/* ============================================
   Responsive Breakpoints — Comprehensive
   ============================================ */

/* --- 4K (3840px) --- */
@media (min-width: 2560px) {
  :root { --zs-container-max: 1600px; }
  html { font-size: 18px; }
}

/* --- 2K (2560px) --- */
@media (max-width: 2559px) and (min-width: 1921px) {
  :root { --zs-container-max: 1500px; }
}

/* --- 1920px --- */
@media (max-width: 1920px) {
  :root { --zs-container-max: 1370px; }
}

/* --- Laptop HD (1536px) --- */
@media (max-width: 1535px) {
  :root { --zs-container-max: 1280px; }
}

/* --- Laptop (1280px) --- */
@media (max-width: 1279px) {
  :root { --zs-container-max: 1024px; }
  .zs-section { padding: 60px 0; }
  .zs-section-title { font-size: var(--zs-font-size-3xl); }
}

/* ============================================
   Tablet (1024px)
   ============================================ */
@media (max-width: 1024px) {
  :root { --zs-container-max: 768px; }
  .zs-md-2, .zs-md-3, .zs-md-4 { width: 50%; }
  .zs-ml-3, .zs-mr-7, .zs-ml-7, .zs-mr-3 { width: 100%; }
  .zs-page-banner { height: 240px; }
  .zs-page-banner h2 { font-size: var(--zs-font-size-2xl); }

  /* Product Layout */
  .zs-product-layout { flex-direction: column; }
  .zs-product-sidebar {
    width: 100%;
    position: static;
    border-radius: 8px;
  }
  .zs-product-sidebar-title { display: none; }
  .zs-product-sidebar-title::after { display: none; }
  .zs-cat-list {
    flex-direction: column;
    gap: 0;
    padding: 0;
  }
  .zs-cat-item { border-bottom: none; }
  .zs-cat-link {
    padding: 10px 16px;
    font-size: 14px;
    border-left: 3px solid transparent;
  }
  .zs-cat-link:hover,
  .zs-cat-item.active > .zs-cat-link {
    border-left-color: var(--zs-color-primary);
    padding-left: 16px;
  }
  .zs-cat-sub {
    background: #fafbfc;
  }
  .zs-cat-sub li a {
    padding: 8px 16px 8px 40px;
    font-size: 13px;
  }
  .zs-cat-sub li::before {
    left: 24px;
  }
  .zs-product-list-grid { grid-template-columns: repeat(3, 1fr); }

  /* Product Detail */
  .zs-product-detail { flex-direction: column; gap: 32px; }
  .zs-product-gallery,
  .zs-product-info { width: 100%; }
  .zs-product-gallery { position: static; }

  /* Product Action Row */
  .zs-product-action-row { flex-wrap: wrap; }

  /* Detail Tabs */
  .zs-detail-layout { flex-direction: column; }
  .zs-detail-sidebar { width: 100%; }
  .zs-detail-related-list { flex-direction: row; flex-wrap: wrap; }
  .zs-detail-related-item { width: calc(50% - 7px); }
  .zs-detail-main { border-radius: 6px; }
  .zs-detail-sidebar { border-radius: 6px; }

  /* Sidebar Recommend */
  .zs-sidebar-recommend-list { flex-direction: row; flex-wrap: wrap; gap: 8px; }
  .zs-sidebar-recommend-list li { width: calc(50% - 4px); }
}

/* ============================================
   Mobile Landscape / Small Tablet (768px)
   ============================================ */
@media (max-width: 768px) {
  :root { --zs-container-max: 640px; }
  html { font-size: 14px; }
  .zs-section { padding: 28px 0; }
  .zs-section-header { margin-bottom: 20px; }
  .zs-md-2, .zs-md-3, .zs-md-4, .zs-md-5, .zs-md-6 { width: 100%; }
  .zs-ml-4, .zs-mr-6, .zs-ml-5, .zs-mr-5 { width: 100%; }
  .zs-page-banner { height: 180px; }
  .zs-page-banner h2 { font-size: var(--zs-font-size-xl); }
  .zs-breadcrumb { font-size: 12px; }

  /* Product Layout */
  .zs-product-layout { gap: 20px; }
  .zs-product-sidebar { padding: 0; border-radius: 8px; }
  .zs-product-search { height: 44px; }
  .zs-product-search-btn { min-width: 44px; width: 44px; height: 44px; }
  .zs-product-sidebar-title { padding: 16px 16px 12px; font-size: 13px; }
  .zs-product-sidebar-title::after { left: 16px; }
  .zs-cat-link { padding: 8px 12px; font-size: 12px; }
  .zs-cat-sub li a { padding: 6px 16px 6px 36px; font-size: 12px; }
  .zs-cat-sub li::before { left: 22px; }

  .zs-product-list-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .zs-product-content-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .zs-product-content-title h2 { font-size: 20px; }
  .zs-product-content-title { flex-wrap: wrap; gap: 8px; }
  .zs-product-list-card .zs-card-body { padding: 12px 10px; }
  .zs-product-list-card .zs-card-body h4 { font-size: 13px; min-height: auto; }
  .zs-product-list-card .zs-product-model-tag { font-size: 10px; padding: 3px 8px; top: 8px; left: 8px; }

  /* Product Detail */
  .zs-product-detail { gap: 24px; padding: 10px 0; }
  .zs-product-info h2 { font-size: 20px; margin-bottom: 12px; }
  .zs-product-model-info { padding: 5px 12px; margin-bottom: 16px; }
  .zs-product-model-label { font-size: 11px; }
  .zs-product-model-value { font-size: 12px; }
  .zs-product-specs { padding: 20px; border-radius: 6px; }
  .zs-product-specs h3 { font-size: 13px; margin-bottom: 16px; }
  .zs-specs-list { gap: 10px; }
  .zs-specs-list li { font-size: 13px; padding-left: 16px; }
  .zs-specs-list li::before { width: 6px; height: 6px; top: 8px; }

  /* Product Action Row */
  .zs-product-action-row {
    flex-direction: column;
    gap: 12px;
    align-items: stretch;
  }
  .zs-product-info .zs-btn-primary {
    width: 100%;
    justify-content: center;
    height: 44px;
    font-size: 13px;
    padding: 0 24px;
  }
  .zs-product-nav {
    justify-content: center;
    margin-left: 0;
  }
  .zs-product-nav-link { font-size: 12px; padding: 6px 10px; }

  /* Product Tags */
  .zs-product-tags { margin-top: 16px; padding-top: 16px; gap: 6px; }
  .zs-product-tags a { font-size: 11px; padding: 4px 10px; }

  /* Gallery Thumbs */
  .zs-product-gallery-main img { padding: 12px; }
  .zs-thumb-track img { width: 56px; height: 56px; }
  .zs-thumb-prev, .zs-thumb-next { width: 28px; height: 28px; }
  .zs-thumb-prev svg, .zs-thumb-next svg { width: 12px; height: 12px; }

  /* Detail Tabs */
  .zs-detail-tabs-section { padding-top: 40px; margin-top: -40px; padding-bottom: 40px; }
  .zs-detail-tabs { flex-wrap: wrap; }
  .zs-detail-tab {
    flex: none;
    width: 50%;
    border-right: none;
    border-bottom: 1px solid rgba(0,0,0,0.06);
    font-size: 11px;
    padding: 12px 10px;
  }
  .zs-detail-panel { padding: 20px 16px 28px; }
  .zs-detail-panel h3 { font-size: 16px; margin-bottom: 16px; padding-bottom: 10px; }
  .zs-detail-panel p { font-size: 13px; }
  .zs-detail-panel li { font-size: 13px; padding-left: 18px; }
  .zs-detail-related-item { width: 100%; }
  .zs-basic-table th { width: 100px; font-size: 13px; }
  .zs-basic-table td { font-size: 13px; }

  /* Key Features & Applications */
  .zs-product-features, .zs-product-applications { margin-top: 32px; padding-top: 24px; }
  .zs-product-features h3, .zs-product-applications h3 { font-size: 18px; }
  .zs-product-features li, .zs-product-applications li { font-size: 13px; }

  /* Sidebar Recommend */
  .zs-sidebar-recommend { padding: 16px; }
  .zs-sidebar-recommend-title { font-size: 14px; }
  .zs-sidebar-recommend-list { flex-direction: column; }
  .zs-sidebar-recommend-list li { width: 100%; }

  /* Pagination */
  .zs-pagination { margin-top: 32px; gap: 4px; }
  .zs-pagination a, .zs-pagination span { min-width: 36px; height: 36px; font-size: 13px; padding: 0 8px; }

  /* Category Description */
  .zs-product-cat-desc { margin-bottom: 20px; padding-bottom: 16px; }
  .zs-product-cat-desc p { font-size: 13px; }

  /* Just for you button */
  .zs-btn-just-for-you { height: 36px; padding: 0 16px; font-size: 13px; }
}

/* ============================================
   Mobile Portrait (480px)
   ============================================ */
@media (max-width: 480px) {
  :root { --zs-container-padding: 12px; }
  .zs-btn { padding: 10px 24px; font-size: var(--zs-font-size-xs); }
  .zs-page-banner { height: 150px; }
  .zs-page-banner h2 { font-size: var(--zs-font-size-lg); }

  /* Product Grid: still 2 columns but tighter */
  .zs-product-list-grid { gap: 8px; }
  .zs-product-list-card .zs-card-body { padding: 10px 8px; }
  .zs-product-list-card .zs-card-body h4 { font-size: 12px; }
  .zs-product-list-card .zs-product-model-tag { font-size: 9px; padding: 2px 6px; }

  /* Product Detail */
  .zs-product-info h2 { font-size: 18px; }
  .zs-product-specs { padding: 16px; }
  .zs-specs-list li { font-size: 12px; }

  /* Nav buttons */
  .zs-product-nav-link { font-size: 11px; padding: 5px 8px; gap: 3px; }
  .zs-product-nav-link svg { width: 14px; height: 14px; }
  .zs-product-nav { gap: 4px; }

  /* Tags */
  .zs-product-tags a { font-size: 10px; padding: 3px 8px; }

  /* Detail Tabs */
  .zs-detail-tab { font-size: 10px; padding: 10px 8px; letter-spacing: 0; }
  .zs-detail-panel { padding: 16px 12px 24px; }
  .zs-detail-panel h3 { font-size: 15px; }

  /* Sidebar */
  .zs-detail-sidebar { padding: 20px 16px; }
  .zs-detail-sidebar-title { font-size: 14px; }
  .zs-detail-related-img { width: 56px; height: 56px; }
  .zs-detail-related-item h4 { font-size: 12px; }

  /* Gallery */
  .zs-thumb-track img { width: 48px; height: 48px; border-width: 1px; }
  .zs-product-gallery-main { border-radius: 8px; }
  .zs-product-gallery-thumbs { gap: 6px; }
}

/* ============================================
   Very Small Screens (360px)
   ============================================ */
@media (max-width: 360px) {
  :root { --zs-container-padding: 10px; }

  .zs-product-content-title h2 { font-size: 18px; }
  .zs-product-info h2 { font-size: 16px; }
  .zs-product-list-grid { grid-template-columns: 1fr; }

  .zs-detail-tab { width: 50%; font-size: 9px; }

  .zs-product-nav { flex-wrap: wrap; justify-content: center; }
}