"""
Mobile layout regression tests — run on every QA pass.

These tests check that the CSS and HTML structure required for correct
mobile rendering (375px–640px viewport widths) is intact after every change.
They are static checks (no server needed) that catch common regressions:

  - Mobile breakpoints present for key layout elements
  - Right panel slide-over markup and CSS intact
  - Profile dropdown not clipped by overflow on mobile
  - Composer footer chips scroll correctly on narrow viewports
  - Mobile sidebar navigation stays available on phones
  - No full-viewport overflow that would break scroll

Run as part of the standard test suite:
    ./scripts/test.sh tests/test_mobile_layout.py -v
"""

import pathlib
import re
from html.parser import HTMLParser

REPO = pathlib.Path(__file__).parent.parent
HTML = (REPO / "static" / "index.html").read_text(encoding="utf-8")
CSS  = (REPO / "static" / "style.css").read_text(encoding="utf-8")


def _max_width_media_blocks(width_px):
    """Return all @media(max-width:Npx) bodies using balanced braces."""
    pattern = re.compile(rf'@media\s*\(\s*max-width\s*:\s*{width_px}px\s*\)\s*\{{')
    blocks = []
    for match in pattern.finditer(CSS):
        open_brace = match.end() - 1
        depth = 0
        for idx in range(open_brace, len(CSS)):
            if CSS[idx] == "{":
                depth += 1
            elif CSS[idx] == "}":
                depth -= 1
                if depth == 0:
                    blocks.append(CSS[open_brace + 1:idx])
                    break
    return blocks


def _composer_phone_media_block():
    for block in _max_width_media_blocks(640):
        if ".composer-footer" in block:
            return block
    raise AssertionError("Missing composer rules in @media(max-width:640px)")


def _strip_css_comments(css):
    return re.sub(r'/\*.*?\*/', '', css, flags=re.DOTALL)


def _rule_body(css, selector):
    for match in re.finditer(r'([^{}]+)\{([^{}]*)\}', _strip_css_comments(css)):
        selectors = {part.strip() for part in match.group(1).split(",")}
        if selector in selectors:
            return match.group(2)
    raise AssertionError(f"Missing CSS rule for {selector}")


def _declarations(rule_body):
    declarations = {}
    for item in rule_body.split(";"):
        if ":" not in item:
            continue
        prop, value = item.split(":", 1)
        declarations[prop.strip()] = re.sub(r'\s+', ' ', value.strip())
    return declarations


def _js_function_body(source, function_name):
    """Return a JavaScript function body using balanced braces."""
    match = re.search(rf'function\s+{re.escape(function_name)}\s*\([^)]*\)\s*\{{', source)
    if not match:
        raise AssertionError(f"Missing JavaScript function {function_name}()")
    open_brace = match.end() - 1
    depth = 0
    for idx in range(open_brace, len(source)):
        if source[idx] == "{":
            depth += 1
        elif source[idx] == "}":
            depth -= 1
            if depth == 0:
                return source[open_brace + 1:idx]
    raise AssertionError(f"Could not parse JavaScript function {function_name}()")


def _optional_declarations(css, selector):
    try:
        return _declarations(_rule_body(css, selector))
    except AssertionError:
        return {}


def _js_function_body(src, name):
    signature = f"function {name}("
    start = src.find(signature)
    if start == -1:
        raise AssertionError(f"Missing JS function {name}()")
    brace = src.find("{", start)
    if brace == -1:
        raise AssertionError(f"Missing function body for {name}()")
    depth = 0
    for idx in range(brace, len(src)):
        char = src[idx]
        if char == "{":
            depth += 1
        elif char == "}":
            depth -= 1
            if depth == 0:
                return src[brace + 1:idx]
    raise AssertionError(f"Unterminated JS function {name}()")


def _display_hidden(declarations):
    return declarations.get("display", "").replace(" ", "") in {"none", "none!important"}


def _display_inline_flex(declarations):
    return declarations.get("display", "").replace(" ", "") in {"inline-flex", "inline-flex!important"}


class _ComposerLeftDropdownParser(HTMLParser):
    _VOID_TAGS = {
        "area", "base", "br", "col", "embed", "hr", "img", "input",
        "link", "meta", "param", "source", "track", "wbr",
    }

    def __init__(self):
        super().__init__()
        self.stack = []
        self.violations = []

    def handle_starttag(self, tag, attrs):
        self._handle_element(tag, attrs, push=True)

    def handle_startendtag(self, tag, attrs):
        self._handle_element(tag, attrs, push=False)

    def handle_endtag(self, tag):
        tag = tag.lower()
        for idx in range(len(self.stack) - 1, -1, -1):
            if self.stack[idx]["tag"] == tag:
                del self.stack[idx:]
                break

    def _handle_element(self, tag, attrs, push):
        tag = tag.lower()
        attrs = dict(attrs)
        classes = set((attrs.get("class") or "").split())
        element_id = attrs.get("id") or ""
        inside_composer_left = any(
            "composer-left" in item["classes"] for item in self.stack
        )
        is_dropdown = (
            element_id.endswith("Dropdown") or
            any("dropdown" in class_name for class_name in classes)
        )
        if inside_composer_left and is_dropdown:
            label = f"#{element_id}" if element_id else "." + ".".join(sorted(classes))
            self.violations.append(label)
        if push and tag not in self._VOID_TAGS:
            self.stack.append({"tag": tag, "classes": classes})


# ── Mobile breakpoint rules ───────────────────────────────────────────────────

def test_mobile_breakpoint_900px_present():
    """@media(max-width:900px) must hide the right panel and show mobile-files-btn."""
    assert "@media(max-width:900px)" in CSS or "@media (max-width: 900px)" in CSS, \
        "Missing @media(max-width:900px) breakpoint in style.css"
    # Right panel should be hidden at 900px, replaced by slide-over
    assert ".rightpanel{display:none" in CSS or ".rightpanel {display:none" in CSS or \
           re.search(r'max-width:900px\).*?\.rightpanel\{display:none', CSS, re.DOTALL), \
        ".rightpanel must be display:none at max-width:900px (slide-over replaces it)"


def test_mobile_breakpoint_640px_present():
    """@media(max-width:640px) must exist for narrow phone layouts."""
    assert "@media(max-width:640px)" in CSS or "@media (max-width: 640px)" in CSS, \
        "Missing @media(max-width:640px) breakpoint in style.css"


def test_settings_system_version_controls_wrap_on_phone_widths():
    """Settings -> System version badges must wrap instead of overflowing phones."""
    mobile_css = "\n".join(_max_width_media_blocks(768))
    assert ".settings-section-head" in mobile_css, (
        "Settings section header needs a mobile rule so title and update controls stack."
    )
    assert "flex-direction:column" in mobile_css.replace(" ", ""), (
        "Settings section header should stack vertically on mobile."
    )
    assert "#checkUpdatesBlock" in mobile_css, (
        "Settings update/version controls need a mobile rule."
    )
    assert "flex-wrap:wrap" in mobile_css.replace(" ", ""), (
        "Version badges and Check now button must wrap instead of overflowing."
    )
    assert "width:100%" in mobile_css.replace(" ", ""), (
        "The update controls row should take the available mobile width."
    )
    assert ".settings-version-badge" in mobile_css and "white-space:nowrap" in mobile_css.replace(" ", ""), (
        "Individual version badges should stay intact while the group wraps."
    )


def test_rightpanel_mobile_slide_over_css():
    """Right panel must have position:fixed slide-over CSS for mobile."""
    # At max-width:900px the rightpanel should be position:fixed, off-screen right
    assert "position:fixed" in CSS, \
        "style.css must have position:fixed for rightpanel mobile slide-over"
    assert ".rightpanel.mobile-open{right:0" in CSS or ".rightpanel.mobile-open {right:0" in CSS, \
        ".rightpanel.mobile-open must set right:0 to slide panel in from right"
    assert "min(300px, 100vw)" in CSS or "min(300px,100vw)" in CSS, \
        "rightpanel mobile width should be capped defensively with 100vw"
    assert "var(--mobile-rightpanel-width)" in CSS, \
        "mobile rightpanel width variable should be used in compact mode rules"
    assert "calc(-1 * var(--mobile-rightpanel-width))" in CSS, \
        "closed mobile rightpanel should be off-canvas using a width-based negative offset"
    mobile_640 = re.search(r'@media\(max-width:640px\)\{([^{}]*(?:\{[^{}]*\}[^{}]*)*)\}', CSS, re.DOTALL)
    assert mobile_640, "@media(max-width:640px) block missing from style.css"
    rightpanel_block = mobile_640.group(1)
    assert re.search(r'\.rightpanel\{[^}]*width:\s*var\(--mobile-rightpanel-width\)\s*!important',
                     rightpanel_block, re.DOTALL), \
        ".rightpanel width must use var(--mobile-rightpanel-width) with !important in mobile block"
    assert re.search(r'\.rightpanel\.mobile-open\{[^}]*right:\s*0\s*!important',
                     rightpanel_block, re.DOTALL), \
        "mobile-open mobile rightpanel must force right:0 with !important"
    assert re.search(r'\.rightpanel\{[^}]*box-shadow:\s*none\s*!important',
                     rightpanel_block, re.DOTALL), \
        "closed mobile rightpanel should have no shadow to avoid right-edge bleed"
    assert re.search(r'\.rightpanel\{[^}]*padding-top:\s*var\(--app-titlebar-safe-top\)',
                     rightpanel_block, re.DOTALL), \
        "mobile rightpanel should reserve the same PWA top inset as the titlebar"
    assert re.search(r'\.rightpanel\{[^}]*box-sizing:\s*border-box',
                     rightpanel_block, re.DOTALL), \
        "mobile rightpanel safe-area padding must stay inside its fixed height"
    assert re.search(r'\.rightpanel\.mobile-open\{[^}]*box-shadow:\s*-4px 0 24px rgba\(0,\s*0,\s*0,\s*\.?4\)',
                     rightpanel_block, re.DOTALL), \
        "open mobile rightpanel should keep the edge shadow"
    assert re.search(r'\.rightpanel\s+\.panel-header\{[^}]*row-gap:\s*8px', rightpanel_block), \
        "mobile workspace header should keep comfortable row spacing"


def test_mobile_sidebar_drawer_uses_transform_instead_of_left():
    """Mobile sidebar drawer open/close must animate with transform not left offsets."""
    mobile_640 = "\n".join(_max_width_media_blocks(640))
    assert mobile_640, "Missing @media(max-width:640px) block in style.css"

    sidebar_rule = _declarations(_rule_body(mobile_640, ".sidebar"))
    sidebar_open_rule = _declarations(_rule_body(mobile_640, ".sidebar.mobile-open"))

    assert sidebar_rule.get("left") == "0", \
        "Mobile .sidebar should keep left:0 in the drawer rules"
    assert sidebar_rule.get("transform") == "translateX(-100%)", \
        "Closed mobile .sidebar should use transform:translateX(-100%)"
    assert sidebar_rule.get("transition") == "transform .25s ease", \
        "Mobile .sidebar should transition transform for drawer animation"
    assert sidebar_rule.get("will-change") == "transform", \
        "Mobile .sidebar should promote the transform layer before drawer animation"
    assert sidebar_open_rule.get("transform") == "translateX(0)", \
        "Open mobile .sidebar should use transform:translateX(0)"


def test_workspace_panel_inline_width_is_desktop_only():
    """Persisted rightpanel width must only be restored above compact/mobile breakpoints."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    assert "function _syncWorkspacePanelInlineWidth()" in boot_js, \
        "_syncWorkspacePanelInlineWidth() must exist to keep panel width mobile-safe"
    assert "_syncWorkspacePanelInlineWidth();" in boot_js, \
        "_syncWorkspacePanelInlineWidth() must be called when viewport changes"
    assert "localStorage.getItem('hermes-panel-w')" in boot_js, \
        "Panel width helper must source hermes-panel-w from localStorage"
    assert "_workspacePanelEls();" in boot_js and "style.removeProperty('width')" in boot_js, \
        "Panel helper must clear inline width while in compact/mobile viewport"


def test_workspace_panel_boot_restore_is_desktop_only():
    """Persisted workspace panels should not auto-cover compact/mobile launch."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    assert "if(_ephPanelPref&&!_isCompactWorkspaceViewport()) _workspacePanelMode='browse';" in boot_js
    assert "if(S.session&&S.session.workspace&&panelPref&&!_isCompactWorkspaceViewport()){" in boot_js
    assert "if(_freshPanelPref&&!_isCompactWorkspaceViewport()) _workspacePanelMode='browse';" in boot_js


def _container_query_block(css: str, container_query: str):
    query_pattern = re.compile(
        rf'@container\s+{re.escape(container_query)}\s*\{{',
        re.DOTALL,
    )
    for match in query_pattern.finditer(css):
        start = match.end() - 1
        end = css.find("@container", start + 1)
        if end == -1:
            end = css.find("@media", start + 1)
        if end == -1:
            end = len(css)
        block = css[start + 1:end]
        return block
    return ""


def _container_media_block(css: str, media_query: str):
    query_pattern = re.compile(
        rf'@media\s*\(\s*max-width:\s*{re.escape(media_query)}\s*\)\s*\{{',
        re.DOTALL,
    )

    def _media_block_end(css_text: str, open_brace_idx: int) -> int:
        depth = 0
        for idx in range(open_brace_idx, len(css_text)):
            if css_text[idx] == "{":
                depth += 1
            elif css_text[idx] == "}":
                depth -= 1
                if depth == 0:
                    return idx
        return -1

    def _strip_nested_media(block: str) -> str:
        parts = []
        cursor = 0
        while True:
            nested = block.find("@media", cursor)
            if nested == -1:
                parts.append(block[cursor:])
                break
            parts.append(block[cursor:nested])
            nested_open = block.find("{", nested)
            if nested_open == -1:
                break
            nested_close = _media_block_end(block, nested_open)
            if nested_close == -1:
                break
            cursor = nested_close + 1
        return "".join(parts)

    for match in query_pattern.finditer(css):
        start = match.end() - 1
        end = _media_block_end(css, start)
        if end == -1:
            continue
        block = css[start + 1:end]
        block = _strip_nested_media(block)
        if ".composer-profile-label" in block or ".composer-profile-chip" in block:
            return block
    return ""


def test_composer_controls_switch_to_fit_stage_classes():
    """Composer controls should progressively compact based on measured overflow."""
    assert re.search(r'\.composer-footer\s*\{[^}]*container-type:inline-size[^}]*container-name:composer-footer[^}]*\}', CSS), \
        ".composer-footer should define container-type:inline-size and container-name:composer-footer"
    assert "@container composer-footer (max-width: 700px)" not in CSS
    assert "@container composer-footer (max-width: 520px)" not in CSS
    ui_js = (REPO / "static" / "ui.js").read_text(encoding="utf-8")
    fit_body = _js_function_body(ui_js, "_fitComposerFooter")
    assert "scrollWidth" in fit_body and "clientWidth" in fit_body, \
        "_fitComposerFooter() should measure actual left-cluster overflow"
    assert "cf-icons" in fit_body and "cf-burger" in fit_body, \
        "_fitComposerFooter() should toggle the compact stage classes"

    for selector in (
        ".composer-footer.cf-icons .composer-profile-label",
        ".composer-footer.cf-icons .composer-profile-chevron",
        ".composer-footer.cf-icons #composerProfileLabel",
        ".composer-footer.cf-icons .composer-workspace-label",
        ".composer-footer.cf-icons #composerWorkspaceLabel",
        ".composer-footer.cf-icons .composer-model-label",
        ".composer-footer.cf-icons #composerModelLabel",
        ".composer-footer.cf-icons .composer-profile-chip",
        ".composer-footer.cf-icons .composer-model-chip",
        ".composer-footer.cf-icons .composer-divider",
    ):
        assert selector in CSS, f"{selector} should be present in the .cf-icons rules"
    assert ".composer-footer.cf-icons .composer-profile-chip{box-sizing:border-box;width:44px" in CSS, \
        ".cf-icons should collapse the profile chip to an icon-sized control"
    assert ".composer-footer.cf-icons .composer-workspace-chip{display:none!important" not in CSS.replace(" ", ""), \
        ".cf-icons should keep the workspace switch visible rather than blanking it"

    for selector in (
        ".composer-footer.cf-burger .composer-workspace-group",
        ".composer-footer.cf-burger .composer-workspace-files-btn",
        ".composer-footer.cf-burger .composer-workspace-chip",
        ".composer-footer.cf-burger .composer-left > .composer-model-wrap",
        ".composer-footer.cf-burger .provider-quota-chip",
        ".composer-footer.cf-burger .composer-left > .composer-reasoning-wrap",
        ".composer-footer.cf-burger .composer-left > .composer-toolsets-wrap",
        ".composer-footer.cf-burger .composer-mobile-config-btn",
        ".composer-footer.cf-burger .composer-mobile-config-panel.open",
        ".composer-footer.cf-burger .composer-mobile-context-action",
        ".composer-footer.cf-burger .ctx-indicator-wrap",
    ):
        assert selector in CSS, f"{selector} should be present in the .cf-burger rules"
    assert ".composer-footer.cf-burger .composer-workspace-chip{display:none!important".replace(" ", "") in CSS.replace(" ", ""), \
        ".cf-burger must remove the blank workspace switch slot"
    assert ".composer-footer.cf-burger .provider-quota-chip" in CSS and ".composer-footer.cf-burger .composer-left > .composer-toolsets-wrap{display:none!important" in CSS, \
        ".cf-burger must fold the inline quota chip into the shared config menu"
    assert ".composer-footer.cf-burger .composer-mobile-config-btn{box-sizing:border-box;position:relative;display:inline-flex!important" in CSS, \
        ".cf-burger must expose the config button even on wider viewports"

    # Regression intent:
    # - this measured rule should not depend on right-panel open/closed state.
    # - left-sidebar-only constriction must still collapse composer controls together.
    assert ".layout:not(.workspace-panel-collapsed)" not in CSS, \
        "composer-footer compact stages should be state-agnostic"


def test_composer_icon_stage_workspace_switch_does_not_become_blank_chip():
    """The icon stage may hide workspace text, but keeps a visible switch affordance."""
    css_ns = CSS.replace(" ", "")
    assert ".composer-footer.cf-icons .composer-workspace-label" in CSS
    assert ".composer-footer.cf-icons #composerWorkspaceLabel" in CSS
    assert ".composer-footer.cf-icons .composer-workspace-chip{display:none!important" not in css_ns, \
        ".cf-icons must not hide the visible workspace switch chip"
    assert ".composer-footer.cf-icons .composer-workspace-chevron{display:none" not in css_ns, \
        ".cf-icons must not leave the visible workspace switch chip without its chevron"


def test_composer_compact_switch_is_not_viewport_only():
    """Compact controls should be content-triggered, not bound to viewport width alone."""
    assert ".composer-footer.cf-icons" in CSS, \
        "Icon-chip stage should be expressed as the .cf-icons class"
    assert ".composer-footer.cf-burger" in CSS, \
        "Hamburger stage should be expressed as the .cf-burger class"
    ui_js = (REPO / "static" / "ui.js").read_text(encoding="utf-8")
    assert "_fitComposerFooter" in ui_js and "scrollWidth" in ui_js, \
        "Composer compacting should be driven by measured overflow"
    assert "ResizeObserver" in ui_js and "MutationObserver" in ui_js, \
        "Composer fitting should rerun when footer size or chip content changes"
    assert "composer-footer (max-width: 700px)" not in CSS
    assert "composer-footer (max-width: 520px)" not in CSS
    assert re.search(r'@container\s+composer-footer\s*\(max-width:\s*860px\)', CSS) is None, \
        "Full icon-only should not be tied to a 860px threshold any more"
    assert re.search(r'@container\s+composer-footer\s*\(max-width:\s*1000px\)', CSS) is None, \
        "Full icon-only/first-stage container gate should not be tied to 1000px"
    media_860 = _container_media_block(CSS, "860px")
    assert media_860 == "", \
        "Composer compact breakpoint should not be a dedicated 860px viewport media query"
    media_900 = _container_media_block(CSS, "900px")
    assert media_900 == "", \
        "Composer compact breakpoint should use container queries, not viewport media at 900px"

def test_mobile_overlay_present():
    """Legacy mobile overlay stays hidden because the phone sidebar is full-screen."""
    assert 'id="mobileOverlay"' in HTML, \
        "#mobileOverlay element missing from index.html"
    assert "mobile-overlay" in CSS, \
        ".mobile-overlay CSS rule missing from style.css"
    mobile_css = "\n".join(_max_width_media_blocks(640))
    assert re.search(r'\.mobile-overlay\.visible\{[^}]*display:\s*none', mobile_css), (
        "Full-screen mobile sidebar must not dim the PWA status/safe-area with a backdrop"
    )


def test_mobile_sidebar_edge_guard_claims_body_edge_only():
    """A narrow body-only edge guard helps iOS hand left swipes to WebUI."""
    assert 'id="pwaSidebarEdgeGuard"' in HTML, (
        "mobile sidebar edge guard missing from index.html"
    )
    assert ".pwa-sidebar-edge-guard{display:none;}" in CSS.replace(" ", ""), (
        "edge guard should be hidden outside the phone layout"
    )
    mobile_css = "\n".join(_max_width_media_blocks(640))
    guard = _declarations(_rule_body(mobile_css, ".pwa-sidebar-edge-guard"))
    assert guard.get("display") == "block"
    assert guard.get("position") == "fixed"
    assert guard.get("left") == "0"
    assert guard.get("top") == "calc(52px + var(--app-titlebar-safe-top))", (
        "edge guard should start below the PWA titlebar so it does not block hamburger"
    )
    assert guard.get("width") == "24px"
    assert guard.get("pointer-events") == "none", (
        "edge guard must be pointer-events:none so taps/vertical scrolls starting in the "
        "strip fall through to the .messages scroller; the edge-swipe gesture is handled by "
        "window-level capture listeners, not by the guard intercepting hit-testing (#4660 review)"
    )
    assert guard.get("z-index") == "198", (
        "edge guard should sit below the full-screen sidebar but above the page body"
    )


def test_sidebar_nav_present():
    """Sidebar top navigation tabs must be present."""
    assert 'class="sidebar-nav"' in HTML, \
        ".sidebar-nav missing from index.html"
    assert ".sidebar-nav{" in CSS or ".sidebar-nav {" in CSS, \
        ".sidebar-nav CSS rule missing from style.css"


def test_mobile_keeps_panel_navigation_available():
    """Phone breakpoint must keep panel navigation available inside the drawer."""
    mobile_css = "\n".join(_max_width_media_blocks(640))
    assert mobile_css, "Missing @media(max-width:640px) block in style.css"
    assert ".sidebar-nav" in mobile_css, \
        "Phone panel navigation must remain available in the hamburger drawer"


def test_mobile_sidebar_opens_as_full_screen_surface_with_panel_rail():
    """Phone sidebar should open full-screen while keeping the panel rail visible."""
    mobile_css = "\n".join(_max_width_media_blocks(640))
    assert re.search(r'\.app-titlebar-hamburger,\s*\.app-titlebar-spacer\{[^}]*display:\s*flex', mobile_css), (
        "Phone titlebar hamburger must stay visible"
    )
    assert not re.search(r'\.rail\{[^}]*display:\s*flex[^}]*position:\s*fixed', mobile_css), (
        "Phone must not use a persistent left rail that consumes chat width"
    )
    sidebar_rule = _declarations(_rule_body(mobile_css, ".sidebar"))
    sidebar_open_rule = _declarations(_rule_body(mobile_css, ".sidebar.mobile-open"))
    assert sidebar_rule.get("left") == "0", (
        "Mobile sidebar should stay at left:0 and move with transform"
    )
    assert sidebar_rule.get("width") == "100vw", (
        "Mobile sidebar should fill the viewport like a session page"
    )
    assert sidebar_rule.get("max-width") == "none", (
        "Mobile sidebar must not retain desktop/drawer max width"
    )
    assert sidebar_rule.get("transform") == "translateX(-100%)", (
        "Closed mobile sidebar should sit fully offscreen"
    )
    assert sidebar_rule.get("transition") == "transform .25s ease", (
        "Mobile sidebar should animate with transform"
    )
    assert sidebar_rule.get("will-change") == "transform", (
        "Mobile sidebar should promote the transform layer before opening"
    )
    assert sidebar_open_rule.get("transform") == "translateX(0)", (
        "Open mobile sidebar should slide the full session page into view"
    )
    assert not re.search(r'\.sidebar\s+\.sidebar-nav\{[^}]*display:\s*none', mobile_css), (
        "Full-screen mobile sidebar should keep the panel rail visible"
    )
    assert re.search(r'\.sidebar-nav\{[^}]*position:\s*absolute', mobile_css), (
        "Phone drawer panel tabs should be laid out as an internal side strip"
    )
    assert re.search(r'\.sidebar-nav\{[^}]*width:\s*52px', mobile_css), (
        "Phone drawer panel strip should reserve stable space for 44px targets"
    )
    assert re.search(r'\.sidebar-nav\{[^}]*flex-direction:\s*column', mobile_css), (
        "Phone drawer panel tabs must be vertical, not horizontal"
    )
    assert re.search(r'\.sidebar-nav\s+\.nav-tab\{[^}]*min-width:\s*44px', mobile_css), (
        "Phone drawer panel tabs must be at least 44px wide"
    )
    assert re.search(r'\.sidebar-nav\s+\.nav-tab\{[^}]*min-height:\s*44px', mobile_css), (
        "Phone drawer panel tabs must be at least 44px tall"
    )
    assert re.search(r'\.sidebar\s+\.panel-view\{[^}]*height:\s*100%[^}]*margin-left:\s*52px', mobile_css), (
        "Full-screen mobile sidebar content should start beside the vertical icon strip"
    )
    assert re.search(r'\.mobile-sidebar-close\{[^}]*display:\s*inline-flex\s*!important', mobile_css), (
        "Full-screen mobile session page needs a visible close affordance"
    )
    assert re.search(r'\.sidebar\s+\.panel-icon-btn\{[^}]*min-width:\s*44px', mobile_css), (
        "Sidebar panel buttons must min-width:44px on phone"
    )
    assert re.search(r'\.sidebar\s+\.panel-icon-btn\{[^}]*min-height:\s*44px', mobile_css), (
        "Sidebar panel buttons must min-height:44px on phone"
    )
    assert re.search(r'\.sidebar\s+\.panel-icon-btn\{[^}]*width:\s*auto', mobile_css), (
        "Sidebar panel buttons must override their base 24px width on phone"
    )
    assert re.search(r'\.sidebar\s+\.panel-icon-btn\{[^}]*height:\s*auto', mobile_css), (
        "Sidebar panel buttons must override their base 24px height on phone"
    )
    assert not re.search(r'(?<!sidebar\s)\.panel-icon-btn\{[^}]*min-width:\s*44px', mobile_css), (
        "Workspace-panel header buttons must not inherit sidebar-only 44px sizing"
    )


def test_compact_titlebar_keeps_hamburger_available():
    """Compact app chrome must keep the titlebar menu reachable."""
    compact_css = "\n".join(_max_width_media_blocks(900))
    assert re.search(r'\.app-titlebar-hamburger,\s*\.app-titlebar-spacer\{[^}]*display:\s*flex', compact_css), (
        "Compact titlebar should expose the hamburger before true phone width"
    )
    assert ".rightpanel{display:none}" in compact_css.replace(" ", ""), (
        "The compact titlebar breakpoint should match the hidden workspace-panel breakpoint"
    )


def test_mobile_rail_click_opens_full_screen_panel_drawer():
    """Rail clicks on phone should keep the full-screen drawer open for panel switching."""
    panels_js = (REPO / "static" / "panels.js").read_text(encoding="utf-8")
    assert "opts.fromRailClick" in panels_js, (
        "switchPanel() should distinguish rail clicks from programmatic switches"
    )
    assert "!_isDesktopWidth()" in panels_js, (
        "Mobile rail-click sidebar handling must be limited to mobile widths"
    )
    switch_panel = panels_js.split("async function switchPanel", 1)[1].split("\n}\n\n// ── Cron panel", 1)[0]
    assert "if (opts.fromRailClick && typeof _isDesktopWidth === 'function' && !_isDesktopWidth())" in switch_panel, (
        "Missing mobile rail-click sidebar handler"
    )
    assert "sidebar.classList.remove('mobile-session-page')" in switch_panel, (
        "Phone rail clicks should leave the full-screen session page mode"
    )
    assert "sidebar.classList.add('mobile-panel-drawer', 'mobile-open')" in switch_panel, (
        "Phone rail clicks should open the panel drawer mode"
    )
    rail_handler_idx = switch_panel.index("if (opts.fromRailClick && typeof _isDesktopWidth === 'function' && !_isDesktopWidth())")
    close_sidebar_idx = switch_panel.find("closeMobileSidebar();", rail_handler_idx)
    assert close_sidebar_idx == -1, "Phone rail clicks should keep the full-screen drawer open for panel switching"
    assert "overlay.classList.add('visible')" not in switch_panel[rail_handler_idx:], (
        "Full-screen phone rail clicks should not show a backdrop that dims the PWA status bar"
    )


def test_mobile_switch_panel_non_chat_opens_sidebar():
    """mobileSwitchPanel() non-chat path should open the full-screen panel drawer."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    fn_body = _js_function_body(boot_js, "mobileSwitchPanel")
    assert "if(name==='chat')" in fn_body, (
        "mobileSwitchPanel must close sidebar only on chat target"
    )
    assert "closeMobileSidebar();" in fn_body, (
        "mobileSwitchPanel should still close sidebar on chat"
    )
    assert "sidebar.classList.add('mobile-panel-drawer','mobile-open')" in fn_body, (
        "mobileSwitchPanel non-chat branch should keep adding mobile-open"
    )
    assert "overlay.classList.add('visible')" not in fn_body, (
        "mobileSwitchPanel non-chat branch should not show a backdrop over the PWA status bar"
    )


def test_pwa_edge_swipe_opens_current_mobile_panel():
    """Left-edge swipe should open the current sidebar panel, matching hamburger."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    body = _js_function_body(boot_js, "_openMobileSidebarFromGesture")
    assert "switchPanel('chat',{bypassSettingsGuard:true})" not in body, (
        "Left-edge gesture should not force Chat; it should preserve the active panel"
    )
    assert "sidebar.classList.remove('mobile-session-page')" in body, (
        "Left-edge gesture should leave the rail-hiding session page mode"
    )
    assert "sidebar.classList.add('mobile-panel-drawer')" in body, (
        "Left-edge gesture should open the full-screen sidebar with panel rail"
    )
    assert "sidebar.classList.add('mobile-open')" in body
    assert "overlay.classList.add('visible')" not in body
    assert "_syncMobileSidebarPanelFromMainView()" in body, (
        "Left-edge gesture should sync sidebar panel from the visible detail view before opening"
    )


def test_mobile_sidebar_open_syncs_panel_from_visible_detail_view():
    """The mobile sidebar should not fall back to Chat when a module detail is visible."""
    panels_js = (REPO / "static" / "panels.js").read_text(encoding="utf-8")
    assert "const MAIN_VIEW_PANELS =" in panels_js
    main_view_panels = panels_js.split("const MAIN_VIEW_PANELS =", 1)[1].split("];", 1)[0]
    assert "'todos'" not in main_view_panels, (
        "Todos is a sidebar-only panel; adding showing-todos makes main-view sync ambiguous"
    )
    assert "const MAIN_VIEW_SIDEBAR_PANEL_FALLBACKS = { plugin: 'settings' }" in panels_js
    for panel_id in [
        "panelSettings",
        "panelSkills",
        "panelMemory",
        "panelTasks",
        "panelKanban",
        "panelWorkspaces",
        "panelProfiles",
        "panelTodos",
        "panelInsights",
        "panelLogs",
    ]:
        assert f'id="{panel_id}"' in HTML, f"{panel_id} should exist for mobile sidebar sync"
    assert 'id="panelPlugin"' not in HTML, (
        "Plugin pages are main-view only and should sync back to the Settings sidebar list"
    )
    assert "MAIN_VIEW_PANELS.forEach" in panels_js
    panel_from_view = _js_function_body(panels_js, "_panelFromCurrentMainView")
    assert "mainEl.classList.contains('showing-'+panel)" in panel_from_view
    assert "MAIN_VIEW_SIDEBAR_PANEL_FALLBACKS[panel]||panel" in panel_from_view
    assert "$('panel'+_currentPanel.charAt(0).toUpperCase()+_currentPanel.slice(1))" in panel_from_view
    assert "return 'chat'" in panel_from_view
    sync_body = _js_function_body(panels_js, "_syncMobileSidebarPanelFromMainView")
    assert "if(!panelEl)return _currentPanel||'chat'" in sync_body
    assert "_currentPanel=panel" in sync_body
    assert "document.querySelectorAll('[data-panel]')" in sync_body
    assert "document.querySelectorAll('.panel-view')" in sync_body
    assert "showing-x-" in sync_body, (
        "Mobile sidebar sync must recognize an active extension panel instead of treating it as Chat"
    )
    assert "data-panel-token" in sync_body, (
        "Mobile sidebar sync must restore the extension's matching sidebar view"
    )
    assert "const extensionPanel=`x-${extensionToken}`" in sync_body, (
        "Extension nav buttons use x- tokens and must regain their active state on mobile"
    )
    assert "_currentPanel=extensionPanel" not in sync_body, (
        "Extension tokens are not host panels and must not corrupt switchPanel's native state"
    )
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    toggle_body = _js_function_body(boot_js, "toggleMobileSidebar")
    assert "_syncMobileSidebarPanelFromMainView()" in toggle_body, (
        "Hamburger-opened mobile sidebar should also sync from the visible detail view"
    )


def test_mobile_skill_selection_closes_sidebar_after_detail_load():
    """Selecting a skill on phone should reveal the newly-loaded detail view."""
    panels_js = (REPO / "static" / "panels.js").read_text(encoding="utf-8")
    helper = _js_function_body(panels_js, "_closeMobileSidebarAfterPanelSelection")
    assert "if(typeof closeMobileSidebar!=='function')return" in helper
    assert "if(typeof _isDesktopWidth==='function'&&_isDesktopWidth())return" in helper
    assert "closeMobileSidebar()" in helper
    body = _js_function_body(panels_js, "openSkill")
    assert "_renderSkillDetail(name, data.content || '', data.linked_files || {})" in body
    assert "_closeMobileSidebarAfterPanelSelection()" in body


def test_mobile_sidebar_detail_selections_share_close_helper():
    """Sidebar list commits should consistently reveal their main detail on phone."""
    panels_js = (REPO / "static" / "panels.js").read_text(encoding="utf-8")
    for name in [
        "openCronDetail",
        "loadKanbanTask",
        "openMemorySection",
        "openWorkspaceDetail",
        "openProfileDetail",
    ]:
        body = _js_function_body(panels_js, name)
        assert "_closeMobileSidebarAfterPanelSelection()" in body, (
            f"{name} should close the full-screen mobile sidebar after opening detail"
        )
    settings_body = _js_function_body(panels_js, "switchSettingsSection")
    assert "if(opts&&opts.fromSidebarItem)_closeMobileSidebarAfterPanelSelection()" in settings_body
    assert "switchSettingsSection(_currentSettingsSection);" in panels_js
    assert "mobile-panel-drawer', 'mobile-open'" in panels_js, (
        "Opening Settings from the rail should keep the mobile drawer available"
    )
    for section in ["conversation", "appearance", "preferences", "providers", "plugins", "extensions", "system", "help"]:
        assert f"switchSettingsSection('{section}',{{fromSidebarItem:true}})" in HTML, (
            f"Settings sidebar item {section} should close after selecting its detail"
        )


def test_mobile_session_page_close_button_is_mobile_scoped():
    """The full-screen session page close button should not appear on desktop."""
    assert 'class="panel-head-btn mobile-sidebar-close' in HTML, (
        "Sidebar needs a close button for the full-screen mobile session page"
    )
    assert 'onclick="closeMobileSidebar()"' in HTML, (
        "Mobile session page close button should close the sidebar"
    )
    assert "mobile-sidebar-close{display:none" in CSS.replace(" ", ""), (
        "Mobile sidebar close button should be hidden by default"
    )
    mobile_css = "\n".join(_max_width_media_blocks(640))
    assert ".mobile-sidebar-close{display:inline-flex!important" in mobile_css.replace(" ", ""), (
        "Mobile sidebar close button should be visible in phone layout"
    )


def test_mobile_files_button_present():
    """Mobile files toggle button (#btnWorkspacePanelToggle.workspace-toggle-btn) must be in HTML and CSS."""
    assert 'id="btnWorkspacePanelToggle"' in HTML, \
        "#btnWorkspacePanelToggle missing from index.html"
    assert "workspace-toggle-btn" in CSS, \
        ".workspace-toggle-btn CSS missing from style.css"


# ── Profile dropdown overflow ─────────────────────────────────────────────────

def test_profile_dropdown_not_clipped_by_overflow():
    """Profile dropdown must not be inside an overflow:hidden or overflow-x:auto ancestor
    without a higher z-index escape hatch.

    The topbar-chips container uses overflow-x:auto on mobile, which creates a
    stacking context that clips absolutely-positioned children. The profile dropdown
    must use position:fixed on mobile OR the topbar-chips must not clip it.
    """
    # The profile-chip wrapper must have position:relative so the dropdown can escape
    assert 'id="profileChipWrap"' in HTML, \
        "#profileChipWrap missing from index.html"
    # Profile dropdown must have a z-index high enough to clear the topbar
    assert ".profile-dropdown{" in CSS or ".profile-dropdown {" in CSS, \
        ".profile-dropdown CSS rule missing"
    # z-index must be at least 200 (topbar is z-index:10)
    m = re.search(r'\.profile-dropdown\{[^}]*z-index:(\d+)', CSS)
    if m:
        assert int(m.group(1)) >= 100, \
            f".profile-dropdown z-index {m.group(1)} is too low — must be >= 100 to clear topbar"


def test_composer_dropdowns_are_not_nested_inside_left_control_row():
    """Composer dropdown surfaces should remain outside .composer-left.

    The left row can wrap/scroll on phones; dropdowns need to be siblings so
    that overflow rules on the control row cannot clip them.
    """
    parser = _ComposerLeftDropdownParser()
    parser.feed(HTML)
    assert not parser.violations, (
        "Composer dropdowns must not be nested inside .composer-left: "
        + ", ".join(parser.violations)
    )


def test_topbar_chips_mobile_overflow():
    """topbar-chips must use overflow-x:auto on mobile for chip scrolling.

    Chips (profile, workspace, model, files) must scroll horizontally on narrow
    viewports rather than wrapping onto a second line which would break the topbar layout.
    """
    # At narrow viewport, topbar-chips should scroll
    assert "overflow-x:auto" in CSS or "overflow-x: auto" in CSS, \
        "topbar-chips must have overflow-x:auto for mobile chip scrolling"


# ── Workspace panel close ─────────────────────────────────────────────────────

def test_workspace_close_button_present():
    """Workspace panel must have a close/hide button accessible on mobile."""
    # Accept handleWorkspaceClose() (two-step close: file→browse→closed), or the
    # lower-level functions directly.  handleWorkspaceClose is preferred because
    # it dismisses a file preview first before closing the panel.
    has_close = (
        'onclick="handleWorkspaceClose()"' in HTML or
        'onclick="closeWorkspacePanel()"' in HTML or
        'onclick="toggleWorkspacePanel()"' in HTML
    )
    assert has_close, \
        "handleWorkspaceClose() or closeWorkspacePanel() must be wired to a button to close the workspace panel on mobile"


def test_toggle_mobile_files_js_defined():
    """toggleMobileFiles() must be defined in boot.js."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    assert "function toggleMobileFiles()" in boot_js, \
        "toggleMobileFiles() missing from static/boot.js"
    assert "mobile-open" in boot_js, \
        "toggleMobileFiles() must toggle mobile-open class on the right panel"
    assert "function closeMobileWorkspacePanelFromChat(e)" in boot_js
    assert "$('mainChat')?.addEventListener('pointerdown', closeMobileWorkspacePanelFromChat);" in boot_js


def test_new_conversation_closes_mobile_sidebar():
    """New conversation must close the mobile drawer so the chat pane is visible immediately."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    # Handler is now multi-line — search for the full block rather than a single line.
    assert "$('btnNewChat').onclick" in boot_js, "btnNewChat onclick handler missing from static/boot.js"
    # Find the handler block and verify closeMobileSidebar appears in it.
    # The handler grew comments after #1432 (in-flight guard refactor), so use a
    # generous window to cover the full handler body.
    idx = boot_js.find("$('btnNewChat').onclick")
    handler_block = boot_js[idx:idx+1500]
    assert "closeMobileSidebar" in handler_block, \
        "btnNewChat handler must closeMobileSidebar() after creating the new session"

    shortcut_line = next((ln for ln in boot_js.splitlines() if "e.key==='k'" in ln or "e.key === 'k'" in ln), "")
    assert shortcut_line, "Cmd/Ctrl+K new chat shortcut missing from static/boot.js"
    shortcut_block = "\n".join(boot_js.splitlines()[boot_js.splitlines().index(shortcut_line):boot_js.splitlines().index(shortcut_line)+24])
    assert "closeMobileSidebar" in shortcut_block, \
        "Cmd/Ctrl+K new chat shortcut must closeMobileSidebar() after creating the new session"


def test_new_conversation_shortcut_works_while_busy():
    """Cmd/Ctrl+K should still create a new conversation while the current one is busy.

    The previous behavior gated the shortcut on !S.busy, which meant users had
    to wait for a long generation to finish before they could start something
    new — the exact moment they want to switch context.
    """
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    shortcut_line = next((ln for ln in boot_js.splitlines() if "e.key==='k'" in ln or "e.key === 'k'" in ln), "")
    assert shortcut_line, "Cmd/Ctrl+K new chat shortcut missing from static/boot.js"
    # Inspect the next 10 lines after the keybinding match — the gating block
    # would live there if it had been kept.
    idx = boot_js.splitlines().index(shortcut_line)
    shortcut_block = "\n".join(boot_js.splitlines()[idx:idx + 10])
    # Strip the existing message-count guard (which is unrelated and stays) so
    # we only check for an S.busy gate on the newSession() call itself.
    assert "if(!S.busy)" not in shortcut_block, (
        "Cmd/Ctrl+K must not be blocked by the current session's busy state"
    )
    assert "if (!S.busy)" not in shortcut_block, (
        "Cmd/Ctrl+K must not be blocked by the current session's busy state"
    )


def test_mobile_titlebar_has_new_conversation_button():
    """Mobile titlebar shows the New Conversation action and keeps it next to reload."""
    header_match = re.search(
        r'<header class="app-titlebar"[^>]*>(?P<body>.*?)</header>',
        HTML,
        re.S,
    )
    assert header_match, "app-titlebar header block missing"
    header_html = header_match.group("body")

    idx_btn = header_html.find('id="btnTitlebarNewChat"')
    idx_reload = header_html.find('id="btnReload"')
    idx_spacer = header_html.find('class="app-titlebar-spacer"')

    assert idx_btn != -1, "titlebar mobile new chat button should exist"
    assert idx_reload != -1, "titlebar reload button should remain present"
    assert idx_spacer != -1, "titlebar spacer should remain present"
    assert idx_spacer < idx_btn < idx_reload, (
        "titlebar new chat button must sit left of the reload button on mobile"
    )
    assert "btnTitlebarNewChat" in header_html
    assert "data-i18n-title=\"new_conversation\"" in header_html
    assert "data-i18n-aria-label=\"new_conversation\"" in header_html
    assert "aria-label=\"New conversation\"" in header_html
    assert "title=\"New conversation\"" in header_html
    assert "$('btnNewChat').click()" in header_html


def test_titlebar_new_chat_button_mobile_visibility_css():
    """Keep the titlebar new-chat control mobile-only and reuse reload button styling."""
    base_rule = _declarations(_rule_body(CSS, ".app-titlebar-new-chat"))
    assert base_rule.get("display") == "none", "app-titlebar new chat button must be hidden by default"
    mobile_blocks = "".join(_max_width_media_blocks(640))
    mobile_rule = _declarations(_rule_body(mobile_blocks, ".app-titlebar-new-chat"))
    assert mobile_rule.get("display") == "inline-flex", (
        "app-titlebar new chat button must be visible in mobile layout rules"
    )
    desktop_css = re.sub(
        r"@media\(max-width:640px\).*",
        "",
        CSS,
        flags=re.S,
    )
    assert ".app-titlebar-new-chat{display:inline-flex;}" not in desktop_css, (
        "titlebar new chat button must not be exposed by desktop PWA/fullscreen rules"
    )


def test_titlebar_reload_button_visibility_css_contract():
    """Keep reload hidden by default, keep standalone visibility, and expose it on mobile width."""
    base_rule = _declarations(_rule_body(CSS, ".app-titlebar-reload"))
    assert _display_hidden(base_rule), "app-titlebar reload button should stay hidden by default"

    standalone_mode_pattern = re.compile(
        r"@media\s*\(\s*display-mode:\s*standalone\s*\)\s*,\s*"
        r"\(\s*display-mode:\s*fullscreen\s*\)\s*\{"
    )
    standalone_rule_body = None
    for match in standalone_mode_pattern.finditer(CSS):
        open_brace = match.end() - 1
        depth = 0
        for idx in range(open_brace, len(CSS)):
            if CSS[idx] == "{":
                depth += 1
            elif CSS[idx] == "}":
                depth -= 1
                if depth == 0:
                    block = CSS[open_brace + 1 : idx]
                    if ".app-titlebar-reload" in block:
                        standalone_rule_body = block
                    break
        if standalone_rule_body is not None:
            break
    assert standalone_rule_body is not None, (
        "standalone/fullscreen media block for titlebar reload could not be parsed"
    )
    standalone_rule = _declarations(_rule_body(standalone_rule_body, ".app-titlebar-reload"))
    assert standalone_rule.get("display") == "inline-flex", (
        "titlebar reload should remain inline-flex in standalone/fullscreen"
    )

    mobile_blocks = "".join(_max_width_media_blocks(640))
    mobile_rule = _declarations(_rule_body(mobile_blocks, ".app-titlebar-reload"))
    assert _display_inline_flex(mobile_rule), (
        "app-titlebar reload button should be visible in phone-width titlebar rules"
    )


# ── Viewport and scroll safety ────────────────────────────────────────────────

def test_body_overflow_hidden():
    """body must have overflow:hidden to prevent double scrollbars on mobile."""
    assert "body{" in CSS or "body {" in CSS, \
        "body rule missing from style.css"
    assert re.search(r'body\{[^}]*overflow:hidden', CSS), \
        "body must have overflow:hidden to prevent double scrollbars"


def test_flex_parents_allow_message_scroller_to_shrink():
    """The top-level flex containers must opt into min-height:0 so .messages can scroll on mobile.

    Mobile Safari/Chrome can trap scroll when a flex child with overflow:auto sits inside
    parents whose min-height remains auto. Both .layout and .main need min-height:0.
    """
    assert re.search(r'\.layout\{[^}]*min-height:0', CSS), \
        ".layout must set min-height:0 so the chat column can shrink and scroll"
    assert re.search(r'\.main\{[^}]*min-height:0', CSS), \
        ".main must set min-height:0 so .messages remains scrollable while busy"


def test_messages_touch_scrolling_hints_present():
    """The messages scroller must advertise touch-friendly scrolling behavior.

    On mobile browsers, momentum scrolling and explicit pan-y/overscroll behavior help
    prevent the chat area from feeling locked while the app body itself stays overflow:hidden.
    """
    assert re.search(r'\.messages\{[^}]*-webkit-overflow-scrolling:\s*touch', CSS), \
        ".messages must enable -webkit-overflow-scrolling:touch for mobile momentum scroll"
    assert re.search(r'\.messages\{[^}]*touch-action:\s*pan-y', CSS), \
        ".messages must set touch-action:pan-y so vertical swipe gestures scroll the transcript"
    assert re.search(r'\.messages\{[^}]*overscroll-behavior-y:\s*contain', CSS), \
        ".messages must contain vertical overscroll so the transcript keeps the gesture"


def test_100dvh_viewport_height():
    """Layout must use 100dvh (dynamic viewport height) for correct mobile sizing.

    On mobile Safari and Chrome, 100vh includes the browser chrome (address bar),
    causing content to be hidden. 100dvh accounts for the actual available height.
    """
    assert "100dvh" in CSS, \
        "style.css must use 100dvh for correct mobile viewport height (100vh hides content under address bar)"


def test_viewport_disables_page_zoom_for_native_pwa_shell():
    """Installed PWA launches should not rubber-band into browser-style page zoom."""
    assert 'name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no"' in HTML


def test_pwa_safe_area_top_stays_scoped_to_installed_modes():
    """The PWA shell should not opt into cover-mode geometry for every browser surface."""
    assert 'viewport-fit=cover' not in HTML
    assert 'apple-mobile-web-app-status-bar-style" content="black-translucent"' in HTML
    assert "@media (display-mode: standalone), (display-mode: fullscreen)" in CSS
    assert "--app-titlebar-safe-top:env(safe-area-inset-top" in CSS
    assert "--app-safe-bottom:" not in CSS


def test_titlebar_safe_area_top_uses_scoped_variable():
    """The titlebar must use the safe-area variable instead of direct env()."""
    # Match the GLOBAL `.app-titlebar{...}` rule, not skin-scoped variants like
    # `:root.dark[data-skin="neon"] .app-titlebar{...}` (#3164) which can appear
    # earlier in the file. Require the selector to start the line (optionally
    # indented) with no `[data-skin=` scope prefix.
    m = re.search(r'(?m)^\s*\.app-titlebar\{(?P<body>[^}]*)\}', CSS)
    assert m, ".app-titlebar rule missing from style.css"
    rule = m.group("body")
    assert "padding-top:var(--app-titlebar-safe-top)" in rule, (
        ".app-titlebar must use the scoped safe-area variable for top padding"
    )
    assert "padding-top:env(safe-area-inset-top" not in rule, (
        ".app-titlebar must not apply env(safe-area-inset-top) directly in "
        "the base browser/webview layout"
    )


def test_safe_area_variables_available_for_pwa_shell():
    """Top safe-area variable should be available to installed PWA shell CSS."""
    assert "--app-titlebar-safe-top:0px" in CSS, (
        "titlebar top safe-area variable must default to 0px"
    )
    assert "--app-titlebar-safe-top:env(safe-area-inset-top" in CSS, (
        "CSS must expose env(safe-area-inset-top) through --app-titlebar-safe-top"
    )
    assert "padding:8px 10px calc(12px + var(--keyboard-bottom-inset, 0px))!important" in CSS, (
        "Phone composer should keep the proven pre-cover-mode padding contract"
    )


def test_pwa_startup_classes_have_native_shell_affordances():
    """The JS-startup fallback classes should mirror browser display-mode CSS.

    iOS and embedded webviews do not always evaluate display-mode media queries
    the same way as Chromium. pwa-startup.js adds classes early, so CSS should
    provide the same native-feel affordances through those classes.
    """
    assert ".pwa-standalone" in CSS
    assert ".pwa-standalone .app-titlebar-reload" in CSS
    assert "overscroll-behavior:none" in CSS
    assert ".pwa-offline .app-titlebar::after" in CSS
    assert "pwa-title-resume" in CSS


def test_composer_touch_target_size():
    """Send button and composer inputs must have minimum 44px touch targets on mobile.

    Apple HIG and Google Material guidelines both require 44px minimum touch targets.
    """
    # Check that mobile CSS doesn't make the send button smaller than 44×44
    # We check that there's at least a min-height definition for touch targets
    assert re.search(r'(min-height|height).*44px', CSS), \
        "style.css must define 44px minimum touch targets for mobile (send button, nav buttons)"


def test_mobile_composer_footer_stays_single_row():
    """Phone composer controls should stay in one footer row."""
    mobile_css = _composer_phone_media_block()

    footer = _declarations(_rule_body(mobile_css, ".composer-footer"))
    assert footer.get("flex-wrap") == "nowrap", \
        "mobile composer footer must stay visually single-row"

    left = _declarations(_rule_body(mobile_css, ".composer-left"))
    assert left.get("flex") != "1 1 100%", \
        "mobile composer-left controls must not take their own full-width row"
    assert left.get("width") != "100%", \
        "mobile composer-left controls must not span a separate row"
    assert left.get("flex-wrap") == "nowrap", \
        "mobile composer-left controls must remain in one row"

    right = _declarations(_rule_body(mobile_css, ".composer-right"))
    assert right.get("flex") != "1 1 100%", \
        "mobile composer-right actions must not take their own full-width row"
    assert right.get("width") != "100%", \
        "mobile composer-right actions must not span a separate row"
    assert right.get("justify-content") == "flex-end", \
        "mobile composer-right actions must stay end-aligned"


def test_mobile_composer_left_scrolls_horizontally_without_wrapping():
    """If many primary controls are visible, the single control row should scroll."""
    left = _declarations(_rule_body(_composer_phone_media_block(), ".composer-left"))
    assert left.get("overflow-x") == "auto", \
        "mobile composer-left must allow horizontal overflow in the single row"
    assert left.get("overflow-y") == "hidden", \
        "mobile composer-left must not create a second vertical control row"
    assert left.get("max-height") == "none", \
        "mobile composer-left must not preserve the old bounded two-row height"


def test_mobile_composer_left_children_do_not_shrink_into_each_other():
    """Phone composer controls must scroll or compact, never shrink/overlap siblings."""
    mobile_css = _composer_phone_media_block()
    left = _declarations(_rule_body(mobile_css, ".composer-left"))
    assert left.get("gap") == "10px", \
        "mobile composer-left needs explicit spacing between 44px touch targets"

    children = _declarations(_rule_body(mobile_css, ".composer-left > *"))
    assert children.get("flex-shrink") == "0", \
        "mobile composer-left children must not shrink and visually overlap"

    for selector in (
        ".composer-profile-wrap",
        ".composer-ws-wrap",
    ):
        declarations = _declarations(_rule_body(mobile_css, selector))
        assert declarations.get("flex") == "0 0 auto", \
            f"{selector} must opt out of flex shrinking on phones"

    workspace_group = _declarations(_rule_body(mobile_css, ".composer-workspace-group"))
    assert workspace_group.get("flex") == "0 0 44px", \
        ".composer-workspace-group must reserve exactly one 44px slot on phones"


def test_legacy_320px_composer_tightens_spacing_without_shrinking_targets():
    """At 320px, keep 44px controls but use smaller gutters so config stays visible."""
    narrow_blocks = [block for block in _max_width_media_blocks(340) if ".composer-left" in block]
    assert narrow_blocks, "Missing 320px/legacy-phone composer spacing override"
    narrow_css = narrow_blocks[0]

    footer = _declarations(_rule_body(narrow_css, ".composer-footer"))
    left = _declarations(_rule_body(narrow_css, ".composer-left"))
    wrap = _declarations(_rule_body(narrow_css, ".composer-wrap"))

    assert footer.get("gap") == "4px", \
        "320px footer should tighten only the gutter between left controls and send"
    assert left.get("gap") == "2px", \
        "320px left controls need compact gutters to fit config before the fixed send button"
    assert wrap.get("padding-left") == "8px!important", \
        "320px composer should reclaim a little side padding without shrinking touch targets"
    assert ".send-btn{width:44px;height:44px;" in _composer_phone_media_block(), \
        "narrow spacing override must not shrink the 44px send button"
    assert ".composer-mobile-config-btn{box-sizing:border-box;position:relative;display:inline-flex!important;width:44px;height:44px" in _composer_phone_media_block(), \
        "narrow spacing override must not shrink the 44px mobile config button"


def test_mobile_composer_workspace_switch_does_not_leave_empty_icon_slot():
    """The phone footer should keep only the useful workspace files button inline."""
    mobile_css = _composer_phone_media_block()
    workspace_group = _declarations(_rule_body(mobile_css, ".composer-workspace-group"))
    workspace_files = _declarations(_rule_body(mobile_css, ".composer-workspace-files-btn"))
    workspace_chip = _declarations(_rule_body(mobile_css, ".composer-workspace-chip"))

    assert workspace_group.get("max-width") == "44px", \
        "workspace group should collapse to one 44px files button on phones"
    assert workspace_group.get("width") == "44px", \
        "workspace group should have an exact border-box phone width"
    assert workspace_group.get("box-sizing") == "border-box", \
        "workspace group must use border-box for its 44px phone slot"
    assert workspace_group.get("border") == "none", \
        "workspace files shortcut should not keep the desktop pill/circle border on phones"
    assert workspace_group.get("background") == "transparent", \
        "workspace files shortcut should visually match other transparent mobile icon buttons"
    assert workspace_files.get("max-width") == "44px", \
        "workspace files button should be the only visible workspace footer target on phones"
    assert workspace_files.get("width") == "44px", \
        "workspace files button should have an exact border-box phone width"
    assert workspace_files.get("box-sizing") == "border-box", \
        "workspace files button must not grow beyond its 44px phone slot due to padding"
    assert workspace_chip.get("display") == "none!important", \
        "workspace switch chip has no visible mobile label/icon and must not consume a blank slot"


def test_mobile_composer_overflow_control_present():
    """Phone composer must expose a compact overflow/settings control."""
    assert 'id="composerMobileConfigBtn"' in HTML, \
        "#composerMobileConfigBtn missing from index.html"
    assert 'id="composerMobileConfigPanel"' in HTML, \
        "#composerMobileConfigPanel missing from index.html"
    assert 'aria-controls="composerMobileConfigPanel"' in HTML, \
        "mobile config button must be associated with its panel"
    left_start = HTML.index('<div class="composer-left">')
    left_end = HTML.index('<div class="composer-right">', left_start)
    assert 'id="composerMobileConfigPanel"' not in HTML[left_start:left_end], \
        "mobile overflow panel must not be nested inside .composer-left where overflow can clip it"
    assert "function toggleMobileComposerConfig()" in (REPO / "static" / "ui.js").read_text(encoding="utf-8"), \
        "toggleMobileComposerConfig() must be defined in static/ui.js"

    mobile_css = _composer_phone_media_block()
    btn = _declarations(_rule_body(mobile_css, ".composer-mobile-config-btn"))
    panel = _declarations(_rule_body(CSS, ".composer-mobile-config-panel"))
    panel_open = _declarations(_rule_body(mobile_css, ".composer-mobile-config-panel.open"))
    assert btn.get("display") == "inline-flex!important", \
        "mobile overflow button must be visible at phone width"
    assert panel.get("display") == "none", \
        "mobile overflow panel should be closed by default"
    assert panel.get("position") == "absolute", \
        "mobile overflow panel should open above the composer footer"
    assert panel.get("flex-wrap") == "wrap", \
        "mobile overflow panel must allow the context details row to span below primary actions"
    assert panel_open.get("display") == "flex", \
        "mobile overflow panel must become visible when opened"


def test_model_and_reasoning_controls_live_in_mobile_overflow_panel():
    """Model and reasoning controls must remain reachable through the phone overflow."""
    panel_start = HTML.index('id="composerMobileConfigPanel"')
    panel_end = HTML.index('<div class="profile-dropdown"', panel_start)
    panel_html = HTML[panel_start:panel_end]
    assert 'id="composerMobileModelAction"' in panel_html, \
        "mobile model action must be inside the overflow panel"
    assert 'id="composerMobileQuotaAction"' in panel_html, \
        "mobile quota action must be inside the overflow panel"
    assert 'id="composerMobileReasoningAction"' in panel_html, \
        "mobile reasoning action must be inside the overflow panel"
    assert 'onclick="toggleModelDropdown()"' in panel_html, \
        "mobile model action must reuse the existing model dropdown"
    assert 'onclick="toggleReasoningDropdown()"' in panel_html, \
        "mobile reasoning action must reuse the existing reasoning dropdown"
    assert 'id="composerMobileModelLabel"' in panel_html, \
        "mobile model action must expose the selected model label"
    assert 'id="composerMobileQuotaLabel"' in panel_html, \
        "mobile quota action must expose the selected quota label"
    assert 'id="composerMobileReasoningLabel"' in panel_html, \
        "mobile reasoning action must expose the selected reasoning label"
    ui_js = (REPO / "static" / "ui.js").read_text(encoding="utf-8")
    assert "composerMobileModelAction" in ui_js, \
        "model dropdown positioning/click handling must know the mobile model action"
    assert "composerMobileQuotaAction" in ui_js, \
        "quota sync must know the mobile quota action"
    assert "composerMobileReasoningAction" in ui_js, \
        "reasoning dropdown positioning/click handling must know the mobile reasoning action"

    mobile_css = _composer_phone_media_block()
    assert ".composer-left > .composer-model-wrap" in mobile_css, \
        "phone width must hide the footer model chip behind overflow"
    assert ".composer-left > .composer-reasoning-wrap" in mobile_css, \
        "phone width must hide the footer reasoning chip behind overflow"
    assert ".composer-mobile-config-action" in mobile_css, \
        "mobile overflow panel must size the model/reasoning actions"


def test_mobile_overflow_panel_quota_order_matches_desktop_sequence():
    """The mobile overflow panel should keep the same shared control order as desktop."""
    panel_start = HTML.index('id="composerMobileConfigPanel"')
    panel_end = HTML.index('<div class="profile-dropdown"', panel_start)
    panel_html = HTML[panel_start:panel_end]
    workspace_idx = panel_html.index('id="composerMobileWorkspaceAction"')
    model_idx = panel_html.index('id="composerMobileModelAction"')
    quota_idx = panel_html.index('id="composerMobileQuotaAction"')
    reasoning_idx = panel_html.index('id="composerMobileReasoningAction"')
    context_idx = panel_html.index('id="composerMobileContextAction"')
    assert workspace_idx < model_idx < quota_idx < reasoning_idx < context_idx, \
        "mobile control order should mirror the desktop/shared control sequence"


def test_model_and_reasoning_dropdowns_use_mobile_panel_anchors():
    """Model/reasoning dropdowns must anchor to mobile actions while the overflow is open."""
    ui_js = (REPO / "static" / "ui.js").read_text(encoding="utf-8")
    model_start = ui_js.index("function _positionModelDropdown()")
    model_end = ui_js.index("function renderModelDropdown()", model_start)
    model_body = ui_js[model_start:model_end]
    for expected in (
        "composerMobileConfigPanel",
        "composerMobileModelAction",
        "classList.contains('open')",
    ):
        assert expected in model_body, \
            f"_positionModelDropdown must keep mobile-panel anchor logic ({expected})"

    reasoning_start = ui_js.index("function _positionReasoningDropdown()")
    reasoning_end = ui_js.index("function closeReasoningDropdown()", reasoning_start)
    reasoning_body = ui_js[reasoning_start:reasoning_end]
    for expected in (
        "composerMobileConfigPanel",
        "composerMobileReasoningAction",
        "classList.contains('open')",
    ):
        assert expected in reasoning_body, \
            f"_positionReasoningDropdown must keep mobile-panel anchor logic ({expected})"


def test_context_details_live_in_mobile_overflow_panel():
    """Context details should be reachable in overflow without adding a composer slot."""
    panel_start = HTML.index('id="composerMobileConfigPanel"')
    panel_end = HTML.index('<div class="profile-dropdown"', panel_start)
    panel_html = HTML[panel_start:panel_end]
    for element_id in (
        "composerMobileContextAction",
        "composerMobileContextUsage",
        "composerMobileContextTokens",
        "composerMobileContextThreshold",
        "composerMobileContextCost",
        "composerMobileCtxCompressBtn",
    ):
        assert f'id="{element_id}"' in panel_html, \
            f"#{element_id} must be inside the mobile overflow panel"

    right_start = HTML.index('<div class="composer-right">', HTML.index('<div class="composer-footer">'))
    right_end = HTML.index('<div class="composer-mobile-config-panel"', right_start)
    right_html = HTML[right_start:right_end]
    assert 'id="composerMobileContextAction"' not in right_html, \
        "mobile context details must not live in composer-right as another phone slot"
    assert 'id="composerMobileCtxBadge"' not in right_html, \
        "mobile context badge must stay on the config button, not composer-right"

    ui_js = (REPO / "static" / "ui.js").read_text(encoding="utf-8")
    sync_start = ui_js.index("function _syncMobileCtxDisplay(state)")
    sync_end = ui_js.index("// ── Touch support", sync_start)
    sync_body = ui_js[sync_start:sync_end]
    for expected in (
        "DEFAULT_CTX=128*1024",
        "hasExplicitCtx",
        "hasPromptTok",
        "rawPct",
        "overflowed",
        "composerMobileContextUsage",
        "composerMobileContextTokens",
        "composerMobileCtxCompressBtn",
    ):
        assert expected in sync_body, \
            f"_syncCtxIndicator must preserve upstream context logic while updating mobile context UI ({expected})"

    mobile_css = _composer_phone_media_block()
    ctx_wrap = _declarations(_rule_body(mobile_css, ".ctx-indicator-wrap"))
    assert ctx_wrap.get("display") == "none!important", \
        "standalone context indicator must remain hidden from the phone composer row"

    context_row = _declarations(_rule_body(CSS, ".composer-mobile-context-action"))
    assert context_row.get("flex") == "1 0 100%", \
        "mobile context details should span the overflow panel instead of crowding the action row"
    context_button = _declarations(_rule_body(CSS, ".composer-mobile-context-compress"))
    assert context_button.get("width") == "auto", \
        "mobile compress affordance should be compact inside the context row"


def test_context_indicator_click_opens_shared_mobile_config_menu():
    """The desktop context ring should open the same menu used by phone mode."""
    ui_js = (REPO / "static" / "ui.js").read_text(encoding="utf-8")
    assert "function openMobileComposerConfig()" in ui_js, \
        "mobile config open path should be reusable outside the phone button"
    assert "function openComposerContextMenu(e)" in ui_js, \
        "context indicator needs a named click path into the shared config menu"

    context_menu_body = _js_function_body(ui_js, "openComposerContextMenu")
    for expected in (
        "e.preventDefault()",
        "e.stopPropagation()",
        "ctxTooltip",
        "openMobileComposerConfig()",
    ):
        assert expected in context_menu_body, \
            f"context click should open the shared menu without leaving tooltip state behind ({expected})"

    assert "btn.addEventListener('click',openComposerContextMenu)" in ui_js, \
        "context indicator click must open the shared composer config menu"

    panel_open = _declarations(_rule_body(CSS, ".composer-mobile-config-panel.open"))
    assert panel_open.get("display") == "flex", \
        "the shared composer config panel must be displayable when opened outside phone CSS"


def test_workspace_control_lives_in_mobile_overflow_panel():
    """Workspace switching must stay reachable even when the inline switch chip is hidden."""
    panel_start = HTML.index('id="composerMobileConfigPanel"')
    panel_end = HTML.index('<div class="profile-dropdown"', panel_start)
    panel_html = HTML[panel_start:panel_end]
    assert 'id="composerMobileWorkspaceAction"' in panel_html, \
        "mobile workspace action must be inside the overflow panel"
    assert 'onclick="toggleComposerWsDropdown()"' in panel_html, \
        "mobile workspace action must reuse the existing workspace dropdown"
    assert 'id="composerMobileWorkspaceLabel"' in panel_html, \
        "mobile workspace action must expose the current workspace label"

    mobile_css = _composer_phone_media_block()
    workspace_chip = _declarations(_rule_body(mobile_css, ".composer-workspace-chip"))
    assert workspace_chip.get("display") == "none!important", \
        "inline workspace switch chip must remain hidden on phones"

    panels_js = (REPO / "static" / "panels.js").read_text(encoding="utf-8")
    pos_start = panels_js.index("function _positionComposerWsDropdown()")
    pos_end = panels_js.index("function _positionProfileDropdown()", pos_start)
    position_body = panels_js[pos_start:pos_end]
    assert "composerMobileWorkspaceAction" in position_body, \
        "workspace dropdown positioning must know the mobile workspace action"
    assert "composerMobileConfigPanel" in position_body, \
        "workspace dropdown positioning must anchor to the mobile panel action while open"
    assert "anchor to #composerMobileWorkspaceAction" in position_body, \
        "workspace dropdown positioning should document the mobile-panel anchor choice"

    toggle_start = panels_js.index("function toggleComposerWsDropdown()")
    toggle_end = panels_js.index("function closeWsDropdown()", toggle_start)
    toggle_body = panels_js[toggle_start:toggle_end]
    assert "usingMobileAction" in toggle_body and "chip.disabled" in toggle_body, \
        "mobile workspace action must bypass only the hidden/disabled desktop chip guard"
    assert "!e.target.closest('#composerMobileWorkspaceAction')" in panels_js, \
        "workspace dropdown click-away handling must include the mobile workspace action"

    ui_js = (REPO / "static" / "ui.js").read_text(encoding="utf-8")
    assert "e.target.closest('#composerWsDropdown')" in ui_js, \
        "mobile overflow click-away handling must allow interaction with the workspace dropdown"


def test_mobile_config_panel_escape_closes_panel_and_dropdowns():
    """Escape should close mobile overflow state without touching desktop-only dropdowns."""
    ui_js = (REPO / "static" / "ui.js").read_text(encoding="utf-8")
    keydown_start = ui_js.index("document.addEventListener('keydown',function(e){", ui_js.index("function toggleMobileComposerConfig()"))
    keydown_end = ui_js.index("\n});", keydown_start)
    keydown_body = ui_js[keydown_start:keydown_end]
    assert "e.key!=='Escape'" in keydown_body, \
        "mobile config Escape handler must only handle Escape"
    assert "composerMobileConfigPanel" in keydown_body, \
        "mobile config Escape handler must look up the mobile config panel"
    assert "classList.contains('open')" in keydown_body, \
        "mobile config Escape handler must be gated on the open mobile panel"
    for expected in (
        "closeMobileComposerConfig()",
        "closeWsDropdown",
        "closeModelDropdown()",
        "closeReasoningDropdown()",
    ):
        assert expected in keydown_body, \
            f"mobile config Escape handler must close related state ({expected})"


def test_reasoning_chip_updates_desktop_and_mobile_controls():
    """Reasoning chip sync should keep both footer and mobile overflow labels current."""
    ui_js = (REPO / "static" / "ui.js").read_text(encoding="utf-8")
    chip_start = ui_js.index("function _applyReasoningChip(eff)")
    chip_end = ui_js.index("function fetchReasoningChip(", chip_start)
    chip_body = ui_js[chip_start:chip_end]
    for expected in (
        "composerReasoningWrap",
        "composerMobileReasoningAction",
        "composerReasoningLabel",
        "composerMobileReasoningLabel",
        "label.textContent=text",
        "mobileLabel.textContent=text",
    ):
        assert expected in chip_body, \
            f"_applyReasoningChip must update desktop and mobile reasoning UI ({expected})"


def test_mobile_config_kickers_have_i18n_fallbacks():
    """Mobile overflow kicker labels should be localizable without losing HTML fallback text."""
    panel_start = HTML.index('id="composerMobileConfigPanel"')
    panel_end = HTML.index('<div class="profile-dropdown"', panel_start)
    panel_html = HTML[panel_start:panel_end]
    i18n_js = (REPO / "static" / "i18n.js").read_text(encoding="utf-8")
    en_start = i18n_js.index("  en: {")
    en_end = i18n_js.index("\n  ru: {", en_start)
    english = i18n_js[en_start:en_end]
    for key, label in (
        ("composer_mobile_workspace", "Workspace"),
        ("composer_mobile_model", "Model"),
        ("composer_mobile_quota", "Quota"),
        ("composer_mobile_reasoning", "Reasoning"),
        ("composer_mobile_context", "Context"),
    ):
        assert f'data-i18n="{key}">{label}</span>' in panel_html, \
            f"mobile panel kicker {label} must keep data-i18n and fallback text"
        assert f"{key}: '{label}'" in english, \
            f"English locale must define {key}"


def test_mobile_composer_primary_controls_keep_touch_friendly_sizing():
    """Visible phone composer controls and overflow controls must keep 44px targets."""
    mobile_css = _composer_phone_media_block()
    for selector in (
        ".composer-mobile-config-btn",
        ".composer-profile-chip",
        ".composer-mobile-config-action",
    ):
        declarations = _declarations(_rule_body(mobile_css, selector))
        assert declarations.get("box-sizing") == "border-box", \
            f"{selector} must use border-box so padding/border cannot exceed 44px"
        assert declarations.get("min-height") == "44px", \
            f"{selector} must keep a 44px minimum height on phones"
        if selector != ".composer-mobile-config-action":
            assert declarations.get("min-width") == "44px", \
                f"{selector} must keep a 44px minimum width on phones"

    send = _declarations(_rule_body(mobile_css, ".send-btn"))
    assert send.get("width") == "44px", ".send-btn must keep 44px width on phones"
    assert send.get("height") == "44px", ".send-btn must keep 44px height on phones"

    ctx_wrap = _declarations(_rule_body(mobile_css, ".ctx-indicator-wrap"))
    assert ctx_wrap.get("display") == "none!important", \
        "context indicator must not add a late-appearing composer-right slot on phones"

    # #3062 replaced the old text badge (composerMobileCtxBadge / .composer-mobile-ctx-badge)
    # with an SVG context-usage ring overlaid on the config button. The invariant is the
    # same: the ring is a visual indicator hosted ON the 44px config button (whose sizing is
    # asserted above), and it must not steal/shrink that touch target. The ring SVG is
    # aria-hidden and uses currentColor; it carries no pointer events of its own.
    assert 'id="composerMobileCtxRing"' in HTML, \
        "mobile context-usage ring element must exist in the composer config button"
    assert 'id="composerMobileCtxBadge"' not in HTML, \
        "old text badge should be fully replaced by the ring, not left dangling"
    # Locate the ring's markup and confirm it does not become an interactive/sized control
    # that would compete with the config button's 44px target.
    _ring_idx = HTML.find('id="composerMobileCtxRing"')
    _ring_tag = HTML[HTML.rfind("<", 0, _ring_idx):HTML.find(">", _ring_idx) + 1]
    assert "aria-hidden" in _ring_tag, \
        "the context ring is decorative overlay — it must be aria-hidden so it doesn't steal the config button's role/touch target"

    icon_btn = _declarations(_rule_body(mobile_css, ".icon-btn"))
    assert icon_btn.get("min-width") == "44px", \
        ".icon-btn controls such as attach/mic must keep 44px minimum width on phones"
    assert icon_btn.get("min-height") == "44px", \
        ".icon-btn controls such as attach/mic must keep 44px minimum height on phones"

    if ".composer-workspace-files-btn" in mobile_css:
        files_btn = _declarations(_rule_body(mobile_css, ".composer-workspace-files-btn"))
        workspace_group = _declarations(_rule_body(mobile_css, ".composer-workspace-group"))
        assert files_btn.get("min-width") == "44px", \
            ".composer-workspace-files-btn must keep a 44px minimum width on phones"
        assert workspace_group.get("min-height") == "44px", \
            ".composer-workspace-group must preserve 44px touch height on phones"


# ── Input zoom prevention ─────────────────────────────────────────────────────

def test_composer_textarea_font_size_mobile():
    """Composer textarea must have font-size >= 16px on mobile.

    iOS Safari zooms the viewport when an input with font-size < 16px is focused,
    which breaks the layout. The composer textarea must be >= 16px at mobile widths.
    """
    # Check for 16px font-size on the textarea in a mobile breakpoint
    assert re.search(r'font-size:16px', CSS), \
        "Composer textarea must have font-size:16px at mobile widths to prevent iOS zoom-on-focus"


def test_touch_device_inputs_meet_zoom_threshold():
    """All input/textarea/select must clear iOS Safari's 16px zoom threshold
    on touch-primary devices, not just the composer textarea (#1167).

    This locks the global media-query floor so future per-element font-size
    tweaks (sidebar search 13px, settings selects 12px, dialog inputs 14px,
    onboarding fields 13px) cannot accidentally re-introduce auto-zoom.
    """
    # The hover:none + pointer:coarse pair is the canonical touch-primary
    # detection (won't match desktop with mouse, won't match touch laptops
    # that report hover:hover).
    pattern = re.compile(
        r'@media\s*\(hover:none\)\s*and\s*\(pointer:coarse\)\s*\{[^}]*'
        r'input\s*,\s*textarea\s*,\s*select\s*\{[^}]*'
        r'font-size:\s*max\(\s*16px',
        re.DOTALL,
    )
    assert pattern.search(CSS), (
        "style.css must contain a (hover:none) and (pointer:coarse) media "
        "query that bumps input/textarea/select to font-size:max(16px,…) "
        "so iOS Safari does not auto-zoom on focus (#1167)"
    )


def test_touch_keyboard_inset_uses_touch_primary_media_query():
    """The keyboard inset path must key off touch-primary media queries."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    assert "function _isTouchKeyboardViewport()" in boot_js, \
        "boot.js must define a touch-keyboard viewport predicate"
    assert "matchMedia('(hover:none) and (pointer:coarse)')" in boot_js or \
        'matchMedia("(hover:none) and (pointer:coarse)")' in boot_js, \
        "touch keyboard inset eligibility must use the hover:none + pointer:coarse media query"
    assert "any-pointer:fine" in boot_js, \
        "touch keyboard inset eligibility must exclude co-existing fine-pointer setups"
    assert "!_hasFinePointerCoexisting()" in boot_js, \
        "touch keyboard inset eligibility must skip hardware-keyboard/trackpad devices"


def test_touch_keyboard_inset_writes_and_clears_css_variable():
    """visualViewport geometry must write and clear the keyboard inset variable."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    assert "setProperty('--keyboard-bottom-inset'" in boot_js, \
        "boot.js must write --keyboard-bottom-inset on touch keyboard viewport changes"
    assert "removeProperty('--keyboard-bottom-inset')" in boot_js, \
        "boot.js must clear --keyboard-bottom-inset when the inset is zero or ineligible"
    assert "Math.max(0,Math.ceil(window.innerHeight-(vv.height+vv.offsetTop)))" in boot_js, \
        "boot.js must compute the bottom inset from innerHeight and visualViewport geometry"


def test_touch_keyboard_inset_ignores_pinch_zoom_scale():
    """A pinch-zoomed viewport (vv.scale != 1) must not be read as keyboard
    occlusion — otherwise Chromium 'force enable zoom' produces a large spurious
    inset that jitters on pan (#5738 UX-gate hardening)."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    assert "vv.scale" in boot_js, \
        "boot.js must consult visualViewport.scale before treating shrinkage as keyboard occlusion"
    assert "Math.abs((vv.scale||1)-1)>0.05" in boot_js, \
        "boot.js must bail out of the inset when the viewport is pinch-zoomed"


def test_touch_keyboard_inset_primes_during_visual_viewport_setup():
    """The existing visualViewport setup path must prime the inset immediately."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    setup_start = boot_js.index("if(window.visualViewport){")
    setup_end = boot_js.index("window.visualViewport.addEventListener('resize'", setup_start)
    setup_block = boot_js[setup_start:setup_end]
    assert "_syncKeyboardBottomInset();" in setup_block, \
        "boot.js must sync the keyboard inset once during visualViewport setup"


def test_touch_keyboard_inset_primes_on_pageshow_restore():
    """BFCache restore must resync the inset before restore work continues."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    pageshow_start = boot_js.index("window.addEventListener('pageshow'")
    pageshow_end = boot_js.index("const _srch = document.getElementById('sessionSearch');", pageshow_start)
    pageshow_block = boot_js[pageshow_start:pageshow_end]
    assert "_syncKeyboardBottomInset();" in pageshow_block, \
        "boot.js must sync the keyboard inset during pageshow restore"


def test_touch_keyboard_inset_applies_to_composer_padding():
    """Touch/coarse composer padding must consume the keyboard inset variable."""
    css_ns = re.sub(r'\s+', '', CSS)
    assert "@media(hover:none)and(pointer:coarse)" in css_ns, \
        "style.css must scope the keyboard inset padding to touch-primary viewports"
    assert ".composer-wrap{padding-bottom:calc(14px+var(--keyboard-bottom-inset,0px));}" in css_ns, \
        "style.css must add the keyboard inset to composer bottom padding"



# ── Sidebar tabs on mobile ───────────────────────────────────────────────────

def test_profiles_sidebar_tab_present():
    """Sidebar tab strip must include Profiles."""
    # Tolerate additional utility classes (e.g. `has-tooltip` from #1775).
    # We just need a nav-tab classed button targeting the profiles panel.
    import re
    pattern = r'class="[^"]*\bnav-tab\b[^"]*"[^>]*data-panel="profiles"'
    assert re.search(pattern, HTML), \
        "Sidebar nav must have a nav-tab button with data-panel=\"profiles\""


def test_mobile_bottom_nav_removed():
    """The old fixed mobile bottom nav should not be present anymore."""
    assert "mobile-bottom-nav" not in HTML, \
        "mobile-bottom-nav markup should be removed from index.html"
    assert "mobile-bottom-nav" not in CSS, \
        "mobile-bottom-nav CSS should be removed from style.css"


# ── Mobile Enter key inserts newline (PR #315, fixes #269) ───────────────────

def test_mobile_enter_newline_condition_present():
    """boot.js keydown handler must detect touch-primary devices via pointer:coarse."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    assert "pointer:coarse" in boot_js, \
        "boot.js must use pointer:coarse media query for mobile Enter detection"


def test_mobile_enter_newline_uses_match_media():
    """boot.js must call matchMedia for pointer detection, not a hardcoded flag."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    assert "matchMedia('(pointer:coarse)')" in boot_js or 'matchMedia("(pointer:coarse)")' in boot_js, \
        "boot.js must use matchMedia('(pointer:coarse)') for mobile detection"


def test_mobile_enter_newline_does_not_depend_on_viewport_heuristic():
    """The viewport-shrink heuristic was unreliable on iOS/Android and must be gone."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    assert "function _isVirtualKeyboardLikelyOpen()" not in boot_js, \
        "the unreliable visualViewport keyboard heuristic function must be removed"
    assert "&&_isVirtualKeyboardLikelyOpen()" not in boot_js, \
        "the mobile Enter override must no longer call the viewport heuristic"
    assert "window.innerHeight-vv.height>120" not in boot_js, \
        "the viewport height-delta probe must no longer gate the mobile Enter override"


def test_mobile_enter_newline_only_overrides_enter_default():
    """Mobile newline override must only apply when _sendKey is the default 'enter'."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    # The _mobileDefault check must gate on _sendKey==='enter' so ctrl+enter users aren't affected
    assert "_sendKey===" in boot_js and "'enter'" in boot_js, \
        "Mobile newline fallback must check window._sendKey==='enter' to avoid overriding user preference"


def test_mobile_enter_does_not_affect_desktop_logic():
    """The mobile Enter override must not alter the existing else branch for desktop users."""
    boot_js = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
    # The else branch (desktop, sends on Enter without Shift) must still be present
    assert "if(!e.shiftKey){e.preventDefault();send();" in boot_js, \
        "Desktop Enter-to-send logic (else branch) must still be present in boot.js"