body {
  font-family: Arial;
  background: #f4f6f9;
  margin: 0;
  padding: 10px;
}

h2 {
  text-align: center;
}

.container {
  max-width: 700px;
  margin: auto;
}

/* FORM */
.form {
  background: white;
  padding: 15px;
  border-radius: 10px;
}

.form input {
  width: 100%;
  padding: 12px;
  margin: 8px 0;
  border: 1px solid #ddd;
  border-radius: 6px;
}

.btn-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button {
  flex: 1;
  padding: 12px;
  border: none;
  background: #27ae60;
  color: white;
  border-radius: 6px;
  cursor: pointer;
}

button.secondary {
  background: #2980b9;
}

.download {
  width: 100%;
  margin-top: 15px;
}

/* INVOICE */
.invoice-box {
  background: white;
  padding: 15px;
  margin-top: 15px;
  border-radius: 10px;
}

.header {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}

.info {
  margin-top: 10px;
}

table {
  width: 100%;
  margin-top: 15px;
  border-collapse: collapse;
}

td, th {
  padding: 8px;
  border-bottom: 1px solid #ddd;
  text-align: left;
}

/* QR */
.qr-section {
  text-align: center;
  margin-top: 15px;
}

/* MOBILE */
@media (max-width: 500px) {
  .header {
    flex-direction: column;
    gap: 10px;
  }
}