:root {
  --ink: #000;
  --ink-soft: #0b0b0c;
  --ink-card: #171719;
  --green: #d54b57;
  --green-bright: #ef646e;
  --mint: #f2d1d4;
  --amber: #e45a65;
  --paper: #050505;
  --paper-green: #121214;
  --sage: #aaa6a8;
  --line: rgba(255, 255, 255, 0.1);
  --white-line: rgba(255, 255, 255, 0.12);
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.58);
  --radius: 24px;
  --container: 1180px;
  --display: "Arial Rounded MT Bold", "Microsoft YaHei UI", "PingFang SC", sans-serif;
  --body: "Microsoft YaHei UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
}

body {
  margin: 0;
  color: #f4f2f3;
  background: var(--paper);
  font-family: var(--body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body.nav-open,
body.modal-open {
  overflow: hidden;
}

img,
svg {
  display: block;
}

img {
  max-width: 100%;
  height: auto;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

[hidden] {
  display: none !important;
}

.container {
  width: min(calc(100% - 40px), var(--container));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 999;
  padding: 10px 16px;
  border-radius: 10px;
  color: var(--ink);
  background: var(--green);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

/* 顶部导航沿用原站的三段式结构。 */
.site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 100;
  color: #fff;
}

.header-inner {
  min-height: 92px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 28px;
  border-bottom: 1px solid var(--white-line);
}

.brand,
.footer-brand {
  width: max-content;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand img,
.footer-brand img,
.floating-download img {
  flex: 0 0 auto;
  border-radius: 13px;
  object-fit: cover;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.brand span,
.footer-brand span,
.floating-download span {
  display: grid;
  line-height: 1.2;
}

.brand strong,
.footer-brand strong,
.floating-download strong {
  font-family: var(--display);
  letter-spacing: 0.02em;
}

.brand small {
  margin-top: 3px;
  color: var(--sage);
  font: 0.62rem/1.2 Arial, sans-serif;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 34px;
  color: rgba(255, 255, 255, 0.74);
  font-size: 0.9rem;
}

.site-nav a {
  position: relative;
  transition: color 180ms ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -8px;
  left: 0;
  height: 1px;
  background: var(--green);
  transform: scaleX(0);
  transition: transform 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: #fff;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.header-download {
  justify-self: end;
}

.nav-toggle {
  display: none;
}

.button {
  min-height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 14px;
  background: transparent;
  font-weight: 700;
  cursor: pointer;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button svg,
.text-link svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.button-small {
  min-height: 44px;
  padding-inline: 18px;
  border-radius: 12px;
  font-size: 0.86rem;
}

.button-primary,
.header-download {
  color: var(--ink);
  background: var(--green);
  box-shadow: 0 12px 34px rgba(213, 75, 87, 0.18);
}

.button-primary:hover,
.header-download:hover {
  background: var(--green-bright);
  box-shadow: 0 16px 36px rgba(213, 75, 87, 0.28);
}

.button-ghost {
  border-color: var(--white-line);
  color: #fff;
  background: rgba(255, 255, 255, 0.04);
}

.button-ghost:hover {
  border-color: rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.08);
}

/* 首屏通过电视画框、信号轨道和遥控器焦点体现 TVBox 的客厅属性。 */
.hero {
  position: relative;
  min-height: 820px;
  overflow: hidden;
  color: #fff;
  background:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    var(--ink);
  background-size: 64px 64px;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 160px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.18));
  pointer-events: none;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(20px);
  pointer-events: none;
}

.hero-glow-one {
  width: 580px;
  height: 580px;
  top: 72px;
  right: -90px;
  background: radial-gradient(circle, rgba(213, 75, 87, 0.24), rgba(213, 75, 87, 0) 68%);
}

.hero-glow-two {
  width: 420px;
  height: 420px;
  bottom: -220px;
  left: 10%;
  background: radial-gradient(circle, rgba(125, 122, 123, 0.16), rgba(125, 122, 123, 0) 70%);
}

.hero-grid {
  min-height: 820px;
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  align-items: center;
  gap: 54px;
  padding-top: 118px;
}

.hero-copy {
  position: relative;
  z-index: 2;
  padding-bottom: 44px;
}

.availability {
  width: max-content;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 30px;
  padding: 8px 12px;
  border: 1px solid rgba(213, 75, 87, 0.28);
  border-radius: 999px;
  color: var(--mint);
  background: rgba(213, 75, 87, 0.08);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
}

.availability-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 5px rgba(213, 75, 87, 0.12);
  animation: breathe 2.2s ease-in-out infinite;
}

.hero-kicker,
.section-kicker,
.section-heading p,
.download-copy > p {
  margin: 0 0 12px;
  color: var(--amber);
  font: 700 0.72rem/1.2 Arial, sans-serif;
  letter-spacing: 0.18em;
}

.hero h1 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(3.7rem, 6.4vw, 6.7rem);
  line-height: 0.94;
  letter-spacing: -0.07em;
}

.hero h1 em {
  display: inline-block;
  color: var(--green);
  font-size: 0.62em;
  font-style: normal;
  letter-spacing: -0.04em;
}

.hero-lead {
  max-width: 580px;
  margin: 28px 0 34px;
  color: rgba(255, 255, 255, 0.66);
  font-size: 1.02rem;
  line-height: 1.9;
}

.hero-lead strong {
  color: #fff;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin: 28px 0 0;
  padding: 0;
  color: rgba(255, 255, 255, 0.76);
  list-style: none;
  font-size: 0.86rem;
}

.hero-points li {
  display: flex;
  align-items: center;
  gap: 7px;
}

.hero-points svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: var(--green);
  stroke-width: 2;
}

.hero-stage {
  position: relative;
  z-index: 1;
  min-height: 660px;
  display: grid;
  place-items: center;
}

.hero-stage::before {
  content: "";
  position: absolute;
  width: 500px;
  height: 500px;
  border: 1px solid rgba(213, 75, 87, 0.14);
  border-radius: 50%;
}

.hero-stage::after {
  content: "";
  position: absolute;
  width: 370px;
  height: 370px;
  border: 1px dashed rgba(255, 255, 255, 0.12);
  border-radius: 50%;
  animation: slow-spin 36s linear infinite;
}

.tv-frame {
  position: relative;
  z-index: 4;
  width: 510px;
  height: 345px;
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 28px;
  background: #081218;
  box-shadow: 0 44px 90px rgba(0, 0, 0, 0.46), inset 0 0 0 2px rgba(255, 255, 255, 0.05);
  transform: rotate(2deg);
}

.tv-screen {
  position: relative;
  height: 100%;
  overflow: hidden;
  padding: 18px;
  border-radius: 19px;
  color: #fff;
  background:
    radial-gradient(circle at 84% 4%, rgba(213, 75, 87, 0.2), transparent 27%),
    #181819;
}

.tv-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 10px;
}

.tv-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tv-brand img {
  border-radius: 11px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.tv-brand > span {
  display: grid;
  line-height: 1.25;
}

.tv-brand strong {
  font: 700 0.82rem/1.2 var(--display);
}

.tv-brand small,
.tv-clock {
  color: var(--sage);
  font-size: 0.5rem;
}

.tv-clock {
  display: flex;
  align-items: center;
  gap: 6px;
}

.tv-clock strong {
  margin-left: 6px;
  color: #fff;
  font: 700 0.62rem/1 Arial, sans-serif;
}

.network-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(213, 75, 87, 0.12);
}

.tv-featured {
  position: relative;
  height: 128px;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 17px 19px;
  border-radius: 16px;
  background:
    radial-gradient(circle at 82% 18%, rgba(213, 75, 87, 0.72), transparent 24%),
    radial-gradient(circle at 74% 72%, rgba(135, 132, 133, 0.32), transparent 31%),
    linear-gradient(135deg, #171719, #343335 62%, #71313a);
}

.tv-featured::after {
  content: "";
  position: absolute;
  width: 150px;
  height: 150px;
  right: -35px;
  bottom: -72px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 50%;
}

.tv-featured > div:first-child {
  position: relative;
  z-index: 2;
  display: grid;
}

.tv-label {
  margin-bottom: 7px;
  color: var(--mint);
  font: 700 0.45rem/1 Arial, sans-serif;
  letter-spacing: 0.14em;
}

.tv-featured strong {
  font-family: var(--display);
  font-size: 0.92rem;
  line-height: 1.28;
}

.tv-featured button {
  width: max-content;
  display: flex;
  align-items: center;
  gap: 5px;
  margin-top: 10px;
  padding: 6px 10px;
  border: 0;
  border-radius: 7px;
  color: var(--ink);
  background: #fff;
  font-size: 0.48rem;
  font-weight: 700;
}

.tv-featured button svg {
  width: 12px;
  height: 12px;
  fill: currentColor;
}

.signal-waves {
  position: absolute;
  right: 34px;
  bottom: 22px;
  width: 100px;
  height: 86px;
}

.signal-waves i {
  position: absolute;
  right: 0;
  bottom: 0;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 50% 0 0;
}

.signal-waves i:nth-child(1) {
  width: 42px;
  height: 42px;
}

.signal-waves i:nth-child(2) {
  width: 68px;
  height: 68px;
}

.signal-waves i:nth-child(3) {
  width: 94px;
  height: 94px;
}

.tv-shortcuts {
  display: flex;
  gap: 7px;
  margin: 10px 0;
}

.tv-shortcuts span {
  padding: 5px 11px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  color: var(--sage);
  background: rgba(255, 255, 255, 0.035);
  font-size: 0.48rem;
}

.tv-shortcuts .active {
  border-color: var(--green);
  color: var(--ink);
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(213, 75, 87, 0.14);
}

.source-panel {
  display: grid;
  grid-template-columns: 34px 1fr auto;
  align-items: center;
  gap: 9px;
  padding: 8px 10px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.045);
}

.source-icon {
  width: 34px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: var(--green);
  background: rgba(213, 75, 87, 0.12);
  font: 700 0.55rem/1 Consolas, monospace;
}

.source-panel > span {
  display: grid;
  line-height: 1.25;
}

.source-panel strong {
  font-size: 0.58rem;
}

.source-panel small {
  margin-top: 2px;
  color: var(--sage);
  font-size: 0.43rem;
}

.source-panel button {
  padding: 6px 9px;
  border: 0;
  border-radius: 7px;
  color: #fff;
  background: #3a393b;
  font-size: 0.46rem;
}

.tv-stand {
  position: absolute;
  right: 0;
  bottom: -35px;
  left: 0;
  display: grid;
  place-items: center;
}

.tv-stand::before {
  content: "";
  width: 74px;
  height: 29px;
  background: linear-gradient(90deg, #101a1f, #22333b, #101a1f);
  clip-path: polygon(34% 0, 66% 0, 82% 100%, 18% 100%);
}

.tv-stand span {
  position: absolute;
  bottom: -4px;
  width: 150px;
  height: 8px;
  border-radius: 50%;
  background: #101a1f;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.35);
}

.signal-orbit {
  position: absolute;
  z-index: 2;
  border-radius: 50%;
  pointer-events: none;
}

.signal-orbit span {
  position: absolute;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--mint);
  background: rgba(18, 18, 20, 0.94);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.2);
  font: 700 0.58rem/1 Arial, sans-serif;
}

.signal-orbit-one {
  width: 590px;
  height: 500px;
}

.signal-orbit-one span {
  width: 46px;
  height: 38px;
  border-radius: 9px;
}

.signal-orbit-one span::before {
  content: "";
  position: absolute;
  top: 7px;
  right: 7px;
  left: 7px;
  height: 1px;
  background: rgba(255, 255, 255, 0.18);
}

.signal-orbit-one span:nth-child(1) {
  top: 54px;
  left: 35px;
  transform: rotate(-9deg);
}

.signal-orbit-one span:nth-child(2) {
  top: 30px;
  right: 58px;
  color: var(--amber);
  transform: rotate(8deg);
}

.signal-orbit-one span:nth-child(3) {
  right: 18px;
  bottom: 100px;
  transform: rotate(12deg);
}

.signal-orbit-one span:nth-child(4) {
  bottom: 34px;
  left: 82px;
  transform: rotate(-12deg);
}

.signal-orbit-two {
  width: 460px;
  height: 390px;
}

.signal-orbit-two span {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  color: var(--green);
}

.signal-orbit-two span:nth-child(1) {
  top: 110px;
  left: -12px;
}

.signal-orbit-two span:nth-child(2) {
  top: 20px;
  right: 44px;
}

.signal-orbit-two span:nth-child(3) {
  right: -8px;
  bottom: 98px;
}

.version-card,
.remote-card {
  position: absolute;
  z-index: 5;
  display: flex;
  align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.13);
  color: #fff;
  background: rgba(20, 20, 22, 0.94);
  box-shadow: 0 22px 48px rgba(0, 0, 0, 0.27);
  backdrop-filter: blur(16px);
}

.version-card {
  right: -6px;
  bottom: 88px;
  gap: 11px;
  padding: 12px 15px;
  border-radius: 15px;
}

.android-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: var(--ink);
  background: var(--green);
}

.android-mark svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.6;
}

.version-card > span:last-child,
.remote-card {
  display: grid;
  line-height: 1.2;
}

.version-card small,
.remote-card small {
  color: var(--sage);
  font-size: 0.56rem;
}

.version-card strong {
  margin-top: 3px;
  font: 700 0.82rem/1.1 Arial, sans-serif;
}

.remote-card {
  top: 112px;
  left: -8px;
  padding: 13px 16px;
  border-radius: 14px;
  transform: rotate(-5deg);
}

.remote-card strong {
  margin-top: 5px;
  font: 700 0.8rem/1 Arial, sans-serif;
}

.facts {
  position: relative;
  z-index: 10;
  margin-top: -1px;
  color: #fff;
  background: var(--ink-soft);
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-left: 1px solid var(--white-line);
}

.fact-grid > div {
  min-height: 106px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 18px 30px;
  border-right: 1px solid var(--white-line);
}

.fact-grid span {
  margin-bottom: 5px;
  color: var(--sage);
  font-size: 0.68rem;
}

.fact-grid strong {
  font-size: 0.9rem;
}

.seo-intro {
  padding: 54px 0;
  border-bottom: 1px solid var(--line);
  background: var(--ink-soft);
}

.seo-intro-inner {
  display: grid;
  grid-template-columns: 0.35fr 1.65fr;
  gap: 70px;
}

.seo-intro-label {
  padding-top: 8px;
  color: #817d7f;
  font: 700 0.66rem/1.3 Arial, sans-serif;
  letter-spacing: 0.16em;
}

.seo-intro h2 {
  margin: 0 0 12px;
  font-family: var(--display);
  font-size: 1.45rem;
}

.seo-intro p {
  max-width: 850px;
  margin: 0;
  color: var(--sage);
  font-size: 0.9rem;
}

.seo-intro p strong {
  color: #fff;
}

.keyword-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.keyword-links a {
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: #c0bdbf;
  background: var(--paper);
  font-size: 0.68rem;
}

.keyword-links a:hover {
  border-color: rgba(213, 75, 87, 0.58);
  color: var(--green-bright);
}

.section {
  padding: 116px 0;
}

.section-heading {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: end;
  gap: 80px;
  margin-bottom: 50px;
}

.section-heading h2,
.install-copy h2,
.faq-heading h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.5rem, 4vw, 4.25rem);
  line-height: 1.08;
  letter-spacing: -0.055em;
}

.section-heading > span {
  max-width: 430px;
  justify-self: end;
  color: var(--sage);
  font-size: 0.88rem;
}

.features {
  background: var(--paper);
}

.feature-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  grid-template-rows: repeat(2, 1fr);
  gap: 18px;
}

.feature-card {
  position: relative;
  min-height: 250px;
  overflow: hidden;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #101011;
}

.feature-card-large {
  min-height: 518px;
  grid-row: 1 / 3;
  color: #fff;
  background:
    radial-gradient(circle at 84% 18%, rgba(213, 75, 87, 0.2), transparent 28%),
    var(--ink-soft);
}

.feature-icon {
  width: 50px;
  height: 50px;
  display: grid;
  place-items: center;
  margin-bottom: 45px;
  border-radius: 14px;
  color: var(--ink);
  background: var(--green);
}

.feature-card:not(.feature-card-large) .feature-icon {
  margin-bottom: 28px;
  background: var(--paper-green);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature-index {
  position: absolute;
  top: 34px;
  right: 34px;
  color: #777476;
  font: 700 0.65rem/1 Arial, sans-serif;
  letter-spacing: 0.1em;
}

.feature-card-large .feature-index {
  color: var(--green);
}

.feature-card h3 {
  margin: 0 0 9px;
  font-family: var(--display);
  font-size: 1.35rem;
}

.feature-card p {
  max-width: 430px;
  margin: 0;
  color: var(--sage);
  font-size: 0.85rem;
}

.feature-card-large p {
  max-width: 440px;
  color: var(--sage);
}

.catalog-visual {
  position: absolute;
  right: 34px;
  bottom: 30px;
  left: 34px;
  display: grid;
  gap: 8px;
  padding: 13px;
  border: 1px solid var(--white-line);
  border-radius: 19px;
  background: rgba(255, 255, 255, 0.045);
}

.catalog-visual > div {
  display: grid;
  grid-template-columns: 38px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 9px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
}

.catalog-icon {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: #fff;
  font: 700 0.7rem/1 Arial, sans-serif;
}

.catalog-one {
  background: linear-gradient(145deg, #e15a65, #8c2833);
}

.catalog-two {
  background: linear-gradient(145deg, #878485, #454446);
}

.catalog-three {
  background: linear-gradient(145deg, #58575a, #252527);
}

.catalog-visual span {
  display: grid;
  line-height: 1.3;
}

.catalog-visual b {
  font-size: 0.68rem;
}

.catalog-visual small {
  color: var(--sage);
  font-size: 0.52rem;
}

.catalog-visual em {
  padding: 6px 9px;
  border-radius: 7px;
  color: var(--green);
  background: rgba(213, 75, 87, 0.11);
  font-size: 0.55rem;
  font-style: normal;
}

.install {
  color: #fff;
  background:
    linear-gradient(rgba(255, 255, 255, 0.024) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.024) 1px, transparent 1px),
    var(--ink);
  background-size: 64px 64px;
}

.install-grid {
  display: grid;
  grid-template-columns: 0.82fr 1.18fr;
  gap: 110px;
}

.install-copy > p:not(.section-kicker) {
  margin: 26px 0 30px;
  color: var(--sage);
  font-size: 0.9rem;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--green);
  font-size: 0.84rem;
  font-weight: 700;
}

.text-link svg {
  transition: transform 180ms ease;
}

.text-link:hover svg {
  transform: translateX(4px);
}

.install-preview {
  display: grid;
  grid-template-columns: 54px 1fr;
  align-items: center;
  gap: 0 20px;
  padding: 10px 28px;
  border: 1px solid var(--white-line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.035);
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.install-preview:hover {
  border-color: rgba(213, 75, 87, 0.5);
  background: rgba(255, 255, 255, 0.055);
  transform: translateY(-3px);
}

.install-preview > span {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(213, 75, 87, 0.28);
  border-radius: 50%;
  color: var(--green);
  font: 700 0.64rem/1 Arial, sans-serif;
}

.install-preview > div {
  display: grid;
  padding: 19px 0;
  border-bottom: 1px solid var(--white-line);
}

.install-preview > div:last-child {
  border-bottom: 0;
}

.install-preview small {
  color: var(--sage);
  font-size: 0.66rem;
}

.install-preview strong {
  margin-top: 3px;
  font-family: var(--display);
}

.download-section {
  padding-bottom: 70px;
  background: var(--paper);
}

.download-panel {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  border-radius: 34px;
  color: #fff;
  background:
    radial-gradient(circle at 10% 88%, rgba(213, 75, 87, 0.18), transparent 25%),
    linear-gradient(125deg, #0b0b0c, #2a2426 72%, #8a3039);
  box-shadow: var(--shadow);
}

.download-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.16) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: linear-gradient(90deg, #000, transparent 60%);
}

.download-art {
  position: relative;
  min-height: 430px;
  display: grid;
  place-items: center;
}

.download-art img {
  position: relative;
  z-index: 3;
  border: 8px solid rgba(255, 255, 255, 0.11);
  border-radius: 36px;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.28);
}

.download-ring,
.download-ring::before,
.download-ring::after {
  position: absolute;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 50%;
}

.download-ring {
  width: 290px;
  height: 290px;
}

.download-ring::before,
.download-ring::after {
  content: "";
  inset: 35px;
}

.download-ring::after {
  inset: -48px;
  border-style: dashed;
}

.download-file {
  position: absolute;
  z-index: 4;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  color: #fff;
  background: rgba(15, 15, 16, 0.84);
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(10px);
  font: 700 0.58rem/1 Arial, sans-serif;
}

.download-file-apk {
  width: 50px;
  height: 58px;
  top: 83px;
  right: 78px;
  transform: rotate(9deg);
}

.download-file-tv {
  width: 62px;
  height: 50px;
  bottom: 76px;
  left: 72px;
  color: var(--mint);
  transform: rotate(-8deg);
}

.download-copy {
  position: relative;
  z-index: 2;
  align-self: center;
  padding: 60px 70px 60px 30px;
}

.download-copy h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(3.3rem, 5vw, 5.4rem);
  line-height: 0.94;
  letter-spacing: -0.07em;
}

.download-meta {
  display: flex;
  gap: 20px;
  margin: 26px 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.72rem;
}

.download-meta span {
  position: relative;
}

.download-meta span + span::before {
  content: "";
  position: absolute;
  top: 50%;
  left: -11px;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--mint);
}

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

.button-light:hover {
  background: var(--mint);
}

.faq-section {
  padding-top: 72px;
  background: var(--paper);
}

.faq-grid {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: 100px;
}

.faq-heading {
  position: sticky;
  top: 40px;
  align-self: start;
}

.faq-list {
  border-top: 1px solid var(--line);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  display: grid;
  grid-template-columns: 1fr 36px;
  align-items: center;
  gap: 20px;
  padding: 25px 0;
  cursor: pointer;
  font-family: var(--display);
  font-size: 1.08rem;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary span {
  position: relative;
  width: 32px;
  height: 32px;
  border: 1px solid var(--line);
  border-radius: 50%;
}

.faq-list summary span::before,
.faq-list summary span::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 11px;
  height: 1px;
  background: currentColor;
  transform: translate(-50%, -50%);
}

.faq-list summary span::after {
  transform: translate(-50%, -50%) rotate(90deg);
  transition: transform 180ms ease;
}

.faq-list details[open] summary span {
  color: #fff;
  background: var(--green);
}

.faq-list details[open] summary span::after {
  transform: translate(-50%, -50%);
}

.faq-list details p {
  margin: -8px 60px 28px 0;
  color: var(--sage);
  font-size: 0.88rem;
}

.safety-note {
  padding: 0 0 104px;
  background: var(--paper);
}

.safety-inner {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 20px;
  padding: 27px 30px;
  border: 1px solid rgba(213, 75, 87, 0.3);
  border-radius: 20px;
  background: var(--paper-green);
}

.safety-inner > svg {
  width: 42px;
  height: 42px;
  padding: 9px;
  border-radius: 12px;
  fill: none;
  stroke: var(--green-bright);
  stroke-width: 1.6;
  background: rgba(213, 75, 87, 0.12);
}

.safety-inner strong {
  font-size: 0.88rem;
}

.safety-inner p {
  margin: 5px 0 0;
  color: var(--sage);
  font-size: 0.76rem;
}

.safety-inner a {
  margin-left: 5px;
  color: var(--green-bright);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-footer {
  color: #fff;
  background: var(--ink);
}

.footer-inner {
  min-height: 128px;
  display: grid;
  grid-template-columns: 1fr 1.3fr 1fr;
  align-items: center;
  gap: 30px;
}

.footer-brand small {
  margin-top: 4px;
  color: var(--sage);
  font: 0.56rem/1.2 Arial, sans-serif;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-inner > p {
  margin: 0;
  color: var(--sage);
  font-size: 0.68rem;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: flex-end;
  gap: 22px;
  color: var(--sage);
  font-size: 0.7rem;
}

.footer-links a:hover {
  color: var(--green);
}

/* 手机端滚动后显示固定下载条。 */
.floating-download {
  position: fixed;
  right: 0;
  bottom: 14px;
  left: 0;
  z-index: 180;
  display: none;
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  transition: opacity 200ms ease, transform 200ms ease;
}

.floating-download.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.floating-inner {
  width: min(calc(100% - 24px), 620px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-inline: auto;
  padding: 10px 10px 10px 13px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 18px;
  color: #fff;
  background: rgba(8, 8, 9, 0.96);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(18px);
}

.floating-inner > div {
  display: flex;
  align-items: center;
  gap: 11px;
}

.floating-download small {
  color: var(--sage);
  font-size: 0.64rem;
}

/* 桌面端下载弹窗复用原站扫码流程。 */
.download-modal {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: grid;
  place-items: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 240ms ease, visibility 240ms ease;
}

.download-modal[hidden] {
  display: none;
}

.download-modal.is-open {
  opacity: 1;
  visibility: visible;
}

.download-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(3, 16, 22, 0.86);
}

.download-modal-panel {
  position: relative;
  z-index: 1;
  width: min(100%, 430px);
  padding: 34px 32px 26px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 26px;
  color: #fff;
  background:
    radial-gradient(circle at 90% 4%, rgba(213, 75, 87, 0.18), transparent 30%),
    var(--ink-soft);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.46);
  opacity: 0;
  transform: translate3d(0, 24px, 0) scale(0.96);
  transition: transform 320ms cubic-bezier(0.22, 1, 0.36, 1), opacity 220ms ease;
}

.download-modal.is-open .download-modal-panel {
  opacity: 1;
  transform: translate3d(0, 0, 0) scale(1);
}

.download-modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  padding: 0 0 2px;
  border: 1px solid var(--white-line);
  border-radius: 50%;
  color: var(--sage);
  background: rgba(255, 255, 255, 0.04);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}

.download-modal-close:hover {
  color: var(--ink);
  background: var(--green);
}

.download-modal-kicker {
  margin: 0 0 8px;
  color: var(--amber);
  font: 700 0.65rem/1.2 Arial, sans-serif;
  letter-spacing: 0.18em;
}

.download-modal-panel h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 1.75rem;
  letter-spacing: -0.04em;
}

.download-modal-panel > p:not(.download-modal-kicker) {
  margin: 8px 0 20px;
  color: var(--sage);
  font-size: 0.8rem;
}

.download-modal-code {
  margin: 0;
  padding: 12px;
  border-radius: 19px;
  background: #f6f6f6;
}

.download-modal-code img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  border-radius: 10px;
}

.download-modal-code figcaption {
  padding: 9px 4px 1px;
  color: #656264;
  font-size: 0.67rem;
  text-align: center;
}

.download-modal-footer {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-top: 18px;
}

.download-modal-footer > span {
  flex: 0 0 auto;
  color: var(--sage);
  font-size: 0.64rem;
}

.download-modal-footer a {
  color: var(--green);
  font-size: 0.72rem;
  font-weight: 700;
  text-align: right;
}

.download-modal-footer button {
  padding: 8px 14px;
  border: 0;
  border-radius: 9px;
  color: var(--ink);
  background: var(--green);
  font-size: 0.72rem;
  font-weight: 700;
  cursor: pointer;
}

/* 免责声明页面与主站共享导航和页脚。 */
.legal-page {
  background: var(--paper);
}

.legal-page .site-header {
  position: relative;
  background: var(--ink);
}

.legal-hero {
  padding: 84px 0 78px;
  color: #fff;
  background:
    radial-gradient(circle at 78% 20%, rgba(213, 75, 87, 0.16), transparent 28%),
    var(--ink);
}

.legal-hero h1 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(3.4rem, 7vw, 6rem);
  line-height: 1;
  letter-spacing: -0.065em;
}

.legal-hero > .container > p:not(.section-kicker) {
  max-width: 720px;
  margin: 24px 0 0;
  color: var(--sage);
}

.legal-update {
  display: flex;
  gap: 12px;
  margin-top: 30px;
  font-size: 0.72rem;
}

.legal-update span {
  color: var(--sage);
}

.legal-content {
  padding: 92px 0 110px;
}

.legal-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 70px;
}

.legal-summary {
  position: sticky;
  top: 30px;
  align-self: start;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #101011;
}

.legal-summary strong {
  font-family: var(--display);
}

.legal-summary p {
  margin: 10px 0;
  color: var(--sage);
  font-size: 0.78rem;
}

.legal-summary a {
  display: inline-block;
  margin-top: 8px;
  color: var(--green-bright);
  font-size: 0.76rem;
  font-weight: 700;
}

.legal-sections {
  display: grid;
  gap: 16px;
}

.legal-alert,
.legal-block {
  position: relative;
  padding: 34px 36px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #101011;
}

.legal-alert {
  border-color: rgba(213, 75, 87, 0.34);
  background: var(--paper-green);
}

.legal-alert h2,
.legal-block h2 {
  margin: 0 0 14px;
  font-family: var(--display);
  font-size: 1.22rem;
}

.legal-block > span {
  position: absolute;
  top: 36px;
  right: 36px;
  color: #777476;
  font: 700 0.62rem/1 Arial, sans-serif;
  letter-spacing: 0.1em;
}

.legal-alert p,
.legal-block p,
.legal-block li {
  color: var(--sage);
  font-size: 0.84rem;
}

.legal-alert p,
.legal-block p {
  margin: 0;
}

.legal-block p + p {
  margin-top: 12px;
}

.legal-block ul {
  margin: 12px 0 0;
  padding-left: 20px;
}

.legal-block a {
  color: var(--green-bright);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 独立安装页延续黑色基调，并用红色路径线串联操作步骤。 */
.install-page,
.install-page .site-header {
  background: var(--ink);
}

.install-page .site-header {
  position: relative;
}

.guide-hero {
  overflow: hidden;
  padding: 92px 0 104px;
  border-bottom: 1px solid var(--line);
  color: #fff;
  background:
    radial-gradient(circle at 82% 20%, rgba(213, 75, 87, 0.22), transparent 28%),
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    var(--ink);
  background-size: auto, 64px 64px, 64px 64px, auto;
}

.guide-hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 100px;
}

.guide-hero h1 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(4rem, 7vw, 7rem);
  line-height: 0.9;
  letter-spacing: -0.07em;
}

.guide-hero h1 em {
  color: var(--green);
  font-style: normal;
}

.guide-hero-grid > div:first-child > p:last-child {
  max-width: 680px;
  margin: 30px 0 0;
  color: var(--sage);
}

.guide-route {
  display: grid;
  padding: 28px;
  border: 1px solid var(--white-line);
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.035);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.42);
}

.guide-route > div {
  display: grid;
  grid-template-columns: 48px 1fr;
  align-items: center;
  gap: 3px 16px;
}

.guide-route span {
  width: 48px;
  height: 48px;
  grid-row: 1 / 3;
  display: grid;
  place-items: center;
  border: 1px solid rgba(213, 75, 87, 0.35);
  border-radius: 50%;
  color: var(--green-bright);
  background: rgba(213, 75, 87, 0.08);
  font: 700 0.65rem/1 Arial, sans-serif;
}

.guide-route strong {
  font-family: var(--display);
}

.guide-route small {
  color: var(--sage);
  font-size: 0.68rem;
}

.guide-route > i {
  width: 1px;
  height: 34px;
  margin: 8px 0 8px 24px;
  background: linear-gradient(var(--green), rgba(213, 75, 87, 0.12));
}

.guide-content {
  padding: 100px 0 112px;
  background: var(--paper);
}

.guide-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 70px;
}

.guide-nav {
  position: sticky;
  top: 30px;
  align-self: start;
  display: grid;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #101011;
}

.guide-nav > strong {
  margin-bottom: 10px;
  font-family: var(--display);
}

.guide-nav a {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  color: var(--sage);
  font-size: 0.74rem;
}

.guide-nav a:last-child {
  border-bottom: 0;
}

.guide-nav a:hover {
  color: var(--green-bright);
}

.guide-nav a span {
  color: #706d6f;
  font: 700 0.62rem/1.65 Arial, sans-serif;
}

.guide-sections {
  min-width: 0;
  display: grid;
  gap: 20px;
}

.guide-alert,
.guide-block,
.guide-finish {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: #101011;
}

.guide-alert {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 30px;
  padding: 28px 32px;
  border-color: rgba(213, 75, 87, 0.34);
  background: linear-gradient(120deg, rgba(213, 75, 87, 0.12), #101011 52%);
}

.guide-alert > span {
  color: var(--green-bright);
  font: 700 0.66rem/1.5 Arial, sans-serif;
  letter-spacing: 0.12em;
}

.guide-alert strong {
  font-family: var(--display);
}

.guide-alert p {
  margin: 6px 0 0;
  color: var(--sage);
  font-size: 0.8rem;
}

.guide-block {
  padding: 44px 46px;
  scroll-margin-top: 30px;
}

.guide-block > header {
  max-width: 720px;
  margin-bottom: 34px;
}

.guide-block > header > span,
.guide-finish span {
  color: var(--green);
  font: 700 0.64rem/1.2 Arial, sans-serif;
  letter-spacing: 0.16em;
}

.guide-block h2,
.guide-finish h2 {
  margin: 8px 0 10px;
  font-family: var(--display);
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1;
  letter-spacing: -0.05em;
}

.guide-block > header p,
.guide-finish p {
  margin: 0;
  color: var(--sage);
  font-size: 0.84rem;
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.check-grid article,
.trouble-grid article {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 17px;
  background: #151516;
}

.check-grid article > span {
  display: inline-block;
  margin-bottom: 28px;
  color: var(--green);
  font: 700 0.62rem/1 Arial, sans-serif;
  letter-spacing: 0.12em;
}

.check-grid strong,
.trouble-grid strong {
  display: block;
  font-family: var(--display);
  font-size: 0.92rem;
}

.check-grid p,
.trouble-grid p {
  margin: 7px 0 0;
  color: var(--sage);
  font-size: 0.74rem;
}

.guide-step-list,
.config-step-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-step-list li {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.guide-step-list li:first-child {
  padding-top: 0;
}

.guide-step-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.guide-step-list > li > span,
.config-step-list > li > span {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(213, 75, 87, 0.3);
  border-radius: 50%;
  color: var(--green);
  font: 700 0.64rem/1 Arial, sans-serif;
}

.guide-step-list h3 {
  margin: 2px 0 6px;
  font-family: var(--display);
  font-size: 1.05rem;
}

.guide-step-list p,
.config-step-list p {
  margin: 0;
  color: var(--sage);
  font-size: 0.8rem;
}

.config-step-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.config-step-list li {
  display: grid;
  grid-template-columns: 48px 1fr;
  align-items: start;
  gap: 16px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 17px;
  background: #151516;
}

.config-step-list strong {
  display: block;
  margin: 2px 0 5px;
  font-family: var(--display);
  font-size: 0.9rem;
}

.guide-path {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 24px;
  padding: 18px;
  border: 1px dashed rgba(213, 75, 87, 0.32);
  border-radius: 15px;
  color: var(--sage);
  font-size: 0.72rem;
}

.guide-path span {
  padding: 7px 10px;
  border-radius: 8px;
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.guide-path i {
  color: var(--green);
  font-style: normal;
}

.guide-source {
  margin: 18px 0 0;
  color: #777476;
  font-size: 0.68rem;
}

.guide-source a {
  color: var(--green-bright);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.trouble-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.guide-finish {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  padding: 42px 46px;
  background:
    radial-gradient(circle at 92% 12%, rgba(213, 75, 87, 0.22), transparent 30%),
    #101011;
}

.guide-finish h2 {
  font-size: clamp(1.8rem, 3vw, 2.7rem);
}

.guide-finish .button {
  flex: 0 0 auto;
}

:focus-visible {
  outline: 3px solid rgba(239, 100, 110, 0.6);
  outline-offset: 3px;
}

@keyframes breathe {
  50% {
    box-shadow: 0 0 0 8px rgba(213, 75, 87, 0.06);
  }
}

@keyframes slow-spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 1040px) {
  .hero-grid {
    grid-template-columns: 1fr 0.85fr;
    gap: 20px;
  }

  .hero-stage {
    transform: scale(0.87);
  }

  .fact-grid strong {
    font-size: 0.8rem;
  }

  .install-grid {
    gap: 60px;
  }

  .guide-hero-grid {
    gap: 50px;
  }

  .guide-layout {
    gap: 36px;
  }
}

@media (max-width: 820px) {
  .container {
    width: min(calc(100% - 30px), var(--container));
  }

  .header-inner {
    min-height: 76px;
    display: flex;
  }

  .brand {
    margin-right: auto;
  }

  .brand img {
    width: 38px;
    height: 38px;
  }

  .header-download {
    display: none;
  }

  .nav-toggle {
    position: relative;
    z-index: 102;
    width: 42px;
    height: 42px;
    display: grid;
    place-content: center;
    gap: 7px;
    padding: 0;
    border: 1px solid var(--white-line);
    border-radius: 12px;
    color: #fff;
    background: rgba(255, 255, 255, 0.05);
    cursor: pointer;
  }

  .nav-toggle span {
    width: 18px;
    height: 1px;
    display: block;
    background: currentColor;
    transition: transform 180ms ease;
  }

  .site-header.is-open .nav-toggle span:first-child {
    transform: translateY(4px) rotate(45deg);
  }

  .site-header.is-open .nav-toggle span:last-child {
    transform: translateY(-4px) rotate(-45deg);
  }

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 101;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    padding: 80px 28px;
    color: #fff;
    background: rgba(0, 0, 0, 0.98);
    opacity: 0;
    visibility: hidden;
    transition: opacity 180ms ease, visibility 180ms ease;
  }

  .guide-hero {
    padding: 72px 0 82px;
  }

  .guide-hero-grid,
  .guide-layout {
    grid-template-columns: 1fr;
  }

  .guide-hero-grid {
    gap: 48px;
  }

  .guide-content {
    padding: 72px 0 88px;
  }

  .guide-layout {
    gap: 24px;
  }

  .guide-nav {
    position: static;
    grid-template-columns: repeat(4, 1fr);
    gap: 0 16px;
  }

  .guide-nav > strong {
    grid-column: 1 / -1;
  }

  .guide-nav a {
    min-width: 0;
  }

  .site-header.is-open .site-nav {
    opacity: 1;
    visibility: visible;
  }

  .site-nav a {
    width: 100%;
    padding: 20px 0;
    border-bottom: 1px solid var(--white-line);
    font-family: var(--display);
    font-size: 1.5rem;
  }

  .hero {
    min-height: auto;
  }

  .hero-grid {
    min-height: auto;
    grid-template-columns: minmax(0, 1fr);
    padding-top: 132px;
  }

  .hero-copy {
    min-width: 0;
    padding-bottom: 0;
  }

  .hero h1 {
    font-size: clamp(3.2rem, 13vw, 5.4rem);
  }

  .hero-stage {
    min-width: 0;
    min-height: 630px;
    transform: scale(0.92);
  }

  .facts {
    margin-top: -12px;
  }

  .fact-grid {
    grid-template-columns: repeat(2, 1fr);
    padding: 16px 0;
  }

  .fact-grid > div {
    min-height: 78px;
    justify-content: center;
  }

  .fact-grid > div:nth-child(3),
  .fact-grid > div:nth-child(4) {
    border-top: 1px solid var(--white-line);
  }

  .section {
    padding: 88px 0;
  }

  .section-heading,
  .seo-intro-inner,
  .install-grid,
  .download-panel,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .section-heading {
    gap: 20px;
    margin-bottom: 38px;
  }

  .section-heading > span {
    justify-self: start;
  }

  .seo-intro-inner {
    gap: 18px;
  }

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

  .feature-card-large {
    grid-row: auto;
  }

  .install-grid {
    gap: 48px;
  }

  .download-panel {
    padding-bottom: 50px;
  }

  .download-art {
    min-height: 330px;
  }

  .download-copy {
    padding: 0 34px;
    text-align: center;
  }

  .download-meta {
    justify-content: center;
  }

  .faq-heading {
    position: static;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 22px;
    padding: 32px 0;
  }

  .footer-inner > p {
    text-align: left;
  }

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

  .floating-download {
    display: block;
  }

  .legal-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .legal-summary {
    position: static;
  }
}

@media (max-width: 520px) {
  .brand span {
    display: none;
  }

  .availability {
    width: auto;
    white-space: normal;
  }

  .hero-actions {
    display: grid;
  }

  .hero-actions .button {
    width: 100%;
  }

  .hero-points {
    gap: 12px 16px;
  }

  .hero-stage {
    min-height: 450px;
    margin: -4px 0 -20px;
    transform: scale(0.66);
  }

  .signal-orbit-one {
    transform: scale(0.9);
  }

  .version-card {
    right: -20px;
  }

  .remote-card {
    left: -20px;
  }

  .fact-grid > div {
    padding-inline: 15px;
  }

  .section-heading h2,
  .install-copy h2,
  .faq-heading h2 {
    font-size: 2.55rem;
  }

  .feature-card {
    padding: 28px;
  }

  .feature-card-large {
    min-height: 540px;
    padding-bottom: 260px;
  }

  .catalog-visual {
    right: 24px;
    bottom: 24px;
    left: 24px;
  }

  .install-preview {
    grid-template-columns: 46px 1fr;
    gap: 0 14px;
    padding: 8px 20px;
  }

  .download-section {
    padding-bottom: 44px;
  }

  .download-panel {
    border-radius: 24px;
  }

  .download-art {
    min-height: 290px;
    transform: scale(0.86);
  }

  .download-copy h2 {
    font-size: 3rem;
  }

  .download-meta {
    flex-wrap: wrap;
  }

  .download-copy .button {
    width: 100%;
  }

  .faq-section {
    padding-top: 44px;
  }

  .faq-list summary {
    font-size: 1rem;
  }

  .safety-note {
    padding-bottom: 72px;
  }

  .safety-inner {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .floating-inner {
    width: calc(100% - 16px);
  }

  .download-modal {
    padding: 14px;
  }

  .download-modal-panel {
    padding: 30px 22px 22px;
    border-radius: 22px;
  }

  .download-modal-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .download-modal-footer a,
  .download-modal-footer button {
    align-self: flex-end;
  }

  .legal-hero {
    padding: 68px 0 62px;
  }

  .legal-content {
    padding: 58px 0 80px;
  }

  .legal-alert,
  .legal-block {
    padding: 26px 22px;
  }

  .legal-block > span {
    top: 28px;
    right: 22px;
  }

  .guide-hero h1 {
    font-size: 3.7rem;
  }

  .guide-route,
  .guide-block,
  .guide-finish {
    padding: 26px 22px;
  }

  .guide-nav {
    grid-template-columns: 1fr 1fr;
  }

  .guide-alert {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 24px 22px;
  }

  .check-grid,
  .config-step-list,
  .trouble-grid {
    grid-template-columns: 1fr;
  }

  .guide-step-list li {
    grid-template-columns: 48px 1fr;
    gap: 14px;
  }

  .config-step-list li {
    padding: 18px;
  }

  .guide-finish {
    align-items: flex-start;
    flex-direction: column;
  }

  .guide-finish .button {
    width: 100%;
  }
}

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

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