/* ============================================================
   RESPONSIVE — Media queries for all breakpoints
   ============================================================ */

/* --- Tablet (max-width: 1024px) --- */
@media (max-width: 1024px) {
    :root {
        --text-6xl: 2.75rem;
        --text-5xl: 2.25rem;
        --text-4xl: 1.875rem;
    }

    .grid--4 { grid-template-columns: repeat(2, 1fr); }
    .grid--3 { grid-template-columns: repeat(2, 1fr); }

    .footer__grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-8);
    }

    .painting-detail__grid {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }

    .painting-detail__info {
        position: static;
    }

    .cart-layout {
        grid-template-columns: 1fr;
    }

    .cart-summary {
        position: static;
    }

    .about-artist {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }

    .usp-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Admin */
    .admin-layout__sidebar {
        width: 240px;
    }

    .admin-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* --- Mobile Large (max-width: 768px) --- */
@media (max-width: 768px) {
    :root {
        --text-6xl: 2.25rem;
        --text-5xl: 1.875rem;
        --text-4xl: 1.5rem;
        --text-3xl: 1.25rem;
        --header-height: 64px;
    }

    .container {
        padding: 0 var(--space-4);
    }

    .section {
        padding: var(--space-12) 0;
    }

    /* Header mobile */
    .header__mobile-toggle {
        display: flex;
    }

    .header__nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-bg);
        flex-direction: column;
        align-items: stretch;
        padding: var(--space-8);
        gap: var(--space-2);
        transform: translateX(100%);
        transition: transform var(--transition-base);
    }

    .header__nav.open {
        transform: translateX(0);
    }

    .header__nav-link {
        padding: var(--space-4);
        font-size: var(--text-lg);
        border-bottom: 1px solid var(--color-border-light);
    }

    .header__nav-link::after {
        display: none;
    }

    /* Hero mobile */
    .hero {
        min-height: 80vh;
    }

    .hero__title {
        font-size: var(--text-4xl);
    }

    .hero__actions {
        flex-direction: column;
    }

    .hero__actions .btn {
        width: 100%;
    }

    .hero__scroll-indicator {
        display: none;
    }

    /* Grid mobile */
    .grid--2,
    .grid--3,
    .grid--4 {
        grid-template-columns: 1fr;
    }

    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: var(--space-5);
    }

    .gallery-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .gallery-controls__search {
        max-width: 100%;
    }

    .gallery-controls__filters {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: var(--space-2);
    }

    .gallery-controls__filter-btn {
        white-space: nowrap;
    }

    /* Cart mobile */
    .cart-item {
        grid-template-columns: 80px 1fr;
        gap: var(--space-3);
    }

    .cart-item__actions {
        grid-column: 1 / -1;
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }

    /* Footer mobile */
    .footer__grid {
        grid-template-columns: 1fr;
    }

    .footer__bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }

    /* Painting detail mobile */
    .painting-detail__specs {
        grid-template-columns: 1fr;
    }

    .painting-detail__actions {
        flex-direction: column;
    }

    .painting-detail__actions .btn {
        width: 100%;
    }

    /* USP mobile */
    .usp-grid {
        grid-template-columns: 1fr;
    }

    /* Login */
    .login-card {
        padding: var(--space-6);
    }

    /* Admin mobile */
    .admin-layout__sidebar {
        position: fixed;
        left: -280px;
        top: var(--header-height);
        bottom: 0;
        width: 280px;
        z-index: 500;
        transition: left var(--transition-base);
        box-shadow: var(--shadow-xl);
    }

    .admin-layout__sidebar.open {
        left: 0;
    }

    .admin-layout__main {
        margin-left: 0;
    }

    .admin-mobile-toggle {
        display: flex;
    }

    .admin-stats {
        grid-template-columns: 1fr;
    }

    .admin-table {
        font-size: var(--text-sm);
    }

    .admin-table th,
    .admin-table td {
        padding: var(--space-2) var(--space-3);
    }

    /* Hide non-essential columns on mobile */
    .admin-table .hide-mobile {
        display: none;
    }
}

/* --- Mobile Small (max-width: 480px) --- */
@media (max-width: 480px) {
    :root {
        --text-6xl: 1.875rem;
        --text-5xl: 1.5rem;
    }

    .hero {
        min-height: 70vh;
    }

    .gallery-grid {
        grid-template-columns: 1fr;
    }

    .btn--lg {
        padding: var(--space-4) var(--space-6);
        font-size: var(--text-sm);
    }

    .page-hero {
        padding: var(--space-10) 0 var(--space-8);
    }

    .toast {
        min-width: 260px;
        max-width: calc(100vw - 32px);
    }
}