body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #1e1e2f;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  text-align: center;
  background: #2a2a40;
  padding: 40px;
  border-radius: 20px;
  box-shadow: 0 0 20px rgba(0,0,0,0.3);
}

h1 {
  margin-bottom: 20px;
}

#timer {
  font-size: 72px;
  margin: 20px 0;
  font-weight: bold;
}

.buttons {
  display: flex;    
  gap: 10px;
  justify-content: center;
}

button {
  padding: 10px 20px;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  cursor: pointer;
  transition: 0.2s;
}

button:hover {
  transform: scale(1.05);
}

#startBtn {
  background: #4caf50;
  color: white;
}

#pauseBtn {
  background: #ff9800;
  color: white;
}

#resetBtn {
  background: #f44336;
  color: white;
}

#mode {
  margin-top: 20px;
  opacity: 0.8;
}