/* Resetting and global styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #001d4a, #04396e); /* Warna gradien biru gelap */
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  color: #fff;
  position: relative;
}

/* Container styles */
.container {
  background: #ffffff;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3); /* Bayangan */
  padding: 30px;
  width: 100%;
  max-width: 450px;
  text-align: center;
  color: #333;
}

/* Header section */
header h1 {
  font-size: 1.8rem;
  font-weight: bold;
  color: #001d4a;
  margin-bottom: 10px;
}

header p {
  font-size: 0.9rem;
  color: #555;
  margin-bottom: 20px;
}

/* Form styles */
input {
  display: block;
  width: 100%;
  padding: 12px;
  font-size: 16px;
  margin-bottom: 15px;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

select {
  width: 100%;
  padding: 12px;
  font-size: 16px;
  margin-bottom: 15px;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

/* Currency selectors with swap button */
.currency-selectors {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 15px;
}

.currency-selectors select {
  width: 45%;
}

.swap-button {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #1e90ff;
  color: #ffffff;
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.swap-button:hover {
  background-color: #1c7ed6;
}

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

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

/* Result box */
#result {
  margin-top: 20px;
  padding: 15px;
  font-size: 18px;
  background: #f4f4f4;
  border-radius: 8px;
  text-align: center;
  color: #333;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Footer */
footer p {
  font-size: 0.8rem;
  color: #777;
  margin-top: 20px;
}