:root {
  --canvas: #F3F5F2;
  --paper: #F7F4EC;
  --ink: #132019;
  --muted: #3A4A40;
  --forest: #176B3A;
  --line: #CFD9D1;
  --stage: #121614;
  --stage-ink: #F2F6F3;
  --cedar: #6B3E2A;
  --surface: #FFFFFF;
  --selection: #D5E8DC;
  --selection-ink: #12351F;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Songti SC", "Songti TC", "PMingLiU", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", sans-serif;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #121614;
    --paper: #1C2420;
    --ink: #F2F6F3;
    --muted: #C9D5CC;
    --forest: #4CC47F;
    --line: #35443A;
    --stage: #0E1210;
    --stage-ink: #F2F6F3;
    --cedar: #E4C4B0;
    --surface: #1C2420;
    --selection: #173528;
    --selection-ink: #E7F6EC;
  }
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: auto; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.1875rem;
  line-height: 1.65;
}

::selection {
  background: var(--selection);
  color: var(--selection-ink);
}

:focus { outline: none; }

:focus-visible {
  outline: 3px solid var(--forest);
  outline-offset: 3px;
}

img { max-width: 100%; height: auto; }

a {
  color: var(--forest);
  text-underline-offset: 0.18em;
}

.skip {
  position: absolute;
  left: 1rem;
  top: 0;
  transform: translateY(-120%);
  background: var(--forest);
  color: #F3FFF7;
  padding: 0.7rem 1rem;
  z-index: 5;
  text-decoration: none;
  font-family: var(--sans);
}

.skip:focus { transform: none; }

.wrap {
  width: min(72rem, calc(100% - 2.5rem));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: min(72rem, calc(100% - 2.5rem));
  margin: 0 auto;
  min-height: 4.25rem;
  font-family: var(--sans);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 44px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.brand img { width: 32px; height: 32px; }

.menu-button {
  margin-left: auto;
  min-height: 44px;
  min-width: 44px;
  padding: 0 0.9rem;
  font: inherit;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 2px;
}

.nav-panel {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

.nav-panel ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-panel a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.75rem;
  color: var(--ink);
  text-decoration: none;
}

.nav-panel a:hover,
.nav-panel a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-thickness: 2px;
}

.nav-panel a[aria-current="page"] { font-weight: 650; }

main { padding-bottom: 4rem; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.15fr);
  gap: 2.5rem;
  align-items: end;
  padding: 1.5rem 0 2.5rem;
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(3rem, 7vw, 5.25rem);
  font-weight: 600;
  line-height: 0.98;
  letter-spacing: -0.03em;
}

html[lang^="zh"] h1,
html[lang^="zh"] h2 { letter-spacing: 0; line-height: 1.2; }

.lead {
  margin: 0 0 1.25rem;
  max-width: 38rem;
  font-size: 1.35rem;
  line-height: 1.45;
}

.seal {
  margin: 0;
  padding: 0.15rem 0 0.15rem 0.9rem;
  border-left: 4px solid var(--forest);
  color: var(--cedar);
  font-size: clamp(1.45rem, 2vw, 1.8rem);
  font-weight: 600;
  line-height: 1.25;
}

.seal-note,
.muted { color: var(--muted); }

.seal-note { margin: 0.75rem 0 0; max-width: 38rem; font-family: var(--sans); font-size: 1rem; }

.text-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 0.75rem;
  font-family: var(--sans);
}

.stage {
  margin: 0;
  background: var(--stage);
  color: var(--stage-ink);
  padding: 0.7rem 0.7rem 0.9rem;
  border-top: 6px solid var(--cedar);
}

.stage img {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
}

.stage figcaption {
  margin: 0.85rem 0.25rem 0.15rem;
  font-family: var(--sans);
  font-size: 0.98rem;
  line-height: 1.45;
}

.intro { max-width: 40rem; padding-bottom: 0.5rem; }

.feature {
  display: grid;
  grid-template-columns: minmax(12rem, 16rem) minmax(0, 42rem);
  gap: 1.5rem 2rem;
  padding: 1.7rem 0;
  border-top: 1px solid var(--line);
}

.feature h2 {
  margin: 0;
  font-size: 1.7rem;
  font-weight: 600;
  line-height: 1.15;
}

.feature p,
.prose p,
.limits p { margin: 0; }

.limits {
  margin-top: 0.5rem;
  padding: 1.6rem 1.4rem;
  background: var(--paper);
}

.limits h2 { margin: 0 0 0.7rem; font-size: 1.7rem; }

.page-head { padding: 1.2rem 0 0.4rem; max-width: 42rem; }

.page-head h1 { font-size: clamp(2.4rem, 5vw, 3.6rem); }

.topics { font-family: var(--sans); padding: 0; margin: 1rem 0 1.5rem; }

.topics li { margin: 0.15rem 0; }

.topics a { display: inline-flex; align-items: center; min-height: 44px; }

.search {
  display: block;
  width: min(100%, 28rem);
  min-height: 44px;
  margin: 0.4rem 0 0.3rem;
  padding: 0.65rem 0.75rem;
  font: 1rem var(--sans);
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 2px;
}

.article {
  padding: 1.4rem 0;
  border-top: 1px solid var(--line);
  max-width: 42rem;
}

.article h2 { margin: 0 0 0.35rem; font-size: 1.85rem; }

.summary { color: var(--muted); }

.support-block { max-width: 42rem; padding: 1.2rem 0; border-top: 1px solid var(--line); }

.support-block h2,
.website-policy h2,
.app-policy h2 { margin: 0 0 0.6rem; font-size: 1.7rem; }

.website-policy,
.app-policy { max-width: 42rem; }

.website-policy { background: var(--paper); padding: 1.3rem 1.3rem 0.4rem; margin: 1rem 0 2rem; }

.policy-summary { color: var(--muted); }

footer {
  border-top: 1px solid var(--line);
  padding: 1.4rem 0 2.4rem;
  font-family: var(--sans);
  font-size: 1rem;
}

.footer-nav { display: flex; flex-wrap: wrap; gap: 0.2rem 1rem; margin-bottom: 0.6rem; }

.footer-nav a { display: inline-flex; align-items: center; min-height: 44px; color: var(--ink); }

.not-found-lang { max-width: 40rem; padding-top: 0.6rem; }

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; }
  .feature { grid-template-columns: 1fr; gap: 0.45rem; }
}

@media (max-width: 760px) {
  .menu-button { display: inline-flex; align-items: center; justify-content: center; }
  .nav-panel {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 4.25rem;
    margin: 0;
    padding: 0.4rem 1.25rem 1rem;
    background: var(--canvas);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    z-index: 4;
  }
  .nav-panel.is-open { display: flex; }
  .nav-panel ul { flex-direction: column; }
  .site-header { position: relative; }
}

@media (min-width: 761px) {
  .menu-button { display: none; }
}

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

@media print {
  .skip, .menu-button, .nav-panel { display: none !important; }
  body { background: #fff; color: #000; }
  a { color: #000; }
}

/* Product imagery leads the launch page. */
.hero{grid-template-columns:1fr;text-align:center;padding-top:4rem;gap:2rem}.hero .lead{max-width:48rem;margin-inline:auto}.hero .stage{width:min(100%,64rem);margin:0 auto;background:transparent;border:0;padding:0}.hero h1{font-weight:740;letter-spacing:-.05em}.hero .stage img{border-radius:16px;box-shadow:0 22px 65px #102b1b25}.seal-note{display:none}

.hero{padding-top:2.5rem;gap:1rem}.hero .seal{border:0;padding-left:0;font-family:var(--sans)}.hero .stage{width:min(100%,68rem)}