diff --git a/services/web/frontend/js/features/project-list/components/project-list-lumiere.tsx b/services/web/frontend/js/features/project-list/components/project-list-lumiere.tsx
index ccb44c0fba..c11f654302 100644
--- a/services/web/frontend/js/features/project-list/components/project-list-lumiere.tsx
+++ b/services/web/frontend/js/features/project-list/components/project-list-lumiere.tsx
@@ -1,6 +1,15 @@
-import React, { memo, useCallback, useEffect, useRef, useState } from 'react'
+import React, {
+  memo,
+  useCallback,
+  useEffect,
+  useRef,
+  useState,
+} from 'react'
 import { useTranslation } from 'react-i18next'
-import { useProjectListContext } from '../context/project-list-context'
+import {
+  Filter,
+  useProjectListContext,
+} from '../context/project-list-context'
 import { Project } from '../../../../../types/project/dashboard/api'
 import { getOwnerName } from '../util/project'
 import { fromNowDate } from '../../../utils/dates'
@@ -35,6 +44,21 @@ import ActionsCell from './table/cells/actions-cell'
 import InlineTags from './table/cells/inline-tags'
 import WelcomePageContent from './welcome-page-content'
 
+// ── Mobile breakpoint ─────────────────────────────────────────────────────────
+
+function useIsMobile() {
+  const [mobile, setMobile] = useState(
+    () => window.matchMedia('(max-width: 767px)').matches
+  )
+  useEffect(() => {
+    const mq = window.matchMedia('(max-width: 767px)')
+    const handler = (e: MediaQueryListEvent) => setMobile(e.matches)
+    mq.addEventListener('change', handler)
+    return () => mq.removeEventListener('change', handler)
+  }, [])
+  return mobile
+}
+
 // ── Tile zoom ─────────────────────────────────────────────────────────────────
 
 type ZoomLevel = 0 | 1 | 1.35 | 1.75
@@ -209,14 +233,16 @@ const ProjectCardCompact = memo(function ProjectCardCompact({
         </a>
         <InlineTags projectId={project.id} />
       </div>
-      <div className="lumiere-compact-format">
-        <FormatCell project={project} />
-      </div>
-      <div className="lumiere-compact-owner" translate="no">
-        <OwnerCell project={project} />
-      </div>
-      <div className="lumiere-compact-date">
-        <LastUpdatedCell project={project} />
+      <div className="lumiere-compact-meta">
+        <div className="lumiere-compact-format">
+          <FormatCell project={project} />
+        </div>
+        <div className="lumiere-compact-owner" translate="no">
+          <OwnerCell project={project} />
+        </div>
+        <div className="lumiere-compact-date">
+          <LastUpdatedCell project={project} />
+        </div>
       </div>
       <div className="lumiere-compact-actions">
         <ActionsCell project={project} />
@@ -230,6 +256,7 @@ export function ProjectListLumiere() {
   const footerProps = getMeta('ol-footer')
   const { t } = useTranslation()
   const [cardScale, setCardScale] = useLumiereCardScale()
+  const isMobile = useIsMobile()
   const {
     error,
     visibleProjects,
@@ -241,13 +268,25 @@ export function ProjectListLumiere() {
     selectedTagId,
     selectedProjects,
     selectOrUnselectAllProjects,
+    selectFilter,
   } = useProjectListContext()
 
+  // On mobile, always use the compact (XS) row view — cards overflow on small screens
+  const effectiveScale = isMobile ? 0 : cardScale
+
   const selectedTag = tags.find(tag => tag._id === selectedTagId)
   const allSelected =
     visibleProjects.length > 0 &&
     selectedProjects.length === visibleProjects.length
 
+  const MOBILE_FILTERS: { f: Filter; label: string }[] = [
+    { f: 'all', label: t('all_projects') },
+    { f: 'owned', label: t('your_projects') },
+    { f: 'shared', label: t('shared_with_you') },
+    { f: 'archived', label: t('archived_projects') },
+    { f: 'trashed', label: t('trashed_projects') },
+  ]
+
   const checkAllRef = useRef<HTMLInputElement>(null)
   useEffect(() => {
     if (checkAllRef.current) {
@@ -295,7 +334,7 @@ export function ProjectListLumiere() {
                     id="lumiere-title"
                   />
                   <div
-                    className="lumiere-zoom-control"
+                    className="lumiere-zoom-control d-none d-md-flex"
                     role="group"
                     aria-label={t('card_size')}
                   >
@@ -312,6 +351,20 @@ export function ProjectListLumiere() {
                     ))}
                   </div>
                 </div>
+                {/* Mobile-only filter pills replacing the hidden sidebar */}
+                <div className="d-flex d-md-none lumiere-mobile-filters" role="group" aria-label={t('filter_projects')}>
+                  {MOBILE_FILTERS.map(({ f, label }) => (
+                    <button
+                      key={f}
+                      type="button"
+                      className={`lumiere-mobile-filter-pill${filter === f ? ' active' : ''}`}
+                      onClick={() => selectFilter(f)}
+                      aria-pressed={filter === f}
+                    >
+                      {label}
+                    </button>
+                  ))}
+                </div>
                 <div className="lumiere-header-actions">
                   <SearchForm
                     inputValue={searchText}
@@ -357,12 +410,12 @@ export function ProjectListLumiere() {
                 <p className="lumiere-empty">{t('no_projects')}</p>
               ) : (
                 <div
-                  className={`lumiere-card-grid${cardScale === 0 ? ' lumiere-card-grid--compact' : ''}`}
+                  className={`lumiere-card-grid${effectiveScale === 0 ? ' lumiere-card-grid--compact' : ''}`}
                   // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
-                  style={cardScale === 0 ? {} : ({ '--lum-card-scale': cardScale } as React.CSSProperties)}
+                  style={effectiveScale === 0 ? {} : ({ '--lum-card-scale': effectiveScale } as React.CSSProperties)}
                 >
                   {visibleProjects.map(project =>
-                    cardScale === 0 ? (
+                    effectiveScale === 0 ? (
                       <ProjectCardCompact key={project.id} project={project} />
                     ) : (
                       <ProjectCard key={project.id} project={project} />
diff --git a/services/web/frontend/stylesheets/pages/project-list-lumiere.scss b/services/web/frontend/stylesheets/pages/project-list-lumiere.scss
index e3695f109a..356c03c0fe 100644
--- a/services/web/frontend/stylesheets/pages/project-list-lumiere.scss
+++ b/services/web/frontend/stylesheets/pages/project-list-lumiere.scss
@@ -341,9 +341,13 @@ $lum-noise: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' wi
     flex-wrap: wrap;
   }
 
-  // Search bar — wide enough to show the full placeholder
+  // Search bar — wide enough to show the full placeholder (relaxed on mobile)
   form.project-search .form-control {
     min-width: 360px;
+
+    @media (max-width: 767px) {
+      min-width: 0;
+    }
   }
 
   .lumiere-title {
@@ -836,6 +840,12 @@ $lum-noise: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' wi
     text-overflow: ellipsis;
   }
 
+  // On desktop, the meta wrapper is invisible to grid layout — its children
+  // participate as direct grid items, preserving the 6-column alignment.
+  .lumiere-compact-meta {
+    display: contents;
+  }
+
   .lumiere-compact-actions {
     display: flex;
     align-items: center;
@@ -860,6 +870,96 @@ $lum-noise: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' wi
     opacity: 1;
   }
 
+  // ── Mobile compact row — 2-line layout ────────────────────────────────────
+  // On small screens the 6-column grid overflows. Switch to:
+  //   Row 1: [checkbox] [name+tags]  [actions]
+  //   Row 2: [checkbox] [format · owner · date]
+
+  @media (max-width: 767px) {
+    .lumiere-compact-row {
+      grid-template-columns: 28px 1fr auto;
+      grid-template-rows: auto auto;
+      row-gap: 0.2rem;
+
+      .lumiere-compact-checkbox {
+        grid-column: 1;
+        grid-row: 1 / 3;
+        align-self: center;
+      }
+
+      .lumiere-compact-name-cell {
+        grid-column: 2;
+        grid-row: 1;
+      }
+
+      .lumiere-compact-actions {
+        grid-column: 3;
+        grid-row: 1;
+        align-self: center;
+      }
+
+      // Meta wrapper becomes a flex row spanning the second line
+      .lumiere-compact-meta {
+        display: flex;
+        align-items: center;
+        gap: 0.4rem;
+        flex-wrap: wrap;
+        grid-column: 2 / 4;
+        grid-row: 2;
+      }
+
+      // Actions always visible — no hover on touch devices
+      @media (hover: none) {
+        .lumiere-compact-actions .action-btn {
+          opacity: 1;
+        }
+      }
+    }
+  }
+
+  // ── Mobile filter pills (replaces hidden sidebar on xs/sm) ────────────────
+
+  .lumiere-mobile-filters {
+    overflow-x: auto;
+    gap: 0.45rem;
+    padding: 0.25rem 0 0.5rem;
+    scrollbar-width: none;
+    -ms-overflow-style: none;
+    flex-shrink: 0;
+    width: 100%;
+
+    &::-webkit-scrollbar { display: none; }
+  }
+
+  .lumiere-mobile-filter-pill {
+    flex-shrink: 0;
+    padding: 0.3rem 0.8rem;
+    border-radius: 20px;
+    font-size: 0.8rem;
+    font-weight: 500;
+    border: 1.5px solid $lum-border;
+    background: rgba(255, 255, 255, 0.7);
+    color: $lum-text-sub;
+    cursor: pointer;
+    white-space: nowrap;
+    transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
+    line-height: 1.4;
+
+    &.active {
+      background: $lum-teal;
+      border-color: $lum-teal;
+      color: #fff;
+      font-weight: 600;
+    }
+
+    &:hover:not(.active),
+    &:focus:not(.active) {
+      border-color: rgba($lum-teal, 0.55);
+      color: $lum-teal;
+      background: rgba($lum-teal, 0.07);
+    }
+  }
+
   // ── Selection bar — tool buttons ──────────────────────────────────────────
 
   .lumiere-selection-bar {