@media (max-width: 767px) {
  :root {
    --mobile-nav-height: 68px;
    --mobile-page-gutter: 12px;
  }

  html {
    scrollbar-gutter: auto;
    overflow-x: visible;
  }

  body {
    min-width: 0;
    min-height: 100svh;
    padding-bottom: calc(var(--mobile-nav-height) + env(safe-area-inset-bottom));
    overflow-x: visible;
  }

  #navbar.navbar,
  #navbar.horizontal-navbar {
    display: none !important;
  }

  .mobile-navbar {
    position: fixed;
    z-index: 1200;
    right: 0;
    bottom: 0;
    left: 0;
    display: grid !important;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    min-height: calc(var(--mobile-nav-height) + env(safe-area-inset-bottom));
    padding: 5px 6px max(5px, env(safe-area-inset-bottom));
    border-top: 1px solid var(--divider-color);
    background: color-mix(in srgb, var(--navbar-background) 94%, transparent);
    box-shadow: 0 -8px 24px rgba(0, 0, 0, .14);
    backdrop-filter: blur(14px);
    box-sizing: border-box;
  }

  .mobile-navbar * {
    box-sizing: border-box;
  }

  .mobile-nav-link {
    display: flex;
    min-width: 0;
    min-height: 54px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 3px;
    margin: 0;
    padding: 4px 2px;
    color: var(--navbar-text-color);
    border: 0;
    border-radius: 11px;
    background: transparent;
    box-shadow: none;
    font-size: .66rem;
    font-weight: 700;
    line-height: 1;
    text-decoration: none;
  }

  .mobile-nav-link i {
    font-size: 1.08rem;
    line-height: 1;
  }

  .mobile-nav-link:hover,
  .mobile-nav-link:focus-visible {
    color: var(--navbar-hover-text-color);
    background: var(--navbar-hover-background);
  }

  .mobile-nav-link.active,
  .mobile-nav-link[aria-current="page"] {
    color: var(--accent-text);
    background: var(--accent-deep);
    box-shadow: inset 0 0 0 1px var(--accent-border);
  }

  .mobile-nav-more {
    position: relative;
    min-width: 0;
  }

  .mobile-nav-more > summary {
    width: 100%;
    height: 100%;
    list-style: none;
    cursor: pointer;
  }

  .mobile-nav-more > summary::-webkit-details-marker {
    display: none;
  }

  .mobile-nav-menu {
    position: absolute;
    right: 0;
    bottom: calc(100% + 10px);
    display: grid;
    width: min(210px, calc(100vw - 24px));
    gap: 4px;
    padding: 7px;
    border: 1px solid var(--divider-color);
    border-radius: 14px;
    background: var(--container-background);
    box-shadow: 0 16px 38px rgba(0, 0, 0, .25);
  }

  .mobile-nav-menu .mobile-nav-link {
    min-height: 46px;
    align-items: center;
    justify-content: flex-start;
    flex-direction: row;
    gap: 10px;
    padding: 8px 12px;
    font-size: .88rem;
  }

  #flash-box {
    top: 12px;
    width: calc(100% - 24px);
  }

  #navbar.navbar ~ .site-content.container.mt-5.pt-5,
  #navbar.horizontal-navbar ~ .site-content.container.mt-5.pt-5,
  .site-content.container.mt-5.pt-5 {
    width: 100%;
    max-width: none;
    min-width: 0;
    margin: 0 !important;
    padding: var(--mobile-page-gutter) var(--mobile-page-gutter)
      calc(16px + env(safe-area-inset-bottom)) !important;
  }

  .site-content *,
  .site-content *::before,
  .site-content *::after {
    box-sizing: border-box;
  }

  .site-content img,
  .site-content svg,
  .site-content canvas {
    max-width: 100%;
  }

  .site-content input,
  .site-content select,
  .site-content textarea {
    max-width: 100%;
    font-size: 16px;
  }

  .site-content button,
  .site-content .btn {
    min-height: 44px;
  }

  .site-content .row {
    margin-right: 0;
    margin-left: 0;
  }

  .site-content .card,
  .site-content .table-responsive,
  .site-content form {
    min-width: 0;
    max-width: 100%;
  }

  .exercise-container {
    width: 100%;
    height: auto;
    min-height: 0;
    margin: 0 !important;
    padding: 20px 14px;
    border-radius: 16px;
  }

  /* Home */
  .page-views-home .home {
    min-height: 0;
  }

  .page-views-home .home-section {
    margin-bottom: 12px;
    padding: 12px;
    border-radius: 14px;
  }

  .page-views-home .home-section__title {
    margin-bottom: 10px;
    font-size: 1.2rem;
  }

  .page-views-home .home-grid,
  .page-views-home .home-grid--calculus {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .page-views-home .home-tile {
    min-width: 0;
    min-height: 92px;
    aspect-ratio: 1.35 / 1;
    border-radius: 13px;
  }

  .page-views-home .home-tile__symbol {
    font-size: 1.8rem;
  }

  .page-views-home .home-tile__label {
    font-size: .72rem;
  }

  .page-views-home .home-fab {
    right: 12px;
    bottom: calc(var(--mobile-nav-height) + env(safe-area-inset-bottom) + 12px);
    min-height: 44px;
  }

  /* Arithmetic exercise pages */
  .page-views-addition .exercise-container,
  .page-views-subtraction .exercise-container,
  .page-views-multiplication .exercise-container,
  .page-views-division .exercise-container {
    min-height: min(620px, calc(100svh - var(--mobile-nav-height) - 28px));
    justify-content: center;
    padding: 58px 12px 18px;
  }

  .page-views-addition .exercise-container > h1,
  .page-views-subtraction .exercise-container > h1,
  .page-views-multiplication .exercise-container > h1,
  .page-views-division .exercise-container > h1 {
    max-width: 100%;
    margin: 0 0 16px;
    font-size: clamp(2.5rem, 14vw, 4rem) !important;
    line-height: 1.1;
    overflow-wrap: anywhere;
  }

  .page-views-addition #timer,
  .page-views-subtraction #timer,
  .page-views-multiplication #timer,
  .page-views-division #timer {
    top: 24px !important;
    right: 18px !important;
    font-size: 1.45rem !important;
    font-variant-numeric: tabular-nums;
  }

  .page-views-addition #answer-form,
  .page-views-subtraction #answer-form,
  .page-views-multiplication #answer-form,
  .page-views-division #answer-form {
    display: grid;
    width: 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .page-views-addition #answer-form > label,
  .page-views-addition #answer-container,
  .page-views-addition #blocks-container,
  .page-views-subtraction #answer-form > label,
  .page-views-subtraction #answer-container,
  .page-views-subtraction #blocks-container,
  .page-views-multiplication #answer-form > label,
  .page-views-multiplication #answer-container,
  .page-views-multiplication #blocks-container,
  .page-views-division #answer-form > label,
  .page-views-division #answer-container,
  .page-views-division #blocks-container,
  .page-views-addition #answer-form > button[type="submit"],
  .page-views-subtraction #answer-form > button[type="submit"],
  .page-views-multiplication #answer-form > button[type="submit"],
  .page-views-division #answer-form > button[type="submit"] {
    grid-column: 1 / -1;
  }

  .page-views-addition #answer-container,
  .page-views-subtraction #answer-container,
  .page-views-multiplication #answer-container,
  .page-views-division #answer-container {
    width: 100%;
    height: 64px !important;
    min-height: 64px;
    margin: 0 !important;
    padding: 8px !important;
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .page-views-addition #blocks-container,
  .page-views-subtraction #blocks-container,
  .page-views-multiplication #blocks-container,
  .page-views-division #blocks-container {
    display: grid !important;
    width: 100%;
    grid-template-columns: repeat(5, minmax(44px, 1fr));
    gap: 7px;
    margin: 4px 0 !important;
    padding: 9px !important;
  }

  .page-views-addition #blocks-container .draggable,
  .page-views-subtraction #blocks-container .draggable,
  .page-views-multiplication #blocks-container .draggable,
  .page-views-division #blocks-container .draggable {
    display: flex;
    min-width: 44px;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    margin: 0;
    padding: 0;
  }

  .page-views-addition #answer-form > button,
  .page-views-subtraction #answer-form > button,
  .page-views-multiplication #answer-form > button,
  .page-views-division #answer-form > button {
    width: 100%;
    margin: 0;
    padding: 9px 6px;
  }

  .page-views-addition .result-message,
  .page-views-subtraction .result-message,
  .page-views-multiplication .result-message,
  .page-views-division .result-message {
    min-height: 32px;
    margin-top: 8px;
    font-size: 1.15rem;
  }

  .page-views-addition .progress-bar-container,
  .page-views-subtraction .progress-bar-container,
  .page-views-multiplication .progress-bar-container,
  .page-views-division .progress-bar-container {
    margin: 12px 0 0;
  }

  .page-views-addition .progress-bar,
  .page-views-subtraction .progress-bar,
  .page-views-multiplication .progress-bar,
  .page-views-division .progress-bar {
    width: 100%;
  }

  /* Progress */
  .page-views-progress .pg-title {
    margin: 0 0 10px;
    font-size: 1.65rem;
    line-height: 1.15;
  }

  .page-views-progress .pg-btn-group {
    display: flex;
    width: 100%;
    max-width: 100%;
    gap: 4px;
    margin-bottom: 12px;
    padding: 4px;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scroll-snap-type: inline proximity;
    -webkit-overflow-scrolling: touch;
  }

  .page-views-progress .pg-btn {
    min-width: max-content;
    min-height: 44px;
    flex: 0 0 auto;
    padding: 8px 12px;
    scroll-snap-align: start;
  }

  .page-views-progress .pg-canvas-wrap {
    width: 100%;
    padding: 7px 5px 3px;
    border-radius: 12px;
  }

  .page-views-progress #progressChart {
    width: 100% !important;
    height: clamp(310px, 50svh, 410px) !important;
  }

  /* Leaderboard */
  .page-views-leaderboard .lb-wrap {
    width: 100%;
    max-width: none !important;
    padding: 0 !important;
  }

  .page-views-leaderboard .lb-head {
    padding: 18px 14px 10px;
  }

  .page-views-leaderboard .lb-title {
    font-size: 1.55rem;
  }

  .page-views-leaderboard .lb-controls {
    align-items: stretch;
    gap: 9px;
    padding: 10px 12px 0;
  }

  .page-views-leaderboard .seg-group {
    display: flex;
    width: 100%;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    -webkit-overflow-scrolling: touch;
  }

  .page-views-leaderboard .seg-btn {
    min-width: max-content;
    min-height: 44px;
    flex: 0 0 auto;
    padding: 9px 12px;
  }

  .page-views-leaderboard .lb-search {
    width: 100%;
    min-height: 46px;
  }

  .page-views-leaderboard .lb-status {
    margin: 9px 12px 7px;
  }

  .page-views-leaderboard .lb-table-wrap {
    max-width: 100%;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    -webkit-overflow-scrolling: touch;
  }

  .page-views-leaderboard #lb-grid {
    min-width: 500px;
  }

  .page-views-leaderboard tbody td,
  .page-views-leaderboard tbody th,
  .page-views-leaderboard thead th {
    padding: 10px 9px;
  }

  .page-views-leaderboard tbody td:nth-child(2) {
    max-width: 150px;
    overflow-wrap: anywhere;
  }

  /* Profile */
  .page-views-profile .pv-container {
    padding: 0;
  }

  .page-views-profile .pv-hero {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 7px;
    margin: 0 0 12px;
    padding: 8px;
  }

  .page-views-profile .pv-btn {
    min-height: 44px;
    justify-content: center;
    padding: 8px 6px;
    font-size: .78rem;
  }

  .page-views-profile .pv-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .page-views-profile .pv-card__header,
  .page-views-profile .pv-card__body {
    padding: 14px;
  }

  .page-views-profile .pv-card__header--split {
    align-items: flex-start;
    flex-direction: column;
  }

  .page-views-profile .pv-list li {
    grid-template-columns: 22px minmax(0, 1fr);
  }

  .page-views-profile .pv-list li > strong {
    grid-column: 2;
    overflow-wrap: anywhere;
    text-align: left;
  }

  .page-views-profile .pv-tiles {
    gap: 8px;
  }

  .page-views-profile .pv-tile {
    padding: 11px;
  }

  /* Forms, settings, donations and compact states */
  .page-views-settings .exercise-container {
    align-items: stretch;
    padding: 20px 16px;
    text-align: left;
  }

  .page-views-settings .desktop-layout-setting {
    display: none;
  }

  .page-views-settings #theme-select {
    width: 100%;
    max-width: none !important;
    min-height: 48px;
  }

  .page-views-edit_profile form {
    width: 100%;
  }

  .page-payments-donate .d-flex.my-5 {
    margin-top: 0 !important;
    margin-bottom: 0 !important;
  }

  .page-payments-donate .donate-card .card-body {
    padding: 22px !important;
  }

  .page-payments-donate .donate-card h2 {
    font-size: 1.8rem !important;
  }

  .site-content > div[style*="max-width:560px"] {
    margin: 28px auto !important;
    padding: 16px;
  }

  .site-content > div[style*="max-width:600px"] {
    max-width: 100% !important;
    margin: 28px auto !important;
    padding: 16px;
  }

  .summary-container {
    width: 100%;
    height: min(620px, calc(100svh - var(--mobile-nav-height) - 24px)) !important;
    min-height: 420px;
  }

  .summary-container .rating-container {
    margin-bottom: 12px;
    font-size: 4rem;
  }

  .summary-container .arrow {
    right: -36px;
    font-size: 3rem;
  }

  .summary-container .button-container {
    display: flex;
    width: 100%;
    max-width: 320px;
    gap: 8px;
    margin-top: 12px;
  }

  .summary-container .button-container .btn {
    flex: 1;
    margin: 0;
  }

  /* Integration */
  #navbar.navbar ~ .site-content .integration-shell,
  #navbar.horizontal-navbar ~ .site-content .integration-shell,
  .page-views-integration .integration-shell {
    width: 100%;
    min-height: 0;
    margin: 0;
    --flow-gap: 8px;
    --card-pad-x: 10px;
    --card-pad-y: 8px;
    --key-size: 44px;
  }

  .page-views-integration .exercise-hero {
    min-height: clamp(8.25rem, 19svh, 10rem);
    padding: 8px 10px;
    border-radius: 13px;
  }

  .page-views-integration .exercise-eyebrow {
    margin-bottom: 0;
    font-size: .63rem;
  }

  .page-views-integration .exercise-math {
    --formula-size: clamp(1.55rem, 9.5vw, 2.65rem);
    --formula-tight-size: clamp(1.3rem, 7.8vw, 2.2rem);
    min-height: clamp(6.5rem, 15svh, 8.25rem);
    padding: 0 2px;
    justify-items: safe center;
    -webkit-overflow-scrolling: touch;
  }

  .page-views-integration .exercise-math[data-formula-density="short"] {
    --formula-size: clamp(1.75rem, 10.5vw, 2.9rem);
    --formula-tight-size: clamp(1.5rem, 8.8vw, 2.45rem);
  }

  .page-views-integration .answer-workspace {
    padding: 8px;
    border-radius: 13px;
  }

  .page-views-integration .answer-header {
    gap: 7px;
    margin-bottom: 6px;
  }

  .page-views-integration .your-answer-label {
    min-width: 0;
    font-size: .86rem;
    white-space: normal;
    text-align: left;
  }

  .page-views-integration .pretty-math {
    width: auto;
    max-width: 52%;
    min-height: 1.45rem;
    margin-left: auto;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    text-overflow: clip;
    white-space: nowrap;
  }

  .page-views-integration .answer-container {
    min-height: 78px;
    max-height: 104px;
    justify-content: flex-start;
    flex-wrap: nowrap;
    gap: 6px;
    padding: 9px 11px !important;
    overflow-x: auto;
    overflow-y: hidden;
    overscroll-behavior-inline: contain;
    scroll-behavior: smooth;
    scrollbar-width: thin;
    touch-action: pan-x;
    -webkit-overflow-scrolling: touch;
    background:
      linear-gradient(to right, var(--container-background) 68%, transparent) left center / 22px 100% no-repeat local,
      linear-gradient(to left, var(--container-background) 68%, transparent) right center / 22px 100% no-repeat local,
      linear-gradient(to right, rgba(15, 23, 42, .18), transparent) left center / 18px 100% no-repeat scroll,
      linear-gradient(to left, rgba(15, 23, 42, .18), transparent) right center / 18px 100% no-repeat scroll,
      var(--container-background);
  }

  .dark-theme .page-views-integration .answer-container {
    background:
      linear-gradient(to right, var(--container-background) 68%, transparent) left center / 22px 100% no-repeat local,
      linear-gradient(to left, var(--container-background) 68%, transparent) right center / 22px 100% no-repeat local,
      linear-gradient(to right, rgba(255, 255, 255, .16), transparent) left center / 18px 100% no-repeat scroll,
      linear-gradient(to left, rgba(255, 255, 255, .16), transparent) right center / 18px 100% no-repeat scroll,
      var(--container-background);
  }

  .page-views-integration .answer-container > .draggable {
    flex: 0 0 auto;
  }

  .page-views-integration .blocks-trash-wrapper {
    grid-template-columns: minmax(0, 1fr) !important;
    grid-template-rows: auto;
    grid-template-areas: "controls" "feedback" "keypad";
    gap: 6px !important;
    margin-top: 6px !important;
  }

  .page-views-integration .side-controls {
    position: sticky;
    z-index: 110;
    bottom: calc(var(--mobile-nav-height) + env(safe-area-inset-bottom) + 6px);
    display: grid;
    grid-template-columns: minmax(104px, .9fr) 44px minmax(0, 1.45fr);
    grid-template-areas: "primary trash actions";
    gap: 5px;
    padding: 6px;
    border: 1px solid var(--divider-color);
    border-radius: 12px;
    background: color-mix(in srgb, var(--container-background) 94%, transparent);
    box-shadow: 0 10px 24px rgba(0, 0, 0, .16);
    backdrop-filter: blur(12px);
  }

  .page-views-integration .primary-check {
    grid-area: primary;
    min-height: 44px;
  }

  .page-views-integration .trash-container {
    grid-area: trash;
    width: 44px;
    height: 44px;
    min-height: 44px;
    margin: 0;
    font-size: 18px;
  }

  .page-views-integration .trash-hint {
    display: none;
  }

  .page-views-integration .actions {
    grid-area: actions;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px;
  }

  .page-views-integration .actions button {
    min-height: 44px;
    padding: 5px 3px;
    font-size: .68rem;
  }

  .page-views-integration .answer-feedback {
    min-height: 54px;
    margin: 0;
    padding: 8px 10px;
    border-radius: 10px;
  }

  .page-views-integration .answer-feedback h2 {
    margin-bottom: 1px;
    font-size: 1rem;
  }

  .page-views-integration .correct-answer-line {
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .page-views-integration .kb-panel {
    width: 100%;
    padding: 6px;
    border-radius: 11px;
  }

  .page-views-integration .keypad-heading {
    min-height: 44px;
    margin-bottom: 4px;
  }

  .page-views-integration .keypad-title {
    margin: 0;
    font-size: .76rem;
  }

  .page-views-integration .keyboard-help-panel {
    right: 0;
    width: min(19rem, calc(100vw - 40px));
  }

  .page-views-integration .keypad-tabs {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 5px;
    margin-bottom: 6px;
  }

  .page-views-integration .keypad-tab {
    min-height: 44px;
    margin: 0;
    padding: 6px 4px;
    color: var(--text-color);
    border: 1px solid var(--divider-color);
    border-radius: 9px;
    background: var(--block-background);
    box-shadow: none;
    font-size: .72rem;
    font-weight: 750;
  }

  .page-views-integration .keypad-tab[aria-selected="true"] {
    color: var(--accent-text);
    border-color: var(--accent-border);
    background: var(--accent-deep);
  }

  .page-views-integration #blocks-container.palette4 {
    width: 100%;
    min-height: 108px;
    grid-template-columns: minmax(0, 1fr) !important;
    margin: 0;
    padding: 8px 6px !important;
    overflow: hidden;
  }

  .page-views-integration #blocks-container.palette4 .mobile-keypad-panel-hidden {
    display: none !important;
  }

  .page-views-integration #blocks-container.palette4 .col-op,
  .page-views-integration #blocks-container.palette4 .col-num {
    grid-column: 1;
    grid-row: 1;
    grid-template-columns: repeat(6, 44px);
    grid-auto-rows: 44px;
    gap: 5px;
    justify-content: center;
  }

  .page-views-integration #blocks-container.palette4 .col-fn {
    grid-column: 1;
    grid-row: 1;
    grid-template-columns: repeat(7, 44px) !important;
    grid-auto-rows: 44px;
    gap: 5px;
    justify-content: start;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
  }

  .page-views-integration #blocks-container.palette4 .draggable {
    width: 44px;
    min-width: 44px;
    height: 44px;
  }

  .page-views-integration .advanced-functions {
    grid-column: 1 / -1;
    width: 100%;
  }

  .page-views-integration .advanced-functions > summary {
    min-height: 44px;
  }

  .page-views-integration .advanced-functions-grid {
    grid-template-columns: repeat(6, 44px);
    gap: 5px;
    justify-content: start;
  }
}

@media (max-width: 390px) {
  :root {
    --mobile-page-gutter: 10px;
  }

  .page-views-profile .pv-tiles {
    grid-template-columns: 1fr;
  }

  .page-views-integration .side-controls {
    grid-template-columns: minmax(96px, .9fr) 44px minmax(0, 1.35fr);
  }
}