@media (max-width: 900px) {
  .topbar {
    grid-template-columns: 1fr;
    justify-items: start;
    gap: 4px;
    padding: 8px 14px;
    min-height: auto;
  }

  .topbar .route {
    grid-column: auto;
  }

  .brand-inner {
    width: calc(100% - 24px);
    margin: 0 auto 16px;
    padding: 0 12px;
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .brand-inner h1 {
    font-size: 24px;
  }

  .banner {
    width: calc(100% - 24px);
  }

  .main-nav {
    width: 100%;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    padding: 12px 12px 14px;
  }

  .main-nav a,
  .nav-dropdown > summary {
    margin-left: 0 !important;
  }

  .main-nav-simple a {
    min-width: 0;
    flex: 1 1 calc(50% - 10px);
  }

  .page-shell {
    width: 100%;
    padding: 18px 12px 36px;
  }

  .page-heading,
  .detail-head,
  .supplier-head .detail-head-title-row,
  .split-section,
  .two-col,
  .backlog-intro {
    grid-template-columns: 1fr;
    display: grid;
    gap: 16px;
  }

  .page-heading,
  .detail-head {
    flex-direction: column;
  }

  .stats-row,
  .kpi-grid,
  .quick-links-grid,
  .backlog-grid,
  .backlog-doc-grid {
    grid-template-columns: 1fr;
  }

  .stats-row div {
    min-width: 0;
  }

  .table-wrap,
  .table-wrap-scroll {
    max-width: 100%;
  }

  table {
    min-width: 720px;
  }

  .compact table {
    min-width: 520px;
  }

  .meta-grid {
    width: 100%;
    min-width: 0;
    grid-template-columns: 1fr 1fr;
  }

  .supplier-head .meta-grid {
    grid-template-columns: 1fr 1fr;
  }

  .document-layout,
  .response-preview-layout,
  .response-body-fullwidth,
  .response-panel-stack,
  .response-body,
  .backlog-command-bar {
    display: grid;
    grid-template-columns: 1fr;
  }

  .backlog-command-bar {
    gap: 12px;
    padding: 14px 14px 0;
    border-radius: 18px 18px 0 0;
  }

  .backlog-command-left,
  .backlog-command-center,
  .backlog-command-right {
    justify-content: flex-start;
  }

  .backlog-mode-toggle {
    padding: 0;
    flex-wrap: wrap;
    gap: 6px;
  }

  .backlog-mode-option {
    min-height: 44px;
    padding: 0 16px;
    border-radius: 14px 14px 0 0;
  }

  .backlog-filter-pillset,
  .tab-strip {
    justify-content: flex-start;
  }

  .viewer-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .viewer-toolbar-actions,
  .file-list,
  .supplier-actions,
  .form-actions,
  .toolbar-form {
    flex-wrap: wrap;
  }

  .viewer-frame,
  .download-panel,
  .download-panel.no-attachment {
    min-height: 62vh;
    height: 62vh;
  }

  .download-panel.no-attachment p {
    font-size: 28px;
  }

  .entity-selector-form .select-nav,
  .select-nav {
    width: 100%;
    min-width: 0;
  }

  .supplier-head .detail-head-main {
    width: 100%;
  }

  .supplier-head .detail-head-title-row {
    align-items: flex-start;
  }

  .backlog-shell .section-band,
  .backlog-shell .table-section {
    margin-top: 20px;
  }
}

@media (max-width: 640px) {
  .topbar {
    font-size: 12px;
  }

  .brand-inner h1 {
    font-size: 21px;
  }

  .main-nav-simple a {
    flex: 1 1 100%;
  }

  .stats-row {
    gap: 8px;
  }

  .stats-row div {
    padding: 10px 12px;
  }

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

  .supplier-head .meta-grid {
    grid-template-columns: 1fr;
  }

  .quick-link-card,
  .list-item,
  .backlog-card,
  .backlog-column,
  .section-band,
  .detail-head {
    border-radius: 6px;
  }

  .file-tab,
  .inline-file-tab {
    width: 100%;
    max-width: 100%;
  }

  .backlog-mode-option {
    width: 100%;
  }

  .backlog-mode-toggle {
    width: 100%;
  }

  .viewer-toolbar-actions .inline-file-tab {
    width: auto;
  }
}