:root {
    --pf-radius: 16px;
    --pf-shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
    --pf-card-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
    --pf-sidebar-bg: #0b1220;
    --pf-sidebar-border: rgba(148, 163, 184, 0.16);
    --pf-surface: #ffffff;
    --pf-surface-muted: #f1f5f9;
    --pf-title: #0f172a;
    --pf-subtitle: #64748b;
}

body {
    background: radial-gradient(circle at top, #e0f2fe 0%, #eef2f6 40%, #ffffff 100%);
}

.app-shell {
    background: transparent;
}

.sidebar {
    background: linear-gradient(180deg, #0b1220 0%, #111827 100%);
    border-right: 1px solid var(--pf-sidebar-border);
}

.sidebar .nav-link {
    padding: 0.55rem 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar .nav-link.active {
    background: rgba(59, 130, 246, 0.16);
    border-left: 3px solid #38bdf8;
    padding-left: calc(0.9rem - 3px);
}

.sidebar .nav-link:hover {
    background: rgba(148, 163, 184, 0.15);
}

.sidebar .nav-section {
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    color: rgba(148, 163, 184, 0.7);
    margin-top: 1.2rem;
    margin-bottom: 0.35rem;
}

.topbar {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
}

.topbar .input-group {
    background: var(--pf-surface-muted);
    border-radius: 999px;
    overflow: hidden;
}

.topbar .input-group .input-group-text {
    background: transparent;
    border: none;
    color: var(--pf-subtitle);
    padding-left: 1rem;
}

.topbar .input-group .form-control {
    border: none;
    background: transparent;
    padding-right: 1rem;
}

.topbar .input-group .form-control:focus {
    box-shadow: none;
}

.page-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--pf-title);
}

.page-subtitle {
    color: var(--pf-subtitle);
}

.kpi-card {
    border-radius: var(--pf-radius);
    box-shadow: var(--pf-card-shadow);
    background: var(--pf-surface);
    border: none;
    overflow: hidden;
}

.kpi-accent {
    height: 4px;
}

.kpi-value {
    font-size: 2rem;
    font-weight: 700;
}

.kpi-label {
    color: var(--pf-subtitle);
    font-weight: 500;
}

.kpi-warning .kpi-accent {
    background: #f59e0b;
}

.kpi-primary .kpi-accent {
    background: #3b82f6;
}

.kpi-danger .kpi-accent {
    background: #ef4444;
}

.kpi-success .kpi-accent {
    background: #22c55e;
}

.table thead th {
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    color: var(--pf-subtitle);
}

.table-hover tbody tr:hover {
    background-color: rgba(59, 130, 246, 0.08);
}

.btn {
    border-radius: 999px;
}

.card {
    border-radius: var(--pf-radius);
}

.card-header,
.card-body {
    border-color: rgba(148, 163, 184, 0.2);
}

.avatar-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
}

.avatar-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(59, 130, 246, 0.2);
    color: #3b82f6;
    display: grid;
    place-items: center;
    font-weight: 700;
    font-size: 0.85rem;
}

.id-tag {
    font-weight: 500;
    color: var(--bs-secondary-color);
    letter-spacing: 0.03em;
    text-decoration: none;
}

.id-tag:link,
.id-tag:visited {
    color: var(--bs-secondary-color);
}

.id-tag:hover {
    text-decoration: underline;
    color: var(--bs-secondary-color);
}