.app{min-height:100vh;padding:20px;max-width:1200px;margin:0 auto}.app-header{text-align:center;color:#fff;margin-bottom:30px}.app-header h1{font-size:2.5rem;margin-bottom:20px;text-shadow:2px 2px 4px rgba(0,0,0,.3)}.score-display{display:flex;justify-content:center;gap:30px;font-size:1.5rem;font-weight:700}.game-container{display:flex;flex-direction:column;align-items:center;gap:30px}.board-container{background:#fff;padding:20px;border-radius:10px;box-shadow:0 10px 30px #0000004d}.board{display:inline-block;border:2px solid #333}.board-row{display:flex}.cell{width:40px;height:40px;border:1px solid #ddd;cursor:pointer;transition:background-color .2s;position:relative;display:flex;align-items:center;justify-content:center}.cell.empty{background-color:#f5f5f5}.cell.empty.hint{background-color:#e6f2ff;border:2px dashed #4a90e2}.cell.empty:hover{background-color:#e0e0e0;cursor:pointer}.cell.empty.selected-hover{background-color:#b3d9ff;border:2px solid #4a90e2}.cell.empty.solution{background-color:#dbeafe;border:2px solid #60a5fa}.solution-label{font-size:.85rem;font-weight:700;color:#1d4ed8}.cell.occupied{background-color:#4a90e2}.blocks-container{background:#fff;padding:20px;border-radius:10px;box-shadow:0 10px 30px #0000004d;width:100%;max-width:600px}.blocks-container h3{margin-bottom:15px;text-align:center}.blocks-list{display:flex;flex-wrap:wrap;gap:15px;justify-content:center}.block-item{padding:15px;border:2px solid #ddd;border-radius:8px;cursor:pointer;transition:all .2s;text-align:center}.block-item:hover{border-color:#4a90e2;transform:translateY(-2px);box-shadow:0 4px 8px #0003}.block-item.selected{border-color:#4a90e2;background-color:#e3f2fd;box-shadow:0 4px 12px #4a90e266}.block-preview{display:grid;--cell-size: 20px;gap:2px;margin-bottom:10px;justify-content:center}.block-cell{background-color:#4a90e2;border-radius:2px}.block-name{font-size:.9rem;color:#666;font-weight:500}.controls{display:flex;gap:15px}.controls button{padding:12px 24px;font-size:1rem;background-color:#4a90e2;color:#fff;border:none;border-radius:6px;cursor:pointer;transition:background-color .2s}.controls button:hover{background-color:#357abd}.controls button:disabled{opacity:.6;cursor:not-allowed}.game-over{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:#fff;padding:40px;border-radius:10px;box-shadow:0 10px 40px #00000080;text-align:center;z-index:1000}.game-over h2{margin-bottom:20px;color:#333}.game-over p{margin-bottom:20px;font-size:1.2rem;color:#666}.game-over button{padding:12px 24px;font-size:1rem;background-color:#4a90e2;color:#fff;border:none;border-radius:6px;cursor:pointer}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;display:flex;align-items:center;justify-content:center;z-index:1200;padding:20px}.modal-card{background:#fff;border-radius:12px;padding:24px;width:min(520px,90vw);box-shadow:0 20px 50px #00000059}.modal-card h2{margin-bottom:8px;color:#1d1d1f}.modal-card p{margin-bottom:16px;color:#4b5563}.modal-card input{width:100%;padding:12px 14px;border:1px solid #d1d5db;border-radius:8px;font-size:1rem}.modal-error{margin-top:8px;color:#dc2626;font-size:.9rem}.modal-actions{margin-top:20px;display:flex;justify-content:flex-end;gap:12px}.modal-actions button{padding:10px 18px;border:none;border-radius:8px;background:#4a90e2;color:#fff;cursor:pointer}.leaderboard-card{width:min(640px,92vw)}.leaderboard-section{margin-top:16px}.leaderboard-section h3{margin-bottom:8px;color:#111827}.leaderboard-section ol{list-style:decimal inside;display:grid;gap:6px;padding-left:0;margin:0}.leaderboard-section li{display:flex;justify-content:space-between;background:#f3f4f6;padding:8px 12px;border-radius:6px;font-weight:600;color:#1f2937}.leaderboard-empty{color:#6b7280;font-size:.95rem}@media (max-width: 768px){.app-header h1{font-size:2rem}.cell{width:30px;height:30px}.block-preview{--cell-size: 15px}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh}#root{min-height:100vh}