:root {
    --pd-primary: #1e3a8a;
    --pd-primary-dark: #1e40af;
    --pd-accent: #0891b2;
    --pd-accent-light: #06b6d4;
    --pd-success: #059669;
    --pd-danger: #dc2626;
    --pd-warning: #f59e0b;
    --pd-gray-50: #f9fafb;
    --pd-gray-100: #f3f4f6;
    --pd-gray-800: #1f2937;
    --pd-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --pd-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --pd-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

/* Navbar Enhancements */
.navbar-dark.bg-dark {
    background: linear-gradient(135deg, var(--pd-primary) 0%, var(--pd-primary-dark) 100%) !important;
    box-shadow: var(--pd-shadow-md);
}

.navbar-brand {
    font-weight: 600;
    font-size: 1.25rem;
    letter-spacing: -0.025em;
}

.navbar-brand .brand-accent {
    color: var(--pd-accent-light);
    font-weight: 700;
}

/* Card Enhancements */
.card {
    border: none;
    box-shadow: var(--pd-shadow);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: var(--pd-shadow-lg);
    transform: translateY(-2px);
}

.card-header {
    background: linear-gradient(135deg, var(--pd-gray-50) 0%, white 100%);
    border-bottom: 2px solid var(--pd-primary);
    font-weight: 600;
}

/* Button Enhancements */
.btn-primary {
    background: linear-gradient(135deg, var(--pd-primary) 0%, var(--pd-primary-dark) 100%);
    border: none;
    box-shadow: var(--pd-shadow);
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--pd-primary-dark) 0%, var(--pd-primary) 100%);
    box-shadow: var(--pd-shadow-md);
    transform: translateY(-1px);
}

.btn-outline-secondary {
    border-color: var(--pd-gray-800);
    color: var(--pd-gray-800);
    transition: all 0.3s ease;
}

.btn-outline-secondary:hover {
    background-color: var(--pd-gray-800);
    border-color: var(--pd-gray-800);
    transform: translateY(-1px);
}

/* Table Enhancements */
.table-hover tbody tr {
    transition: all 0.2s ease;
}

.table-hover tbody tr:hover {
    background-color: var(--pd-gray-50);
    transform: scale(1.01);
}

.table-light {
    background: linear-gradient(135deg, var(--pd-gray-50) 0%, white 100%);
}

/* Badge Enhancements */
.badge {
    padding: 0.35em 0.65em;
    font-weight: 500;
    box-shadow: var(--pd-shadow);
}

/* Alert Enhancements */
.alert {
    border: none;
    box-shadow: var(--pd-shadow);
    border-left: 4px solid;
}

.alert-success {
    border-left-color: var(--pd-success);
}

.alert-danger {
    border-left-color: var(--pd-danger);
}

.alert-info {
    border-left-color: var(--pd-accent);
}

/* Form Enhancements */
.form-control:focus {
    border-color: var(--pd-accent);
    box-shadow: 0 0 0 0.2rem rgba(8, 145, 178, 0.25);
}

.form-label {
    font-weight: 500;
    color: var(--pd-gray-800);
}

/* Stats Cards */
.stat-card {
    border-left: 4px solid var(--pd-accent);
}

/* Loading State */
.btn.loading {
    position: relative;
    color: transparent;
}

.btn.loading::after {
    content: "";
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 0.6s linear infinite;
}

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

/* Page Header */
.border-bottom {
    border-bottom-color: var(--pd-gray-100) !important;
}

/* Container Spacing */
.container {
    padding-top: 1rem;
    padding-bottom: 2rem;
}

/* Code Blocks */
code {
    background-color: var(--pd-gray-100);
    padding: 0.2em 0.4em;
    border-radius: 0.25rem;
    font-size: 0.875em;
}

pre code {
    background-color: transparent;
    padding: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1rem;
    }

    .card:hover {
        transform: none;
    }
}