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

body {
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  background: white;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  overflow: hidden;
}

.tabs {
  display: flex;
  background: #f8f9fa;
  border-bottom: 2px solid #e9ecef;
}

.tab {
  flex: 1;
  padding: 15px 20px;
  text-align: center;
  background: #f8f9fa;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  color: #495057;
  font-weight: 500;
}

.tab:hover {
  background: #e9ecef;
}

.tab.active {
  background: #007bff;
  color: white;
}

.content {
  padding: 40px;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

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

label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
  color: #333;
}

input[type="text"],
input[type="password"],
input[type="email"] {
  width: 100%;
  padding: 12px;
  border: 2px solid #ddd;
  border-radius: 5px;
  font-size: 16px;
  transition: border-color 0.3s ease;
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus {
  outline: none;
  border-color: #007bff;
}

button {
  background: #007bff;
  color: white;
  padding: 12px 30px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  transition: background 0.3s ease;
}

button:hover {
  background: #0056b3;
}

.alert {
  padding: 15px;
  margin-bottom: 20px;
  border-radius: 5px;
  font-weight: bold;
}

.alert.success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.alert.error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

.about-section {
  line-height: 1.6;
  color: #333;
}

.about-section h2 {
  color: #007bff;
  margin-bottom: 15px;
}

.about-section p {
  margin-bottom: 15px;
  text-align: justify;
}

#xhr-message,
#fetch-message {
  margin-top: 15px;
}

.security-section {
  margin-bottom: 30px;
  padding: 20px;
  border: 1px solid #ddd;
  border-radius: 8px;
  background: #f8f9fa;
}

.security-section h3 {
  color: #007bff;
  margin-bottom: 10px;
}

.security-section p {
  margin-bottom: 15px;
  color: #666;
}

.result-box {
  background: #ffffff;
  border: 1px solid #ddd;
  border-radius: 5px;
  padding: 15px;
  margin-top: 15px;
  font-family: "Courier New", monospace;
  font-size: 12px;
  max-height: 300px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.result-box.success {
  border-color: #28a745;
  background: #f8fff9;
}

.result-box.error {
  border-color: #dc3545;
  background: #fff8f8;
  color: #dc3545;
}

.hash-display {
  background: #e9ecef;
  border: 1px solid #ced4da;
  border-radius: 4px;
  padding: 10px;
  font-family: "Courier New", monospace;
  font-size: 14px;
  word-break: break-all;
  margin-top: 10px;
}

.fingerprint-summary {
  background: #fff3cd;
  border: 1px solid #ffeaa7;
  border-radius: 4px;
  padding: 15px;
  margin-top: 10px;
}

.fingerprint-hash {
  font-size: 18px;
  font-weight: bold;
  color: #856404;
  font-family: "Courier New", monospace;
}

.loading {
  color: #007bff;
  font-style: italic;
}