.difficulty-panel{background:#fffaf0;border:1px solid #cbb58f;border-left:4px solid #914b35;border-radius:8px;padding:14px 18px;margin-bottom:18px}.difficulty-panel fieldset{border:0;padding:0;margin:0;min-width:0}.difficulty-panel legend{font-size:1rem;font-weight:700;color:#234e5c;margin-bottom:9px}.difficulty-choices{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.difficulty-choices button{background:#f4e8d0;border:1px solid #baa37c;border-radius:6px;padding:9px 12px;text-align:left;color:#3c3024;line-height:1.45}.difficulty-choices button>span{display:block;font-size:.875rem;margin-top:3px;color:#6b5740}.difficulty-choices button.active{background:#234e5c;border-color:#234e5c;color:#fffdf7}.difficulty-choices button.active>span{color:#fff1d4}.difficulty-choices button:hover:not(.active){background:#ead7b4}.difficulty-panel p{font-size:.95rem;margin-top:10px}.difficulty-panel .difficulty-progress{font-size:.875rem;color:#6b5740}.difficulty-note{font-size:.875rem!important;color:#6b5740}.notebook-levels{border-top:1px solid #cbb58f;padding-top:15px;margin-top:18px}.notebook-levels p{font-size:.95rem;margin-top:6px}@media(max-width:600px){.difficulty-panel{padding:12px}.difficulty-choices{gap:7px}.difficulty-choices button{padding:9px 7px;font-size:.875rem}.difficulty-choices button>span{font-size:.875rem}.difficulty-progress{line-height:1.7}}