:root {
  --bg: #faf9f7;
  --fg: #101114;
  --muted: #72747d;
  --line: #e8e9ee;
  --panel: #f3f4f8;
  --accent: #5a4cff;
  --max: 1240px;
}

* { box-sizing: border-box; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.5;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--fg); outline-offset: 4px; }
.wrap { width: min(var(--max), calc(100% - 48px)); margin-inline: auto; }
.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 20;
  transform: translateY(-160%);
  background: var(--fg);
  color: var(--bg);
  padding: 10px 14px;
}
.skip-link:focus { transform: none; }

.site-header {
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 760;
  letter-spacing: .16em;
}
.brand img { width: 48px; height: 32px; object-fit: contain; }
.site-nav { display: flex; gap: clamp(16px, 2.6vw, 30px); }
.site-nav a, .site-footer a { text-decoration: none; font-size: 14px; }
.site-nav a:hover, .site-footer a:hover, .text-link:hover { text-decoration: underline; }
.site-nav .nav-play {
  margin-block: -8px;
  border-radius: 999px;
  background: var(--fg);
  color: var(--bg);
  padding: 8px 15px;
  text-decoration: none;
}

.hero {
  min-height: calc(100svh - 80px);
  padding-block: clamp(110px, 16vh, 180px) clamp(90px, 13vh, 150px);
  display: flex;
  align-items: center;
}
.hero-copy { width: 100%; position: relative; z-index: 1; }
.eyebrow {
  margin: 0 0 26px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  max-width: none;
  margin-bottom: 0;
  font-size: clamp(66px, 8.3vw, 128px);
  font-weight: 460;
  letter-spacing: -.068em;
  line-height: .88;
}
h1 span { display: block; }
h1 span:last-child { margin-left: clamp(0px, 7vw, 108px); color: #3f51e8; }
h2 {
  margin-bottom: 30px;
  font-size: clamp(40px, 6vw, 76px);
  font-weight: 520;
  letter-spacing: -.045em;
  line-height: 1;
}
h3 { font-size: 23px; font-weight: 560; line-height: 1.2; }
.hero-lower {
  margin-top: clamp(64px, 9vh, 104px);
  border-top: 1px solid #d9d8d3;
  padding-top: 30px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 48px;
  align-items: end;
}
.hero-cn {
  margin-bottom: 0;
  font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
  font-size: clamp(27px, 3vw, 44px);
  font-weight: 500;
  letter-spacing: .015em;
  line-height: 1.45;
}
.lede, .section-copy > p {
  max-width: 700px;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.55;
}
.actions { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 0; }
.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--fg);
  border-radius: 999px;
  padding: 12px 22px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 620;
  transition: background-color .2s ease, color .2s ease, transform .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { border-color: var(--accent); background: var(--accent); color: white; }
.button-primary:hover { background: #4738e8; }
.button-quiet { border-color: transparent; padding-inline: 10px; }
.button-quiet:hover { color: var(--accent); }

.section { padding-block: clamp(88px, 12vw, 150px); border-top: 1px solid var(--line); }
.split { display: grid; grid-template-columns: 1.2fr .8fr; gap: clamp(48px, 8vw, 110px); align-items: end; }
.section-copy .support-cn { color: var(--fg); font-size: 18px; }
.evidence-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 56px;
}
.evidence-grid article {
  min-height: 240px;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 28px;
}
.evidence-grid p { color: var(--muted); }

.download-layout { display: grid; grid-template-columns: 1fr auto; gap: 80px; align-items: center; }
.release-meta { margin-top: 20px; color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; }
.download-qr { margin: 0; text-align: center; }
.download-qr img { background: white; border-radius: 16px; padding: 10px; }
.download-qr figcaption { max-width: 220px; margin-top: 12px; color: var(--muted); font-size: 12px; }

.evidence-grid article { min-height: 310px; display: flex; flex-direction: column; }
.evidence-grid .limitation { margin-top: auto; font-size: 14px; }
.maturity { display: inline-block; width: fit-content; margin-top: 12px; border-radius: 999px; padding: 7px 10px; font-size: 11px; font-weight: 700; }
.maturity.verified { background: #dcebc5; }
.maturity.human-reviewed { background: #d8e4f0; }
.text-link { display: inline-block; margin-top: 36px; font-weight: 650; text-underline-offset: 4px; }

.company { background: #fff; }
.company-wordmark { margin: 0; }
.seal-crop {
  position: relative;
  display: block;
  width: 390px;
  max-width: 100%;
  height: 118px;
  overflow: hidden;
}
.seal-crop img {
  position: absolute;
  width: 746px;
  max-width: none;
  height: 307px;
  left: -145px;
  top: -71px;
}
.site-footer { border-top: 1px solid var(--line); padding-block: 60px; }
.legal-page { padding-bottom: 64px; }
.legal-content { width: min(760px, calc(100% - 48px)); margin: 0 auto; padding: 24px 0 112px; border-bottom: 0; }
.legal-content h2 { margin: 44px 0 12px; font-size: clamp(21px, 2.2vw, 28px); }
.legal-content p { color: var(--muted); line-height: 1.8; }
.legal-content a { color: var(--fg); text-underline-offset: 3px; }
.release-integrity { margin-top: 16px; color: var(--muted); font-size: 12px; }
.release-integrity summary { cursor: pointer; color: var(--fg); font-weight: 650; }
.release-integrity p { line-height: 1.6; }
.release-integrity code { overflow-wrap: anywhere; font-size: 11px; }
.footer-grid { display: grid; grid-template-columns: .8fr 1.4fr auto; gap: 32px; align-items: start; }
.footer-grid > div { display: flex; flex-direction: column; gap: 8px; }
.footer-grid > div > span, .footer-grid p { color: var(--muted); font-size: 13px; }
.footer-grid nav { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-grid p { margin: 0; }

@media (max-width: 760px) {
  .wrap { width: min(var(--max), calc(100% - 28px)); }
  .site-header { min-height: 72px; }
  .site-header { gap: 12px; }
  .site-nav { gap: 10px; }
  .site-nav a { font-size: 11px; }
  .brand { gap: 7px; font-size: 12px; }
  .brand img { width: 39px; height: 26px; }
  .hero { min-height: calc(100svh - 72px); padding-block: 86px 96px; }
  h1 { font-size: clamp(52px, 14vw, 72px); line-height: .94; }
  h1 span:last-child { margin: 10px 0 0; }
  .hero-lower { margin-top: 64px; grid-template-columns: 1fr; align-items: start; }
  .hero-cn { font-size: clamp(25px, 8vw, 34px); }
  h1 { width: 100%; max-width: 100%; font-size: clamp(38px, 11vw, 44px); line-height: .98; overflow-wrap: normal; }
  .split, .download-layout, .footer-grid { grid-template-columns: 1fr; }
  .evidence-grid { grid-template-columns: 1fr; }
  .download-layout { gap: 40px; }
  .download-qr { display: none; }
  .section-copy { align-self: start; }
  .seal-crop { width: 330px; height: 104px; }
  .seal-crop img { width: 650px; height: auto; left: -126px; top: -61px; }
  .footer-grid nav { gap: 12px 18px; }
}

@media (max-width: 520px) {
  h1 { font-size: 38px; }
  .site-nav a:not(.nav-play) { display: none; }
  .site-nav { flex: 0 0 auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* Compatibility for retained secondary pages; Package 02 does not rewrite their content. */
.site-header:not(.wrap), main > section:not(.section):not(.hero), .site-footer > * {
  width: min(var(--max), calc(100% - 48px));
  margin-inline: auto;
}
.site-header:not(.wrap) { padding-block: 20px; }
main > section:not(.section):not(.hero) { padding-block: clamp(72px, 9vw, 110px); border-top: 1px solid var(--line); }
.section-head { max-width: 760px; }
.section-head p, .lede, .note { color: var(--muted); }
.btn {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  border: 1px solid var(--fg);
  border-radius: 999px;
  padding: 10px 18px;
  text-decoration: none;
}
.btn-brand, .btn-primary { background: var(--fg); color: var(--bg); }
.fact-grid, .products, .evidence-list, .contact-grid, .principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 36px;
}
.fact, .product-card, .evidence-item, .contact-card, .principle {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
}
table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid var(--line); padding: 12px; text-align: left; }
@media (max-width: 760px) {
  .site-header:not(.wrap), main > section:not(.section):not(.hero), .site-footer > * { width: min(var(--max), calc(100% - 28px)); }
}

/* Contact page */
.contact-hero {
  padding-block: clamp(84px, 11vw, 144px) clamp(64px, 8vw, 104px);
}
.contact-hero h1 {
  max-width: 900px;
  font-size: clamp(64px, 9vw, 124px);
  line-height: .9;
}
.contact-intro {
  max-width: 680px;
  margin: clamp(40px, 6vw, 72px) 0 0 auto;
  color: var(--muted);
  font-size: clamp(19px, 2vw, 25px);
  line-height: 1.6;
}
.contact-section {
  border-top: 1px solid var(--line);
  padding-block: clamp(72px, 9vw, 120px);
}
.contact-layout {
  display: grid;
  grid-template-columns: minmax(280px, .78fr) minmax(0, 1.22fr);
  gap: clamp(56px, 9vw, 132px);
  align-items: start;
}
.contact-details { display: grid; gap: 52px; }
.contact-kicker {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.contact-email {
  font-size: clamp(20px, 2.1vw, 28px);
  font-weight: 560;
  text-decoration-thickness: 1px;
  text-underline-offset: 6px;
}
.contact-email-only {
  min-height: clamp(260px, 30vw, 420px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.contact-email-only .contact-email {
  width: fit-content;
  font-size: clamp(32px, 5.4vw, 76px);
  font-weight: 480;
  letter-spacing: -.045em;
  line-height: 1.08;
  text-decoration-thickness: 2px;
  text-underline-offset: 12px;
}
.contact-topics ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.contact-topics li {
  border-bottom: 1px solid var(--line);
  padding-block: 11px;
  color: var(--muted);
}
.contact-privacy { max-width: 380px; color: var(--muted); font-size: 13px; }
.contact-privacy a { text-underline-offset: 3px; }
.contact-form { display: grid; gap: 26px; }
.contact-field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.contact-field { display: grid; gap: 10px; }
.contact-field label { font-size: 14px; font-weight: 650; }
.contact-field label span { margin-left: 6px; color: var(--muted); font-size: 12px; font-weight: 450; }
.contact-field input, .contact-field select, .contact-field textarea {
  width: 100%;
  border: 1px solid #d7d8de;
  border-radius: 12px;
  background: rgba(255, 255, 255, .72);
  color: var(--fg);
  padding: 14px 16px;
  font: inherit;
  transition: border-color .2s ease, box-shadow .2s ease, background-color .2s ease;
}
.contact-field input, .contact-field select { min-height: 52px; }
.contact-field textarea { min-height: 176px; resize: vertical; }
.contact-field input:focus, .contact-field select:focus, .contact-field textarea:focus {
  border-color: var(--accent);
  outline: 0;
  background: #fff;
  box-shadow: 0 0 0 4px rgba(90, 76, 255, .12);
}
.contact-submit-row { display: flex; align-items: center; gap: 20px; }
.contact-submit-row button { border: 0; cursor: pointer; }
.contact-submit-row output { max-width: 320px; color: var(--muted); font-size: 12px; }

@media (max-width: 760px) {
  .contact-hero { padding-block: 72px 64px; }
  .contact-hero h1 { font-size: clamp(56px, 18vw, 76px); }
  .contact-intro { margin-top: 38px; font-size: 18px; }
  .contact-layout { grid-template-columns: 1fr; gap: 64px; }
  .contact-details { gap: 36px; }
  .contact-field-row { grid-template-columns: 1fr; }
  .contact-submit-row { align-items: flex-start; flex-direction: column; }
  .contact-email-only { min-height: 240px; }
  .contact-email-only .contact-email {
    font-size: clamp(27px, 8vw, 42px);
    letter-spacing: -.035em;
    text-underline-offset: 8px;
  }
}