feat(reader): implement FEAT-01 Focus Zen Mode (100% vh/vw, auto-hiding HUD, hotkeys F/Esc, native fullscreen)

app/static/css/grammar_cefr.css

@@ -1688,3 +1688,151 @@
     }
 }
 
+/* ==========================================================================
+   FEAT-02: Murphy Cheatsheet Tables & Rich Detailed Notes
+   ========================================================================== */
+
+.grammar-table-wrap {
+    width: 100%;
+    overflow-x: auto;
+    -webkit-overflow-scrolling: touch;
+    border-radius: var(--radius-md);
+    border: 1px solid var(--border-color);
+    background: var(--bg-card);
+    box-shadow: var(--shadow-sm);
+    margin: 12px 0 16px 0;
+}
+
+.grammar-cheatsheet-table {
+    width: 100%;
+    border-collapse: collapse;
+    font-size: 13.5px;
+    line-height: 1.5;
+    text-align: left;
+}
+
+.grammar-cheatsheet-table thead th {
+    background: var(--bg-surface-hover);
+    color: var(--text-main);
+    font-weight: 700;
+    padding: 10px 14px;
+    border-bottom: 2px solid var(--border-color);
+    white-space: nowrap;
+}
+
+.grammar-cheatsheet-table tbody td {
+    padding: 10px 14px;
+    border-bottom: 1px solid var(--border-color);
+    color: var(--text-main);
+    vertical-align: top;
+}
+
+.grammar-cheatsheet-table tbody tr:last-child td {
+    border-bottom: none;
+}
+
+.grammar-cheatsheet-table tbody tr:hover {
+    background: rgba(99, 102, 241, 0.04);
+}
+
+.grammar-inline-code {
+    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
+    font-size: 12.5px;
+    background: var(--bg-input);
+    color: var(--color-primary);
+    padding: 2px 5px;
+    border-radius: 4px;
+    border: 1px solid var(--border-color);
+}
+
+.grammar-notes-box {
+    background: var(--bg-card);
+    border: 1px solid var(--border-color);
+    border-radius: var(--radius-lg);
+    padding: 20px 24px;
+    color: var(--text-main);
+    font-size: 14px;
+    line-height: 1.65;
+    box-shadow: var(--shadow-sm);
+}
+
+.grammar-notes-box .grammar-note-h3 {
+    font-size: 16px;
+    font-weight: 800;
+    color: var(--text-main);
+    margin: 16px 0 8px 0;
+    letter-spacing: -0.01em;
+}
+
+.grammar-notes-box .grammar-note-h4 {
+    font-size: 15px;
+    font-weight: 700;
+    color: var(--color-primary);
+    margin: 16px 0 8px 0;
+}
+
+.grammar-notes-box .grammar-note-h5 {
+    font-size: 13.5px;
+    font-weight: 700;
+    color: var(--text-muted);
+    margin: 12px 0 6px 0;
+    text-transform: uppercase;
+    letter-spacing: 0.03em;
+}
+
+.grammar-notes-box .grammar-note-p {
+    margin: 0 0 10px 0;
+}
+
+.grammar-notes-box .grammar-note-quote {
+    border-left: 3px solid var(--color-primary);
+    background: rgba(99, 102, 241, 0.06);
+    padding: 8px 14px;
+    margin: 10px 0;
+    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
+    font-style: italic;
+    color: var(--text-main);
+}
+
+.grammar-notes-list {
+    margin: 0 0 12px 0;
+    padding-left: 20px;
+}
+
+.grammar-notes-list li {
+    margin-bottom: 6px;
+    line-height: 1.55;
+}
+
+/* Collapsible Practice Cheatsheet Drawer */
+.practice-cheatsheet-toggle-wrap {
+    margin-bottom: 16px;
+}
+
+.practice-cheatsheet-btn {
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+    font-size: 12.5px;
+    font-weight: 600;
+    padding: 6px 12px;
+    border-radius: var(--radius-md);
+    background: var(--bg-surface);
+    border: 1px solid var(--border-color);
+    color: var(--text-muted);
+    cursor: pointer;
+    transition: all 0.15s ease;
+}
+
+.practice-cheatsheet-btn:hover {
+    color: var(--text-main);
+    background: var(--bg-surface-hover);
+    border-color: var(--color-primary);
+}
+
+.practice-cheatsheet-drawer {
+    margin-top: 10px;
+    animation: fadeIn 0.2s ease-out;
+}
+
+