:root{--primary-color: #3498db;--primary-hover: #2980b9;--danger-color: #e74c3c;--danger-hover: #c0392b;--bg-color: #f4f7f6;--surface-color: #ffffff;--text-color: #333;--border-color: #ecf0f1}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg-color);color:var(--text-color);margin:0}.app-layout{display:grid;grid-template-columns:240px 1fr;min-height:100vh}.sidebar{background-color:var(--surface-color);padding:1.5rem;border-right:1px solid var(--border-color)}.sidebar h3{margin-top:0;color:var(--primary-color)}.sidebar ul{list-style:none;padding:0}.sidebar li{padding:.5rem 0;cursor:pointer;transition:color .2s}.sidebar li:hover{color:var(--primary-hover)}.main-content{padding:2rem}header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.btn-primary{padding:.75rem 1.5rem;border:none;border-radius:4px;background-color:var(--primary-color);color:#fff;font-size:1rem;cursor:pointer;transition:background-color .2s}.btn-primary:hover{background-color:var(--primary-hover)}.category-section{margin-bottom:2.5rem}.category-title{border-bottom:2px solid var(--primary-color);padding-bottom:.5rem;margin-bottom:1.5rem}.bookmarks-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem}.bookmark-card{background-color:var(--surface-color);border-radius:8px;box-shadow:0 4px 6px #0000000d;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}.bookmark-card:hover{transform:translateY(-5px);box-shadow:0 8px 12px #0000001a}.card-link{text-decoration:none;color:inherit;flex-grow:1;padding:1rem}.card-header{display:flex;align-items:center;gap:.75rem;margin-bottom:.5rem}.favicon{width:20px;height:20px;object-fit:contain}.card-title{font-size:1.1rem;margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.card-notes{font-size:.9rem;color:#7f8c8d;margin:.5rem 0 0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.card-actions{display:flex;justify-content:flex-end;gap:.5rem;padding:.5rem 1rem;border-top:1px solid var(--border-color)}.action-btn{background:none;border:none;cursor:pointer;padding:.25rem .5rem;font-size:.85rem;border-radius:4px;transition:background-color .2s}.edit-btn{color:var(--primary-color)}.edit-btn:hover{background-color:#ecf0f1}.delete-btn{color:var(--danger-color)}.delete-btn:hover{background-color:#ecf0f1}.modal-backdrop{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#00000080;display:flex;justify-content:center;align-items:center}.modal-content{background-color:#fff;padding:2rem;border-radius:8px;width:90%;max-width:500px;box-shadow:0 5px 15px #0000004d}.modal-content h2{margin-top:0}.form-group{margin-bottom:1rem}.form-group label{display:block;margin-bottom:.5rem;font-weight:500}.form-group input,.form-group textarea{width:100%;padding:.75rem;border:1px solid #ccc;border-radius:4px;box-sizing:border-box;font-size:1rem}.form-actions{display:flex;justify-content:flex-end;gap:1rem;margin-top:1.5rem}.btn-secondary{padding:.75rem 1.5rem;border:1px solid #ccc;border-radius:4px;background-color:transparent;cursor:pointer}.search-bar-container{flex-grow:1;margin:0 2rem}.search-input{width:100%;padding:.75rem;border:1px solid var(--border-color);border-radius:4px;font-size:1rem}.sidebar li.active{font-weight:700;color:var(--primary-color)}.main-content .no-bookmarks{text-align:center;color:#7f8c8d;margin-top:4rem}