diff --git a/src/static/css/style.css b/src/static/css/style.css
index 644c818..e8918c1 100644
--- a/src/static/css/style.css
+++ b/src/static/css/style.css
@@ -2539,6 +2539,11 @@ a:hover {
     transition: transform 0.2s, background 0.2s;
 }
 
+.toggle-label input:focus-visible + .toggle-switch {
+    outline: 2px solid var(--accent);
+    outline-offset: 2px;
+}
+
 .toggle-label input:checked + .toggle-switch {
     background: var(--accent);
 }
@@ -3786,6 +3791,21 @@ a:hover {
     top: 0;
 }
 
+/* === Default Focus-Visible fuer alle interaktiven Elemente (WCAG 2.4.7) === */
+a:focus-visible, button:focus-visible, input:focus-visible,
+select:focus-visible, textarea:focus-visible,
+[tabindex]:focus-visible, [role="button"]:focus-visible {
+    outline: 2px solid var(--accent);
+    outline-offset: 2px;
+}
+
+/* Form-Fehler (Accessibility) */
+.form-error {
+    font-size: 12px;
+    color: var(--error);
+    margin-top: var(--sp-xs);
+}
+
 /* prefers-reduced-motion: alle Animationen deaktivieren */
 @media (prefers-reduced-motion: reduce) {
     *, *::before, *::after {
@@ -3847,10 +3867,22 @@ a:hover {
     color: var(--text-primary);
     user-select: none;
 }
-.a11y-option input[type="checkbox"] { display: none; }
+.a11y-option input[type="checkbox"] {
+    position: absolute;
+    width: 1px;
+    height: 1px;
+    overflow: hidden;
+    clip: rect(0, 0, 0, 0);
+    white-space: nowrap;
+    border: 0;
+}
 .a11y-option .toggle-switch {
     flex-shrink: 0;
 }
+.a11y-option input:focus-visible + .toggle-switch {
+    outline: 2px solid var(--accent);
+    outline-offset: 2px;
+}
 .a11y-option input:checked + .toggle-switch {
     background: var(--accent);
 }
@@ -4021,16 +4053,17 @@ a:hover {
     --input-border: #94A3B8;
 }
 
-/* === A11y: Focus-Hervorhebung === */
-[data-a11y-focus="true"] a:focus,
-[data-a11y-focus="true"] button:focus,
-[data-a11y-focus="true"] input:focus,
-[data-a11y-focus="true"] select:focus,
-[data-a11y-focus="true"] textarea:focus,
-[data-a11y-focus="true"] [tabindex]:focus,
-[data-a11y-focus="true"] [role="button"]:focus {
+/* === A11y: Verstaerkte Focus-Anzeige === */
+[data-a11y-focus="true"] a:focus-visible,
+[data-a11y-focus="true"] button:focus-visible,
+[data-a11y-focus="true"] input:focus-visible,
+[data-a11y-focus="true"] select:focus-visible,
+[data-a11y-focus="true"] textarea:focus-visible,
+[data-a11y-focus="true"] [tabindex]:focus-visible,
+[data-a11y-focus="true"] [role="button"]:focus-visible {
     outline: 3px solid var(--accent) !important;
     outline-offset: 2px !important;
+    box-shadow: 0 0 0 4px rgba(200, 168, 81, 0.3) !important;
 }
 
 /* === A11y: Größere Schrift === */
diff --git a/src/static/dashboard.html b/src/static/dashboard.html
index cfe82d7..41b3100 100644
--- a/src/static/dashboard.html
+++ b/src/static/dashboard.html
@@ -53,8 +53,8 @@
             </div>
 
             <div class="sidebar-section">
-                <h2 class="sidebar-section-title collapsible" onclick="App.toggleSidebarSection('active-incidents')" role="button" tabindex="0">
-                    <span class="sidebar-chevron" id="chevron-active-incidents">&#9662;</span>
+                <h2 class="sidebar-section-title collapsible" onclick="App.toggleSidebarSection('active-incidents')" role="button" tabindex="0" aria-expanded="true">
+                    <span class="sidebar-chevron" id="chevron-active-incidents" aria-hidden="true">&#9662;</span>
                     Aktive Lagen
                     <span class="sidebar-section-count" id="count-active-incidents"></span>
                 </h2>
@@ -62,8 +62,8 @@
             </div>
 
             <div class="sidebar-section">
-                <h2 class="sidebar-section-title collapsible" onclick="App.toggleSidebarSection('active-research')" role="button" tabindex="0">
-                    <span class="sidebar-chevron" id="chevron-active-research">&#9662;</span>
+                <h2 class="sidebar-section-title collapsible" onclick="App.toggleSidebarSection('active-research')" role="button" tabindex="0" aria-expanded="true">
+                    <span class="sidebar-chevron" id="chevron-active-research" aria-hidden="true">&#9662;</span>
                     Aktive Recherchen
                     <span class="sidebar-section-count" id="count-active-research"></span>
                 </h2>
@@ -71,8 +71,8 @@
             </div>
 
             <div class="sidebar-section">
-                <h2 class="sidebar-section-title collapsible" onclick="App.toggleSidebarSection('archived-incidents')" role="button" tabindex="0">
-                    <span class="sidebar-chevron" id="chevron-archived-incidents">&#9662;</span>
+                <h2 class="sidebar-section-title collapsible" onclick="App.toggleSidebarSection('archived-incidents')" role="button" tabindex="0" aria-expanded="false">
+                    <span class="sidebar-chevron" id="chevron-archived-incidents" aria-hidden="true">&#9662;</span>
                     Archiv
                     <span class="sidebar-section-count" id="count-archived-incidents"></span>
                 </h2>
@@ -111,15 +111,15 @@
                             <button class="btn btn-primary btn-small" id="refresh-btn">Aktualisieren</button>
                             <button class="btn btn-secondary btn-small" id="edit-incident-btn">Bearbeiten</button>
                             <div class="export-dropdown" id="export-dropdown">
-                                <button class="btn btn-secondary btn-small" onclick="App.toggleExportDropdown(event)">Exportieren &#9662;</button>
-                                <div class="export-dropdown-menu" id="export-dropdown-menu">
-                                    <button class="export-dropdown-item" onclick="App.exportIncident('md','report')">Lagebericht (Markdown)</button>
-                                    <button class="export-dropdown-item" onclick="App.exportIncident('json','report')">Lagebericht (JSON)</button>
-                                    <hr class="export-dropdown-divider">
-                                    <button class="export-dropdown-item" onclick="App.exportIncident('md','full')">Vollexport (Markdown)</button>
-                                    <button class="export-dropdown-item" onclick="App.exportIncident('json','full')">Vollexport (JSON)</button>
-                                    <hr class="export-dropdown-divider">
-                                    <button class="export-dropdown-item" onclick="App.printIncident()">Drucken / PDF</button>
+                                <button class="btn btn-secondary btn-small" onclick="App.toggleExportDropdown(event)" aria-expanded="false" aria-haspopup="true">Exportieren &#9662;</button>
+                                <div class="export-dropdown-menu" id="export-dropdown-menu" role="menu">
+                                    <button class="export-dropdown-item" role="menuitem" onclick="App.exportIncident('md','report')">Lagebericht (Markdown)</button>
+                                    <button class="export-dropdown-item" role="menuitem" onclick="App.exportIncident('json','report')">Lagebericht (JSON)</button>
+                                    <hr class="export-dropdown-divider" role="separator">
+                                    <button class="export-dropdown-item" role="menuitem" onclick="App.exportIncident('md','full')">Vollexport (Markdown)</button>
+                                    <button class="export-dropdown-item" role="menuitem" onclick="App.exportIncident('json','full')">Vollexport (JSON)</button>
+                                    <hr class="export-dropdown-divider" role="separator">
+                                    <button class="export-dropdown-item" role="menuitem" onclick="App.printIncident()">Drucken / PDF</button>
                                 </div>
                             </div>
                             <button class="btn btn-secondary btn-small" id="archive-incident-btn">Archivieren</button>
@@ -193,7 +193,7 @@
                         <div class="grid-stack-item-content">
                             <div class="card incident-analysis-summary">
                                 <div class="card-header">
-                                    <div class="card-title clickable" onclick="openContentModal('Lagebild', 'summary-content')">Lagebild</div>
+                                    <div class="card-title clickable" role="button" tabindex="0" onclick="openContentModal('Lagebild', 'summary-content')">Lagebild</div>
                                     <span class="lagebild-timestamp" id="lagebild-timestamp"></span>
                                 </div>
                                 <div id="summary-content">
@@ -207,7 +207,7 @@
                         <div class="grid-stack-item-content">
                             <div class="card incident-analysis-factcheck" id="factcheck-card">
                                 <div class="card-header">
-                                    <div class="card-title clickable" onclick="openContentModal('Faktencheck', 'factcheck-list')">Faktencheck</div>
+                                    <div class="card-title clickable" role="button" tabindex="0" onclick="openContentModal('Faktencheck', 'factcheck-list')">Faktencheck</div>
                                     <div class="fc-filter-bar" id="fc-filters"></div>
                                 </div>
                                 <div class="factcheck-list" id="factcheck-list">
@@ -236,7 +236,7 @@
                         <div class="grid-stack-item-content">
                             <div class="card timeline-card">
                                 <div class="card-header">
-                                    <div class="card-title clickable" onclick="openContentModal('Ereignis-Timeline', 'timeline')">Ereignis-Timeline</div>
+                                    <div class="card-title clickable" role="button" tabindex="0" onclick="openContentModal('Ereignis-Timeline', 'timeline')">Ereignis-Timeline</div>
                                     <div class="ht-controls">
                                         <div class="ht-filter-group">
                                             <button class="ht-filter-btn active" data-filter="all" onclick="App.setTimelineFilter('all')" aria-pressed="true">Alle</button>
@@ -293,7 +293,7 @@
                 <div class="modal-body">
                     <div class="form-group">
                         <label for="inc-title">Titel des Vorfalls</label>
-                        <input type="text" id="inc-title" required placeholder="z.B. Explosion in Madrid">
+                        <input type="text" id="inc-title" required aria-required="true" placeholder="z.B. Explosion in Madrid">
                     </div>
                     <div class="form-group">
                         <label for="inc-description">Beschreibung / Kontext</label>
@@ -544,7 +544,7 @@
                     </div>
                     <div class="form-group">
                         <label for="fb-message">Nachricht</label>
-                        <textarea id="fb-message" required minlength="10" maxlength="5000" rows="6" placeholder="Beschreibe dein Anliegen (mind. 10 Zeichen)..."></textarea>
+                        <textarea id="fb-message" required aria-required="true" minlength="10" maxlength="5000" rows="6" placeholder="Beschreibe dein Anliegen (mind. 10 Zeichen)..."></textarea>
                         <div class="form-hint"><span id="fb-char-count">0</span> / 5.000 Zeichen</div>
                     </div>
                 </div>
diff --git a/src/static/index.html b/src/static/index.html
index 311032d..95564e2 100644
--- a/src/static/index.html
+++ b/src/static/index.html
@@ -30,7 +30,7 @@
             <form id="email-form">
                 <div class="form-group">
                     <label for="email">E-Mail-Adresse</label>
-                    <input type="email" id="email" name="email" autocomplete="email" required placeholder="name@organisation.de">
+                    <input type="email" id="email" name="email" autocomplete="email" required aria-required="true" placeholder="name@organisation.de">
                 </div>
                 <button type="submit" class="btn btn-primary btn-full" id="email-btn">Anmelden</button>
             </form>
@@ -42,7 +42,7 @@
                 </p>
                 <div class="form-group">
                     <label for="code">Code eingeben</label>
-                    <input type="text" id="code" name="code" autocomplete="one-time-code" required
+                    <input type="text" id="code" name="code" autocomplete="one-time-code" required aria-required="true"
                            placeholder="000000" maxlength="6" pattern="[0-9]{6}"
                            style="text-align:center; font-size:24px; letter-spacing:8px; font-family:monospace;">
                 </div>
diff --git a/src/static/js/app.js b/src/static/js/app.js
index bd7eafa..53754dc 100644
--- a/src/static/js/app.js
+++ b/src/static/js/app.js
@@ -59,7 +59,7 @@ const A11yManager = {
                     <path d="M12 8c-3.3 0-6 .5-6 .5v2s2.7-.5 5-.5v3l-3 7h2.5l2.5-5.5 2.5 5.5h2.5l-3-7v-3c2.3 0 5 .5 5 .5v-2S15.3 8 12 8z"/>
                 </svg>
             </button>
-            <div class="a11y-panel" id="a11y-panel" style="display:none;">
+            <div class="a11y-panel" id="a11y-panel" role="group" aria-label="Barrierefreiheits-Einstellungen" style="display:none;">
                 <div class="a11y-panel-title">Barrierefreiheit</div>
                 <label class="a11y-option">
                     <input type="checkbox" id="a11y-contrast">
@@ -69,7 +69,7 @@ const A11yManager = {
                 <label class="a11y-option">
                     <input type="checkbox" id="a11y-focus">
                     <span class="toggle-switch"></span>
-                    <span>Focus-Hervorhebung</span>
+                    <span>Verstärkte Focus-Anzeige</span>
                 </label>
                 <label class="a11y-option">
                     <input type="checkbox" id="a11y-fontsize">
@@ -108,6 +108,28 @@ const A11yManager = {
             }
         });
 
+        // Keyboard: Esc schließt, Pfeiltasten navigieren
+        container.addEventListener('keydown', (e) => {
+            if (e.key === 'Escape' && this._isOpen) {
+                e.stopPropagation();
+                this._closePanel();
+                return;
+            }
+            if (!this._isOpen) return;
+            if (e.key === 'ArrowDown' || e.key === 'ArrowUp') {
+                e.preventDefault();
+                const options = Array.from(document.querySelectorAll('.a11y-option input[type="checkbox"]'));
+                const idx = options.indexOf(document.activeElement);
+                let next;
+                if (e.key === 'ArrowDown') {
+                    next = idx < options.length - 1 ? idx + 1 : 0;
+                } else {
+                    next = idx > 0 ? idx - 1 : options.length - 1;
+                }
+                options[next].focus();
+            }
+        });
+
         // Einstellungen anwenden + Checkboxen synchronisieren
         this._apply();
         this._syncUI();
@@ -146,12 +168,19 @@ const A11yManager = {
         this._isOpen = true;
         document.getElementById('a11y-panel').style.display = '';
         document.getElementById('a11y-btn').setAttribute('aria-expanded', 'true');
+        // Fokus auf erste Option setzen
+        requestAnimationFrame(() => {
+            const first = document.querySelector('.a11y-option input[type="checkbox"]');
+            if (first) first.focus();
+        });
     },
 
     _closePanel() {
         this._isOpen = false;
         document.getElementById('a11y-panel').style.display = 'none';
-        document.getElementById('a11y-btn').setAttribute('aria-expanded', 'false');
+        const btn = document.getElementById('a11y-btn');
+        btn.setAttribute('aria-expanded', 'false');
+        btn.focus();
     }
 };
 
@@ -291,7 +320,7 @@ const NotificationCenter = {
             const timeStr = time.toLocaleTimeString('de-DE', { hour: '2-digit', minute: '2-digit' });
             const unreadClass = n.read ? '' : ' unread';
             const icon = n.icon || 'info';
-            return `<div class="notification-item${unreadClass}" onclick="NotificationCenter._handleClick(${n.incident_id})" data-id="${n.incident_id}">
+            return `<div class="notification-item${unreadClass}" onclick="NotificationCenter._handleClick(${n.incident_id})" data-id="${n.incident_id}" role="button" tabindex="0">
                 <div class="notification-item-icon ${icon}">${this._iconSymbol(icon)}</div>
                 <div class="notification-item-body">
                     <div class="notification-item-title">${this._escapeHtml(n.title)}</div>
@@ -566,10 +595,27 @@ const App = {
         this.renderSidebar();
     },
 
+    _announceForSR(text) {
+        let el = document.getElementById('sr-announcement');
+        if (!el) {
+            el = document.createElement('div');
+            el.id = 'sr-announcement';
+            el.setAttribute('role', 'status');
+            el.setAttribute('aria-live', 'polite');
+            el.className = 'sr-only';
+            document.body.appendChild(el);
+        }
+        el.textContent = '';
+        requestAnimationFrame(() => { el.textContent = text; });
+    },
+
     async selectIncident(id) {
         this.closeRefreshHistory();
         this.currentIncidentId = id;
         localStorage.setItem('selectedIncidentId', id);
+        // SR-Announcement
+        const inc = this.incidents.find(i => i.id === id);
+        if (inc) this._announceForSR('Lage ausgewählt: ' + inc.title);
         this.renderSidebar();
 
         document.getElementById('empty-state').style.display = 'none';
@@ -1352,9 +1398,40 @@ const App = {
         };
     },
 
+    _clearFormErrors(formEl) {
+        formEl.querySelectorAll('.form-error').forEach(el => el.remove());
+        formEl.querySelectorAll('[aria-invalid]').forEach(el => {
+            el.removeAttribute('aria-invalid');
+            el.removeAttribute('aria-describedby');
+        });
+    },
+
+    _showFieldError(field, message) {
+        field.setAttribute('aria-invalid', 'true');
+        const errorId = field.id + '-error';
+        field.setAttribute('aria-describedby', errorId);
+        const errorEl = document.createElement('div');
+        errorEl.className = 'form-error';
+        errorEl.id = errorId;
+        errorEl.setAttribute('role', 'alert');
+        errorEl.textContent = message;
+        field.parentNode.appendChild(errorEl);
+    },
+
     async handleFormSubmit(e) {
         e.preventDefault();
         const submitBtn = document.getElementById('modal-new-submit');
+        const form = document.getElementById('new-incident-form');
+        this._clearFormErrors(form);
+
+        // Validierung
+        const titleField = document.getElementById('inc-title');
+        if (!titleField.value.trim()) {
+            this._showFieldError(titleField, 'Bitte einen Titel eingeben.');
+            titleField.focus();
+            return;
+        }
+
         submitBtn.disabled = true;
 
         try {
@@ -1926,12 +2003,18 @@ const App = {
         event.stopPropagation();
         const menu = document.getElementById('export-dropdown-menu');
         if (!menu) return;
-        menu.classList.toggle('show');
+        const isOpen = menu.classList.toggle('show');
+        const btn = menu.previousElementSibling;
+        if (btn) btn.setAttribute('aria-expanded', String(isOpen));
     },
 
     _closeExportDropdown() {
         const menu = document.getElementById('export-dropdown-menu');
-        if (menu) menu.classList.remove('show');
+        if (menu) {
+            menu.classList.remove('show');
+            const btn = menu.previousElementSibling;
+            if (btn) btn.setAttribute('aria-expanded', 'false');
+        }
     },
 
     async exportIncident(format, scope) {
@@ -2013,12 +2096,17 @@ const App = {
 
     async submitFeedback(e) {
         e.preventDefault();
+        const form = document.getElementById('feedback-form');
+        this._clearFormErrors(form);
+
         const btn = document.getElementById('fb-submit-btn');
         const category = document.getElementById('fb-category').value;
-        const message = document.getElementById('fb-message').value.trim();
+        const msgField = document.getElementById('fb-message');
+        const message = msgField.value.trim();
 
         if (message.length < 10) {
-            UI.showToast('Bitte mindestens 10 Zeichen eingeben.', 'warning');
+            this._showFieldError(msgField, 'Bitte mindestens 10 Zeichen eingeben.');
+            msgField.focus();
             return;
         }
 
@@ -2047,6 +2135,9 @@ const App = {
         if (chevron) {
             chevron.classList.toggle('open', isHidden);
         }
+        // aria-expanded auf dem Section-Title synchronisieren
+        const title = chevron ? chevron.closest('.sidebar-section-title') : null;
+        if (title) title.setAttribute('aria-expanded', String(isHidden));
     },
 
     // === Quellenverwaltung ===
@@ -2963,6 +3054,27 @@ document.addEventListener('keydown', (e) => {
 
 document.addEventListener('keydown', (e) => {
     if (e.key === 'Escape') {
+        // Schließ-Reihenfolge: A11y-Panel > Notification-Panel > Export-Dropdown > FC-Dropdown > Modals
+        if (A11yManager._isOpen) {
+            A11yManager._closePanel();
+            return;
+        }
+        if (NotificationCenter._isOpen) {
+            NotificationCenter.close();
+            return;
+        }
+        const exportMenu = document.getElementById('export-dropdown-menu');
+        if (exportMenu && exportMenu.classList.contains('show')) {
+            App._closeExportDropdown();
+            return;
+        }
+        const fcMenu = document.querySelector('.fc-dropdown-menu.open');
+        if (fcMenu) {
+            fcMenu.classList.remove('open');
+            const fcBtn = fcMenu.previousElementSibling;
+            if (fcBtn) fcBtn.setAttribute('aria-expanded', 'false');
+            return;
+        }
         document.querySelectorAll('.modal-overlay.active').forEach(m => {
             closeModal(m.id);
         });
diff --git a/src/static/js/components.js b/src/static/js/components.js
index a24d132..494d197 100644
--- a/src/static/js/components.js
+++ b/src/static/js/components.js
@@ -26,13 +26,13 @@ const UI = {
 
         return `
             <div class="incident-item ${activeClass}" data-id="${incident.id}" onclick="App.selectIncident(${incident.id})" role="button" tabindex="0">
-                <span class="incident-dot ${dotClass}" id="dot-${incident.id}"></span>
+                <span class="incident-dot ${dotClass}" id="dot-${incident.id}" aria-hidden="true"></span>
                 <div style="flex:1;min-width:0;">
                     <div class="incident-name">${this.escape(incident.title)}</div>
                     <div class="incident-meta">${incident.article_count} Artikel &middot; ${this.escape(creator)}</div>
                 </div>
-                ${incident.visibility === 'private' ? '<span class="badge badge-private" style="font-size:9px;">PRIVAT</span>' : ''}
-                ${incident.refresh_mode === 'auto' ? '<span class="badge badge-auto" title="Auto-Refresh aktiv">&#x21bb;</span>' : ''}
+                ${incident.visibility === 'private' ? '<span class="badge badge-private" style="font-size:9px;" aria-label="Private Lage">PRIVAT</span>' : ''}
+                ${incident.refresh_mode === 'auto' ? '<span class="badge badge-auto" role="img" aria-label="Auto-Refresh aktiv">&#x21bb;</span>' : ''}
             </div>
         `;
     },
@@ -106,7 +106,7 @@ const UI = {
             </label>`;
         }).join('');
 
-        return `<button class="fc-dropdown-toggle" onclick="App.toggleFcDropdown(event)">Filter</button>
+        return `<button class="fc-dropdown-toggle" onclick="App.toggleFcDropdown(event)" aria-haspopup="true" aria-expanded="false">Filter</button>
             <div class="fc-dropdown-menu" id="fc-dropdown-menu">${items}</div>`;
     },