:root {
  color-scheme: light dark;
  --paper: #f3f4ee;
  --surface: #fbfcf7;
  --canvas: #e6e8df;
  --ink: #1b1e19;
  --muted: #5e655b;
  --line: #d4d8cc;
  --primary: #59683e;
  --pressed: #45522d;
  --soft: #e4ead2;
  --focus: #6b7d31;
  --on-primary: #fff;
  --trust-bg: #1d2319;
  --trust-ink: #f2f5e9;
  --trust-muted: #bac3ad;
  --shadow: rgba(27, 30, 25, 0.13);
  --max: 1180px;
  font-family:
    ui-sans-serif,
    -apple-system,
    BlinkMacSystemFont,
    'SF Pro Text',
    'Segoe UI',
    'Microsoft YaHei',
    sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  scroll-behavior: smooth;
  scroll-padding-top: 28px;
  accent-color: var(--primary);
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
::selection {
  background: var(--primary);
  color: var(--on-primary);
}
:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 5px;
  border-radius: 3px;
}
a {
  color: var(--primary);
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}
a:hover {
  color: var(--pressed);
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
}
h1,
h2,
h3,
p,
figure,
dl,
dd {
  margin: 0;
}
h1,
h2,
h3 {
  line-height: 1.12;
  text-wrap: balance;
}
h1 {
  font-size: clamp(2.8rem, 5.2vw, 4.7rem);
  font-weight: 780;
  letter-spacing: -0.035em;
}
h2 {
  font-size: clamp(2.15rem, 4vw, 3.65rem);
  font-weight: 750;
  letter-spacing: -0.03em;
}
h3 {
  font-size: 1.16rem;
  line-height: 1.35;
  letter-spacing: -0.012em;
}
p {
  max-width: 72ch;
  text-wrap: pretty;
}
p + p {
  margin-top: 1em;
}
.wrap {
  width: min(var(--max), calc(100% - 64px));
  margin-inline: auto;
}
.skip {
  position: fixed;
  z-index: 10;
  top: 8px;
  left: 16px;
  transform: translateY(-180%);
  background: var(--surface);
  padding: 12px 18px;
}
.skip:focus {
  transform: none;
}
.site-header {
  display: flex;
  align-items: center;
  gap: 30px;
  min-height: 106px;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  text-decoration: none;
  flex-shrink: 0;
}
.brand img {
  width: 34px;
  height: 34px;
}
.brand span {
  font-size: 1.22rem;
  font-weight: 850;
  letter-spacing: -0.045em;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: auto;
}
.main-nav a,
.language {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 650;
  text-decoration: none;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.main-nav a:hover,
.language:hover,
.main-nav [aria-current='page'] {
  color: var(--ink);
  text-decoration: underline;
}
.language {
  white-space: nowrap;
  border-left: 1px solid var(--line);
  padding-left: 24px;
}
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  min-height: 50px;
  padding: 12px 22px;
  border-radius: 999px;
  background: var(--primary);
  color: var(--on-primary);
  font-size: 0.9rem;
  font-weight: 740;
  line-height: 1.4;
  text-decoration: none;
  transition: background 0.16s ease;
}
.button:hover {
  background: var(--pressed);
  color: var(--on-primary);
}
.button.secondary {
  background: transparent;
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
}
.button.secondary:hover {
  background: var(--canvas);
}
.text-link {
  font-weight: 680;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.text-link svg,
.button svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}
.actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.hero {
  display: grid;
  grid-template-columns: 0.94fr 1.16fr;
  gap: 56px;
  align-items: center;
  padding-block: 76px 68px;
  min-height: 675px;
}
.hero h1 {
  max-width: 11ch;
}
.hero-copy > p {
  font-size: 1.06rem;
  color: var(--muted);
  margin-top: 26px;
  max-width: 44ch;
}
.hero .actions {
  margin-top: 30px;
}
.hero .small {
  font-size: 0.77rem;
  margin-top: 15px;
  max-width: 44ch;
}
.hero-shot {
  min-width: 0;
}
.hero-shot a {
  display: block;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 22px 55px var(--shadow);
  transform: perspective(1600px) rotateY(-4deg);
  transition: transform 0.32s cubic-bezier(0.16, 1, 0.3, 1);
}
.hero-shot a:hover {
  transform: perspective(1600px) rotateY(0deg);
}
figcaption {
  color: var(--muted);
  font-size: 0.73rem;
  line-height: 1.6;
  margin-top: 18px;
  max-width: 70ch;
}
.trust {
  background: var(--trust-bg);
  color: var(--trust-ink);
}
.trust-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 46px;
  padding-block: 34px;
}
.trust h2 {
  font-size: 1rem;
  font-weight: 720;
}
.trust p {
  font-size: 0.86rem;
  color: var(--trust-muted);
  margin-top: 7px;
}
.section {
  padding-block: 100px;
}
.section + .section {
  border-top: 1px solid var(--line);
}
.section-intro {
  display: grid;
  grid-template-columns: 1fr 0.9fr;
  gap: 90px;
  align-items: start;
}
.section-intro p {
  color: var(--muted);
  font-size: 1.04rem;
  max-width: 48ch;
}
.feature-rows {
  margin-top: 52px;
  border-top: 1px solid var(--line);
}
.feature-row {
  display: grid;
  grid-template-columns: 0.7fr 1fr;
  gap: 72px;
  padding-block: 25px;
  border-bottom: 1px solid var(--line);
}
.feature-row p {
  color: var(--muted);
}
.statement {
  background: var(--canvas);
}
.statement .wrap {
  display: grid;
  grid-template-columns: 0.92fr 1fr;
  gap: 96px;
  align-items: center;
}
.statement p {
  color: var(--muted);
  margin-top: 24px;
  font-size: 1.06rem;
}
.statement .text-link {
  margin-top: 24px;
}
.task-flow {
  padding: 28px 0;
  border-block: 1px solid var(--line);
}
.task-flow li {
  list-style: none;
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 18px;
  align-items: start;
  padding: 17px 0;
}
.task-flow {
  counter-reset: task;
  margin: 0;
}
.task-flow li:before {
  counter-increment: task;
  content: counter(task);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--primary);
  border: 1px solid var(--line);
  border-radius: 50%;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
}
.task-flow strong {
  display: block;
  font-size: 1.05rem;
}
.task-flow span {
  display: block;
  margin-top: 3px;
  font-size: 0.87rem;
  color: var(--muted);
}
.sharing {
  display: grid;
  grid-template-columns: 1.04fr 0.86fr;
  gap: 90px;
  align-items: center;
}
.sharing figure {
  min-width: 0;
}
.sharing img {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 18px 45px var(--shadow);
}
.sharing p {
  margin-top: 23px;
  color: var(--muted);
}
.sharing .text-link {
  margin-top: 24px;
}
.platforms {
  margin-top: 42px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 42px;
}
.platform {
  border-block: 1px solid var(--line);
  padding-block: 26px;
}
.platform h2,
.platform h3 {
  font-size: 1.9rem;
  letter-spacing: -0.025em;
}
.platform p {
  margin-top: 10px;
  color: var(--muted);
}
.platform .status {
  font-size: 0.82rem;
  color: var(--primary);
  font-weight: 680;
}
.platform-note {
  margin-top: 24px;
  font-size: 0.9rem;
  color: var(--muted);
}
.faq-layout {
  display: grid;
  grid-template-columns: 0.7fr 1fr;
  gap: 100px;
}
.faqs details {
  border-bottom: 1px solid var(--line);
  padding-block: 21px;
}
.faqs details:first-child {
  border-top: 1px solid var(--line);
}
.faqs summary {
  position: relative;
  padding-right: 38px;
  font-weight: 680;
  cursor: pointer;
  list-style: none;
  line-height: 1.5;
  min-height: 30px;
}
.faqs summary::-webkit-details-marker {
  display: none;
}
.faqs summary:after {
  content: '';
  position: absolute;
  right: 8px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-right: 1.5px solid var(--primary);
  border-bottom: 1.5px solid var(--primary);
  transform: rotate(45deg);
  transition: transform 0.15s ease;
}
.faqs details[open] summary:after {
  transform: rotate(225deg);
  top: 14px;
}
.faqs p {
  color: var(--muted);
  font-size: 0.93rem;
  margin-top: 16px;
  padding-right: 24px;
}
.guide-list {
  margin-top: 38px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
}
.guide-list a {
  display: block;
  border-top: 1px solid var(--line);
  padding-top: 23px;
  text-decoration: none;
  color: var(--ink);
}
.guide-list a:hover h2,
.guide-list a:hover h3 {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 5px;
}
.guide-list p {
  color: var(--muted);
  margin-top: 12px;
  font-size: 0.92rem;
}
.guide-list svg {
  width: 20px;
  height: 20px;
  margin-top: 20px;
  color: var(--primary);
}
.contact {
  background: var(--soft);
  padding-block: 60px;
}
.contact .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 44px;
}
.contact h2 {
  font-size: clamp(2rem, 3vw, 3rem);
}
.contact p {
  margin-top: 16px;
  max-width: 58ch;
  color: var(--muted);
  font-size: 0.94rem;
}
.contact .button {
  flex-shrink: 0;
}
.site-footer {
  padding-block: 48px 30px;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 34px;
}
.footer-top p {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 12px;
}
.footer-links {
  display: flex;
  gap: 14px 25px;
  flex-wrap: wrap;
  justify-content: flex-end;
  max-width: 550px;
}
.footer-links a {
  font-size: 0.85rem;
  color: var(--muted);
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-top: 38px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 0.74rem;
  color: var(--muted);
}
.footer-bottom p {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}
.footer-bottom a {
  color: var(--muted);
}
.page-lead {
  padding-block: 66px 45px;
}
.page-lead h1 {
  max-width: 17ch;
}
.page-lead p {
  font-size: 1.1rem;
  color: var(--muted);
  margin-top: 24px;
  max-width: 64ch;
}
.page-lead .back {
  font-size: 0.84rem;
  margin-bottom: 26px;
  display: inline-block;
}
.page-content {
  padding-bottom: 90px;
}
.page-content > .actions {
  margin-top: 32px;
}
.page-content > .small {
  margin-top: 18px;
  color: var(--muted);
  font-size: 0.86rem;
}
.page-content .section {
  padding-block: 56px;
}
.page-content .section h2 {
  font-size: 2rem;
}
.page-content .section p {
  margin-top: 18px;
  color: var(--muted);
}
.requirements {
  max-width: 72ch;
  padding-left: 24px;
  margin-top: 24px;
  color: var(--muted);
}
.requirements li + li {
  margin-top: 14px;
}
.article-layout {
  display: grid;
  grid-template-columns: 235px minmax(0, 1fr);
  gap: 76px;
  padding-bottom: 90px;
}
.toc {
  align-self: start;
  position: sticky;
  top: 28px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}
.toc a {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
  padding-block: 8px;
  line-height: 1.5;
  text-decoration: none;
}
.toc a:hover {
  color: var(--primary);
  text-decoration: underline;
}
.prose section + section {
  margin-top: 44px;
}
.prose h2 {
  font-size: 1.55rem;
  letter-spacing: -0.02em;
  line-height: 1.3;
}
.prose p {
  margin-top: 15px;
  color: var(--muted);
  overflow-wrap: anywhere;
}
.prose .meta {
  font-size: 0.83rem;
  margin-bottom: 32px;
  margin-top: 0;
}
.prose .closing {
  margin-top: 45px;
  padding-top: 25px;
  border-top: 1px solid var(--line);
}
.support-grid {
  margin-top: 44px;
}
.facts-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.96rem;
}
.facts-table th,
.facts-table td {
  text-align: left;
  padding: 21px 20px 21px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.facts-table th {
  width: 25%;
  font-weight: 680;
}
.facts-table td {
  color: var(--muted);
}
.small {
  font-size: 0.83rem;
}
.notice {
  background: var(--soft);
  padding: 24px 28px;
  border-radius: 12px;
  margin-top: 38px;
  max-width: 75ch;
}
.notice p {
  color: var(--muted);
}
.notice strong {
  color: var(--ink);
}
[lang='zh-CN'] .hero h1 {
  max-width: none;
  font-size: clamp(2.8rem, 4.5vw, 3.9rem);
  line-height: 1.22;
  letter-spacing: -0.035em;
}
[lang='zh-CN'] h1,
[lang='zh-CN'] h2 {
  word-break: keep-all;
  overflow-wrap: break-word;
}
[lang='zh-CN'] .page-lead h1 {
  max-width: 19ch;
}
[lang='zh-CN'] .hero-copy > p {
  line-height: 1.9;
}
[lang='zh-CN'] h2 {
  line-height: 1.3;
}
[lang='zh-CN'] .section-intro {
  gap: 84px;
}
html {
  scrollbar-color: var(--line) var(--paper);
  scrollbar-width: thin;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #171b15;
    --surface: #20261d;
    --canvas: #242b20;
    --ink: #edf1e5;
    --muted: #b2bca8;
    --line: #3d4735;
    --primary: #bdce9b;
    --pressed: #d1dfb5;
    --soft: #283221;
    --focus: #d1dfb5;
    --on-primary: #1d2615;
    --trust-bg: #10150d;
    --trust-ink: #edf1e5;
    --trust-muted: #b2bea5;
    --shadow: rgba(0, 0, 0, 0.3);
  }
  .brand img {
    filter: invert(1);
  }
  .hero-shot a,
  .sharing img {
    background: #fff;
  }
}
@media (max-width: 1050px) {
  .site-header {
    gap: 22px;
  }
  .main-nav {
    gap: 19px;
  }
  .language {
    padding-left: 18px;
  }
  .hero {
    gap: 32px;
    min-height: 610px;
    padding-block: 58px;
  }
  .hero h1 {
    font-size: clamp(2.8rem, 5.2vw, 4rem);
  }
  .section-intro,
  .sharing,
  .statement .wrap,
  .faq-layout {
    gap: 48px;
  }
  .section {
    padding-block: 76px;
  }
  .feature-row {
    gap: 40px;
  }
}
@media (max-width: 760px) {
  :root {
    font-size: 16px;
  }
  .wrap {
    width: calc(100% - 40px);
  }
  .site-header {
    min-height: 0;
    padding-block: 20px 12px;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 11px 18px;
  }
  .brand span {
    font-size: 1.16rem;
  }
  .brand img {
    width: 30px;
    height: 30px;
  }
  .main-nav {
    grid-row: 2;
    grid-column: 1/-1;
    margin: 0;
    justify-content: space-between;
    gap: 10px;
  }
  .main-nav a {
    font-size: 0.84rem;
  }
  .language {
    grid-row: 1;
    grid-column: 2;
    padding-left: 14px;
    min-height: 36px;
    font-size: 0.82rem;
  }
  .hero {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-block: 40px 44px;
    min-height: 0;
  }
  .hero h1 {
    font-size: clamp(2.9rem, 9vw, 4.5rem);
    max-width: 13ch;
  }
  .hero-copy > p {
    margin-top: 22px;
    max-width: 48ch;
  }
  .hero .actions {
    margin-top: 25px;
  }
  .hero-shot a {
    transform: none;
    max-width: 640px;
  }
  .hero-shot figcaption {
    font-size: 0.72rem;
  }
  .trust-inner {
    grid-template-columns: 1fr;
    gap: 22px;
    padding-block: 30px;
  }
  .trust h2 {
    font-size: 1.05rem;
  }
  .trust p {
    margin-top: 3px;
  }
  .section {
    padding-block: 58px;
  }
  .section-intro,
  .statement .wrap,
  .sharing,
  .faq-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  [lang='zh-CN'] .section-intro {
    gap: 24px;
  }
  .section-intro h2 {
    max-width: 18ch;
  }
  .section-intro p {
    max-width: 68ch;
  }
  .feature-rows {
    margin-top: 32px;
  }
  .feature-row {
    grid-template-columns: 1fr;
    gap: 10px;
    padding-block: 23px;
  }
  .statement p {
    margin-top: 20px;
  }
  .task-flow {
    padding-block: 12px;
  }
  .sharing figure {
    order: 2;
  }
  .sharing-copy {
    order: 1;
  }
  .sharing p {
    margin-top: 20px;
  }
  .platforms {
    gap: 24px;
    margin-top: 30px;
  }
  .platform h2,
  .platform h3 {
    font-size: 1.6rem;
  }
  .platform p {
    font-size: 0.9rem;
  }
  .guide-list {
    grid-template-columns: 1fr;
    gap: 24px;
    margin-top: 28px;
  }
  .guide-list a {
    position: relative;
    padding-right: 28px;
  }
  .guide-list svg {
    position: absolute;
    top: 22px;
    right: 0;
    margin: 0;
  }
  .guide-list p {
    margin-top: 8px;
  }
  .contact {
    padding-block: 40px;
  }
  .contact .wrap {
    display: block;
  }
  .contact .button {
    margin-top: 24px;
  }
  .footer-top,
  .footer-bottom {
    display: block;
  }
  .footer-links {
    justify-content: flex-start;
    margin-top: 25px;
    gap: 14px 22px;
  }
  .footer-bottom p + p {
    margin-top: 12px;
  }
  .page-lead {
    padding-block: 40px 32px;
  }
  .page-lead h1 {
    font-size: clamp(2.6rem, 8vw, 3.6rem);
  }
  .page-lead p {
    font-size: 1rem;
  }
  .page-content {
    padding-bottom: 56px;
  }
  .article-layout {
    grid-template-columns: 1fr;
    gap: 35px;
    padding-bottom: 56px;
  }
  .toc {
    position: static;
    columns: 2;
    column-gap: 22px;
    padding-top: 12px;
  }
  .toc a {
    break-inside: avoid;
    font-size: 0.83rem;
  }
  .prose h2 {
    font-size: 1.45rem;
  }
  .facts-table th {
    width: 29%;
  }
  .facts-table th,
  .facts-table td {
    padding: 18px 12px 18px 0;
  }
  .page-content .section {
    padding-block: 40px;
  }
  .page-content .section h2 {
    font-size: 1.75rem;
  }
  .notice {
    padding: 22px;
  }
  .page-content .platforms {
    margin-top: 0;
  }
}
@media (max-width: 420px) {
  .platforms {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .platform + .platform {
    border-top: 0;
  }
  .hero h1 {
    font-size: 2.85rem;
  }
  .hero .actions {
    gap: 10px;
  }
  .button {
    padding-inline: 19px;
  }
  .toc {
    columns: 1;
  }
  .main-nav a {
    font-size: 0.79rem;
  }
  .main-nav {
    gap: 7px;
  }
  [lang='zh-CN'] .hero h1 {
    font-size: 2.8rem;
  }
  .hero .small {
    font-size: 0.77rem;
  }
  .facts-table th {
    width: 30%;
  }
}
@media (prefers-reduced-motion: reduce) {
  :root {
    scroll-behavior: auto;
  }
  *,
  *:before,
  *:after {
    transition: none !important;
    animation: none !important;
  }
  .hero-shot a,
  .hero-shot a:hover {
    transform: none;
  }
}
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.support-heading {
  font-size: 1.16rem;
  line-height: 1.35;
  letter-spacing: -0.012em;
}
.platform-note + .actions {
  margin-top: 18px;
}

.guide-list h2 {
  font-size: 1.16rem;
  line-height: 1.35;
  letter-spacing: -0.012em;
}