.app{background:#fff;border-radius:12px;box-shadow:0 10px 40px #0003;overflow:hidden}.app-header{background:linear-gradient(135deg,#667eea,#764ba2);padding:1.5rem;text-align:center}.app-header h1{color:#fff;font-size:2rem;font-weight:300;letter-spacing:.5em;margin:0}.app-main{padding:1.5rem}.todo-input{display:flex;gap:.5rem;margin-bottom:1rem}.todo-input input{flex:1;padding:.75rem 1rem;font-size:1rem;border:2px solid #e0e0e0;border-radius:8px;outline:none;transition:border-color .2s}.todo-input input:focus{border-color:#667eea}.todo-input button{padding:.75rem 1.5rem;font-size:1rem;background:#667eea;color:#fff;border:none;border-radius:8px;cursor:pointer;transition:background .2s}.todo-input button:hover:not(:disabled){background:#5a6fd6}.todo-input button:disabled{background:#ccc;cursor:not-allowed}.todo-filter{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:.5rem;margin-bottom:1rem;padding:.75rem;background:#f5f5f5;border-radius:8px}.filter-buttons{display:flex;gap:.25rem}.filter-buttons button{padding:.5rem 1rem;font-size:.875rem;background:transparent;border:none;border-radius:4px;cursor:pointer;color:#666;transition:all .2s}.filter-buttons button:hover{background:#e0e0e0}.filter-buttons button.active{background:#667eea;color:#fff}.clear-completed{padding:.5rem 1rem;font-size:.875rem;background:transparent;border:1px solid #e57373;border-radius:4px;cursor:pointer;color:#e57373;transition:all .2s}.clear-completed:hover{background:#e57373;color:#fff}.todo-list-container{min-height:100px}.empty-message{text-align:center;color:#999;padding:2rem;font-size:1rem}.todo-list{list-style:none}.todo-item{display:flex;align-items:center;padding:.75rem;border-bottom:1px solid #eee;transition:background .2s}.todo-item:hover{background:#fafafa}.todo-item:last-child{border-bottom:none}.todo-item.completed .todo-text{text-decoration:line-through;color:#999}.todo-label{flex:1;display:flex;align-items:center;gap:.75rem;cursor:pointer}.todo-label input[type=checkbox]{width:20px;height:20px;cursor:pointer;accent-color:#667eea}.todo-text{font-size:1rem;color:#333;word-break:break-word}.delete-btn{padding:.25rem .5rem;font-size:1.25rem;background:transparent;border:none;cursor:pointer;color:#ccc;transition:color .2s;line-height:1}.delete-btn:hover{color:#e57373}.todo-stats{margin-top:1rem;padding-top:1rem;border-top:1px solid #eee;text-align:center;color:#666;font-size:.875rem}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;padding:2rem}#root{max-width:600px;margin:0 auto}