:root {
  --primary-color: #3498db;
  --primary-dark: #2980b9;
  --secondary-color: #2ecc71;
  --secondary-dark: #27ae60;
  --text-color: #333;
  --light-gray: #f5f5f5;
  --gray: #e0e0e0;
  --dark-gray: #9e9e9e;
  --white: #ffffff;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--light-gray);
  padding: 20px;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
}

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

header h1 {
  font-size: 2.2rem;
  color: var(--primary-dark);
  margin-bottom: 10px;
}

header p {
  color: var(--dark-gray);
  font-size: 1rem;
}

.card {
  background-color: var(--white);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 30px;
  margin-bottom: 30px;
}

.form-section {
  margin-bottom: 25px;
}

.form-section h2 {
  font-size: 1.2rem;
  margin-bottom: 15px;
  color: var(--primary-dark);
  border-bottom: 1px solid var(--gray);
  padding-bottom: 10px;
}

.attendance-type {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
}

.attendance-type label {
  flex: 1;
  border: 2px solid var(--gray);
  border-radius: 6px;
  padding: 15px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
}

.attendance-type input[type="radio"] {
  display: none;
}

.attendance-type input[type="radio"]:checked + label {
  border-color: var(--primary-color);
  background-color: rgba(52, 152, 219, 0.1);
  color: var(--primary-color);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--gray);
  border-radius: 6px;
  font-size: 1rem;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.dropzone {
  border: 2px dashed var(--gray);
  border-radius: 6px;
  padding: 30px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 15px;
}

.dropzone:hover {
  border-color: var(--primary-color);
}

.dropzone p {
  margin-bottom: 10px;
  color: var(--dark-gray);
}

.dropzone-icon {
  font-size: 3rem;
  color: var(--dark-gray);
  margin-bottom: 15px;
}

.image-preview {
  max-width: 300px;
  margin: 15px auto;
  display: none;
}

.image-preview img {
  width: 100%;
  border-radius: 6px;
  box-shadow: var(--shadow);
}

.btn {
  padding: 12px 24px;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-block;
  text-align: center;
}

.btn:hover {
  background-color: var(--primary-dark);
}

.btn:disabled {
  background-color: var(--dark-gray);
  cursor: not-allowed;
}

.btn-block {
  display: block;
  width: 100%;
}

.loader {
  display: none;
  text-align: center;
  margin: 20px 0;
}

.spinner {
  border: 4px solid rgba(0, 0, 0, 0.1);
  border-radius: 50%;
  border-top: 4px solid var(--primary-color);
  width: 30px;
  height: 30px;
  animation: spin 1s linear infinite;
  display: inline-block;
  margin-right: 10px;
  vertical-align: middle;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.alert {
  padding: 15px;
  border-radius: 6px;
  margin-bottom: 20px;
  display: none;
}

.alert-success {
  background-color: rgba(46, 204, 113, 0.2);
  border: 1px solid var(--secondary-color);
  color: var(--secondary-dark);
}

.alert-error {
  background-color: rgba(231, 76, 60, 0.3);
  border: 2px solid #e74c3c;
  color: #c0392b;
  font-weight: bold;
  box-shadow: 0 4px 8px rgba(231, 76, 60, 0.3);
  margin-bottom: 15px;
}

footer {
  text-align: center;
  padding: 20px 0;
  color: var(--dark-gray);
  font-size: 0.9rem;
}

.health-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 10px;
  font-size: 0.9rem;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--secondary-color);
}

/* Responsive design */
@media (max-width: 768px) {
  .container {
    padding: 15px;
  }
  
  .card {
    padding: 20px;
  }
  
  .attendance-type {
    flex-direction: column;
    gap: 10px;
  }
}