body {
  font-family: Arial, sans-serif;
  background: #f2f2f2;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 900px;
  margin: auto;
  background: white;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 0 15px rgba(0,0,0,0.2);
}

header {
  text-align: center;
  margin-bottom: 30px;
}

.logo {
  height: 80px;
  margin-bottom: 10px;
}

input[type="file"],
input[type="text"] {
  display: block;
  margin: 10px auto;
  padding: 8px;
  width: 80%;
  font-size: 16px;
}

button {
  display: inline-block;
  margin: 10px 5px;
  padding: 10px 20px;
  font-size: 16px;
  background-color: #1d72b8;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  background-color: #155a96;
}

.slip-box {
  background: #fff;
  padding: 30px;
  margin-top: 20px;
  border: 1px solid #ccc;
}

.error {
  color: red;
  text-align: center;
}