diff --git a/drohnenfuehrer/frontend/src/App.css b/drohnenfuehrer/frontend/src/App.css
index b3a77b8..a55ba8d 100644
--- a/drohnenfuehrer/frontend/src/App.css
+++ b/drohnenfuehrer/frontend/src/App.css
@@ -13,6 +13,11 @@
    in beiden Varianten nachgerechnet.
    ────────────────────────────────────────────────────────────────────────── */
 :root {
+  /* Sagt dem Browser, dass die Seite beide Ansichten kann. Native Bedienelemente
+     — Checkboxen, Auswahllisten, Bildlaufleisten — passen sich dadurch an,
+     statt in der Nachtansicht hell aufzublitzen. */
+  color-scheme: light dark;
+
   --font-display: Georgia, 'Times New Roman', serif;
   --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
     'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
@@ -159,9 +164,6 @@ body {
   -moz-osx-font-smoothing: grayscale;
   background: var(--color-bg);
   color: var(--color-text);
-  /* Damit auch vom Browser gestellte Bedienelemente (Bildlaufleisten,
-     Datumsauswahl, Autofill) der gewählten Ansicht folgen. */
-  color-scheme: light dark;
 }
 
 /* Formularfelder brauchen ausdrücklich Farben: ohne sie nimmt der Browser
@@ -179,6 +181,13 @@ textarea::placeholder {
   opacity: 1;
 }
 
+/* Checkbox, Radio und Schieberegler in der Markenfarbe statt im Browser-Blau. */
+input[type="checkbox"],
+input[type="radio"],
+input[type="range"] {
+  accent-color: var(--color-primary);
+}
+
 h1, h2, h3 {
   font-family: var(--font-display);
 }
diff --git a/drohnenfuehrer/frontend/src/components/admin/AdminPanel.css b/drohnenfuehrer/frontend/src/components/admin/AdminPanel.css
index 16e6fa0..5d23f9c 100644
--- a/drohnenfuehrer/frontend/src/components/admin/AdminPanel.css
+++ b/drohnenfuehrer/frontend/src/components/admin/AdminPanel.css
@@ -4,6 +4,9 @@
 
 .admin-tabs {
   display: inline-flex;
+  /* Vier Reiter passen auf schmalen Displays nicht in eine Zeile — ohne
+     Umbruch lief die Seite bei 360 px horizontal ueber. */
+  flex-wrap: wrap;
   gap: 0;
   background: var(--color-surface);
   border: 1px solid var(--color-border);
@@ -14,6 +17,7 @@
 }
 
 .tab-button {
+  min-height: var(--touch-target);
   padding: 0.5rem 1rem;
   border: none;
   background: transparent;
@@ -122,7 +126,7 @@
 .settings-section-count {
   font-size: 0.8rem;
   color: var(--color-text-muted);
-  background: var(--color-border);
+  background: var(--color-surface-alt);
   border-radius: 999px;
   padding: 0.1rem 0.5rem;
 }
@@ -164,7 +168,7 @@
   font-size: 0.75rem;
   font-weight: 700;
   color: var(--color-text-muted);
-  background: var(--color-border);
+  background: var(--color-surface-alt);
   border-radius: 50%;
   flex-shrink: 0;
 }
@@ -346,3 +350,16 @@
     opacity: 1;
   }
 }
+
+@media (max-width: 480px) {
+  .admin-tabs {
+    display: flex;
+    width: 100%;
+  }
+
+  .tab-button {
+    flex: 1 1 45%;
+    padding: 0.5rem 0.6rem;
+    font-size: 0.9rem;
+  }
+}
diff --git a/drohnenfuehrer/frontend/src/components/admin/AdminPanel.js b/drohnenfuehrer/frontend/src/components/admin/AdminPanel.js
index 01ffc5e..d36d00e 100644
--- a/drohnenfuehrer/frontend/src/components/admin/AdminPanel.js
+++ b/drohnenfuehrer/frontend/src/components/admin/AdminPanel.js
@@ -371,8 +371,8 @@ const AdminPanel = ({ users, loading, error, onRefetch }) => {
                 </div>
                 <div className="settings-section-body">
                   <div className="settings-field">
-                    <label className="settings-label">Name der App (wird in der Kopfzeile angezeigt)</label>
-                    <input
+                    <label className="settings-label" htmlFor="settings-appname">Name der App (wird in der Kopfzeile angezeigt)</label>
+                    <input id="settings-appname"
                       type="text"
                       className="settings-input"
                       value={config.appName || ''}
@@ -439,8 +439,8 @@ const AdminPanel = ({ users, loading, error, onRefetch }) => {
                         { key: 'ansprechpartner', label: 'Ansprechpartner und Koordination' }
                       ].map(({ key, label }) => (
                         <div key={key} className="settings-field">
-                          <label className="settings-label">{label}</label>
-                          <textarea
+                          <label className="settings-label" htmlFor={`settings-section-${key}`}>{label}</label>
+                          <textarea id={`settings-section-${key}`}
                             value={getSectionContent(key)}
                             onChange={(e) => updateSection(key, e.target.value)}
                             className="settings-textarea settings-textarea-lg"
diff --git a/drohnenfuehrer/frontend/src/components/admin/AuditLogs.css b/drohnenfuehrer/frontend/src/components/admin/AuditLogs.css
index 0f2d27a..78de150 100644
--- a/drohnenfuehrer/frontend/src/components/admin/AuditLogs.css
+++ b/drohnenfuehrer/frontend/src/components/admin/AuditLogs.css
@@ -231,7 +231,7 @@
 .badge-login-failed { background: #ffcdd2; color: #b71c1c; font-weight: 700; }
 .badge-import       { background: #e0f7fa; color: #00695c; }
 .badge-export       { background: #e8f5e9; color: #1b5e20; }
-.badge-bulk-update  { background: var(--color-surface-alt); color: #283593; }
+.badge-bulk-update  { background: #e8eaf6; color: #283593; }
 .badge-bulk-delete  { background: #fbe9e7; color: #bf360c; }
 .badge-password     { background: #fff8e1; color: #9c4e00; }
 .badge-default      { background: #f5f5f5; color: #616161; }
@@ -280,14 +280,25 @@
 .audit-item:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
 .audit-item-failed { border-left: 4px solid var(--color-danger); }
 
+/* Als <button> ausgezeichnet, damit das Auf- und Zuklappen auch mit der
+   Tastatur erreichbar ist. Die Button-Grundstile werden hier zurueckgesetzt. */
 .audit-item-header {
   display: flex;
   align-items: center;
   gap: 8px;
   padding: 10px 14px;
   flex-wrap: wrap;
+  width: 100%;
+  text-align: left;
+  font: inherit;
+  color: inherit;
   background: var(--color-surface-alt);
+  border: none;
   border-bottom: 1px solid var(--color-border);
+  cursor: pointer;
+}
+.audit-item-header:disabled {
+  cursor: default;
 }
 .audit-time { margin-left: auto; color: var(--color-text-muted); font-size: 12px; white-space: nowrap; }
 .expand-toggle { color: var(--color-text-muted); font-size: 11px; cursor: pointer; padding: 0 4px; }
@@ -502,13 +513,6 @@
   box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
 }
 
-.audit-item-header {
-  display: flex;
-  gap: 12px;
-  align-items: center;
-  margin-bottom: 12px;
-  flex-wrap: wrap;
-}
 
 .audit-badge {
   padding: 6px 12px;
diff --git a/drohnenfuehrer/frontend/src/components/admin/AuditLogs.js b/drohnenfuehrer/frontend/src/components/admin/AuditLogs.js
index aacd4ec..a34d59d 100644
--- a/drohnenfuehrer/frontend/src/components/admin/AuditLogs.js
+++ b/drohnenfuehrer/frontend/src/components/admin/AuditLogs.js
@@ -228,8 +228,13 @@ function AuditLogs() {
 
     return (
       <div key={log._id} className={`audit-item ${!log.success ? 'audit-item-failed' : ''}`}>
-        <div className="audit-item-header" onClick={() => hasDetail && toggleExpand(log._id)}
-             style={{ cursor: hasDetail ? 'pointer' : 'default' }}>
+        <button
+          type="button"
+          className="audit-item-header"
+          onClick={() => toggleExpand(log._id)}
+          disabled={!hasDetail}
+          aria-expanded={hasDetail ? isExpanded : undefined}
+        >
           <span className={`audit-badge ${ACTION_BADGE[log.action] || 'badge-default'}`}>
             {ACTION_ICONS[log.action]} {ACTION_LABELS[log.action] || log.action}
           </span>
@@ -244,7 +249,7 @@ function AuditLogs() {
           {hasDetail && (
             <span className="expand-toggle">{isExpanded ? '▲' : '▼'}</span>
           )}
-        </div>
+        </button>
 
         <div className="audit-item-body">
           <span className="audit-admin">👤 <strong>{log.adminUsername || '—'}</strong></span>
diff --git a/drohnenfuehrer/frontend/src/components/drohnenfuehrer/DrohnenfuehrerDashboard.js b/drohnenfuehrer/frontend/src/components/drohnenfuehrer/DrohnenfuehrerDashboard.js
index 80260e1..052220d 100644
--- a/drohnenfuehrer/frontend/src/components/drohnenfuehrer/DrohnenfuehrerDashboard.js
+++ b/drohnenfuehrer/frontend/src/components/drohnenfuehrer/DrohnenfuehrerDashboard.js
@@ -115,18 +115,18 @@ const DrohnenfuehrerDashboard = ({ drohnenfuehrerUser, onLogout }) => {
           ) : (
             <form onSubmit={handleSave} className="drohnenfuehrer-edit-form">
               <div className="form-group">
-                <label>Adresse</label>
-                <input type="text" value={formData.address}
+                <label htmlFor="profil-adresse">Adresse</label>
+                <input id="profil-adresse" type="text" value={formData.address}
                   onChange={e => setFormData({ ...formData, address: e.target.value })} required />
               </div>
               <div className="form-group">
-                <label>Mobilnummer</label>
-                <input type="tel" value={formData.phone}
+                <label htmlFor="profil-mobil">Mobilnummer</label>
+                <input id="profil-mobil" type="tel" value={formData.phone}
                   onChange={e => setFormData({ ...formData, phone: e.target.value })} required />
               </div>
               <div className="form-group">
-                <label>Festnetz (optional)</label>
-                <input type="tel" value={formData.landline}
+                <label htmlFor="profil-festnetz">Festnetz (optional)</label>
+                <input id="profil-festnetz" type="tel" value={formData.landline}
                   onChange={e => setFormData({ ...formData, landline: e.target.value })} />
               </div>
               <div className="drohnenfuehrer-form-actions">
diff --git a/drohnenfuehrer/frontend/src/components/drohnenfuehrer/DrohnenfuehrerLogin.js b/drohnenfuehrer/frontend/src/components/drohnenfuehrer/DrohnenfuehrerLogin.js
index 36b8d20..c687a3d 100644
--- a/drohnenfuehrer/frontend/src/components/drohnenfuehrer/DrohnenfuehrerLogin.js
+++ b/drohnenfuehrer/frontend/src/components/drohnenfuehrer/DrohnenfuehrerLogin.js
@@ -87,12 +87,12 @@ const DrohnenfuehrerLogin = ({ onLogin }) => {
         {mode === 'login' ? (
             <form onSubmit={handleLogin} className="drohnenfuehrer-form">
             <div className="form-group">
-              <label>E-Mail</label>
-              <input type="email" value={email} onChange={e => setEmail(e.target.value)} required autoFocus />
+              <label htmlFor="login-email">E-Mail</label>
+              <input id="login-email" type="email" value={email} onChange={e => setEmail(e.target.value)} required autoFocus />
             </div>
             <div className="form-group">
-              <label>Passwort</label>
-              <input type="password" value={password} onChange={e => setPassword(e.target.value)} required />
+              <label htmlFor="login-password">Passwort</label>
+              <input id="login-password" type="password" value={password} onChange={e => setPassword(e.target.value)} required />
             </div>
             <button type="submit" className="btn-drohnenfuehrer-primary" disabled={loading}>
               {loading ? 'Anmelden...' : 'Anmelden'}
@@ -104,20 +104,20 @@ const DrohnenfuehrerLogin = ({ onLogin }) => {
               Der Admin hat Ihre E-Mail-Adresse hinterlegt. Geben Sie hier Ihre E-Mail, den Einladungs-Token und ein neues Passwort ein.
             </p>
             <div className="form-group">
-              <label>E-Mail</label>
-              <input type="email" value={email} onChange={e => setEmail(e.target.value)} required autoFocus />
+              <label htmlFor="setpw-email">E-Mail</label>
+              <input id="setpw-email" type="email" value={email} onChange={e => setEmail(e.target.value)} required autoFocus />
             </div>
             <div className="form-group">
-              <label>Einladungs-Token</label>
-              <input type="text" value={inviteToken} onChange={e => setInviteToken(e.target.value)} required />
+              <label htmlFor="setpw-token">Einladungs-Token</label>
+              <input id="setpw-token" type="text" value={inviteToken} onChange={e => setInviteToken(e.target.value)} required />
             </div>
             <div className="form-group">
-              <label>Neues Passwort (min. 8 Zeichen)</label>
-              <input type="password" value={newPassword} onChange={e => setNewPassword(e.target.value)} required minLength={8} />
+              <label htmlFor="setpw-password">Neues Passwort (min. 8 Zeichen)</label>
+              <input id="setpw-password" type="password" value={newPassword} onChange={e => setNewPassword(e.target.value)} required minLength={8} />
             </div>
             <div className="form-group">
-              <label>Passwort wiederholen</label>
-              <input type="password" value={newPassword2} onChange={e => setNewPassword2(e.target.value)} required />
+              <label htmlFor="setpw-repeat">Passwort wiederholen</label>
+              <input id="setpw-repeat" type="password" value={newPassword2} onChange={e => setNewPassword2(e.target.value)} required />
             </div>
             <button type="submit" className="btn-drohnenfuehrer-primary" disabled={loading}>
               {loading ? 'Wird gesetzt...' : 'Passwort setzen'}
diff --git a/drohnenfuehrer/frontend/src/components/users/FilterPanel.js b/drohnenfuehrer/frontend/src/components/users/FilterPanel.js
index 5aa2129..fcc83c6 100644
--- a/drohnenfuehrer/frontend/src/components/users/FilterPanel.js
+++ b/drohnenfuehrer/frontend/src/components/users/FilterPanel.js
@@ -20,8 +20,8 @@ const FilterPanel = ({ filters, onFilterChange, showAvailableFilter = true }) =>
         </div>
       )}
       <div className="filter-group">
-        <label>Typ:</label>
-        <select
+        <label htmlFor="filter-typ">Typ:</label>
+        <select id="filter-typ"
           value={filters.type || ''}
           onChange={(e) => onFilterChange('type', e.target.value || null)}
           className="filter-select"
@@ -35,8 +35,8 @@ const FilterPanel = ({ filters, onFilterChange, showAvailableFilter = true }) =>
         </select>
       </div>
       <div className="filter-group">
-        <label>Sortierung:</label>
-        <select
+        <label htmlFor="filter-sortierung">Sortierung:</label>
+        <select id="filter-sortierung"
           value={filters.sortBy || 'name'}
           onChange={(e) => onFilterChange('sortBy', e.target.value)}
           className="filter-select"
diff --git a/nachsuche/frontend/src/App.css b/nachsuche/frontend/src/App.css
index b3a77b8..a55ba8d 100644
--- a/nachsuche/frontend/src/App.css
+++ b/nachsuche/frontend/src/App.css
@@ -13,6 +13,11 @@
    in beiden Varianten nachgerechnet.
    ────────────────────────────────────────────────────────────────────────── */
 :root {
+  /* Sagt dem Browser, dass die Seite beide Ansichten kann. Native Bedienelemente
+     — Checkboxen, Auswahllisten, Bildlaufleisten — passen sich dadurch an,
+     statt in der Nachtansicht hell aufzublitzen. */
+  color-scheme: light dark;
+
   --font-display: Georgia, 'Times New Roman', serif;
   --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
     'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
@@ -159,9 +164,6 @@ body {
   -moz-osx-font-smoothing: grayscale;
   background: var(--color-bg);
   color: var(--color-text);
-  /* Damit auch vom Browser gestellte Bedienelemente (Bildlaufleisten,
-     Datumsauswahl, Autofill) der gewählten Ansicht folgen. */
-  color-scheme: light dark;
 }
 
 /* Formularfelder brauchen ausdrücklich Farben: ohne sie nimmt der Browser
@@ -179,6 +181,13 @@ textarea::placeholder {
   opacity: 1;
 }
 
+/* Checkbox, Radio und Schieberegler in der Markenfarbe statt im Browser-Blau. */
+input[type="checkbox"],
+input[type="radio"],
+input[type="range"] {
+  accent-color: var(--color-primary);
+}
+
 h1, h2, h3 {
   font-family: var(--font-display);
 }
diff --git a/nachsuche/frontend/src/components/admin/AdminPanel.css b/nachsuche/frontend/src/components/admin/AdminPanel.css
index 16e6fa0..5d23f9c 100644
--- a/nachsuche/frontend/src/components/admin/AdminPanel.css
+++ b/nachsuche/frontend/src/components/admin/AdminPanel.css
@@ -4,6 +4,9 @@
 
 .admin-tabs {
   display: inline-flex;
+  /* Vier Reiter passen auf schmalen Displays nicht in eine Zeile — ohne
+     Umbruch lief die Seite bei 360 px horizontal ueber. */
+  flex-wrap: wrap;
   gap: 0;
   background: var(--color-surface);
   border: 1px solid var(--color-border);
@@ -14,6 +17,7 @@
 }
 
 .tab-button {
+  min-height: var(--touch-target);
   padding: 0.5rem 1rem;
   border: none;
   background: transparent;
@@ -122,7 +126,7 @@
 .settings-section-count {
   font-size: 0.8rem;
   color: var(--color-text-muted);
-  background: var(--color-border);
+  background: var(--color-surface-alt);
   border-radius: 999px;
   padding: 0.1rem 0.5rem;
 }
@@ -164,7 +168,7 @@
   font-size: 0.75rem;
   font-weight: 700;
   color: var(--color-text-muted);
-  background: var(--color-border);
+  background: var(--color-surface-alt);
   border-radius: 50%;
   flex-shrink: 0;
 }
@@ -346,3 +350,16 @@
     opacity: 1;
   }
 }
+
+@media (max-width: 480px) {
+  .admin-tabs {
+    display: flex;
+    width: 100%;
+  }
+
+  .tab-button {
+    flex: 1 1 45%;
+    padding: 0.5rem 0.6rem;
+    font-size: 0.9rem;
+  }
+}
diff --git a/nachsuche/frontend/src/components/admin/AdminPanel.js b/nachsuche/frontend/src/components/admin/AdminPanel.js
index d051a0d..06a98d2 100644
--- a/nachsuche/frontend/src/components/admin/AdminPanel.js
+++ b/nachsuche/frontend/src/components/admin/AdminPanel.js
@@ -371,8 +371,8 @@ const AdminPanel = ({ users, loading, error, onRefetch }) => {
                 </div>
                 <div className="settings-section-body">
                   <div className="settings-field">
-                    <label className="settings-label">Name der App (wird in der Kopfzeile angezeigt)</label>
-                    <input
+                    <label className="settings-label" htmlFor="settings-appname">Name der App (wird in der Kopfzeile angezeigt)</label>
+                    <input id="settings-appname"
                       type="text"
                       className="settings-input"
                       value={config.appName || ''}
@@ -439,8 +439,8 @@ const AdminPanel = ({ users, loading, error, onRefetch }) => {
                         { key: 'ansprechpartner', label: 'Ansprechpartner und Koordination' }
                       ].map(({ key, label }) => (
                         <div key={key} className="settings-field">
-                          <label className="settings-label">{label}</label>
-                          <textarea
+                          <label className="settings-label" htmlFor={`settings-section-${key}`}>{label}</label>
+                          <textarea id={`settings-section-${key}`}
                             value={getSectionContent(key)}
                             onChange={(e) => updateSection(key, e.target.value)}
                             className="settings-textarea settings-textarea-lg"
diff --git a/nachsuche/frontend/src/components/admin/AuditLogs.css b/nachsuche/frontend/src/components/admin/AuditLogs.css
index 0f2d27a..78de150 100644
--- a/nachsuche/frontend/src/components/admin/AuditLogs.css
+++ b/nachsuche/frontend/src/components/admin/AuditLogs.css
@@ -231,7 +231,7 @@
 .badge-login-failed { background: #ffcdd2; color: #b71c1c; font-weight: 700; }
 .badge-import       { background: #e0f7fa; color: #00695c; }
 .badge-export       { background: #e8f5e9; color: #1b5e20; }
-.badge-bulk-update  { background: var(--color-surface-alt); color: #283593; }
+.badge-bulk-update  { background: #e8eaf6; color: #283593; }
 .badge-bulk-delete  { background: #fbe9e7; color: #bf360c; }
 .badge-password     { background: #fff8e1; color: #9c4e00; }
 .badge-default      { background: #f5f5f5; color: #616161; }
@@ -280,14 +280,25 @@
 .audit-item:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
 .audit-item-failed { border-left: 4px solid var(--color-danger); }
 
+/* Als <button> ausgezeichnet, damit das Auf- und Zuklappen auch mit der
+   Tastatur erreichbar ist. Die Button-Grundstile werden hier zurueckgesetzt. */
 .audit-item-header {
   display: flex;
   align-items: center;
   gap: 8px;
   padding: 10px 14px;
   flex-wrap: wrap;
+  width: 100%;
+  text-align: left;
+  font: inherit;
+  color: inherit;
   background: var(--color-surface-alt);
+  border: none;
   border-bottom: 1px solid var(--color-border);
+  cursor: pointer;
+}
+.audit-item-header:disabled {
+  cursor: default;
 }
 .audit-time { margin-left: auto; color: var(--color-text-muted); font-size: 12px; white-space: nowrap; }
 .expand-toggle { color: var(--color-text-muted); font-size: 11px; cursor: pointer; padding: 0 4px; }
@@ -502,13 +513,6 @@
   box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
 }
 
-.audit-item-header {
-  display: flex;
-  gap: 12px;
-  align-items: center;
-  margin-bottom: 12px;
-  flex-wrap: wrap;
-}
 
 .audit-badge {
   padding: 6px 12px;
diff --git a/nachsuche/frontend/src/components/admin/AuditLogs.js b/nachsuche/frontend/src/components/admin/AuditLogs.js
index dc85948..a91f478 100644
--- a/nachsuche/frontend/src/components/admin/AuditLogs.js
+++ b/nachsuche/frontend/src/components/admin/AuditLogs.js
@@ -228,8 +228,13 @@ function AuditLogs() {
 
     return (
       <div key={log._id} className={`audit-item ${!log.success ? 'audit-item-failed' : ''}`}>
-        <div className="audit-item-header" onClick={() => hasDetail && toggleExpand(log._id)}
-             style={{ cursor: hasDetail ? 'pointer' : 'default' }}>
+        <button
+          type="button"
+          className="audit-item-header"
+          onClick={() => toggleExpand(log._id)}
+          disabled={!hasDetail}
+          aria-expanded={hasDetail ? isExpanded : undefined}
+        >
           <span className={`audit-badge ${ACTION_BADGE[log.action] || 'badge-default'}`}>
             {ACTION_ICONS[log.action]} {ACTION_LABELS[log.action] || log.action}
           </span>
@@ -244,7 +249,7 @@ function AuditLogs() {
           {hasDetail && (
             <span className="expand-toggle">{isExpanded ? '▲' : '▼'}</span>
           )}
-        </div>
+        </button>
 
         <div className="audit-item-body">
           <span className="audit-admin">👤 <strong>{log.adminUsername || '—'}</strong></span>
diff --git a/nachsuche/frontend/src/components/handler/HandlerDashboard.js b/nachsuche/frontend/src/components/handler/HandlerDashboard.js
index 83d3d43..0bfc24b 100644
--- a/nachsuche/frontend/src/components/handler/HandlerDashboard.js
+++ b/nachsuche/frontend/src/components/handler/HandlerDashboard.js
@@ -115,18 +115,18 @@ const HandlerDashboard = ({ handlerUser, onLogout }) => {
           ) : (
             <form onSubmit={handleSave} className="handler-edit-form">
               <div className="form-group">
-                <label>Adresse</label>
-                <input type="text" value={formData.address}
+                <label htmlFor="profil-adresse">Adresse</label>
+                <input id="profil-adresse" type="text" value={formData.address}
                   onChange={e => setFormData({ ...formData, address: e.target.value })} required />
               </div>
               <div className="form-group">
-                <label>Mobilnummer</label>
-                <input type="tel" value={formData.phone}
+                <label htmlFor="profil-mobil">Mobilnummer</label>
+                <input id="profil-mobil" type="tel" value={formData.phone}
                   onChange={e => setFormData({ ...formData, phone: e.target.value })} required />
               </div>
               <div className="form-group">
-                <label>Festnetz (optional)</label>
-                <input type="tel" value={formData.landline}
+                <label htmlFor="profil-festnetz">Festnetz (optional)</label>
+                <input id="profil-festnetz" type="tel" value={formData.landline}
                   onChange={e => setFormData({ ...formData, landline: e.target.value })} />
               </div>
               <div className="handler-form-actions">
diff --git a/nachsuche/frontend/src/components/handler/HandlerLogin.js b/nachsuche/frontend/src/components/handler/HandlerLogin.js
index 44bce21..f258542 100644
--- a/nachsuche/frontend/src/components/handler/HandlerLogin.js
+++ b/nachsuche/frontend/src/components/handler/HandlerLogin.js
@@ -87,12 +87,12 @@ const HandlerLogin = ({ onLogin }) => {
         {mode === 'login' ? (
           <form onSubmit={handleLogin} className="handler-form">
             <div className="form-group">
-              <label>E-Mail</label>
-              <input type="email" value={email} onChange={e => setEmail(e.target.value)} required autoFocus />
+              <label htmlFor="login-email">E-Mail</label>
+              <input id="login-email" type="email" value={email} onChange={e => setEmail(e.target.value)} required autoFocus />
             </div>
             <div className="form-group">
-              <label>Passwort</label>
-              <input type="password" value={password} onChange={e => setPassword(e.target.value)} required />
+              <label htmlFor="login-password">Passwort</label>
+              <input id="login-password" type="password" value={password} onChange={e => setPassword(e.target.value)} required />
             </div>
             <button type="submit" className="btn-handler-primary" disabled={loading}>
               {loading ? 'Anmelden...' : 'Anmelden'}
@@ -104,20 +104,20 @@ const HandlerLogin = ({ onLogin }) => {
               Der Admin hat Ihre E-Mail-Adresse hinterlegt. Geben Sie hier Ihre E-Mail, den Einladungs-Token und ein neues Passwort ein.
             </p>
             <div className="form-group">
-              <label>E-Mail</label>
-              <input type="email" value={email} onChange={e => setEmail(e.target.value)} required autoFocus />
+              <label htmlFor="setpw-email">E-Mail</label>
+              <input id="setpw-email" type="email" value={email} onChange={e => setEmail(e.target.value)} required autoFocus />
             </div>
             <div className="form-group">
-              <label>Einladungs-Token</label>
-              <input type="text" value={inviteToken} onChange={e => setInviteToken(e.target.value)} required />
+              <label htmlFor="setpw-token">Einladungs-Token</label>
+              <input id="setpw-token" type="text" value={inviteToken} onChange={e => setInviteToken(e.target.value)} required />
             </div>
             <div className="form-group">
-              <label>Neues Passwort (min. 8 Zeichen)</label>
-              <input type="password" value={newPassword} onChange={e => setNewPassword(e.target.value)} required minLength={8} />
+              <label htmlFor="setpw-password">Neues Passwort (min. 8 Zeichen)</label>
+              <input id="setpw-password" type="password" value={newPassword} onChange={e => setNewPassword(e.target.value)} required minLength={8} />
             </div>
             <div className="form-group">
-              <label>Passwort wiederholen</label>
-              <input type="password" value={newPassword2} onChange={e => setNewPassword2(e.target.value)} required />
+              <label htmlFor="setpw-repeat">Passwort wiederholen</label>
+              <input id="setpw-repeat" type="password" value={newPassword2} onChange={e => setNewPassword2(e.target.value)} required />
             </div>
             <button type="submit" className="btn-handler-primary" disabled={loading}>
               {loading ? 'Wird gesetzt...' : 'Passwort setzen'}
diff --git a/nachsuche/frontend/src/components/users/FilterPanel.js b/nachsuche/frontend/src/components/users/FilterPanel.js
index 5aa2129..fcc83c6 100644
--- a/nachsuche/frontend/src/components/users/FilterPanel.js
+++ b/nachsuche/frontend/src/components/users/FilterPanel.js
@@ -20,8 +20,8 @@ const FilterPanel = ({ filters, onFilterChange, showAvailableFilter = true }) =>
         </div>
       )}
       <div className="filter-group">
-        <label>Typ:</label>
-        <select
+        <label htmlFor="filter-typ">Typ:</label>
+        <select id="filter-typ"
           value={filters.type || ''}
           onChange={(e) => onFilterChange('type', e.target.value || null)}
           className="filter-select"
@@ -35,8 +35,8 @@ const FilterPanel = ({ filters, onFilterChange, showAvailableFilter = true }) =>
         </select>
       </div>
       <div className="filter-group">
-        <label>Sortierung:</label>
-        <select
+        <label htmlFor="filter-sortierung">Sortierung:</label>
+        <select id="filter-sortierung"
           value={filters.sortBy || 'name'}
           onChange={(e) => onFilterChange('sortBy', e.target.value)}
           className="filter-select"
diff --git a/stoeberhunde/frontend/src/App.css b/stoeberhunde/frontend/src/App.css
index b3a77b8..a55ba8d 100644
--- a/stoeberhunde/frontend/src/App.css
+++ b/stoeberhunde/frontend/src/App.css
@@ -13,6 +13,11 @@
    in beiden Varianten nachgerechnet.
    ────────────────────────────────────────────────────────────────────────── */
 :root {
+  /* Sagt dem Browser, dass die Seite beide Ansichten kann. Native Bedienelemente
+     — Checkboxen, Auswahllisten, Bildlaufleisten — passen sich dadurch an,
+     statt in der Nachtansicht hell aufzublitzen. */
+  color-scheme: light dark;
+
   --font-display: Georgia, 'Times New Roman', serif;
   --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
     'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
@@ -159,9 +164,6 @@ body {
   -moz-osx-font-smoothing: grayscale;
   background: var(--color-bg);
   color: var(--color-text);
-  /* Damit auch vom Browser gestellte Bedienelemente (Bildlaufleisten,
-     Datumsauswahl, Autofill) der gewählten Ansicht folgen. */
-  color-scheme: light dark;
 }
 
 /* Formularfelder brauchen ausdrücklich Farben: ohne sie nimmt der Browser
@@ -179,6 +181,13 @@ textarea::placeholder {
   opacity: 1;
 }
 
+/* Checkbox, Radio und Schieberegler in der Markenfarbe statt im Browser-Blau. */
+input[type="checkbox"],
+input[type="radio"],
+input[type="range"] {
+  accent-color: var(--color-primary);
+}
+
 h1, h2, h3 {
   font-family: var(--font-display);
 }
diff --git a/stoeberhunde/frontend/src/components/admin/AdminPanel.css b/stoeberhunde/frontend/src/components/admin/AdminPanel.css
index 16e6fa0..5d23f9c 100644
--- a/stoeberhunde/frontend/src/components/admin/AdminPanel.css
+++ b/stoeberhunde/frontend/src/components/admin/AdminPanel.css
@@ -4,6 +4,9 @@
 
 .admin-tabs {
   display: inline-flex;
+  /* Vier Reiter passen auf schmalen Displays nicht in eine Zeile — ohne
+     Umbruch lief die Seite bei 360 px horizontal ueber. */
+  flex-wrap: wrap;
   gap: 0;
   background: var(--color-surface);
   border: 1px solid var(--color-border);
@@ -14,6 +17,7 @@
 }
 
 .tab-button {
+  min-height: var(--touch-target);
   padding: 0.5rem 1rem;
   border: none;
   background: transparent;
@@ -122,7 +126,7 @@
 .settings-section-count {
   font-size: 0.8rem;
   color: var(--color-text-muted);
-  background: var(--color-border);
+  background: var(--color-surface-alt);
   border-radius: 999px;
   padding: 0.1rem 0.5rem;
 }
@@ -164,7 +168,7 @@
   font-size: 0.75rem;
   font-weight: 700;
   color: var(--color-text-muted);
-  background: var(--color-border);
+  background: var(--color-surface-alt);
   border-radius: 50%;
   flex-shrink: 0;
 }
@@ -346,3 +350,16 @@
     opacity: 1;
   }
 }
+
+@media (max-width: 480px) {
+  .admin-tabs {
+    display: flex;
+    width: 100%;
+  }
+
+  .tab-button {
+    flex: 1 1 45%;
+    padding: 0.5rem 0.6rem;
+    font-size: 0.9rem;
+  }
+}
diff --git a/stoeberhunde/frontend/src/components/admin/AdminPanel.js b/stoeberhunde/frontend/src/components/admin/AdminPanel.js
index 4ecba04..27ace87 100644
--- a/stoeberhunde/frontend/src/components/admin/AdminPanel.js
+++ b/stoeberhunde/frontend/src/components/admin/AdminPanel.js
@@ -371,8 +371,8 @@ const AdminPanel = ({ users, loading, error, onRefetch }) => {
                 </div>
                 <div className="settings-section-body">
                   <div className="settings-field">
-                    <label className="settings-label">Name der App (wird in der Kopfzeile angezeigt)</label>
-                    <input
+                    <label className="settings-label" htmlFor="settings-appname">Name der App (wird in der Kopfzeile angezeigt)</label>
+                    <input id="settings-appname"
                       type="text"
                       className="settings-input"
                       value={config.appName || ''}
@@ -439,8 +439,8 @@ const AdminPanel = ({ users, loading, error, onRefetch }) => {
                         { key: 'ansprechpartner', label: 'Ansprechpartner und Koordination' }
                       ].map(({ key, label }) => (
                         <div key={key} className="settings-field">
-                          <label className="settings-label">{label}</label>
-                          <textarea
+                          <label className="settings-label" htmlFor={`settings-section-${key}`}>{label}</label>
+                          <textarea id={`settings-section-${key}`}
                             value={getSectionContent(key)}
                             onChange={(e) => updateSection(key, e.target.value)}
                             className="settings-textarea settings-textarea-lg"
diff --git a/stoeberhunde/frontend/src/components/admin/AuditLogs.css b/stoeberhunde/frontend/src/components/admin/AuditLogs.css
index 0f2d27a..78de150 100644
--- a/stoeberhunde/frontend/src/components/admin/AuditLogs.css
+++ b/stoeberhunde/frontend/src/components/admin/AuditLogs.css
@@ -231,7 +231,7 @@
 .badge-login-failed { background: #ffcdd2; color: #b71c1c; font-weight: 700; }
 .badge-import       { background: #e0f7fa; color: #00695c; }
 .badge-export       { background: #e8f5e9; color: #1b5e20; }
-.badge-bulk-update  { background: var(--color-surface-alt); color: #283593; }
+.badge-bulk-update  { background: #e8eaf6; color: #283593; }
 .badge-bulk-delete  { background: #fbe9e7; color: #bf360c; }
 .badge-password     { background: #fff8e1; color: #9c4e00; }
 .badge-default      { background: #f5f5f5; color: #616161; }
@@ -280,14 +280,25 @@
 .audit-item:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
 .audit-item-failed { border-left: 4px solid var(--color-danger); }
 
+/* Als <button> ausgezeichnet, damit das Auf- und Zuklappen auch mit der
+   Tastatur erreichbar ist. Die Button-Grundstile werden hier zurueckgesetzt. */
 .audit-item-header {
   display: flex;
   align-items: center;
   gap: 8px;
   padding: 10px 14px;
   flex-wrap: wrap;
+  width: 100%;
+  text-align: left;
+  font: inherit;
+  color: inherit;
   background: var(--color-surface-alt);
+  border: none;
   border-bottom: 1px solid var(--color-border);
+  cursor: pointer;
+}
+.audit-item-header:disabled {
+  cursor: default;
 }
 .audit-time { margin-left: auto; color: var(--color-text-muted); font-size: 12px; white-space: nowrap; }
 .expand-toggle { color: var(--color-text-muted); font-size: 11px; cursor: pointer; padding: 0 4px; }
@@ -502,13 +513,6 @@
   box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
 }
 
-.audit-item-header {
-  display: flex;
-  gap: 12px;
-  align-items: center;
-  margin-bottom: 12px;
-  flex-wrap: wrap;
-}
 
 .audit-badge {
   padding: 6px 12px;
diff --git a/stoeberhunde/frontend/src/components/admin/AuditLogs.js b/stoeberhunde/frontend/src/components/admin/AuditLogs.js
index 1f53cf3..88c786c 100644
--- a/stoeberhunde/frontend/src/components/admin/AuditLogs.js
+++ b/stoeberhunde/frontend/src/components/admin/AuditLogs.js
@@ -228,8 +228,13 @@ function AuditLogs() {
 
     return (
       <div key={log._id} className={`audit-item ${!log.success ? 'audit-item-failed' : ''}`}>
-        <div className="audit-item-header" onClick={() => hasDetail && toggleExpand(log._id)}
-             style={{ cursor: hasDetail ? 'pointer' : 'default' }}>
+        <button
+          type="button"
+          className="audit-item-header"
+          onClick={() => toggleExpand(log._id)}
+          disabled={!hasDetail}
+          aria-expanded={hasDetail ? isExpanded : undefined}
+        >
           <span className={`audit-badge ${ACTION_BADGE[log.action] || 'badge-default'}`}>
             {ACTION_ICONS[log.action]} {ACTION_LABELS[log.action] || log.action}
           </span>
@@ -244,7 +249,7 @@ function AuditLogs() {
           {hasDetail && (
             <span className="expand-toggle">{isExpanded ? '▲' : '▼'}</span>
           )}
-        </div>
+        </button>
 
         <div className="audit-item-body">
           <span className="audit-admin">👤 <strong>{log.adminUsername || '—'}</strong></span>
diff --git a/stoeberhunde/frontend/src/components/stoeberhundefuehrer/StoeberhundefuehrerDashboard.js b/stoeberhunde/frontend/src/components/stoeberhundefuehrer/StoeberhundefuehrerDashboard.js
index 4ba7986..296e29b 100644
--- a/stoeberhunde/frontend/src/components/stoeberhundefuehrer/StoeberhundefuehrerDashboard.js
+++ b/stoeberhunde/frontend/src/components/stoeberhundefuehrer/StoeberhundefuehrerDashboard.js
@@ -115,18 +115,18 @@ const StoeberhundefuehrerDashboard = ({ stoeberhundefuehrerUser, onLogout }) =>
           ) : (
             <form onSubmit={handleSave} className="stoeberhundefuehrer-edit-form">
               <div className="form-group">
-                <label>Adresse</label>
-                <input type="text" value={formData.address}
+                <label htmlFor="profil-adresse">Adresse</label>
+                <input id="profil-adresse" type="text" value={formData.address}
                   onChange={e => setFormData({ ...formData, address: e.target.value })} required />
               </div>
               <div className="form-group">
-                <label>Mobilnummer</label>
-                <input type="tel" value={formData.phone}
+                <label htmlFor="profil-mobil">Mobilnummer</label>
+                <input id="profil-mobil" type="tel" value={formData.phone}
                   onChange={e => setFormData({ ...formData, phone: e.target.value })} required />
               </div>
               <div className="form-group">
-                <label>Festnetz (optional)</label>
-                <input type="tel" value={formData.landline}
+                <label htmlFor="profil-festnetz">Festnetz (optional)</label>
+                <input id="profil-festnetz" type="tel" value={formData.landline}
                   onChange={e => setFormData({ ...formData, landline: e.target.value })} />
               </div>
               <div className="stoeberhundefuehrer-form-actions">
diff --git a/stoeberhunde/frontend/src/components/stoeberhundefuehrer/StoeberhundefuehrerLogin.js b/stoeberhunde/frontend/src/components/stoeberhundefuehrer/StoeberhundefuehrerLogin.js
index bdd6d7e..f762d2d 100644
--- a/stoeberhunde/frontend/src/components/stoeberhundefuehrer/StoeberhundefuehrerLogin.js
+++ b/stoeberhunde/frontend/src/components/stoeberhundefuehrer/StoeberhundefuehrerLogin.js
@@ -87,12 +87,12 @@ const StoeberhundefuehrerLogin = ({ onLogin }) => {
         {mode === 'login' ? (
             <form onSubmit={handleLogin} className="stoeberhundefuehrer-form">
             <div className="form-group">
-              <label>E-Mail</label>
-              <input type="email" value={email} onChange={e => setEmail(e.target.value)} required autoFocus />
+              <label htmlFor="login-email">E-Mail</label>
+              <input id="login-email" type="email" value={email} onChange={e => setEmail(e.target.value)} required autoFocus />
             </div>
             <div className="form-group">
-              <label>Passwort</label>
-              <input type="password" value={password} onChange={e => setPassword(e.target.value)} required />
+              <label htmlFor="login-password">Passwort</label>
+              <input id="login-password" type="password" value={password} onChange={e => setPassword(e.target.value)} required />
             </div>
             <button type="submit" className="btn-stoeberhundefuehrer-primary" disabled={loading}>
               {loading ? 'Anmelden...' : 'Anmelden'}
@@ -104,20 +104,20 @@ const StoeberhundefuehrerLogin = ({ onLogin }) => {
               Der Admin hat Ihre E-Mail-Adresse hinterlegt. Geben Sie hier Ihre E-Mail, den Einladungs-Token und ein neues Passwort ein.
             </p>
             <div className="form-group">
-              <label>E-Mail</label>
-              <input type="email" value={email} onChange={e => setEmail(e.target.value)} required autoFocus />
+              <label htmlFor="setpw-email">E-Mail</label>
+              <input id="setpw-email" type="email" value={email} onChange={e => setEmail(e.target.value)} required autoFocus />
             </div>
             <div className="form-group">
-              <label>Einladungs-Token</label>
-              <input type="text" value={inviteToken} onChange={e => setInviteToken(e.target.value)} required />
+              <label htmlFor="setpw-token">Einladungs-Token</label>
+              <input id="setpw-token" type="text" value={inviteToken} onChange={e => setInviteToken(e.target.value)} required />
             </div>
             <div className="form-group">
-              <label>Neues Passwort (min. 8 Zeichen)</label>
-              <input type="password" value={newPassword} onChange={e => setNewPassword(e.target.value)} required minLength={8} />
+              <label htmlFor="setpw-password">Neues Passwort (min. 8 Zeichen)</label>
+              <input id="setpw-password" type="password" value={newPassword} onChange={e => setNewPassword(e.target.value)} required minLength={8} />
             </div>
             <div className="form-group">
-              <label>Passwort wiederholen</label>
-              <input type="password" value={newPassword2} onChange={e => setNewPassword2(e.target.value)} required />
+              <label htmlFor="setpw-repeat">Passwort wiederholen</label>
+              <input id="setpw-repeat" type="password" value={newPassword2} onChange={e => setNewPassword2(e.target.value)} required />
             </div>
             <button type="submit" className="btn-stoeberhundefuehrer-primary" disabled={loading}>
               {loading ? 'Wird gesetzt...' : 'Passwort setzen'}
diff --git a/stoeberhunde/frontend/src/components/users/FilterPanel.js b/stoeberhunde/frontend/src/components/users/FilterPanel.js
index 5aa2129..fcc83c6 100644
--- a/stoeberhunde/frontend/src/components/users/FilterPanel.js
+++ b/stoeberhunde/frontend/src/components/users/FilterPanel.js
@@ -20,8 +20,8 @@ const FilterPanel = ({ filters, onFilterChange, showAvailableFilter = true }) =>
         </div>
       )}
       <div className="filter-group">
-        <label>Typ:</label>
-        <select
+        <label htmlFor="filter-typ">Typ:</label>
+        <select id="filter-typ"
           value={filters.type || ''}
           onChange={(e) => onFilterChange('type', e.target.value || null)}
           className="filter-select"
@@ -35,8 +35,8 @@ const FilterPanel = ({ filters, onFilterChange, showAvailableFilter = true }) =>
         </select>
       </div>
       <div className="filter-group">
-        <label>Sortierung:</label>
-        <select
+        <label htmlFor="filter-sortierung">Sortierung:</label>
+        <select id="filter-sortierung"
           value={filters.sortBy || 'name'}
           onChange={(e) => onFilterChange('sortBy', e.target.value)}
           className="filter-select"