* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: #111827;
  color: white;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 1s ease;
}

.container {
  text-align: center;
}

h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  color: #f1f5f9;
}

.card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(8px);
  border-radius: 1rem;
  padding: 2rem;
  width: 300px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  transition: background 0.5s ease;
}

.phase-label {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  font-weight: bold;
  letter-spacing: 1px;
  opacity: 0.9;
}

.timer {
  font-size: 3.5rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
}

.cycle {
  font-size: 1rem;
  margin-bottom: 1rem;
  opacity: 0.75;
}

.buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

button {
  padding: 0.6rem 1rem;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.3s ease;
  color: white;
  background-color: #334155;
}

button:hover {
  transform: scale(1.05);
  background-color: #475569;
}