diff --git a/internal/web/csp_noinline_test.go b/internal/web/csp_noinline_test.go
new file mode 100644
index 0000000..618d03a
--- /dev/null
+++ b/internal/web/csp_noinline_test.go
@@ -0,0 +1,56 @@
+package web
+
+import (
+	"embed"
+	"io/fs"
+	"regexp"
+	"strings"
+	"testing"
+)
+
+// #139 regression guards: with CSP script-src/style-src 'self' (no
+// 'unsafe-inline'), the templates must not carry inline <script> blocks or
+// style="" attributes, and the external scripts referenced must exist.
+func TestNoInlineScripts(t *testing.T) {
+	entries, err := fs.ReadDir(tmplFS, "templates")
+	if err != nil {
+		t.Fatal(err)
+	}
+	re := regexp.MustCompile(`(?s)<script[^>]*>.*?</script>`)
+	srcOnly := regexp.MustCompile(`<script[^>]+src=`)
+	for _, e := range entries {
+		b, err := fs.ReadFile(tmplFS, "templates/"+e.Name())
+		if err != nil {
+			t.Fatal(err)
+		}
+		for _, m := range re.FindAll(b, -1) {
+			if srcOnly.Match(m) {
+				continue // external script tag with src: fine
+			}
+			t.Errorf("%s: inline <script> block found (CSP #139): %q", e.Name(), string(m[:60]))
+		}
+		if strings.Contains(string(b), " onclick=") || strings.Contains(string(b), "onload=") {
+			t.Errorf("%s: inline event handler attribute found (CSP #139)", e.Name())
+		}
+		if strings.Contains(string(b), "style=\"") {
+			t.Errorf("%s: inline style attribute found (CSP #139)", e.Name())
+		}
+	}
+}
+
+func TestReferencedStaticScriptsExist(t *testing.T) {
+	entries, _ := fs.ReadDir(tmplFS, "templates")
+	var staticFiles embed.FS = staticFS
+	for _, e := range entries {
+		b, err := fs.ReadFile(tmplFS, "templates/"+e.Name())
+		if err != nil {
+			t.Fatal(err)
+		}
+		for _, m := range regexp.MustCompile(`<script src="/static/([^"]+)"`).FindAllSubmatch(b, -1) {
+			name := string(m[1])
+			if _, err := fs.ReadFile(staticFiles, "static/"+name); err != nil {
+				t.Errorf("%s references /static/%s: %v", e.Name(), name, err)
+			}
+		}
+	}
+}
diff --git a/internal/web/securityheaders_test.go b/internal/web/securityheaders_test.go
index c8b5e17..23c01cc 100644
--- a/internal/web/securityheaders_test.go
+++ b/internal/web/securityheaders_test.go
@@ -16,7 +16,7 @@ func TestSecurityHeaders(t *testing.T) {
 	h := SecurityHeaders(pages)
 	rec := httptest.NewRecorder()
 	h.ServeHTTP(rec, httptest.NewRequest("GET", "/", nil))
-	wantCSP := "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'none'"
+	wantCSP := "default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data:; frame-ancestors 'none'"
 	if got := rec.Header().Get("Content-Security-Policy"); got != wantCSP {
 		t.Errorf("CSP = %q, want %q", got, wantCSP)
 	}
diff --git a/internal/web/static/admin.js b/internal/web/static/admin.js
new file mode 100644
index 0000000..8d76cfb
--- /dev/null
+++ b/internal/web/static/admin.js
@@ -0,0 +1,74 @@
+// #99/#139: admin lock + settings panel. Key lives in sessionStorage for this visit only.
+(function () {
+  var KEY = 'palette_admin_key';
+  var keyInput = document.getElementById('admin-key');
+  var status = document.getElementById('admin-key-status');
+  var panel = document.getElementById('admin-panel');
+
+  function key() { return sessionStorage.getItem(KEY) || ''; }
+
+  function api(path, opts) {
+    opts = opts || {};
+    // allow callers to override the key header (e.g. validating a typed key, #99)
+    opts.headers = Object.assign({ 'X-Admin-Key': key() }, opts.headers || {});
+    if (opts.body) opts.headers['Content-Type'] = 'application/json';
+    return fetch(path, opts);
+  }
+
+  function loadSettings() {
+    api('/admin/api/settings').then(function (r) {
+      if (r.status !== 200) { showLock(); return; }
+      return r.json();
+    }).then(function (s) {
+      if (!s) return;
+      document.getElementById('rl-burst').value = s.rate_limit_burst;
+      document.getElementById('rl-refill').value = s.rate_limit_per_minute;
+      document.getElementById('max-content').value = s.max_content_bytes;
+      document.getElementById('default-expiry').value = s.default_expiry;
+      document.getElementById('slug-days').value = s.custom_slug_reservation_days;
+      document.getElementById('burn-window').value = s.burn_viewer_window_minutes;
+      panel.classList.remove('hidden');
+    });
+  }
+
+  function showLock() {
+    panel.classList.add('hidden');
+    sessionStorage.removeItem(KEY);
+  }
+
+  document.getElementById('admin-key-form').addEventListener('submit', function (e) {
+    e.preventDefault();
+    // #99: don't persist the key until the server accepts it
+    api('/admin/api/settings', { headers: { 'X-Admin-Key': keyInput.value } }).then(function (r) {
+      if (r.status === 200) {
+        sessionStorage.setItem(KEY, keyInput.value);
+        status.textContent = '✓';
+        keyInput.value = '';
+        loadSettings();
+      } else {
+        status.textContent = 'invalid key';
+        showLock();
+      }
+    });
+  });
+
+  document.getElementById('admin-settings-form').addEventListener('submit', function (e) {
+    e.preventDefault();
+    var body = {
+      rate_limit_burst: parseFloat(document.getElementById('rl-burst').value),
+      rate_limit_per_minute: parseFloat(document.getElementById('rl-refill').value),
+      max_content_bytes: parseInt(document.getElementById('max-content').value, 10),
+      default_expiry: document.getElementById('default-expiry').value,
+      custom_slug_reservation_days: parseInt(document.getElementById('slug-days').value, 10),
+      burn_viewer_window_minutes: parseInt(document.getElementById('burn-window').value, 10)
+    };
+    api('/admin/api/settings', { method: 'POST', body: JSON.stringify(body) }).then(function (r) {
+      document.getElementById('admin-save-status').textContent = r.status === 200 ? 'saved' : 'error';
+      if (r.status !== 200) showLock();
+    });
+  });
+
+  // #112: always show the lock on fresh load — do not auto-restore the
+  // panel from a stale sessionStorage key. The key is only written after a
+  // successful unlock (above) so in-page actions still work within this visit.
+})();
diff --git a/internal/web/static/app.css b/internal/web/static/app.css
index bdae956..03d51ee 100644
--- a/internal/web/static/app.css
+++ b/internal/web/static/app.css
@@ -725,3 +725,20 @@ button[type="submit"]:focus-visible,
 .attachment-chip:hover { border-color: var(--accent); }
 .attachment-chip .attachment-size { color: var(--muted-fg); font-size: 19px; }
 .attachment-preview img { max-width: 480px; max-height: 360px; border-radius: var(--radius); border: 1px solid var(--border); }
+
+/* #139: CSP-safe replacements for inline style attributes (style-src 'self') */
+.hidden { display: none; }
+.can-page { max-width: 900px; width: 100%; }
+.col-a { width: 260px; } .col-b { width: 140px; } .col-c { width: 120px; }
+.col-d { width: 96px; } .col-d2 { width: 150px; } .col-e { width: 190px; }
+.col-f { width: 100px; } .col-g { width: 190px; }
+.spacer-flex { flex: 1; }
+.input-num { width: 80px; }
+.input-num-sm { width: 64px; }
+.danger-hint { color: var(--danger, #c0392b); margin-top: 6px; }
+.hint-lg { font-size: 19px; }
+.mt6 { margin-top: 6px; }
+.mt18 { margin-top: 18px; }
+.toggle-inline { display: inline-flex; }
+.wrap-normal { word-break: normal; overflow-wrap: break-word; }
+.created-banner { display: block; }
diff --git a/internal/web/static/foot.js b/internal/web/static/foot.js
new file mode 100644
index 0000000..d8092ec
--- /dev/null
+++ b/internal/web/static/foot.js
@@ -0,0 +1,19 @@
+// #46: live relative-time counters: tick any [data-ts] (epoch seconds) every second
+(function () {
+  function fmt(ts) {
+    const s = Math.max(0, Math.floor(Date.now() / 1000) - ts);
+    if (s < 60) return s + 's ago';
+    if (s < 3600) return Math.floor(s / 60) + 'm ago';
+    if (s < 86400) return Math.floor(s / 3600) + 'h ago';
+    return Math.floor(s / 86400) + 'd ago';
+  }
+  function tick() {
+    document.querySelectorAll('[data-ts]').forEach(el => {
+      const ts = parseInt(el.dataset.ts, 10);
+      if (!isNaN(ts)) el.textContent = fmt(ts);
+    });
+  }
+  setInterval(tick, 1000);
+  document.addEventListener('DOMContentLoaded', tick);
+  tick();
+})();
diff --git a/internal/web/static/history.js b/internal/web/static/history.js
new file mode 100644
index 0000000..4e6b719
--- /dev/null
+++ b/internal/web/static/history.js
@@ -0,0 +1,20 @@
+// #139: public history table + 30s auto-refresh.
+const t = PaletteTable.init({
+  endpoint: '/api/public',
+  perPage: 25,
+  hasPager: true,
+  rowHtml: it =>
+    `<tr class="row" data-href="/${t.esc(it.id)}"><td>` +
+    (it.title
+      ? `${t.esc(it.title)}${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`
+      : `<a class="slug paste-name" href="/${t.esc(it.id)}">${t.esc(it.id)}</a>${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`) +
+    `</td>` +
+    `<td><span class="badge">${t.esc(it.language || 'text')}</span></td>` +
+    `<td class="dim">${t.fmtSize(it.size)}</td><td class="dim">${it.view_count}</td><td class="dim" data-ts="${it.created_at}">${t.ago(it.created_at)}</td>` +
+    (it.custom_slug ? `<td><a class="slug url-link" href="/${t.esc(it.custom_slug)}">/${t.esc(it.custom_slug)}</a></td>` : `<td class="dim">none</td>`) +
+    `<td class="dim"><a class="id-link" href="/${t.esc(it.id)}">${t.esc(it.id)}</a></td></tr>`,
+  emptyFiltered: 'No pastes match your search.',
+  emptyAll: 'No pastes yet. Create the first one.',
+});
+t.load();
+setInterval(t.load, 30000); // auto-refresh history every 30s
diff --git a/internal/web/static/mine.js b/internal/web/static/mine.js
new file mode 100644
index 0000000..9967d4b
--- /dev/null
+++ b/internal/web/static/mine.js
@@ -0,0 +1,46 @@
+// #139: saved pastes table.
+function toast(msg, kind) {
+  let t = document.querySelector('.toast');
+  if (!t) { t = document.createElement('div'); t.className = 'toast'; document.body.appendChild(t); }
+  t.textContent = msg;
+  t.classList.remove('success', 'error');
+  if (kind === 'success') t.classList.add('success');
+  if (kind === 'error') t.classList.add('error');
+  t.classList.add('show');
+  clearTimeout(t._h);
+  t._h = setTimeout(() => t.classList.remove('show'), 2000);
+}
+
+const t = PaletteTable.init({
+  endpoint: '/api/mine',
+  perPage: 25,
+  hasPager: true,
+  rowHtml: it =>
+    `<tr class="row" data-href="/${t.esc(it.id)}"><td>` +
+    (it.title
+      ? `${t.esc(it.title)}${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`
+      : `<a class="slug paste-name" href="/${t.esc(it.id)}">${t.esc(it.id)}</a>${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`) +
+    `</td>` +
+    `<td><span class="badge">${t.esc(it.language || 'text')}</span></td>` +
+    `<td class="dim">${t.fmtSize(it.size)}</td><td class="dim" data-ts="${it.created_at}">${t.ago(it.created_at)}</td>` +
+    (it.custom_slug ? `<td><a class="slug url-link" href="/${t.esc(it.custom_slug)}">/${t.esc(it.custom_slug)}</a></td>` : `<td class="dim">none</td>`) +
+    `<td class="dim"><a class="id-link" href="/${t.esc(it.id)}">${t.esc(it.id)}</a></td>` +
+    `<td><button class="btn btn-icon del" data-id="${t.esc(it.id)}" title="Delete paste" aria-label="Delete paste">&times;</button></td></tr>`,
+  emptyFiltered: 'No pastes from this browser match your search.',
+  emptyAll: 'No pastes from this browser yet.',
+});
+
+// delete buttons (viewer-scoped, enforced server-side #37)
+document.getElementById('rows').addEventListener('click', async e => {
+  const del = e.target.closest('button.del');
+  if (!del) return;
+  e.stopPropagation();
+  del.disabled = true;
+  try {
+    const res = await fetch('/api/pastes/' + del.dataset.id, { method: 'DELETE' });
+    if (res.ok) { toast('Deleted', 'success'); t.load(); }
+    else { toast('Delete failed', 'error'); del.disabled = false; }
+  } catch (err) { toast('Delete failed', 'error'); del.disabled = false; }
+});
+
+t.load();
diff --git a/internal/web/static/new.js b/internal/web/static/new.js
new file mode 100644
index 0000000..16bbd47
--- /dev/null
+++ b/internal/web/static/new.js
@@ -0,0 +1,398 @@
+// #139: editor page logic (gutter, expiry, burn, attachments, create).
+const $ = id => document.getElementById(id);
+const content = $('content'), gutter = $('gutter');
+
+function updateGutter() {
+  const lines = content.value.split('\n').length;
+  let s = '';
+  for (let i = 1; i <= Math.max(lines, 1); i++) s += i + '\n';
+  gutter.textContent = s;
+}
+content.addEventListener('input', updateGutter);
+updateGutter();
+
+function toast(msg, kind) {
+  let t = document.querySelector('.toast');
+  if (!t) { t = document.createElement('div'); t.className = 'toast'; document.body.appendChild(t); }
+  t.textContent = msg;
+  t.classList.remove('success', 'error');
+  if (kind === 'success') t.classList.add('success');
+  if (kind === 'error') t.classList.add('error');
+  t.classList.add('show');
+  clearTimeout(t._h);
+  t._h = setTimeout(() => t.classList.remove('show'), 2000);
+}
+const setHidden = (id, hid) => { const el = $(id); if (el) el.classList.toggle('hidden', hid); };
+$('haspw').addEventListener('change', e => setHidden('pwrow', !e.target.checked));
+$('burn').addEventListener('change', e => setHidden('burnrow', !e.target.checked));
+document.querySelectorAll('input[name="exp"]').forEach(r => r.addEventListener('change', () => {
+  setHidden('customexp-row', document.querySelector('input[name="exp"]:checked').value !== 'custom');
+  setHidden('customexp-err', true);
+}));
+
+// compose the expires_in Go-duration string when Custom is checked (#48).
+// Returns the string, or null with an inline error shown.
+function composeCustomExpiry() {
+  const n = parseInt($('expnum').value, 10);
+  const unit = $('expunit').value;
+  let mins = NaN;
+  if (n > 0) {
+    if (unit === 'm') mins = n;
+    else if (unit === 'h') mins = n * 60;
+    else if (unit === 'd') mins = n * 1440;
+    else if (unit === 'w') mins = n * 10080;
+    else if (unit === 'mo') mins = n * 43200; // months counted as 30 days
+  }
+  const err = $('customexp-err');
+  if (!(mins >= 1)) {
+    err.textContent = 'Enter a duration of at least 1 minute.';
+    err.classList.remove('hidden');
+    return null;
+  }
+  if (mins > 525600) { // more than 1 year
+    err.textContent = 'Custom expiry cannot exceed 1 year.';
+    err.classList.remove('hidden');
+    return null;
+  }
+  err.classList.add('hidden');
+  // compose as h (+d/m remainders); Go parses '336h', '90m', '6h30m' fine
+  const hours = Math.floor(mins / 60), rem = mins % 60;
+  if (rem === 0) return hours + 'h';
+  if (hours === 0) return rem + 'm';
+  return hours + 'h' + rem + 'm';
+}
+
+$('pwreveal').addEventListener('click', () => {
+  const pw = $('password');
+  const show = pw.type === 'password';
+  pw.type = show ? 'text' : 'password';
+  $('pwreveal').classList.toggle('off', !show);
+  $('pwreveal').title = show ? 'Hide password' : 'Show password';
+});
+
+let guessed = ''; // last auto-detected language, '' = user override
+
+// #105: map backend machine-readable error codes to plain-language guidance.
+// Unknown codes fall back to a generic message; the technical detail stays
+// in the API response for API consumers.
+const ERROR_MESSAGES = {
+  slug_taken: 'That Custom URL is already taken. Try another.',
+  slug_reserved: 'That Custom URL is reserved. Try another.',
+  slug_invalid: 'Please keep the Custom URL under 64 characters, using only letters, numbers, dashes, or underscores.',
+  content_empty: 'Write or paste something first.',
+  content_too_large: 'This paste is too large. The limit is 5 MB.',
+  file_too_large: 'File is too large. The limit is 25 MB.',
+  one_file_only: 'Choose either text or a file for now.',
+  expiry_invalid: 'Please pick an expiry between 1 minute and 1 year.',
+  rate_limited: 'Too many tries. Wait a minute and try again.',
+};
+const GENERIC_ERROR = 'Something went wrong. Please try again.';
+
+function friendlyError(data) {
+  return ERROR_MESSAGES[data && data.code] || GENERIC_ERROR;
+}
+
+// #105: color the result box by outcome — success (ok), error (err),
+// warning (warn) — with a colored left border (CSS .result-ok/.result-err).
+function setResultKind(kind) {
+  const card = $('result-card');
+  card.classList.remove('result-ok', 'result-err', 'result-warn');
+  if (kind) card.classList.add('result-' + kind);
+}
+
+function showResult(html, kind) {
+  $('result').innerHTML = html;
+  $('result').dataset.token = kind === 'ok' ? ($('result').dataset.token || '') : ($('result').dataset.token || '');
+  setHidden('result-card', false);
+  setResultKind(kind === 'ok' ? 'ok' : (kind === 'warn' ? 'warn' : 'err'));
+}
+function defaultFilename(lang) {
+  const names = {
+    python: 'Python.py', go: 'main.go', javascript: 'script.js', typescript: 'index.ts',
+    rust: 'main.rs', c: 'main.c', cpp: 'main.cpp', java: 'Main.java', bash: 'script.sh',
+    sql: 'query.sql', yaml: 'config.yaml', json: 'data.json', html: 'index.html',
+    css: 'style.css', xml: 'doc.xml', php: 'index.php', ruby: 'main.rb',
+    perl: 'main.pl', lua: 'main.lua', dockerfile: 'Dockerfile', toml: 'config.toml',
+    ini: 'config.ini', diff: 'changes.diff',
+    markdown: 'notes.md', text: 'Text.txt',
+  };
+  return names[lang] || '';
+}
+// fill default filename when title is still blank
+function maybeSetDefaultTitle(lang) {
+  const title = $('title');
+  if (lang && !title.value.trim()) {
+    const fn = defaultFilename(lang);
+    if (fn) title.value = fn;
+  }
+}
+
+async function guessLang() {
+  if (!content.value.trim()) return;
+  try {
+    const res = await fetch('/api/guess-language', {
+      method: 'POST',
+      headers: {'Content-Type': 'application/json'},
+      body: JSON.stringify({content: content.value}),
+    });
+    const data = await res.json();
+    if (res.ok && data.language) {
+      guessed = data.language;
+      $('language').value = data.language;
+      maybeSetDefaultTitle(data.language);
+    }
+  } catch(e) {}
+}
+
+// refresh button: always re-detect, even if user picked something
+$('reguess').addEventListener('click', guessLang);
+
+// auto-guess when pasting into the editor
+content.addEventListener('paste', () => setTimeout(guessLang, 0));
+
+async function create() {
+  // #4: can mode — bundle the editor + extra items into a can via multipart
+  if ($('iscan').checked) return createCan();
+  // #38: file attached -> file paste (1 file = 1 paste; text is ignored)
+  if (attachedFile) return createFilePaste();
+
+  const body = {
+    content: content.value,
+    title: $('title').value || null,
+    language: $('language').value || null,
+    custom_slug: $('custom').value || null,
+    burn_after_read: $('burn').checked,
+  };
+  if ($('burn').checked) body.burn_after_reads = parseInt($('burnreads').value, 10) || 1;
+  if ($('haspw').checked) body.password = $('password').value;
+  const exp = document.querySelector('input[name="exp"]:checked').value;
+  if (exp === 'custom') {
+    const dur = composeCustomExpiry();
+    if (dur === null) { toast('Check the custom expiry', 'error'); return; }
+    body.expires_in = dur;
+  } else if (exp) {
+    body.expires_in = exp;
+  }
+
+  const res = await fetch('/api/pastes', {
+    method: 'POST',
+    headers: {'Content-Type': 'application/json'},
+    body: JSON.stringify(body),
+  });
+  const data = await res.json();
+  if (!res.ok) {
+    showResult(friendlyError(data), 'err');
+    toast('Create failed', 'error');
+    return;
+  }
+  finishCreate(data);
+}
+
+// shared success handling for both create paths (#38): result box, copy
+// button, password auto-unlock, then redirect to the paste.
+function finishCreate(data) {
+  const url = location.origin + '/' + (data.custom_slug || data.id);
+  showResult('<a href="' + url + '">' + url + '</a> <button class="btn btn-icon" id="result-copy" title="Copy URL" type="button">⧉</button>', 'ok');
+  $('result').dataset.token = data.deletion_token || '';
+  const copyBtn = document.getElementById('result-copy');
+  copyBtn.addEventListener('click', () => {
+    try {
+      navigator.clipboard.writeText(url);
+      copyBtn.classList.add('ok');               // in-place success feedback (#53)
+      copyBtn.textContent = 'Success!';
+      setTimeout(() => { copyBtn.classList.remove('ok'); copyBtn.textContent = '⧉'; }, 2000);
+    } catch(e) { toast('Copy failed', 'error'); }
+  });
+  // token carried via sessionStorage, never in the URL (#143)
+  const dest = '/' + data.id + '?created=1';
+  try { sessionStorage.setItem('deletion_token_' + data.id, data.deletion_token || ''); } catch(e) {}
+  // password-protected: unlock now with the password we already have (#26)
+  if ($('haspw').checked && data.id) {
+    const fd = new FormData();
+    fd.append('password', $('password').value);
+    fd.append('next', dest);
+    try {
+      fetch('/' + data.id, {method: 'POST', body: fd}).finally(() => { location.href = dest; });
+      return;
+    } catch(e) {}
+  }
+  // show the paste
+  location.href = dest;
+}
+$('create').addEventListener('click', create);
+
+// #38: file attachment support — 1 file = 1 paste. Three input paths:
+// Ctrl+V paste of a file, upload button (file picker), drag-and-drop.
+const MAX_FILE_BYTES = 25 * 1024 * 1024;
+let attachedFile = null; // the single attached File, or null
+
+function humanSize(n) {
+  if (n >= 1048576) return (n / 1048576).toFixed(1) + ' MB';
+  if (n >= 1024) return (n / 1024).toFixed(1) + ' KB';
+  return n + ' B';
+}
+
+function setAttachedFile(file) {
+  if (!file) return clearAttachedFile();
+  if (file.size > MAX_FILE_BYTES) {
+    toast('File is too large. The limit is 25 MB.', 'error');
+    return;
+  }
+  attachedFile = file;
+  renderFileChip();
+  setHidden('file-text-note', false);
+}
+
+function clearAttachedFile() {
+  attachedFile = null;
+  $('file-input').value = '';
+  renderFileChip();
+  setHidden('file-text-note', true);
+}
+
+function renderFileChip() {
+  const slot = $('file-chip-slot');
+  slot.innerHTML = '';
+  if (!attachedFile) return;
+  const chip = document.createElement('div');
+  chip.className = 'file-chip';
+  chip.innerHTML = '<span class="file-chip-name"></span>' +
+    '<span class="file-chip-size">' + humanSize(attachedFile.size) + '</span>' +
+    '<button type="button" class="file-chip-remove" title="Remove file">&times;</button>';
+  chip.querySelector('.file-chip-name').textContent = attachedFile.name;
+  chip.querySelector('.file-chip-remove').addEventListener('click', clearAttachedFile);
+  slot.appendChild(chip);
+}
+
+// (1) file picker via the dropzone click
+$('dropzone').addEventListener('click', () => $('file-input').click());
+$('file-input').addEventListener('change', () => {
+  if ($('file-input').files.length) setAttachedFile($('file-input').files[0]);
+});
+
+// (2) drag-and-drop onto the dropzone (and the page broadly)
+const dz = $('dropzone');
+['dragenter', 'dragover'].forEach(ev => {
+  document.addEventListener(ev, e => {
+    if (!e.dataTransfer || ![...e.dataTransfer.types].includes('Files')) return;
+    e.preventDefault();
+    dz.classList.add('dragover');
+  });
+});
+['dragleave', 'drop'].forEach(ev => {
+  document.addEventListener(ev, e => {
+    if (ev === 'drop') e.preventDefault();
+    if (e.target === dz || ev === 'drop') dz.classList.remove('dragover');
+  });
+});
+document.addEventListener('drop', e => {
+  if (!e.dataTransfer || !e.dataTransfer.files.length) return;
+  e.preventDefault();
+  setAttachedFile(e.dataTransfer.files[0]);
+});
+
+// (3) Ctrl+V of a file anywhere on the page
+document.addEventListener('paste', e => {
+  const files = e.clipboardData && e.clipboardData.files;
+  if (!files || !files.length) return; // normal text paste into the editor
+  e.preventDefault();
+  setAttachedFile(files[0]);
+});
+
+// file create path: POST multipart. 1 file = 1 paste: when a file is
+// attached the editor text is ignored (server enforces this too).
+async function createFilePaste() {
+  const fd = new FormData();
+  fd.append('file', attachedFile);
+  if ($('title').value) fd.append('title', $('title').value);
+  if ($('custom').value) fd.append('custom_slug', $('custom').value);
+  if ($('haspw').checked) fd.append('password', $('password').value);
+  if ($('burn').checked) {
+    fd.append('burn_after_read', 'true');
+    fd.append('burn_after_reads', String(parseInt($('burnreads').value, 10) || 1));
+  }
+  if ($('unlisted').checked) fd.append('visibility', 'unlisted');
+  const exp = document.querySelector('input[name="exp"]:checked').value;
+  if (exp === 'custom') {
+    const dur = composeCustomExpiry();
+    if (dur === null) { toast('Check the custom expiry', 'error'); return; }
+    fd.append('expires_in', dur);
+  } else if (exp) {
+    fd.append('expires_in', exp);
+  }
+  const res = await fetch('/api/pastes', { method: 'POST', body: fd });
+  const data = await res.json();
+  if (!res.ok) {
+    showResult(friendlyError(data), 'err');
+    toast('Create failed', 'error');
+    return;
+  }
+  finishCreate(data);
+}
+
+// #4: can creation — POST multipart to /api/pastes/can. The main editor is
+// the first item; each extra can-item row is another text item.
+async function createCan() {
+  const items = [];
+  if (content.value.trim()) {
+    items.push({title: $('title').value || 'main', content: content.value, language: $('language').value || ''});
+  }
+  document.querySelectorAll('#can-items .can-item-row').forEach(row => {
+    const t = row.querySelector('.can-item-title').value.trim();
+    const c = row.querySelector('.can-item-content').value;
+    if (c.trim()) items.push({title: t || ('item-' + (items.length + 1)), content: c});
+  });
+  if (!items.length) { toast('Nothing to put in the can', 'error'); return; }
+
+  const fd = new FormData();
+  fd.append('title', $('title').value || 'Untitled can');
+  fd.append('json_items', JSON.stringify(items));
+  if ($('haspw').checked) fd.append('password', $('password').value);
+  if ($('unlisted').checked) fd.append('visibility', 'unlisted');
+  const exp = document.querySelector('input[name="exp"]:checked').value;
+  if (exp === 'custom') {
+    const dur = composeCustomExpiry();
+    if (dur === null) { toast('Check the custom expiry', 'error'); return; }
+    if (dur) fd.append('expires_in', dur);
+  } else if (exp) {
+    fd.append('expires_in', exp);
+  }
+  if ($('custom').value.trim()) fd.append('custom_slug', $('custom').value.trim());
+
+  const res = await fetch('/api/pastes/can', {method: 'POST', body: fd});
+  const data = await res.json();
+  if (!res.ok) {
+    showResult(friendlyError(data), 'err');
+    toast('Can create failed', 'error');
+    return;
+  }
+  const url = location.origin + data.url;
+  showResult('<a href="' + url + '">' + url + '</a> <button class="btn btn-icon" id="result-copy" title="Copy URL" type="button">⧉</button>', 'ok');
+  const copyBtn = document.getElementById('result-copy');
+  copyBtn.addEventListener('click', () => {
+    try {
+      navigator.clipboard.writeText(url);
+      copyBtn.classList.add('ok');
+      copyBtn.textContent = 'Success!';
+      setTimeout(() => { copyBtn.classList.remove('ok'); copyBtn.textContent = '⧉'; }, 2000);
+    } catch(e) { toast('Copy failed', 'error'); }
+  });
+  // password-protected can: unlock now with the password we already have (#26 parity)
+  if ($('haspw').checked && data.id) {
+    const pd = new FormData();
+    pd.append('password', $('password').value);
+    try { await fetch('/can/' + data.id, {method: 'POST', body: pd}); } catch(e) {}
+  }
+  location.href = data.url;
+}
+// reset stale result state when returning via Back (bfcache) (#28)
+window.addEventListener('pageshow', e => {
+  if (!e.persisted) return;
+  const rc = document.getElementById('result-card');
+  if (rc) rc.classList.add('hidden');
+  const r = document.getElementById('result');
+  if (r) { r.innerHTML = 'empty'; delete r.dataset.token; }
+});
+document.addEventListener('keydown', e => {
+  if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') { e.preventDefault(); create(); }
+});
diff --git a/internal/web/static/paste.js b/internal/web/static/paste.js
new file mode 100644
index 0000000..e5350e7
--- /dev/null
+++ b/internal/web/static/paste.js
@@ -0,0 +1,47 @@
+// #53/#139: paste viewer page logic. Paste id arrives via <body data-paste-id>.
+function toast(msg) {
+  let t = document.querySelector('.toast');
+  if (!t) { t = document.createElement('div'); t.className = 'toast'; document.body.appendChild(t); }
+  t.textContent = msg;
+  t.classList.add('show');
+  clearTimeout(t._h);
+  t._h = setTimeout(() => t.classList.remove('show'), 2000);
+}
+function toggleStats() {
+  const body = document.getElementById('stats-body');
+  const pill = document.getElementById('stats-pill');
+  const btn = document.getElementById('stats-toggle');
+  const open = body.hidden;
+  body.hidden = !open;
+  pill.classList.toggle('open', open);
+  btn.setAttribute('aria-expanded', open ? 'true' : 'false');
+}
+function copyContent(btn) {
+  navigator.clipboard.writeText(document.getElementById('raw-content').value);
+  // in-place success feedback (#53)
+  if (btn) {
+    btn.classList.add('ok');
+    btn.textContent = 'Success!';
+    clearTimeout(btn._okh);
+    btn._okh = setTimeout(() => { btn.classList.remove('ok'); btn.textContent = 'copy'; }, 2000);
+  } else {
+    toast('Copied', 'success');
+  }
+}
+function redeem() {
+  if (!confirm('Hard delete this paste immediately?')) return;
+  let tok = '';
+  try { tok = sessionStorage.getItem('deletion_token_' + PASTE_ID) || ''; } catch(e) {}
+  if (!tok) { alert('deletion token not available in this browser'); return; }
+  fetch('/api/pastes/' + PASTE_ID + '/redeem', {method: 'DELETE', headers: {'Authorization': 'Bearer ' + tok}})
+    .then(r => { if (r.ok) location.href = '/history'; else alert('delete failed'); });
+}
+
+// wiring (moved from inline handlers for CSP #139)
+var PASTE_ID = document.currentScript.getAttribute('data-paste-id');
+var copyBtn = document.getElementById('copy-btn');
+if (copyBtn) copyBtn.addEventListener('click', function (e) { e.preventDefault(); copyContent(copyBtn); });
+var delBtn = document.getElementById('delete-btn');
+if (delBtn) delBtn.addEventListener('click', function (e) { e.preventDefault(); redeem(); });
+var statsToggle = document.getElementById('stats-toggle');
+if (statsToggle) statsToggle.addEventListener('click', toggleStats);
diff --git a/internal/web/static/settings.js b/internal/web/static/settings.js
new file mode 100644
index 0000000..58900b7
--- /dev/null
+++ b/internal/web/static/settings.js
@@ -0,0 +1,101 @@
+// #112/#127/#139: theme switcher. Swatch colors are derived from computed CSS vars per preset.
+(function () {
+  // #112: derive each preset's swatches from the real CSS variables in
+  // app.css by temporarily applying data-preset, so they can never drift.
+  // #127: 5 theme pairs, light swatches top row, dark bottom row.
+  var pairs = [
+    { id: 'midnight',        name: 'Midnight' },
+    { id: 'smooth',          name: 'Smooth' },
+    { id: 'pastel-lavender', name: 'Pastel Lavender' },
+    { id: 'pastel-peach',    name: 'Pastel Peach' },
+    { id: 'pastel-cloud',    name: 'Pastel Cloud' }
+  ];
+  var SWATCH_VARS = ['--bg', '--surface', '--surface-2', '--muted', '--accent'];
+
+  function presetColors(id) {
+    var root = document.documentElement;
+    var prev = root.getAttribute('data-preset');
+    root.setAttribute('data-preset', id);
+    var cs = getComputedStyle(root);
+    var colors = SWATCH_VARS.map(function (v) { return cs.getPropertyValue(v).trim(); });
+    if (prev === null) root.removeAttribute('data-preset'); else root.setAttribute('data-preset', prev);
+    return colors;
+  }
+
+  // current base pair + dark flag from the resolved data-preset.
+  // "midnight" is itself the dark variant, so check dark ids first.
+  function state() {
+    var p = document.documentElement.dataset.preset || 'midnight';
+    if (p === 'midnight' || /-dark$/.test(p)) {
+      return { base: p === 'midnight' ? 'midnight' : p.replace(/-dark$/, ''), dark: true };
+    }
+    return { base: p === 'midnight-light' ? 'midnight' : p, dark: false };
+  }
+
+  var grid = document.getElementById('theme-grid');
+  var cards = {};
+  // #132: midnight is dark-first (root preset = midnight = dark; its light
+  // variant is midnight-light), the others are light-first. Resolve the
+  // LIGHT and DARK preset ids generically so the light swatches always
+  // render in the top row of every card.
+  function lightPreset(id) {
+    if (id === 'midnight') return 'midnight-light';
+    return id; // light-first bases use themselves as the light variant
+  }
+  function darkPreset(id) {
+    if (id === 'midnight') return 'midnight'; // root preset is midnight's dark
+    return id + '-dark';
+  }
+  pairs.forEach(function (t) {
+    var light = presetColors(lightPreset(t.id));
+    var dark = presetColors(darkPreset(t.id));
+    var btn = document.createElement('button');
+    btn.type = 'button';
+    btn.className = 'theme-card';
+    btn.setAttribute('aria-pressed', 'false');
+    btn.setAttribute('data-pair', t.id);
+    // #139: build the swatches via DOM APIs (CSSOM styles) instead of
+    // innerHTML strings: re-parsing serialized inline styles would trip
+    // style-src 'self'.
+    var label = document.createElement('strong');
+    label.textContent = t.name;
+    btn.appendChild(label);
+    [light, dark].forEach(function (colors) {
+      var row = document.createElement('span');
+      row.className = 'swatches';
+      colors.forEach(function (c) {
+        var sw = document.createElement('span');
+        sw.className = 'swatch';
+        sw.style.backgroundColor = c;
+        row.appendChild(sw);
+      });
+      btn.appendChild(row);
+    });
+    btn.addEventListener('click', function () {
+      var dark = state().dark;
+      document.documentElement.dataset.preset = dark ? t.id + '-dark' : t.id;
+      try { localStorage.setItem('palette-theme', t.id); } catch (e) {}
+      Object.keys(cards).forEach(function (k) { cards[k].setAttribute('aria-pressed', 'false'); });
+      btn.setAttribute('aria-pressed', 'true');
+    });
+    cards[t.id] = btn;
+    grid.appendChild(btn);
+  });
+
+  function sync() {
+    var s = state();
+    Object.keys(cards).forEach(function (k) {
+      cards[k].setAttribute('aria-pressed', k === s.base ? 'true' : 'false');
+    });
+    var dt = document.getElementById('settings-dark-toggle');
+    if (dt) dt.setAttribute('aria-pressed', s.dark ? 'true' : 'false');
+  }
+  sync();
+  // the topbar script runs before this button exists, so wire it here
+  var dt = document.getElementById('settings-dark-toggle');
+  dt.addEventListener('click', function () {
+    var btns = document.querySelectorAll('.topbar .dark-toggle');
+    if (btns.length) btns[0].click(); else document.dispatchEvent(new CustomEvent('palette-darkchange'));
+  });
+  document.addEventListener('palette-darkchange', sync);
+})();
diff --git a/internal/web/static/table.js b/internal/web/static/table.js
index 2eb77ba..ed8c8f6 100644
--- a/internal/web/static/table.js
+++ b/internal/web/static/table.js
@@ -79,10 +79,10 @@ const PaletteTable = (() => {
         const rows = $('rows'), empty = $('empty');
         if (!items.length) {
           rows.innerHTML = '';
-          empty.style.display = 'block';
+          empty.classList.remove('hidden');
           empty.textContent = filtered ? opts.emptyFiltered : opts.emptyAll;
         } else {
-          empty.style.display = 'none';
+          empty.classList.add('hidden');
           rows.innerHTML = items.map(opts.rowHtml).join('');
         }
 
@@ -97,7 +97,7 @@ const PaletteTable = (() => {
             const view = items.slice(fOff, fOff + opts.perPage);
             rows.innerHTML = view.length ? view.map(opts.rowHtml).join('') : '';
             if (!view.length) {
-              empty.style.display = 'block';
+              empty.classList.remove('hidden');
               empty.textContent = filtered ? opts.emptyFiltered : opts.emptyAll;
             }
             showing.textContent = `Showing ${view.length === 0 ? 0 : fOff+1}–${fOff+view.length} of ${items.length.toLocaleString()} ${filtered ? 'matches' : 'sorted'} · page ${state.page} of ${filtPages}`;
diff --git a/internal/web/static/theme.js b/internal/web/static/theme.js
new file mode 100644
index 0000000..469115b
--- /dev/null
+++ b/internal/web/static/theme.js
@@ -0,0 +1,78 @@
+// #16/#100/#127: theme preset resolution. Runs in <head> (blocking) so the
+// correct data-preset is set before first paint. The server default dark flag
+// arrives via the script tag's data-default-dark attribute so no inline script is needed.
+// #130: shared line wrap preference (localStorage 'palette-wrap', default off).
+// preset hook (#16): ?theme= wins; else persisted choice (#100).
+// #127: theme pairs - each base theme has a light and dark variant;
+// palette-theme stores the base id, palette-dark the dark flag.
+(function () {
+  var PAIRS = {
+    'midnight':        { light: 'midnight-light',       dark: 'midnight' },
+    'smooth':          { light: 'smooth',               dark: 'smooth-dark' },
+    'pastel-lavender': { light: 'pastel-lavender',      dark: 'pastel-lavender-dark' },
+    'pastel-peach':    { light: 'pastel-peach',         dark: 'pastel-peach-dark' },
+    'pastel-cloud':    { light: 'pastel-cloud',         dark: 'pastel-cloud-dark' }
+  };
+  function resolve(t, dark) {
+    for (var base in PAIRS) {
+      if (t === PAIRS[base].light || t === PAIRS[base].dark) return t;
+      if (t === base) return dark ? PAIRS[base].dark : PAIRS[base].light;
+    }
+    return null;
+  }
+  var t = new URLSearchParams(location.search).get('theme');
+  // precedence: URL ?theme= > stored pair+dark prefs > server default dark > dark on
+  var dark = (document.currentScript && document.currentScript.getAttribute('data-default-dark')) === '1';
+  try {
+    var stored = localStorage.getItem('palette-dark');
+    if (stored !== null) dark = stored !== 'false';
+  } catch (e) {}
+  if (t) {
+    // URL ?theme= wins and accepts both base and variant ids; a variant id
+    // also sets the dark flag and normalizes t back to its base pair id.
+    var found = false;
+    for (var base in PAIRS) {
+      if (t === PAIRS[base].dark) { dark = true; t = base; found = true; break; }
+      if (t === PAIRS[base].light) { dark = false; t = base; found = true; break; }
+      if (t === base) { found = true; break; }
+    }
+    if (!found) t = null;
+  }
+  if (!t) {
+    try { t = localStorage.getItem('palette-theme'); } catch (e) {}
+  }
+  if (!PAIRS[t]) t = 'midnight';
+  // do not persist anything here: URL theme is a one-off override
+  document.documentElement.dataset.preset = dark ? PAIRS[t].dark : PAIRS[t].light;
+})();
+// #130: shared line wrap preference (localStorage 'palette-wrap', default off)
+(function () {
+  function wrapOn() {
+    try { return localStorage.getItem('palette-wrap') === '1'; } catch (e) { return false; }
+  }
+  function wrapApply(on) {
+    if (on) document.documentElement.setAttribute('data-wrap', '1');
+    else document.documentElement.removeAttribute('data-wrap');
+    document.querySelectorAll('.wrap-toggle').forEach(function (b) {
+      b.setAttribute('aria-pressed', on ? 'true' : 'false');
+    });
+    var s = document.getElementById('wrap-setting');
+    if (s) s.checked = on;
+  }
+  window.paletteWrapToggle = function () {
+    var on = !wrapOn();
+    try { localStorage.setItem('palette-wrap', on ? '1' : '0'); } catch (e) {}
+    wrapApply(on);
+    return on;
+  };
+  document.addEventListener('DOMContentLoaded', function () {
+    wrapApply(wrapOn());
+    document.querySelectorAll('.wrap-toggle').forEach(function (b) {
+      b.addEventListener('click', function () { window.paletteWrapToggle(); });
+    });
+    var s = document.getElementById('wrap-setting');
+    if (s) s.addEventListener('change', function () {
+      if (s.checked !== wrapOn()) window.paletteWrapToggle();
+    });
+  });
+})();
diff --git a/internal/web/static/topbar.js b/internal/web/static/topbar.js
new file mode 100644
index 0000000..8a6989f
--- /dev/null
+++ b/internal/web/static/topbar.js
@@ -0,0 +1,44 @@
+// #127: dark mode toggle: flips to the other variant of the active pair.
+// #127: dark mode toggle - flips to the other variant of the active pair.
+  (function () {
+    var PAIRS = {
+      'midnight':        { light: 'midnight-light',       dark: 'midnight' },
+      'smooth':          { light: 'smooth',               dark: 'smooth-dark' },
+      'pastel-lavender': { light: 'pastel-lavender',      dark: 'pastel-lavender-dark' },
+      'pastel-peach':    { light: 'pastel-peach',         dark: 'pastel-peach-dark' },
+      'pastel-cloud':    { light: 'pastel-cloud',         dark: 'pastel-cloud-dark' }
+    };
+    var root = document.documentElement;
+    function state() {
+      var p = root.dataset.preset || 'midnight';
+      for (var base in PAIRS) {
+        if (p === PAIRS[base].dark) return { base: base, dark: true };
+        if (p === PAIRS[base].light) return { base: base, dark: false };
+      }
+      return { base: 'midnight', dark: true };
+    }
+    function apply() {
+      var s = state();
+      document.body.classList.toggle('dark', s.dark);
+      root.classList.toggle('dark', s.dark);
+    }
+    function sync(btns) {
+      btns.forEach(function (b) {
+        b.setAttribute('aria-pressed', state().dark ? 'true' : 'false');
+      });
+    }
+    var btns = document.querySelectorAll('.dark-toggle');
+    apply();
+    sync(Array.prototype.slice.call(btns));
+    btns.forEach(function (b) {
+      b.addEventListener('click', function () {
+        var s = state();
+        var dark = !s.dark;
+        root.dataset.preset = dark ? PAIRS[s.base].dark : PAIRS[s.base].light;
+        try { localStorage.setItem('palette-dark', dark ? 'true' : 'false'); } catch (e) {}
+        apply();
+        sync(Array.prototype.slice.call(btns));
+        document.dispatchEvent(new CustomEvent('palette-darkchange'));
+      });
+    });
+  })();
diff --git a/internal/web/static/unlock.js b/internal/web/static/unlock.js
new file mode 100644
index 0000000..4b9d777
--- /dev/null
+++ b/internal/web/static/unlock.js
@@ -0,0 +1,7 @@
+// #139: unlock page: password reveal toggle.
+document.getElementById('pwreveal').addEventListener('click', () => {
+  const pw = document.getElementById('password');
+  const show = pw.type === 'password';
+  pw.type = show ? 'text' : 'password';
+  document.getElementById('pwreveal').title = show ? 'Hide password' : 'Show password';
+});
diff --git a/internal/web/templates/admin.html b/internal/web/templates/admin.html
index 4a04798..2b64f04 100644
--- a/internal/web/templates/admin.html
+++ b/internal/web/templates/admin.html
@@ -12,7 +12,7 @@
         <span id="admin-key-status"></span>
       </form>
 
-      <div id="admin-panel" style="display:none">
+      <div id="admin-panel" class="hidden">
         <h2>Settings</h2>
         <form id="admin-settings-form">
           <table>
@@ -30,79 +30,5 @@
     </div>
   </div>
 </div>
-<script>
-(function () {
-  var KEY = 'palette_admin_key';
-  var keyInput = document.getElementById('admin-key');
-  var status = document.getElementById('admin-key-status');
-  var panel = document.getElementById('admin-panel');
-
-  function key() { return sessionStorage.getItem(KEY) || ''; }
-
-  function api(path, opts) {
-    opts = opts || {};
-    // allow callers to override the key header (e.g. validating a typed key, #99)
-    opts.headers = Object.assign({ 'X-Admin-Key': key() }, opts.headers || {});
-    if (opts.body) opts.headers['Content-Type'] = 'application/json';
-    return fetch(path, opts);
-  }
-
-  function loadSettings() {
-    api('/admin/api/settings').then(function (r) {
-      if (r.status !== 200) { showLock(); return; }
-      return r.json();
-    }).then(function (s) {
-      if (!s) return;
-      document.getElementById('rl-burst').value = s.rate_limit_burst;
-      document.getElementById('rl-refill').value = s.rate_limit_per_minute;
-      document.getElementById('max-content').value = s.max_content_bytes;
-      document.getElementById('default-expiry').value = s.default_expiry;
-      document.getElementById('slug-days').value = s.custom_slug_reservation_days;
-      document.getElementById('burn-window').value = s.burn_viewer_window_minutes;
-      panel.style.display = '';
-    });
-  }
-
-  function showLock() {
-    panel.style.display = 'none';
-    sessionStorage.removeItem(KEY);
-  }
-
-  document.getElementById('admin-key-form').addEventListener('submit', function (e) {
-    e.preventDefault();
-    // #99: don't persist the key until the server accepts it
-    api('/admin/api/settings', { headers: { 'X-Admin-Key': keyInput.value } }).then(function (r) {
-      if (r.status === 200) {
-        sessionStorage.setItem(KEY, keyInput.value);
-        status.textContent = '✓';
-        keyInput.value = '';
-        loadSettings();
-      } else {
-        status.textContent = 'invalid key';
-        showLock();
-      }
-    });
-  });
-
-  document.getElementById('admin-settings-form').addEventListener('submit', function (e) {
-    e.preventDefault();
-    var body = {
-      rate_limit_burst: parseFloat(document.getElementById('rl-burst').value),
-      rate_limit_per_minute: parseFloat(document.getElementById('rl-refill').value),
-      max_content_bytes: parseInt(document.getElementById('max-content').value, 10),
-      default_expiry: document.getElementById('default-expiry').value,
-      custom_slug_reservation_days: parseInt(document.getElementById('slug-days').value, 10),
-      burn_viewer_window_minutes: parseInt(document.getElementById('burn-window').value, 10)
-    };
-    api('/admin/api/settings', { method: 'POST', body: JSON.stringify(body) }).then(function (r) {
-      document.getElementById('admin-save-status').textContent = r.status === 200 ? 'saved' : 'error';
-      if (r.status !== 200) showLock();
-    });
-  });
-
-  // #112: always show the lock on fresh load — do not auto-restore the
-  // panel from a stale sessionStorage key. The key is only written after a
-  // successful unlock (above) so in-page actions still work within this visit.
-})();
-</script>
+<script src="/static/admin.js" defer></script>
 {{template "foot" .}}
diff --git a/internal/web/templates/can.html b/internal/web/templates/can.html
index 2c21ae4..99ec9f3 100644
--- a/internal/web/templates/can.html
+++ b/internal/web/templates/can.html
@@ -1,7 +1,7 @@
 {{template "head" .}}
 {{template "topbar" .}}
 <div class="center">
-  <div class="float can-page" style="max-width:900px; width:100%;">
+  <div class="float can-page">
     <div class="inner">
       <h1>{{.Title}} <span class="badge" title="This is a can — a bundle of pastes">can</span></h1>
       {{if .HasDescription}}<p class="sub">{{.Description}}</p>{{end}}
diff --git a/internal/web/templates/foot.html b/internal/web/templates/foot.html
index 850e1fc..522a337 100644
--- a/internal/web/templates/foot.html
+++ b/internal/web/templates/foot.html
@@ -1,21 +1 @@
-{{define "foot"}}<script>
-// live relative-time counters (#46): tick any [data-ts] (epoch seconds) every second
-(function () {
-  function fmt(ts) {
-    const s = Math.max(0, Math.floor(Date.now() / 1000) - ts);
-    if (s < 60) return s + 's ago';
-    if (s < 3600) return Math.floor(s / 60) + 'm ago';
-    if (s < 86400) return Math.floor(s / 3600) + 'h ago';
-    return Math.floor(s / 86400) + 'd ago';
-  }
-  function tick() {
-    document.querySelectorAll('[data-ts]').forEach(el => {
-      const ts = parseInt(el.dataset.ts, 10);
-      if (!isNaN(ts)) el.textContent = fmt(ts);
-    });
-  }
-  setInterval(tick, 1000);
-  document.addEventListener('DOMContentLoaded', tick);
-  tick();
-})();
-</script>{{end}}
\ No newline at end of file
+{{define "foot"}}<script src="/static/foot.js" defer></script>{{end}}
\ No newline at end of file
diff --git a/internal/web/templates/history.html b/internal/web/templates/history.html
index fcb667f..cb6da95 100644
--- a/internal/web/templates/history.html
+++ b/internal/web/templates/history.html
@@ -8,7 +8,7 @@
   <div class="search"><input id="filter" placeholder="Search…"><span class="search-spinner" id="search-spinner"></span></div>
   <div class="float">
     <table>
-      <colgroup><col style="width:260px"><col style="width:140px"><col style="width:120px"><col style="width:96px"><col style="width:140px"><col style="width:190px"><col style="width:100px"></colgroup>
+      <colgroup><col class="col-a"><col class="col-b"><col class="col-c"><col class="col-d"><col class="col-e"><col class="col-f"><col class="col-g"></colgroup>
       <thead><tr>
         <th data-sort="title" class="sortable"><span class="sort-ind"></span>Paste</th>
         <th data-sort="language" class="sortable"><span class="sort-ind"></span>Language</th>
@@ -20,7 +20,7 @@
       </tr></thead>
       <tbody id="rows"></tbody>
     </table>
-    <div class="empty" id="empty" style="display:none">No pastes yet. Create the first one.</div>
+    <div class="empty hidden" id="empty">No pastes yet. Create the first one.</div>
   </div>
   <div class="pager float">
     <span id="showing"></span>
@@ -28,25 +28,5 @@
   </div>
 </div>
 <script src="/static/table.js"></script>
-<script>
-const t = PaletteTable.init({
-  endpoint: '/api/public',
-  perPage: 25,
-  hasPager: true,
-  rowHtml: it =>
-    `<tr class="row" data-href="/${t.esc(it.id)}"><td>` +
-    (it.title
-      ? `${t.esc(it.title)}${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`
-      : `<a class="slug paste-name" href="/${t.esc(it.id)}">${t.esc(it.id)}</a>${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`) +
-    `</td>` +
-    `<td><span class="badge">${t.esc(it.language || 'text')}</span></td>` +
-    `<td class="dim">${t.fmtSize(it.size)}</td><td class="dim">${it.view_count}</td><td class="dim" data-ts="${it.created_at}">${t.ago(it.created_at)}</td>` +
-    (it.custom_slug ? `<td><a class="slug url-link" href="/${t.esc(it.custom_slug)}">/${t.esc(it.custom_slug)}</a></td>` : `<td class="dim">none</td>`) +
-    `<td class="dim"><a class="id-link" href="/${t.esc(it.id)}">${t.esc(it.id)}</a></td></tr>`,
-  emptyFiltered: 'No pastes match your search.',
-  emptyAll: 'No pastes yet. Create the first one.',
-});
-t.load();
-setInterval(t.load, 30000); // auto-refresh history every 30s
-</script>
+<script src="/static/history.js" defer></script>
 {{template "foot" .}}
diff --git a/internal/web/templates/layout.html b/internal/web/templates/layout.html
index ae1162b..ca8cbfc 100644
--- a/internal/web/templates/layout.html
+++ b/internal/web/templates/layout.html
@@ -2,82 +2,7 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <link rel="stylesheet" href="/static/app.css">
-<script>
-// preset hook (#16): ?theme= wins; else persisted choice (#100).
-// #127: theme pairs - each base theme has a light and dark variant;
-// palette-theme stores the base id, palette-dark the dark flag.
-(function () {
-  var PAIRS = {
-    'midnight':        { light: 'midnight-light',       dark: 'midnight' },
-    'smooth':          { light: 'smooth',               dark: 'smooth-dark' },
-    'pastel-lavender': { light: 'pastel-lavender',      dark: 'pastel-lavender-dark' },
-    'pastel-peach':    { light: 'pastel-peach',         dark: 'pastel-peach-dark' },
-    'pastel-cloud':    { light: 'pastel-cloud',         dark: 'pastel-cloud-dark' }
-  };
-  function resolve(t, dark) {
-    for (var base in PAIRS) {
-      if (t === PAIRS[base].light || t === PAIRS[base].dark) return t;
-      if (t === base) return dark ? PAIRS[base].dark : PAIRS[base].light;
-    }
-    return null;
-  }
-  var t = new URLSearchParams(location.search).get('theme');
-  // precedence: URL ?theme= > stored pair+dark prefs > server default dark > dark on
-  var dark = {{ defaultDark }};
-  try {
-    var stored = localStorage.getItem('palette-dark');
-    if (stored !== null) dark = stored !== 'false';
-  } catch (e) {}
-  if (t) {
-    // URL ?theme= wins and accepts both base and variant ids; a variant id
-    // also sets the dark flag and normalizes t back to its base pair id.
-    var found = false;
-    for (var base in PAIRS) {
-      if (t === PAIRS[base].dark) { dark = true; t = base; found = true; break; }
-      if (t === PAIRS[base].light) { dark = false; t = base; found = true; break; }
-      if (t === base) { found = true; break; }
-    }
-    if (!found) t = null;
-  }
-  if (!t) {
-    try { t = localStorage.getItem('palette-theme'); } catch (e) {}
-  }
-  if (!PAIRS[t]) t = 'midnight';
-  // do not persist anything here: URL theme is a one-off override
-  document.documentElement.dataset.preset = dark ? PAIRS[t].dark : PAIRS[t].light;
-})();
-// #130: shared line wrap preference (localStorage 'palette-wrap', default off)
-(function () {
-  function wrapOn() {
-    try { return localStorage.getItem('palette-wrap') === '1'; } catch (e) { return false; }
-  }
-  function wrapApply(on) {
-    if (on) document.documentElement.setAttribute('data-wrap', '1');
-    else document.documentElement.removeAttribute('data-wrap');
-    document.querySelectorAll('.wrap-toggle').forEach(function (b) {
-      b.setAttribute('aria-pressed', on ? 'true' : 'false');
-    });
-    var s = document.getElementById('wrap-setting');
-    if (s) s.checked = on;
-  }
-  window.paletteWrapToggle = function () {
-    var on = !wrapOn();
-    try { localStorage.setItem('palette-wrap', on ? '1' : '0'); } catch (e) {}
-    wrapApply(on);
-    return on;
-  };
-  document.addEventListener('DOMContentLoaded', function () {
-    wrapApply(wrapOn());
-    document.querySelectorAll('.wrap-toggle').forEach(function (b) {
-      b.addEventListener('click', function () { window.paletteWrapToggle(); });
-    });
-    var s = document.getElementById('wrap-setting');
-    if (s) s.addEventListener('change', function () {
-      if (s.checked !== wrapOn()) window.paletteWrapToggle();
-    });
-  });
-})();
-</script>
+<script src="/static/theme.js" data-default-dark="{{ if defaultDark }}1{{ else }}0{{ end }}"></script>
 {{end}}
 
 {{define "topbar"}}
@@ -98,49 +23,5 @@
       <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="12" cy="12" r="3"/><path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1 0 2.83 2 2 0 0 1-2.83 0l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-2 2 2 2 0 0 1-2-2v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83 0 2 2 0 0 1 0-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1-2-2 2 2 0 0 1 2-2h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 0-2.83 2 2 0 0 1 2.83 0l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 2-2 2 2 0 0 1 2 2v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 0 2 2 0 0 1 0 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 2 2 2 2 0 0 1-2 2h-.09a1.65 1.65 0 0 0-1.51 1z"/></svg>
     </a>
   </div>
-  <script>
-  // #127: dark mode toggle - flips to the other variant of the active pair.
-  (function () {
-    var PAIRS = {
-      'midnight':        { light: 'midnight-light',       dark: 'midnight' },
-      'smooth':          { light: 'smooth',               dark: 'smooth-dark' },
-      'pastel-lavender': { light: 'pastel-lavender',      dark: 'pastel-lavender-dark' },
-      'pastel-peach':    { light: 'pastel-peach',         dark: 'pastel-peach-dark' },
-      'pastel-cloud':    { light: 'pastel-cloud',         dark: 'pastel-cloud-dark' }
-    };
-    var root = document.documentElement;
-    function state() {
-      var p = root.dataset.preset || 'midnight';
-      for (var base in PAIRS) {
-        if (p === PAIRS[base].dark) return { base: base, dark: true };
-        if (p === PAIRS[base].light) return { base: base, dark: false };
-      }
-      return { base: 'midnight', dark: true };
-    }
-    function apply() {
-      var s = state();
-      document.body.classList.toggle('dark', s.dark);
-      root.classList.toggle('dark', s.dark);
-    }
-    function sync(btns) {
-      btns.forEach(function (b) {
-        b.setAttribute('aria-pressed', state().dark ? 'true' : 'false');
-      });
-    }
-    var btns = document.querySelectorAll('.dark-toggle');
-    apply();
-    sync(Array.prototype.slice.call(btns));
-    btns.forEach(function (b) {
-      b.addEventListener('click', function () {
-        var s = state();
-        var dark = !s.dark;
-        root.dataset.preset = dark ? PAIRS[s.base].dark : PAIRS[s.base].light;
-        try { localStorage.setItem('palette-dark', dark ? 'true' : 'false'); } catch (e) {}
-        apply();
-        sync(Array.prototype.slice.call(btns));
-        document.dispatchEvent(new CustomEvent('palette-darkchange'));
-      });
-    });
-  })();
-  </script>
+  <script src="/static/topbar.js" defer></script>
 {{end}}
diff --git a/internal/web/templates/mine.html b/internal/web/templates/mine.html
index 2d7ec02..31bfdc4 100644
--- a/internal/web/templates/mine.html
+++ b/internal/web/templates/mine.html
@@ -8,7 +8,7 @@
   <div class="search"><input id="filter" placeholder="Search…"><span class="search-spinner" id="search-spinner"></span></div>
   <div class="float">
     <table>
-      <colgroup><col style="width:260px"><col style="width:140px"><col style="width:120px"><col style="width:150px"><col style="width:190px"><col style="width:100px"></colgroup>
+      <colgroup><col class="col-a"><col class="col-b"><col class="col-c"><col class="col-d2"><col class="col-e"><col class="col-f"></colgroup>
       <thead><tr>
         <th data-sort="title" class="sortable"><span class="sort-ind"></span>Paste</th>
         <th data-sort="language" class="sortable"><span class="sort-ind"></span>Language</th>
@@ -19,7 +19,7 @@
       </tr></thead>
       <tbody id="rows"></tbody>
     </table>
-    <div class="empty" id="empty" style="display:none">No pastes from this browser yet.</div>
+    <div class="empty hidden" id="empty">No pastes from this browser yet.</div>
   </div>
   <div class="pager float">
     <span id="showing"></span>
@@ -27,51 +27,5 @@
   </div>
 </div>
 <script src="/static/table.js"></script>
-<script>
-function toast(msg, kind) {
-  let t = document.querySelector('.toast');
-  if (!t) { t = document.createElement('div'); t.className = 'toast'; document.body.appendChild(t); }
-  t.textContent = msg;
-  t.classList.remove('success', 'error');
-  if (kind === 'success') t.classList.add('success');
-  if (kind === 'error') t.classList.add('error');
-  t.classList.add('show');
-  clearTimeout(t._h);
-  t._h = setTimeout(() => t.classList.remove('show'), 2000);
-}
-
-const t = PaletteTable.init({
-  endpoint: '/api/mine',
-  perPage: 25,
-  hasPager: true,
-  rowHtml: it =>
-    `<tr class="row" data-href="/${t.esc(it.id)}"><td>` +
-    (it.title
-      ? `${t.esc(it.title)}${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`
-      : `<a class="slug paste-name" href="/${t.esc(it.id)}">${t.esc(it.id)}</a>${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`) +
-    `</td>` +
-    `<td><span class="badge">${t.esc(it.language || 'text')}</span></td>` +
-    `<td class="dim">${t.fmtSize(it.size)}</td><td class="dim" data-ts="${it.created_at}">${t.ago(it.created_at)}</td>` +
-    (it.custom_slug ? `<td><a class="slug url-link" href="/${t.esc(it.custom_slug)}">/${t.esc(it.custom_slug)}</a></td>` : `<td class="dim">none</td>`) +
-    `<td class="dim"><a class="id-link" href="/${t.esc(it.id)}">${t.esc(it.id)}</a></td>` +
-    `<td><button class="btn btn-icon del" data-id="${t.esc(it.id)}" title="Delete paste" aria-label="Delete paste">&times;</button></td></tr>`,
-  emptyFiltered: 'No pastes from this browser match your search.',
-  emptyAll: 'No pastes from this browser yet.',
-});
-
-// delete buttons (viewer-scoped, enforced server-side #37)
-document.getElementById('rows').addEventListener('click', async e => {
-  const del = e.target.closest('button.del');
-  if (!del) return;
-  e.stopPropagation();
-  del.disabled = true;
-  try {
-    const res = await fetch('/api/pastes/' + del.dataset.id, { method: 'DELETE' });
-    if (res.ok) { toast('Deleted', 'success'); t.load(); }
-    else { toast('Delete failed', 'error'); del.disabled = false; }
-  } catch (err) { toast('Delete failed', 'error'); del.disabled = false; }
-});
-
-t.load();
-</script>
+<script src="/static/mine.js" defer></script>
 {{template "foot" .}}
diff --git a/internal/web/templates/new.html b/internal/web/templates/new.html
index b51e191..c2a7b4c 100644
--- a/internal/web/templates/new.html
+++ b/internal/web/templates/new.html
@@ -30,7 +30,7 @@
     <div class="created-banner" id="created"></div>
     <div class="actionbar">
       <span class="hint">Ctrl+Enter to create</span>
-      <div class="spacer" style="flex:1"></div>
+      <div class="spacer spacer-flex"></div>
       <button class="btn" id="create">Create</button>
     </div>
   </div>
@@ -46,8 +46,8 @@
         <label><input type="radio" name="exp" value="720h"> 30 days</label>
         <label><input type="radio" name="exp" value="custom"> Custom</label>
       </div>
-      <div class="pw-row" id="customexp-row" style="display:none">
-        <input type="number" id="expnum" min="1" style="width:80px" placeholder="90"> 
+      <div class="pw-row hidden" id="customexp-row">
+        <input type="number" id="expnum" min="1" class="input-num" placeholder="90"> 
         <select id="expunit">
           <option value="m">minutes</option>
           <option value="h" selected>hours</option>
@@ -55,16 +55,16 @@
           <option value="w">weeks</option>
           <option value="mo">months</option>
         </select>
-        <div class="hint" id="customexp-err" style="display:none; color:var(--danger, #c0392b); margin-top:6px;"></div>
+        <div class="hint danger-hint hidden" id="customexp-err"></div>
       </div>
     </div>
     <div class="float side-section">
       <h3>Protection</h3>
       <div class="protect">
         <label class="toggle"><input type="checkbox" id="haspw"> Password lock</label>
-        <div class="pw-row" id="pwrow" style="display:none"><div class="pw-field"><input type="password" id="password" placeholder="Password" autocomplete="new-password"><button type="button" class="reveal" id="pwreveal" title="Show password" tabindex="-1"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M1 12s4-7 11-7 11 7 11 7-4 7-11 7-11-7-11-7z"/><circle cx="12" cy="12" r="3"/><line class="eye-slash" x1="4" y1="4" x2="20" y2="20"/></svg></button></div></div>
+        <div class="pw-row hidden" id="pwrow"><div class="pw-field"><input type="password" id="password" placeholder="Password" autocomplete="new-password"><button type="button" class="reveal" id="pwreveal" title="Show password" tabindex="-1"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M1 12s4-7 11-7 11 7 11 7-4 7-11 7-11-7-11-7z"/><circle cx="12" cy="12" r="3"/><line class="eye-slash" x1="4" y1="4" x2="20" y2="20"/></svg></button></div></div>
         <label class="toggle"><input type="checkbox" id="burn"> Burn after read</label>
-        <div class="pw-row" id="burnrow" style="display:none"><label class="hint" style="font-size:19px;">Readable <input type="number" id="burnreads" min="1" value="1" style="width:64px"> times</label></div>
+        <div class="pw-row hidden" id="burnrow"><label class="hint hint-lg">Readable <input type="number" id="burnreads" min="1" value="1" class="input-num-sm"> times</label></div>
         <label class="toggle"><input type="checkbox" id="unlisted"> Unlisted</label>
       </div>
     </div>
@@ -75,414 +75,17 @@
       </div>
       <input type="file" id="file-input" class="file-input" aria-label="Choose a file">
       <div id="file-chip-slot"></div>
-      <div class="hint" style="margin-top:6px; font-size:19px; display:none" id="file-text-note">File pastes ignore the text editor (one file per paste)</div>
+      <div class="hint hint-lg hidden mt6" id="file-text-note">File pastes ignore the text editor (one file per paste)</div>
     </div>
     <div class="float side-section">
       <h3>Custom URL</h3>
       <input type="text" id="custom" class="custom-input" placeholder="my-snippet">
     </div>
-    <div class="float side-section" id="result-card" style="display:none">
+    <div class="float side-section hidden" id="result-card">
       <h3>Result</h3>
-      <div class="hint" id="result" style="word-break:normal;overflow-wrap:break-word">empty</div>
+      <div class="hint wrap-normal" id="result">empty</div>
     </div>
   </div>
 </div>
-<script>
-const $ = id => document.getElementById(id);
-const content = $('content'), gutter = $('gutter');
-
-function updateGutter() {
-  const lines = content.value.split('\n').length;
-  let s = '';
-  for (let i = 1; i <= Math.max(lines, 1); i++) s += i + '\n';
-  gutter.textContent = s;
-}
-content.addEventListener('input', updateGutter);
-updateGutter();
-
-function toast(msg, kind) {
-  let t = document.querySelector('.toast');
-  if (!t) { t = document.createElement('div'); t.className = 'toast'; document.body.appendChild(t); }
-  t.textContent = msg;
-  t.classList.remove('success', 'error');
-  if (kind === 'success') t.classList.add('success');
-  if (kind === 'error') t.classList.add('error');
-  t.classList.add('show');
-  clearTimeout(t._h);
-  t._h = setTimeout(() => t.classList.remove('show'), 2000);
-}
-$('haspw').addEventListener('change', e => { $('pwrow').style.display = e.target.checked ? 'block' : 'none'; });
-$('burn').addEventListener('change', e => { $('burnrow').style.display = e.target.checked ? 'block' : 'none'; });
-document.querySelectorAll('input[name="exp"]').forEach(r => r.addEventListener('change', () => {
-  $('customexp-row').style.display = document.querySelector('input[name="exp"]:checked').value === 'custom' ? 'block' : 'none';
-  $('customexp-err').style.display = 'none';
-}));
-
-// compose the expires_in Go-duration string when Custom is checked (#48).
-// Returns the string, or null with an inline error shown.
-function composeCustomExpiry() {
-  const n = parseInt($('expnum').value, 10);
-  const unit = $('expunit').value;
-  let mins = NaN;
-  if (n > 0) {
-    if (unit === 'm') mins = n;
-    else if (unit === 'h') mins = n * 60;
-    else if (unit === 'd') mins = n * 1440;
-    else if (unit === 'w') mins = n * 10080;
-    else if (unit === 'mo') mins = n * 43200; // months counted as 30 days
-  }
-  const err = $('customexp-err');
-  if (!(mins >= 1)) {
-    err.textContent = 'Enter a duration of at least 1 minute.';
-    err.style.display = 'block';
-    return null;
-  }
-  if (mins > 525600) { // more than 1 year
-    err.textContent = 'Custom expiry cannot exceed 1 year.';
-    err.style.display = 'block';
-    return null;
-  }
-  err.style.display = 'none';
-  // compose as h (+d/m remainders); Go parses '336h', '90m', '6h30m' fine
-  const hours = Math.floor(mins / 60), rem = mins % 60;
-  if (rem === 0) return hours + 'h';
-  if (hours === 0) return rem + 'm';
-  return hours + 'h' + rem + 'm';
-}
-
-$('pwreveal').addEventListener('click', () => {
-  const pw = $('password');
-  const show = pw.type === 'password';
-  pw.type = show ? 'text' : 'password';
-  $('pwreveal').classList.toggle('off', !show);
-  $('pwreveal').title = show ? 'Hide password' : 'Show password';
-});
-
-let guessed = ''; // last auto-detected language, '' = user override
-
-// #105: map backend machine-readable error codes to plain-language guidance.
-// Unknown codes fall back to a generic message; the technical detail stays
-// in the API response for API consumers.
-const ERROR_MESSAGES = {
-  slug_taken: 'That Custom URL is already taken. Try another.',
-  slug_reserved: 'That Custom URL is reserved. Try another.',
-  slug_invalid: 'Please keep the Custom URL under 64 characters, using only letters, numbers, dashes, or underscores.',
-  content_empty: 'Write or paste something first.',
-  content_too_large: 'This paste is too large. The limit is 5 MB.',
-  file_too_large: 'File is too large. The limit is 25 MB.',
-  one_file_only: 'Choose either text or a file for now.',
-  expiry_invalid: 'Please pick an expiry between 1 minute and 1 year.',
-  rate_limited: 'Too many tries. Wait a minute and try again.',
-};
-const GENERIC_ERROR = 'Something went wrong. Please try again.';
-
-function friendlyError(data) {
-  return ERROR_MESSAGES[data && data.code] || GENERIC_ERROR;
-}
-
-// #105: color the result box by outcome — success (ok), error (err),
-// warning (warn) — with a colored left border (CSS .result-ok/.result-err).
-function setResultKind(kind) {
-  const card = $('result-card');
-  card.classList.remove('result-ok', 'result-err', 'result-warn');
-  if (kind) card.classList.add('result-' + kind);
-}
-
-function showResult(html, kind) {
-  $('result').innerHTML = html;
-  $('result').dataset.token = kind === 'ok' ? ($('result').dataset.token || '') : ($('result').dataset.token || '');
-  $('result-card').style.display = 'block';
-  setResultKind(kind === 'ok' ? 'ok' : (kind === 'warn' ? 'warn' : 'err'));
-}
-function defaultFilename(lang) {
-  const names = {
-    python: 'Python.py', go: 'main.go', javascript: 'script.js', typescript: 'index.ts',
-    rust: 'main.rs', c: 'main.c', cpp: 'main.cpp', java: 'Main.java', bash: 'script.sh',
-    sql: 'query.sql', yaml: 'config.yaml', json: 'data.json', html: 'index.html',
-    css: 'style.css', xml: 'doc.xml', php: 'index.php', ruby: 'main.rb',
-    perl: 'main.pl', lua: 'main.lua', dockerfile: 'Dockerfile', toml: 'config.toml',
-    ini: 'config.ini', diff: 'changes.diff',
-    markdown: 'notes.md', text: 'Text.txt',
-  };
-  return names[lang] || '';
-}
-// fill default filename when title is still blank
-function maybeSetDefaultTitle(lang) {
-  const title = $('title');
-  if (lang && !title.value.trim()) {
-    const fn = defaultFilename(lang);
-    if (fn) title.value = fn;
-  }
-}
-
-async function guessLang() {
-  if (!content.value.trim()) return;
-  try {
-    const res = await fetch('/api/guess-language', {
-      method: 'POST',
-      headers: {'Content-Type': 'application/json'},
-      body: JSON.stringify({content: content.value}),
-    });
-    const data = await res.json();
-    if (res.ok && data.language) {
-      guessed = data.language;
-      $('language').value = data.language;
-      maybeSetDefaultTitle(data.language);
-    }
-  } catch(e) {}
-}
-
-// refresh button: always re-detect, even if user picked something
-$('reguess').addEventListener('click', guessLang);
-
-// auto-guess when pasting into the editor
-content.addEventListener('paste', () => setTimeout(guessLang, 0));
-
-async function create() {
-  // #4: can mode — bundle the editor + extra items into a can via multipart
-  if ($('iscan').checked) return createCan();
-  // #38: file attached -> file paste (1 file = 1 paste; text is ignored)
-  if (attachedFile) return createFilePaste();
-
-  const body = {
-    content: content.value,
-    title: $('title').value || null,
-    language: $('language').value || null,
-    custom_slug: $('custom').value || null,
-    burn_after_read: $('burn').checked,
-  };
-  if ($('burn').checked) body.burn_after_reads = parseInt($('burnreads').value, 10) || 1;
-  if ($('haspw').checked) body.password = $('password').value;
-  const exp = document.querySelector('input[name="exp"]:checked').value;
-  if (exp === 'custom') {
-    const dur = composeCustomExpiry();
-    if (dur === null) { toast('Check the custom expiry', 'error'); return; }
-    body.expires_in = dur;
-  } else if (exp) {
-    body.expires_in = exp;
-  }
-
-  const res = await fetch('/api/pastes', {
-    method: 'POST',
-    headers: {'Content-Type': 'application/json'},
-    body: JSON.stringify(body),
-  });
-  const data = await res.json();
-  if (!res.ok) {
-    showResult(friendlyError(data), 'err');
-    toast('Create failed', 'error');
-    return;
-  }
-  finishCreate(data);
-}
-
-// shared success handling for both create paths (#38): result box, copy
-// button, password auto-unlock, then redirect to the paste.
-function finishCreate(data) {
-  const url = location.origin + '/' + (data.custom_slug || data.id);
-  showResult('<a href="' + url + '">' + url + '</a> <button class="btn btn-icon" id="result-copy" title="Copy URL" type="button">⧉</button>', 'ok');
-  $('result').dataset.token = data.deletion_token || '';
-  const copyBtn = document.getElementById('result-copy');
-  copyBtn.addEventListener('click', () => {
-    try {
-      navigator.clipboard.writeText(url);
-      copyBtn.classList.add('ok');               // in-place success feedback (#53)
-      copyBtn.textContent = 'Success!';
-      setTimeout(() => { copyBtn.classList.remove('ok'); copyBtn.textContent = '⧉'; }, 2000);
-    } catch(e) { toast('Copy failed', 'error'); }
-  });
-  // token carried via sessionStorage, never in the URL (#143)
-  const dest = '/' + data.id + '?created=1';
-  try { sessionStorage.setItem('deletion_token_' + data.id, data.deletion_token || ''); } catch(e) {}
-  // password-protected: unlock now with the password we already have (#26)
-  if ($('haspw').checked && data.id) {
-    const fd = new FormData();
-    fd.append('password', $('password').value);
-    fd.append('next', dest);
-    try {
-      fetch('/' + data.id, {method: 'POST', body: fd}).finally(() => { location.href = dest; });
-      return;
-    } catch(e) {}
-  }
-  // show the paste
-  location.href = dest;
-}
-$('create').addEventListener('click', create);
-
-// #38: file attachment support — 1 file = 1 paste. Three input paths:
-// Ctrl+V paste of a file, upload button (file picker), drag-and-drop.
-const MAX_FILE_BYTES = 25 * 1024 * 1024;
-let attachedFile = null; // the single attached File, or null
-
-function humanSize(n) {
-  if (n >= 1048576) return (n / 1048576).toFixed(1) + ' MB';
-  if (n >= 1024) return (n / 1024).toFixed(1) + ' KB';
-  return n + ' B';
-}
-
-function setAttachedFile(file) {
-  if (!file) return clearAttachedFile();
-  if (file.size > MAX_FILE_BYTES) {
-    toast('File is too large. The limit is 25 MB.', 'error');
-    return;
-  }
-  attachedFile = file;
-  renderFileChip();
-  $('file-text-note').style.display = 'block';
-}
-
-function clearAttachedFile() {
-  attachedFile = null;
-  $('file-input').value = '';
-  renderFileChip();
-  $('file-text-note').style.display = 'none';
-}
-
-function renderFileChip() {
-  const slot = $('file-chip-slot');
-  slot.innerHTML = '';
-  if (!attachedFile) return;
-  const chip = document.createElement('div');
-  chip.className = 'file-chip';
-  chip.innerHTML = '<span class="file-chip-name"></span>' +
-    '<span class="file-chip-size">' + humanSize(attachedFile.size) + '</span>' +
-    '<button type="button" class="file-chip-remove" title="Remove file">&times;</button>';
-  chip.querySelector('.file-chip-name').textContent = attachedFile.name;
-  chip.querySelector('.file-chip-remove').addEventListener('click', clearAttachedFile);
-  slot.appendChild(chip);
-}
-
-// (1) file picker via the dropzone click
-$('dropzone').addEventListener('click', () => $('file-input').click());
-$('file-input').addEventListener('change', () => {
-  if ($('file-input').files.length) setAttachedFile($('file-input').files[0]);
-});
-
-// (2) drag-and-drop onto the dropzone (and the page broadly)
-const dz = $('dropzone');
-['dragenter', 'dragover'].forEach(ev => {
-  document.addEventListener(ev, e => {
-    if (!e.dataTransfer || ![...e.dataTransfer.types].includes('Files')) return;
-    e.preventDefault();
-    dz.classList.add('dragover');
-  });
-});
-['dragleave', 'drop'].forEach(ev => {
-  document.addEventListener(ev, e => {
-    if (ev === 'drop') e.preventDefault();
-    if (e.target === dz || ev === 'drop') dz.classList.remove('dragover');
-  });
-});
-document.addEventListener('drop', e => {
-  if (!e.dataTransfer || !e.dataTransfer.files.length) return;
-  e.preventDefault();
-  setAttachedFile(e.dataTransfer.files[0]);
-});
-
-// (3) Ctrl+V of a file anywhere on the page
-document.addEventListener('paste', e => {
-  const files = e.clipboardData && e.clipboardData.files;
-  if (!files || !files.length) return; // normal text paste into the editor
-  e.preventDefault();
-  setAttachedFile(files[0]);
-});
-
-// file create path: POST multipart. 1 file = 1 paste: when a file is
-// attached the editor text is ignored (server enforces this too).
-async function createFilePaste() {
-  const fd = new FormData();
-  fd.append('file', attachedFile);
-  if ($('title').value) fd.append('title', $('title').value);
-  if ($('custom').value) fd.append('custom_slug', $('custom').value);
-  if ($('haspw').checked) fd.append('password', $('password').value);
-  if ($('burn').checked) {
-    fd.append('burn_after_read', 'true');
-    fd.append('burn_after_reads', String(parseInt($('burnreads').value, 10) || 1));
-  }
-  if ($('unlisted').checked) fd.append('visibility', 'unlisted');
-  const exp = document.querySelector('input[name="exp"]:checked').value;
-  if (exp === 'custom') {
-    const dur = composeCustomExpiry();
-    if (dur === null) { toast('Check the custom expiry', 'error'); return; }
-    fd.append('expires_in', dur);
-  } else if (exp) {
-    fd.append('expires_in', exp);
-  }
-  const res = await fetch('/api/pastes', { method: 'POST', body: fd });
-  const data = await res.json();
-  if (!res.ok) {
-    showResult(friendlyError(data), 'err');
-    toast('Create failed', 'error');
-    return;
-  }
-  finishCreate(data);
-}
-
-// #4: can creation — POST multipart to /api/pastes/can. The main editor is
-// the first item; each extra can-item row is another text item.
-async function createCan() {
-  const items = [];
-  if (content.value.trim()) {
-    items.push({title: $('title').value || 'main', content: content.value, language: $('language').value || ''});
-  }
-  document.querySelectorAll('#can-items .can-item-row').forEach(row => {
-    const t = row.querySelector('.can-item-title').value.trim();
-    const c = row.querySelector('.can-item-content').value;
-    if (c.trim()) items.push({title: t || ('item-' + (items.length + 1)), content: c});
-  });
-  if (!items.length) { toast('Nothing to put in the can', 'error'); return; }
-
-  const fd = new FormData();
-  fd.append('title', $('title').value || 'Untitled can');
-  fd.append('json_items', JSON.stringify(items));
-  if ($('haspw').checked) fd.append('password', $('password').value);
-  if ($('unlisted').checked) fd.append('visibility', 'unlisted');
-  const exp = document.querySelector('input[name="exp"]:checked').value;
-  if (exp === 'custom') {
-    const dur = composeCustomExpiry();
-    if (dur === null) { toast('Check the custom expiry', 'error'); return; }
-    if (dur) fd.append('expires_in', dur);
-  } else if (exp) {
-    fd.append('expires_in', exp);
-  }
-  if ($('custom').value.trim()) fd.append('custom_slug', $('custom').value.trim());
-
-  const res = await fetch('/api/pastes/can', {method: 'POST', body: fd});
-  const data = await res.json();
-  if (!res.ok) {
-    showResult(friendlyError(data), 'err');
-    toast('Can create failed', 'error');
-    return;
-  }
-  const url = location.origin + data.url;
-  showResult('<a href="' + url + '">' + url + '</a> <button class="btn btn-icon" id="result-copy" title="Copy URL" type="button">⧉</button>', 'ok');
-  const copyBtn = document.getElementById('result-copy');
-  copyBtn.addEventListener('click', () => {
-    try {
-      navigator.clipboard.writeText(url);
-      copyBtn.classList.add('ok');
-      copyBtn.textContent = 'Success!';
-      setTimeout(() => { copyBtn.classList.remove('ok'); copyBtn.textContent = '⧉'; }, 2000);
-    } catch(e) { toast('Copy failed', 'error'); }
-  });
-  // password-protected can: unlock now with the password we already have (#26 parity)
-  if ($('haspw').checked && data.id) {
-    const pd = new FormData();
-    pd.append('password', $('password').value);
-    try { await fetch('/can/' + data.id, {method: 'POST', body: pd}); } catch(e) {}
-  }
-  location.href = data.url;
-}
-// reset stale result state when returning via Back (bfcache) (#28)
-window.addEventListener('pageshow', e => {
-  if (!e.persisted) return;
-  const rc = document.getElementById('result-card');
-  if (rc) rc.style.display = 'none';
-  const r = document.getElementById('result');
-  if (r) { r.innerHTML = 'empty'; delete r.dataset.token; }
-});
-document.addEventListener('keydown', e => {
-  if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') { e.preventDefault(); create(); }
-});
-</script>
+<script src="/static/new.js" defer></script>
 {{template "foot" .}}
diff --git a/internal/web/templates/paste.html b/internal/web/templates/paste.html
index ba9bae7..6040efb 100644
--- a/internal/web/templates/paste.html
+++ b/internal/web/templates/paste.html
@@ -8,13 +8,13 @@
       <div class="spacer"></div>
       <button type="button" class="iconbtn wrap-toggle" title="Toggle line wrap" aria-pressed="false">wrap</button>
       <a class="iconbtn" href="/raw/{{.ID}}">raw</a>
-      <a class="iconbtn" href="#" id="copy-btn" onclick="copyContent(this); return false;">copy</a>
-      {{if .DeletionToken}}<a class="iconbtn danger" href="#" onclick="redeem(); return false;">delete</a>{{end}}
+      <a class="iconbtn" href="#" id="copy-btn">copy</a>
+      {{if .DeletionToken}}<a class="iconbtn danger" href="#" id="delete-btn">delete</a>{{end}}
     </div>
   </div>
   <div class="float">
     <div class="stats-pill" id="stats-pill">
-      <button type="button" class="stats-head" id="stats-toggle" aria-expanded="false" onclick="toggleStats()">
+      <button type="button" class="stats-head" id="stats-toggle" aria-expanded="false">
         <svg class="stats-chev" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.4" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><polyline points="6 9 12 15 18 9"/></svg>
         <span class="stats-summary">{{.StatsSummary}}</span>
       </button>
@@ -35,7 +35,7 @@
   </div>
   {{if .JustCreated}}
   <div class="float">
-    <div class="created-banner" style="display:block">
+    <div class="created-banner">
       Paste created. Link copied to clipboard: <a href="/{{.ID}}">{{.Host}}/{{.ID}}</a>
       {{if .DeletionToken}} · deletion token: <code>{{.DeletionToken}}</code>{{end}}
     </div>
@@ -59,43 +59,5 @@
   </div>
 </div>
 <input type="hidden" id="raw-content" value="{{.ContentAttr}}">
-<script>
-function toast(msg) {
-  let t = document.querySelector('.toast');
-  if (!t) { t = document.createElement('div'); t.className = 'toast'; document.body.appendChild(t); }
-  t.textContent = msg;
-  t.classList.add('show');
-  clearTimeout(t._h);
-  t._h = setTimeout(() => t.classList.remove('show'), 2000);
-}
-function toggleStats() {
-  const body = document.getElementById('stats-body');
-  const pill = document.getElementById('stats-pill');
-  const btn = document.getElementById('stats-toggle');
-  const open = body.hidden;
-  body.hidden = !open;
-  pill.classList.toggle('open', open);
-  btn.setAttribute('aria-expanded', open ? 'true' : 'false');
-}
-function copyContent(btn) {
-  navigator.clipboard.writeText(document.getElementById('raw-content').value);
-  // in-place success feedback (#53)
-  if (btn) {
-    btn.classList.add('ok');
-    btn.textContent = 'Success!';
-    clearTimeout(btn._okh);
-    btn._okh = setTimeout(() => { btn.classList.remove('ok'); btn.textContent = 'copy'; }, 2000);
-  } else {
-    toast('Copied', 'success');
-  }
-}
-function redeem() {
-  if (!confirm('Hard delete this paste immediately?')) return;
-  let tok = '';
-  try { tok = sessionStorage.getItem('deletion_token_{{.ID}}') || ''; } catch(e) {}
-  if (!tok) { alert('deletion token not available in this browser'); return; }
-  fetch('/api/pastes/{{.ID}}/redeem', {method: 'DELETE', headers: {'Authorization': 'Bearer ' + tok}})
-    .then(r => { if (r.ok) location.href = '/history'; else alert('delete failed'); });
-}
-</script>
+<script src="/static/paste.js" defer data-paste-id="{{.ID}}"></script>
 {{template "foot" .}}
diff --git a/internal/web/templates/settings.html b/internal/web/templates/settings.html
index 1720424..dff3571 100644
--- a/internal/web/templates/settings.html
+++ b/internal/web/templates/settings.html
@@ -13,102 +13,11 @@
       </button>
       <h3>Theme</h3>
       <div class="theme-grid" id="theme-grid"></div>
-      <h3 style="margin-top:18px">Editor</h3>
-      <label class="toggle" for="wrap-setting" style="display:inline-flex"><input type="checkbox" id="wrap-setting"> Line wrap</label>
+      <h3 class="mt18">Editor</h3>
+      <label class="toggle toggle-inline" for="wrap-setting"><input type="checkbox" id="wrap-setting"> Line wrap</label>
       <p class="admin-link-row"><a class="admin-link" href="/admin">Admin</a></p>
     </div>
   </div>
 </div>
-<script>
-(function () {
-  // #112: derive each preset's swatches from the real CSS variables in
-  // app.css by temporarily applying data-preset, so they can never drift.
-  // #127: 5 theme pairs, light swatches top row, dark bottom row.
-  var pairs = [
-    { id: 'midnight',        name: 'Midnight' },
-    { id: 'smooth',          name: 'Smooth' },
-    { id: 'pastel-lavender', name: 'Pastel Lavender' },
-    { id: 'pastel-peach',    name: 'Pastel Peach' },
-    { id: 'pastel-cloud',    name: 'Pastel Cloud' }
-  ];
-  var SWATCH_VARS = ['--bg', '--surface', '--surface-2', '--muted', '--accent'];
-
-  function presetColors(id) {
-    var root = document.documentElement;
-    var prev = root.getAttribute('data-preset');
-    root.setAttribute('data-preset', id);
-    var cs = getComputedStyle(root);
-    var colors = SWATCH_VARS.map(function (v) { return cs.getPropertyValue(v).trim(); });
-    if (prev === null) root.removeAttribute('data-preset'); else root.setAttribute('data-preset', prev);
-    return colors;
-  }
-
-  // current base pair + dark flag from the resolved data-preset.
-  // "midnight" is itself the dark variant, so check dark ids first.
-  function state() {
-    var p = document.documentElement.dataset.preset || 'midnight';
-    if (p === 'midnight' || /-dark$/.test(p)) {
-      return { base: p === 'midnight' ? 'midnight' : p.replace(/-dark$/, ''), dark: true };
-    }
-    return { base: p === 'midnight-light' ? 'midnight' : p, dark: false };
-  }
-
-  var grid = document.getElementById('theme-grid');
-  var cards = {};
-  // #132: midnight is dark-first (root preset = midnight = dark; its light
-  // variant is midnight-light), the others are light-first. Resolve the
-  // LIGHT and DARK preset ids generically so the light swatches always
-  // render in the top row of every card.
-  function lightPreset(id) {
-    if (id === 'midnight') return 'midnight-light';
-    return id; // light-first bases use themselves as the light variant
-  }
-  function darkPreset(id) {
-    if (id === 'midnight') return 'midnight'; // root preset is midnight's dark
-    return id + '-dark';
-  }
-  pairs.forEach(function (t) {
-    var light = presetColors(lightPreset(t.id));
-    var dark = presetColors(darkPreset(t.id));
-    var btn = document.createElement('button');
-    btn.type = 'button';
-    btn.className = 'theme-card';
-    btn.setAttribute('aria-pressed', 'false');
-    btn.setAttribute('data-pair', t.id);
-    btn.innerHTML = '<strong>' + t.name + '</strong>' +
-      '<span class="swatches">' + light.map(function (c) {
-        return '<span class="swatch" style="background:' + c + '"></span>';
-      }).join('') + '</span>' +
-      '<span class="swatches">' + dark.map(function (c) {
-        return '<span class="swatch" style="background:' + c + '"></span>';
-      }).join('') + '</span>';
-    btn.addEventListener('click', function () {
-      var dark = state().dark;
-      document.documentElement.dataset.preset = dark ? t.id + '-dark' : t.id;
-      try { localStorage.setItem('palette-theme', t.id); } catch (e) {}
-      Object.keys(cards).forEach(function (k) { cards[k].setAttribute('aria-pressed', 'false'); });
-      btn.setAttribute('aria-pressed', 'true');
-    });
-    cards[t.id] = btn;
-    grid.appendChild(btn);
-  });
-
-  function sync() {
-    var s = state();
-    Object.keys(cards).forEach(function (k) {
-      cards[k].setAttribute('aria-pressed', k === s.base ? 'true' : 'false');
-    });
-    var dt = document.getElementById('settings-dark-toggle');
-    if (dt) dt.setAttribute('aria-pressed', s.dark ? 'true' : 'false');
-  }
-  sync();
-  // the topbar script runs before this button exists, so wire it here
-  var dt = document.getElementById('settings-dark-toggle');
-  dt.addEventListener('click', function () {
-    var btns = document.querySelectorAll('.topbar .dark-toggle');
-    if (btns.length) btns[0].click(); else document.dispatchEvent(new CustomEvent('palette-darkchange'));
-  });
-  document.addEventListener('palette-darkchange', sync);
-})();
-</script>
+<script src="/static/settings.js" defer></script>
 {{template "foot" .}}
diff --git a/internal/web/templates/unlock.html b/internal/web/templates/unlock.html
index 24182ce..f869088 100644
--- a/internal/web/templates/unlock.html
+++ b/internal/web/templates/unlock.html
@@ -18,12 +18,5 @@
     <div class="foot">Created <span data-ts="{{.CreatedAtUnix}}">{{.CreatedAgo}}</span></div>
   </div>
 </div>
-<script>
-document.getElementById('pwreveal').addEventListener('click', () => {
-  const pw = document.getElementById('password');
-  const show = pw.type === 'password';
-  pw.type = show ? 'text' : 'password';
-  document.getElementById('pwreveal').title = show ? 'Hide password' : 'Show password';
-});
-</script>
+<script src="/static/unlock.js" defer></script>
 {{template "foot" .}}
diff --git a/internal/web/web.go b/internal/web/web.go
index b3a8166..074d183 100644
--- a/internal/web/web.go
+++ b/internal/web/web.go
@@ -383,8 +383,12 @@ func (u *UI) Handlers() *Handlers { return &Handlers{UI: u} }
 
 // #59: security headers for rendered HTML pages. Applied wherever the
 // response is text/html (page templates and the inline can page); JSON API
-// responses and /raw content pass through untouched. script-src allows
-// 'unsafe-inline' because the page templates carry inline scripts; CSP
+// responses and /raw content pass through untouched.
+// #139: script-src and style-src no longer allow 'unsafe-inline'. All
+// previously-inline scripts moved to external files under static/ (page data
+// reaches them via data-* attributes on the script tags), inline style
+// attributes became CSS classes, and JS sets swatch colors via CSSOM. The
+// img-src data: allowance stays: SVG data-URI backgrounds in app.css need it.
 // default-src 'self' still blocks external content and object/frame embeds,
 // and frame-ancestors 'none' closes the clickjacking gap flagged in the #34
 // pentest. Runs after the handler so the Content-Type is already set.
@@ -396,7 +400,7 @@ func SecurityHeaders(next http.Handler) http.Handler {
 		// is harmless and arguably desirable.
 		h := w.Header()
 		h.Set("Content-Security-Policy",
-			"default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'none'")
+			"default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data:; frame-ancestors 'none'")
 		h.Set("Referrer-Policy", "no-referrer")
 		h.Set("X-Content-Type-Options", "nosniff")
 		next.ServeHTTP(w, r)