style.css

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #F3F4F9, #C9D6E3);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  color: #333;
}

.container {
  background: #ffffff;
  border-radius: 15px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  padding: 40px;
  width: 350px;
  text-align: center;
}

h1 {
  font-size: 26px;
  margin-bottom: 20px;
  color: #2D3A3A;
  font-weight: 600;
}

input, select {
  padding: 12px;
  margin: 10px 0;
  width: 100%;
  font-size: 16px;
  border-radius: 8px;
  border: 1px solid #E0E0E0;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

input:focus, select:focus {
  border: 1px solid #4CAF50;
  outline: none;
  box-shadow: 0 0 8px rgba(0, 180, 50, 0.2);
}

.currency-selectors {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
}

span {
  font-size: 18px;
  font-weight: 500;
  color: #555;
}

button {
  padding: 12px 20px;
  background-color: #4CAF50;
  color: white;
  border: none;
  border-radius: 8px;
  width: 100%;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #45a049;
}

#result {
  margin-top: 20px;
  font-size: 20px;
  font-weight: bold;
  color: #333;
  text-transform: uppercase;
}