:root {
  --canvas: #f4f3ef;
  --surface: #fbfaf7;
  --card: #fff;
  --ink: #202126;
  --muted: #71737b;
  --line: #dfded8;
  --primary: #5961d4;
  --primary-dark: #444cac;
  --primary-soft: #eceefe;
  --green: #17826c;
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  color: var(--ink);
  background:
    radial-gradient(circle at 82% -5%, rgb(217 218 255 / 72%), transparent 34rem),
    radial-gradient(circle at -8% 30%, rgb(228 244 237 / 58%), transparent 30rem),
    var(--canvas);
}
a { color: inherit; }
img { max-width: 100%; }
.shell { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgb(32 33 38 / 7%);
  background: rgb(244 243 239 / 83%);
  backdrop-filter: blur(22px);
}
.nav {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 21px;
  font-weight: 850;
  letter-spacing: -.035em;
  text-decoration: none;
}
.brand img {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 9px 20px rgb(89 97 212 / 23%);
}
.nav-links { display: flex; align-items: center; gap: 24px; }
.nav-actions { display: flex; align-items: center; gap: 16px; }
.nav-links a {
  color: #5d5f67;
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}
.nav-links a:hover { color: var(--ink); }
.site-language-picker {
  min-height: 42px;
  padding: 0 11px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid rgb(32 33 38 / 11%);
  border-radius: 13px;
  color: #555861;
  background: rgb(255 255 255 / 68%);
}
.site-language-picker:focus-within {
  border-color: rgb(89 97 212 / 55%);
  box-shadow: 0 0 0 3px rgb(89 97 212 / 12%);
}
.site-language-picker svg {
  width: 17px;
  height: 17px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}
.site-language-picker select {
  width: 96px;
  max-width: none;
  border: 0;
  outline: 0;
  color: inherit;
  background: transparent;
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.button,
.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 19px;
  border: 1px solid transparent;
  border-radius: 14px;
  font-size: 14px;
  font-weight: 750;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}
.nav-cta,
.button.primary {
  color: #fff;
  background: var(--primary);
  box-shadow: 0 12px 28px rgb(89 97 212 / 22%);
}
.button.secondary {
  border-color: #d8d7d2;
  background: rgb(255 255 255 / 70%);
}
.button.status { gap: 9px; cursor: default; }
.status-dot {
  width: 8px;
  height: 8px;
  border: 2px solid rgb(255 255 255 / 76%);
  border-radius: 50%;
}
.button:hover,
.nav-cta:hover { transform: translateY(-1px); }
.hero {
  min-height: 720px;
  padding: 92px 0 76px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, .9fr);
  align-items: center;
  gap: 72px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.eyebrow::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 5px rgb(23 130 108 / 11%);
}
h1 {
  max-width: 700px;
  margin: 0;
  font-size: clamp(48px, 6.4vw, 78px);
  line-height: 1.04;
  letter-spacing: -.065em;
}
.hero-copy {
  max-width: 620px;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.75;
}
.hero-actions { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 12px; }
.hero-note { margin: 19px 0 0; color: #95969d; font-size: 13px; }
.phone-stage { position: relative; min-height: 566px; display: grid; place-items: center; }
.halo {
  position: absolute;
  inset: 4% -7% 0;
  border-radius: 50%;
  background: radial-gradient(circle, rgb(89 97 212 / 18%), transparent 66%);
  filter: blur(10px);
}
.phone {
  width: min(100%, 382px);
  position: relative;
  z-index: 1;
  padding: 12px;
  border: 1px solid rgb(255 255 255 / 78%);
  border-radius: 42px;
  background: #23242a;
  box-shadow: 0 38px 90px rgb(42 45 74 / 27%);
  transform: rotate(2deg);
}
.phone-screen {
  min-height: 540px;
  padding: 26px 20px 20px;
  overflow: hidden;
  border-radius: 32px;
  background: #faf9f5;
}
.phone-bar { display: flex; align-items: center; justify-content: space-between; }
.mini-brand { display: flex; align-items: center; gap: 9px; font-weight: 830; }
.mini-brand img { width: 30px; height: 30px; border-radius: 9px; }
.avatar { width: 30px; height: 30px; border-radius: 50%; background: #22242b; }
.source-card {
  margin-top: 24px;
  padding: 17px;
  border: 1px solid #888ede;
  border-radius: 19px;
  background: #f8f8ff;
  box-shadow: 0 10px 26px rgb(74 80 150 / 9%);
}
.source-card small { color: #909199; }
.source-title { margin-top: 7px; display: flex; align-items: center; gap: 10px; }
.source-color { width: 5px; height: 32px; border-radius: 8px; background: #8964d8; }
.source-title strong { min-width: 0; flex: 1; font-size: 18px; }
.link-status { color: var(--green); font-size: 18px; font-weight: 850; }
.calendar-head {
  margin: 21px 0 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.calendar-head strong { font-size: 14px; }
.calendar-head span { color: #92939a; font-size: 11px; }
.week {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 5px;
  padding: 10px;
  border: 1px solid #e4e2dc;
  border-radius: 18px;
  background: white;
}
.day { min-width: 0; text-align: center; }
.day b { display: block; margin-bottom: 9px; color: #777982; font-size: 9px; }
.event {
  min-height: 58px;
  padding: 7px 4px;
  border-radius: 8px;
  color: #4e55bd;
  background: #eceefe;
  font-size: 8px;
  font-weight: 750;
  line-height: 1.35;
}
.event.green { color: #176f5d; background: #e7f5f0; transform: translateY(50px); }
.event.orange { color: #a16520; background: #fff1df; transform: translateY(100px); }
.event.red { color: #a74656; background: #fdebee; transform: translateY(18px); }
.event.blue { color: #3974aa; background: #eaf3fb; transform: translateY(120px); }
.trust {
  padding: 22px 0 80px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.trust-item,
.feature-card,
.step,
.plan {
  border: 1px solid rgb(32 33 38 / 8%);
  background: rgb(255 255 255 / 75%);
  box-shadow: 0 18px 50px rgb(36 38 55 / 5%);
}
.trust-item { padding: 22px; border-radius: 20px; }
.trust-item strong { display: block; margin-bottom: 6px; }
.trust-item span { color: var(--muted); font-size: 13px; line-height: 1.55; }
.section { padding: 96px 0; }
.section.alt { border-block: 1px solid rgb(32 33 38 / 6%); background: rgb(251 250 247 / 66%); }
.section-head { max-width: 700px; margin-bottom: 46px; }
.section-head h2 {
  margin: 0;
  font-size: clamp(36px, 5vw, 54px);
  line-height: 1.12;
  letter-spacing: -.05em;
}
.section-head p { margin: 17px 0 0; color: var(--muted); font-size: 17px; line-height: 1.7; }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { min-height: 282px; padding: 30px; border-radius: 25px; }
.icon {
  width: 48px;
  height: 48px;
  border-radius: 15px;
  color: var(--primary-dark);
  background: var(--primary-soft);
  display: grid;
  place-items: center;
  font-size: 22px;
  font-weight: 800;
}
.feature-card h3 { margin: 25px 0 10px; font-size: 21px; letter-spacing: -.025em; }
.feature-card p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.75; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: steps; }
.step { min-height: 224px; padding: 28px; border-radius: 24px; counter-increment: steps; }
.step::before {
  content: "0" counter(steps);
  color: var(--primary);
  font-size: 13px;
  font-weight: 850;
  letter-spacing: .08em;
}
.step h3 { margin: 42px 0 10px; font-size: 22px; }
.step p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; align-items: stretch; }
.plans.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.plan { padding: 29px; border-radius: 25px; }
.plan.featured { border-color: #858bde; background: #f8f8ff; box-shadow: 0 20px 60px rgb(76 81 150 / 12%); }
.plan-label { color: var(--muted); font-size: 13px; font-weight: 750; }
.plan h3 { margin: 10px 0 6px; font-size: 32px; letter-spacing: -.04em; }
.plan > p { min-height: 48px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.65; }
.plan ul { margin: 25px 0 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.plan li { font-size: 14px; }
.plan li::before { content: "✓"; margin-right: 9px; color: var(--green); font-weight: 900; }
.principle {
  padding: 54px;
  border-radius: 32px;
  color: white;
  background: #242631;
  display: grid;
  grid-template-columns: 1fr .78fr;
  align-items: center;
  gap: 50px;
  box-shadow: 0 30px 80px rgb(28 30 42 / 18%);
}
.principle h2 { margin: 0; font-size: clamp(34px, 4vw, 50px); line-height: 1.13; letter-spacing: -.05em; }
.principle p { margin: 18px 0 0; color: #bec0c9; line-height: 1.75; }
.principle-list { display: grid; gap: 12px; }
.principle-list div { padding: 15px 17px; border: 1px solid rgb(255 255 255 / 10%); border-radius: 14px; background: rgb(255 255 255 / 5%); font-size: 14px; }
.site-footer { padding: 58px 0 40px; }
.footer-grid { display: flex; align-items: flex-start; justify-content: space-between; gap: 30px; }
.footer-copy p { max-width: 370px; margin: 14px 0 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-links a { color: var(--muted); font-size: 13px; text-decoration: none; }
.copyright { margin-top: 42px; padding-top: 20px; border-top: 1px solid var(--line); color: #999aa1; font-size: 12px; }
.legal-main { min-height: 70vh; padding: 54px 0 96px; }
.legal-card {
  width: min(800px, 100%);
  margin: 0 auto;
  padding: clamp(28px, 6vw, 58px);
  border: 1px solid rgb(32 33 38 / 8%);
  border-radius: 28px;
  background: rgb(255 255 255 / 82%);
  box-shadow: 0 24px 70px rgb(36 38 55 / 7%);
}
.legal-card h1 { font-size: clamp(38px, 7vw, 58px); }
.effective { margin: 14px 0 38px; color: #96979e; font-size: 13px; }
.legal-card h2 { margin: 36px 0 12px; font-size: 23px; letter-spacing: -.025em; }
.legal-card p,
.legal-card li { color: #565860; line-height: 1.85; }
.legal-card a { color: var(--primary-dark); }
.support-box { margin-top: 28px; padding: 22px; border-radius: 18px; background: var(--primary-soft); }
.privacy-language-links { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: 13px; }
.privacy-language-links a { color: var(--primary-dark); font-weight: 750; text-decoration: none; }
.privacy-language-links a[aria-current="true"] { color: var(--ink); }

.help-main { padding: 54px 0 96px; }
.help-hero { max-width: 850px; margin-bottom: 40px; }
.help-hero h1 { font-size: clamp(42px, 7vw, 68px); }
.help-hero > p:not(.eyebrow) {
  max-width: 720px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.75;
}
.help-callout {
  margin-top: 30px;
  padding: 20px 22px;
  display: flex;
  gap: 15px;
  border: 1px solid rgb(89 97 212 / 15%);
  border-radius: 20px;
  background: rgb(236 238 254 / 78%);
}
.help-callout-icon {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: white;
  background: var(--primary);
  font-size: 13px;
  font-weight: 850;
}
.help-callout strong { display: block; margin-top: 3px; }
.help-callout p { margin: 7px 0 0; color: #62646d; font-size: 14px; line-height: 1.65; }
.help-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  align-items: start;
  gap: 34px;
}
.help-nav {
  position: sticky;
  top: 100px;
  padding: 18px;
  display: grid;
  gap: 4px;
  border: 1px solid rgb(32 33 38 / 8%);
  border-radius: 20px;
  background: rgb(255 255 255 / 72%);
}
.help-nav strong { padding: 7px 10px 11px; font-size: 13px; }
.help-nav a {
  padding: 10px;
  border-radius: 10px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
  text-decoration: none;
}
.help-nav a:hover { color: var(--primary-dark); background: var(--primary-soft); }
.help-content { min-width: 0; display: grid; gap: 22px; }
.platform-card {
  scroll-margin-top: 100px;
  padding: clamp(25px, 5vw, 42px);
  border: 1px solid rgb(32 33 38 / 8%);
  border-radius: 28px;
  background: rgb(255 255 255 / 82%);
  box-shadow: 0 20px 60px rgb(36 38 55 / 5%);
}
.platform-heading { display: flex; align-items: center; gap: 15px; margin-bottom: 28px; }
.platform-heading p {
  margin: 0 0 3px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: .04em;
}
.platform-heading h2 { margin: 0; font-size: clamp(25px, 4vw, 34px); letter-spacing: -.035em; }
.platform-icon {
  width: 48px;
  height: 48px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: 15px;
  color: #fff;
  background: #22242b;
  font-size: 19px;
  font-weight: 850;
}
.platform-icon.android { background: #26875f; }
.platform-icon.windows { background: #3074bd; }
.platform-icon.china { background: #c76739; }
.platform-icon.other { background: var(--primary); }
.platform-icon.faq { color: var(--primary-dark); background: var(--primary-soft); }
.platform-card h3 { margin: 28px 0 12px; font-size: 18px; }
.platform-card > p { color: #5c5e66; line-height: 1.8; }
.instruction-list { margin: 0; padding-left: 26px; display: grid; gap: 12px; }
.instruction-list li { padding-left: 5px; color: #50525a; line-height: 1.7; }
.instruction-list li::marker { color: var(--primary); font-weight: 800; }
.version-note { margin: 16px 0 0; color: #85868e !important; font-size: 13px; }
.warning-box,
.info-box {
  margin: 20px 0;
  padding: 16px 18px;
  border-radius: 15px;
  font-size: 14px;
  line-height: 1.65;
}
.warning-box { color: #835225; background: #fff1df; }
.info-box { color: #4d529a; background: var(--primary-soft); }
.official-link {
  margin-top: 24px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--primary-dark);
  font-size: 14px;
  font-weight: 750;
  text-decoration: none;
}
.official-link:hover { text-decoration: underline; }
.choice-grid { margin: 24px 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.choice-card { padding: 19px; border: 1px solid var(--line); border-radius: 17px; background: #fbfaf7; }
.choice-card strong { display: block; }
.choice-card p { margin: 9px 0 0; color: var(--muted); font-size: 13px; line-height: 1.65; }
.choice-card a { margin-top: 12px; display: inline-block; color: var(--primary-dark); font-size: 13px; font-weight: 750; }
.keyword-list { margin: 22px 0; padding: 0; display: flex; flex-wrap: wrap; gap: 9px; list-style: none; }
.keyword-list li { padding: 9px 12px; border-radius: 11px; color: #565db7; background: var(--primary-soft); font-size: 13px; font-weight: 700; }
.faq-card details { border-top: 1px solid var(--line); }
.faq-card details:last-child { border-bottom: 1px solid var(--line); }
.faq-card summary { padding: 18px 2px; cursor: pointer; font-weight: 720; }
.faq-card details p { margin: -4px 0 18px; color: var(--muted); line-height: 1.75; }
.help-contact {
  padding: 20px 4px 2px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-top: 1px solid var(--line);
}
.help-contact h2 { margin: 0; font-size: 15px; letter-spacing: -.01em; }
.help-contact p { max-width: 560px; margin: 5px 0 0; color: var(--muted); font-size: 13px; line-height: 1.6; }
.help-feedback-link {
  flex: 0 0 auto;
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 720;
  text-decoration: none;
  white-space: nowrap;
}
.help-feedback-link:hover { text-decoration: underline; }

@media (max-width: 900px) {
  .nav-links a:not(.nav-cta) { display: none; }
  .hero { min-height: auto; padding-top: 72px; grid-template-columns: 1fr; gap: 54px; }
  .hero-copy { max-width: 680px; }
  .phone-stage { min-height: 520px; }
  .trust, .features, .steps, .plans, .plans.two { grid-template-columns: 1fr; }
  .trust { padding-top: 0; }
  .feature-card { min-height: auto; }
  .principle { grid-template-columns: 1fr; }
  .help-layout { grid-template-columns: 1fr; }
  .help-nav {
    position: static;
    display: flex;
    gap: 7px;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .help-nav::-webkit-scrollbar { display: none; }
  .help-nav strong { display: none; }
  .help-nav a { flex: 0 0 auto; background: rgb(255 255 255 / 70%); }
  .choice-grid { grid-template-columns: 1fr; }
}

@media (max-width: 580px) {
  .shell { width: min(100% - 28px, 1160px); }
  .nav { min-height: 68px; gap: 12px; }
  .nav-actions { gap: 8px; }
  .nav-cta { display: none; }
  .site-language-picker { min-height: 38px; padding-inline: 9px; }
  .site-language-picker select { width: 88px; max-width: none; font-size: 12px; }
  .hero { padding-top: 54px; }
  .halo { inset-inline: 0; }
  h1 { font-size: 45px; }
  .hero-actions .button { width: 100%; }
  .phone { width: 330px; transform: none; }
  .phone-screen { min-height: 500px; padding-inline: 16px; }
  .section { padding: 72px 0; }
  .principle { padding: 30px 24px; border-radius: 25px; }
  .footer-grid { flex-direction: column; }
  .legal-main { padding: 26px 0 64px; }
  .help-main { padding: 26px 0 64px; }
  .help-hero { margin-bottom: 20px; }
  .help-hero .eyebrow { margin-bottom: 12px; }
  .help-hero h1 { font-size: 38px; line-height: 1.08; }
  .help-hero > p:not(.eyebrow) { margin-top: 14px; font-size: 15px; line-height: 1.65; }
  .help-callout { margin-top: 20px; padding: 15px; }
  .help-layout { gap: 16px; }
  .help-nav { padding: 10px; }
  .help-content { gap: 16px; }
  .platform-card { padding: 24px 20px; border-radius: 22px; }
  .platform-heading { margin-bottom: 22px; }
  .help-contact { padding: 18px 2px 0; align-items: flex-start; }
  .help-feedback-link { padding-top: 2px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}