feat(lesson-preparation): 浮动工具条 + 锚点/inline-node/对话体样式

src/app/globals.css

@@ -341,3 +341,137 @@
     page-break-inside: avoid;
   }
 }
+
+/* ============================================================
+ * V4 备课编辑器：纸区工具条 + 锚点 + inline-node + 对话体样式
+ * ============================================================ */
+
+/* V4 备课编辑器：纸区工具条 */
+.lp-paper-toolbar {
+  position: sticky;
+  top: 0;
+  margin: -64px -72px 24px;
+  padding: 10px 72px;
+  background: rgba(255,255,255,0.92);
+  backdrop-filter: blur(8px);
+  border-bottom: 1px solid var(--border);
+  display: flex;
+  gap: 2px;
+  z-index: 5;
+}
+.lp-tb-btn {
+  width: 28px; height: 28px;
+  border: none; background: transparent;
+  border-radius: 4px; cursor: pointer;
+  font-family: 'Inter', sans-serif;
+  font-size: 13px; color: var(--foreground);
+  display: inline-flex; align-items: center; justify-content: center;
+  transition: background .12s;
+}
+.lp-tb-btn:hover { background: var(--muted); }
+.lp-tb-btn.is-active { background: var(--muted); color: var(--foreground); }
+.lp-tb-btn.b { font-weight: 700; }
+.lp-tb-btn.i { font-style: italic; font-family: 'Fraunces', serif; }
+.lp-tb-btn.h1 { font-size: 11px; font-weight: 600; }
+.lp-tb-btn.h2 { font-size: 10px; font-weight: 600; }
+.lp-tb-btn.ul { font-size: 14px; }
+.lp-tb-btn.quote { font-family: 'Fraunces', serif; font-style: italic; font-size: 14px; }
+.lp-tb-divider {
+  width: 1px;
+  background: var(--border);
+  margin: 4px 4px;
+}
+
+/* V4 锚点样式 */
+.lp-anchor-range {
+  background: var(--lp-anchor-range);
+  border-radius: 2px;
+  padding: 1px 2px;
+  margin: 0 -2px;
+  cursor: pointer;
+  border-bottom: 1.5px solid var(--lp-anchor-point);
+  transition: background .15s;
+}
+.lp-anchor-range:hover, .lp-anchor-range.is-active {
+  background: var(--lp-anchor-range-active);
+}
+.lp-anchor-point {
+  display: inline-block;
+  width: 16px; height: 16px;
+  line-height: 16px;
+  text-align: center;
+  border-radius: 50%;
+  background: var(--lp-anchor-point);
+  color: #fff;
+  font-family: 'Inter', sans-serif;
+  font-size: 9px;
+  font-weight: 600;
+  margin: 0 2px;
+  vertical-align: middle;
+  cursor: pointer;
+}
+
+/* V4 inline-node 样式 */
+.lp-inline-node {
+  font-family: 'Inter', sans-serif;
+  margin: 20px 0 20px;
+  padding: 14px 18px 14px 20px;
+  border-left: 2px solid var(--lp-inline-node-border);
+  color: var(--lp-inline-node-text);
+  font-size: 13.5px;
+  line-height: 1.65;
+  transition: border-color .2s;
+}
+.lp-inline-node:hover { border-left-color: var(--foreground); }
+.lp-inline-node-head {
+  display: flex; align-items: center; gap: 8px;
+  margin-bottom: 8px;
+  font-size: 10px; font-weight: 600;
+  text-transform: uppercase; letter-spacing: 0.08em;
+  color: var(--lp-inline-node-meta);
+}
+.lp-inline-node-title {
+  font-family: 'Inter', sans-serif;
+  font-weight: 600;
+  font-size: 14px;
+  color: #1a1a1a;
+  margin: 0 0 6px;
+  line-height: 1.35;
+}
+.lp-inline-node-body {
+  font-size: 13px;
+  line-height: 1.6;
+  color: #404040;
+}
+
+/* V4 师生交互对话体 */
+.lp-qa-dialog { margin: 8px 0 4px; }
+.lp-qa-turn {
+  display: grid;
+  grid-template-columns: 28px 1fr;
+  gap: 10px;
+  padding: 8px 0;
+  border-bottom: 1px dashed var(--border);
+  font-size: 12.5px;
+  line-height: 1.55;
+}
+.lp-qa-turn:last-child { border-bottom: none; }
+.lp-qa-role {
+  font-family: 'JetBrains Mono', monospace;
+  font-size: 9px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  padding-top: 2px;
+  text-align: right;
+}
+.lp-qa-role.teacher { color: #1c1917; }
+.lp-qa-role.student { color: #6b7280; }
+.lp-qa-content { color: #404040; }
+.lp-qa-prompt {
+  font-style: italic;
+  color: #525252;
+  font-size: 11px;
+  display: block;
+  margin-top: 2px;
+}