.chapter-block{margin:26px 0 45px}.chapter-head{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-bottom:16px}.chapter-head span{font-size:12px;font-weight:900;color:#7357e8;letter-spacing:1.5px}.chapter-head h2{font:800 30px 'Baloo 2';margin:2px 0}.mode-actions{display:flex;gap:8px;flex-wrap:wrap}.mode-actions a{background:#fff;border:2px solid #e9e3ff;padding:10px 13px;border-radius:13px;font-weight:800;color:#6249c8}.difficulty-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.difficulty-grid form{display:block}.difficulty-card{width:100%;min-height:230px;border:2px solid #eee;border-radius:25px;background:#fff;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:10px;cursor:pointer;font-family:Nunito}.difficulty-card:hover{transform:translateY(-5px);border-color:#7459e4}.difficulty-card i{font-style:normal;font-size:55px}.difficulty-card strong{font:800 28px 'Baloo 2'}.difficulty-card span{color:#76809c}.level-medium{background:#fffaf0}.level-hard{background:#fff5f1}@media(max-width:700px){.chapter-head{display:block}.mode-actions{margin-top:12px}.difficulty-grid{grid-template-columns:1fr}.difficulty-card{min-height:150px}}