.model-picker-container {
  display: flex !important;
}

.mobile-panel-toggle {
  display: none;
}

.mobile-panel-content {
  display: contents;
}

@media (max-width: 900px) {
  html,
  body {
    height: auto;
    min-height: 100%;
    overflow-x: hidden;
    overflow-y: auto;
  }

  body {
    min-height: 100svh;
  }

  header {
    position: relative;
  }

  .hdr-sep,
  .stb-sep,
  .panel-footer {
    display: none;
  }

  .panel-resizer {
    display: none !important;
  }

  .hdr-left,
  .hdr-center,
  .hdr-right {
    width: 100%;
  }

  .hdr-right {
    gap: 6px;
    padding-bottom: 12px;
  }

  .hbtn {
    flex: 0 0 auto;
  }

  .sub-toolbar {
    flex-wrap: nowrap;
    justify-content: flex-start;
    overflow-x: auto;
    overflow-y: visible;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .model-picker-container {
    flex: 0 0 auto;
    width: auto;
  }

  .model-picker-btn {
    min-width: 140px;
    height: 32px;
    padding: 0 8px;
  }

  .sub-toolbar .hbtn {
    min-height: 32px;
  }

  .mobile-panel-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    width: 100%;
    padding: 10px 14px;
    background: var(--bg2);
    border: 0;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    font-family: var(--mono);
    font-size: .72rem;
    letter-spacing: .06em;
    text-transform: uppercase;
    cursor: pointer;
  }

  .mobile-panel-title {
    min-width: 0;
  }

  .mobile-panel-icon {
    color: var(--text3);
    font-size: .85rem;
    transition: transform var(--transition-fast), color var(--transition-fast);
    flex: 0 0 auto;
  }

  .machine-tabs {
    display: none;
  }

  .app-body,
  .view-container,
  #v-build,
  #v-algo,
  #v-grammar,
  #v-theory {
    display: flex;
    flex-direction: column;
    flex: 0 0 auto;
    overflow: visible;
    min-width: 0;
    min-height: 0;
  }

  .lpanel,
  .rpanel,
  .algo-nav,
  .gram-left,
  .theory-nav {
    width: 100% !important;
    min-width: 0 !important;
    max-height: none;
    border-left: 0;
    border-right: 0;
    box-shadow: none;
  }

  .mobile-panel-content {
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
  }

  #lpanel[data-mobile-collapsed="1"] > .mobile-panel-content,
  #rpanel[data-mobile-collapsed="1"] > .mobile-panel-content,
  #algo-nav[data-mobile-collapsed="1"] > .mobile-panel-content,
  #gram-left[data-mobile-collapsed="1"] > .mobile-panel-content,
  #theory-nav[data-mobile-collapsed="1"] > .mobile-panel-content {
    display: none;
  }

  #lpanel[data-mobile-collapsed="1"] .mobile-panel-icon,
  #rpanel[data-mobile-collapsed="1"] .mobile-panel-icon,
  #algo-nav[data-mobile-collapsed="1"] .mobile-panel-icon,
  #gram-left[data-mobile-collapsed="1"] .mobile-panel-icon,
  #theory-nav[data-mobile-collapsed="1"] .mobile-panel-icon {
    transform: rotate(-90deg);
    color: var(--text2);
  }

  .lpanel,
  .algo-nav,
  .gram-left,
  .theory-nav {
    border-bottom: 1px solid var(--border);
  }

  .rpanel {
    border-top: 1px solid var(--border);
  }

  .lpanel.unpinned,
  .lpanel.unpinned:not(:hover),
  .rpanel.unpinned,
  .rpanel.unpinned:not(:hover) {
    position: relative;
    top: auto;
    right: auto;
    left: auto;
    height: auto;
    width: 100%;
    min-width: 0;
    box-shadow: none;
  }

  .lpanel.unpinned::after,
  .rpanel.unpinned::before {
    display: none;
  }

  .lpanel.unpinned .lpanel-content,
  .lpanel.unpinned:not(:hover) .lpanel-content,
  .rpanel.unpinned > :not(style),
  .rpanel.unpinned:not(:hover) > :not(style) {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .lpanel-content,
  .rpanel-content,
  .algo-content,
  .gram-right {
    overflow: visible;
  }

  #lpanel[data-mobile-collapsed="1"],
  #rpanel[data-mobile-collapsed="1"],
  #algo-nav[data-mobile-collapsed="1"],
  #gram-left[data-mobile-collapsed="1"],
  #theory-nav[data-mobile-collapsed="1"] {
    flex: 0 0 auto;
    height: auto;
    min-height: 0;
    max-height: none;
    overflow: hidden;
  }

  .canvas-area {
    min-height: clamp(320px, 52svh, 560px);
    height: clamp(320px, 52svh, 560px);
  }

  .status {
    left: 12px;
    right: 12px;
    top: 12px;
    transform: none;
    max-width: none;
    white-space: normal;
    text-align: center;
    line-height: 1.5;
  }

  .canvas-toolbox {
    left: 12px;
    right: 12px;
    bottom: 12px;
    top: auto;
    transform: none;
    width: auto;
    gap: 6px;
    max-width: none;
    overflow-x: auto;
    padding: 6px 8px;
    border-radius: 18px;
    justify-content: flex-start;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .canvas-toolbox[data-dock="top"],
  .canvas-toolbox[data-dock="bottom"] {
    flex-direction: row;
    align-items: center;
    min-width: 0;
    padding: 6px 8px;
  }

  .canvas-toolbox[data-dock="left"],
  .canvas-toolbox[data-dock="right"] {
    flex-direction: row;
    align-items: center;
    min-width: 0;
    padding: 6px 8px;
  }

  .toolbox-grip {
    width: 28px;
    min-height: 28px;
  }

  .canvas-toolbox[data-dock="top"] .toolbox-grip,
  .canvas-toolbox[data-dock="bottom"] .toolbox-grip,
  .canvas-toolbox[data-dock="floating"] .toolbox-grip {
    width: 28px;
    min-height: 28px;
    margin-right: 2px;
  }

  .canvas-toolbox[data-dock="top"] .toolbox-btn,
  .canvas-toolbox[data-dock="bottom"] .toolbox-btn {
    min-width: 58px;
    padding: 7px 9px;
  }

  .canvas-toolbox::-webkit-scrollbar,
  .sub-toolbar::-webkit-scrollbar,
  .machine-tabs::-webkit-scrollbar,
  .nav-tabs::-webkit-scrollbar,
  .hdr-right::-webkit-scrollbar {
    display: none;
  }

  .toolbox-btn {
    min-width: 50px;
    padding: 7px 8px;
  }

  .toolbox-kbd,
  .minimap-container,
  .minimap-show-btn,
  .canvas-hint,
  .zoom-indicator {
    display: none !important;
  }

  .toolbox-sep {
    width: 1px;
    height: auto;
    margin: 0 2px;
  }

  .canvas-nav-controls {
    top: 12px;
    right: 12px;
    bottom: auto;
  }

  .code-box,
  .def-box {
    max-width: none;
  }

  .algo-content,
  .gram-right {
    padding: 16px 14px;
  }

  .algo-content .card,
  .gram-right .card,
  .pump-section,
  .hierarchy-section,
  .theory-card,
  .grammar-display,
  .info-box {
    overflow-x: auto;
  }

  .card,
  .pump-section,
  .hierarchy-section,
  .theory-card {
    padding: 14px;
  }

  .algo-content [style*="display:flex"],
  .gram-right [style*="display:flex"],
  #v-theory .algo-content [style*="display:flex"] {
    flex-wrap: wrap;
  }

  #utm-tape-wrap,
  .tape-wrap,
  .canvas-toolbox,
  .canvas-nav-controls,
  .machine-tabs,
  .nav-tabs,
  .hdr-right,
  .sctrl {
    flex-wrap: nowrap !important;
  }

  .row,
  .sim-row,
  .regex-input-wrap,
  .pump-row,
  .modal-row,
  .modal-foot,
  .about-row {
    flex-wrap: wrap;
  }

  .sim-row .run-btn,
  .regex-input-wrap .algo-btn,
  .algo-content .algo-btn,
  .modal-foot .btn-g,
  .modal-foot .btn-p {
    width: 100%;
    margin-right: 0;
  }

  .sctrl {
    overflow-x: auto;
  }

  .sbtn {
    flex: 0 0 auto;
    min-width: 72px;
  }

  .algo-search-wrap {
    position: static;
  }

  .algo-nav .mobile-panel-toggle,
  .gram-left .mobile-panel-toggle,
  .theory-nav .mobile-panel-toggle {
    position: sticky;
    top: 0;
    z-index: 2;
  }

  .algo-item,
  .theory-nav-link {
    padding-right: 12px;
  }

  .theory-nav-header {
    padding-bottom: 10px;
  }

  .theory-section {
    margin-bottom: 24px;
  }

  .theory-section-title {
    gap: 8px;
    font-size: 1rem;
  }

  .theory-section-sub,
  .tc-sub {
    line-height: 1.5;
  }

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

  .pump-lbl,
  .modal-lbl,
  .about-lbl {
    min-width: 0;
    width: 100%;
  }

  .pump-row .inp,
  .modal-row .inp,
  .modal-row .sel {
    flex: 1 1 140px;
  }

  .help-table td:first-child {
    width: 84px;
  }

  .help-table td,
  .result-table th,
  .result-table td,
  .dec-table th,
  .dec-table td,
  .cyk-cell,
  .min-table th,
  .min-table td {
    padding: 6px 8px;
  }

  .result-table,
  .dec-table,
  .help-table,
  .cyk-table,
  .min-table {
    font-size: .66rem;
  }

  .parse-tree-svg,
  .algo-content svg,
  .gram-right svg {
    max-width: 100%;
    height: auto;
  }

  textarea,
  .batch-in {
    width: 100%;
    max-width: 100%;
  }

  #v-theory .algo-content[style] {
    padding: 16px 14px !important;
  }
}

@media (max-width: 640px) {
  .hdr-left {
    padding-bottom: 6px;
  }

  .logo {
    font-size: 1rem;
  }

  .nav-btn {
    padding: 0 12px;
  }

  .mobile-machine-select {
    flex-basis: 108px;
    min-width: 108px;
    max-width: 108px;
  }

  .hbtn {
    font-size: .64rem;
    padding: 5px 8px;
  }

  .toolbox-lbl {
    font-size: .55rem;
  }

  .cnc-zoom-input {
    width: 38px;
  }

  .canvas-area {
    min-height: clamp(280px, 46svh, 460px);
    height: clamp(280px, 46svh, 460px);
  }

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

  .modal {
    padding: 18px 16px;
    min-width: 0;
    width: calc(100% - 20px);
  }
}