview",
+    ".doc-docx-paper",
+    ".admin-model-form-row input",
+    ".doclib-toolbar",
+    "#email-lib-modal .email-lib-fab.fab-revealed",
+    ".archive-list",
+    ".archive-menu-btn",
+    "#cookbook-modal .hwfit-cached-list.cookbook-serve-models-just-loaded > .doclib-card",
+    "#cookbook-modal .cookbook-body",
+    ".doclib-card-preview",
+    ".doclib-btn-hint",
+    ".doclib-chat-row.doclib-card-expanded .doclib-chat-preview",
+    ".doclib-chat-row.doclib-card-expanded .doclib-chat-preview-messages",
+    ".cookbook-serve-title",
+    ".doclib-card.doclib-card-expanded",
+    ".skill-card > .skill-card-header",
+    ".skill-card-textcol",
+    ".skill-card-tags",
+    ".doclib-chip-scroll-arrow",
+    "#hwfit-cache-select",
+    ".skill-kebab-btn",
+    ".skill-card.doclib-card-expanded",
+    ".gallery-toolbar",
+    ".gallery-toolbar-break",
+    ".gallery-search-wrap",
+    ".gallery-search",
+    ".gallery-search-enter-hint",
+    ".gallery-chip",
+    ".gallery-album-chips",
+    ".gallery-dl-btn",
+    ".gallery-grid",
+    ".attach-ocr-btn",
+    ".attach-ocr-btn svg",
+    ".gallery-select-btn",
+    ".gallery-detail-title",
+    ".gallery-detail-body",
+    ".gallery-detail-image",
+    ".gallery-detail-nav",
+    ".gallery-detail-sidebar",
+    ".gallery-detail-meta-grid",
+    ".gallery-tabs",
+    ".gallery-albums-grid",
+    ".cookbook-serve-preset-name",
+    ".cookbook-serve-preset-meta",
+    ".cookbook-body",
+    ".cookbook-card-title",
+    ".cookbook-card-desc",
+    ".cookbook-field-label",
+    ".cookbook-field-input",
+    ".cookbook-cmd-preview",
+    ".cookbook-btn",
+    ".cookbook-run-btn",
+    ".cookbook-output-pre",
+    ".cookbook-tab-error-dot",
+    ".cookbook-gpu-btn.active",
+    ".cookbook-section-header .cookbook-clear-btn",
+    ".cookbook-saved-host",
+    ".cookbook-saved-name",
+    ".hwfit-serve-row .cookbook-serve-slots",
+    ".cookbook-slot-btn",
+    ".cookbook-dep-row",
+    ".cookbook-settings-stack",
+    ".cookbook-dep-tag",
+    ".cookbook-dep-build-deps",
+    ".hwfit-help-chip",
+    ".hwfit-serve-topline",
+    ".hwfit-serve-topline .hwfit-serve-runtime-note",
+    ".hwfit-serve-topline .hwfit-serve-runtime-text",
+    ".hwfit-serve-preset-row",
+    ".hwfit-context-control",
+    ".hwfit-context-control .hwfit-sf[data-field=\"ctx\"]",
+    ".hwfit-context-calc-btn",
+    ".hwfit-ctx-control",
+    ".hwfit-ctx-control span",
+    ".hwfit-ctx-control input[type=\"range\"]",
+    ".hwfit-ctx-control output",
+    ".hwfit-spec-group .hwfit-spec-method",
+    ".hwfit-numstep",
+    ".hwfit-serve-cmd-details[open] > .hwfit-serve-cmd-summary",
+    ".cookbook-task-name",
+    ".cookbook-task-wave",
+    ".cookbook-task-sub",
+    ".cookbook-task-status",
+    "#cookbook-server-add.cal-add-btn-text",
+    ".cookbook-official-filter",
+    ".cookbook-section-title",
+    ".cookbook-settings-label",
+    ".cookbook-settings-hint",
+    ".cookbook-settings-input",
+    ".cookbook-dl-repo",
+    ".cookbook-dl-btn",
+    ".cookbook-checkbox-label",
+    ".cookbook-server-row .cookbook-srv-color-wrap.has-color .cookbook-srv-color-dot",
+    ".hwfit-hw-chip-toggle",
+    ".hwfit-panel-fields",
+    ".hwfit-panel-fields input[type=\"text\"]",
+    ".hwfit-preset-model",
+    ".settings-sidebar-divider",
+    ".settings-panels",
+    "#cookbook-modal .modal-content.cookbook-modal-entering",
+    ".task-log-name",
+    ".task-card .memory-item-actions",
+    ".hwfit-cached-menu-btn svg",
+    ".research-synapse .rs-meta",
+    ".research-synapse .rs-meta .rs-status",
+    ".gallery-editor-landing",
+    ".gallery-editor-landing-actions",
+    ".gallery-editor-landing-actions .gallery-select-btn",
+    ".gallery-editor-template-picker",
+    ".gallery-editor-template-options",
+    ".gallery-editor-drafts",
+    ".gallery-editor-drafts-header",
+    ".gallery-editor-drafts-title",
+    ".gallery-editor-drafts-search",
+    "#gallery-editor-drafts-select",
+    ".gallery-editor-draft-delete",
+    ".ge-editor-body",
+    ".ge-layer-action-flash",
+    ".ge-toolbar",
+    ".ge-tool-sep",
+    ".ge-canvas-area",
+    ".ge-main-canvas",
+    ".ge-ai-command-collapsed",
+    ".ge-shortcuts-grid",
+    ".ge-controls",
+    ".ge-layer-geometry-grid",
+    ".ge-transform-popup-head .ge-head-btns",
+    ".ge-transform-popup-head .ge-adj-icon",
+    ".ge-transform-popup-body",
+    ".ge-transform-popup-hint",
+    ".ge-transform-spin button",
+    ".ge-transform-popup-suffix",
+    ".ge-transform-quick-btn",
+    ".ge-inpaint-popup",
+    ".ge-inpaint-popup-input",
+    ".ge-clone-hint-mobile",
+    ".ge-section-help",
+    ".ge-fx-menu",
+    ".ge-adj-popup",
+    ".ge-adj-icon",
+    ".ge-adj-title",
+    "#ge-history-panel",
+    ".ge-gradient-color-row",
+    ".ge-adj-row",
+    ".ge-adj-row > label",
+    ".ge-adj-row input[type=\"range\"]",
+    ".ge-mask-sub-item",
+    ".ge-edge-menu",
+    ".ge-export-overlay",
+    ".ge-export-dialog",
+    ".ge-export-body",
+    ".ge-export-preview-wrap",
+    ".ge-export-preview",
+    ".ge-canvas-prompt",
+    ".ge-canvas-prompt-footer",
+    ".ge-slider-bubble",
+    ".ge-layers-header",
+    ".ge-layers-grab",
+    ".ge-layers-list",
+    ".ge-layer-group-row .ge-layer-group-drag",
+    ".ge-layer-group-row .ge-layer-group-toggle",
+    ".ge-layer-group-row .ge-layer-vis",
+    ".ge-layer-group-row .ge-group-inline-thumb",
+    ".ge-layer-group-row .ge-layer-group-name",
+    ".ge-layer-group-row .ge-layer-lock-btn",
+    ".ge-layer-group-row .ge-layer-opacity-row",
+    ".ge-layer-group-row .ge-layer-controls",
+    ".ge-layer-drag",
+    ".ge-layer-lock-menu",
+    ".ge-layer-lock-option",
+    ".ge-transform-spin button[data-spin=\"down\"]",
+    ".ge-transform-spin button[data-spin=\"up\"]",
+    ".doc-email-header",
+    ".email-field",
+    ".email-field label",
+    ".email-draft-btn",
+    ".doclib-card.email-card-removing",
+    ".email-card-unread-dot",
+    ".email-reader-header",
+    ".email-reader-header > .email-reader-actions",
+    ".email-reader-meta",
+    ".email-reader-meta .recipient-chips",
+    ".email-reader-meta-row strong",
+    ".recipient-chips",
+    ".email-reader-body .email-inline-image-placeholder",
+    ".email-inline-image-skeleton",
+    ".email-inline-image-actions",
+    ".email-quote-fold .email-fold-summary",
+    ".email-bubble",
+    ".email-bubble-avatar",
+    ".email-tags-toggle-inline",
+    ".dropdown-cancel-mobile",
+    ".email-field #doc-email-subject",
+    ".doc-save-button[data-save-state=\"saving\"] .doc-save-state-saving",
+    ".doc-rich-empty-import",
+    ".email-attachment-chip.is-expanded",
+    ".email-attachment-open",
+    ".email-compose-chip .compose-chip-name",
+    ".email-odysseus-attach-menu",
+    ".email-odysseus-attach-list",
+    "#email-lib-settings-btn",
+    "#email-lib-compose-btn svg",
+    ".email-settings-section[open] > .email-settings-section-body",
+    ".email-settings-auto-reply-title-row",
+    ".email-settings-auto-reply-section .email-settings-section-body",
+    ".email-settings-auto-reply-section .email-settings-section-desc",
+    ".email-settings-display-section .email-settings-section-desc",
+    ".email-settings-clean-btn",
+    ".email-settings-grid",
+    "body.notes-view .chat-container",
+    "body.notes-drag-mode .note-card",
+    ".note-fullscreen-overlay .note-cl-add-row .note-cl-add",
+    ".notes-pane-title",
+    ".notes-header-btn-label",
+    ".notes-header-text-btn",
+    ".notes-quick-add",
+    ".note-card-edit-corner",
+    ".note-card-copy-corner",
+    ".note-card-done",
+    ".note-card-corner-copy",
+    ".note-card-corner-copy svg",
+    ".note-card-colors",
+    ".notes-quick-input",
+    ".notes-quick-icon",
+    ".notes-quick-type-seg",
+    ".notes-quick-type-pill",
+    ".notes-quick-type-pill svg",
+    ".note-form-remind-btn",
+    ".note-form-type-pill",
+    ".notes-pane.notes-view-grid .notes-pane-body",
+    ".notes-pane.notes-view-grid .note-card",
+    ".notes-pane.notes-view-grid .note-form",
+    ".notes-pane.notes-view-grid .notes-labels-bar",
+    ".notes-pane.notes-view-grid .notes-quick-add",
+    ".note-check-text",
+    ".note-color-red",
+    ".note-color-orange",
+    ".note-color-yellow",
+    ".note-color-green",
+    ".note-color-blue",
+    ".note-color-purple",
+    ".note-form-actions-group",
+    ".note-form-header",
+    ".note-form-meta .note-form-label",
+    ".cal-toolbar",
+    ".cal-quickadd-row",
+    ".cal-toolbar-right",
+    ".cal-title",
+    "button.cal-nav.cal-toolbar-arrow",
+    "button.cal-add-btn.cal-add-btn-text",
+    ".cal-add-plus",
+    ".cal-add-label",
+    "button.cal-add-btn.cal-add-btn-text.cal-add-btn-sm",
+    "button.cal-add-btn.cal-add-btn-text.cal-add-btn-sm .cal-add-label",
+    "button.cal-add-btn.cal-add-btn-text.cal-add-btn-sm .cal-add-plus",
+    ".cal-wk-zoom",
+    ".cal-detail-header",
+    ".email-search-row .memory-search-input",
+    ".email-attach-toggle-inline",
+    ".email-undone-toggle-inline",
+    ".email-reminder-toggle-inline",
+    ".email-search-options-menu button",
+    "#email-lib-modal .email-lib-sync-status",
+    ".cal-filter-item",
+    ".cal-filter-toggle",
+    ".cal-day",
+    ".cal-day-num",
+    ".cal-event-row",
+    ".cal-multiday",
+    ".cal-splitter",
+    ".cal-splitter-grip",
+    ".cal-event-item",
+    ".cal-wk-wrap",
+    ".cal-wk-block",
+    ".cal-wk-block-name",
+    ".cal-wk-block-time",
+    ".cal-year",
+    ".cal-year-cell",
+    ".cal-form-bespoke",
+    ".cal-form-mobile-cancel",
+    ".cal-hero-time",
+    ".cal-modal-container",
+    ".research-new-job h2",
+    ".research-start-btn",
+    ".research-category-row",
+    ".research-cat",
+    ".research-badge",
+    ".research-sb-dot",
+    ".cp-popover",
+    ".cp-sl",
+    "#research-pane",
+    "#research-pane .research-pane-body",
+    ".research-job-action[data-action=\"delete\"]",
+    ".hwfit-schedule-row",
+    ".hwfit-sched-day-chip",
+    ".ask-user-card",
+    ".ask-user-card-attached",
+    ".ask-user-question",
+    ".ask-user-option",
+    ".ask-user-option-label",
+    ".ask-user-option-desc",
+    ".ask-user-other",
+    ".ask-user-other-send",
+    ".settings-sidebar.settings-sidebar-collapsed",
+    ".settings-sidebar.settings-sidebar-collapsed .settings-sidebar-content",
+    "#research-pane .research-history-card",
+    "#research-pane .research-history-toolbar-row",
+    "#research-pane .research-history-toolbar-row .memory-sort-select",
+    "#research-pane #research-past-list .research-job-card",
+    "#research-pane #research-past-list .research-job-header",
+    "#research-pane #research-past-list .research-job-more",
+    ".msg-actions",
+    ".chat-history",
+    ".doclib-card",
+    ".doclib-grid",
+    ".doclib-expanded-delete-btn",
+    ".memory-item",
+    ".memory-item-title",
+    ".settings-select",
+    ".settings-row",
+    ".admin-card",
+    ".admin-btn-add",
+    ".admin-btn-sm",
+    ".admin-switch",
+    ".admin-slider",
+    ".email-reader-body",
+    ".email-reader",
+    ".cal-grid",
+    ".research-job-card",
+    ".close-btn",
+    ".dropdown",
+    ".dropdown-item",
+    ".list-item",
+    "code",
+    "table",
+    "th",
+    "td",
+    "a",
+    "h2",
+    ".sidebar .section",
+    ".sidebar-user-bar",
+    ".icon-rail-btn",
+    ".memory-toolbar-btn",
+    ".theme-grid",
+    ".preset-range",
+    ".settings-system-logs-tab"
+   ],
+   "stylesheetsFrom": "/static/index.html"
+  }
+ ]
+}
diff --git a/tests/test_css_computed_style_snapshot.py b/tests/test_css_computed_style_snapshot.py
new file mode 100644
index 000000000..88977ade3
--- /dev/null
+++ b/tests/test_css_computed_style_snapshot.py
@@ -0,0 +1,104 @@
+"""Computed-style snapshot regression for ``static/style.css``.
+
+The stylesheet is one 51k-line file whose result depends on source order, so an
+extraction that "looks fine" can still change which declaration wins. These
+tests capture ``getComputedStyle`` over a fixed element inventory across pages,
+viewports, themes and density modes, and compare the hash against
+``tests/css_snapshot/baseline.json``.
+
+Run ``python scripts/css_snapshot.py --write-baseline`` to re-record the
+baseline, and only after confirming the change is intended - see
+``tests/css_snapshot/README.md``.
+"""
+import os
+
+import pytest
+
+from tests.helpers.cli_loader import load_script
+
+snapshot = load_script("css_snapshot.py")
+
+_HAS_BROWSER = snapshot.playwright_available()
+_requires_browser = pytest.mark.skipif(
+    not _HAS_BROWSER,
+    reason="node with the playwright package is required (npm ci)",
+)
+
+# The session static server publishes its ephemeral origin here. The literal
+# fallback is the fixed port the fixture used before it moved to an ephemeral
+# one, so this module works on either revision.
+STATIC_ORIGIN = os.environ.get("ODYSSEUS_TEST_STATIC_ORIGIN", "http://127.0.0.1:7011")
+
+# One conflicting selector used to prove the harness is actually sensitive to
+# source order. `.attach-strip` is declared three times at the top level of
+# style.css with different margin, min-height and padding, so swapping the
+# first two changes which declaration wins without changing a single byte of
+# any individual rule.
+CONFLICTING_SELECTOR = ".attach-strip"
+
+
+def test_baseline_covers_every_inventory_entry():
+    """The committed baseline and the inventory describe the same surface.
+
+    Cheap and browserless: it catches an inventory entry added without
+    re-recording the baseline, which would otherwise look like a pass because
+    nothing compares an absent key.
+    """
+    inventory = snapshot.load_inventory()
+    baseline = snapshot.load_baseline()
+
+    variant_names = {variant["name"] for variant in inventory["variants"]}
+    for page in inventory["pages"]:
+        name = page["name"]
+        assert name in baseline["elements"], f"{name} missing from the baseline"
+        expected_keys = {entry["key"] for entry in page.get("elements", [])}
+        expected_keys |= set(page.get("bench", []))
+        assert set(baseline["elements"][name]) == expected_keys, (
+            f"{name}: baseline elements differ from the inventory; "
+            "re-record with scripts/css_snapshot.py --write-baseline"
+        )
+        assert set(baseline["variants"][name]) == variant_names
+
+
+@_requires_browser
+def test_computed_styles_match_the_committed_baseline():
+    captured = snapshot.capture(STATIC_ORIGIN)
+
+    assert captured["missing"] == {}, (
+        "inventory entries matched no element - the markup moved under the "
+        f"harness: {captured['missing']}"
+    )
+
+    summary = snapshot.summarize(captured["snapshot"])
+    drift = snapshot.compare(snapshot.load_baseline(), summary)
+    assert not drift["elements"] and not drift["variants"] and not drift["digest_changed"], (
+        "computed styles moved against tests/css_snapshot/baseline.json.\n"
+        f"elements: {drift['elements']}\n"
+        f"variants: {drift['variants']}\n"
+        "If the change is intended, re-record with "
+        "`python scripts/css_snapshot.py --write-baseline`; if it is not, the "
+        "restructuring changed which declaration wins."
+    )
+
+
+@_requires_browser
+def test_reordering_two_conflicting_declarations_moves_the_digest():
+    """The harness has to fail when the cascade changes, or it proves nothing.
+
+    Captures one variant twice - once normally, once with the first two
+    top-level `.attach-strip` blocks swapped - and asserts the digest moves and
+    points at the affected element.
+    """
+    variants = ["desktop-dark-comfortable"]
+    unchanged = snapshot.summarize(
+        snapshot.capture(STATIC_ORIGIN, variants=variants)["snapshot"]
+    )
+    reordered = snapshot.summarize(
+        snapshot.capture(STATIC_ORIGIN, variants=variants,
+                         swap_rule=CONFLICTING_SELECTOR)["snapshot"]
+    )
+
+    assert unchanged["digest"] != reordered["digest"]
+    drift = snapshot.compare(unchanged, reordered)
+    assert "app-shell/attach-strip" in drift["elements"]
+    assert "bench/.attach-strip" in drift["elements"]
diff --git a/tests/test_static_stylesheet_manifest.py b/tests/test_static_stylesheet_manifest.py
new file mode 100644
index 000000000..fd1082660
--- /dev/null
+++ b/tests/test_static_stylesheet_manifest.py
@@ -0,0 +1,102 @@
+"""Stylesheet asset manifest: shipped HTML and the service worker must agree.
+
+``specs/frontend.md`` records that nothing validates the service-worker
+precache against what ``index.html`` actually loads, and that a static asset
+manifest regression should confirm referenced files exist. Both matter more
+once ``static/style.css`` starts being split: every new stylesheet has to be
+registered in ``static/index.html`` *and* in the ``static/sw.js`` precache,
+with the same ``?v=`` cache-bust string in both. Today those two strings are
+hardcoded independently, so a split that updates one and not the other ships an
+offline cache that serves a stale or missing stylesheet - invisible until
+someone loads the app without a network.
+
+This test reads the shipped files rather than driving a browser: the artifact
+under test *is* the URL string in two files, and a browser would only see one
+of them at a time.
+"""
+import re
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+INDEX_HTML = ROOT / "static" / "index.html"
+SERVICE_WORKER = ROOT / "static" / "sw.js"
+
+_STYLESHEET_LINK = re.compile(
+    r"""<link\b[^>]*\brel=["']stylesheet["'][^>]*>""", re.IGNORECASE)
+_HREF = re.compile(r"""\bhref=["']([^"']+)["']""", re.IGNORECASE)
+
+
+def _stylesheet_hrefs(html_path):
+    """Every href from a <link rel="stylesheet"> in one HTML file."""
+    html = html_path.read_text(encoding="utf-8")
+    hrefs = []
+    for tag in _STYLESHEET_LINK.findall(html):
+        match = _HREF.search(tag)
+        if match:
+            hrefs.append(match.group(1))
+    return hrefs
+
+
+def _precache_entries(name):
+    """The quoted URLs of one precache array in sw.js.
+
+    Entries built by spreading another list (``...KATEX_FONTS``) are skipped:
+    they carry no literal URL at this level, and the fonts they add are not
+    stylesheets.
+    """
+    source = SERVICE_WORKER.read_text(encoding="utf-8")
+    match = re.search(rf"const {name} = \[(.*?)\n\];", source, re.DOTALL)
+    assert match, f"{name} array not found in static/sw.js"
+    return re.findall(r"""['"](/[^'"]+)['"]""", match.group(1))
+
+
+def _local_path(url):
+    """Map an app-absolute URL to the file it is served from."""
+    return ROOT / url.split("?", 1)[0].lstrip("/")
+
+
+def test_every_stylesheet_referenced_by_shipped_html_exists():
+    checked = 0
+    for html_path in sorted((ROOT / "static").glob("*.html")):
+        for href in _stylesheet_hrefs(html_path):
+            if not href.startswith("/"):
+                continue  # external or relative-to-page; not ours to resolve
+            assert _local_path(href).is_file(), (
+                f"{html_path.name} links {href}, which does not exist on disk"
+            )
+            checked += 1
+    assert checked, "no app stylesheet links found - the parser or the markup moved"
+
+
+def test_every_precached_stylesheet_exists():
+    for name in ("PRECACHE", "PANEL_PRECACHE"):
+        for url in _precache_entries(name):
+            if not url.endswith(".css") and ".css?" not in url:
+                continue
+            assert _local_path(url).is_file(), (
+                f"sw.js {name} precaches {url}, which does not exist on disk"
+            )
+
+
+def test_index_stylesheets_are_precached_with_the_same_cache_bust_string():
+    """The precache must match the request the browser actually makes.
+
+    A service-worker entry only matches a fetch when the URL is identical,
+    query string included, so a stylesheet whose ``?v=`` differs between the
+    two files is precached under a URL nothing ever requests.
+    """
+    precached = set(_precache_entries("PRECACHE"))
+    precached_paths = {url.split("?", 1)[0]: url for url in precached}
+
+    for href in _stylesheet_hrefs(INDEX_HTML):
+        if not href.startswith("/static/"):
+            continue
+        path = href.split("?", 1)[0]
+        assert path in precached_paths, (
+            f"index.html loads {href} but sw.js PRECACHE has no entry for {path}; "
+            "the app shell would not be available offline"
+        )
+        assert precached_paths[path] == href, (
+            f"cache-bust mismatch for {path}: index.html requests {href!r}, "
+            f"sw.js precaches {precached_paths[path]!r}"
+        )