diff --git a/web/static/app.css b/web/static/app.css
index 3bf5371..d6f433c 100644
--- a/web/static/app.css
+++ b/web/static/app.css
@@ -95,10 +95,13 @@ body {
   border: 1px solid var(--border); background: var(--surface-2); color: var(--muted-fg);
   border-radius: var(--radius); padding: 4px 10px; font: inherit; font-size: 21.6px; cursor: pointer;
 }
+/* shared code line metrics (#50): gutter + code must share one line box */
+:root { --code-lh: 1.7; --code-fs: 21.6px; }
+
 .editor-wrap { flex: 1; display: flex; min-height: 0; }
 .gutter {
   padding: 14px 10px; text-align: right; color: var(--muted); font-family: var(--font-mono);
-  font-size: 21.6px; line-height: 1.7; user-select: none; white-space: pre; overflow: hidden;
+  font-size: var(--code-fs); line-height: var(--code-lh); user-select: none; white-space: pre; overflow: hidden;
   border-right: 1px solid var(--border);
 }
 .editor {
@@ -145,11 +148,12 @@ body {
 .paste-title-bar { display: flex; align-items: center; gap: 12px; padding: 12px 18px; flex-wrap: wrap; }
 .paste-title-bar h1 { font-size: 29.2px; font-weight: 600; margin: 0; }
 .stats-pill { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
-.stats-head { display: flex; align-items: center; gap: 10px; width: 100%; background: none; border: 0; color: var(--muted-fg); font: inherit; font-size: 21.6px; padding: 10px 14px; cursor: pointer; text-align: left; }
+.stats-head { display: flex; align-items: center; gap: 16px; width: 100%; background: none; border: 0; color: var(--muted-fg); font: inherit; font-size: 21.6px; padding: 14px 18px; cursor: pointer; text-align: left; }
 .stats-head:hover { color: var(--fg); background: var(--surface-2); }
 .stats-chev { width: 18px; height: 18px; flex: none; transition: transform 0.15s ease; }
 .stats-pill.open .stats-chev { transform: rotate(180deg); }
-.stats-summary { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.stats-summary { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; letter-spacing: .01em; }
+@media (max-width: 640px) { .stats-summary { white-space: normal; word-break: break-word; } }
 .stats-body { border-top: 1px solid var(--border); }
 .stats-grid { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; padding: 12px 16px; font-size: 20.7px; }
 .stats-k { color: var(--muted-fg); }
@@ -169,10 +173,12 @@ body {
 }
 .code-head .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
 .code {
-  font-family: var(--font-mono); font-size: 22.4px; line-height: 1.7;
+  font-family: var(--font-mono); font-size: var(--code-fs); line-height: var(--code-lh);
   padding: 14px 0; display: flex; overflow-x: auto;
 }
 .code .gutter { flex-shrink: 0; }
+/* gutter/code share line metrics; the editor gutter keeps its own padding (#50) */
+.code .gutter { padding-top: 0; padding-bottom: 0; }
 .codebody { padding: 0 18px; white-space: pre; }
 /* syntax highlight tokens (#1) */
 .tok-kw { color: #c792ea; }
@@ -370,6 +376,12 @@ th.sorted.desc .sort-ind { border-top: 6px solid var(--accent); }
   outline-offset: 1px;
 }
 
+/* in-place copy success feedback (#53) */
+.iconbtn.ok, .btn.ok {
+  color: var(--ok);
+  border-color: var(--ok);
+}
+
 /* headings: unified treatment (mirrors .side-section h3) */
 .settings-head h1, .paste-title-bar h1, .head-row h1, .inner h1 {
   letter-spacing: -0.01em;
diff --git a/web/templates/history.html b/web/templates/history.html
index b65148a..4bcd4ff 100644
--- a/web/templates/history.html
+++ b/web/templates/history.html
@@ -10,13 +10,13 @@
     <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>
       <thead><tr>
-        <th data-sort="title" class="sortable">Paste<span class="sort-ind"></span></th>
-        <th data-sort="language" class="sortable">Language<span class="sort-ind"></span></th>
-        <th data-sort="size" class="sortable">Size<span class="sort-ind"></span></th>
-        <th data-sort="view_count" class="sortable">Views<span class="sort-ind"></span></th>
-        <th data-sort="created_at" class="sortable">Created<span class="sort-ind"></span></th>
-        <th data-sort="custom_slug" class="sortable">URL<span class="sort-ind"></span></th>
-        <th data-sort="id" class="sortable">ID<span class="sort-ind"></span></th>
+        <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>
+        <th data-sort="size" class="sortable"><span class="sort-ind"></span>Size</th>
+        <th data-sort="view_count" class="sortable"><span class="sort-ind"></span>Views</th>
+        <th data-sort="created_at" class="sortable"><span class="sort-ind"></span>Created</th>
+        <th data-sort="custom_slug" class="sortable"><span class="sort-ind"></span>URL</th>
+        <th data-sort="id" class="sortable"><span class="sort-ind"></span>ID</th>
       </tr></thead>
       <tbody id="rows"></tbody>
     </table>
@@ -115,8 +115,11 @@ async function load() {
   } else {
     $('empty').style.display = 'none';
     rows.innerHTML = items.map(it =>
-      `<tr class="row" data-href="/${esc(it.id)}"><td><a class="slug" href="/${esc(it.id)}">${esc(it.id)}</a>` +
-      (it.title ? `<div class="paste-sub">${esc(it.title)}</div>` : `<div class="paste-sub dim">none</div>`) + `</td>` +
+      `<tr class="row" data-href="/${esc(it.id)}"><td>` +
+      (it.title
+        ? `${esc(it.title)}`
+        : `<a class="slug" href="/${esc(it.id)}">${esc(it.id)}</a>`) +
+      `</td>` +
       `<td><span class="badge">${esc(it.language || 'text')}</span></td>` +
       `<td class="dim">${fmtSize(it.size)}</td><td class="dim">${it.view_count}</td><td class="dim" data-ts="${it.created_at}">${ago(it.created_at)}</td>` +
       (it.custom_slug ? `<td><a class="slug url-link" href="/${esc(it.custom_slug)}">/${esc(it.custom_slug)}</a></td>` : `<td class="dim">none</td>`) +
diff --git a/web/templates/mine.html b/web/templates/mine.html
index a933261..73cc647 100644
--- a/web/templates/mine.html
+++ b/web/templates/mine.html
@@ -57,8 +57,8 @@ async function load() {
   }
   $('empty').style.display = 'none';
   rows.innerHTML = data.items.map(it =>
-    `<tr class="row" data-href="/${esc(it.id)}"><td><a class="slug" href="/${esc(it.id)}">${esc(it.id)}</a>` +
-    (it.title ? `<div class="paste-sub">${esc(it.title)}</div>` : `<div class="paste-sub dim">none</div>`) + `</td>` +
+    `<tr class="row" data-href="/${esc(it.id)}"><td>` +
+    (it.title ? `${esc(it.title)}` : `<a class="slug" href="/${esc(it.id)}">${esc(it.id)}</a>`) + `</td>` +
     `<td><span class="badge">${esc(it.language || 'text')}</span></td>` +
     `<td class="dim">${fmtSize(it.size)}</td><td class="dim" data-ts="${it.created_at}">${ago(it.created_at)}</td>` +
     (it.custom_slug ? `<td><a class="slug url-link" href="/${esc(it.custom_slug)}">/${esc(it.custom_slug)}</a></td>` : `<td class="dim">none</td>`) +
diff --git a/web/templates/new.html b/web/templates/new.html
index 1862108..48bd805 100644
--- a/web/templates/new.html
+++ b/web/templates/new.html
@@ -169,9 +169,17 @@ async function create() {
     return;
   }
   const url = location.origin + '/' + (data.custom_slug || data.id);
-  showResult('<a href="' + url + '">' + url + '</a>', false);
+  showResult('<a href="' + url + '">' + url + '</a> <button class="btn btn-icon" id="result-copy" title="Copy URL" type="button">⧉</button>', false);
   $('result').dataset.token = data.deletion_token || '';
-  try { navigator.clipboard.writeText(url); toast('Copied', 'success'); } catch(e) {}
+  const copyBtn = document.getElementById('result-copy');
+  copyBtn.addEventListener('click', () => {
+    try {
+      navigator.clipboard.writeText(url);
+      copyBtn.classList.add('ok');               // in-place success feedback (#53)
+      copyBtn.textContent = 'Success!';
+      setTimeout(() => { copyBtn.classList.remove('ok'); copyBtn.textContent = '⧉'; }, 2000);
+    } catch(e) { toast('Copy failed', 'error'); }
+  });
   const dest = '/' + data.id + '?created=1&token=' + encodeURIComponent(data.deletion_token || '');
   // password-protected: unlock now with the password we already have (#26)
   if ($('haspw').checked && data.id) {
diff --git a/web/templates/paste.html b/web/templates/paste.html
index 507e9cf..1464145 100644
--- a/web/templates/paste.html
+++ b/web/templates/paste.html
@@ -4,10 +4,10 @@
   <div class="float">
     <div class="paste-title-bar">
       <h1>{{if .Title}}{{.Title}}{{else}}Untitled paste{{end}}</h1>
-      <span class="slug">/{{if .CustomSlug}}{{.CustomSlug}}{{else}}{{.ID}}{{end}}</span>
+      {{if .CustomSlug}}<span class="slug">/{{.CustomSlug}}</span>{{end}}
       <div class="spacer"></div>
       <a class="iconbtn" href="/raw/{{.ID}}">raw</a>
-      <a class="iconbtn" href="#" onclick="copyContent(); return false;">copy</a>
+      <a class="iconbtn" href="#" id="copy-btn" onclick="copyContent(this); return false;">copy</a>
       {{if .DeletionToken}}<a class="iconbtn danger" href="#" onclick="redeem('{{.DeletionToken}}'); return false;">delete</a>{{end}}
     </div>
   </div>
@@ -63,9 +63,17 @@ function toggleStats() {
   pill.classList.toggle('open', open);
   btn.setAttribute('aria-expanded', open ? 'true' : 'false');
 }
-function copyContent() {
+function copyContent(btn) {
   navigator.clipboard.writeText(document.getElementById('raw-content').value);
-  toast('Copied');
+  // 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(token) {
   if (!confirm('Hard delete this paste immediately?')) return;