body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: #f5f5f5;
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
    monospace;
}

* {
  box-sizing: border-box;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

.card {
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  padding: 30px;
  margin-bottom: 20px;
}

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

.form-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: 600;
  color: #333;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: #007bff;
  box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

.btn {
  background: #007bff;
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 4px;
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.2s;
}

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

.btn:disabled {
  background: #6c757d;
  cursor: not-allowed;
}

.alert {
  padding: 15px;
  border-radius: 4px;
  margin-bottom: 20px;
}

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

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

.result-card {
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 4px;
  padding: 15px;
  margin-top: 15px;
}

.result-card h4 {
  margin: 0 0 10px 0;
  color: #495057;
}

.result-card p {
  margin: 5px 0;
  color: #6c757d;
}

.result-card code {
  background: #e9ecef;
  padding: 2px 4px;
  border-radius: 2px;
  font-size: 14px;
}

.nav-link {
  display: inline-block;
  padding: 10px 16px;
  text-decoration: none;
  color: #666;
  font-size: 14px;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
  margin-bottom: -2px;
}

.nav-link:hover {
  color: #333;
  background-color: #f8f9fa;
}

.nav-link-active {
  color: #b4121b;
  border-bottom-color: #b4121b;
  font-weight: 600;
}