* {
  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;
  position: relative;
}

.container {
  background: #ffffff;
  border-radius: 15px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  padding: 40px;
  width: 100%;
  max-width: 600px;
  text-align: center;
  position: relative;
}

header {
  background-color: #2D3A3A;
  color: #fff;
  padding: 10px 0;
  border-radius: 8px;
  margin-bottom: 20px;
}

h1 {
  font-size: 2rem;
  color: #fff;
}

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;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-color: #fff;
  color: #555;
}

/* Styling dropdown pilihan */
select {
  background-image: url('https://img.icons8.com/ios/452/down-squared.png');
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 20px;
  padding-right: 40px;
  font-size: 16px;
}

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

/* Gaya untuk selector mata uang */
.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;
  background-color: #f4f4f4;
  padding: 15px;
  border-radius: 8px;
  text-transform: uppercase;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

footer {
  width: 100%;
  background-color: #2D3A3A;
  color: #fff;
  text-align: center;
  padding: 10px 0;
  margin-top: 20px;
  border-radius: 8px;
}

footer p {
  font-size: 14px;
}

/* Responsif untuk Mobile */
@media (max-width: 768px) {
  .container {
    padding: 30px;
    max-width: 100%;
  }

  h1 {
    font-size: 1.5rem;
  }

  input, select {
    font-size: 14px;
  }

  button {
    font-size: 16px;
  }
}

/* Responsif untuk tampilan yang lebih besar (Tablet ke atas) */
@media (min-width: 769px) {
  .container {
    max-width: 700px;
  }

  h1 {
    font-size: 2.5rem;
  }

  input, select {
    font-size: 18px;
  }

  button {
    font-size: 20px;
  }
}