* {
  box-sizing: border-box;
}

body {
  font-family: "Poppins", sans-serif;
  background: linear-gradient(120deg, #1a2a6c, #b21f1f, #fdbb2d);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
}

#app {
  background: rgba(0, 0, 0, 0.4);
  padding: 2rem;
  border-radius: 16px;
  text-align: center;
  width: 90%;
  max-width: 400px;
}

h1 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

#controls {
  display: flex;
  justify-content: space-around;
  margin-bottom: 1rem;
}

#controls h2 {
  font-size: 1rem;
}

button {
  background: #fdbb2d;
  border: none;
  border-radius: 8px;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  margin: 0.3rem;
  cursor: pointer;
  color: #222;
  transition: 0.3s;
}

button:hover {
  background: #ffda79;
}

#timer {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
}

#time-left {
  font-size: 2.5rem;
  font-weight: bold;
}

#actions button {
  margin: 0.5rem;
}

@media (max-width: 500px) {
  #controls {
    flex-direction: column;
    gap: 1rem;
  }

  #app {
    width: 95%;
  }

  #time-left {
    font-size: 2rem;
  }
}