body {
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  margin: 0;
  padding: 0;
}

.container {
  width: 90%;
  max-width: 500px;
  margin: 60px auto;
  padding: 25px;
  background: white;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.dropdown {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap; /* Important for mobile */
}

#amount {
  width: 100%;
  padding: 10px;
  outline: none;
  border: 2px solid lightgray;
  font-size: 18px;
  border-radius: 5px;
  box-sizing: border-box;
}

select {
  width: 70px;
  height: 35px;
  font-size: 1rem;
}

#convertBtn {
  background-color: aliceblue;
  width: 100%;
  max-width: 250px;
  height: 40px;
  font-size: 18px;
  margin-top: 30px;
  cursor: pointer;
  border-radius: 5px;
  border: none;
  transition: 0.3s;
}

#convertBtn:hover {
  background-color: lightblue;
}

/* 📱 Mobile Responsive */
@media (max-width: 480px) {
  .container {
    width: 95%;
    margin: 30px auto;
    padding: 15px;
  }

  #amount {
    font-size: 16px;
  }

  .dropdown {
    gap: 1rem;
  }

  select {
    width: 60px;
    height: 30px;
  }

  #convertBtn {
    font-size: 16px;
    height: 38px;
  }
}