#typing-tester {
  transition: all 0.3s ease;
}

.sentence-group {
  margin-bottom: 1.5rem;
}

.sentence-group p {
  min-height: 60px;
  display: flex;
  align-items: center;
}

.sentence-group input {
  font-size: 1rem;
  margin-top: 1rem;
}

.phone-mode .sentence-group p,
.phone-mode .sentence-group input {
  font-size: 1.25rem;
}

.phone-mode button {
  font-size: 1.1rem;
  padding: 0.75rem 1.5rem;
}

#timer {
  font-size: 1.25rem;
  color: #1f2937;
}

#performance-graph {
  max-height: 250px;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
}

@media (max-width: 640px) {
  #typing-tester {
    padding: 1rem;
  }
  
  select, button {
    font-size: 1rem;
  }
  
  .sentence-group p {
    font-size: 1.1rem;
  }
  
  .sentence-group input {
    font-size: 1.1rem;
  }
  
  #timer {
    font-size: 1.1rem;
  }
  
  #performance-graph {
    max-height: 200px;
  }
}