:root {
    --brand: #2563eb;
}
body { background: #f4f6fa; }
.login-body { min-height: 100vh; background: linear-gradient(135deg,#1e3a8a,#2563eb); }
.login-card { width: 100%; max-width: 400px; border: none; border-radius: 14px; }

.topbar { position: sticky; top: 0; z-index: 1000; }

.sidebar {
    width: 230px;
    min-height: calc(100vh - 56px);
    background: #111827;
    flex-shrink: 0;
}
.sidebar .nav-link {
    color: #cbd5e1;
    padding: 10px 20px;
    font-size: 14.5px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.sidebar .nav-link:hover { background: #1f2937; color: #fff; }
.sidebar .nav-link.active { background: var(--brand); color: #fff; }
.sidebar .nav-group-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px 6px;
    cursor: pointer;
    text-decoration: none;
}
.sidebar .nav-group-label {
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: #6b7280;
}
.sidebar .nav-group-toggle:hover .nav-group-label { color: #9ca3af; }
.sidebar .nav-group-toggle .chevron {
    font-size: 11px;
    color: #6b7280;
    transition: transform .2s ease;
}
.sidebar .nav-group-toggle.collapsed .chevron { transform: rotate(-90deg); }
.sidebar .nav-item:first-child .nav-group-toggle { padding-top: 4px; }

.main-content { min-height: calc(100vh - 56px); }

.stat-card {
    border: none;
    border-radius: 12px;
    color: #fff;
}
.stat-card .icon { font-size: 28px; opacity: .85; }

.card { border-radius: 12px; border: 1px solid #e5e7eb; }
.table thead { background: #f1f5f9; }

@media (max-width: 991px) {
    .sidebar { position: fixed; left: -230px; top: 56px; transition: left .2s; z-index: 999; }
    .sidebar.show { left: 0; }
}