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

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

.header {
  background: #2c3e50;
  color: white;
  padding: 1rem 0;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

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

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

.nav h1 {
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  gap: 20px;
}

.nav-links a {
  color: white;
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 4px;
  transition: background-color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
  background-color: #34495e;
}

.main {
  padding: 2rem 0;
}

.card {
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  margin-bottom: 20px;
  padding: 20px;
}

.card h2 {
  margin-bottom: 15px;
  color: #2c3e50;
}

.btn {
  background: #3498db;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: background-color 0.3s;
}

.btn:hover {
  background: #2980b9;
}

.btn-success {
  background: #27ae60;
}

.btn-success:hover {
  background: #229954;
}

.btn-warning {
  background: #f39c12;
}

.btn-warning:hover {
  background: #e67e22;
}

.btn-danger {
  background: #e74c3c;
}

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

.status {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
}

.status-pending {
  background: #fff3cd;
  color: #856404;
}

.status-in-progress {
  background: #d1ecf1;
  color: #0c5460;
}

.status-completed {
  background: #d4edda;
  color: #155724;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
}

.form-group textarea {
  resize: vertical;
  height: 80px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.stat-card {
  background: white;
  padding: 20px;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.stat-number {
  font-size: 2rem;
  font-weight: bold;
  color: #3498db;
}

.stat-label {
  color: #666;
  margin-top: 5px;
}