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h3{font-size:14px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px}.toc-content{flex:1;overflow-y:auto;padding:8px 0}.toc-item{padding:12px 16px;font-size:14px;color:var(--text-secondary);cursor:pointer;border-left:3px solid transparent;transition:all .2s;white-space:normal;line-height:1.4;overflow:hidden;display:flex;justify-content:space-between;align-items:center}.toc-item:hover{background-color:#f5f5f5;color:var(--text-primary)}.toc-item.active-page{background-color:#fff0f2;color:var(--accent);border-left-color:var(--accent);font-weight:600}.toc-item.expanded{background-color:#fafafa;font-weight:600;color:var(--text-primary)}.toc-arrow{font-size:10px;transition:transform .3s ease;opacity:.5}.toc-item.expanded .toc-arrow{transform:rotate(90deg);opacity:1}.toc-submenu{overflow:hidden;max-height:0;transition:max-height .4s cubic-bezier(.4,0,.2,1);background:#fafafa}.toc-submenu.open{max-height:1000px}.toc-submenu 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