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<div class="filter-panel"> <div class="filter-group"> <label>📚 CHAPTER (MS Chouhan)</label> <select id="chapterFilter"> <option value="all">All chapters</option> <option value="goc">General Organic Chemistry (GOC)</option> <option value="hydrocarbons">Hydrocarbons (Alkane, Alkene, Alkyne)</option> <option value="haloalkanes">Haloalkanes & Haloarenes</option> <option value="alcohols">Alcohols, Phenols & Ethers</option> <option value="carbonyl">Aldehydes, Ketones & Acids</option> <option value="amines">Amines & Diazonium</option> <option value="biomolecules">Biomolecules & Practical</option> </select> </div> <div class="filter-group"> <label>🎯 DIFFICULTY</label> <select id="difficultyFilter"> <option value="all">All levels</option> <option value="easy">Easy (single concept)</option> <option value="medium">Medium (multi-step)</option> <option value="advanced">Advanced (MS Chouhan special)</option> </select> </div> <div class="filter-group"> <label>🔍 SEARCH (keywords)</label> <input type="text" id="searchInput" class="search-input" placeholder="e.g., SN1, aromatic, ozonolysis"> </div> <button id="resetFilters" class="reset-btn">⟳ Reset all</button> </div> organic chemistry ms chouhan
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// toggle hint mechanism (inline) function attachHintListeners() document.querySelectorAll('.btn-hint').forEach(btn => // remove existing listener to avoid duplicates (simple approach) const newBtn = btn.cloneNode(true); btn.parentNode.replaceChild(newBtn, btn); newBtn.addEventListener('click', (e) => ); ); 📚 CHAPTER (MS Chouhan)<