/* ========================================== */
/* RESPONSIVE: MOBILE PORTRAIT                */
/* ========================================== */
@media (max-width: 767px) {
    .app-container {
        grid-template-columns: 1fr;
        grid-template-areas:
            "header"
            "main";
    }
    
    .sidebar {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        height: calc(100vh - 60px);
        height: calc(100dvh - 60px);
        width: 250px;
        z-index: 150;
        box-shadow: var(--shadow-modal);
    }

    .sidebar.sidebar--open {
        display: block;
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.4);
        z-index: 140;
    }

    .sidebar-overlay--visible {
        display: block;
    }
    
    .main-content {
        padding: var(--space-base);
    }
    
    .dashboard__row-split {
        grid-template-columns: 1fr;
    }
}

/* ========================================== */
/* RESPONSIVE: TABLET PORTRAIT                */
/* ========================================== */
@media (min-width: 768px) and (max-width: 1023px) {
    /* FILLED: Tablet portrait adaptations */
    .app-container {
        grid-template-columns: 80px 1fr; /* Collapsed sidebar */
    }
    
    .dashboard__row-split {
        grid-template-columns: 1fr 1fr;
    }

    .sidebar__nav-item a span {
        display: none; /* Hide text, show only icons */
    }
}

/* ========================================== */
/* RESPONSIVE: TABLET LANDSCAPE (PRIMARY)     */
/* ========================================== */
@media (min-width: 1024px) and (max-width: 1365px) {
    /* FILLED: Tablet landscape adaptations */
    .app-container {
        grid-template-columns: 250px 1fr;
    }
    
    .dashboard__row-split {
        grid-template-columns: 2fr 1fr;
    }
    
    .main-content {
        padding: var(--space-xl);
    }
}

/* ========================================== */
/* RESPONSIVE: DESKTOP                        */
/* ========================================== */
@media (min-width: 1366px) {
    /* FILLED: Desktop adaptations */
    .page {
        max-width: 1600px;
        margin: 0 auto;
    }
    
    .dashboard__row-split {
        grid-template-columns: 2fr 1fr;
    }
}