:root {
    --sidebar-bg: #101827;
    --sidebar-muted: #91a0b5;
    --page-bg: #edf2f8;
    --card-shadow: 0 24px 50px rgba(15, 23, 42, 0.08);
    --brand: #1f5eff;
}

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: radial-gradient(circle at top left, #f8fbff, #edf2f8 48%, #e4ebf5 100%);
    color: #1f2937;
}

.portal-body {
    background-color: var(--page-bg);
}

.legacy-surface {
    background: linear-gradient(180deg, #f7f6f1 0%, #ece7de 100%);
}

.sidebar {
    width: 280px;
    background: linear-gradient(180deg, #101827 0%, #0c1220 100%);
    min-height: 100vh;
}

.sidebar .nav-link {
    color: #d8dfeb;
    border-radius: 0.75rem;
    padding: 0.7rem 0.9rem;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
}

.topbar {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
}

.page-shell {
    padding: 2rem;
}

.public-shell {
    padding: 1.5rem;
}

.footer-note {
    background: rgba(255, 255, 255, 0.8);
}

.logo-mark {
    width: 58px;
    height: 58px;
    border-radius: 16px;
    background: linear-gradient(135deg, #0f172a, #1f5eff);
    display: grid;
    place-items: center;
    color: #fff;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.login-card {
    border-radius: 1.5rem;
}

.tracking {
    letter-spacing: 0.08em;
}

.stat-card,
.legacy-card,
.card {
    box-shadow: var(--card-shadow);
    border-radius: 1rem;
}

.tier-badge {
    background: #e0eaff;
    color: #17377a;
}

.old-table {
    font-size: 0.95rem;
}

@media (max-width: 991.98px) {
    .sidebar {
        width: 240px;
    }

    .page-shell {
        padding: 1.25rem;
    }
}

@media (max-width: 767.98px) {
    .sidebar {
        display: none;
    }

    .public-shell,
    .page-shell {
        padding: 1rem;
    }
}