/* Approved Precision Product Studio concept; colors derive from shared semantic tokens. */
:root {
  --download-navy: color-mix(
    in srgb,
    var(--ds-color-brand-deep) 16%,
    color-mix(in srgb, var(--ds-color-text-primary) 65%, black)
  );
  --download-edge: color-mix(in srgb, var(--ds-color-brand-bright) 24%, transparent);
  --download-line: color-mix(in srgb, var(--ds-color-brand-primary) 13%, var(--ds-color-surface-raised));
  --download-muted: color-mix(in srgb, var(--ds-color-text-muted) 78%, var(--ds-color-brand-bright));
  --download-header-height: 81px;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--download-header-height) + var(--ds-space-6));
}
body {
  margin: 0;
  background: var(--ds-color-surface-raised);
  color: var(--ds-color-text-primary);
  font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  display: block;
  max-width: 100%;
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
[hidden] {
  display: none !important;
}
h1,
h2,
h3,
p {
  margin: 0;
}
ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.container {
  width: min(85.8%, 1232px);
  margin-inline: auto;
}
.svg-library {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}
.icon {
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
:focus-visible {
  outline: 3px solid var(--ds-color-brand-bright);
  outline-offset: 5px;
  border-radius: 4px;
}
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 10;
  padding: 12px 20px;
  border-radius: var(--ds-radius-active-sm);
  background: var(--ds-color-surface-raised);
  color: var(--ds-color-brand-primary);
  transform: translateY(-160%);
}
.skip-link:focus {
  transform: translateY(0);
}
.brand-stage {
  position: relative;
  isolation: isolate;
  background:
    radial-gradient(ellipse at 69% 46%, color-mix(in srgb, var(--ds-color-text-muted-on-dark) 12%, transparent), transparent 57%),
    radial-gradient(ellipse at 42% 104%, color-mix(in srgb, var(--ds-color-brand-bright) 10%, transparent), transparent 40%),
    linear-gradient(118deg, var(--download-navy), color-mix(in srgb, var(--ds-color-text-muted-on-dark) 6%, var(--download-navy)));
  color: var(--ds-color-text-on-dark);
}
.hero-backdrop {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}
.hero-backdrop::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 83% 48%, color-mix(in srgb, var(--ds-color-brand-primary) 24%, transparent), transparent 55%),
    linear-gradient(
      130deg,
      transparent 46%,
      color-mix(in srgb, var(--ds-color-brand-bright) 8%, transparent) 67%,
      transparent 85%
    );
}
.hero-light {
  position: absolute;
  top: 10%;
  right: -10%;
  width: 70%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(ellipse, color-mix(in srgb, var(--ds-color-brand-bright) 17%, transparent), transparent 68%);
  transform: translate3d(var(--glow-x, 0px), var(--glow-y, 0px), 0);
  will-change: transform;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  padding-top: env(safe-area-inset-top, 0px);
  border-bottom: 1px solid var(--download-edge);
  background: var(--download-navy);
  color: var(--ds-color-text-on-dark);
  transition: box-shadow var(--ds-motion-normal) var(--ds-easing-standard);
}
.site-header.is-scrolled {
  box-shadow: 0 8px 24px color-mix(in srgb, var(--download-navy) 24%, transparent);
}
.header-inner {
  min-height: 80px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--ds-space-8);
}
.brand {
  display: inline-flex;
  justify-self: start;
  align-items: center;
  min-height: 44px;
  gap: var(--ds-space-4);
  transition:
    opacity var(--ds-motion-normal),
    transform var(--ds-motion-normal) var(--ds-easing-emphasized);
}
.brand img {
  width: 156px;
  height: auto;
}
.brand-label {
  border-left: 1px solid var(--download-edge);
  padding-left: var(--ds-space-4);
  color: var(--ds-color-text-muted-on-dark);
  font-size: var(--ds-font-size-body-small);
  white-space: nowrap;
}
.navigation {
  --nav-index: 0;
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: center;
  padding: var(--ds-space-1);
  border: 1px solid var(--download-edge);
  border-radius: var(--ds-radius-active-md);
  background: color-mix(in srgb, var(--ds-color-text-on-dark) 4%, transparent);
  font-size: var(--ds-font-size-body);
  font-weight: 500;
}
.navigation-indicator {
  position: absolute;
  inset: var(--ds-space-1) auto var(--ds-space-1) var(--ds-space-1);
  width: calc((100% - var(--ds-space-2)) / 3);
  border-radius: var(--ds-radius-active-sm);
  background: color-mix(in srgb, var(--ds-color-brand-primary) 24%, var(--download-navy));
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--ds-color-brand-bright) 24%, transparent);
  transform: translateX(calc(var(--nav-index) * 100%));
  transition: transform var(--ds-motion-slow) var(--ds-easing-emphasized);
  pointer-events: none;
}
.navigation-indicator::after {
  content: '';
  position: absolute;
  inset: auto var(--ds-space-5) 0;
  height: 2px;
  background: var(--ds-color-brand-bright);
  border-radius: var(--ds-radius-active-sm);
}
.navigation > a {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding-inline: var(--ds-space-5);
  border-radius: var(--ds-radius-active-sm);
  white-space: nowrap;
  color: var(--ds-color-text-muted-on-dark);
  transition:
    color var(--ds-motion-normal),
    background var(--ds-motion-normal),
    transform var(--ds-motion-fast);
}
.navigation > a.current {
  color: var(--ds-color-text-on-dark);
  font-weight: 600;
}
.navigation > a:hover,
.navigation > a:focus-visible {
  color: var(--ds-color-text-on-dark);
  background: color-mix(in srgb, var(--ds-color-text-on-dark) 7%, transparent);
}
.navigation > a:focus-visible,
.header-web-link:focus-visible {
  outline-offset: 2px;
}
.header-web-link {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  gap: var(--ds-space-2);
  padding-inline: var(--ds-space-4);
  border: 1px solid color-mix(in srgb, var(--ds-color-text-on-dark) 22%, transparent);
  border-radius: var(--ds-radius-active-sm);
  font-size: var(--ds-font-size-body);
  font-weight: 500;
  white-space: nowrap;
  transition:
    background var(--ds-motion-normal),
    border-color var(--ds-motion-normal),
    transform var(--ds-motion-fast);
}
.header-web-link .icon {
  width: 20px;
  height: 20px;
  transition: transform var(--ds-motion-normal) var(--ds-easing-emphasized);
}
.header-web-link:hover {
  background: color-mix(in srgb, var(--ds-color-brand-bright) 16%, transparent);
  border-color: var(--ds-color-brand-bright);
}
.header-web-link:hover .icon {
  transform: translate(2px, -2px);
}
.brand:hover {
  opacity: 0.85;
}
.brand:active,
.navigation > a:active,
.header-web-link:active {
  transform: scale(0.97);
}
::selection {
  background: var(--ds-color-brand-primary);
  color: var(--ds-color-text-on-dark);
}
.hero {
  position: relative;
  min-height: calc(100svh - var(--download-header-height));
  display: grid;
  grid-template-columns: 52% 48%;
  grid-template-rows: 1fr auto;
  row-gap: var(--ds-space-6);
  padding-block: clamp(24px, 4svh, 48px) var(--ds-space-6);
}
.hero-copy {
  position: relative;
  z-index: 2;
  align-self: center;
  min-height: 620px;
}
.particle-canvas {
  position: absolute;
  top: calc(-1 * var(--download-header-height));
  left: 0;
  width: 100%;
  height: calc(100% + var(--download-header-height));
  z-index: 3;
  color: color-mix(in srgb, var(--ds-color-brand-bright) 40%, var(--ds-color-text-on-dark));
  pointer-events: none;
}
.particle-logo {
  width: min(100%, 520px);
  aspect-ratio: 169 / 58;
  margin-bottom: var(--ds-space-8);
}
.particle-logo-fallback {
  display: block;
  font-size: clamp(72px, 8vw, 128px);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.particle-logo.is-ready .particle-logo-fallback {
  visibility: hidden;
}
.hero h1 {
  font-size: clamp(32px, 3.4vw, 48px);
  line-height: 1.2;
  letter-spacing: -0.035em;
  font-weight: 700;
}
.hero h1 span {
  color: color-mix(in srgb, var(--ds-color-brand-bright) 35%, var(--ds-color-text-on-dark));
}
.hero-description {
  margin-top: var(--ds-space-5);
  max-width: 480px;
  color: color-mix(in srgb, var(--ds-color-text-muted-on-dark) 48%, var(--ds-color-text-on-dark));
  font-size: 18px;
  line-height: 1.65;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--ds-space-6);
  margin-top: var(--ds-space-6);
}
.download-button {
  position: relative;
  overflow: hidden;
  min-height: 64px;
  min-width: 300px;
  padding: var(--ds-space-4) var(--ds-space-6);
  gap: var(--ds-space-4);
  font-size: 18px;
  font-weight: 600;
  border-radius: calc(var(--ds-radius-active-md) - 4px);
}
.download-button svg.icon {
  width: 28px;
  height: 28px;
}
.download-button svg.download-arrow {
  width: 20px;
  height: 20px;
  margin-left: var(--ds-space-2);
}
.download-button::after {
  content: '';
  position: absolute;
  top: -10%;
  left: -40%;
  width: 25%;
  height: 120%;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--ds-color-text-on-dark) 24%, transparent), transparent);
  transform: skewX(-22deg) translateX(0);
  transition: transform calc(var(--ds-motion-slow) * 2) var(--ds-easing-emphasized);
  pointer-events: none;
}
.download-button:not([aria-disabled='true']):hover::after,
.download-button:not([aria-disabled='true']):focus-visible::after {
  transform: skewX(-22deg) translateX(650%);
}
.hero-web-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding-block: 8px;
  border-bottom: 1px solid var(--ds-color-brand-bright);
  font-size: var(--ds-font-size-body-large);
  font-weight: 500;
  white-space: nowrap;
  transition: color 150ms;
}
.hero-web-link:hover {
  color: var(--ds-color-brand-bright);
}
.hero-web-link .icon {
  width: 20px;
  height: 20px;
  transition: transform var(--ds-motion-normal);
}
.hero-web-link:hover .icon {
  transform: translate(2px, -2px);
}
.scan-block {
  display: flex;
  align-items: center;
  gap: var(--ds-space-5);
  min-height: 112px;
  margin-top: var(--ds-space-6);
}
.scan-block > div {
  min-width: 0;
}
.qr-link {
  width: 104px;
  height: 104px;
  flex-shrink: 0;
  padding: 4px;
  border-radius: var(--ds-radius-active-sm);
  background: var(--ds-color-surface-raised);
  box-shadow: 0 4px 12px color-mix(in srgb, black 8%, transparent);
  outline: 1px solid color-mix(in srgb, var(--ds-color-text-on-dark) 30%, transparent);
  outline-offset: 4px;
  transition:
    transform var(--ds-motion-normal) var(--ds-easing-emphasized),
    outline-color var(--ds-motion-normal);
}
.qr-link:hover,
.qr-link:focus-visible {
  transform: translateY(-2px) scale(1.04);
  outline-color: var(--ds-color-brand-bright);
}
.qr-link:focus-visible {
  outline-width: 3px;
}
.qr-link img,
.qr-link svg {
  width: 100%;
  height: 100%;
  border-radius: 4px;
}
.scan-title {
  font-size: var(--ds-font-size-body-large);
  font-weight: 600;
}
.scan-description {
  margin-top: 4px;
  font-size: var(--ds-font-size-body);
  font-variant-numeric: tabular-nums;
  color: var(--ds-color-text-muted-on-dark);
}
.scan-hint {
  margin-top: var(--ds-space-1);
  font-size: var(--ds-font-size-body-small);
  color: var(--ds-color-text-muted-on-dark);
}
.scan-block:not(:has(.qr-link:not([hidden]))) .scan-hint {
  visibility: hidden;
}
.wechat-note {
  max-width: 480px;
  font-size: 14px;
  margin-top: 20px;
  color: var(--ds-color-text-muted-on-dark);
}
.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
  align-self: stretch;
  min-width: 0;
  perspective: 1100px;
}
.phone-stage {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 100%;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
  transform: translate3d(var(--device-x, 0px), var(--device-y, 0px), var(--device-depth, 0px)) rotateX(var(--device-rx, 0deg))
    rotateY(var(--device-ry, 0deg));
  will-change: transform;
}
.phone-preview {
  position: relative;
  z-index: 2;
  width: min(104%, calc(max(440px, 100svh - var(--download-header-height) - 120px) * 0.599383));
  max-width: none;
  height: auto;
  aspect-ratio: 971 / 1620;
  overflow: visible;
  isolation: isolate;
  transform: translateZ(0);
  transform-style: flat;
}
.phone-frame {
  width: 100%;
  height: auto;
  filter: drop-shadow(12px 18px 22px color-mix(in srgb, var(--download-navy) 38%, transparent));
}
.scene-orbit {
  position: absolute;
  left: 50%;
  top: 50%;
  width: min(100%, calc(max(440px, 100svh - var(--download-header-height) - 150px)));
  height: auto;
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  overflow: visible;
  pointer-events: none;
}
.orbit-track {
  fill: none;
  stroke: color-mix(in srgb, var(--ds-color-brand-bright) 32%, transparent);
  stroke-width: 1;
  transition: stroke var(--ds-motion-normal);
}
.orbit-track-outer {
  stroke: color-mix(in srgb, var(--ds-color-brand-bright) 12%, transparent);
}
.orbit-meteor {
  transform-box: view-box;
  transform-origin: 0px 0px;
  animation: meteor-orbit 8s linear infinite;
}
.meteor-trail {
  fill: none;
  stroke: url(#meteor-tail);
  stroke-width: 2;
  stroke-linecap: round;
}
.meteor-head {
  fill: var(--ds-color-text-on-dark);
  filter: drop-shadow(0 0 4px var(--ds-color-brand-bright));
}
.meteor-tail-start {
  stop-color: var(--ds-color-brand-primary);
  stop-opacity: 0;
}
.meteor-tail-mid {
  stop-color: var(--ds-color-brand-bright);
  stop-opacity: 0.65;
}
.meteor-tail-end {
  stop-color: var(--ds-color-text-on-dark);
}
.orbit-meteor-outer {
  opacity: 0.65;
  animation-duration: 12s;
  animation-delay: -6s;
}
.hero-visual.is-orbit-paused .orbit-meteor {
  animation-play-state: paused;
}
@keyframes meteor-orbit {
  to {
    transform: rotate(360deg);
  }
}
.hero-visual.is-exploring .orbit-track:not(.orbit-track-outer) {
  stroke: color-mix(in srgb, var(--ds-color-brand-bright) 60%, var(--ds-color-text-on-dark));
}
.hero-footer {
  grid-column: 1 / -1;
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ds-space-4);
  padding-top: var(--ds-space-4);
  border-top: 1px solid var(--download-edge);
}
.hero-footer a {
  display: inline-flex;
  align-items: center;
  gap: var(--ds-space-3);
  min-height: 44px;
  font-size: var(--ds-font-size-body);
  color: var(--ds-color-text-muted-on-dark);
  transition: color var(--ds-motion-normal);
}
.hero-footer a:hover {
  color: var(--ds-color-text-on-dark);
}
.hero-footer .icon {
  width: 20px;
  height: 20px;
  transition: transform var(--ds-motion-normal);
}
.hero-explore .icon {
  transform: rotate(90deg);
}
.hero-explore:hover .icon {
  transform: translateY(3px) rotate(90deg);
}
/* 截图和机身共用 HTML 合成层；屏幕四角按原机框 971 × 1620 坐标校准。 */
.phone-screen-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 971px;
  height: 1620px;
  visibility: hidden;
  clip-path: path('M 239 210 L 816 170 L 737 1370 C 734 1426 709 1474 649 1480 L 184 1462 C 132 1459 103 1439 105 1380 Z');
  transform-origin: 0 0;
  transform: scale(var(--phone-scale, 1));
  pointer-events: none;
}
.phone-preview.is-ready .phone-screen-layer {
  visibility: visible;
}
.phone-screen {
  position: absolute;
  width: 390px;
  height: 844px;
  max-width: none;
  transform-origin: 0 0;
  transform: matrix3d(
    1.390840910864,
    -0.121032075194,
    0,
    -0.000108635133,
    -0.185167227506,
    1.304560969498,
    0,
    -0.000130983285,
    0,
    0,
    1,
    0,
    239,
    210,
    0,
    1
  );
}
.brand-relief {
  position: absolute;
  top: 18%;
  right: 0;
  width: 76%;
  height: auto;
  opacity: 0.06;
  filter: grayscale(1);
}
.channels-section {
  position: relative;
  padding-top: var(--ds-space-16);
  padding-bottom: 28px;
}
.section-heading {
  text-align: center;
}
.section-heading h2 {
  font-size: 40px;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.025em;
}
.section-heading p {
  color: var(--download-muted);
  font-size: 16px;
  margin-top: 8px;
}
.platform-list {
  display: grid;
}
.platform-row {
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: 28px;
  padding-inline: 24px;
  border-bottom: 1px solid var(--download-line);
}
.platform-icon {
  width: 40px;
  height: 40px;
  color: color-mix(in srgb, var(--ds-color-text-secondary) 85%, var(--ds-color-brand-primary));
}
.platform-name {
  font-size: 20px;
  font-weight: 600;
  color: var(--ds-color-text-secondary);
}
.platform-system {
  color: var(--download-muted);
  font-size: 16px;
}
.channel-status {
  margin-left: auto;
  color: var(--download-muted);
  font-size: 14px;
  font-weight: 400;
  white-space: nowrap;
}
a[aria-disabled='true'] {
  cursor: not-allowed;
}
.domestic-stores {
  padding-top: 20px;
}
.domestic-stores h3 {
  font-size: 24px;
  font-weight: 600;
  padding-inline: 24px;
  margin-bottom: 12px;
}
.store-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: repeat(3, auto);
  grid-auto-flow: column;
}
.store-grid li:nth-child(n + 4) {
  border-left: 1px solid var(--download-line);
}
.store-link {
  display: flex;
  align-items: center;
  min-height: 60px;
  padding-inline: 24px;
  gap: 20px;
}
.store-logo {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 8px;
}
.store-name {
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
}
.store-link .channel-status {
  font-size: 13px;
}
.help-section {
  background: linear-gradient(
    110deg,
    var(--ds-color-brand-50),
    color-mix(in srgb, var(--ds-color-brand-50) 45%, var(--ds-color-surface-raised))
  );
  padding-block: 36px;
}
.help-inner {
  display: grid;
  grid-template-columns: 0.57fr 1.1fr 1.03fr 0.9fr;
  align-items: start;
}
.help-inner > h2 {
  align-self: center;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.025em;
}
.help-item {
  display: flex;
  gap: 20px;
  padding-inline: 32px;
  border-left: 1px solid var(--download-line);
}
.help-item:last-child {
  padding-right: 0;
}
.help-icon {
  width: 36px;
  height: 36px;
  color: var(--ds-color-brand-primary);
}
.help-item h3 {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  margin-top: 2px;
}
.help-item p {
  margin-top: 8px;
  color: var(--download-muted);
  font-size: 14px;
  line-height: 1.6;
}
.help-item a:hover {
  color: var(--ds-color-brand-primary);
  text-decoration: underline;
}
.site-footer {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 84px;
  padding-bottom: env(safe-area-inset-bottom);
  color: var(--download-muted);
  font-size: 14px;
}
.footer-brand {
  margin-right: auto;
  color: var(--ds-color-text-primary);
  font-weight: 500;
  display: flex;
  align-items: center;
  min-height: 44px;
}
.site-footer nav {
  display: flex;
  align-items: center;
  gap: 24px;
}
.site-footer nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
}
.site-footer nav a + a {
  position: relative;
}
.site-footer nav a + a::before {
  content: '';
  position: absolute;
  left: -12px;
  height: 14px;
  border-left: 1px solid var(--download-line);
}
.site-footer a:hover {
  color: var(--ds-color-brand-primary);
}
@media (max-width: 1200px) {
  .brand-label {
    display: none;
  }
  .hero h1 {
    font-size: clamp(32px, 3.4vw, 44px);
  }
  .hero-description {
    font-size: 18px;
  }
  .hero-actions {
    gap: 28px;
    margin-top: 28px;
  }
  .download-button {
    min-width: 272px;
    padding: var(--ds-space-3) var(--ds-space-6);
    gap: var(--ds-space-3);
  }
  .download-button svg.icon:not(.download-arrow) {
    width: 32px;
    height: 32px;
  }
  .hero-web-link {
    font-size: 16px;
    gap: 6px;
  }
  .scan-block {
    margin-top: 32px;
    gap: 24px;
  }
  .qr-link {
    width: 112px;
    height: 112px;
  }
  .section-heading h2 {
    font-size: 32px;
  }
  .section-heading p {
    font-size: 14px;
  }
  .channels-section {
    padding-bottom: 28px;
  }
  .platform-row {
    min-height: 56px;
    gap: 24px;
  }
  .platform-icon {
    width: 32px;
    height: 32px;
  }
  .platform-name {
    font-size: 18px;
  }
  .platform-system {
    font-size: 14px;
  }
  .domestic-stores h3 {
    font-size: 22px;
  }
  .store-link {
    gap: 16px;
    padding-inline: 20px;
    min-height: 48px;
  }
  .store-logo {
    width: 34px;
    height: 34px;
  }
  .store-name {
    font-size: 13px;
  }
  .store-link .channel-status {
    font-size: 12px;
  }
  .help-item {
    padding-inline: 24px;
    gap: 16px;
  }
  .help-item h3 {
    font-size: 14px;
  }
  .help-item p {
    font-size: 13px;
  }
  .help-inner > h2 {
    font-size: 26px;
  }
  .help-icon {
    width: 30px;
    height: 30px;
  }
  .site-footer {
    font-size: 13px;
  }
}
@media (max-width: 1023px) {
  .container {
    width: calc(100% - 64px);
  }
  .hero h1 {
    font-size: clamp(30px, 3.8vw, 40px);
  }
  .hero-description {
    max-width: 360px;
    font-size: 16px;
  }
  .hero-actions {
    gap: 18px;
  }
  .download-button {
    min-height: 56px;
    min-width: 0;
    padding-inline: var(--ds-space-4);
    font-size: 15px;
  }
  .download-button svg.icon:not(.download-arrow) {
    width: 24px;
    height: 24px;
  }
  .hero-web-link {
    font-size: 14px;
  }
  .scan-title {
    font-size: 16px;
  }
  .scan-description {
    font-size: 14px;
  }
  .channels-section {
    padding-top: 96px;
  }
  .store-link {
    padding-inline: 12px;
    gap: 10px;
  }
  .store-name {
    font-size: 12px;
  }
  .store-link .channel-status {
    font-size: 11px;
  }
  .help-inner {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .help-inner > h2 {
    grid-column: 1 / -1;
  }
  .help-item {
    padding: 0 20px;
  }
  .help-item:nth-child(2) {
    border-left: 0;
    padding-left: 0;
  }
}
@media (max-width: 767px) {
  :root {
    --download-header-height: 125px;
  }
  .container {
    width: calc(100% - 40px);
  }
  .header-inner {
    min-height: 0;
    grid-template-columns: 1fr auto;
    gap: var(--ds-space-2) var(--ds-space-4);
    padding-block: var(--ds-space-2) var(--ds-space-3);
  }
  .brand img {
    width: 132px;
  }
  .navigation {
    grid-column: 1 / -1;
    grid-row: 2;
    font-size: var(--ds-font-size-body);
  }
  .navigation > a {
    padding-inline: var(--ds-space-2);
  }
  .header-web-link {
    font-size: var(--ds-font-size-body-small);
    padding-inline: var(--ds-space-3);
  }
  .header-web-link .icon {
    width: 16px;
    height: 16px;
  }
  .hero {
    grid-template-columns: 1fr;
    row-gap: var(--ds-space-4);
    padding-block: var(--ds-space-6) var(--ds-space-4);
  }
  .hero-copy {
    align-self: start;
    min-height: 0;
    text-align: center;
  }
  .particle-logo {
    max-width: 420px;
    margin-inline: auto;
    margin-bottom: var(--ds-space-6);
  }
  .particle-logo-fallback {
    font-size: clamp(64px, 19vw, 96px);
  }
  .hero h1 {
    font-size: clamp(28px, 7vw, 36px);
    line-height: 1.25;
  }
  .hero-description {
    font-size: 15px;
    margin: var(--ds-space-4) auto 0;
    max-width: 330px;
  }
  .hero-actions {
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--ds-space-5);
    gap: var(--ds-space-5);
  }
  .download-button {
    width: 100%;
    font-size: 16px;
    padding-inline: var(--ds-space-5);
  }
  .hero-web-link {
    display: none;
  }
  .scan-block {
    justify-content: center;
    text-align: left;
    margin-top: var(--ds-space-5);
    gap: var(--ds-space-5);
  }
  .qr-link {
    width: 104px;
    height: 104px;
  }
  .wechat-note {
    text-align: left;
    margin: 20px auto 0;
  }
  .hero-visual {
    position: absolute;
    bottom: 80px;
    right: 0;
    width: min(75%, 260px);
    height: auto;
    margin: 0;
    aspect-ratio: 971 / 1620;
    pointer-events: none;
  }
  .phone-stage {
    opacity: 0.16;
  }
  .phone-preview {
    width: 100%;
  }
  .scene-orbit {
    opacity: 0.3;
  }
  .brand-relief {
    display: none;
  }
  .hero-light {
    width: 140%;
    right: -50%;
    top: 20%;
  }
  .hero-footer a {
    font-size: var(--ds-font-size-body-small);
    gap: var(--ds-space-2);
  }
  .channels-section {
    padding-top: var(--ds-space-8);
    padding-bottom: 32px;
  }
  .section-heading h2 {
    font-size: 28px;
  }
  .section-heading p {
    max-width: 300px;
    margin-inline: auto;
    font-size: 13px;
    line-height: 1.6;
  }
  .platform-row {
    padding-inline: 4px;
    gap: 16px;
    min-height: 72px;
  }
  .platform-name {
    font-size: 17px;
  }
  .platform-system {
    font-size: 13px;
  }
  .channel-status {
    font-size: 12px;
  }
  .domestic-stores h3 {
    font-size: 20px;
    padding: 0;
    margin-bottom: 8px;
  }
  .store-grid {
    grid-template-columns: 1fr;
    grid-template-rows: none;
    grid-auto-flow: row;
  }
  .store-grid li:nth-child(n) {
    grid-column: auto;
    grid-row: auto;
    border-left: 0;
    border-bottom: 1px solid var(--download-line);
  }
  .store-link {
    gap: 16px;
    padding: 8px 4px;
    min-height: 60px;
  }
  .store-logo {
    width: 32px;
    height: 32px;
  }
  .store-name {
    font-size: 14px;
  }
  .store-link .channel-status {
    font-size: 12px;
  }
  .help-section {
    padding-block: 32px;
  }
  .help-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .help-inner > h2 {
    font-size: 24px;
    margin-bottom: 4px;
  }
  .help-item:nth-child(n) {
    border: 0;
    padding: 0;
    gap: 16px;
  }
  .help-item h3 {
    font-size: 15px;
  }
  .help-item p {
    font-size: 14px;
  }
  .site-footer {
    min-height: 108px;
    padding-block: 20px;
    gap: 4px 16px;
    flex-wrap: wrap;
    font-size: 12px;
  }
  .site-footer nav {
    gap: 20px;
  }
  .site-footer > p {
    flex-basis: 100%;
    text-align: right;
  }
}
@media (min-width: 768px) and (max-height: 800px) {
  .hero-copy {
    min-height: 530px;
  }
  .hero h1 {
    font-size: 36px;
  }
  .hero-description {
    font-size: var(--ds-font-size-body-large);
    margin-top: var(--ds-space-4);
  }
  .hero-actions,
  .scan-block {
    margin-top: var(--ds-space-5);
  }
  .download-button {
    min-height: 56px;
    font-size: var(--ds-font-size-body-large);
  }
}
@media (prefers-reduced-motion: reduce) {
  .download-button::after {
    display: none;
  }
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
  }
  .phone-stage,
  .hero-light {
    transform: none;
  }
  .orbit-meteor {
    animation: none;
  }
  .orbit-meteor-outer {
    transform: rotate(180deg);
  }
  .qr-link:hover,
  .qr-link:focus-visible,
  .hero-web-link:hover .icon {
    transform: none;
  }
  .hero-explore:hover .icon {
    transform: rotate(90deg);
  }
}

/* 下载入口状态与重试沿用现有正文层级，保持原生按钮键盘操作。 */
.download-retry {
  min-height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ds-color-text-on-dark);
  font: inherit;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

[data-apk-link][hidden] {
  display: none;
}