diff --git a/client/src/Admin.jsx b/client/src/Admin.jsx
index def1f6f..80b3f99 100644
--- a/client/src/Admin.jsx
+++ b/client/src/Admin.jsx
@@ -1,11 +1,17 @@
-import { useState, useEffect } from 'react';
+import { useState, useEffect, useRef } from 'react';
 import './Admin.css';
 import AudioRoutingMatrix from './components/AudioRoutingMatrix';
 
 const API_URL = import.meta.env.VITE_API_URL || '/api';
 
 function Admin() {
-  const [activeTab, setActiveTab] = useState('groups');
+  // Lire l'onglet depuis l'URL hash (ex: #audio) ou utiliser 'groups' par défaut
+  const getInitialTab = () => {
+    const hash = window.location.hash.slice(1); // Enlever le #
+    return ['groups', 'audio', 'users', 'stats', 'logs'].includes(hash) ? hash : 'groups';
+  };
+
+  const [activeTab, setActiveTab] = useState(getInitialTab());
   const [groups, setGroups] = useState([]);
   const [users, setUsers] = useState([]);
   const [stats, setStats] = useState(null);
@@ -19,11 +25,10 @@ function Admin() {
   const [selectedInputDevice, setSelectedInputDevice] = useState(null);
   const [selectedOutputDevice, setSelectedOutputDevice] = useState(null);
   const [selectedSampleRate, setSelectedSampleRate] = useState(48000);
-  const [isEditingAudio, setIsEditingAudio] = useState(false);
+  const isEditingAudioRef = useRef(false);
 
   // Channel names (Phase 2.5)
   const [channelNames, setChannelNames] = useState({ inputs: {}, outputs: {} });
-  const [editingChannelNames, setEditingChannelNames] = useState(false);
 
   // Gestion formulaire nouveau groupe
   const [showGroupForm, setShowGroupForm] = useState(false);
@@ -33,6 +38,19 @@ function Admin() {
     audioBitrate: 96
   });
 
+  // Synchroniser l'onglet avec l'URL hash
+  useEffect(() => {
+    const handleHashChange = () => {
+      const hash = window.location.hash.slice(1);
+      if (['groups', 'audio', 'users', 'stats', 'logs'].includes(hash)) {
+        setActiveTab(hash);
+      }
+    };
+
+    window.addEventListener('hashchange', handleHashChange);
+    return () => window.removeEventListener('hashchange', handleHashChange);
+  }, []);
+
   // Rafraîchissement automatique
   useEffect(() => {
     loadData();
@@ -106,8 +124,8 @@ function Admin() {
     setCurrentDevice(device);
     setChannelNames(channelNamesData.channelNames || { inputs: {}, outputs: {} });
 
-    // Ne réinitialiser les sélections que si l'utilisateur n'est pas en train d'éditer
-    if (!isEditingAudio) {
+    // Ne réinitialiser les sélections que lors du chargement initial (pas en train d'éditer)
+    if (!isEditingAudioRef.current) {
       setSelectedInputDevice(device.inputDeviceId ?? null);
       setSelectedOutputDevice(device.outputDeviceId ?? null);
       setSelectedSampleRate(device.sampleRate || 48000);
@@ -216,7 +234,6 @@ function Admin() {
 
       if (res.ok) {
         alert('Noms de canaux sauvegardés avec succès!');
-        setEditingChannelNames(false);
         await loadAudioDevices();
       } else {
         const error = await res.json();
@@ -251,7 +268,7 @@ function Admin() {
       });
 
       if (res.ok) {
-        setIsEditingAudio(false); // Désactiver le mode édition
+        isEditingAudioRef.current = false; // Désactiver le mode édition
         alert('Configuration audio sauvegardée avec succès!');
         await loadAudioDevices();
       } else {
@@ -311,31 +328,31 @@ function Admin() {
       <nav className="admin-tabs">
         <button
           className={activeTab === 'groups' ? 'active' : ''}
-          onClick={() => setActiveTab('groups')}
+          onClick={() => { window.location.hash = 'groups'; setActiveTab('groups'); }}
         >
           Groupes
         </button>
         <button
           className={activeTab === 'audio' ? 'active' : ''}
-          onClick={() => setActiveTab('audio')}
+          onClick={() => { window.location.hash = 'audio'; setActiveTab('audio'); }}
         >
           Audio
         </button>
         <button
           className={activeTab === 'users' ? 'active' : ''}
-          onClick={() => setActiveTab('users')}
+          onClick={() => { window.location.hash = 'users'; setActiveTab('users'); }}
         >
           Utilisateurs ({users.length})
         </button>
         <button
           className={activeTab === 'stats' ? 'active' : ''}
-          onClick={() => setActiveTab('stats')}
+          onClick={() => { window.location.hash = 'stats'; setActiveTab('stats'); }}
         >
           Statistiques
         </button>
         <button
           className={activeTab === 'logs' ? 'active' : ''}
-          onClick={() => setActiveTab('logs')}
+          onClick={() => { window.location.hash = 'logs'; setActiveTab('logs'); }}
         >
           Logs
         </button>
@@ -438,99 +455,95 @@ function Admin() {
 
             <div className="audio-config-container">
               <div className="audio-section">
-                <h3>Carte son d'entrée (Input)</h3>
-                <select
-                  value={selectedInputDevice ?? ''}
-                  onChange={(e) => {
-                    setIsEditingAudio(true);
-                    setSelectedInputDevice(e.target.value === '' ? null : e.target.value);
-                  }}
-                  className="device-select"
-                >
-                  <option value="">-- Sélectionner une carte --</option>
-                  {audioDevices
-                    .filter(d => d.maxInputChannels > 0)
-                    .map((device, index) => (
-                      <option key={`input-${device.id}-${index}`} value={device.id}>
-                        {device.name} - {device.maxInputChannels} canaux - {device.defaultSampleRate}Hz
-                      </option>
-                    ))}
-                </select>
-                {selectedInputDevice !== null && selectedInputDevice !== '' && (
-                  <p style={{marginTop: 'var(--spacing-sm)', color: 'var(--color-text-secondary)', fontSize: '0.85rem', wordBreak: 'break-all'}}>
-                    Device ID: {selectedInputDevice}
-                  </p>
-                )}
-              </div>
+                <h3>Configuration des cartes son</h3>
 
-              <div className="audio-section">
-                <h3>Carte son de sortie (Output)</h3>
-                <select
-                  value={selectedOutputDevice ?? ''}
-                  onChange={(e) => {
-                    setIsEditingAudio(true);
-                    setSelectedOutputDevice(e.target.value === '' ? null : e.target.value);
-                  }}
-                  className="device-select"
-                >
-                  <option value="">-- Sélectionner une carte --</option>
-                  {audioDevices
-                    .filter(d => d.maxOutputChannels > 0)
-                    .map((device, index) => (
-                      <option key={`output-${device.id}-${index}`} value={device.id}>
-                        {device.name} - {device.maxOutputChannels} canaux - {device.defaultSampleRate}Hz
-                      </option>
-                    ))}
-                </select>
-                {selectedOutputDevice !== null && selectedOutputDevice !== '' && (
-                  <p style={{marginTop: 'var(--spacing-sm)', color: 'var(--color-text-secondary)', fontSize: '0.85rem', wordBreak: 'break-all'}}>
-                    Device ID: {selectedOutputDevice}
-                  </p>
-                )}
-              </div>
+                <div style={{display: 'grid', gap: 'var(--spacing-lg)', marginTop: 'var(--spacing-md)'}}>
+                  <div>
+                    <label style={{display: 'block', marginBottom: 'var(--spacing-xs)', fontSize: '0.9rem', fontWeight: 600, color: 'var(--color-text-secondary)'}}>
+                      Carte son d'entrée (Input)
+                    </label>
+                    <select
+                      value={selectedInputDevice ?? ''}
+                      onChange={(e) => {
+                        isEditingAudioRef.current = true;
+                        setSelectedInputDevice(e.target.value === '' ? null : e.target.value);
+                      }}
+                      className="device-select"
+                    >
+                      <option value="">-- Sélectionner une carte --</option>
+                      {audioDevices
+                        .filter(d => d.maxInputChannels > 0)
+                        .map((device, index) => (
+                          <option key={`input-${device.id}-${index}`} value={device.id}>
+                            {device.name} - {device.maxInputChannels} canaux - {device.defaultSampleRate}Hz
+                          </option>
+                        ))}
+                    </select>
+                    {selectedInputDevice !== null && selectedInputDevice !== '' && (
+                      <p style={{marginTop: 'var(--spacing-sm)', color: 'var(--color-text-secondary)', fontSize: '0.85rem', wordBreak: 'break-all'}}>
+                        Device ID: {selectedInputDevice}
+                      </p>
+                    )}
+                  </div>
 
-              <div className="audio-section">
-                <h3>Sample Rate</h3>
-                <select
-                  value={selectedSampleRate}
-                  onChange={(e) => {
-                    setIsEditingAudio(true);
-                    setSelectedSampleRate(parseInt(e.target.value));
-                  }}
-                  className="device-select"
-                >
-                  <option value={44100}>44100 Hz (CD quality)</option>
-                  <option value={48000}>48000 Hz (Recommended)</option>
-                  <option value={96000}>96000 Hz (High quality)</option>
-                </select>
-              </div>
+                  <div>
+                    <label style={{display: 'block', marginBottom: 'var(--spacing-xs)', fontSize: '0.9rem', fontWeight: 600, color: 'var(--color-text-secondary)'}}>
+                      Carte son de sortie (Output)
+                    </label>
+                    <select
+                      value={selectedOutputDevice ?? ''}
+                      onChange={(e) => {
+                        isEditingAudioRef.current = true;
+                        setSelectedOutputDevice(e.target.value === '' ? null : e.target.value);
+                      }}
+                      className="device-select"
+                    >
+                      <option value="">-- Sélectionner une carte --</option>
+                      {audioDevices
+                        .filter(d => d.maxOutputChannels > 0)
+                        .map((device, index) => (
+                          <option key={`output-${device.id}-${index}`} value={device.id}>
+                            {device.name} - {device.maxOutputChannels} canaux - {device.defaultSampleRate}Hz
+                          </option>
+                        ))}
+                    </select>
+                    {selectedOutputDevice !== null && selectedOutputDevice !== '' && (
+                      <p style={{marginTop: 'var(--spacing-sm)', color: 'var(--color-text-secondary)', fontSize: '0.85rem', wordBreak: 'break-all'}}>
+                        Device ID: {selectedOutputDevice}
+                      </p>
+                    )}
+                  </div>
 
-              <div className="audio-actions">
-                <button onClick={handleSaveAudioDevice} className="btn-primary">
-                  Sauvegarder la configuration
-                </button>
-              </div>
-
-              <div className="audio-section">
-                <div style={{display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 'var(--spacing-md)'}}>
-                  <h3>Nommage des canaux physiques</h3>
-                  {!editingChannelNames ? (
-                    <button onClick={() => setEditingChannelNames(true)} className="btn-secondary">
-                      Modifier les noms
-                    </button>
-                  ) : (
-                    <div style={{display: 'flex', gap: 'var(--spacing-sm)'}}>
-                      <button onClick={handleSaveChannelNames} className="btn-primary">
-                        Sauvegarder
-                      </button>
-                      <button onClick={() => { setEditingChannelNames(false); loadAudioDevices(); }} className="btn-secondary">
-                        Annuler
-                      </button>
-                    </div>
-                  )}
+                  <div>
+                    <label style={{display: 'block', marginBottom: 'var(--spacing-xs)', fontSize: '0.9rem', fontWeight: 600, color: 'var(--color-text-secondary)'}}>
+                      Sample Rate
+                    </label>
+                    <select
+                      value={selectedSampleRate}
+                      onChange={(e) => {
+                        isEditingAudioRef.current = true;
+                        setSelectedSampleRate(parseInt(e.target.value));
+                      }}
+                      className="device-select"
+                    >
+                      <option value={44100}>44100 Hz (CD quality)</option>
+                      <option value={48000}>48000 Hz (Recommended)</option>
+                      <option value={96000}>96000 Hz (High quality)</option>
+                    </select>
+                  </div>
                 </div>
 
-                <div style={{display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 'var(--spacing-xl)'}}>
+                <div className="audio-actions">
+                  <button onClick={handleSaveAudioDevice} className="btn-primary">
+                    Sauvegarder la configuration audio
+                  </button>
+                </div>
+              </div>
+
+              <div className="audio-section">
+                <h3>Nommage des canaux physiques</h3>
+
+                <div style={{display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 'var(--spacing-xl)', marginTop: 'var(--spacing-md)'}}>
                   <div>
                     <h4 style={{marginBottom: 'var(--spacing-md)', color: 'var(--color-text-secondary)'}}>
                       Entrées (Inputs) - {currentDevice.inputChannels || 0} canaux disponibles
@@ -544,10 +557,9 @@ function Admin() {
                             value={channelNames.inputs?.[i] || ''}
                             onChange={(e) => updateChannelName('inputs', i, e.target.value)}
                             placeholder={`Input ${i}`}
-                            disabled={!editingChannelNames}
                             style={{
                               padding: 'var(--spacing-sm)',
-                              background: editingChannelNames ? 'var(--color-bg)' : 'var(--color-surface-hover)',
+                              background: 'var(--color-bg)',
                               border: '1px solid var(--color-border)',
                               borderRadius: '6px',
                               color: 'var(--color-text)',
@@ -572,10 +584,9 @@ function Admin() {
                             value={channelNames.outputs?.[i] || ''}
                             onChange={(e) => updateChannelName('outputs', i, e.target.value)}
                             placeholder={`Output ${i}`}
-                            disabled={!editingChannelNames}
                             style={{
                               padding: 'var(--spacing-sm)',
-                              background: editingChannelNames ? 'var(--color-bg)' : 'var(--color-surface-hover)',
+                              background: 'var(--color-bg)',
                               border: '1px solid var(--color-border)',
                               borderRadius: '6px',
                               color: 'var(--color-text)',
@@ -587,6 +598,12 @@ function Admin() {
                     </div>
                   </div>
                 </div>
+
+                <div className="audio-actions">
+                  <button onClick={handleSaveChannelNames} className="btn-primary">
+                    Sauvegarder les noms des canaux
+                  </button>
+                </div>
               </div>
 
               <AudioRoutingMatrix groups={groups} channelNames={channelNames} />
diff --git a/client/src/components/AudioRoutingMatrix.css b/client/src/components/AudioRoutingMatrix.css
index c10f702..aa844ce 100644
--- a/client/src/components/AudioRoutingMatrix.css
+++ b/client/src/components/AudioRoutingMatrix.css
@@ -6,6 +6,13 @@
   margin-top: var(--spacing-lg);
 }
 
+.routing-actions {
+  margin-top: var(--spacing-xl);
+  display: flex;
+  justify-content: flex-start;
+  gap: var(--spacing-sm);
+}
+
 .routing-matrix-header {
   display: flex;
   justify-content: space-between;
@@ -169,9 +176,9 @@
   width: 100%;
   padding: 4px 8px;
   font-size: 0.75rem;
-  background: rgba(255, 255, 255, 0.9);
-  color: var(--color-text);
-  border: 1px solid rgba(255, 255, 255, 0.3);
+  background: rgba(59, 130, 246, 0.2);
+  color: #ffffff;
+  border: 1px solid rgba(255, 255, 255, 1);
   border-radius: 4px;
   cursor: pointer;
   font-weight: 600;
@@ -180,8 +187,9 @@
 
 .gain-select:focus {
   outline: none;
-  border-color: rgba(255, 255, 255, 0.6);
-  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.2);
+  background: rgba(59, 130, 246, 0.3);
+  border-color: rgba(255, 255, 255, 1);
+  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
 }
 
 @media (max-width: 1024px) {
diff --git a/client/src/components/AudioRoutingMatrix.jsx b/client/src/components/AudioRoutingMatrix.jsx
index 57dea72..5662f1c 100644
--- a/client/src/components/AudioRoutingMatrix.jsx
+++ b/client/src/components/AudioRoutingMatrix.jsx
@@ -194,19 +194,14 @@ function AudioRoutingMatrix({ groups, channelNames }) {
             {wsConnected ? '● Live' : '○ Offline'}
           </span>
         </div>
-        <div style={{ display: 'flex', gap: '1rem', alignItems: 'center' }}>
-          <label style={{ display: 'flex', alignItems: 'center', gap: '0.5rem', cursor: 'pointer' }}>
-            <input
-              type="checkbox"
-              checked={showOnlyNamedChannels}
-              onChange={(e) => setShowOnlyNamedChannels(e.target.checked)}
-            />
-            <span>Afficher uniquement les canaux nommés</span>
-          </label>
-          <button onClick={saveRouting} className="btn-primary">
-            Sauvegarder le routing
-          </button>
-        </div>
+        <label style={{ display: 'flex', alignItems: 'center', gap: '0.5rem', cursor: 'pointer' }}>
+          <input
+            type="checkbox"
+            checked={showOnlyNamedChannels}
+            onChange={(e) => setShowOnlyNamedChannels(e.target.checked)}
+          />
+          <span>Afficher uniquement les canaux nommés</span>
+        </label>
       </div>
 
       <div className="routing-section">
@@ -341,6 +336,12 @@ function AudioRoutingMatrix({ groups, channelNames }) {
           ))}
         </div>
       </div>
+
+      <div className="routing-actions">
+        <button onClick={saveRouting} className="btn-primary">
+          Sauvegarder le routing audio
+        </button>
+      </div>
     </div>
   );
 }
diff --git a/client/src/components/PTTButton.jsx b/client/src/components/PTTButton.jsx
index f431b9d..0f84849 100644
--- a/client/src/components/PTTButton.jsx
+++ b/client/src/components/PTTButton.jsx
@@ -22,16 +22,6 @@ export default function PTTButton({ isTalking, onPressStart, onPressEnd, audioLe
   const currentYRef = useRef(null);
   const [dragOffset, setDragOffset] = useState(0); // Offset visuel du drag (en pixels)
 
-  // Initialiser le mode selon les préférences au démarrage
-  useEffect(() => {
-    const currentSettings = loadSettings();
-    if (currentSettings.defaultPTTMode === 'continuous') {
-      setIsLockMode(true);
-      isLockModeRef.current = true;
-      console.log('Mode continu activé par défaut (préférences)');
-    }
-  }, []);
-
   useEffect(() => {
     const button = buttonRef.current;
     if (!button) return;
diff --git a/client/src/components/PWAInstallPrompt.css b/client/src/components/PWAInstallPrompt.css
index b3f1643..3d3addb 100644
--- a/client/src/components/PWAInstallPrompt.css
+++ b/client/src/components/PWAInstallPrompt.css
@@ -3,8 +3,22 @@
   bottom: 0;
   left: 0;
   right: 0;
+  top: 0;
   z-index: 1001;
-  animation: slideUp 0.3s ease;
+  background: rgba(0, 0, 0, 0.6);
+  backdrop-filter: blur(4px);
+  display: flex;
+  align-items: flex-end;
+  animation: fadeIn 0.3s ease;
+}
+
+@keyframes fadeIn {
+  from {
+    opacity: 0;
+  }
+  to {
+    opacity: 1;
+  }
 }
 
 @keyframes slideUp {
@@ -17,12 +31,14 @@
 }
 
 .pwa-prompt {
-  background: var(--bg-secondary);
+  width: 100%;
+  background: #1a1a1a;
   border-top-left-radius: 16px;
   border-top-right-radius: 16px;
   box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
   max-height: 80vh;
   overflow-y: auto;
+  animation: slideUp 0.3s ease;
 }
 
 .pwa-prompt-header {
@@ -36,13 +52,13 @@
 .pwa-prompt-header h3 {
   margin: 0;
   font-size: 1.2rem;
-  color: var(--text-primary);
+  color: #ffffff;
 }
 
 .pwa-prompt-close {
   background: none;
   border: none;
-  color: var(--text-secondary);
+  color: #9ca3af;
   cursor: pointer;
   padding: 0.5rem;
   border-radius: 8px;
@@ -50,8 +66,8 @@
 }
 
 .pwa-prompt-close:hover {
-  background: var(--bg-hover);
-  color: var(--text-primary);
+  background: rgba(255, 255, 255, 0.1);
+  color: #ffffff;
 }
 
 .pwa-prompt-content {
@@ -59,8 +75,8 @@
 }
 
 .pwa-prompt-content > p {
-  margin: 0 0 var(--spacing-lg) 0;
-  color: var(--text-secondary);
+  margin: 0 0 1.5rem 0;
+  color: #d1d5db;
   line-height: 1.6;
 }
 
@@ -73,9 +89,9 @@
 .pwa-prompt-step {
   display: flex;
   align-items: center;
-  gap: var(--spacing-md);
-  padding: var(--spacing-md);
-  background: var(--bg-hover);
+  gap: 1rem;
+  padding: 1rem;
+  background: rgba(255, 255, 255, 0.05);
   border-radius: 8px;
 }
 
@@ -85,7 +101,7 @@
   justify-content: center;
   width: 32px;
   height: 32px;
-  background: var(--primary-color);
+  background: #3b82f6;
   color: white;
   border-radius: 50%;
   font-weight: 600;
@@ -95,13 +111,13 @@
 .pwa-prompt-step p {
   flex: 1;
   margin: 0;
-  color: var(--text-primary);
+  color: #ffffff;
   font-size: 0.95rem;
 }
 
 .pwa-prompt-step svg {
   flex-shrink: 0;
-  color: var(--primary-color);
+  color: #3b82f6;
 }
 
 .pwa-prompt-footer {
diff --git a/client/src/components/Settings.jsx b/client/src/components/Settings.jsx
index e23cf7e..7768f60 100644
--- a/client/src/components/Settings.jsx
+++ b/client/src/components/Settings.jsx
@@ -4,9 +4,7 @@ import './Settings.css';
 const STORAGE_KEY = 'ptt-live-settings';
 
 const defaultSettings = {
-  defaultPTTMode: 'normal', // 'normal' ou 'continuous'
-  vibrationEnabled: true,
-  audioFeedbackEnabled: true
+  vibrationEnabled: true
 };
 
 /**
@@ -68,39 +66,6 @@ export default function Settings({ isOpen, onClose }) {
         </div>
 
         <div className="settings-content">
-          <div className="setting-section">
-            <h3>Mode PTT</h3>
-            <p className="setting-description">
-              Choisissez le mode de fonctionnement par défaut du bouton PTT
-            </p>
-
-            <label className="radio-option">
-              <input
-                type="radio"
-                name="pttMode"
-                checked={settings.defaultPTTMode === 'normal'}
-                onChange={() => handleChange('defaultPTTMode', 'normal')}
-              />
-              <div>
-                <strong>Mode normal (Push-To-Talk)</strong>
-                <p>Maintenir le bouton pour parler, relâcher pour arrêter</p>
-              </div>
-            </label>
-
-            <label className="radio-option">
-              <input
-                type="radio"
-                name="pttMode"
-                checked={settings.defaultPTTMode === 'continuous'}
-                onChange={() => handleChange('defaultPTTMode', 'continuous')}
-              />
-              <div>
-                <strong>Mode continu (verrouillé)</strong>
-                <p>Un appui active le micro en continu, un second appui le désactive</p>
-              </div>
-            </label>
-          </div>
-
           <div className="setting-section">
             <h3>Feedback</h3>
 
@@ -112,19 +77,7 @@ export default function Settings({ isOpen, onClose }) {
               />
               <div>
                 <strong>Vibrations</strong>
-                <p>Activer le retour haptique (si disponible)</p>
-              </div>
-            </label>
-
-            <label className="checkbox-option">
-              <input
-                type="checkbox"
-                checked={settings.audioFeedbackEnabled}
-                onChange={(e) => handleChange('audioFeedbackEnabled', e.target.checked)}
-              />
-              <div>
-                <strong>Feedback audio</strong>
-                <p>Sons de confirmation pour les actions</p>
+                <p>Activer le retour haptique lors du verrouillage PTT</p>
               </div>
             </label>
           </div>