/* Reset dasar */
* {
  box-sizing: border-box;
}

/* Body */
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  max-width: 600px;
  margin: 40px auto;
  padding: 20px 30px;
  background: #f4f7f8;
  color: #333;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* Heading */
h2 {
  text-align: center;
  color: #2c3e50;
  margin-bottom: 25px;
}

/* Label */
label {
  font-weight: 600;
  display: block;
  margin-top: 15px;
  color: #34495e;
}

/* Input umum */
input[type="text"],
input[type="number"] {
  width: 100%;
  padding: 10px 14px;
  margin-top: 6px;
  border: 2px solid #bdc3c7;
  border-radius: 6px;
  font-size: 16px;
  transition: border-color 0.3s ease;
}

input[type="text"]:focus,
input[type="number"]:focus {
  border-color: #2980b9;
  outline: none;
  background-color: #ecf6fd;
}

/* Container ASN input */
.asn-input {
  background: white;
  padding: 15px 20px;
  margin-top: 20px;
  border-radius: 8px;
  border: 1px solid #dcdcdc;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

/* Tombol */
button {
  display: block;
  margin: 25px auto 0;
  padding: 12px 30px;
  width: 50%;
  font-size: 18px;
  font-weight: 700;
  color: white;
  background: linear-gradient(135deg, #2980b9, #3498db);
  border: none;
  border-radius: 30px;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(52,152,219,0.4);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

button:hover {
  background: linear-gradient(135deg, #3498db, #2980b9);
  box-shadow: 0 6px 20px rgba(52,152,219,0.6);
}

/* Hasil */
#hasil {
  margin-top: 30px;
  text-align: center;
  font-size: 22px;
  color: #27ae60;
  font-weight: 700;
}

/* Tampilan untuk layar dengan lebar maksimum 480px (mobile) */
@media (max-width: 480px) {
  body {
    padding: 15px 20px;
    max-width: 100%;
    margin: 20px auto;
    font-size: 16px;
  }

  button {
    width: 90%;       /* Lebih lebar di mobile supaya gampang ditekan */
    font-size: 16px;
    padding: 10px 20px;
  }

  input[type="text"],
  input[type="number"] {
    font-size: 14px;
    padding: 8px 10px;
  }

  h2 {
    font-size: 24px;
  }

  #hasil {
    font-size: 18px;
  }
}