/* Mobile-First Responsive Styles */

/* ========================
   MOBILE BASE (< 640px)
   ======================== */

/* Prevent horizontal scroll */
html, body {
  overflow-x: hidden;
}

/* Touch-friendly targets */
@media (max-width: 639px) {
  /* Ensure minimum tap targets */
  .search-btn,
  .tab,
  .pagination__btn,
  .filter-select,
  .clear-filters-btn,
  .link-btn {
    min-height: var(--touch-target-min);
  }

  /* Tabs - horizontal scroll */
  .tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; /* Firefox */
    padding-bottom: var(--space-2);
    margin-left: calc(-1 * var(--space-3));
    margin-right: calc(-1 * var(--space-3));
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }

  .tabs::-webkit-scrollbar {
    display: none;
  }

  .tab {
    flex-shrink: 0;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
  }

  /* Filter bar - stack vertically */
  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-group {
    width: 100%;
    justify-content: space-between;
  }

  .filter-select {
    flex: 1;
    min-width: 0;
    height: var(--touch-target-min);
  }

  .clear-filters-btn {
    width: 100%;
    height: var(--touch-target-min);
    margin-top: var(--space-2);
  }

  /* Search mode - larger touch targets */
  .search-mode {
    gap: var(--space-6);
  }

  .search-mode__option {
    padding: var(--space-2) 0;
  }

  .search-mode__option input[type="radio"] {
    width: 20px;
    height: 20px;
  }

  /* Pagination - wrap and center */
  .pagination {
    justify-content: center;
    flex-wrap: wrap;
  }

  .pagination__btn {
    min-width: var(--touch-target-min);
    height: var(--touch-target-min);
    font-size: var(--text-sm);
  }

  .pagination__input {
    width: 60px;
    height: var(--touch-target-min);
    font-size: var(--text-sm);
  }

  .pagination__select {
    height: var(--touch-target-min);
    font-size: var(--text-sm);
  }

  /* Stats grid - single column on very small screens */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
  }

  .stat-card {
    padding: var(--space-3);
  }

  .stat-card__value {
    font-size: var(--text-xl);
  }

  .stat-card__label {
    font-size: var(--text-xs);
  }

  /* Batch grid - single column */
  .batch-grid {
    grid-template-columns: 1fr;
  }

  /* Header stats - detailed rules in header.css */

  /* Overview sections */
  .overview-section {
    padding: var(--space-3);
    margin-bottom: var(--space-3);
  }

  /* Dataset table - card layout */
  .dataset-table {
    display: block;
  }

  .dataset-table thead {
    display: none;
  }

  .dataset-table tbody {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
  }

  .dataset-table tr {
    display: flex;
    flex-direction: column;
    background: var(--gray-50);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
  }

  .dataset-table td {
    display: flex;
    justify-content: space-between;
    padding: var(--space-1) 0;
    border-bottom: 1px solid var(--gray-100);
  }

  .dataset-table td:last-child {
    border-bottom: none;
  }

  .dataset-table td::before {
    content: attr(data-label);
    font-weight: var(--font-semibold);
    color: var(--gray-600);
    font-size: var(--text-xs);
    text-transform: uppercase;
  }

  /* Alerts - more compact */
  .alert {
    padding: var(--space-3) var(--space-4);
    flex-direction: column;
    gap: var(--space-2);
  }

  .alert__icon {
    font-size: var(--text-lg);
  }

  /* Link buttons - full width in card mode */
  .results-table--responsive .link-btn {
    width: 100%;
    justify-content: center;
    padding: var(--space-3);
  }
}

/* Very small screens (< 375px) */
@media (max-width: 374px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .site-title {
    font-size: var(--text-lg);
  }

  .search-box {
    padding: var(--space-3);
  }

  .search-input {
    font-size: 16px; /* Prevents iOS zoom on focus */
  }

  .tab {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
  }
}

/* ========================
   TABLET (640px - 1023px)
   ======================== */

@media (min-width: 640px) and (max-width: 1023px) {
  /* Tabs can wrap but still touch-friendly */
  .tab {
    min-height: 40px;
  }

  /* Stats grid - 3 columns */
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

/* ========================
   LANDSCAPE MODE
   ======================== */

@media (max-width: 896px) and (orientation: landscape) {
  /* Reduce vertical padding in landscape */
  .site-header {
    padding: var(--space-2) 0;
  }

  .search-box {
    margin-top: calc(-1 * var(--space-3));
    padding: var(--space-3);
  }

  .tabs {
    margin: var(--space-2) 0;
  }

  /* Smaller empty state in landscape */
  .empty-state {
    padding: var(--space-8) var(--space-4);
  }

  .loading-container {
    padding: var(--space-8) var(--space-4);
  }
}

/* ========================
   SAFE AREA INSETS (Notch)
   ======================== */

@supports (padding: max(0px)) {
  .container {
    padding-left: max(var(--space-3), env(safe-area-inset-left));
    padding-right: max(var(--space-3), env(safe-area-inset-right));
  }

  @media (min-width: 640px) {
    .container {
      padding-left: max(var(--space-4), env(safe-area-inset-left));
      padding-right: max(var(--space-4), env(safe-area-inset-right));
    }
  }
}

/* ========================
   REDUCED MOTION
   ======================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ========================
   HIGH CONTRAST MODE
   ======================== */

@media (prefers-contrast: high) {
  .tab {
    border-width: 2px;
  }

  .search-input {
    border-width: 2px;
  }

  .badge {
    border-width: 2px;
  }
}