/* ─── Responsive: Desktop ─── */
@media (max-width: 1280px) {
  .footer__grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: var(--space-xl);
  }

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

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

/* ─── Responsive: Tablet Landscape ─── */
@media (max-width: 1024px) {
  :root {
    --header-height: 60px;
    --container-padding: 1.5rem;
  }

  /* Header: hide nav, show hamburger */
  .header__nav {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    padding: var(--space-lg);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    z-index: var(--z-overlay);
    overflow-y: auto;
  }

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

  .nav-menu {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-menu > li > a {
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
    font-size: var(--text-base);
  }

  .sub-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding-left: var(--space-lg);
  }

  .mobile-menu-toggle {
    display: block;
  }

  /* Hero */
  .hero {
    min-height: 420px;
  }

  .hero__title {
    font-size: 2rem;
  }

  .hero__product-card {
    display: none;
  }

  /* Tech */
  .tech__top {
    flex-direction: column;
    gap: var(--space-xl);
  }

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

  /* Featured product */
  .featured-product__frame {
    padding: 1.5rem;
    margin-top: 2rem;
  }

  .featured-product__inner {
    grid-template-columns: 1fr;
  }

  .featured-product__specs {
    grid-template-columns: 1fr 1fr;
  }

  /* USP */
  .usp-tabs__content {
    gap: var(--space-xl);
    padding: var(--space-xl);
  }

  .usp-tabs__title {
    font-size: var(--text-3xl);
  }

  /* Products */
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  /* Testimonials */
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .testimonials-grid .testimonial-card:last-child {
    grid-column: 1 / -1;
  }

  /* Reviews */
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .reviews-grid .review-card:last-child {
    grid-column: 1 / -1;
  }

  /* Dealers */
  .dealers-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Footer */
  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }

  /* Content area */
  .content-area {
    grid-template-columns: 1fr;
  }

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

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

/* ─── Responsive: Tablet Portrait ─── */
@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
    --space-3xl: 2.5rem;
  }

  .hero {
    min-height: 360px;
  }

  .hero__title {
    font-size: 1.75rem;
  }

  /* USP */
  .usp__heading {
    font-size: var(--text-2xl);
  }

  .usp-tabs__content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    padding: var(--space-lg);
  }

  .usp-tabs__title {
    font-size: var(--text-2xl);
  }

  .usp-tabs__image {
    order: -1;
  }

  .usp-tabs__nav {
    padding: var(--space-sm) var(--space-md);
  }

  .usp-tabs__btn {
    padding: 0.5rem 1rem;
    font-size: var(--text-xs);
  }

  /* Comparison */
  .comparison {
    flex-direction: column;
    min-height: 480px;
  }

  .comparison__side {
    flex: 1;
  }

  .comparison__divider {
    left: 0;
    right: 0;
    top: 50%;
    bottom: auto;
    width: 100%;
    height: 3px;
    flex-direction: row;
    transform: translateY(-50%);
  }

  /* Featured product */
  .featured-product__specs {
    grid-template-columns: 1fr;
  }

  /* Products compact */
  .products-grid--compact {
    grid-template-columns: 1fr;
  }

  .product-card--horizontal {
    grid-template-columns: 120px 1fr;
  }

  /* Testimonials */
  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .testimonials-grid .testimonial-card:last-child {
    grid-column: auto;
  }

  /* Reviews */
  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .reviews-grid .review-card:last-child {
    grid-column: auto;
  }

  /* Dealers */
  .dealers-grid {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

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

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

  .post__title {
    font-size: var(--text-2xl);
  }

  .post__content {
    font-size: var(--text-base);
  }
}

/* ─── Responsive: Phone ─── */
@media (max-width: 480px) {
  :root {
    --space-3xl: 2rem;
    --container-padding: 0.75rem;
  }

  .site-logo-text {
    font-size: var(--text-xl);
  }

  .logo-tagline {
    display: none;
  }

  .hero {
    min-height: 300px;
  }

  .hero__title {
    font-size: 1.5rem;
  }

  .hero__actions .btn {
    font-size: var(--text-sm);
    padding: 0.625rem 1.5rem;
  }

  /* Tech */
  .tech__features {
    grid-template-columns: 1fr;
  }

  /* Products */
  .products-grid {
    grid-template-columns: 1fr;
  }

  .product-card--horizontal {
    grid-template-columns: 100px 1fr;
    gap: var(--space-sm);
    padding: var(--space-sm);
  }

  /* USP */
  .usp__heading {
    font-size: var(--text-xl);
  }

  .usp-tabs__content {
    padding: var(--space-md);
  }

  .usp-tabs__title {
    font-size: var(--text-xl);
  }

  .usp-tabs__desc {
    font-size: var(--text-sm);
  }

  .usp-tabs__btn-label {
    display: none;
  }

  .usp-tabs__btn {
    padding: 0.5rem;
  }

  .usp-tabs__btn-icon svg {
    width: 20px;
    height: 20px;
  }

  /* Section headers */
  .section__title {
    font-size: var(--text-xl);
  }

  .section__header {
    margin-bottom: var(--space-lg);
  }

  .footer__bottom p {
    font-size: var(--text-xs);
  }
}

/* ═══════════════════════════════════════════════════════════
   Product Detail Page Responsive
   ═══════════════════════════════════════════════════════════ */

@media (max-width: 1024px) {
  .product-top__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .product-gallery {
    position: static;
  }

  .product-gallery__main {
    aspect-ratio: 4/3;
  }

  .product-info__title {
    font-size: var(--text-2xl);
  }

  .product-info__price {
    font-size: var(--text-3xl);
  }
}

@media (max-width: 768px) {
  .product-gallery__main {
    border-radius: var(--radius-lg);
  }

  .product-gallery__thumb {
    width: 60px;
    height: 60px;
  }

  .product-info__title {
    font-size: var(--text-xl);
  }

  .product-info__price {
    font-size: var(--text-2xl);
  }

  .product-info__price-box {
    padding: var(--space-sm) var(--space-md);
  }

  .product-info__tags {
    flex-direction: column;
  }

  .product-tabs__nav {
    overflow-x: auto;
  }

  .product-tabs__tab {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-xs);
    white-space: nowrap;
  }

  .product-tabs__content {
    padding: var(--space-md);
  }

  .product-desc__item {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-sm);
  }

  .product-specs__label {
    width: 140px;
  }

  .product-specs__table td {
    padding: var(--space-sm);
    font-size: var(--text-xs);
  }
}

@media (max-width: 480px) {
  .product-gallery__thumb {
    width: 52px;
    height: 52px;
  }

  .product-info__actions .btn {
    font-size: var(--text-sm) !important;
    padding: 0.75rem 1rem;
  }

  .product-info__usps {
    padding: var(--space-sm);
  }

  .product-specs__table td {
    display: block;
    width: 100%;
  }

  .product-specs__label {
    width: 100%;
    border-bottom: none;
    padding-bottom: 0;
  }

  .product-specs__value {
    padding-top: 0;
  }
}