/* Phone layout approved 11 October 2026. Desktop rules live in styles.css. */
@media (max-width: 679.98px) {
  .guide-app::before {
    background: var(--background-top-veil),
      var(--background-side-veil),
      var(--color-canvas) url("../assets/images/guide-background.webp") var(--mobile-background-position) / cover no-repeat;
    opacity: var(--mobile-veil-opacity);
  }

  .guide-shell-logo {
    width: 100px;
  }

  .guide-shell-header {
    position: static;
    height: 64px;
    padding-top: 12px;
  }

  .guide-app {
    padding-top: 0px;
  }

  .guide-shell-navigation {
    grid-template-columns: minmax(0px, 1fr) 24px minmax(0px, 1fr);
    gap: 12px;
  }

  .guide-shell-navigation .guide-button {
    min-width: 0px;
    font-size: 1.0625rem;
    min-height: max(52px, 3.25rem);
    padding-inline: 12px;
  }

  .guide-shell-footer.is-welcome .guide-forward-button {
    font-size: 1.125rem;
  }

  .welcome-screen {
    align-items: start;
  }

  .welcome-layout {
    grid-template-columns: minmax(0px, 1fr);
    gap: 0px;
    width: min(calc(100% - 2 * var(--screen-gutter)), var(--layout-max-width));
    padding: 24px 0px;
  }

  .welcome-content {
    display: contents;
  }

  .welcome-title {
    grid-row: 1;
    color: var(--color-heading);
    flex: 0 0 auto;
    order: 1;
    width: 100%;
    max-width: 100%;
    font-size: 1.875rem;
    line-height: 1.16;
  }

  .welcome-product-kind {
    line-height: 1.12;
    font-size: inherit;
  }

  .welcome-description {
    grid-row: 2;
    flex: 0 0 auto;
    margin-top: 6px;
    order: 2;
    margin: 12px 0px 0px;
    font-size: 1.0625rem;
    line-height: 1.5;
  }

  .welcome-device {
    grid-row: 4;
    width: 100%;
    display: grid;
    place-items: center;
    container-type: size;
    order: 3;
    flex: 1 0 250px;
    min-height: 250px;
    margin-top: 16px;
  }

  .welcome-subtitle {
    grid-row: 3;
    justify-self: start;
    color: var(--color-brand);
    letter-spacing: -0.015em;
    text-align: left;
    flex: 0 0 auto;
    order: 0;
    margin: 0px 0px 10px;
    font-size: 1.125rem;
    line-height: 1.35;
  }

  .welcome-subtitle-desktop {
    display: none;
  }

  .welcome-subtitle-mobile {
    display: inline;
  }

  .has-shared-heading-position .welcome-layout {
    padding-top: var(--guide-heading-offset);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    height: var(--mobile-page-height);
    min-height: min-content;
    padding: 20px 0px 16px;
    gap: 0px;
  }

  .has-shared-heading-position .welcome-content {
    padding-top: 0px;
  }

  .upgrade-dialog-header {
    padding: 20px 20px 16px;
  }

  .upgrade-dialog-close {
    top: 16px;
    right: 16px;
    width: 44px;
    height: 44px;
  }

  .upgrade-dialog-header .guide-step-label {
    font-size: 0.875rem;
  }

  #upgrade-instruction-summary {
    font-size: 0.875rem;
    line-height: 1.5;
  }

  .upgrade-step-navigation {
    margin-top: 16px;
    gap: 8px;
  }

  .upgrade-step-navigation button {
    max-width: 52px;
    flex: 1 1 0%;
    min-width: 44px;
    min-height: 44px;
  }

  .upgrade-dialog-tools {
    gap: 12px;
    margin-top: 16px;
  }

  .upgrade-dialog-tools .upgrade-step-navigation {
    margin-top: 0px;
    flex: 1 1 100%;
    min-width: 0px;
  }

  .upgrade-dd-help {
    margin-left: 0px;
    width: 100%;
  }

  .dd-version-summary {
    font-size: 0.875rem;
    line-height: 1.5;
  }

  .dd-screen-illustration {
    padding: 12px;
  }

  .upgrade-dialog-body {
    padding: 20px 16px;
  }

  .upgrade-step {
    grid-template-columns: minmax(0px, 1fr);
    gap: 20px;
    min-height: 0px;
  }

  .upgrade-step-copy {
    padding-top: 0px;
  }

  .upgrade-step h3 {
    overflow-wrap: anywhere;
    font-size: 1.625rem;
    margin-bottom: 12px;
  }

  .upgrade-illustration {
    padding: 20px 14px;
    min-height: 220px;
  }

  .upgrade-flow {
    flex-flow: row;
    gap: 10px;
  }

  .upgrade-flow-node {
    flex: 1 1 0%;
    min-width: 0px;
    width: auto;
    min-height: 72px;
    padding: 10px 8px;
    font-size: 1rem;
  }

  .upgrade-flow-node small {
    font-size: 0.875rem;
  }

  .upgrade-flow-arrow {
    transform: none;
    flex: 0 0 auto;
    font-size: 1.5rem;
  }

  .upgrade-flow-file-pair {
    width: min(100%, 240px);
    flex: 1 1 0%;
    min-width: 0px;
    gap: 8px;
  }

  .upgrade-dialog-controls {
    gap: 8px;
    padding: 12px 20px calc(12px + env(safe-area-inset-bottom, 0px));
  }

  .upgrade-dialog-controls .guide-button {
    min-width: 88px;
    padding: 10px 16px;
    font-size: 1.0625rem;
    min-height: max(52px, 3.25rem);
  }

  .guide-screen {
    align-items: start;
  }

  .guide-screen:not(.is-measuring) {
    height: auto;
    overflow: visible;
    display: block;
  }

  .guide-layout {
    grid-template-columns: minmax(0px, 1fr);
    gap: 36px;
    width: min(calc(100% - 2 * var(--screen-gutter)), var(--layout-max-width));
    padding: 24px 0px;
  }

  .guide-button {
    border-radius: 10px;
  }

  .initialization-media {
    grid-template-columns: minmax(0px, 1fr);
    width: min(100%, 420px);
    gap: 24px;
  }

  .initialization-device-image {
    width: min(100%, 240px);
    max-height: 300px;
    margin-inline: auto;
  }

  .guide-media-frame {
    padding: 6px;
    border-radius: 14px;
  }

  .guide-sound-button {
    right: 16px;
    bottom: 16px;
    width: 48px;
    height: 48px;
  }

  .guide-connection-card-header {
    min-height: 56px;
    padding: 10px 14px;
  }

  .guide-connection-card-footer {
    padding: 12px 14px 14px;
  }

  .guide-connection-caption {
    min-height: 72px;
    font-size: 1.0625rem;
    line-height: 1.45;
  }

  .guide-connection-card-footer .guide-media-cues {
    gap: 6px;
  }

  .guide-shell-navigation .guide-forward-button.is-replay {
    padding-inline: 4px;
  }

  .guide-media-cues {
    gap: 6px;
  }

  .guide-media-cues .guide-action-button {
    flex: 1 1 0%;
    padding-inline: 7px;
    min-height: 48px;
    font-size: 1rem;
  }

  .guide-open-media {
    width: 100%;
    height: auto;
    container-type: size;
    flex: 1 0 300px;
    min-height: 300px;
    padding: 0px;
    align-items: center;
  }

  .setup-done-mobile-punctuation {
    display: inline;
  }

  .setup-done-desktop-greeting {
    display: none;
  }

  :root {
    --mobile-heading-gap: 28.4px;
    --screen-gutter: 20px;
    --shell-header-height: 64px;
    --shell-footer-height: calc(max(52px, 3.25rem) + 24px + env(safe-area-inset-bottom, 0px));
    --mobile-page-height: calc(100svh - var(--shell-header-height) - var(--shell-footer-height));
  }

  .guide-shell-footer {
    padding-block: 12px calc(12px + env(safe-area-inset-bottom, 0px));
  }

  .guide-shell-footer.is-welcome {
    padding-top: 12px;
  }

  .guide-screen:not(.is-measuring) .guide-layout {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    height: var(--mobile-page-height);
    min-height: min-content;
    gap: 20px;
    padding-block: 16px;
  }

  .has-shared-heading-position .guide-screen:not(.is-measuring) .guide-content {
    flex: 0 0 auto;
    padding-top: 0px;
  }

  .guide-screen:not(.is-measuring) .guide-step-label {
    margin-bottom: 8px;
    font-size: 0.875rem;
    line-height: 1.4;
  }

  .guide-screen:not(.is-measuring) .guide-title {
    overflow-wrap: anywhere;
    font-size: 2rem;
    line-height: 1.15;
    margin-bottom: 12px;
  }

  .guide-screen:not(.is-measuring) .guide-lead-line:last-child {
    margin-bottom: 8px;
  }

  .guide-screen:not(.is-measuring) .guide-description {
    overflow-wrap: anywhere;
    font-size: 1.0625rem;
    line-height: 1.5;
  }

  .guide-screen:not(.is-measuring) .guide-description + .guide-description {
    margin-top: 6px;
  }

  #device-information .guide-description, #basic-setup-complete .guide-description {
    margin-top: 0px;
  }

  .sensor-installation-description-end {
    display: block;
  }

  .guide-screen .guide-media {
    width: 100%;
    justify-self: center;
  }

  .guide-screen .guide-media-frame {
    margin-inline: auto;
    justify-self: center;
  }

  #sensor-installation .guide-media {
    flex: 1 0 auto;
    align-items: center;
  }

  .guide-open-media .trex-photo-panel {
    width: min(100%, 70vw, 260px);
  }

  /* Steps 4–9 share the measured tallest copy and a fixed device size. */
  .guide-screen:not(.is-measuring):has(.trex-media.guide-open-media) .guide-layout {
    display: grid;
    grid-template-rows: max-content max-content;
    align-items: start;
    align-content: start;
    height: auto;
    min-height: var(--mobile-page-height);
    row-gap: 8px;
  }

  .guide-screen:has(.trex-media.guide-open-media) .guide-content {
    min-height: var(--mobile-trex-copy-height, calc(12.2rem + 20px));
  }

  .guide-screen:has(.trex-media.guide-open-media) .guide-open-media {
    container-type: normal;
    flex: none;
    min-height: 0;
    height: auto;
    align-items: start;
    align-self: start;
  }

  /* Measure real, hidden screens without changing navigation or media state. */
  .guide-screen.is-mobile-measuring {
    display: block !important;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    visibility: hidden;
    pointer-events: none;
  }

  .guide-screen.is-mobile-measuring:has(.trex-media.guide-open-media) .guide-content {
    min-height: 0;
  }

  .is-mobile-measuring [data-trex-finish-phase] {
    display: none !important;
  }

  .is-mobile-measuring [data-trex-finish-phase="complete"] {
    display: block !important;
  }

  .guide-open-media .guide-final-photo {
    width: min(100%, 360px, 150cqh);
  }

  #setup-done .guide-open-media {
    flex-basis: 180px;
    min-height: 180px;
  }

  #trex-and-battery-connection .guide-media {
    flex: 1 0 300px;
    min-height: 300px;
    align-items: center;
  }

  #trex-and-battery-connection .guide-connection-frame {
    display: flex;
    flex-direction: column;
    height: min(100%, 480px);
  }

  #trex-and-battery-connection .guide-connection-card-header {
    flex: 0 0 auto;
    min-height: 40px;
    padding: 6px 12px;
  }

  #trex-and-battery-connection .guide-connection-visual {
    display: grid;
    grid-template-rows: minmax(0px, 1fr);
    flex: 1 1 0px;
    min-height: 96px;
    padding: 6px;
  }

  #trex-and-battery-connection .guide-connection-visual > :is(.guide-media-reference, .guide-media-video, .guide-media-poster) {
    grid-area: 1 / 1;
    min-height: 0px;
    height: 100%;
    max-height: 100%;
    aspect-ratio: auto;
    object-fit: contain;
  }

  #trex-and-battery-connection .guide-connection-card-footer {
    flex: 0 0 auto;
    padding: 8px 12px;
  }

  #trex-and-battery-connection .guide-connection-card-footer .guide-media-cues {
    margin-top: 8px;
  }

  #initialization .guide-layout {
    height: auto;
  }

  #initialization .initialization-media {
    align-self: center;
    gap: 16px;
  }

  #initialization .initialization-device {
    padding: 10px;
  }

  #initialization .initialization-device-image {
    width: min(100%, 180px);
    max-height: clamp(180px, 28svh, 240px);
  }

  #initialization .initialization-card-content {
    padding-top: 10px;
  }

  #initialization .initialization-card-title {
    margin-bottom: 6px;
    font-size: 1.125rem;
  }

  .welcome-device .hero-image {
    top: 5px;
    max-height: 100%;
    object-fit: contain;
    width: min(100%, 330px, 66.6667cqh);
  }

  .guide-shell-home {
    min-height: 44px;
    align-items: center;
  }

  .guide-screen:not(.is-measuring) .guide-lead {
    overflow-wrap: anywhere;
    font-size: 1.125rem;
    line-height: 1.45;
  }

  .guide-connection-phase {
    font-size: 1.0625rem;
  }

  .guide-connection-kicker {
    font-size: 0.875rem;
  }

  #initialization .guide-update-note, #initialization .initialization-card-description {
    font-size: 1rem;
    line-height: 1.5;
  }

  .upgrade-dialog {
    width: 100%;
    max-height: 100svh;
    height: 100svh;
    border-radius: 0px;
    border: 0px;
    margin: 0px;
  }

  .upgrade-dialog-content {
    height: 100%;
    max-height: 100svh;
    font-size: 1.0625rem;
  }

  .upgrade-dialog-title {
    overflow-wrap: anywhere;
    font-size: 1.625rem;
  }

  #upgrade-instruction-summary, .dd-version-summary {
    font-size: 1rem;
    line-height: 1.5;
  }

  .upgrade-dialog-body, #upgrade-instruction-dialog .upgrade-dialog-body, .dd-version-dialog .upgrade-dialog-body {
    height: auto;
    padding: 20px;
  }

  .upgrade-step-copy p {
    overflow-wrap: anywhere;
    font-size: 1.0625rem;
    line-height: 1.5;
  }

  .upgrade-file-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 7rem), 1fr));
    column-gap: 24px;
    row-gap: 10px;
    margin-block: 12px;
  }

  .upgrade-file-list li,
  .upgrade-file-list li + li {
    margin: 0px;
  }

  .upgrade-flow-illustration {
    container-type: inline-size;
    min-height: 120px;
    padding: 16px;
  }

  .upgrade-flow-file-pair .upgrade-flow-node {
    min-height: 36px;
    padding: 8px;
  }

  /* Keep file names intact when larger text makes the horizontal flow too narrow. */
  @container (max-width: 18rem) {
    .upgrade-flow {
      flex-direction: column;
    }

    .upgrade-flow-node,
    .upgrade-flow-file-pair {
      width: 100%;
      flex: 0 0 auto;
    }

    .upgrade-flow-arrow {
      transform: rotate(90deg);
    }
  }
}