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0;font-size:14px;text-decoration:none;display:block}.lesson-toc-link:hover{color:#1d4ed8;text-decoration:underline}.lesson-toc-item.level-1 .lesson-toc-link{padding-left:12px}.lesson-toc-item.level-2 .lesson-toc-link{color:#475569;padding-left:28px;font-size:13px}.lesson-preview{color:#1e293b;background:#fff;border:1px solid #e2e8f0;border-radius:8px;max-width:100%;padding:24px;line-height:1.8;overflow-y:auto}.lesson-preview h1{color:#0f172a;border-bottom:2px solid #e2e8f0;margin:24px 0 16px;padding-bottom:12px;font-size:28px;font-weight:700}.lesson-preview h2{color:#1e293b;margin:20px 0 12px;padding-top:12px;padding-left:0;font-size:22px;font-weight:700}.lesson-preview h3{color:#334155;box-sizing:border-box;margin:16px 0 10px;padding-left:1.125rem;font-size:22px;font-weight:700}.lesson-preview .lesson-under-h2{box-sizing:border-box;padding-left:1.35rem}.lesson-preview .lesson-under-h3{box-sizing:border-box;padding-left:3rem}.lesson-preview p{margin:12px 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pre{color:#e2e8f0;background:#1e293b;border-radius:6px;margin:16px 0;padding:16px;font-size:14px;overflow-x:auto}.lesson-preview pre code{color:inherit;background:0 0;padding:0}.editor-context-menu{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#fff;border:1px solid #e2e8f0;border-radius:12px;width:320px;padding:10px;box-shadow:0 20px 25px -5px #0000001a,0 10px 10px -5px #0000000a}.context-menu-inner{flex-direction:column;gap:6px;display:flex}.context-menu-inner .toolbar-group{border-bottom:1px solid #f1f5f9;border-right:none;flex-flow:wrap;align-items:center;gap:4px;padding:6px 0;display:flex}.context-menu-inner .toolbar-label{color:#94a3b8;width:100%;margin-bottom:4px;font-size:10px}.context-menu-inner .toolbar-btn{justify-content:center;align-items:center;width:auto;min-width:36px;height:32px;padding:0 8px;font-size:13px;display:inline-flex}.editor-content-container{cursor:text;min-height:500px;position:relative}.editor-hint{color:#94a3b8;pointer-events:none;font-size:11px;font-style:italic;position:absolute;top:10px;right:10px}@media (width<=1200px){.editor-toolbar{gap:8px}.toolbar-group{padding:0 6px}.toolbar-label{display:none}}