* { box-sizing: border-box; }

/* ── Tablet (≤ 900px) ────────────────────────────────────── */
@media screen and (max-width: 900px) {
    .kpi-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

/* ── Mobile (≤ 768px) ────────────────────────────────────── */
@media screen and (max-width: 768px) {
    .app-header {
        flex-direction: column !important;
        align-items: flex-start !important;
        padding: 14px 16px !important;
        gap: 8px;
    }

    .app-nav {
        padding: 0 !important;
        gap: 0 !important;
        overflow-x: unset;
    }
    .app-nav button {
        flex: 1 !important;
        text-align: center !important;
        padding: 10px 6px !important;
        font-size: 11px !important;
        white-space: normal !important;
        line-height: 1.25 !important;
    }

    .page-content {
        padding: 14px 12px !important;
    }

    .chart-row {
        flex-direction: column !important;
    }

    .kpi-card-value {
        font-size: 18px !important;
        white-space: normal !important;
    }
}

/* ── Small mobile (≤ 480px) ──────────────────────────────── */
@media screen and (max-width: 480px) {
    .kpi-grid {
        grid-template-columns: 1fr 1fr !important;
    }

    .kpi-card-value {
        font-size: 15px !important;
    }

    .app-header h1 {
        font-size: 18px !important;
    }
}