:root {
  color-scheme: light;
  --paper: #f3f0e8;
  --paper-raised: #faf8f3;
  --ink: #111318;
  --ink-soft: #50545b;
  --muted: #73767c;
  --line: #d9d4c9;
  --line-soft: #e6e1d7;
  --velocity: #167a9f;
  --velocity-deep: #0f607f;
  --force: #5e7818;
  --force-soft: #e8edd8;
  --mark-green: #42bc6c;
  --mark-blue: #3e8de0;
  --mark-red: #ed463f;
  --mark-yellow: #f0b731;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --shadow-raised: 0 12px 34px rgb(17 19 24 / 9%);
  font-family:
    "Avenir Next", Avenir, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

body[lang="zh-CN"] {
  line-height: 1.78;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  transform: translateY(-160%);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: var(--paper-raised);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1180px, calc(100% - 64px));
  min-height: 78px;
  margin: 0 auto;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}

.brand-word {
  font-size: 22px;
  font-weight: 750;
  letter-spacing: -0.012em;
}

.power-mark {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 34px;
}

.power-mark span {
  display: block;
  width: 6px;
  border-radius: 99px;
}

.power-mark span:nth-child(1) {
  height: 18px;
  background: var(--mark-green);
}

.power-mark span:nth-child(2) {
  height: 28px;
  background: var(--mark-blue);
}

.power-mark span:nth-child(3) {
  height: 34px;
  background: var(--mark-red);
}

.power-mark span:nth-child(4) {
  height: 26px;
  background: var(--mark-yellow);
}

.power-mark span:nth-child(5) {
  height: 17px;
  background: var(--mark-blue);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition-property: color, transform;
  transition-duration: 160ms;
  transition-timing-function: ease-out;
}

.nav-link[aria-current="page"] {
  color: var(--velocity-deep);
}

.nav-link:active {
  transform: scale(0.97);
}

.nav-link:focus-visible,
.button:focus-visible,
.document a:focus-visible,
details summary:focus-visible {
  outline: 2px solid var(--velocity);
  outline-offset: 3px;
}

.legal-shell {
  display: grid;
  grid-template-columns: minmax(280px, 0.78fr) minmax(0, 1.22fr);
  width: min(1180px, calc(100% - 64px));
  margin: 0 auto;
  gap: clamp(56px, 8vw, 118px);
  padding: clamp(64px, 8vw, 112px) 0 112px;
}

.page-intro {
  align-self: start;
  position: sticky;
  top: 32px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: var(--force);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 26px;
  height: 3px;
  border-radius: 99px;
  background: currentColor;
  content: "";
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 9ch;
  margin-bottom: 24px;
  font-size: clamp(46px, 6.5vw, 76px);
  font-weight: 750;
  letter-spacing: -0.035em;
  line-height: 0.98;
  text-wrap: balance;
}

body[lang="zh-CN"] h1 {
  max-width: 7.5em;
  font-size: clamp(46px, 5vw, 62px);
  letter-spacing: 0;
  line-height: 1.03;
}

.lede {
  max-width: 36rem;
  margin-bottom: 30px;
  color: var(--ink-soft);
  font-size: 17px;
  text-wrap: pretty;
}

.trust-list {
  display: grid;
  margin: 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  gap: 12px;
  list-style: none;
}

.trust-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 600;
}

.trust-dot {
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--force);
}

.document {
  min-width: 0;
}

.document-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  background: var(--paper-raised);
  box-shadow: var(--shadow-raised);
  color: var(--muted);
  font-size: 13px;
  gap: 16px;
}

.document-meta strong {
  color: var(--ink);
}

.document section {
  padding: 0 0 34px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 34px;
  scroll-margin-top: 24px;
}

.document section:last-of-type {
  margin-bottom: 0;
}

.section-index {
  display: block;
  margin-bottom: 9px;
  color: var(--velocity);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  font-weight: 750;
  letter-spacing: 0.1em;
}

.document h2 {
  margin-bottom: 12px;
  font-size: clamp(23px, 3vw, 30px);
  font-weight: 700;
  letter-spacing: -0.012em;
  line-height: 1.2;
  text-wrap: balance;
}

body[lang="zh-CN"] .document h2 {
  letter-spacing: 0;
}

.document h3 {
  margin: 22px 0 8px;
  font-size: 17px;
  line-height: 1.35;
}

.document p,
.document li {
  max-width: 68ch;
  color: var(--ink-soft);
  font-size: 16px;
  text-wrap: pretty;
}

.document p:last-child {
  margin-bottom: 0;
}

.document ul,
.document ol {
  display: grid;
  margin: 14px 0 0;
  padding-left: 1.25em;
  gap: 9px;
}

.document a {
  color: var(--velocity-deep);
  font-weight: 650;
  text-underline-offset: 3px;
}

.document a.button {
  color: white;
  text-decoration: none;
}

.document a.button.secondary {
  color: var(--ink);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 0;
  border-radius: var(--radius-md);
  background: var(--velocity);
  color: white;
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  touch-action: manipulation;
  transition-property: background-color, transform;
  transition-duration: 160ms;
  transition-timing-function: ease-out;
}

.button:active {
  transform: scale(0.97);
}

.button.secondary {
  border: 1px solid var(--line);
  background: var(--paper-raised);
  color: var(--ink);
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.faq-list {
  display: grid;
  gap: 10px;
}

details {
  border-radius: var(--radius-md);
  background: var(--paper-raised);
}

details summary {
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 700;
  list-style: none;
  touch-action: manipulation;
}

details summary::-webkit-details-marker {
  display: none;
}

details summary::after {
  color: var(--velocity);
  content: "+";
  font-size: 22px;
  font-weight: 500;
}

details[open] summary::after {
  content: "−";
}

.faq-answer {
  padding: 0 18px 18px;
  color: var(--ink-soft);
  font-size: 15px;
}

.contact-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  padding: 28px;
  border-radius: var(--radius-lg);
  background: var(--ink);
  color: var(--paper-raised);
  gap: 24px;
}

.contact-band h2 {
  margin-bottom: 6px;
  color: var(--paper-raised);
}

.contact-band p {
  margin: 0;
  color: rgb(250 248 243 / 68%);
}

.site-footer {
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1180px, calc(100% - 64px));
  min-height: 96px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 13px;
  gap: 24px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-links a {
  color: var(--ink-soft);
  text-underline-offset: 3px;
}

@media (hover: hover) {
  .nav-link:hover,
  .document a:hover,
  .footer-links a:hover {
    color: var(--velocity);
  }

  .button:hover {
    background: var(--velocity-deep);
  }

  .button.secondary:hover {
    background: white;
    color: var(--ink);
  }
}

@media (max-width: 800px) {
  .legal-shell {
    grid-template-columns: 1fr;
    gap: 56px;
  }

  .page-intro {
    position: static;
  }

  h1 {
    max-width: 10ch;
  }

  .contact-band {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .nav,
  .legal-shell,
  .footer-inner {
    width: min(100% - 40px, 1180px);
  }

  .nav {
    min-height: 70px;
  }

  .nav-actions .company-link {
    display: none;
  }

  .nav-link {
    padding: 0 8px;
  }

  .legal-shell {
    padding: 52px 0 80px;
  }

  h1 {
    font-size: clamp(42px, 15vw, 58px);
  }

  .document-meta {
    align-items: flex-start;
    flex-direction: column;
  }

  .contact-band {
    padding: 22px;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding: 24px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .nav-link,
  .button {
    transition: none;
  }
}

@media print {
  .site-header,
  .site-footer,
  .action-row,
  .contact-band {
    display: none;
  }

  .legal-shell {
    display: block;
    width: auto;
    padding: 0;
  }

  .page-intro {
    position: static;
    margin-bottom: 40px;
  }

  .document-meta {
    padding: 0;
    box-shadow: none;
  }
}