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

body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f2f3f5;
  display: flex;
  height: 100vh;
  justify-content: center;
  align-items: center;
}

.container {
  background: white;
  padding: 40px;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

h1 {
  font-size: 2.2rem;
  margin-bottom: 20px;
}

.timer {
  font-size: 4rem;
  font-weight: bold;
  margin: 20px 0;
  color: #333;
}

.buttons button {
  margin: 10px;
  padding: 10px 20px;
  font-size: 1.1rem;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.3s ease;
}

#start { background-color: #28a745; color: white; }
#pause { background-color: #ffc107; color: white; }
#reset { background-color: #dc3545; color: white; }

#start:hover { background-color: #218838; }
#pause:hover { background-color: #e0a800; }
#reset:hover { background-color: #c82333; }

#session-type {
  margin-top: 15px;
  font-size: 1.2rem;
  color: #666;
}