:root {
    --primary-blue: #4a90e2;
    --light-blue: #e3f2fd;
    --secondary-blue: #1976d2;
    --dark-blue: #1565c0;
    --success-green: #4caf50;
    --warning-orange: #ff9800;
    --danger-red: #f44336;
}

body {
    background-color: #f8f9fa;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.sidebar {
    background: linear-gradient(180deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    min-height: 100vh;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}

.sidebar .nav-link {
    color: white;
    padding: 12px 20px;
    margin: 5px 10px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.sidebar .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateX(5px);
}

.sidebar .nav-link.active {
    background-color: white;
    color: var(--primary-blue);
    font-weight: 600;
}

.sidebar-header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
    margin-bottom: 20px;
}

.card:hover {
    transform: translateY(-5px);
}

.card-primary {
    border-top: 4px solid var(--primary-blue);
}

.card-success {
    border-top: 4px solid var(--success-green);
}

.card-warning {
    border-top: 4px solid var(--warning-orange);
}

.stat-card .card-body {
    padding: 25px;
}

.stat-icon {
    font-size: 2.5rem;
    opacity: 0.8;
}

.btn-primary {
    background-color: var(--primary-blue);
    border-color: var(--primary-blue);
}

.btn-primary:hover {
    background-color: var(--secondary-blue);
    border-color: var(--secondary-blue);
}

.btn-outline-primary {
    color: var(--primary-blue);
    border-color: var(--primary-blue);
}

.btn-outline-primary:hover {
    background-color: var(--primary-blue);
    border-color: var(--primary-blue);
}

.table th {
    background-color: var(--light-blue);
    border-top: none;
    font-weight: 600;
    color: var(--dark-blue);
}

.pagination .page-link {
    color: var(--primary-blue);
}

.pagination .page-item.active .page-link {
    background-color: var(--primary-blue);
    border-color: var(--primary-blue);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 0.25rem rgba(74, 144, 226, 0.25);
}

.modal-header {
    background-color: var(--light-blue);
    color: var(--dark-blue);
}

.badge-success {
    background-color: var(--success-green);
}

.badge-warning {
    background-color: var(--warning-orange);
}

.badge-primary {
    background-color: var(--primary-blue);
}

.search-box {
    max-width: 300px;
}

@media (max-width: 768px) {
    .sidebar {
        min-height: auto;
        position: static;
    }
    .stat-card .card-body {
        padding: 15px;
    }
    .search-box {
        max-width: 100%;
        margin-bottom: 15px;
    }
}