@media (max-width: 75rem) {
  .app {
    width: 100vw;
    height: 100dvh;
    margin: 0;
    border-radius: 0;
  }

  .topbar {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    flex-wrap: wrap;
  }

  .topbar-brand-group {
    order: 1;
    flex: 0 1 22rem;
  }

  .topbar-user-group {
    order: 2;
    flex: 0 0 auto;
    margin-left: auto;
  }

  .topbar-navigation-group {
    position: static;
    left: auto;
    top: auto;
    width: 100%;
    max-width: none;
    transform: none;
    order: 3;
    flex: 1 1 100%;
    justify-content: flex-start;
  }

  .top-nav {
    flex: 0 0 auto;
    width: auto;
    justify-content: flex-start;
    justify-self: stretch;
    overflow-x: auto;
  }

  .top-actions {
    width: auto;
    justify-content: space-between;
    flex-wrap: wrap;
    margin-left: 0;
  }

  .system-chip {
    order: 2;
  }

  .shell {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(16rem, 22rem) minmax(0, 1fr) minmax(16rem, auto);
    gap: 0.75rem;
  }

  .panel-left {
    border-right: 0;
  }

  .metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.85rem;
  }

  .dashboard-panel,
  .dashboard-panel-wide {
    grid-column: span 2;
  }

  .dashboard-stat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .quotation-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .integration-card {
    grid-template-columns: 1fr;
  }

  .settings-admin-grid {
    grid-template-columns: 1fr;
  }

  .settings-admin-grid-optimized {
    grid-template-areas:
      "company"
      "business"
      "users"
      "ai";
  }

  .art-panel {
    grid-template-columns: 1fr;
  }

  .integration-grid,
  .integration-signal-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 45rem) {
  .app {
    width: 100vw;
    height: 100dvh;
    margin: 0;
    padding: 0.5rem;
    border: 0;
    border-radius: 0;
  }

  .topbar {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 0.75rem;
    padding: calc(0.75rem + env(safe-area-inset-top)) 0.875rem 0.75rem;
    border-radius: var(--radius);
    backdrop-filter: none;
  }

  body[data-mobile-chat-open="true"] .topbar {
    display: none;
  }

  .topbar-brand-group {
    grid-column: 1;
    grid-row: 1;
    min-width: 0;
  }

  .topbar-user-group {
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
  }

  .topbar-navigation-group {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    display: block;
    min-width: 0;
  }

  .brand {
    min-width: 0;
    width: 12.2rem;
    height: 2.75rem;
    padding: 0.35rem 0.55rem;
    gap: 0.42rem;
  }

  .brand-logo {
    width: 8.1rem;
    height: 2rem;
  }

  .brand-company-name {
    max-width: 6.4rem;
    font-size: 0.68rem;
  }

  .brand-dot {
    width: 2.25rem;
    height: 2.25rem;
  }

  .brand-title {
    font-size: 0.9375rem;
  }

  .brand-sub,
  .brand-title,
  .user-chip {
    display: none;
  }

  .topbar .profile-chip {
    display: inline-flex;
    min-width: 2.9rem;
    max-width: 9.8rem;
    padding-right: 0.5rem;
  }

  .topbar .profile-chip .user-role {
    display: none;
  }

  .top-actions {
    width: auto;
    gap: 0.5rem;
    margin-left: auto;
  }

  .topbar #newConversationBtn {
    display: none;
  }

  .top-actions .ghost {
    padding: 0.625rem 0.875rem;
    font-size: 0.8125rem;
  }

  .admin-ai-status-copy small {
    display: none;
  }

  .admin-ai-panel {
    position: fixed;
    top: 4.8rem;
    right: 0.75rem;
    left: 0.75rem;
    width: auto;
    max-height: calc(100dvh - 6rem);
    overflow: auto;
  }

  .admin-ai-health-grid {
    grid-template-columns: 1fr;
  }

  .admin-ai-prompt-toolbar,
  .admin-ai-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .admin-ai-prompt-tools {
    width: 100%;
  }

  .admin-ai-prompt-tools .ghost,
  .admin-ai-actions .ghost,
  .admin-ai-actions .primary {
    width: 100%;
    justify-content: center;
  }

  .system-chip {
    display: none;
  }

  .top-nav {
    position: fixed;
    left: 0.5rem;
    right: 0.5rem;
    bottom: 0;
    z-index: 40;
    order: initial;
    justify-content: space-around;
    gap: 0.25rem;
    padding: 0.35rem calc(0.5rem + env(safe-area-inset-right)) calc(0.45rem + env(safe-area-inset-bottom)) calc(0.5rem + env(safe-area-inset-left));
    background: var(--glass-strong);
    border: 0.0625rem solid var(--glass-border);
    border-radius: var(--radius) var(--radius) 0 0;
    box-shadow: 0 -0.75rem 2rem rgba(17, 27, 33, 0.12);
    backdrop-filter: blur(1rem) saturate(145%);
    overflow: visible;
  }

  body .top-nav {
    background: var(--glass-strong);
  }

  .nav-btn {
    flex: 1;
    width: auto;
    max-width: none;
    height: 3.125rem;
    min-width: 3.125rem;
    padding: 0;
    border-radius: var(--radius);
    justify-content: center;
  }

  .nav-icon {
    width: 1.5rem;
    height: 1.5rem;
  }

  .nav-copy {
    display: none;
  }

  .views {
    padding-bottom: 4.75rem;
  }

  body[data-mobile-chat-open="true"] .views {
    padding-bottom: 0;
  }

  .metrics-view,
  .clients-view,
  .settings-view,
  .quotation-view,
  .calculator-view {
    padding: 0;
  }

  .subscription-view {
    width: min(calc(100% - 1.25rem), 96rem);
    padding: 0;
  }

  section.view[data-view="subscription"],
  section.view[data-view="settings"] {
    padding-bottom: 4.75rem;
  }

  .calculator-grid,
  .sheet-calculator-grid {
    grid-template-columns: 1fr;
    width: 100%;
    max-width: none;
  }

  .calculator-summary {
    position: static;
  }

  .calculator-controls,
  .sheet-calculator-controls {
    grid-template-columns: 1fr 1fr;
  }

  .calculator-summary-row {
    grid-template-columns: 1fr;
  }

  .calculator-controls::after {
    grid-column: 1 / -1;
    justify-self: start;
    padding-bottom: 0;
  }

  .art-appearance-grid,
  .art-theme-toggle {
    grid-template-columns: 1fr;
  }

  .metrics {
    width: 100%;
    grid-auto-flow: row;
    grid-template-columns: 1fr;
    overflow-x: hidden;
    overflow-y: visible;
    padding: 0 0 0.5rem;
  }

  .metrics-toolbar {
    display: flex;
    min-height: 3.35rem;
    height: auto;
    width: 100%;
    justify-content: flex-start;
  }

  .metrics-tab {
    flex: 0 0 10.5rem;
    min-height: 2.85rem;
    height: auto;
  }

  .dashboard-panel,
  .dashboard-panel-wide {
    grid-column: 1;
  }

  .dashboard-stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .quotation-summary {
    grid-template-columns: 1fr;
  }

  .clients-summary {
    grid-template-columns: 1fr;
  }

  .clients-panel {
    min-height: 24rem;
    flex: 1 1 auto;
  }

  .clients-toolbar,
  .quotation-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .clients-result-count,
  .quotation-result-count {
    white-space: normal;
  }

  .quotation-form-measures {
    grid-template-columns: 1fr;
  }

  .quotation-product-controls {
    grid-template-columns: 1fr;
  }

  .dashboard-bar-row {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .dashboard-bar-track {
    grid-column: 1 / -1;
    order: 3;
  }

  .dashboard-bar-row small {
    grid-column: 1 / -1;
    order: 4;
  }

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

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

  .shell {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
    border: 0;
    border-radius: 0;
    gap: 0;
  }

  .panel-left,
  .panel-center {
    border: 0;
  }

  .panel-header {
    padding: 0.875rem 0.875rem 0.625rem;
    background: transparent;
  }

  .panel-header h2 {
    font-size: 1.125rem;
  }

  .filters {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 0.125rem;
  }

  .filters .pill {
    flex: 0 0 auto;
    white-space: nowrap;
  }

  .search-box {
    margin: 0 0.75rem 0.625rem;
    padding: 0.75rem;
    border-radius: var(--radius);
  }

  .conversation-tags {
    display: none;
  }

  .conversation-card {
    padding: 0.75rem 0.875rem;
    gap: 0.75rem;
  }

  .conversation-card.active {
    box-shadow: inset 0.25rem 0 0 var(--accent);
  }

  .conversation-card.active::after {
    display: none;
  }

  .conversation-preview {
    margin-bottom: 0.35rem;
  }

  .conversation-secondary {
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
  }

  .chat-header {
    grid-template-columns: minmax(0, 1fr) auto;
    padding: calc(0.625rem + env(safe-area-inset-top)) 0.75rem 0.625rem;
  }

  .mobile-back-btn {
    display: grid;
  }

  .chat-contact {
    grid-column: 1;
    gap: 0.625rem;
  }

  .chat-copy {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "title"
      "meta"
      "chips";
  }

  .chat-window-state {
    margin-top: 0.18rem;
  }

  .chat-title {
    font-size: 0.9375rem;
  }

  .chat-meta {
    font-size: 0.75rem;
  }

  .chat-window-state {
    align-items: start;
    justify-items: start;
    gap: 0.18rem;
  }

  .chat-header-info-line {
    justify-content: flex-start;
    flex-wrap: nowrap;
    row-gap: 0.12rem;
    font-size: 0.68rem;
  }

  .chat-info-chip-icon {
    width: 1.28rem;
    height: 1.28rem;
  }

  .chat-info-chip-icon::before {
    inset: 0.24rem;
  }

  .chat-actions {
    grid-column: 2;
    flex-wrap: nowrap;
    justify-content: flex-end;
    gap: 0.25rem;
  }

  .chat-window {
    padding: 0.75rem 0.75rem 0.5rem;
  }

  .message {
    max-width: 88%;
  }

  .message.outbound {
    max-width: 88%;
  }

  .composer {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "attachment attachment"
      "utility utility"
      "field send";
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.625rem calc(0.625rem + env(safe-area-inset-bottom));
  }

  .composer-left {
    grid-area: utility;
    order: 0;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 0.125rem;
  }

  .composer-left .ghost {
    flex: 0 0 auto;
  }

  .composer-attachment {
    grid-area: attachment;
  }

  .composer-field {
    grid-area: field;
    gap: 0.5rem;
  }

  #attachBtn,
  #recordAudioBtn,
  #compactCalculatorBtn {
    width: 2.75rem;
    min-width: 2.75rem;
    height: 2.75rem;
    padding: 0;
    border-radius: 50%;
    display: grid;
    place-items: center;
  }

  #templateBtn,
  #compactCalculatorBtn {
    width: 2.75rem;
    min-width: 2.75rem;
    height: 2.75rem;
    padding: 0;
    border-radius: 50%;
    display: grid;
    place-items: center;
  }

  #recordAudioBtn.is-recording {
    width: 5.65rem;
    min-width: 5.65rem;
  }

  .emoji-toggle {
    width: 2.75rem;
    height: 2.75rem;
  }

  .composer-field input {
    min-height: 3rem;
    border-radius: 1.5rem;
    padding: 0.8125rem 1rem;
  }

  #sendBtn {
    grid-area: send;
    width: 3rem;
    height: 3rem;
    padding: 0;
    border-radius: 50%;
    font-size: 0;
  }

  .composer-attachment-card {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .composer-attachment-actions {
    grid-column: 1 / -1;
    justify-content: flex-end;
  }

  .composer-attachment-preview {
    width: 3.5rem;
    height: 3.5rem;
    min-height: 3.5rem;
  }

  .emoji-picker {
    left: 0;
    right: 0;
    width: auto;
    bottom: calc(100% + 0.5rem);
  }

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

  .system-health-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .health-card-wide {
    grid-column: span 2;
  }

  .integration-banner {
    grid-template-columns: 1fr;
  }

  .integration-signal-grid {
    grid-template-columns: 1fr;
  }

  .settings-inline-card {
    grid-template-columns: 1fr;
  }

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

  .art-card-head,
  .art-appearance-grid {
    grid-template-columns: 1fr;
  }

  .art-card-head {
    display: grid;
  }

  .settings-actions {
    width: 100%;
  }

  .settings-actions .ghost.small {
    flex: 1 1 12rem;
  }

  .is-mobile-hidden {
    display: none !important;
  }
}

@media (hover: none) {
  .nav-btn {
    max-width: none;
    justify-content: center;
  }

  .nav-copy {
    display: none;
  }
}