:root {
  --navy-950: #081326;
  --navy-900: #0b1730;
  --ink: #101c31;
  --ink-soft: #4d5d75;
  --paper: #f7f8f5;
  --white: #fff;
  --line: #dfe4eb;
  --periwinkle: #7785ff;
  --mint: #69d3b1;
  --mint-soft: #dcf6ed;
  --shadow: 0 24px 70px rgba(7, 20, 42, .1);
  --radius-lg: 28px;
  --radius-md: 20px;
  --content: 1200px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  background: var(--paper);
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--white);
  color: var(--navy-950);
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--mint); outline-offset: 3px; }

.hero-shell {
  position: relative;
  overflow: hidden;
  color: var(--white);
  background:
    radial-gradient(circle at 72% 28%, rgba(90, 107, 228, .23), transparent 26%),
    radial-gradient(circle at 92% 84%, rgba(31, 121, 161, .25), transparent 25%),
    linear-gradient(135deg, var(--navy-950), var(--navy-900) 56%, #10294f);
}

.hero-shell::after {
  content: "";
  position: absolute;
  right: -14vw;
  bottom: -42vw;
  width: 62vw;
  height: 62vw;
  min-width: 620px;
  min-height: 620px;
  border: 1px solid rgba(119, 133, 255, .25);
  border-radius: 50%;
  box-shadow: 0 0 100px rgba(79, 111, 255, .12) inset;
}

.site-header, .hero, .section, .company-section, .footer-main, .footer-bottom, .support-main {
  width: min(calc(100% - 48px), var(--content));
  margin-inline: auto;
}

.site-header {
  position: relative;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 88px;
  border-bottom: 1px solid rgba(255, 255, 255, .13);
}

.brand { display: inline-flex; align-items: center; gap: 12px; width: fit-content; }
.brand-mark {
  color: var(--white);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 31px;
  font-weight: 800;
  letter-spacing: -.12em;
  line-height: 1;
}
.brand-copy { display: grid; line-height: 1.25; }
.brand-copy strong { font-size: 14px; letter-spacing: .02em; }
.brand-copy small { color: rgba(255, 255, 255, .66); font-size: 10px; letter-spacing: .04em; }

.desktop-nav, .footer-nav { display: flex; align-items: center; gap: 36px; }
.desktop-nav a { position: relative; color: rgba(255, 255, 255, .78); font-size: 14px; }
.desktop-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -8px;
  left: 0;
  height: 1px;
  background: var(--mint);
  transform: scaleX(0);
  transition: transform 180ms ease;
}
.desktop-nav a:hover { color: var(--white); }
.desktop-nav a:hover::after { transform: scaleX(1); }

.language-switch {
  justify-self: end;
  display: flex;
  gap: 3px;
  padding: 3px;
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 12px;
  background: rgba(255, 255, 255, .04);
}
.language-switch button {
  min-width: 50px;
  min-height: 34px;
  padding: 5px 12px;
  border: 0;
  border-radius: 9px;
  color: rgba(255, 255, 255, .72);
  background: transparent;
  cursor: pointer;
}
.language-switch button[aria-pressed="true"] {
  color: var(--white);
  background: rgba(119, 133, 255, .7);
  box-shadow: 0 4px 18px rgba(31, 45, 139, .35);
}

.hero {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, .93fr) minmax(440px, 1.07fr);
  align-items: center;
  gap: 56px;
  min-height: 590px;
  padding-block: 72px 96px;
}
.hero-copy { max-width: 650px; }
.eyebrow, .section-kicker {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 22px;
  color: #aeb9d0;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .2em;
}
.eyebrow::before, .section-kicker::before { content: ""; width: 34px; height: 1px; background: currentColor; }
.hero h1 {
  margin: 0;
  max-width: 680px;
  font-size: clamp(48px, 5.5vw, 78px);
  font-weight: 690;
  letter-spacing: -.055em;
  line-height: .99;
}
.hero-lead {
  max-width: 600px;
  margin: 28px 0 0;
  color: rgba(255, 255, 255, .72);
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.55;
}
.primary-action {
  display: inline-flex;
  align-items: center;
  gap: 20px;
  min-height: 52px;
  margin-top: 36px;
  padding: 13px 21px;
  border-radius: 12px;
  background: var(--periwinkle);
  color: var(--white);
  font-weight: 650;
  box-shadow: 0 16px 38px rgba(64, 80, 222, .32);
  transition: transform 180ms ease, background 180ms ease;
}
.primary-action:hover { background: #8692ff; transform: translateY(-2px); }

.hero-art { position: relative; height: 430px; }
.orbit {
  position: absolute;
  top: 48%;
  left: 50%;
  border: 1px solid rgba(143, 158, 255, .6);
  border-radius: 50%;
  transform: translate(-50%, -50%) rotate(-11deg);
}
.orbit-one { width: 103%; height: 44%; }
.orbit-two { width: 80%; height: 30%; border-color: rgba(105, 211, 177, .48); transform: translate(-50%, -50%) rotate(12deg); }
.orbit-dot {
  position: absolute;
  width: 9px;
  height: 9px;
  border: 2px solid rgba(255, 255, 255, .48);
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 18px var(--mint);
}
.dot-one { top: 32%; left: 7%; }
.dot-two { top: 21%; right: 18%; background: #8fa2ff; }
.dot-three { right: 7%; bottom: 28%; }
.idea-card {
  position: absolute;
  display: grid;
  place-items: center;
  width: 152px;
  height: 188px;
  border: 1px solid rgba(255, 255, 255, .4);
  border-radius: 18px;
  box-shadow: 0 32px 70px rgba(2, 9, 23, .36);
  backdrop-filter: blur(8px);
}
.card-learn {
  top: 74px;
  left: 18%;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 24px;
  color: var(--navy-900);
  background: rgba(246, 248, 255, .94);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 24px;
  line-height: 1.3;
  transform: rotate(-5deg);
}
.card-sprout { top: 44px; left: 47%; z-index: 2; background: linear-gradient(145deg, rgba(105, 211, 177, .96), rgba(62, 153, 138, .9)); transform: rotate(3deg); }
.card-note { right: 8%; bottom: 55px; z-index: 4; align-content: center; gap: 12px; height: 158px; background: rgba(227, 235, 255, .93); transform: rotate(7deg); }
.card-note span { width: 64%; height: 7px; border-radius: 8px; background: #91a8da; }
.card-note span:last-child { width: 42%; }
.sprout { position: relative; width: 3px; height: 72px; border-radius: 5px; background: var(--white); }
.sprout::before, .sprout::after {
  content: "";
  position: absolute;
  top: 14px;
  width: 34px;
  height: 50px;
  border: 3px solid var(--white);
  border-radius: 100% 0 100% 0;
}
.sprout::before { right: 0; transform: rotate(-21deg); }
.sprout::after { left: 0; transform: scaleX(-1) rotate(-21deg); }
.art-note { position: absolute; right: 0; top: 10px; margin: 0; color: rgba(255, 255, 255, .45); font-size: 13px; line-height: 1.55; }

.section { padding-block: 104px; }
.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; margin-bottom: 40px; }
.section-heading.compact { align-items: center; }
.section-kicker { margin-bottom: 10px; color: #54657c; }
.section-kicker.light { color: #aeb9d0; }
.section-heading h2, .company-section h2, .support-hero h1 { margin: 0; font-size: clamp(34px, 4vw, 54px); letter-spacing: -.045em; line-height: 1.05; }
.catalog-label {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, .62);
  font-size: 13px;
}
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 4px var(--mint-soft); }
.product-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.product-card {
  position: relative;
  overflow: hidden;
  min-height: 456px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, .85);
  box-shadow: 0 10px 38px rgba(17, 34, 61, .055);
  transition: transform 220ms ease, box-shadow 220ms ease, border-color 220ms ease;
}
.product-card::after { content: ""; position: absolute; right: -100px; bottom: -130px; width: 270px; height: 270px; border-radius: 50%; background: var(--card-accent, #e9ebff); opacity: .64; }
.product-card:hover { transform: translateY(-4px); border-color: #cbd3df; box-shadow: var(--shadow); }
.product-head { position: relative; z-index: 1; display: grid; grid-template-columns: 104px 1fr; gap: 24px; align-items: center; }
.product-icon { display: block; width: 104px; height: 104px; border-radius: 24px; object-fit: cover; box-shadow: 0 16px 34px rgba(17, 27, 50, .16); }
.product-name { margin: 0; font-size: clamp(30px, 3vw, 42px); letter-spacing: -.045em; line-height: 1.06; }
.product-tagline { margin: 8px 0 0; color: var(--ink-soft); font-size: 15px; font-weight: 650; }
.product-description { position: relative; z-index: 1; min-height: 76px; margin: 28px 0 0; color: var(--ink-soft); font-size: 16px; }
.feature-list { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 9px; margin: 24px 0 0; padding: 0; list-style: none; }
.feature-list li { padding: 7px 10px; border: 1px solid var(--line); border-radius: 9px; color: #43536a; background: rgba(247, 248, 245, .88); font-size: 12px; font-weight: 650; }
.product-actions { position: relative; z-index: 1; display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 30px; }
.store-link, .privacy-link { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; border-radius: 10px; font-size: 13px; font-weight: 700; transition: transform 160ms ease, background 160ms ease; }
.store-link { gap: 8px; padding: 10px 14px; color: var(--white); background: var(--navy-950); }
.store-link::after, .privacy-link::after { content: "↗"; font-size: 12px; }
.store-link:hover, .privacy-link:hover { transform: translateY(-2px); }
.store-link:hover { background: #182b4d; }
.privacy-link { padding: 9px 7px; color: #4c5ed8; }
.noscript-message { padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--white); }

.principles-section { border-top: 1px solid var(--line); }
.section-intro { max-width: 480px; margin: 0; color: var(--ink-soft); }
.principles-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.principle { min-height: 230px; padding: 34px 30px 34px 0; }
.principle + .principle { padding-left: 30px; border-left: 1px solid var(--line); }
.principle-number { color: #7f8ca0; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; }
.principle h3 { margin: 42px 0 10px; font-size: 21px; letter-spacing: -.025em; }
.principle p { margin: 0; color: var(--ink-soft); }

.company-section {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(320px, .7fr);
  gap: 64px;
  margin-bottom: 96px;
  padding: 64px;
  border-radius: var(--radius-lg);
  color: var(--white);
  background: linear-gradient(135deg, #15274a, var(--navy-950));
  box-shadow: 0 24px 80px rgba(7, 20, 42, .14);
}
.company-copy > p:last-child { max-width: 680px; margin: 24px 0 0; color: rgba(255, 255, 255, .68); font-size: 17px; }
.contact-card { display: grid; align-content: center; gap: 8px; padding-left: 38px; border-left: 1px solid rgba(255, 255, 255, .16); }
.contact-label { margin: 0 0 10px; color: #aeb9d0; font-size: 12px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.contact-card a { width: fit-content; font-size: 17px; font-weight: 650; }
.contact-card a:hover { color: var(--mint); }
.contact-card > p:last-child { max-width: 380px; margin: 14px 0 0; color: rgba(255, 255, 255, .58); font-size: 13px; }

.site-footer { padding: 52px 0 26px; color: rgba(255, 255, 255, .76); background: var(--navy-950); }
.footer-main { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 40px; }
.footer-nav a { font-size: 13px; }
.footer-nav a:hover, .footer-legal a:hover { color: var(--mint); }
.footer-legal { justify-self: end; display: grid; gap: 5px; text-align: right; font-size: 12px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; margin-top: 38px; padding-top: 22px; border-top: 1px solid rgba(255, 255, 255, .13); color: rgba(255, 255, 255, .42); font-size: 11px; }
.footer-bottom p { margin: 0; }

.subpage-shell { min-height: 390px; }
.support-hero { display: grid; align-items: end; width: min(calc(100% - 48px), var(--content)); min-height: 290px; margin-inline: auto; padding-block: 64px 70px; }
.support-hero p { max-width: 670px; margin: 20px 0 0; color: rgba(255, 255, 255, .68); font-size: 18px; }
.support-main { display: grid; grid-template-columns: minmax(240px, .55fr) minmax(0, 1.45fr); gap: 70px; padding-block: 88px 108px; }
.support-contact { position: sticky; top: 40px; align-self: start; padding: 28px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); }
.support-contact h2, .faq h2 { margin: 0 0 18px; font-size: 28px; letter-spacing: -.035em; }
.support-contact p { margin: 0 0 20px; color: var(--ink-soft); }
.support-email { color: #4c5ed8; font-weight: 700; word-break: break-word; }
.faq-item { padding: 0 0 28px; border-bottom: 1px solid var(--line); }
.faq-item + .faq-item { padding-top: 28px; }
.faq-item h3 { margin: 0 0 10px; font-size: 19px; }
.faq-item p { margin: 0; color: var(--ink-soft); }

@media (max-width: 980px) {
  .site-header { grid-template-columns: 1fr auto; }
  .desktop-nav { display: none; }
  .hero { grid-template-columns: 1fr; gap: 30px; padding-top: 62px; }
  .hero-copy { max-width: 760px; }
  .hero-art { width: min(100%, 650px); height: 360px; margin-inline: auto; }
  .product-grid { grid-template-columns: 1fr; }
  .product-card { min-height: 410px; }
  .product-description { min-height: auto; }
  .company-section { padding: 48px; }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .footer-nav { display: none; }
}

@media (max-width: 720px) {
  .site-header, .hero, .section, .company-section, .footer-main, .footer-bottom, .support-main, .support-hero { width: min(calc(100% - 32px), var(--content)); }
  .site-header { min-height: 74px; }
  .brand-copy { display: none; }
  .brand-mark { font-size: 29px; }
  .language-switch button { min-width: 46px; min-height: 36px; padding-inline: 9px; }
  .hero { min-height: auto; padding-block: 58px 64px; }
  .hero h1 { font-size: clamp(42px, 13vw, 60px); line-height: 1.02; }
  html[lang="zh-CN"] .hero h1 { font-size: clamp(40px, 11vw, 54px); line-height: 1.12; }
  .hero-lead { margin-top: 22px; font-size: 16px; }
  .primary-action { width: 100%; justify-content: space-between; margin-top: 28px; }
  .hero-art { height: 290px; margin-top: 8px; }
  .idea-card { width: 105px; height: 138px; border-radius: 14px; }
  .card-learn { top: 68px; left: 12%; padding: 16px; font-size: 17px; }
  .card-sprout { top: 38px; left: 43%; }
  .card-note { right: 5%; bottom: 34px; height: 112px; }
  .sprout { height: 51px; }
  .sprout::before, .sprout::after { width: 24px; height: 35px; }
  .art-note { display: none; }
  .section { padding-block: 72px; }
  .section-heading, .section-heading.compact { align-items: flex-start; flex-direction: column; gap: 20px; margin-bottom: 28px; }
  .section-heading h2, .company-section h2, .support-hero h1 { font-size: 36px; }
  .product-card { min-height: 0; padding: 22px; border-radius: 22px; }
  .product-head { grid-template-columns: 76px 1fr; gap: 16px; }
  .product-icon { width: 76px; height: 76px; border-radius: 18px; }
  .product-name { font-size: 30px; }
  .product-description { margin-top: 22px; }
  .product-actions { align-items: stretch; }
  .store-link { flex: 1 1 calc(50% - 5px); min-width: 138px; }
  .privacy-link { flex-basis: 100%; justify-content: flex-start; }
  .principles-grid { grid-template-columns: 1fr; }
  .principle { min-height: 0; padding: 28px 0; }
  .principle + .principle { padding-left: 0; border-top: 1px solid var(--line); border-left: 0; }
  .principle h3 { margin-top: 24px; }
  .company-section { grid-template-columns: 1fr; gap: 38px; margin-bottom: 72px; padding: 34px 24px; border-radius: 22px; }
  .contact-card { padding: 30px 0 0; border-top: 1px solid rgba(255, 255, 255, .16); border-left: 0; }
  .site-footer { padding-top: 40px; }
  .footer-main { grid-template-columns: 1fr; }
  .footer-brand .brand-copy { display: grid; }
  .footer-legal { justify-self: start; text-align: left; }
  .footer-bottom { flex-direction: column; gap: 8px; }
  .subpage-shell { min-height: 350px; }
  .support-hero { min-height: 275px; }
  .support-main { grid-template-columns: 1fr; gap: 54px; padding-block: 64px 80px; }
  .support-contact { position: static; }
}

@media (max-width: 380px) {
  .store-link { flex-basis: 100%; }
  .product-name { font-size: 27px; }
  .product-tagline { font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}

@media (prefers-color-scheme: dark) { :root { color-scheme: light; } }