:root {
  color-scheme: dark;
  --navy-950: #031028;
  --navy-900: #06183a;
  --navy-850: #0a2148;
  --navy-800: #0d2c59;
  --blue-500: #176bff;
  --blue-400: #3e82ff;
  --cyan-400: #14d9e8;
  --cyan-300: #69edf4;
  --paper: #f4f7fb;
  --paper-strong: #ffffff;
  --ink: #071426;
  --mist-100: #e9f2ff;
  --mist-300: #b4c3d8;
  --mist-500: #8295b2;
  --line-dark: rgb(178 210 255 / 17%);
  --line-light: rgb(7 20 38 / 14%);
  --shell: min(1140px, calc(100vw - 48px));
  --radius-panel: 20px;
  --radius-control: 11px;
  --section-space: clamp(72px, 8vw, 96px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

:lang(ja),
:lang(ko),
:lang(zh-Hant) {
  line-break: strict;
  word-break: normal;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--navy-950);
  color: var(--mist-100);
  font-family: "Avenir Next", "Segoe UI", "Noto Sans", sans-serif;
  font-size: 16px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

:lang(ja) body,
body:lang(ja) {
  font-family: "Hiragino Sans", "Yu Gothic UI", "Noto Sans JP", sans-serif;
}

:lang(ko) body,
body:lang(ko) {
  font-family: "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
}

:lang(zh-Hant) body,
body:lang(zh-Hant) {
  font-family: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}

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

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

:focus-visible {
  outline: 2px solid var(--cyan-300);
  outline-offset: 3px;
}

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

section[id] {
  scroll-margin-top: 88px;
}

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--paper-strong);
  color: var(--ink);
  transform: translateY(-160%);
}

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

.site-header {
  position: sticky;
  z-index: 40;
  top: 0;
  border-bottom: 1px solid var(--line-dark);
  background: rgb(3 16 40 / 94%);
  backdrop-filter: blur(16px);
}

.header-inner {
  display: grid;
  min-height: 74px;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
}

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

.brand img {
  border: 1px solid rgb(105 237 244 / 35%);
  width: 38px;
  height: 38px;
  border-radius: 10px;
}

.brand span {
  display: grid;
  gap: 1px;
}

.brand strong {
  color: var(--paper-strong);
  font-size: 13px;
  letter-spacing: 0.2em;
}

.brand small {
  color: var(--mist-500);
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.primary-nav {
  display: flex;
  align-items: center;
}

.primary-nav {
  justify-content: center;
  gap: clamp(16px, 2.1vw, 26px);
}

.primary-nav a {
  position: relative;
  color: var(--mist-300);
  font-size: 12px;
  font-weight: 650;
  transition: color 180ms ease;
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
  color: var(--paper-strong);
}

.language-menu {
  position: relative;
  justify-self: end;
}

.language-menu > summary {
  display: inline-flex;
  min-width: 122px;
  min-height: 44px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 13px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-control);
  color: var(--mist-100);
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
  list-style: none;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.language-menu > summary::-webkit-details-marker {
  display: none;
}

.language-menu > summary:hover,
.language-menu > summary:focus-visible,
.language-menu[open] > summary {
  border-color: rgb(105 237 244 / 52%);
  background: rgb(20 217 232 / 7%);
}

.language-menu > summary i {
  width: 7px;
  height: 7px;
  border-right: 1.5px solid var(--mist-300);
  border-bottom: 1.5px solid var(--mist-300);
  transform: translateY(-2px) rotate(45deg);
  transition: transform 180ms var(--ease);
}

.language-menu[open] > summary i {
  transform: translateY(2px) rotate(225deg);
}

.language-popover {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 226px;
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: 14px;
  background: var(--navy-900);
  box-shadow: 0 22px 60px rgb(0 0 0 / 36%);
}

.language-popover ul {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 7px;
  list-style: none;
}

.language-popover a {
  display: flex;
  min-height: 42px;
  align-items: center;
  justify-content: space-between;
  padding: 0 11px;
  border-radius: 9px;
  color: var(--mist-300);
  font-size: 13px;
  font-weight: 650;
  transition: color 160ms ease, background-color 160ms ease;
}

.language-popover a:hover,
.language-popover a:focus-visible,
.language-popover a[aria-current="page"] {
  background: rgb(20 217 232 / 10%);
  color: var(--paper-strong);
}

.language-popover a[aria-current="page"]::before {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  margin-right: 9px;
  border-radius: 50%;
  background: var(--cyan-400);
  content: "";
}

.language-popover a span {
  margin-right: auto;
}

.language-popover small {
  color: var(--mist-500);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.hero-orbit {
  position: absolute;
  z-index: -1;
  border: 1px solid rgb(105 237 244 / 12%);
  border-radius: 50%;
  pointer-events: none;
}

.orbit-one {
  width: 540px;
  height: 540px;
  top: -270px;
  right: -230px;
}

.orbit-two {
  width: 380px;
  height: 380px;
  bottom: -220px;
  left: -150px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(420px, 1.08fr);
  align-items: center;
  gap: clamp(42px, 6vw, 78px);
  padding-block: 70px 82px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: var(--cyan-300);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.18em;
  line-height: 1.4;
}

.eyebrow > span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 0 6px rgb(20 217 232 / 10%);
}

.eyebrow.dark {
  color: var(--blue-500);
}

.hero h1 {
  max-width: 650px;
  margin: 0;
  color: var(--paper-strong);
  font-size: clamp(40px, 4.6vw, 60px);
  font-weight: 700;
  letter-spacing: -0.045em;
  line-height: 1.02;
  text-wrap: balance;
}

:lang(fr) .hero h1,
:lang(de) .hero h1,
:lang(es) .hero h1 {
  font-size: clamp(39px, 4.35vw, 57px);
}

:lang(ja) .hero h1,
:lang(ko) .hero h1,
:lang(zh-Hant) .hero h1 {
  font-size: clamp(38px, 4.25vw, 55px);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero h1 em {
  color: var(--cyan-300);
  font-style: normal;
  font-weight: 570;
}

.hero-lead {
  max-width: 650px;
  margin: 24px 0 0;
  color: var(--mist-300);
  font-size: clamp(16px, 1.25vw, 18px);
  line-height: 1.68;
  text-wrap: pretty;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 10px 17px;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  font-size: 13px;
  font-weight: 750;
  transition: transform 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.button:not([aria-disabled="true"]):hover,
.button:not([aria-disabled="true"]):focus-visible {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--blue-500);
  color: var(--paper-strong);
  cursor: default;
}

.button-secondary {
  border-color: var(--line-dark);
  color: var(--mist-100);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: rgb(105 237 244 / 52%);
  background: rgb(20 217 232 / 7%);
}

.hero-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 22px 0 0;
  padding: 0;
  color: var(--mist-500);
  font-size: 11px;
  list-style: none;
}

.hero-notes li::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 4px;
  margin: 0 8px 2px 0;
  border-radius: 50%;
  background: var(--cyan-400);
}

.receiver-stage {
  position: relative;
  padding: 16px 16px 12px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-panel);
  background: var(--navy-900);
  box-shadow: 0 30px 72px rgb(0 0 0 / 22%);
}

.stage-meta,
.stage-foot {
  display: flex;
  justify-content: space-between;
  color: var(--mist-500);
  font-size: 9px;
  font-weight: 750;
  letter-spacing: 0.15em;
}

.stage-meta {
  padding: 1px 3px 13px;
}

.stage-foot {
  padding: 11px 3px 1px;
}

.tv-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9.6;
  border: 1px solid rgb(255 255 255 / 14%);
  border-radius: 14px;
  background: #000b1b;
}

.tv-screen {
  position: relative;
  inset: 0;
  display: flex;
  height: 100%;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  padding: clamp(20px, 3.2vw, 34px);
  background: var(--navy-950);
}

.tv-screen::before,
.tv-screen::after {
  position: absolute;
  border: 1px solid rgb(105 237 244 / 10%);
  border-radius: 50%;
  content: "";
  pointer-events: none;
}

.tv-screen::before {
  width: 280px;
  height: 280px;
  top: -170px;
  right: -90px;
}

.tv-screen::after {
  width: 180px;
  height: 180px;
  right: -80px;
  bottom: -110px;
}

.screen-toolbar {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.screen-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--paper-strong);
  font-size: 10px;
  letter-spacing: 0.14em;
}

.screen-brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.receiver-status {
  display: inline-flex;
  align-self: flex-start;
  align-items: center;
  gap: 8px;
  color: var(--mist-100);
  font-size: 10px;
  font-weight: 700;
}

.receiver-status i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 0 6px rgb(20 217 232 / 10%);
}

.screen-copy {
  position: relative;
  z-index: 1;
  max-width: 440px;
  padding-block: 18px;
}

.screen-copy small {
  color: var(--cyan-300);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.screen-copy strong {
  display: block;
  margin-top: 8px;
  color: var(--paper-strong);
  font-size: clamp(22px, 2.6vw, 34px);
  line-height: 1.15;
  text-wrap: balance;
}

.screen-copy p {
  max-width: 380px;
  margin: 8px 0 0;
  color: var(--mist-300);
  font-size: 11px;
  line-height: 1.55;
  text-wrap: pretty;
}

.screen-modes {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.screen-modes li {
  padding: 6px 9px;
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  color: var(--mist-300);
  font-size: 9px;
}

.tv-stand {
  width: 74px;
  height: 7px;
  margin: 7px auto -2px;
  border-radius: 0 0 8px 8px;
  background: rgb(105 237 244 / 16%);
}

.capabilities,
.how-it-works,
.principles,
.faq,
.release {
  color: var(--ink);
}

.capabilities,
.principles,
.release {
  background: var(--paper);
}

.capabilities,
.how-it-works,
.compatibility,
.principles,
.faq,
.release {
  padding-block: var(--section-space);
}

.how-it-works,
.faq {
  background: var(--mist-100);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(320px, 0.62fr);
  column-gap: clamp(42px, 6vw, 74px);
  align-items: end;
}

.section-heading .eyebrow {
  grid-column: 1 / -1;
}

.section-heading h2,
.compact-heading h2,
.compatibility h2,
.principles h2,
.faq h2,
.release h2,
.support h2 {
  margin: 0;
  font-size: clamp(32px, 4vw, 48px);
  letter-spacing: -0.04em;
  line-height: 1.08;
  text-wrap: balance;
}

.section-heading > p:last-child,
.compact-heading > div > p,
.compatibility-intro > p,
.principles-intro > p:last-child,
.release-copy > p:last-child,
.support-inner > div > p:last-child {
  margin: 0;
  color: #53647c;
  font-size: 16px;
  line-height: 1.72;
  text-wrap: pretty;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 48px;
}

.capability-card {
  display: flex;
  min-height: 320px;
  flex-direction: column;
  padding: 25px;
  border: 1px solid var(--line-light);
  border-radius: var(--radius-panel);
  background: var(--paper-strong);
  transition: transform 220ms var(--ease), border-color 220ms ease;
}

.capability-card:hover {
  transform: translateY(-4px);
  border-color: rgb(23 107 255 / 35%);
}

.card-index {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  color: var(--blue-500);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.13em;
}

.card-index span:last-child {
  text-align: right;
}

.capability-card h3 {
  margin: 48px 0 0;
  font-size: 23px;
  letter-spacing: -0.025em;
  line-height: 1.18;
  text-wrap: balance;
}

.capability-card p {
  margin: 15px 0 0;
  color: #53647c;
  font-size: 15px;
  line-height: 1.68;
  text-wrap: pretty;
}

.capability-card small {
  margin-top: auto;
  padding-top: 22px;
  border-top: 1px solid var(--line-light);
  color: #65758a;
  font-size: 11px;
  line-height: 1.5;
}

.compact-heading {
  display: grid;
  grid-template-columns: minmax(150px, 0.38fr) minmax(0, 1fr);
  gap: clamp(34px, 6vw, 80px);
  align-items: start;
}

.compact-heading > div {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(300px, 0.65fr);
  gap: clamp(34px, 5vw, 68px);
  align-items: end;
}

.step-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 46px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
  list-style: none;
}

.step-list li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 14px;
  padding: 30px 24px;
}

.step-list li + li {
  border-left: 1px solid var(--line-light);
}

.step-list > li > span {
  color: var(--blue-500);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.step-list h3 {
  margin: 0;
  font-size: 20px;
  letter-spacing: -0.02em;
  line-height: 1.24;
  text-wrap: balance;
}

.step-list p {
  margin: 10px 0 0;
  color: #53647c;
  font-size: 14px;
  line-height: 1.65;
  text-wrap: pretty;
}

.compatibility {
  background: var(--navy-900);
}

.compatibility-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(480px, 1fr);
  gap: clamp(52px, 8vw, 102px);
  align-items: start;
}

.compatibility-intro {
  position: sticky;
  top: 104px;
}

.compatibility-intro > p {
  margin-top: 23px;
  color: var(--mist-300);
}

.compatibility-intro > small {
  display: block;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line-dark);
  color: var(--mist-500);
  font-size: 11px;
  line-height: 1.6;
  text-wrap: pretty;
}

.compatibility-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.compatibility-list li {
  min-height: 210px;
  padding: 24px;
  border: 1px solid var(--line-dark);
  border-radius: 16px;
  background: rgb(3 16 40 / 36%);
}

.compatibility-list h3 {
  margin: 0;
  color: var(--paper-strong);
  font-size: 19px;
}

.compatibility-list p {
  margin: 14px 0 0;
  color: var(--mist-300);
  font-size: 14px;
  line-height: 1.66;
  text-wrap: pretty;
}

.principles-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(420px, 0.82fr);
  gap: clamp(54px, 8vw, 110px);
}

.principles .eyebrow {
  color: var(--blue-500);
}

.principles-intro {
  position: sticky;
  top: 104px;
  align-self: start;
}

.principles-intro > p:last-child {
  margin-top: 24px;
}

.principle-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.principle-list li {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 18px;
  padding: 27px 0;
  border-top: 1px solid var(--line-light);
}

.principle-list li:last-child {
  border-bottom: 1px solid var(--line-light);
}

.principle-list > li > span {
  color: var(--blue-500);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.13em;
}

.principle-list h3 {
  margin: 0;
  color: var(--ink);
  font-size: 21px;
}

.principle-list p {
  margin: 9px 0 0;
  color: #53647c;
  font-size: 15px;
  text-wrap: pretty;
}

.faq-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.62fr) minmax(480px, 0.9fr);
  gap: clamp(54px, 8vw, 110px);
  align-items: start;
}

.faq-heading {
  position: sticky;
  top: 104px;
}

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

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

.faq-item > summary {
  display: grid;
  min-height: 70px;
  grid-template-columns: 1fr 22px;
  gap: 20px;
  align-items: center;
  color: var(--ink);
  cursor: pointer;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.42;
  list-style: none;
}

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

.faq-item > summary i {
  position: relative;
  width: 18px;
  height: 18px;
}

.faq-item > summary i::before,
.faq-item > summary i::after {
  position: absolute;
  top: 8px;
  left: 3px;
  width: 12px;
  height: 1px;
  background: var(--blue-500);
  content: "";
  transition: transform 180ms var(--ease);
}

.faq-item > summary i::after {
  transform: rotate(90deg);
}

.faq-item[open] > summary i::after {
  transform: rotate(0deg);
}

.faq-item > p {
  max-width: 680px;
  margin: -4px 42px 23px 0;
  color: #53647c;
  font-size: 14px;
  line-height: 1.7;
  text-wrap: pretty;
}

.release-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 0.7fr);
  gap: clamp(48px, 7vw, 88px);
  align-items: center;
}

.release-copy > p:last-child {
  margin-top: 23px;
}

.release-checks {
  padding: 25px;
  border: 1px solid var(--line-light);
  border-radius: var(--radius-panel);
  background: var(--paper-strong);
}

.release-checks > strong {
  display: block;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-light);
  color: #a24535;
  font-size: 10px;
  letter-spacing: 0.13em;
}

.release-checks ul {
  display: grid;
  gap: 16px;
  margin: 19px 0 0;
  padding: 0;
  list-style: none;
}

.release-checks li {
  position: relative;
  padding-left: 18px;
  color: #4b5c73;
  font-size: 14px;
  text-wrap: pretty;
}

.release-checks li::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 7px;
  height: 1px;
  background: var(--blue-500);
  content: "";
}

.support {
  padding-block: clamp(68px, 7vw, 82px);
  border-top: 1px solid var(--line-dark);
  background: var(--navy-850);
}

.support-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 54px;
}

.support h2 {
  max-width: 760px;
  font-size: clamp(30px, 3.4vw, 42px);
}

.support-inner > div > p:last-child {
  max-width: 700px;
  margin-top: 19px;
  color: var(--mist-300);
}

.button-light {
  min-width: 160px;
  background: var(--paper-strong);
  color: var(--ink);
}

footer {
  padding: 34px 0;
  border-top: 1px solid var(--line-dark);
  background: var(--navy-950);
}

.footer-grid {
  display: grid;
  grid-template-columns: 0.62fr 1.18fr auto;
  align-items: start;
  gap: 34px;
  color: var(--mist-500);
  font-size: 11px;
}

.footer-grid > div:first-child {
  display: grid;
}

.footer-grid strong {
  color: var(--paper-strong);
  letter-spacing: 0.16em;
}

.footer-grid p {
  margin: 0;
  text-wrap: pretty;
}

.footer-links {
  display: grid;
  justify-items: end;
  gap: 6px;
}

.footer-links a {
  color: var(--mist-300);
  transition: color 160ms ease;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--cyan-300);
}

.footer-filing-stack {
  display: grid;
  justify-items: start;
  gap: 6px;
  margin-top: 10px;
}

.footer-filing {
  color: var(--mist-300);
  font-size: 11px;
  transition: color 160ms ease;
}

.footer-filing:hover,
.footer-filing:focus-visible {
  color: var(--cyan-300);
}

@media (max-width: 1080px) {
  .primary-nav {
    display: none;
  }
}

@media (max-width: 900px) {
  :root {
    --shell: min(100% - 34px, 820px);
  }

  .header-inner {
    grid-template-columns: 1fr auto;
    gap: 16px;
  }

  .hero-grid,
  .section-heading,
  .compact-heading,
  .compact-heading > div,
  .compatibility-grid,
  .principles-grid,
  .faq-grid,
  .release-panel {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    gap: 48px;
    padding-top: 58px;
  }

  .receiver-stage {
    width: min(100%, 700px);
  }

  .section-heading {
    align-items: start;
  }

  .section-heading > p:last-child,
  .compact-heading > div > p {
    max-width: 680px;
    margin-top: 20px;
  }

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

  .capability-card {
    min-height: 280px;
  }

  .capability-card h3 {
    margin-top: 38px;
  }

  .step-list {
    grid-template-columns: 1fr;
  }

  .step-list li + li {
    border-top: 1px solid var(--line-light);
    border-left: 0;
  }

  .compatibility-intro,
  .principles-intro,
  .faq-heading {
    position: static;
  }

  .compatibility-list {
    margin-top: 38px;
  }

  .principle-list,
  .faq-list {
    margin-top: 34px;
  }

  .support-inner {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .button-light {
    justify-self: start;
  }

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

  .footer-links {
    justify-items: start;
  }
}

@media (max-width: 620px) {
  :root {
    --shell: calc(100% - 28px);
    --section-space: 60px;
  }

  .header-inner {
    grid-template-columns: 1fr auto;
    min-height: 66px;
    gap: 12px;
  }

  .brand small {
    display: none;
  }

  .language-menu > summary {
    min-width: 108px;
  }

  .language-popover {
    width: min(226px, calc(100vw - 28px));
  }

  .hero-grid {
    gap: 42px;
    padding-block: 48px 58px;
  }

  .hero h1 {
    font-size: clamp(37px, 11vw, 44px);
    line-height: 1.04;
  }

  :lang(ja) .hero h1,
  :lang(ko) .hero h1,
  :lang(zh-Hant) .hero h1 {
    font-size: clamp(34px, 10vw, 40px);
    line-height: 1.12;
  }

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

  .receiver-stage {
    padding: 12px 12px 9px;
  }

  .tv-screen {
    padding: 17px;
  }

  .screen-brand strong,
  .screen-copy p,
  .screen-modes,
  .stage-foot span:last-child {
    display: none;
  }

  .screen-copy strong {
    font-size: 21px;
  }

  .section-heading h2,
  .compact-heading h2,
  .compatibility h2,
  .principles h2,
  .faq h2,
  .release h2 {
    font-size: clamp(29px, 9vw, 37px);
  }

  .capability-card {
    min-height: 290px;
    padding: 22px;
  }

  .step-list li {
    grid-template-columns: 28px 1fr;
    padding: 24px 4px;
  }

  .compatibility-list {
    grid-template-columns: 1fr;
  }

  .compatibility-list li {
    min-height: auto;
    padding: 22px;
  }

  .principle-list li {
    grid-template-columns: 34px 1fr;
    gap: 12px;
  }

  .support {
    padding-block: 60px;
  }

  .support-inner {
    gap: 30px;
  }

  .button-light {
    width: 100%;
  }

  .faq-item > summary {
    min-height: 64px;
    font-size: 16px;
  }
}

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

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