:root {
  --canvas: #f8fafc;
  --surface: #eaf5ff;
  --surface-strong: #dbeafe;
  --ink: #0b1220;
  --muted: #334155;
  --muted-light: #aab8c8;
  --inverse: #0b1220;
  --inverse-surface: #142033;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --cyan: #06b6d4;
  --accent-ink: #ffffff;
  --font-display: "Noto Serif SC", "Songti SC", "STSong", serif;
  --font-text: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --step-small: 0.875rem;
  --step-body: clamp(1rem, 0.95rem + 0.18vw, 1.0625rem);
  --step-lead: clamp(1.35rem, 1.2rem + 0.45vw, 1.5rem);
  --step-head: clamp(2.25rem, 4vw, 3.5rem);
  --step-display: clamp(3.25rem, 4.8vw, 4.5rem);
  --margin: clamp(1rem, 2.4vw, 2.5rem);
  --gutter: clamp(0.75rem, 1.35vw, 1.5rem);
  --section-space: clamp(5rem, 9vw, 9rem);
  --radius: 3px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.76, 0, 0.24, 1);
  --ease-soft: cubic-bezier(0.33, 1, 0.68, 1);
  --t-press: 140ms;
  --t-hover: 180ms;
  --t-ui: 240ms;
  --t-reveal: 800ms;
}

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

html {
  color-scheme: light;
  scroll-behavior: smooth;
  background: var(--canvas);
}

body {
  margin: 0;
  overflow-x: clip;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: var(--step-body);
  line-height: 1.58;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

p {
  max-width: 60ch;
  margin: 0;
  text-wrap: pretty;
}

p + p {
  margin-top: 0.9em;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  text-wrap: balance;
}

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: var(--margin);
  z-index: 200;
  padding: 10px 14px;
  background: var(--inverse);
  color: var(--canvas);
  transform: translateY(-160%);
  transition: transform var(--t-ui) var(--ease-out);
}

.skip-link:focus {
  transform: none;
}

.wrap {
  width: 100%;
  max-width: 1760px;
  margin-inline: auto;
  padding-inline: var(--margin);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--canvas);
}

.site-nav {
  min-height: 68px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
}

.wordmark {
  width: max-content;
  font-family: var(--font-text);
  font-size: var(--step-body);
  font-weight: 750;
  letter-spacing: -0.03em;
}

.wordmark::after {
  content: ".";
  color: var(--accent);
}

.nav-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: clamp(16px, 2.1vw, 32px);
  color: var(--muted);
  font-size: var(--step-small);
}

.nav-links a,
.footer-links a,
.text-link {
  text-decoration: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.22em;
  transition: color var(--t-hover) ease, text-decoration-color var(--t-hover) ease;
}

.nav-links a:hover,
.footer-links a:hover,
.text-link:hover {
  color: var(--ink);
  text-decoration-color: currentColor;
}

.nav-action {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding-inline: 17px;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-ink);
  font-size: var(--step-small);
  font-weight: 650;
  transition: transform var(--t-press) var(--ease-out), background-color var(--t-hover) ease;
}

.nav-action:hover {
  background: var(--accent-strong);
}

.nav-action:active,
.button:active,
.layout-choice:active {
  transform: scale(0.97);
}

.menu-toggle {
  display: none;
  min-width: 48px;
  min-height: 42px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  font-size: var(--step-small);
  font-weight: 650;
}

.mobile-menu {
  display: none;
}

.button {
  min-height: 52px;
  width: max-content;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 21px;
  border: 0;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-ink);
  cursor: pointer;
  font-size: var(--step-body);
  font-weight: 650;
  transition: transform var(--t-press) var(--ease-out), background-color var(--t-hover) ease;
}

.button:hover {
  background: var(--accent-strong);
}

.button--light {
  background: var(--canvas);
  color: var(--ink);
}

.button--light:hover {
  background: var(--accent);
  color: var(--accent-ink);
}

.split-shell {
  display: grid;
  grid-template-columns: minmax(350px, 46%) minmax(0, 1fr);
  align-items: start;
}

.product-stage {
  position: sticky;
  top: 68px;
  height: calc(100svh - 68px);
  display: flex;
  align-items: center;
  padding: clamp(1rem, 2.5vw, 2.5rem);
  overflow: hidden;
  background: var(--inverse);
  color: var(--canvas);
}

.stage-inner {
  width: 100%;
}

.stage-view {
  display: none;
}

.stage-view.is-active {
  display: block;
  animation: stage-in 500ms var(--ease-out);
}

@keyframes stage-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.stage-view > img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background: #050709;
}

.screen-stage {
  position: relative;
  aspect-ratio: 16 / 9;
  display: grid;
  gap: 3px;
  padding: 3px;
  overflow: hidden;
  background: var(--cyan);
  animation: stage-drift 16s var(--ease-in-out) infinite alternate;
}

@keyframes stage-drift {
  from { transform: scale(1); }
  to { transform: scale(1.015); }
}

.feed {
  min-width: 0;
  min-height: 0;
  position: relative;
  overflow: hidden;
  background: var(--inverse-surface);
  opacity: 1;
  transform: scale(1);
  transition: opacity var(--t-ui) ease, transform var(--t-ui) var(--ease-out);
}

.feed::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: rgba(5, 7, 9, 0.34);
}

.feed img {
  position: absolute;
  width: 200%;
  height: 200%;
  max-width: none;
  object-fit: cover;
  object-position: left top;
}

.feed span {
  position: absolute;
  left: 12px;
  top: 10px;
  z-index: 2;
  padding: 4px 8px;
  border-radius: 2px;
  background: rgba(7, 9, 13, 0.74);
  color: #fff;
  font-family: var(--font-text);
  font-size: var(--step-small);
  font-weight: 650;
  line-height: 1.1;
}

.screen-stage[data-count="1"] {
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
  grid-template-areas: "windows";
}

.screen-stage[data-count="2"] {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr;
  grid-template-areas: "windows android";
}

.screen-stage[data-count="3"],
.screen-stage[data-count="4"] {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
}

.screen-stage[data-count="3"] {
  grid-template-areas: "windows android" "dlna dlna";
}

.screen-stage[data-count="4"] {
  grid-template-areas: "windows android" "dlna apple";
}

.screen-stage[data-count="1"] .feed:not([data-feed="windows"]),
.screen-stage[data-count="2"] .feed:not([data-feed="windows"]):not([data-feed="android"]),
.screen-stage[data-count="3"] .feed[data-feed="apple"] {
  opacity: 0;
  transform: scale(0.96);
  pointer-events: none;
}

.feed[data-feed="windows"] { grid-area: windows; }
.feed[data-feed="android"] { grid-area: android; }
.feed[data-feed="dlna"] { grid-area: dlna; }
.feed[data-feed="apple"] { grid-area: apple; }
.feed[data-feed="windows"] { view-transition-name: feed-windows; }
.feed[data-feed="android"] { view-transition-name: feed-android; }
.feed[data-feed="dlna"] { view-transition-name: feed-dlna; }
.feed[data-feed="apple"] { view-transition-name: feed-apple; }
.feed[data-feed="windows"] img { transform: translate(0, 0); }
.feed[data-feed="android"] img { transform: translate(0, -50%); }
.feed[data-feed="dlna"] img { transform: translate(-50%, -50%); }
.feed[data-feed="apple"] img { transform: translate(-50%, 0); }

.screen-stage[data-count="1"] .feed[data-feed="windows"] img {
  width: 100%;
  height: 100%;
  transform: none;
}

.screen-stage[data-count="3"] .feed[data-feed="dlna"] img {
  transform: translate(-25%, -50%);
}

::view-transition-group(feed-windows),
::view-transition-group(feed-android),
::view-transition-group(feed-dlna),
::view-transition-group(feed-apple) {
  animation-duration: 320ms;
  animation-timing-function: var(--ease-in-out);
}

.story-column {
  min-width: 0;
  padding-inline: clamp(2.5rem, 6vw, 7rem);
}

.story-intro {
  min-height: calc(100svh - 68px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding-block: 4rem;
}

.story-intro h1 {
  max-width: none;
  font-size: var(--step-display);
  line-height: 0.96;
  letter-spacing: -0.045em;
}

.story-intro .lead {
  max-width: 30ch;
  margin-top: 2rem;
  color: var(--ink);
  font-size: var(--step-lead);
  line-height: 1.45;
}

.story-intro .button {
  margin-top: 2rem;
}

.intro-meta {
  margin-top: 1.4rem;
  color: var(--muted);
  font-size: var(--step-small);
}

.story-section {
  min-height: 78svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-block: var(--section-space);
  scroll-margin-top: 78px;
}

.story-section h2 {
  max-width: none;
  font-size: var(--step-head);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.story-section .lead {
  max-width: 40ch;
  margin-top: 1.5rem;
  color: var(--ink);
  font-size: var(--step-lead);
  line-height: 1.45;
}

.layout-panel {
  margin-top: 2.6rem;
}

.layout-readout {
  min-height: 4.5em;
}

.layout-readout strong {
  position: relative;
  display: block;
  margin-bottom: 0.4rem;
  padding-left: 0.8em;
  font-family: var(--font-text);
  font-size: var(--step-lead);
  line-height: 1.1;
}

.layout-readout strong::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.38em;
  width: 0.34em;
  height: 0.34em;
  border-radius: 50%;
  background: var(--cyan);
}

.layout-readout span {
  color: var(--muted);
  font-size: var(--step-small);
}

.layout-choices {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 1.5rem;
}

.layout-choice {
  min-height: 48px;
  border: 0;
  border-radius: var(--radius);
  background: var(--surface-strong);
  color: var(--ink);
  cursor: pointer;
  font-size: var(--step-small);
  font-weight: 650;
  transition: transform var(--t-press) var(--ease-out), background-color var(--t-hover) ease, color var(--t-hover) ease;
}

.layout-choice:hover {
  background: #c7cbd0;
}

.layout-choice[aria-pressed="true"] {
  background: var(--accent);
  color: var(--accent-ink);
}

.detail-list,
.step-list {
  display: grid;
  gap: 0;
  margin: 2.4rem 0 0;
  padding: 0;
  list-style: none;
}

.detail-list li {
  display: grid;
  grid-template-columns: minmax(120px, 0.7fr) minmax(0, 1.3fr);
  gap: 1.4rem;
  padding: 1.25rem 0;
  background: var(--canvas);
}

.detail-list li:nth-child(even) {
  background: var(--surface);
}

.detail-list strong,
.mode-row h3,
.step-list h3 {
  font-family: var(--font-text);
  font-size: var(--step-body);
  font-weight: 650;
}

.detail-list span,
.mode-row p,
.step-list p {
  color: var(--muted);
  font-size: var(--step-body);
}

.mode-list {
  display: grid;
  margin-top: 2.6rem;
}

.mode-row {
  display: grid;
  grid-template-columns: minmax(120px, 0.72fr) minmax(0, 1.28fr);
  gap: 1.4rem;
  padding: 1.35rem 0;
}

.mode-row:nth-child(even) {
  background: var(--surface);
}

.mode-row h3,
.mode-row p {
  margin: 0;
}

.step-list {
  counter-reset: step;
}

.step-list li {
  display: grid;
  grid-template-columns: minmax(120px, 0.72fr) minmax(0, 1.28fr);
  gap: 1.4rem;
  padding: 1.35rem 0;
}

.step-list li:nth-child(even) {
  background: var(--surface);
}

.download {
  padding-block: var(--section-space);
  background: var(--surface);
}

.download-head {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(280px, 4fr);
  gap: var(--gutter);
  align-items: end;
  margin-bottom: clamp(2.5rem, 5vw, 4.5rem);
}

.section-heading {
  font-size: var(--step-head);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.section-lead {
  max-width: 41ch;
  color: var(--ink);
  font-size: var(--step-lead);
  line-height: 1.45;
}

.download-list {
  display: grid;
}

.download-row {
  display: grid;
  grid-template-columns: minmax(180px, 2.1fr) minmax(100px, 0.7fr) minmax(160px, 1fr) minmax(210px, 1.3fr);
  gap: var(--gutter);
  align-items: center;
  min-height: 116px;
  padding: 1.2rem clamp(0.75rem, 1.4vw, 1.25rem);
  background: var(--surface);
}

.download-row:nth-child(odd) {
  background: var(--canvas);
}

.platform {
  display: grid;
  gap: 0.25rem;
}

.platform strong {
  font-family: var(--font-text);
  font-size: var(--step-lead);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.platform span,
.download-meta,
.download-format {
  color: var(--muted);
  font-size: var(--step-small);
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.row-action {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 15px;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-ink);
  font-size: var(--step-small);
  font-weight: 650;
  transition: transform var(--t-press) var(--ease-out), background-color var(--t-hover) ease;
}

.row-action:hover {
  background: var(--accent-strong);
}

.row-action:active {
  transform: scale(0.97);
}

.row-action--disabled {
  background: var(--surface-strong);
  color: var(--muted);
  cursor: default;
}

.download-note {
  max-width: 72ch;
  margin-top: 1.4rem;
  color: var(--muted);
  font-size: var(--step-small);
}

.faq {
  padding-block: var(--section-space);
  background: var(--canvas);
}

.faq-layout {
  display: grid;
  grid-template-columns: minmax(180px, 3fr) minmax(0, 9fr);
  gap: clamp(2rem, 6vw, 7rem);
  align-items: start;
}

.faq-copy {
  columns: 2;
  column-gap: clamp(2rem, 4vw, 4rem);
}

.faq-copy p {
  break-inside: avoid;
  margin: 0 0 1.3rem;
  color: var(--muted);
}

.faq-copy strong {
  color: var(--ink);
  font-weight: 650;
}

.closing {
  min-height: 58svh;
  display: grid;
  grid-template-rows: 1fr auto;
  padding-top: clamp(5rem, 9vw, 8rem);
  background: var(--surface);
}

.closing-main {
  width: min(100%, 58rem);
  margin-inline: auto;
  padding-inline: var(--margin);
}

.closing h2 {
  max-width: 12ch;
  font-size: var(--step-head);
  line-height: 1.04;
  letter-spacing: -0.04em;
}

.closing p {
  max-width: 42ch;
  margin-top: 1.4rem;
  color: var(--ink);
  font-size: var(--step-body);
}

.closing .button {
  margin-top: 1.6rem;
}

.site-footer {
  margin-top: clamp(4rem, 8vw, 7rem);
  padding-block: 1.2rem;
  color: var(--muted);
  font-size: var(--step-small);
}

.closing .site-footer {
  background: var(--surface);
}

.footer-meta {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1.2rem;
}

.footer-meta > :first-child {
  justify-self: start;
}

.footer-meta > :last-child {
  justify-self: end;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem 1.4rem;
}

.site-counter {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 28px;
  padding: 3px 9px;
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  white-space: nowrap;
}

.site-counter[hidden] {
  display: none;
}

.site-counter i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #198754;
}

.site-counter b {
  color: var(--ink);
  font-weight: 650;
}

/* Guide */
.guide-hero {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(280px, 4fr);
  gap: var(--gutter);
  align-items: end;
  padding-block: clamp(4rem, 8vw, 7rem) clamp(2.5rem, 5vw, 4.5rem);
}

.guide-hero h1 {
  max-width: 11ch;
  font-size: var(--step-display);
  line-height: 1;
  letter-spacing: -0.045em;
}

.guide-hero p {
  max-width: 36ch;
  color: var(--ink);
  font-size: var(--step-lead);
  line-height: 1.45;
}

.guide-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px clamp(16px, 2vw, 28px);
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: var(--step-small);
}

.guide-jump a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.guide-layout {
  display: grid;
  grid-template-columns: minmax(170px, 2.2fr) minmax(0, 8fr);
  gap: clamp(3rem, 8vw, 9rem);
  align-items: start;
  padding-bottom: var(--section-space);
}

.guide-rail {
  position: sticky;
  top: 94px;
  display: grid;
  gap: 13px;
  color: var(--muted);
  font-size: var(--step-small);
}

.guide-rail a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.guide-content {
  min-width: 0;
}

.guide-section {
  padding-block: clamp(3.5rem, 7vw, 6.5rem);
  scroll-margin-top: 92px;
}

.guide-section:first-child {
  padding-top: 0;
}

.guide-section--field {
  margin-inline: calc(clamp(0.9rem, 2vw, 2rem) * -1);
  padding-inline: clamp(0.9rem, 2vw, 2rem);
  background: var(--surface);
}

.guide-section h2 {
  max-width: 11ch;
  font-size: var(--step-head);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.guide-section > p {
  max-width: 52ch;
  margin-top: 1.25rem;
  color: var(--ink);
  font-size: var(--step-lead);
  line-height: 1.45;
}

.guide-steps {
  display: grid;
  margin-top: clamp(2rem, 4vw, 3.5rem);
}

.guide-step {
  display: grid;
  grid-template-columns: minmax(150px, 3fr) minmax(0, 7fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  padding: 1.6rem 0;
}

.guide-step:nth-child(even) {
  background: var(--surface);
}

.guide-section--field .guide-step:nth-child(even) {
  background: var(--canvas);
}

.guide-step h3 {
  max-width: 11ch;
  font-family: var(--font-text);
  font-size: var(--step-lead);
  font-weight: 650;
  line-height: 1.1;
}

.guide-step p {
  max-width: 55ch;
  color: var(--ink);
  font-size: var(--step-body);
}

.guide-step code {
  padding: 0.12em 0.38em;
  border-radius: 2px;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 0.94em;
}

.guide-step a {
  color: var(--accent-strong);
  font-weight: 650;
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.view-compare-block {
  margin-top: clamp(2rem, 4vw, 3.5rem);
  padding: clamp(1.25rem, 3vw, 2.25rem);
  background: var(--surface);
}

.view-compare-block h3 {
  font-size: var(--step-lead);
}

.view-compare-block > p {
  max-width: 54ch;
  margin-top: 0.9rem;
  color: var(--ink);
}

.view-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1rem, 2vw, 1.5rem);
  margin-top: 1.5rem;
}

.view-option {
  min-width: 0;
  margin: 0;
}

.view-television {
  position: relative;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--inverse);
}

.view-phone {
  height: 100%;
  aspect-ratio: 9 / 16;
  overflow: hidden;
  background: var(--inverse-surface);
}

.view-phone img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.view-television--fill .view-phone {
  width: 100%;
  height: 100%;
  aspect-ratio: auto;
}

.view-television--fill .view-phone img {
  transform: scale(1.16);
}

.view-option figcaption {
  display: grid;
  gap: 0.35rem;
  padding-top: 0.8rem;
}

.view-option strong {
  font-family: var(--font-text);
  font-size: var(--step-body);
  font-weight: 700;
}

.view-option span {
  color: var(--muted);
  font-size: var(--step-small);
  line-height: 1.5;
}

.guide-shot {
  margin-top: clamp(2rem, 4vw, 3.5rem);
  background: var(--surface);
}

.guide-shot img {
  width: 100%;
  height: auto;
}

.guide-figure-caption {
  margin-top: 0.8rem;
  color: var(--muted);
  font-size: var(--step-small);
}

.trouble-list {
  display: grid;
  margin-top: 2rem;
}

.trouble-row {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 6fr);
  gap: clamp(2rem, 6vw, 6rem);
  padding-block: 1.8rem;
}

.trouble-row:nth-child(odd) {
  background: var(--surface);
}

.trouble-row h3 {
  font-family: var(--font-text);
  font-size: var(--step-lead);
  font-weight: 650;
  line-height: 1.1;
}

.trouble-row p {
  max-width: 52ch;
  color: var(--ink);
  font-size: var(--step-body);
}

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 700ms var(--ease-out), transform 900ms var(--ease-out);
}

html.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

@media (max-width: 1000px) {
  .split-shell {
    grid-template-columns: 1fr;
  }

  .product-stage {
    position: relative;
    top: auto;
    height: auto;
    padding: 1.25rem var(--margin) 1.5rem;
  }

  .stage-inner {
    max-width: 780px;
    margin-inline: auto;
  }

  .story-column {
    padding-inline: var(--margin);
  }

  .story-intro {
    min-height: auto;
    padding-block: 3.5rem 4rem;
  }

  .story-section {
    min-height: auto;
    padding-block: 4.5rem;
  }

  .guide-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .guide-rail {
    display: none;
  }

  .guide-hero {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 820px) {
  .site-nav {
    min-height: 62px;
    grid-template-columns: 1fr auto auto;
    gap: 10px;
  }

  .nav-links {
    display: none;
  }

  .nav-action {
    min-height: 40px;
    padding-inline: 13px;
  }

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  html.js .mobile-menu {
    position: fixed;
    inset: 62px 0 0;
    z-index: 90;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 3rem var(--margin) 2rem;
    background: var(--inverse);
    color: var(--canvas);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--t-ui) var(--ease-out), transform var(--t-ui) var(--ease-out), visibility var(--t-ui);
  }

  html.js .mobile-menu.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .mobile-menu-links {
    display: grid;
    gap: 1.15rem;
    font-family: var(--font-display);
    font-size: var(--step-head);
    font-weight: 700;
    line-height: 1.02;
    letter-spacing: -0.04em;
  }

  .mobile-menu-note {
    max-width: 34ch;
    color: var(--muted-light);
    font-size: var(--step-small);
  }

  .product-stage {
    padding-inline: 1rem;
  }

  .stage-caption {
    margin-top: 0.8rem;
  }

  .story-intro h1 {
    max-width: 9ch;
  }

  .story-intro .lead {
    max-width: 34ch;
  }

  .detail-list li,
  .mode-row,
  .step-list li {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }

  .download-head,
  .faq-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .download-row {
    grid-template-columns: 1fr;
    gap: 0.55rem;
    min-height: 0;
    padding-block: 1.4rem;
  }

  .download-actions {
    justify-content: flex-start;
    margin-top: 0.5rem;
  }

  .faq-copy {
    columns: 1;
  }

  .footer-meta {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

  .footer-meta > :first-child,
  .footer-meta > :last-child {
    justify-self: start;
  }

  .footer-links {
    justify-content: flex-start;
  }

  .guide-hero {
    padding-block: 3.5rem 3rem;
  }

  .guide-hero h1 {
    font-size: var(--step-head);
    line-height: 1.02;
  }

  .guide-step,
  .trouble-row {
    grid-template-columns: 1fr;
    gap: 0.7rem;
  }

  .view-compare {
    grid-template-columns: 1fr;
  }

  .guide-section--field {
    margin-inline: calc(var(--margin) * -1);
    padding-inline: var(--margin);
  }
}

@media (max-width: 430px) {
  .wordmark {
    font-size: var(--step-small);
  }

  .product-stage {
    padding-inline: 0.75rem;
  }

  .screen-stage {
    aspect-ratio: 4 / 3;
  }

  .stage-caption {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.2rem;
  }

  .story-intro {
    padding-block: 2.5rem 3.5rem;
  }

  .story-intro .button,
  .closing .button {
    width: 100%;
  }

  .layout-choices {
    gap: 6px;
  }

  .layout-choice {
    min-height: 44px;
  }

  .download-actions {
    width: 100%;
  }

  .row-action {
    flex: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  html.js [data-reveal] {
    opacity: 1;
    transform: none;
  }
}