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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
}

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

.card {
  background: white;
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  margin-bottom: 20px;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}

.header h1 {
  color: #333;
  font-size: 28px;
}

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.3s;
}

.btn-primary {
  background: #667eea;
  color: white;
}

.btn-primary:hover {
  background: #5568d3;
}

.btn-danger {
  background: #f56565;
  color: white;
}

.btn-danger:hover {
  background: #e53e3e;
}

.btn-success {
  background: #48bb78;
  color: white;
}

.btn-success:hover {
  background: #38a169;
}

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

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: #333;
  font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 14px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #667eea;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th,
.table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid #eee;
}

.table th {
  background: #f7fafc;
  font-weight: 600;
  color: #333;
}

.table tr:hover {
  background: #f7fafc;
}

.message {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 15px 20px;
  border-radius: 6px;
  color: white;
  z-index: 1000;
  animation: slideIn 0.3s;
}

.message-info {
  background: #4299e1;
}

.message-success {
  background: #48bb78;
}

.message-error {
  background: #f56565;
}

@keyframes slideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}

.badge-success {
  background: #c6f6d5;
  color: #22543d;
}

.badge-danger {
  background: #fed7d7;
  color: #742a2a;
}

.badge-warning {
  background: #feebc8;
  color: #7c2d12;
}

.badge-info {
  background: #bee3f8;
  color: #2c5282;
}

.announcement {
  background: #fef5e7;
  border-left: 4px solid #f39c12;
  padding: 15px;
  margin-bottom: 20px;
  border-radius: 6px;
}

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

.stat-card {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 20px;
  border-radius: 12px;
  text-align: center;
}

.stat-card h3 {
  font-size: 36px;
  margin-bottom: 10px;
}

.stat-card p {
  opacity: 0.9;
}

.nav {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.nav a {
  padding: 10px 20px;
  background: white;
  color: #667eea;
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.3s;
}

.nav a:hover,
.nav a.active {
  background: #667eea;
  color: white;
}