body {
    background-color: #f5f7fa;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
}

.sidebar {
    width: 240px;
    min-height: 100vh;
    background: #fff;
    border-right: 1px solid #e0e4e8;
}

.sidebar .nav-link {
    color: #495057;
    border-radius: 8px;
    margin-bottom: 2px;
    padding: 10px 16px;
    font-size: 14px;
}

.sidebar .nav-link:hover {
    background-color: #f0f2f5;
}

.sidebar .nav-link.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.sidebar hr {
    margin: 12px 0;
}

.main-content {
    padding: 0;
}

.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    margin-bottom: 16px;
}

.card-header {
    background: white;
    border-bottom: 1px solid #f0f0f0;
    border-radius: 12px 12px 0 0 !important;
    padding: 14px 20px;
}

.card-body {
    padding: 20px;
}

.stat-card {
    border-radius: 12px;
    border: none;
}

.stat-card h2 {
    font-weight: 700;
    margin-bottom: 0;
}

.stat-card h6 {
    opacity: 0.9;
    margin-bottom: 8px;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table {
    font-size: 14px;
}

.table th {
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #6c757d;
    border-top: none;
    padding: 10px 12px;
}

.table td {
    padding: 10px 12px;
    vertical-align: middle;
}

.table-hover tbody tr:hover {
    background-color: #f8f9ff;
}

.btn-group-sm .btn {
    padding: 4px 8px;
}

.badge {
    font-weight: 500;
    font-size: 11px;
}

.form-control, .form-select {
    border-radius: 8px;
    border: 1px solid #e0e4e8;
    padding: 10px 14px;
    font-size: 14px;
}

.form-control:focus, .form-select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102,126,234,0.15);
}

.btn {
    border-radius: 8px;
    font-weight: 500;
    font-size: 14px;
    padding: 8px 16px;
}

.btn-sm {
    padding: 5px 12px;
    font-size: 13px;
}

.form-check-input:checked {
    background-color: #667eea;
    border-color: #667eea;
}

.dropdown-menu {
    border-radius: 8px;
    border: 1px solid #e0e4e8;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.modal-content {
    border-radius: 12px;
    border: none;
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.alert {
    border-radius: 8px;
    border: none;
}

@media (max-width: 768px) {
    .sidebar {
        width: 60px;
        padding: 8px !important;
    }

    .sidebar .nav-link span,
    .sidebar .fs-5,
    .sidebar .dropdown strong {
        display: none;
    }

    .sidebar .nav-link {
        text-align: center;
        padding: 10px 8px;
    }

    .sidebar hr {
        margin: 8px 0;
    }
}