/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f5f5f5;
}

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

/* Navigation */
.nav {
  background-color: #2c3e50;
  padding: 1rem 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

.nav-brand {
  color: white;
  text-decoration: none;
  font-size: 1.5rem;
  font-weight: bold;
}

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

.nav-link {
  color: white;
  text-decoration: none;
  padding: 0.5rem 1rem;
  transition: color 0.3s ease;
}

.nav-link:hover {
  color: #3498db;
}

/* Main Content */
.main-content {
  padding: 2rem 0;
}

/* Cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.card {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Headers */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.title {
  font-size: 2rem;
  color: #2c3e50;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: background-color 0.3s ease;
}

.btn-primary {
  background-color: #3498db;
  color: white;
}

.btn-primary:hover {
  background-color: #2980b9;
}

.btn-warning {
  background-color: #f1c40f;
  color: #2c3e50;
}

.btn-warning:hover {
  background-color: #f39c12;
}

.btn-danger {
  background-color: #e74c3c;
  color: white;
}

.btn-danger:hover {
  background-color: #c0392b;
}

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

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  color: #2c3e50;
  font-weight: 500;
}

.form-input {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 1rem;
}

.form-input:focus {
  outline: none;
  border-color: #3498db;
}

/* Status Badges */
.badge {
  padding: 0.3rem 0.6rem;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
}

.badge-success {
  background-color: #2ecc71;
  color: white;
}

.badge-danger {
  background-color: #e74c3c;
  color: white;
}

/* Card Actions */
.card-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

/* Utilities */
.text-truncate {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mt-1 { margin-top: 1rem; }
.mb-1 { margin-bottom: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-2 { margin-bottom: 2rem; }

/* Alert Messages */
.alert {
  padding: 1rem;
  border-radius: 4px;
  margin-bottom: 1rem;
}

.alert-info {
  background-color: #d1ecf1;
  color: #0c5460;
  border: 1px solid #bee5eb;
}

/* Responsive Design */
@media (max-width: 768px) {
  .grid {
    grid-template-columns: 1fr;
  }
  
  .header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .nav-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav-links {
    flex-direction: column;
    align-items: center;
  }
}