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

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

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

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.user-info {
    color: #ecf0f1;
}

.container {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    min-height: calc(100vh - 70px);
}

.sidebar {
    width: 250px;
    background: white;
    padding: 2rem 0;
    box-shadow: 2px 0 4px rgba(0,0,0,0.05);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
}

.nav-item {
    padding: 1rem 2rem;
    color: #555;
    text-decoration: none;
    transition: all 0.3s;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: #f8f9fa;
    color: #2c3e50;
}

.nav-item.active {
    background: #e8f4f8;
    color: #2c3e50;
    border-left-color: #3498db;
    font-weight: 600;
}

.main-content {
    flex: 1;
    padding: 2rem;
}

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

.page-header h1 {
    font-size: 2rem;
    color: #2c3e50;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-icon {
    font-size: 2.5rem;
}

.stat-info h3 {
    font-size: 2rem;
    color: #2c3e50;
    margin-bottom: 0.25rem;
}

.stat-info p {
    color: #7f8c8d;
    font-size: 0.9rem;
}

.table-container {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    overflow: hidden;
    margin-bottom: 2rem;
}

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

.data-table thead {
    background: #34495e;
    color: white;
}

.data-table th,
.data-table td {
    padding: 1rem;
    text-align: left;
}

.data-table tbody tr {
    border-bottom: 1px solid #ecf0f1;
}

.data-table tbody tr:hover {
    background: #f8f9fa;
}

.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

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

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

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

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

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

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

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

.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.85rem;
}

.btn-block {
    width: 100%;
    display: block;
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.badge-success {
    background: #d4edda;
    color: #155724;
}

.badge-danger {
    background: #f8d7da;
    color: #721c24;
}

.badge-warning {
    background: #fff3cd;
    color: #856404;
}

.badge-secondary {
    background: #e2e3e5;
    color: #383d41;
}

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

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

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

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    overflow: auto;
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 2rem;
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 20px;
}

.close:hover,
.close:focus {
    color: #000;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #2c3e50;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group input[type="number"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.form-group input[type="checkbox"] {
    margin-right: 0.5rem;
}

.login-page {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 1rem;
}

.login-card {
    background: white;
    padding: 2.5rem;
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.login-card h1 {
    text-align: center;
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.login-card h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #7f8c8d;
    font-size: 1.2rem;
}

.search-form {
    display: flex;
    gap: 0.5rem;
}

.search-form input {
    flex: 1;
    padding: 0.5rem 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.info-box {
    background: #e8f4f8;
    border-left: 4px solid #3498db;
    padding: 1rem;
    margin-bottom: 2rem;
    border-radius: 4px;
}

.info-box h3 {
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.info-box p {
    margin: 0.25rem 0;
    color: #555;
}

.dashboard-charts {
    margin: 2rem 0;
}

.chart-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.chart-card h2 {
    margin-bottom: 1rem;
    color: #2c3e50;
}

.chart-container {
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    height: 200px;
    padding: 1rem;
}

.chart-bar {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.bar {
    background: #3498db;
    width: 40px;
    border-radius: 4px 4px 0 0;
    transition: all 0.3s;
}

.bar-label {
    font-size: 0.8rem;
    color: #7f8c8d;
}

.bar-value {
    font-weight: bold;
    color: #2c3e50;
}

.recent-activity {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    margin-top: 2rem;
}

.recent-activity h2 {
    margin-bottom: 1rem;
    color: #2c3e50;
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.activity-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    background: #f8f9fa;
    border-radius: 4px;
}

.activity-icon {
    font-size: 1.5rem;
}

.activity-info {
    flex: 1;
}

.activity-time {
    color: #7f8c8d;
    font-size: 0.85rem;
}

.error-details {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    max-height: 200px;
    overflow-y: auto;
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .page-header {
        flex-direction: column;
        gap: 1rem;
    }
}