body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background: #f8f9fa;
  color: #333
}

.container {
  max-width: 500px;
  margin: 30px auto;
  background: #fff;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 0 12px rgba(0,0,0,0.1);
}

h2,h3 {
  text-align: center;
  color: #007bff;
}

ul#attendanceList {
  list-style: none;
  padding: 0;
}

#reader {
    margin: 0 auto;
    padding: 10px;
    border: 2px solid #007bff;
    border-radius: 10px;
    background-color: #e9ecef;
}

.result-card {
  background: #e6ffe6;
  border: 1px solid #28a745;
  border-radius: 10px;
  padding: 15px;
  margin-top: 20px;
  text-align: center;
}

ul#attendanceList li {
  padding: 5px;
  border-bottom: 1px solid #ccc;
}

label {
  display: block;
  margin: 10px 0 5px;
}

input {
  width: 100%;
  padding: 8px;
  margin-bottom: 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
}

button {
  width: 100%;
  padding: 10px;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 6px;
  font-weight: bold;
  cursor: pointer;
}

button:hover {
  background: #0056b3;
}

a {
  color: #007bff;
  text-decoration: none;
}

#loginMessage, #registerMessage {
  color: red;
  text-align: center;
  margin-top: 10px;
}

.button-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}

.btn {
  display: inline-block;
  text-align: center;
  margin: 5px;
  padding: 10px 15px;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.2s ease-in-out;
}

.btn:hover, button:hover {
  background: #0056b3;
}

#attendanceList {
    list-style-type: none;
    padding: 0;
    margin: 10px 0;
}

#attendanceList li {
    background: #f1f1f1;
    margin-bottom: 5px;
    padding: 8px;
    border-radius: 5px;
}

@media (max-width: 600px) {
    .container  {
        margin: 15px;
        padding: 15px;
    }
}

#reader {
    max-width: 100%;
}

.btn.logout {
  background: #dc3545;
}

.btn.logout:hover {
  background: #c82333;
}