/* ============================================================
   Tria SKU Search — Main Stylesheet
   Tria Technologies branding
   ============================================================ */

/* ----------------------------------------------------------
   1. Custom Properties
   ---------------------------------------------------------- */
:root {
  --color-navy:         #001f63;
  --color-magenta:      #e10098;
  --color-magenta-hover:#c80085;
  --color-white:        #ffffff;
  --color-slate:        #334155;
  --color-light-gray:   #f1f5f9;
  --color-border:       #e2e8f0;
  --color-card-bg:      #ffffff;
  --color-highlight:    #fdf2f8;
  --font-heading:       'Oswald', sans-serif;
  --font-body:          Arial, Helvetica, sans-serif;
  --shadow-card:        0px 4px 10px -2px rgba(0,0,0,0.1);
  --radius:             6px;
}

/* ----------------------------------------------------------
   2. Reset & Base
   ---------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--color-slate);
  background: var(--color-light-gray);
  min-height: 100vh;
}

a {
  color: var(--color-magenta);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

button {
  font-family: var(--font-body);
  font-size: 14px;
  cursor: pointer;
  border: none;
  background: none;
}

input, select, textarea {
  font-family: var(--font-body);
  font-size: 14px;
}

/* ----------------------------------------------------------
   3. Header
   ---------------------------------------------------------- */
.site-header {
  background: var(--color-navy);
  color: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}

.header-inner {
  max-width: 1600px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-title {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-white);
  text-transform: uppercase;
}

/* ----------------------------------------------------------
   4. Loading Overlay
   ---------------------------------------------------------- */
.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: var(--color-light-gray);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.loading-overlay p {
  font-size: 15px;
  color: var(--color-slate);
  opacity: 0.8;
}

.loading-spinner {
  width: 44px;
  height: 44px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-magenta);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ----------------------------------------------------------
   5. App Container
   ---------------------------------------------------------- */
.app-container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 16px 80px; /* bottom padding so compare bar doesn't obscure content */
}

/* ----------------------------------------------------------
   6. Category Bar
   ---------------------------------------------------------- */
.category-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 14px 0 10px;
  align-items: center;
}

.category-pill {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 6px 16px;
  border-radius: 20px;
  border: 2px solid var(--color-navy);
  background: var(--color-white);
  color: var(--color-navy);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  white-space: nowrap;
}

.category-pill:hover {
  background: var(--color-navy);
  color: var(--color-white);
}

.category-pill.active {
  background: var(--color-magenta);
  border-color: var(--color-magenta);
  color: var(--color-white);
}

/* ----------------------------------------------------------
   7. Tab Bar
   ---------------------------------------------------------- */
.tab-bar {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 16px;
  overflow-x: auto;
  scrollbar-width: none;
}

.tab-bar::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 10px 22px;
  color: var(--color-slate);
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s, border-color 0.15s;
}

.tab-btn:hover {
  color: var(--color-magenta);
}

.tab-btn.active {
  color: var(--color-magenta);
  border-bottom-color: var(--color-magenta);
}

/* ----------------------------------------------------------
   8. Tab Panels
   ---------------------------------------------------------- */
.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* ----------------------------------------------------------
   9. Spec Layout (sidebar + results)
   ---------------------------------------------------------- */
.spec-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 16px;
  align-items: start;
}

/* ----------------------------------------------------------
   10. Filter Panel
   ---------------------------------------------------------- */
.filter-panel {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  max-height: calc(100vh - 160px);
  overflow-y: auto;
  position: sticky;
  top: 72px;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.filter-panel::-webkit-scrollbar {
  width: 5px;
}

.filter-panel::-webkit-scrollbar-track {
  background: transparent;
}

.filter-panel::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

/* Mobile filter toggle button — hidden on desktop */
.filter-toggle {
  display: none;
  width: 100%;
  margin-bottom: 12px;
  padding: 9px 16px;
  background: var(--color-navy);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  text-align: left;
}

.filter-section {
  margin-bottom: 20px;
}

.filter-section:last-child {
  margin-bottom: 0;
}

.filter-section-label {
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-navy);
  margin-bottom: 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--color-border);
}

/* Filter group (collapsible section) */
.filter-group {
  margin-bottom: 10px;
}

.filter-group-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 6px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.1s;
  user-select: none;
}

.filter-group-header:hover {
  background: var(--color-light-gray);
}

.filter-group-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-slate);
  flex: 1;
}

.filter-chevron {
  font-size: 10px;
  color: #94a3b8;
  transition: transform 0.15s;
}

.filter-group.collapsed .filter-chevron {
  transform: rotate(-90deg);
}

.filter-count-badge {
  display: none;
  background: var(--color-magenta);
  color: white;
  font-size: 11px;
  font-weight: 700;
  min-width: 18px;
  height: 18px;
  line-height: 18px;
  text-align: center;
  border-radius: 9px;
  padding: 0 5px;
}

.filter-selected-summary {
  display: none;
  font-size: 12px;
  color: var(--color-magenta);
  font-weight: 600;
  padding: 2px 6px 6px;
  line-height: 1.4;
}

/* Checkbox list */
.filter-checkboxes {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.filter-checkboxes label {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: background 0.1s;
}

.filter-checkboxes label:hover {
  background: var(--color-light-gray);
}

.filter-checkboxes input[type="checkbox"] {
  width: 14px;
  height: 14px;
  accent-color: var(--color-magenta);
  cursor: pointer;
  flex-shrink: 0;
}

/* Tri-state toggle button */
.tristate-btn {
  padding: 5px 12px;
  font-size: 12px;
  font-family: var(--font-body);
  font-weight: 600;
  border-radius: 20px;
  border: 2px solid #94a3b8;
  background: var(--color-white);
  color: #64748b;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  min-width: 60px;
  text-align: center;
}

.tristate-btn:hover {
  border-color: var(--color-slate);
}

.tristate-btn.yes {
  background: #16a34a;
  border-color: #16a34a;
  color: var(--color-white);
}

.tristate-btn.no {
  background: #dc2626;
  border-color: #dc2626;
  color: var(--color-white);
}

/* ----------------------------------------------------------
   11. Results Panel
   ---------------------------------------------------------- */
.results-panel {
  min-width: 0; /* prevent grid blowout */
}

/* ----------------------------------------------------------
   12. Search Box
   ---------------------------------------------------------- */
.search-box {
  margin-bottom: 14px;
}

.search-box input[type="text"] {
  width: 100%;
  padding: 10px 14px;
  font-size: 14px;
  font-family: var(--font-body);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-white);
  color: var(--color-slate);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.search-box input[type="text"]:focus {
  border-color: var(--color-magenta);
  box-shadow: 0 0 0 3px rgba(225, 0, 152, 0.12);
}

.search-box input[type="text"]::placeholder {
  color: #94a3b8;
}

/* ----------------------------------------------------------
   12b. Welcome Guide
   ---------------------------------------------------------- */
.welcome-guide {
  max-width: 700px;
  margin: 40px auto;
  text-align: center;
  padding: 40px 30px;
}

.welcome-guide h2 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.welcome-guide > p {
  font-size: 16px;
  color: var(--color-slate);
  margin-bottom: 32px;
}

.welcome-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  text-align: left;
  margin-bottom: 32px;
}

.welcome-tab {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow-card);
}

.welcome-tab h3 {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-magenta);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}

.welcome-tab p {
  font-size: 13px;
  color: var(--color-slate);
  line-height: 1.5;
}

.welcome-hint {
  font-size: 15px;
  color: var(--color-magenta);
  font-weight: 600;
}

@media (max-width: 768px) {
  .welcome-tabs {
    grid-template-columns: 1fr;
  }
  .welcome-guide {
    padding: 20px 16px;
    margin: 20px auto;
  }
  .welcome-guide h2 {
    font-size: 1.4rem;
  }
}

/* ----------------------------------------------------------
   13. Result Count
   ---------------------------------------------------------- */
.result-count {
  font-size: 12px;
  color: #64748b;
  margin-bottom: 10px;
  min-height: 18px;
}

/* ----------------------------------------------------------
   14. Card Grid
   ---------------------------------------------------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 12px;
}

/* ----------------------------------------------------------
   15. SKU Card
   ---------------------------------------------------------- */
.sku-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 14px 16px;
  transition: box-shadow 0.15s, border-color 0.15s;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sku-card:hover {
  box-shadow: 0px 6px 16px -2px rgba(0,0,0,0.14);
  border-color: #c7d2de;
}

.sku-card.selected {
  border-color: var(--color-magenta);
  box-shadow: 0 0 0 2px rgba(225, 0, 152, 0.18), var(--shadow-card);
}

/* Card header row */
.card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.card-order-no {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-navy);
  letter-spacing: 0.02em;
  flex: 1 1 auto;
  min-width: 0;
}

.card-family {
  font-size: 12px;
  color: #64748b;
  font-style: italic;
}

/* Status badge */
.status-badge {
  display: inline-block;
  background: var(--color-magenta);
  color: var(--color-white);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  padding: 2px 8px;
  border-radius: 20px;
  white-space: nowrap;
  text-transform: uppercase;
  flex-shrink: 0;
}

.status-badge.status-active {
  background: var(--color-magenta);
}

.status-badge.status-obsolete {
  background: #64748b;
}

.status-badge.status-new,
.status-badge.status-preview {
  background: #0369a1;
}

/* Card reference line */
.card-reference {
  font-size: 12px;
  color: #64748b;
  font-family: 'Courier New', Courier, monospace;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Spec grid inside card */
.card-specs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 8px 10px;
  margin-top: 4px;
}

.spec-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.spec-label {
  font-size: 11px;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.spec-value {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-slate);
}

/* Card footer with Details button */
.card-footer {
  margin-top: auto;
  padding-top: 6px;
  display: flex;
  justify-content: flex-end;
}

.btn-details {
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 5px 16px;
  background: none;
  color: var(--color-magenta);
  border: 2px solid var(--color-magenta);
  border-radius: 0;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.btn-details:hover {
  background: var(--color-magenta);
  color: white;
}

/* Compare checkbox */
.compare-check {
  width: 16px;
  height: 16px;
  accent-color: var(--color-magenta);
  cursor: pointer;
  flex-shrink: 0;
}

/* ----------------------------------------------------------
   16. Decoded Panel (Part No. tab)
   ---------------------------------------------------------- */
.decoded-panel {
  background: var(--color-light-gray);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px 16px;
}

.decoded-panel:empty {
  display: none;
}

.decoded-field {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.decoded-field-label {
  font-size: 11px;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.decoded-field-value {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-navy);
}

.decoded-field-value.unknown {
  color: #94a3b8;
  font-weight: 400;
  font-style: italic;
}

/* ----------------------------------------------------------
   17. Browse Table
   ---------------------------------------------------------- */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.browse-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  background: var(--color-card-bg);
}

.browse-table thead th {
  background: var(--color-navy);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 11px 14px;
  text-align: left;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  position: sticky;
  top: 0;
  z-index: 10;
}

.browse-table thead th:hover {
  background: #003090;
}

.browse-table thead th::after {
  content: '';
  display: inline-block;
  width: 14px;
  margin-left: 4px;
  text-align: center;
  opacity: 0.7;
}

.browse-table thead th.sort-asc::after {
  content: '▲';
}

.browse-table thead th.sort-desc::after {
  content: '▼';
}

.browse-table tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: background 0.1s;
}

.browse-table tbody tr:last-child {
  border-bottom: none;
}

.browse-table tbody tr:hover {
  background: var(--color-highlight);
}

.browse-table tbody td {
  padding: 10px 14px;
  color: var(--color-slate);
  vertical-align: middle;
}

.browse-table tbody td:first-child {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-navy);
  letter-spacing: 0.02em;
}

/* ----------------------------------------------------------
   18. Compare Bar (fixed bottom)
   ---------------------------------------------------------- */
.compare-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: var(--color-navy);
  color: var(--color-white);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  box-shadow: 0 -2px 12px rgba(0,0,0,0.25);
}

#compare-count {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.85);
  flex: 1;
}

/* ----------------------------------------------------------
   19. Utility Buttons
   ---------------------------------------------------------- */
.btn-accent {
  background: var(--color-magenta);
  color: var(--color-white);
  border: 2px solid var(--color-magenta);
  padding: 8px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  font-family: var(--font-heading);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  white-space: nowrap;
}

.btn-accent:hover {
  background: var(--color-magenta-hover);
  border-color: var(--color-magenta-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--color-white);
  border: 2px solid rgba(255, 255, 255, 0.6);
  padding: 8px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  font-family: var(--font-heading);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  white-space: nowrap;
}

.btn-secondary:hover {
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

/* ----------------------------------------------------------
   20. Compare Modal
   ---------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-content {
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: 0 8px 40px rgba(0,0,0,0.35);
  max-width: 90vw;
  max-height: 85vh;
  overflow: auto;
  display: flex;
  flex-direction: column;
  width: 100%;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-white);
  z-index: 10;
  flex-shrink: 0;
}

.modal-header h2 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-navy);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.modal-close {
  font-size: 24px;
  line-height: 1;
  color: #64748b;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background 0.15s, color 0.15s;
}

.modal-close:hover {
  background: var(--color-light-gray);
  color: var(--color-slate);
}

/* Detail modal */
.detail-modal-content {
  max-width: 700px;
}

.detail-modal-body {
  padding: 16px 20px;
  overflow-y: auto;
  flex: 1;
}

.detail-section {
  margin-bottom: 20px;
}

.detail-section:last-child {
  margin-bottom: 0;
}

.detail-section-label {
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-navy);
  margin-bottom: 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--color-border);
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 16px;
}

.detail-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 3px 0;
  gap: 8px;
}

.detail-label {
  font-size: 12px;
  color: #94a3b8;
  white-space: nowrap;
}

.detail-value {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-slate);
  text-align: right;
}

.detail-value a {
  font-weight: 400;
  word-break: break-all;
}

.detail-description {
  font-size: 13px;
  color: var(--color-slate);
  white-space: pre-line;
  line-height: 1.5;
  background: var(--color-light-gray);
  padding: 10px 12px;
  border-radius: var(--radius);
}

.compare-table-wrapper {
  overflow-x: auto;
  padding: 16px 20px;
  flex: 1;
}

/* Comparison table inside modal */
.compare-table-wrapper table {
  border-collapse: collapse;
  font-size: 13px;
  min-width: 500px;
}

.compare-table-wrapper table th,
.compare-table-wrapper table td {
  padding: 9px 14px;
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.compare-table-wrapper table thead th {
  background: var(--color-navy);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
  white-space: nowrap;
}

/* First column sticky (row labels) */
.compare-table-wrapper table th:first-child,
.compare-table-wrapper table td:first-child {
  position: sticky;
  left: 0;
  z-index: 5;
  background: var(--color-light-gray);
  font-weight: 700;
  font-size: 12px;
  color: var(--color-navy);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
  min-width: 130px;
}

.compare-table-wrapper table thead th:first-child {
  background: var(--color-navy);
  color: var(--color-white);
  z-index: 15;
}

/* Diff highlight */
.compare-table-wrapper table td.diff {
  background: var(--color-highlight);
  font-weight: 600;
}

.compare-table-wrapper table tbody tr:hover td {
  background: #f8f9ff;
}

.compare-table-wrapper table tbody tr:hover td:first-child {
  background: #eef0f7;
}

/* ----------------------------------------------------------
   21. Empty / No-results state
   ---------------------------------------------------------- */
.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 48px 16px;
  color: #94a3b8;
  font-size: 14px;
}

.no-results-icon {
  font-size: 40px;
  margin-bottom: 12px;
  opacity: 0.5;
}

/* ----------------------------------------------------------
   22. Responsive — 768px–1024px (medium)
   ---------------------------------------------------------- */
@media (max-width: 1024px) {
  .spec-layout {
    grid-template-columns: 1fr;
  }

  .filter-panel {
    position: static;
    max-height: none;
    overflow-y: visible;
    display: none; /* hidden until toggled */
  }

  .filter-panel.open {
    display: block;
  }

  .filter-toggle {
    display: block;
  }

  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
}

/* ----------------------------------------------------------
   23. Responsive — <768px (mobile)
   ---------------------------------------------------------- */
@media (max-width: 768px) {
  .header-inner {
    padding: 12px 16px;
  }

  .site-title {
    font-size: 1.25rem;
  }

  .app-container {
    padding: 0 10px 80px;
  }

  /* Category bar — horizontal scroll on mobile */
  .category-bar {
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    padding: 10px 0 8px;
    gap: 6px;
    -webkit-overflow-scrolling: touch;
  }

  .category-bar::-webkit-scrollbar {
    display: none;
  }

  .category-pill {
    flex-shrink: 0;
    padding: 5px 12px;
    font-size: 12px;
  }

  /* Tab bar — horizontal scroll */
  .tab-bar {
    gap: 0;
  }

  .tab-btn {
    padding: 10px 14px;
    font-size: 12px;
  }

  /* Cards — single column */
  .card-grid {
    grid-template-columns: 1fr;
  }

  .decoded-panel {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }

  .compare-bar {
    padding: 10px 14px;
    gap: 8px;
  }

  .btn-accent,
  .btn-secondary {
    padding: 7px 14px;
    font-size: 13px;
  }

  .modal-content {
    max-height: 92vh;
    max-width: 98vw;
  }
}

/* ----------------------------------------------------------
   24. Accessibility & Focus
   ---------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--color-magenta);
  outline-offset: 2px;
}

button:focus-visible {
  outline: 2px solid var(--color-magenta);
  outline-offset: 2px;
}