/* Modern CSS Reset and Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: #fafafa;
  color: #333;
  min-height: 100vh;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

/* Custom Styles */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.nav {
  background: white;
  border-bottom: 1px solid #e0e0e0;
  padding: 1rem 0;
  margin-bottom: 2rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: #0070f3;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: #0051a2;
}

.nav-links a.active {
  color: #333;
  font-weight: 600;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: #333;
  text-decoration: none;
}

.card {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  border: 1px solid #e0e0e0;
  margin-bottom: 2rem;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 1rem;
}

.btn-primary {
  background: #0070f3;
  color: white;
}

.btn-primary:hover {
  background: #0051a2;
  transform: translateY(-1px);
}

.btn-secondary {
  background: #6c757d;
  color: white;
}

.btn-secondary:hover {
  background: #545b62;
}

.btn-success {
  background: #28a745;
  color: white;
}

.btn-success:hover {
  background: #1e7e34;
}

.btn-danger {
  background: #dc3545;
  color: white;
}

.btn-danger:hover {
  background: #c82333;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: #333;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: #0070f3;
  box-shadow: 0 0 0 3px rgba(0, 112, 243, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.alert {
  padding: 1rem 1.5rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  border: 1px solid transparent;
}

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

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

.alert-info {
  background: #d1ecf1;
  color: #0c5460;
  border-color: #bee5eb;
}

.search-form {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  align-items: center;
}

.search-input {
  flex: 1;
  max-width: 400px;
}

.user-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.user-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  border: 1px solid #e0e0e0;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.user-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.user-name {
  font-size: 1.25rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 0.5rem;
}

.user-email {
  color: #666;
  margin-bottom: 0.5rem;
}

.user-role {
  display: inline-block;
  background: #e3f2fd;
  color: #1976d2;
  padding: 0.25rem 0.75rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.user-actions {
  display: flex;
  gap: 0.75rem;
}

.user-actions a {
  color: #0070f3;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.875rem;
}

.user-actions a:hover {
  text-decoration: underline;
}

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: #666;
}

.empty-state h3 {
  margin-bottom: 1rem;
  color: #333;
}

.feature-list {
  list-style: none;
  padding: 0;
}

.feature-list li {
  padding: 0.5rem 0;
  position: relative;
  padding-left: 1.5rem;
}

.feature-list li::before {
  content: "✅";
  position: absolute;
  left: 0;
}

.api-endpoints {
  background: #f8f9fa;
  padding: 1rem;
  border-radius: 8px;
  margin-top: 1rem;
}

.api-endpoints code {
  background: #e9ecef;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  .nav-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav-links {
    gap: 1rem;
  }
  
  .search-form {
    flex-direction: column;
    align-items: stretch;
  }
  
  .search-input {
    max-width: none;
  }
  
  .user-grid {
    grid-template-columns: 1fr;
  }
  
  .card-header {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }
}

/* Loading States */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

.spinner {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border: 2px solid #f3f3f3;
  border-top: 2px solid #0070f3;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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