diff --git a/server.py b/server.py
index 1b1ad8e..779b787 100644
--- a/server.py
+++ b/server.py
@@ -105,6 +105,29 @@ _registry: dict[str, Path] = {}
 
 app = FastAPI(title="TTS Voice Creator - Clone and Design")
 
+# ── In-memory log buffer ───────────────────────────────────────────────────────
+_LOG_BUFFER_MAX = 400
+_log_buffer: list[dict] = []
+
+
+class _BufferHandler(logging.Handler):
+    def emit(self, record: logging.LogRecord) -> None:
+        try:
+            _log_buffer.insert(0, {
+                "ts": datetime.fromtimestamp(record.created, tz=timezone.utc).isoformat(),
+                "level": record.levelname,
+                "name": record.name,
+                "msg": record.getMessage(),
+            })
+            del _log_buffer[_LOG_BUFFER_MAX:]
+        except Exception:
+            pass
+
+
+_buf_handler = _BufferHandler()
+_buf_handler.setLevel(logging.DEBUG)
+logging.getLogger().addHandler(_buf_handler)
+
 _ROUTING_LOG_MAX = int(os.environ.get("TTS_ROUTING_LOG_MAX", "120"))
 _routing_log: list[dict] = []
 
@@ -721,6 +744,18 @@ async def clear_tts_routing_log():
     return {"ok": True, "items": []}
 
 
+@app.get("/api/logs")
+async def get_server_logs(limit: int = 200):
+    limit = max(1, min(int(limit or 200), _LOG_BUFFER_MAX))
+    return {"items": _log_buffer[:limit], "max": _LOG_BUFFER_MAX}
+
+
+@app.delete("/api/logs")
+async def clear_server_logs():
+    _log_buffer.clear()
+    return {"ok": True}
+
+
 # ── VoiceDesign virtual voice presets ─────────────────────────────────────────
 
 _DEFAULT_DESIGN_PRESETS = {
diff --git a/static/app.js b/static/app.js
index 3c53cea..014631e 100644
--- a/static/app.js
+++ b/static/app.js
@@ -517,11 +517,13 @@ async function clientAutoTrimBounds(fid) {
 
 function applyTheme(t) {
   document.documentElement.dataset.theme = t;
-  $('theme-btn').innerHTML = t === 'dark' ? '<span class="mdi mdi-weather-sunny"></span>' : '<span class="mdi mdi-weather-night"></span>';
-  $('theme-btn').title = t === 'dark' ? 'Switch to light mode' : 'Switch to dark mode';
+  const btn = $('theme-btn');
+  if (btn) { btn.innerHTML = t === 'dark' ? '<span class="mdi mdi-weather-sunny"></span>' : '<span class="mdi mdi-weather-night"></span>'; btn.title = t === 'dark' ? 'Switch to light mode' : 'Switch to dark mode'; }
+  const sel = $('s-theme-select');
+  if (sel) sel.value = t;
   localStorage.setItem('vcf-theme', t);
 }
-$('theme-btn').addEventListener('click', () =>
+$('theme-btn')?.addEventListener('click', () =>
   applyTheme(document.documentElement.dataset.theme === 'dark' ? 'light' : 'dark')
 );
 applyTheme(localStorage.getItem('vcf-theme') || 'dark');
@@ -1944,14 +1946,16 @@ async function loadSettings() {
   $('s-vd-key').value           = s.voice_design_api_key || '';
   $('s-voices-scan-dir').value  = s.voices_scan_dir      || '';
   $('s-output-dir').value       = s.output_dir           || '';
+  const themeEl = $('s-theme-select');
+  if (themeEl) themeEl.value = document.documentElement.dataset.theme || 'dark';
   await refreshTtsBackendAvailability();
+  renderSettingsAbout();
 }
 
 function markSettingsSeen() {
   localStorage.setItem(SETTINGS_SEEN_KEY, '1');
 }
 function openSettings(firstRun = false) {
-  $('settings-first-run-note').style.display = firstRun ? '' : 'none';
   if (firstRun) markSettingsSeen();
   switchTab('settings');
 }
@@ -1965,7 +1969,7 @@ document.querySelectorAll('.s-eye-btn').forEach(btn => {
     inp.type = inp.type === 'password' ? 'text' : 'password';
   });
 });
-$('settings-btn').addEventListener('click', async () => { await loadSettings(); openSettings(false); });
+$('settings-btn')?.addEventListener('click', async () => { await loadSettings(); openSettings(false); });
 $('s-close-btn').addEventListener('click', async () => { await loadSettings(); toast('Settings reloaded', 'success'); });
 $('s-use-parakeet-asr')?.addEventListener('click', () => { $('s-whisper-url').value = $('s-nvidia-asr-url').value || 'http://host.docker.internal:8092'; });
 $('s-use-nvidia-router')?.addEventListener('click', () => { const url = $('s-nvidia-router-url').value || 'http://host.docker.internal:8090'; $('s-whisper-url').value = url; $('s-nvidia-tts-url').value = url; });
@@ -2032,7 +2036,11 @@ $('s-save-btn').addEventListener('click', async () => {
   markSettingsSeen();
   renderIntegrationSnippets();
   toast('Settings saved', 'success');
-  toast('Settings saved', 'success');
+});
+
+// Theme select in General settings
+document.addEventListener('change', e => {
+  if (e.target.id === 's-theme-select') applyTheme(e.target.value);
 });
 
 // ── Voice ID field (tab 3) ────────────────────────────────────────────────
@@ -7137,6 +7145,84 @@ $('refine-restore-btn')?.addEventListener('click', () => {
   toast('Original transcription restored', 'success');
 });
 
+// ── Settings: Logs ────────────────────────────────────────────────────────
+
+let _logsLiveTimer = null;
+let _logsActiveLevel = '';
+
+function escLog(s) { return String(s).replace(/[&<>]/g, c => ({'&':'&amp;','<':'&lt;','>':'&gt;'}[c])); }
+
+window.loadSettingsLogs = async function() {
+  const viewer = $('s-log-viewer');
+  if (!viewer) return;
+  try {
+    const data = await fetch('/api/logs?limit=300').then(r => r.json());
+    const items = (data.items || []).filter(item =>
+      !_logsActiveLevel || item.level === _logsActiveLevel
+    );
+    const count = $('s-log-count');
+    if (count) count.textContent = items.length + ' entries';
+    if (!items.length) {
+      viewer.innerHTML = '<div class="s-log-empty">No log entries</div>';
+      return;
+    }
+    viewer.innerHTML = items.map(item => {
+      const ts = item.ts ? item.ts.replace('T', ' ').replace(/\.\d+Z$/, ' UTC') : '';
+      return `<div class="s-log-row">
+        <span class="s-log-ts">${escLog(ts)}</span>
+        <span class="s-log-level ${escLog(item.level)}">${escLog(item.level)}</span>
+        <span class="s-log-msg">${escLog(item.msg)}</span>
+      </div>`;
+    }).join('');
+  } catch(e) {
+    viewer.innerHTML = `<div class="s-log-empty">Failed to load logs: ${escLog(e.message)}</div>`;
+  }
+};
+
+$('s-logs-refresh-btn')?.addEventListener('click', () => loadSettingsLogs());
+
+$('s-logs-clear-btn')?.addEventListener('click', async () => {
+  await fetch('/api/logs', { method: 'DELETE' });
+  const viewer = $('s-log-viewer');
+  if (viewer) viewer.innerHTML = '<div class="s-log-empty">Logs cleared</div>';
+  const count = $('s-log-count');
+  if (count) count.textContent = '';
+});
+
+$('s-logs-live-toggle')?.addEventListener('change', function() {
+  clearInterval(_logsLiveTimer);
+  if (this.checked) {
+    loadSettingsLogs();
+    _logsLiveTimer = setInterval(loadSettingsLogs, 3000);
+  }
+});
+
+document.querySelectorAll('.s-log-filter').forEach(btn => {
+  btn.addEventListener('click', function() {
+    document.querySelectorAll('.s-log-filter').forEach(b => b.classList.remove('is-active'));
+    this.classList.add('is-active');
+    _logsActiveLevel = this.dataset.logLevel;
+    loadSettingsLogs();
+  });
+});
+
+// ── Settings: About ───────────────────────────────────────────────────────
+
+function renderSettingsAbout() {
+  const el = $('s-about-backends');
+  if (!el) return;
+  const available = new Set((_ttsBackends || []).filter(b => b.available).map(b => b.id));
+  const all = (_ttsBackends || []);
+  if (!all.length) { el.innerHTML = ''; return; }
+  el.innerHTML = all.map(b => {
+    const online = available.has(b.id);
+    return `<span class="s-about-backend ${online ? 'online' : 'offline'}">
+      <span class="mdi mdi-speaker-outline"></span>${escHtml(b.label)}
+      <span class="mdi ${online ? 'mdi-check-circle-outline' : 'mdi-close-circle-outline'}"></span>
+    </span>`;
+  }).join('');
+}
+
 // ── Voices import ──────────────────────────────────────────────────────────
 
 $('s-import-voices-file')?.addEventListener('change', async function () {
diff --git a/static/index.html b/static/index.html
index e28c4d0..a0f7422 100644
--- a/static/index.html
+++ b/static/index.html
@@ -76,14 +76,26 @@
       <div class="nav-item" data-nav-section="s-connect" onclick="navTo('s-connect')">
         <span class="nav-icon"><span class="mdi mdi-api"></span></span> Connect Apps
       </div>
-      <div class="nav-item" data-nav-section="s-settings" onclick="navTo('s-settings')">
-        <span class="nav-icon"><span class="mdi mdi-cog-outline"></span></span> Settings
+      <div class="nav-item nav-tree-head" data-nav-section="s-settings" id="nav-settings-head" onclick="navTo('s-settings')">
+        <span class="nav-icon"><span class="mdi mdi-cog-outline"></span></span>
+        <span class="nav-label">Settings</span>
+        <span class="nav-chevron" id="nav-settings-chevron"><span class="mdi mdi-chevron-down"></span></span>
+      </div>
+      <div class="nav-tree" id="nav-settings-tree">
+        <div class="nav-tree-item" data-settings-cat="general"     onclick="navSettingsCat('general')">General</div>
+        <div class="nav-tree-item" data-settings-cat="connections"  onclick="navSettingsCat('connections')">Connections</div>
+        <div class="nav-tree-item" data-settings-cat="playback"    onclick="navSettingsCat('playback')">Playback</div>
+        <div class="nav-tree-item" data-settings-cat="payloads"    onclick="navSettingsCat('payloads')">Payloads</div>
+        <div class="nav-tree-item" data-settings-cat="storage"     onclick="navSettingsCat('storage')">Storage</div>
+        <div class="nav-tree-item" data-settings-cat="apikeys"     onclick="navSettingsCat('apikeys')">API Keys</div>
+        <div class="nav-tree-item" data-settings-cat="backup"      onclick="navSettingsCat('backup')">Backup</div>
+        <div class="nav-tree-item" data-settings-cat="logs"        onclick="navSettingsCat('logs')">Logs</div>
+        <div class="nav-tree-item" data-settings-cat="about"       onclick="navSettingsCat('about')">About</div>
       </div>
     </nav>
 
     <div class="sidebar-footer">
       <button id="theme-btn" title="Switch theme" style="display:none"><span class="mdi mdi-weather-sunny"></span></button>
-      <button id="settings-btn" onclick="navTo('s-settings')" title="Open settings"><span class="mdi mdi-cog-outline"></span> Settings</button>
     </div>
   </aside>
 
diff --git a/static/nav.js b/static/nav.js
index 58184eb..4a9195c 100644
--- a/static/nav.js
+++ b/static/nav.js
@@ -37,12 +37,20 @@
     document.querySelectorAll('[data-nav-section]').forEach(function (item) {
       item.classList.toggle('active', item.dataset.navSection === sectionId);
     });
-    // Expand tree only when voices section is active
-    var tree    = document.getElementById('nav-voices-tree');
-    var chevron = document.getElementById('nav-voices-chevron');
+
+    // Voices nav tree
+    var voicesTree    = document.getElementById('nav-voices-tree');
+    var voicesChevron = document.getElementById('nav-voices-chevron');
     var isVoices = sectionId === 's-voices';
-    if (tree)    tree.classList.toggle('open', isVoices);
-    if (chevron) chevron.classList.toggle('open', isVoices);
+    if (voicesTree)    voicesTree.classList.toggle('open', isVoices);
+    if (voicesChevron) voicesChevron.classList.toggle('open', isVoices);
+
+    // Settings nav tree
+    var settingsTree    = document.getElementById('nav-settings-tree');
+    var settingsChevron = document.getElementById('nav-settings-chevron');
+    var isSettings = sectionId === 's-settings';
+    if (settingsTree)    settingsTree.classList.toggle('open', isSettings);
+    if (settingsChevron) settingsChevron.classList.toggle('open', isSettings);
 
     var main = document.getElementById('main-content');
     if (main) main.scrollTop = 0;
@@ -87,6 +95,30 @@
     set('nav-voices-count', voices.length);
   };
 
+  // ── Settings tree sub-navigation ──────────────────────────────────────────
+  window._settingsSidebarCat = null;
+
+  window.navSettingsCat = function (cat) {
+    navTo('s-settings');
+    window._settingsSidebarCat = cat;
+    document.querySelectorAll('[data-settings-cat]').forEach(function (el) {
+      el.classList.toggle('is-active', el.dataset.settingsCat === cat);
+    });
+    if (cat === 'logs' && typeof loadSettingsLogs === 'function') loadSettingsLogs();
+    // Scroll inside main-content to the target section
+    var target = document.getElementById('s-settings-' + cat);
+    if (target) {
+      setTimeout(function () {
+        var main = document.getElementById('main-content');
+        if (main) {
+          var mainRect   = main.getBoundingClientRect();
+          var targetRect = target.getBoundingClientRect();
+          main.scrollTo({ top: main.scrollTop + targetRect.top - mainRect.top - 16, behavior: 'smooth' });
+        }
+      }, 50);
+    }
+  };
+
   // Show default section on load
   showSection('s-voices');
   runSideEffects('library');
diff --git a/static/sections/s-settings.html b/static/sections/s-settings.html
index 4f2527d..ca3365c 100644
--- a/static/sections/s-settings.html
+++ b/static/sections/s-settings.html
@@ -13,15 +13,30 @@
           <div class="s-header">
             <div>
               <h2>Settings</h2>
-              <p class="s-subtitle">Configure the service URLs you use. Advanced payloads, folders, and keys are tucked away below.</p>
+              <p class="s-subtitle">Configure the service URLs you use. Advanced payloads, folders, and keys are below.</p>
             </div>
             <span class="s-stack-badge"><span class="mdi mdi-check-circle-outline"></span> Local stack</span>
           </div>
 
+          <!-- General -->
+          <div class="s-section" id="s-settings-general">
+            <div class="s-section-label">General</div>
+            <div class="settings-grid settings-behavior-grid">
+              <div class="s-field">
+                <label>Theme</label>
+                <select id="s-theme-select">
+                  <option value="light">Light</option>
+                  <option value="dark">Dark</option>
+                </select>
+                <span class="s-hint">Switch between light and dark interface.</span>
+              </div>
+            </div>
+          </div>
+
           <!-- Core connections -->
-          <div class="s-section">
-            <div class="s-section-label">Core connections</div>
-            <p class="s-section-desc">These are the endpoints you change most often. NVIDIA TTS and STT are grouped separately.</p>
+          <div class="s-section" id="s-settings-connections">
+            <div class="s-section-label">Connections</div>
+            <p class="s-section-desc">Service URLs for each backend. Change these first when setting up.</p>
 
             <div class="s-group">
               <div class="s-group-head">
@@ -131,8 +146,9 @@
           </div>
 
           <!-- Playback behavior -->
-          <div class="s-section">
-            <div class="s-section-label">Playback behavior</div>
+          <div class="s-section" id="s-settings-playback">
+            <div class="s-section-label">Playback</div>
+            <p class="s-section-desc">Controls how previews play and how OpenAI-compatible requests are shaped.</p>
             <div class="settings-grid settings-behavior-grid">
               <div class="s-field">
                 <label>TTS preview playback</label>
@@ -156,11 +172,17 @@
             </div>
           </div>
 
+          <!-- Save / Reload -->
+          <div class="btn-row settings-actions">
+            <button class="btn-primary" id="s-save-btn">Save settings</button>
+            <button class="btn-secondary" id="s-close-btn">Reload settings</button>
+          </div>
+
           <!-- Advanced payloads -->
-          <details class="s-details">
+          <details class="s-details" id="s-settings-payloads">
             <summary>
               <span class="mdi mdi-code-braces"></span>
-              <span class="s-details-title">Advanced request payloads</span>
+              <span class="s-details-title">Payloads</span>
               <small>JSON extras sent to each backend</small>
               <span class="mdi mdi-chevron-down s-details-chevron"></span>
             </summary>
@@ -209,10 +231,10 @@
           </details>
 
           <!-- Voice folders -->
-          <details class="s-details">
+          <details class="s-details" id="s-settings-storage">
             <summary>
               <span class="mdi mdi-folder-outline"></span>
-              <span class="s-details-title">Voice folders</span>
+              <span class="s-details-title">Storage</span>
               <small>container paths and Portainer volume mounts</small>
               <span class="mdi mdi-chevron-down s-details-chevron"></span>
             </summary>
@@ -231,10 +253,10 @@
           </details>
 
           <!-- API keys -->
-          <details class="s-details">
+          <details class="s-details" id="s-settings-apikeys">
             <summary>
               <span class="mdi mdi-key-outline"></span>
-              <span class="s-details-title">API keys</span>
+              <span class="s-details-title">API Keys</span>
               <small>usually empty for local containers</small>
               <span class="mdi mdi-chevron-down s-details-chevron"></span>
             </summary>
@@ -263,14 +285,8 @@
             </div>
           </details>
 
-          <!-- Actions -->
-          <div class="btn-row settings-actions">
-            <button class="btn-primary" id="s-save-btn">Save settings</button>
-            <button class="btn-secondary" id="s-close-btn">Reload settings</button>
-          </div>
-
           <!-- Backup & restore -->
-          <div class="s-section s-section-last">
+          <div class="s-section" id="s-settings-backup">
             <div class="s-section-label">Backup &amp; restore</div>
             <p class="s-hint">Export all voices and settings as a ZIP for backup or migration. Import to restore. API keys are excluded from exports.</p>
             <div class="btn-row" style="margin-top:8px;gap:10px;flex-wrap:wrap">
@@ -283,5 +299,45 @@
             </div>
           </div>
 
+          <!-- Logs -->
+          <div class="s-section" id="s-settings-logs">
+            <div class="s-section-label">Logs</div>
+            <p class="s-section-desc">Recent server activity. Useful for debugging backend connections and API errors.</p>
+            <div class="s-log-toolbar">
+              <button class="btn-secondary" id="s-logs-refresh-btn" type="button"><span class="mdi mdi-refresh"></span> Refresh</button>
+              <button class="btn-secondary" id="s-logs-clear-btn" type="button"><span class="mdi mdi-trash-can-outline"></span> Clear</button>
+              <label class="s-log-live-label">
+                <input type="checkbox" id="s-logs-live-toggle">
+                <span>Auto-refresh</span>
+              </label>
+              <span class="s-log-count" id="s-log-count"></span>
+            </div>
+            <div class="s-log-filters">
+              <button class="s-log-filter is-active" data-log-level="">All</button>
+              <button class="s-log-filter" data-log-level="ERROR">Error</button>
+              <button class="s-log-filter" data-log-level="WARNING">Warning</button>
+              <button class="s-log-filter" data-log-level="INFO">Info</button>
+            </div>
+            <div class="s-log-viewer" id="s-log-viewer">
+              <div class="s-log-empty">Click Refresh to load logs</div>
+            </div>
+          </div>
+
+          <!-- About -->
+          <div class="s-section s-section-last" id="s-settings-about">
+            <div class="s-section-label">About</div>
+            <div class="s-about-block">
+              <div class="s-about-name"><span class="mdi mdi-microphone-variant"></span> TTS Voice Creator</div>
+              <p class="s-about-desc">Clone, design, and deploy custom voices using local AI backends. Compatible with Qwen3-TTS, Kokoro FastAPI, NVIDIA Magpie, and any OpenAI-compatible TTS/STT endpoint.</p>
+              <div class="s-about-stack">
+                <span class="s-about-chip"><span class="mdi mdi-language-python"></span> FastAPI</span>
+                <span class="s-about-chip"><span class="mdi mdi-language-javascript"></span> Vanilla JS</span>
+                <span class="s-about-chip"><span class="mdi mdi-music-note"></span> WaveSurfer.js v7</span>
+                <span class="s-about-chip"><span class="mdi mdi-vector-square"></span> MDI v7.4.47</span>
+              </div>
+              <div class="s-about-backends" id="s-about-backends"></div>
+            </div>
+          </div>
+
         </div>
       </div><!-- /tab-settings -->
diff --git a/static/style.css b/static/style.css
index a730510..490e56f 100644
--- a/static/style.css
+++ b/static/style.css
@@ -376,9 +376,43 @@ audio { width: 100%; }
 .settings-param-grid textarea { min-height:58px; }
 
 /* Actions row */
-.settings-actions { display:flex; gap:10px; align-items:center; padding:20px 32px; }
+.settings-actions { display:flex; gap:10px; align-items:center; padding:20px 32px; border-top:1px solid var(--border); border-bottom:1px solid var(--border); }
 .settings-actions button { min-width:128px; }
 
+/* Log viewer */
+.s-log-toolbar { display:flex; align-items:center; gap:8px; flex-wrap:wrap; }
+.s-log-live-label { display:inline-flex; align-items:center; gap:6px; font-size:13px; color:var(--subtext); cursor:pointer; padding:0 4px; }
+.s-log-live-label input { accent-color:var(--accent); cursor:pointer; }
+.s-log-count { font-size:12px; color:var(--subtext); margin-left:auto; }
+.s-log-filters { display:flex; gap:6px; flex-wrap:wrap; }
+.s-log-filter { border:1px solid var(--border); background:transparent; color:var(--subtext); border-radius:999px; padding:3px 10px; font-size:12px; cursor:pointer; transition:all .15s; }
+.s-log-filter:hover { border-color:var(--accent); color:var(--accent); }
+.s-log-filter.is-active { background:var(--accent); border-color:var(--accent); color:#fff; }
+.s-log-viewer { background:var(--panel); border:1px solid var(--border); border-radius:var(--radius); padding:12px 14px; font-family:monospace; font-size:12px; line-height:1.6; max-height:380px; overflow-y:auto; display:flex; flex-direction:column; gap:1px; }
+.s-log-empty { color:var(--subtext); font-family:inherit; text-align:center; padding:24px 0; }
+.s-log-row { display:grid; grid-template-columns:130px 56px 1fr; gap:8px; align-items:baseline; padding:2px 0; border-bottom:1px solid color-mix(in srgb,var(--border) 50%,transparent); }
+.s-log-row:last-child { border-bottom:none; }
+.s-log-ts { color:var(--subtext); font-size:11px; white-space:nowrap; }
+.s-log-level { font-size:11px; font-weight:700; text-transform:uppercase; letter-spacing:.04em; }
+.s-log-level.ERROR, .s-log-level.CRITICAL { color:var(--red); }
+.s-log-level.WARNING { color:#f59e0b; }
+.s-log-level.INFO { color:var(--accent); }
+.s-log-level.DEBUG { color:var(--subtext); }
+.s-log-msg { color:var(--text); word-break:break-all; }
+
+/* About */
+.s-about-block { display:flex; flex-direction:column; gap:14px; max-width:640px; }
+.s-about-name { font-size:20px; font-weight:700; color:var(--text); display:flex; align-items:center; gap:8px; }
+.s-about-name .mdi { font-size:22px; color:var(--accent); }
+.s-about-desc { font-size:14px; color:var(--subtext); line-height:1.65; margin:0; }
+.s-about-stack { display:flex; flex-wrap:wrap; gap:8px; }
+.s-about-chip { display:inline-flex; align-items:center; gap:5px; background:var(--panel); border:1px solid var(--border); border-radius:var(--radius); padding:4px 10px; font-size:12px; color:var(--subtext); }
+.s-about-backends { display:flex; flex-wrap:wrap; gap:8px; }
+.s-about-backend { display:inline-flex; align-items:center; gap:6px; border:1px solid var(--border); border-radius:var(--radius); padding:5px 10px; font-size:12px; color:var(--subtext); }
+.s-about-backend.online { border-color:color-mix(in srgb,var(--green) 50%,transparent); color:var(--green); }
+.s-about-backend.offline { opacity:.55; }
+.s-about-backend .mdi { font-size:11px; }
+
 /* Responsive */
 @media (max-width:1100px) { .settings-grid.compact { grid-template-columns:1fr; } .settings-behavior-grid { grid-template-columns:1fr; } }
 @media (max-width:900px) {