feat: add responsive CSS for mobile layout

Co-Authored-By: Claude Opus 4.6 <[email protected]>

unredact/static/style.css

@@ -197,6 +197,27 @@ main {
   margin-bottom: 0.15rem;
 }
 
+.redaction-delete {
+  margin-left: auto;
+  background: none;
+  border: none;
+  color: var(--text-muted);
+  font-size: 0.9rem;
+  line-height: 1;
+  cursor: pointer;
+  padding: 0 0.25rem;
+  opacity: 0;
+  transition: opacity 0.15s, color 0.15s;
+}
+
+.redaction-item:hover .redaction-delete {
+  opacity: 1;
+}
+
+.redaction-delete:hover {
+  color: var(--red-light);
+}
+
 .redaction-num {
   font-size: 0.75rem;
   font-weight: 700;
@@ -749,3 +770,127 @@ main {
   from { opacity: 1; }
   to { opacity: 0; }
 }
+
+/* ── Mobile responsive (≤768px) ── */
+
+.mobile-tabs {
+  display: none;
+}
+
+@media (max-width: 768px) {
+  /* Header: compact */
+  header {
+    padding: 0.5rem 1rem;
+  }
+  header h1 {
+    font-size: 1.1rem;
+  }
+  .subtitle {
+    font-size: 0.7rem;
+  }
+
+  /* Main: tighter padding */
+  main {
+    padding: 0.5rem;
+  }
+
+  /* Controls bar: wrap on narrow screens */
+  #controls {
+    flex-wrap: wrap;
+    gap: 0.5rem;
+    padding: 0.4rem 0.6rem;
+  }
+
+  /* Tab bar: visible */
+  .mobile-tabs {
+    display: flex;
+    gap: 0;
+    flex-shrink: 0;
+    border-bottom: 1px solid var(--border);
+    background: var(--bg-surface);
+    border-radius: 8px 8px 0 0;
+  }
+  .mobile-tab {
+    flex: 1;
+    padding: 0.6rem 0;
+    background: none;
+    border: none;
+    color: var(--text-dim);
+    font-size: 0.85rem;
+    font-weight: 600;
+    cursor: pointer;
+    border-bottom: 2px solid transparent;
+    transition: color 0.15s, border-color 0.15s;
+  }
+  .mobile-tab.active {
+    color: var(--accent);
+    border-bottom-color: var(--accent);
+  }
+
+  /* Workspace: stack vertically */
+  #workspace {
+    flex-direction: column;
+  }
+
+  /* Left panel: hidden by default, full-width when active */
+  #left-panel {
+    display: none;
+    width: 100%;
+    border-radius: 0 0 8px 8px;
+  }
+  #left-panel.mobile-active {
+    display: block;
+  }
+
+  /* Right panel: hidden by default, full-size when active */
+  #right-panel {
+    display: none;
+    border-radius: 0 0 8px 8px;
+  }
+  #right-panel.mobile-active {
+    display: block;
+    flex: 1;
+  }
+
+  /* Popover: full-screen modal */
+  #popover {
+    position: fixed;
+    inset: 0;
+    width: 100%;
+    border-radius: 0;
+    z-index: 50;
+    background: rgba(20, 20, 40, 0.98);
+    backdrop-filter: none;
+  }
+
+  /* Font toolbar: full-width, no right offset */
+  #font-toolbar {
+    right: 0.5rem;
+    font-size: 0.7rem;
+    gap: 0.4rem;
+  }
+
+  /* Touch targets: larger buttons */
+  .tb-btn {
+    width: 2.2rem;
+    height: 2.2rem;
+    font-size: 0.85rem;
+  }
+
+  /* Solve controls: slightly larger inputs for touch */
+  .solve-controls select,
+  .solve-controls input {
+    padding: 4px 6px;
+    font-size: 0.85rem;
+  }
+  .solve-btn {
+    padding: 8px 20px;
+  }
+
+  /* Popover close button: larger touch target */
+  .popover-close-btn {
+    width: 2.2rem;
+    height: 2.2rem;
+    font-size: 0.9rem;
+  }
+}