body {
  font-family: 'Segoe UI', sans-serif;
  background: #f0f4f8;
  margin: 0;
  padding: 20px;
  color: #333;
}
.container {
  max-width: 360px;
  margin: auto;
  background: #fff;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  text-align: center;
}
.logo {
  max-width: 120px;
  margin: 0 auto;
  display: block;
}
h1 {
  font-size: 20px;
  margin-bottom: 15px;
  color: #187524;
}
input[type="text"] {
  width: calc(100% - 20px);
  padding: 8px;
  margin-bottom: 10px;
  border: 1px solid #ccc;
  border-radius: 8px;
}
button {
  margin: 5px;
  padding: 10px 16px;
  border: none;
  background: #00796b;
  color: #fff;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s;
}
button:hover {
  background: #005f56;
}
.spinner {
  border: 6px solid #f3f3f3;
  border-top: 6px solid #00796b;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 10px auto;
}
.hidden {
  display: none;
}
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}
.result-box {
  margin-top: 15px;
  text-align: left;
  background: #eefff2;
  padding: 15px;
  border-radius: 8px;
  min-height: 80px;
  overflow-y: auto;
}
.footer {
  margin-top: 20px;
  font-size: 12px;
}
.footer a {
  color: #00796b;
  text-decoration: none;
}
.footer a:hover {
  text-decoration: underline;
}
.qr-code {
  width: 80px;
  margin-top: 10px;
}