:root {
    --sidebar-width: 250px;
    --sidebar-bg: #1a2332;
    --sidebar-hover: #2a3a52;
    --primary: #2c6bff;
    --primary-light: #e8eeff;
    --secondary: #6b7280;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --bg: #f3f4f6;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --border: #e5e7eb;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg);
    font-size: 0.875rem;
    color: #1f2937;
}

.sidebar {
    background: linear-gradient(180deg, #1a2332 0%, #0f172a 100%) !important;
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    z-index: 100;
    overflow-y: auto;
}

.sidebar .nav-link {
    border-radius: 6px;
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
    color: rgba(255,255,255,0.7) !important;
    transition: all 0.15s ease;
    margin-bottom: 1px;
}

.sidebar .nav-link:hover {
    background-color: var(--sidebar-hover);
    color: #fff !important;
}

.sidebar .nav-link.active {
    background-color: var(--primary);
    color: #fff !important;
}

.sidebar .collapse .nav-link {
    padding-left: 1.5rem;
    font-size: 0.8rem;
}

.navbar-top {
    background: #fff !important;
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    height: 56px;
}

.card {
    border: 1px solid var(--border);
    box-shadow: var(--card-shadow);
    border-radius: 8px;
}

.card-header {
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.25rem;
    font-weight: 600;
    font-size: 0.9375rem;
    border-radius: 8px 8px 0 0 !important;
}

.table {
    margin-bottom: 0;
}

.table th {
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--secondary);
    background: #f9fafb;
    border-bottom: 2px solid var(--border);
    padding: 0.75rem !important;
}

.table td {
    padding: 0.65rem 0.75rem !important;
    vertical-align: middle;
    border-bottom: 1px solid #f3f4f6;
}

.table tr:hover td {
    background-color: #f9fafb;
}

.btn-sm {
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
    border-radius: 4px;
}

.btn-primary { background-color: var(--primary); border-color: var(--primary); }
.btn-success { background-color: var(--success); border-color: var(--success); }
.btn-warning { background-color: var(--warning); border-color: var(--warning); }
.btn-danger { background-color: var(--danger); border-color: var(--danger); }
.btn-info { background-color: var(--info); border-color: var(--info); }

.badge {
    font-weight: 500;
    padding: 0.3em 0.65em;
    font-size: 0.75rem;
    border-radius: 4px;
}

.form-label {
    font-weight: 500;
    font-size: 0.8125rem;
    margin-bottom: 0.3rem;
    color: #374151;
}

.form-control, .form-select {
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.875rem;
    padding: 0.45rem 0.75rem;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(44,107,255,0.1);
}

.modal-header {
    background: #f9fafb;
    border-bottom: 1px solid var(--border);
    border-radius: 8px 8px 0 0;
    padding: 1rem 1.25rem;
}

.modal-content {
    border: none;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    border-radius: 8px;
}

.alert {
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
}

.main-content {
    margin-left: 250px;
    min-height: 100vh;
    width: calc(100% - 250px);
}

.kpi-card {
    transition: all 0.2s ease;
    border: 1px solid var(--border);
}

.kpi-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.loading {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    border: 3px solid #e5e7eb;
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.list-group-item {
    border: 1px solid var(--border);
    font-size: 0.875rem;
}

.nav-tabs .nav-link {
    font-size: 0.875rem;
    color: var(--secondary);
}

.nav-tabs .nav-link.active {
    font-weight: 600;
    color: var(--primary);
    border-bottom-color: var(--primary);
}

@media print {
    .sidebar, .navbar-top, .btn { display: none !important; }
    .main-content { margin-left: 0 !important; padding-top: 0 !important; }
}