From 888a8c380a1ec01b9780e95312099c9bc1d1d0da Mon Sep 17 00:00:00 2001
From: Jim Lancaster <40281233+zoltan57@users.noreply.github.com>
Date: Tue, 11 Aug 2026 16:54:03 -0500
Subject: [PATCH] Continue GC code review: UI

---
 .github/instructions/ui.instructions.md       |   6 +-
 docs/invariant/ui_style_guide.md              |  16 +-
 src/transcription/ui/components/app_shell.py  |   7 +-
 .../ui/components/data_display.py             |   2 +-
 .../ui/components/document_panzoom.py         |  48 +-----
 .../ui/components/error_presenter.py          |   2 +-
 .../ui/components/table/common.py             |   7 +-
 .../ui/components/table/documents.py          |  11 +-
 src/transcription/ui/components/table/jobs.py |  20 +--
 .../ui/components/table/sources.py            |  13 +-
 src/transcription/ui/components/transcript.py |  19 +--
 src/transcription/ui/components/viewers.py    |  11 +-
 src/transcription/ui/static/theme.css         | 161 ++++++++++++------
 tests/test_ui_theme.py                        |  45 +++++
 14 files changed, 205 insertions(+), 163 deletions(-)

diff --git a/.github/instructions/ui.instructions.md b/.github/instructions/ui.instructions.md
index c72749d..9cb8528 100644
--- a/.github/instructions/ui.instructions.md
+++ b/.github/instructions/ui.instructions.md
@@ -40,10 +40,10 @@ Pages may depend on application services and framework-provided dependencies. Co
 
 ## CSS Assets
 
-- Keep CSS under `ui/static` and split it into manageable, feature-oriented files. Do not grow a monolithic stylesheet or embed substantial style blocks in Python components.
-- Load each stylesheet from the page, component, or composition root that needs it with `ui.add_css(...)`. Use shared registration only for genuinely application-wide styles.
+- Keep all application CSS in `ui/static/theme.css`; do not add page- or component-specific stylesheets or embed style blocks in Python components.
+- Load `theme.css` once from the composition root with `ui.add_css(..., shared=True)`.
 - Read stylesheet text through `importlib.resources.files(...)` so loading works from installed packages and is independent of the working directory.
-- Centralize CSS reading in one typed helper cached by relative resource path with `functools.cache` or an equivalent unbounded `lru_cache`. Cache the immutable stylesheet text to avoid repeated resource I/O during component renders; keep NiceGUI registration decisions at the caller.
+- Centralize CSS reading in one typed helper cached by resource path with `functools.cache` or an equivalent unbounded `lru_cache`. Cache the immutable stylesheet text to avoid repeated resource I/O; keep NiceGUI registration at the composition root.
 - Do not encode application behavior in CSS or other static assets.
 
 ## State and Side Effects
diff --git a/docs/invariant/ui_style_guide.md b/docs/invariant/ui_style_guide.md
index 84eeda7..54d63d6 100644
--- a/docs/invariant/ui_style_guide.md
+++ b/docs/invariant/ui_style_guide.md
@@ -65,12 +65,16 @@ Semantic tokens currently include:
 4. ui-card-surface
 5. ui-row-surface
 6. ui-note-box
+7. ui-card-error
 
 ### 5.3 Interactive Elements
 1. ui-btn-primary
 2. ui-btn-secondary
 3. ui-link-primary
 4. ui-text-accent
+5. ui-chip-primary
+6. ui-badge-secondary
+7. ui-status and ui-status--<status>
 
 ### 5.4 Table Patterns
 1. ui-table
@@ -80,21 +84,15 @@ Semantic tokens currently include:
 Use existing class combinations from [src/transcription/ui/components](src/transcription/ui/components) and [src/transcription/ui/pages](src/transcription/ui/pages) as reference implementations.
 
 ## 6. Legacy Class Policy
-Legacy classes with vibe- prefix still exist in a few components and are allowed only for compatibility while migrating:
-1. Existing usage may remain temporarily.
-2. New usage of vibe- classes is not allowed.
-3. When touching a file that uses vibe- classes, prefer migrating it to ui- semantic classes in the same change when safe.
-
-Current legacy usage examples are in:
-1. [src/transcription/ui/components/document_panzoom.py](src/transcription/ui/components/document_panzoom.py)
-2. [src/transcription/ui/components/error_presenter.py](src/transcription/ui/components/error_presenter.py)
-3. [src/transcription/ui/components/transcript.py](src/transcription/ui/components/transcript.py)
+Legacy `vibe-` presentation classes are prohibited. Use `ui-` semantic classes from `theme.css`.
 
 ## 7. Prohibited Patterns
 1. Inline hex colors in Python UI class strings or style blocks, except in isolated bridge code explicitly marked for migration.
 2. Ad-hoc one-off class names that duplicate existing semantic class intent.
 3. Page-specific palette forks that bypass theme tokens.
 4. Hidden or low-contrast focus states on interactive controls.
+5. Embedded `<style>` blocks or NiceGUI `.style(...)` calls in Python UI code.
+6. Additional page- or component-specific stylesheets; `theme.css` is the single CSS source.
 
 ## 8. Implementation Rules For Contributors
 1. Prefer composing existing semantic classes before creating new ones.
diff --git a/src/transcription/ui/components/app_shell.py b/src/transcription/ui/components/app_shell.py
index 9595b6a..e6584e8 100644
--- a/src/transcription/ui/components/app_shell.py
+++ b/src/transcription/ui/components/app_shell.py
@@ -4,6 +4,8 @@ from __future__ import annotations
 
 from nicegui import ui
 
+from transcription.ui.theme import VIBESCRIBE_LOGO_SVG
+
 NAV_ITEMS: tuple[tuple[str, str, str], ...] = (
     ("Documents", "/documents", "description"),
     ("People", "/people", "group"),
@@ -11,7 +13,6 @@ NAV_ITEMS: tuple[tuple[str, str, str], ...] = (
     ("Jobs", "/jobs", "work_history"),
 )
 
-from transcription.ui.theme import VIBESCRIBE_LOGO_SVG
 
 def _is_active_path(*, current_path: str, item_path: str) -> bool:
     if item_path == "/jobs":
@@ -50,9 +51,7 @@ def render_app_shell(*, current_path: str | None = None) -> None:
     normalized_path = _normalize_path(current_path)
 
     with ui.header().classes("app-shell"), ui.element("div").classes("app-shell__inner"):
-        with ui.element("a").props('href="/ui/homepage"').style(
-            "display:flex; align-items:center; gap:0.75rem; text-decoration:none; color:inherit;"
-        ).classes("app-shell__brand no-wrap"):
+        with ui.element("a").props('href="/ui/homepage"').classes("app-shell__brand no-wrap"):
             ui.html(VIBESCRIBE_LOGO_SVG).classes("app-shell__brand-mark")
             ui.label("VibeScribe").classes("app-shell__brand-name")
 
diff --git a/src/transcription/ui/components/data_display.py b/src/transcription/ui/components/data_display.py
index 7258ec7..a05e98b 100644
--- a/src/transcription/ui/components/data_display.py
+++ b/src/transcription/ui/components/data_display.py
@@ -11,4 +11,4 @@ def metadata_row(label: str, value: str):
 
 def archival_badge(text: str):
     """Standardized Aged Sepia badge."""
-    return ui.badge(text, color="secondary", text_color="dark").classes("text-[10px]")
\ No newline at end of file
+    return ui.badge(text).classes("text-[10px] ui-badge-secondary")
diff --git a/src/transcription/ui/components/document_panzoom.py b/src/transcription/ui/components/document_panzoom.py
index cb96c0e..ed0e019 100644
--- a/src/transcription/ui/components/document_panzoom.py
+++ b/src/transcription/ui/components/document_panzoom.py
@@ -24,17 +24,12 @@ def render_document_panzoom(*, source: Source) -> None:
     document_url = _document_url(source)
     document_kind = _document_kind(source)
 
-    with ui.card().classes("w-full q-pa-md vibe-card"):
+    with ui.card().classes("w-full q-pa-md ui-card-surface"):
         with ui.row().classes("w-full items-center justify-between no-wrap"):
             ui.label("Document preview").classes("text-subtitle1 text-weight-medium")
-            ui.label(source.filename).classes("text-caption vibe-text-muted ellipsis").style(
-                "max-width: 60%; text-align: right;"
-            )
+            ui.label(source.filename).classes("text-caption ui-text-muted ellipsis document-panzoom-filename")
 
-        with (
-            ui.element("div").classes("w-full document-panzoom-host rounded-borders q-mt-md")
-            # .style(f"height: {height};")
-        ) as host:
+        with ui.element("div").classes("w-full document-panzoom-host q-mt-md") as host:
             host.props(f"id={host_id}")
             with ui.element("div").classes("document-panzoom-surface"):
                 if document_kind == "pdf":
@@ -59,43 +54,6 @@ def _register_panzoom_assets() -> None:
         f'<script src="{PANGOZOOM_CDN_URL}"></script>',
         shared=True,
     )
-    ui.add_head_html(
-        """
-        <style>
-            .document-panzoom-host {
-                overflow: hidden;
-                touch-action: none;
-            }
-
-            .document-panzoom-surface {
-                width: 100%;
-                height: 100%;
-                display: flex;
-                align-items: flex-start;
-                justify-content: flex-start;
-            }
-
-            .document-panzoom-media {
-                width: auto;
-                height: auto;
-                display: block;
-                max-width: 100%;
-                max-height: 100%;
-                user-select: none;
-                -webkit-user-drag: none;
-            }
-
-            .document-panzoom-iframe {
-                width: 100%;
-                height: 100%;
-                border: 0;
-                pointer-events: none;
-                background: var(--theme-surface-raised);
-            }
-        </style>
-        """,
-        shared=True,
-    )
 
 
 def _document_url(source: Source) -> str:
diff --git a/src/transcription/ui/components/error_presenter.py b/src/transcription/ui/components/error_presenter.py
index 9772b85..4bb1d14 100644
--- a/src/transcription/ui/components/error_presenter.py
+++ b/src/transcription/ui/components/error_presenter.py
@@ -26,7 +26,7 @@ def show_error(exc: Exception, *, title: str, operation: str) -> None:
         close_button="Dismiss",
     )
 
-    with ui.card().classes("vibe-card--error q-mt-md q-pa-md"):
+    with ui.card().classes("ui-card-error q-mt-md q-pa-md"):
         ui.label(title).classes("text-subtitle1")
         ui.label(error.message)
         ui.label(f"Suggested action: {error.suggestion}").classes("text-weight-medium")
diff --git a/src/transcription/ui/components/table/common.py b/src/transcription/ui/components/table/common.py
index bff5a7b..9b66923 100644
--- a/src/transcription/ui/components/table/common.py
+++ b/src/transcription/ui/components/table/common.py
@@ -4,7 +4,8 @@ import logging
 from collections.abc import Callable
 from typing import Any
 
-from nicegui import events, ui
+from nicegui import events
+from nicegui import ui
 
 logger = logging.getLogger(__name__)
 
@@ -61,7 +62,7 @@ def build_table(
                 search_input = (
                     ui.input(placeholder=search_placeholder)
                     .props("dense outlined clearable icon=search")
-                    .classes("w-64 text-xs bg-white")
+                    .classes("w-64 text-xs ui-form-surface")
                 )
 
         table = (
@@ -86,4 +87,4 @@ def build_table(
     if on_row_click_id is not None:
         _bind_row_click_handler(table, on_row_click_id=on_row_click_id)
 
-    return table
\ No newline at end of file
+    return table
diff --git a/src/transcription/ui/components/table/documents.py b/src/transcription/ui/components/table/documents.py
index 84d3587..cab04e0 100644
--- a/src/transcription/ui/components/table/documents.py
+++ b/src/transcription/ui/components/table/documents.py
@@ -85,15 +85,14 @@ def render_documents_table(rows: Sequence[DocumentTableRow]) -> None:
         "body-cell-document_type",
         r"""
         <q-td :props="props">
-            <q-chip 
-                dense 
-                square 
+            <q-chip
+                dense
+                square
                 size="sm"
-                color="primary"
-                text-color="white"
+                class="ui-chip-primary"
             >
                 {{ props.value }}
             </q-chip>
         </q-td>
         """,
-    )
\ No newline at end of file
+    )
diff --git a/src/transcription/ui/components/table/jobs.py b/src/transcription/ui/components/table/jobs.py
index 65becf2..ff6bba2 100644
--- a/src/transcription/ui/components/table/jobs.py
+++ b/src/transcription/ui/components/table/jobs.py
@@ -4,7 +4,8 @@ from __future__ import annotations
 
 from collections.abc import Sequence
 from dataclasses import dataclass
-from datetime import UTC, datetime
+from datetime import UTC
+from datetime import datetime
 from typing import Any
 from uuid import UUID
 
@@ -12,6 +13,7 @@ from nicegui import ui
 
 from transcription.ui.components.cards import archival_card
 from transcription.ui.components.primitives import render_empty_state
+
 from .common import build_table
 
 
@@ -114,20 +116,14 @@ def render_jobs_table(rows: Sequence[JobTableRow]) -> None:
         "body-cell-status",
         r"""
         <q-td :props="props">
-            <q-chip 
-                dense 
-                square 
+            <q-chip
+                dense
+                square
                 size="sm"
-                :color="
-                    props.value === 'completed' || props.value === 'transcribed' ? 'positive' :
-                    props.value === 'failed' ? 'negative' :
-                    props.value === 'processing' ? 'secondary' :
-                    props.value === 'queued' ? 'warning' : 'grey-6'
-                "
-                text-color="white"
+                :class="`ui-status ui-status--${props.value}`"
             >
                 {{ props.value.toUpperCase() }}
             </q-chip>
         </q-td>
         """,
-    )
\ No newline at end of file
+    )
diff --git a/src/transcription/ui/components/table/sources.py b/src/transcription/ui/components/table/sources.py
index 955935b..7488309 100644
--- a/src/transcription/ui/components/table/sources.py
+++ b/src/transcription/ui/components/table/sources.py
@@ -93,7 +93,7 @@ def render_sources_table(rows: Sequence[SourceTableRow]) -> None:
                 "label": "Error Detail",
                 "field": "job_source_error_detail",
                 "sortable": False,
-                "classes": "font-mono text-xs truncate max-w-xs vibe-text-muted",
+                "classes": "font-mono text-xs truncate max-w-xs ui-text-muted",
             },
         ],
         default_sort_by="page_number",
@@ -105,15 +105,14 @@ def render_sources_table(rows: Sequence[SourceTableRow]) -> None:
         "body-cell-job_source_status",
         r"""
         <q-td :props="props">
-            <q-chip 
-                dense 
-                square 
+            <q-chip
+                dense
+                square
                 size="sm"
-                :color="props.value === 'transcribed' ? 'positive' : props.value === 'failed' ? 'negative' : 'grey-5'"
-                text-color="white"
+                :class="`ui-status ui-status--${props.value}`"
             >
                 {{ props.value }}
             </q-chip>
         </q-td>
         """,
-    )
\ No newline at end of file
+    )
diff --git a/src/transcription/ui/components/transcript.py b/src/transcription/ui/components/transcript.py
index 4263be0..2b04e73 100644
--- a/src/transcription/ui/components/transcript.py
+++ b/src/transcription/ui/components/transcript.py
@@ -10,7 +10,6 @@ from typing import Any
 from nicegui import ui
 
 from transcription.db.models import Job
-from transcription.db.models import JobSource
 from transcription.db.models import Source
 
 type RevisionAction = Callable[[Source], Awaitable[None] | None]
@@ -25,21 +24,21 @@ def render_original_transcription_card(*, job: Job, classes: str = "w-full") ->
     model = job.model or "unknown"
     caption = f"{provider} | {model} | {_format_created_at(job.date_updated)}"
 
-    card = ui.card().classes(f"{classes} q-pa-md vibe-card")
+    card = ui.card().classes(f"{classes} q-pa-md ui-card-surface")
     with card, ui.column().classes("w-full q-gutter-y-sm"):
         ui.label(header).classes("text-subtitle1 text-weight-medium")
-        ui.label(caption).classes("text-caption vibe-text-muted")
+        ui.label(caption).classes("text-caption ui-text-muted")
         _metadata_row(label="Prompt", value=_latest_job_prompt(job) or "unknown")
         _metadata_row(label="Updated", value=_format_created_at(job.date_updated))
 
         latest_transcription = _latest_job_transcription(job)
 
         if latest_transcription:
-            with ui.card().classes("w-full q-pa-sm"):
+            with ui.card().classes("w-full q-pa-sm ui-card-surface"):
                 ui.markdown(latest_transcription)
 
         if latest_error_detail:
-            with ui.card().classes("w-full vibe-card--error q-pa-sm"):
+            with ui.card().classes("w-full ui-card-error q-pa-sm"):
                 ui.label("Failure detail").classes("text-caption text-uppercase")
                 ui.label(latest_error_detail).classes("text-body2")
 
@@ -60,16 +59,16 @@ def render_revision_row(
     header = "Source revision | User-authored"
     caption = _format_created_at(revision.date_revised or revision.date_uploaded)
 
-    expansion = ui.expansion(value=initially_expanded, group="group").classes(f"{classes} rounded-borders vibe-card")
+    expansion = ui.expansion(value=initially_expanded, group="group").classes(f"{classes} ui-card-surface")
 
     with expansion, ui.column().classes("w-full q-gutter-y-sm q-pa-sm"):
         with expansion.add_slot("header"), ui.row().classes("w-full items-start justify-between q-gutter-md"):
             with ui.column().classes("q-gutter-none"):
                 ui.label(header).classes("text-subtitle1 text-weight-medium")
-                ui.label(caption).classes("text-caption vibe-text-muted")
+                ui.label(caption).classes("text-caption ui-text-muted")
 
             if on_delete is not None:
-                with ui.dialog() as delete_dialog, ui.card().classes("q-pa-md"):
+                with ui.dialog() as delete_dialog, ui.card().classes("q-pa-md ui-card-surface"):
                     ui.label("Delete this source revision?").classes("text-body1")
                     with ui.row().classes("w-full justify-end q-gutter-sm"):
                         ui.button("Cancel", on_click=lambda: delete_dialog.submit(False)).props("flat")
@@ -94,7 +93,7 @@ def render_revision_row(
         _metadata_row(label="Created", value=_format_created_at(revision.date_revised or revision.date_uploaded))
 
         if revision.revised_text:
-            with ui.card().classes("w-full q-pa-sm"):
+            with ui.card().classes("w-full q-pa-sm ui-card-surface"):
                 ui.markdown(revision.revised_text)
 
     return expansion
@@ -128,5 +127,5 @@ def _format_created_at(value: datetime) -> str:
 
 def _metadata_row(*, label: str, value: str) -> None:
     with ui.row().classes("w-md items-start justify-between q-gutter-x-md"):
-        ui.label(label).classes("text-caption vibe-text-muted text-uppercase")
+        ui.label(label).classes("text-caption ui-text-muted text-uppercase")
         ui.label(value).classes("text-body2 text-right break-all")
diff --git a/src/transcription/ui/components/viewers.py b/src/transcription/ui/components/viewers.py
index e375581..c4b4bc3 100644
--- a/src/transcription/ui/components/viewers.py
+++ b/src/transcription/ui/components/viewers.py
@@ -6,17 +6,16 @@ from nicegui import ui
 def dark_room_viewer(
     image_path: str | None,
     count_label: str = "1 Source Linked",
-    *,
-    container_height: str = "500px",
 ) -> None:
     """Render a plain responsive image that fills available width."""
     del count_label
 
     if image_path:
-        ui.image(image_path).classes("w-full rounded-sm block").style("height: auto;")
+        ui.image(image_path).classes("w-full rounded-sm block ui-media-image")
         return
 
     with ui.column().classes(
-        "w-full items-center justify-center border ui-border-viewer ui-bg-viewer-overlay-soft rounded-sm p-8"
-    ).style(f"min-height: {container_height};"):
-        ui.label("No source media available for inspection.").classes("ui-text-muted text-xs italic")
\ No newline at end of file
+        "w-full items-center justify-center border ui-border-viewer "
+        "ui-bg-viewer-overlay-soft rounded-sm p-8 ui-media-placeholder"
+    ):
+        ui.label("No source media available for inspection.").classes("ui-text-muted text-xs italic")
diff --git a/src/transcription/ui/static/theme.css b/src/transcription/ui/static/theme.css
index ae80223..a92a7c0 100644
--- a/src/transcription/ui/static/theme.css
+++ b/src/transcription/ui/static/theme.css
@@ -45,57 +45,6 @@ body {
   font-family: "Aptos", "Trebuchet MS", sans-serif;
 }
 
-.q-card,
-.vibe-card {
-  border: 1px solid var(--theme-border);
-  color: var(--theme-text);
-  background: var(--theme-surface-raised);
-  box-shadow: none;
-}
-
-.vibe-card--error {
-  border-color: var(--palette-carbon-black);
-  color: var(--theme-inverse-text);
-  background: var(--palette-carbon-black);
-}
-
-.vibe-text-muted {
-  color: var(--theme-text-muted);
-}
-
-.vibe-separator {
-  background: var(--theme-border);
-}
-
-.vibe-status {
-  border: 1px solid currentColor;
-}
-
-.vibe-status--queued {
-  color: var(--palette-blue-slate);
-  background: var(--palette-platinum);
-}
-
-.vibe-status--processing {
-  color: var(--palette-carbon-black);
-  background: var(--palette-powder-blue);
-}
-
-.vibe-status--transcribed {
-  color: var(--palette-carbon-black);
-  background: var(--palette-cool-steel);
-}
-
-.vibe-status--failed {
-  color: var(--palette-platinum);
-  background: var(--palette-carbon-black);
-}
-
-.vibe-status--default {
-  color: var(--palette-blue-slate);
-  background: var(--theme-surface-muted);
-}
-
 button:focus-visible,
 a:focus-visible,
 textarea:focus-visible,
@@ -105,7 +54,7 @@ input:focus-visible,
   outline-offset: 2px;
 }
 
-/* Semantic utility classes for incremental migration away from inline hex styles. */
+/* Semantic utility classes */
 .ui-text-primary {
   color: var(--theme-text);
 }
@@ -163,6 +112,15 @@ input:focus-visible,
   color: var(--theme-text);
   background: var(--theme-surface-raised);
   border-radius: 0.125rem;
+  box-shadow: none;
+}
+
+.ui-card-error {
+  border: 1px solid var(--theme-danger);
+  color: var(--theme-inverse-text);
+  background: var(--theme-danger);
+  border-radius: 0.125rem;
+  box-shadow: none;
 }
 
 .ui-row-surface {
@@ -214,6 +172,45 @@ input:focus-visible,
   color: var(--theme-danger);
 }
 
+.ui-chip-primary {
+  color: var(--theme-inverse-text);
+  background: var(--theme-primary);
+}
+
+.ui-badge-secondary {
+  color: var(--theme-text);
+  background: var(--theme-secondary);
+}
+
+.ui-status {
+  color: var(--theme-text-muted);
+  background: var(--theme-surface-muted);
+  border: 1px solid currentColor;
+}
+
+.ui-status--queued,
+.ui-status--pending {
+  color: var(--theme-primary);
+  background: var(--theme-surface-raised);
+}
+
+.ui-status--processing {
+  color: var(--theme-text);
+  background: var(--theme-surface-muted);
+}
+
+.ui-status--completed,
+.ui-status--partial_success,
+.ui-status--transcribed {
+  color: var(--theme-text);
+  background: var(--theme-secondary);
+}
+
+.ui-status--failed {
+  color: var(--theme-inverse-text);
+  background: var(--theme-danger);
+}
+
 .ui-form-surface .q-field__control {
   background: var(--theme-surface-raised);
 }
@@ -262,18 +259,18 @@ input:focus-visible,
 
 .ui-table .q-table th,
 .ui-table-header {
-  color: var(--theme-inverse-text) !important;
-  background-color: var(--theme-primary) !important;
+  color: var(--theme-inverse-text);
+  background-color: var(--theme-primary);
   font-weight: 700;
 }
 
 .ui-table .q-table td {
-  border-bottom: 1px solid var(--theme-border) !important;
+  border-bottom: 1px solid var(--theme-border);
   color: var(--theme-text);
 }
 
 .ui-table .q-table tbody tr:hover {
-  background-color: var(--theme-surface) !important;
+  background-color: var(--theme-surface);
   cursor: pointer;
 }
 
@@ -304,10 +301,13 @@ input:focus-visible,
 }
 
 .app-shell__brand {
+  display: flex;
+  align-items: center;
   gap: 0.75rem;
   color: var(--theme-text);
   font-family: Georgia, serif;
   font-weight: 700;
+  text-decoration: none;
 }
 
 .app-shell__brand-mark {
@@ -348,6 +348,55 @@ input:focus-visible,
   font-weight: 700;
 }
 
+/* Media and source viewers */
+.ui-media-image {
+  height: auto;
+}
+
+.ui-media-placeholder {
+  min-height: 31.25rem;
+}
+
+.document-panzoom-filename {
+  max-width: 60%;
+  text-align: right;
+}
+
+.document-panzoom-host {
+  height: min(70vh, 52rem);
+  overflow: hidden;
+  touch-action: none;
+  border: 1px solid var(--theme-viewer-border);
+  border-radius: 0.125rem;
+  background: var(--theme-viewer);
+}
+
+.document-panzoom-surface {
+  width: 100%;
+  height: 100%;
+  display: flex;
+  align-items: flex-start;
+  justify-content: flex-start;
+}
+
+.document-panzoom-media {
+  width: auto;
+  height: auto;
+  display: block;
+  max-width: 100%;
+  max-height: 100%;
+  user-select: none;
+  -webkit-user-drag: none;
+}
+
+.document-panzoom-iframe {
+  width: 100%;
+  height: 100%;
+  border: 0;
+  pointer-events: none;
+  background: var(--theme-surface-raised);
+}
+
 @media (max-width: 700px) {
   .app-shell {
     padding-inline: 0.75rem;
diff --git a/tests/test_ui_theme.py b/tests/test_ui_theme.py
index e5bd702..fd369cf 100644
--- a/tests/test_ui_theme.py
+++ b/tests/test_ui_theme.py
@@ -1,6 +1,7 @@
 """Tests for global UI theme registration."""
 
 import re
+from pathlib import Path
 
 import pytest
 from fastapi import FastAPI
@@ -8,6 +9,8 @@ from fastapi import FastAPI
 from transcription.ui import register_pages
 from transcription.ui.resources import read_css
 
+UI_ROOT = Path(__file__).parents[1] / "src" / "transcription" / "ui"
+
 
 @pytest.mark.unit
 def test_page_registration_uses_vibescribe_theme(monkeypatch):
@@ -35,3 +38,45 @@ def test_page_registration_uses_vibescribe_theme(monkeypatch):
     }
     assert "--q-primary" in theme_css
     assert run_options["dark"] is False
+
+
+@pytest.mark.unit
+def test_theme_is_the_only_ui_stylesheet():
+    stylesheets = sorted(path.relative_to(UI_ROOT).as_posix() for path in UI_ROOT.rglob("*.css"))
+
+    assert stylesheets == ["static/theme.css"]
+
+
+@pytest.mark.unit
+def test_ui_python_uses_class_driven_theme():
+    prohibited_patterns = {
+        ".style(": "inline NiceGUI style",
+        "<style": "embedded style block",
+        "vibe-": "legacy presentation class",
+    }
+    violations: list[str] = []
+
+    for path in sorted((*UI_ROOT.glob("components/**/*.py"), *UI_ROOT.glob("pages/**/*.py"))):
+        source = path.read_text(encoding="utf-8")
+        for pattern, description in prohibited_patterns.items():
+            if pattern in source:
+                violations.append(f"{path.relative_to(UI_ROOT)}: {description}")
+
+    assert violations == []
+
+
+@pytest.mark.unit
+def test_theme_defines_shared_semantic_surfaces():
+    theme_css = read_css("theme.css")
+
+    for class_name in (
+        "ui-card-surface",
+        "ui-card-error",
+        "ui-form-surface",
+        "ui-table",
+        "ui-chip-primary",
+        "ui-badge-secondary",
+        "ui-status",
+        "document-panzoom-host",
+    ):
+        assert f".{class_name}" in theme_css