:root {
  color-scheme: light;
  --ink: #13213d;
  --ink-soft: #667289;
  --accent: #31b8a1;
  --accent-deep: #178d7a;
  --mint: #dff5f0;
  --mint-strong: #bcebe1;
  --canvas: #f7f6f2;
  --card: #ffffff;
  --line: #dfe3e8;
  --warning: #9a6500;
  --danger: #a43737;
  --shadow: 0 16px 40px rgba(19, 33, 61, 0.08);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --content: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--canvas);
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 0%, rgba(49, 184, 161, 0.13), transparent 28rem),
    radial-gradient(circle at 92% 16%, rgba(188, 235, 225, 0.48), transparent 24rem),
    var(--canvas);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-deep);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--ink);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(49, 184, 161, 0.45);
  outline-offset: 3px;
}

img {
  max-width: 100%;
}

.site-shell {
  width: min(calc(100% - 40px), var(--content));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(19, 33, 61, 0.08);
  background: rgba(247, 246, 242, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.header-row {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
  letter-spacing: -0.025em;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 11px;
  box-shadow: 0 7px 18px rgba(19, 33, 61, 0.15);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-links a {
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
}

.nav-links a[aria-current="page"],
.nav-links a:hover {
  color: var(--ink);
}

.language-switch {
  display: inline-flex;
  align-items: center;
  padding: 4px;
  border: 1px solid rgba(19, 33, 61, 0.12);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
}

.language-switch button {
  min-width: 48px;
  min-height: 36px;
  padding: 0 12px;
  border: 0;
  border-radius: 999px;
  color: var(--ink-soft);
  background: transparent;
  font: inherit;
  font-size: 0.84rem;
  font-weight: 750;
  cursor: pointer;
}

.language-switch button[aria-pressed="true"] {
  color: var(--ink);
  background: var(--card);
  box-shadow: 0 2px 10px rgba(19, 33, 61, 0.1);
}

main {
  padding: 72px 0 88px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.62fr);
  align-items: center;
  gap: 64px;
  min-height: 520px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent-deep);
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.16;
  letter-spacing: -0.035em;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(3.1rem, 7vw, 5.8rem);
}

.document-hero h1 {
  max-width: 900px;
  font-size: clamp(2.5rem, 5vw, 4.8rem);
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(1.65rem, 3vw, 2.35rem);
}

h3 {
  margin-bottom: 10px;
  font-size: 1.16rem;
}

p {
  margin: 0 0 1em;
}

.lead {
  max-width: 760px;
  color: var(--ink-soft);
  font-size: clamp(1.08rem, 2.2vw, 1.35rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--accent);
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 12px 28px rgba(49, 184, 161, 0.2);
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.button:hover {
  color: var(--ink);
  transform: translateY(-1px);
  box-shadow: 0 15px 32px rgba(49, 184, 161, 0.27);
}

.button.secondary {
  border-color: rgba(19, 33, 61, 0.13);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: none;
}

.hero-mark {
  position: relative;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 38%;
  background: linear-gradient(145deg, var(--mint), var(--mint-strong));
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-mark::before,
.hero-mark::after {
  content: "";
  position: absolute;
  border: 2px solid rgba(49, 184, 161, 0.3);
  border-radius: 50%;
}

.hero-mark::before {
  inset: 14%;
}

.hero-mark::after {
  inset: 27%;
}

.hero-mark img {
  position: relative;
  z-index: 2;
  width: 44%;
  border-radius: 24%;
  box-shadow: 0 16px 36px rgba(19, 33, 61, 0.18);
}

.trust-row,
.card-grid {
  display: grid;
  gap: 18px;
}

.trust-row {
  grid-template-columns: repeat(3, 1fr);
  margin: 48px 0 76px;
}

.trust-item {
  padding: 22px;
  border: 1px solid rgba(19, 33, 61, 0.08);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.62);
}

.trust-item strong {
  display: block;
  margin-bottom: 4px;
}

.trust-item span {
  color: var(--ink-soft);
  font-size: 0.94rem;
}

.section-heading {
  max-width: 780px;
  margin-bottom: 30px;
}

.card-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.link-card {
  min-height: 240px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 32px;
  border: 1px solid rgba(19, 33, 61, 0.08);
  border-radius: var(--radius-lg);
  background: var(--card);
  color: var(--ink);
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: transform 160ms ease, border-color 160ms ease;
}

.link-card:hover {
  color: var(--ink);
  border-color: rgba(49, 184, 161, 0.42);
  transform: translateY(-3px);
}

.link-card .icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 15px;
  background: var(--mint);
  color: var(--accent-deep);
  font-size: 1.3rem;
  font-weight: 900;
}

.link-card p {
  color: var(--ink-soft);
}

.link-card .arrow {
  color: var(--accent-deep);
  font-size: 1.3rem;
  font-weight: 900;
}

.document-hero {
  padding: 36px 0 30px;
}

.document-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.document-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  align-items: start;
  gap: 42px;
}

.toc {
  position: sticky;
  top: 104px;
  padding: 22px;
  border: 1px solid rgba(19, 33, 61, 0.08);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.66);
}

.toc strong {
  display: block;
  margin-bottom: 10px;
}

.toc a {
  display: block;
  padding: 5px 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 620;
  text-decoration: none;
}

.toc a:hover {
  color: var(--ink);
}

.document {
  padding: 40px;
  border: 1px solid rgba(19, 33, 61, 0.08);
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow);
}

.document section + section {
  margin-top: 38px;
  padding-top: 38px;
  border-top: 1px solid var(--line);
}

.document li + li {
  margin-top: 8px;
}

.document ul,
.document ol {
  padding-left: 1.35em;
}

.callout {
  margin: 24px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--mint);
}

.callout.warning {
  border-left-color: #e6a52c;
  background: #fff6df;
  color: #684711;
}

.contact-card {
  margin-top: 44px;
  padding: 30px;
  border-radius: var(--radius-lg);
  background: var(--mint);
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.faq-card {
  padding: 26px;
  border: 1px solid rgba(19, 33, 61, 0.08);
  border-radius: var(--radius-md);
  background: var(--card);
  box-shadow: 0 10px 26px rgba(19, 33, 61, 0.05);
}

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

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border-radius: 999px;
  color: #0f6658;
  background: var(--mint);
  font-size: 0.86rem;
  font-weight: 800;
}

.status-pill::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.site-footer {
  padding: 34px 0 48px;
  border-top: 1px solid rgba(19, 33, 61, 0.1);
}

.footer-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 30px;
}

.footer-copy {
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.footer-links a {
  color: var(--ink-soft);
  font-size: 0.88rem;
  font-weight: 650;
  text-decoration: none;
}

.locale-panel {
  animation: locale-in 180ms ease both;
}

html[data-locale="en"] .locale-panel[data-locale="zh"],
html[data-locale="zh"] .locale-panel[data-locale="en"],
html[data-locale="en"] [data-locale-inline="zh"],
html[data-locale="zh"] [data-locale-inline="en"] {
  display: none !important;
}

@keyframes locale-in {
  from { opacity: 0; transform: translateY(3px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 860px) {
  .nav-links {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 42px;
    min-height: auto;
  }

  .hero-mark {
    width: min(78vw, 390px);
    margin: 0 auto;
  }

  .trust-row,
  .card-grid,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .document-layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }
}

@media (max-width: 580px) {
  body {
    font-size: 16px;
  }

  .site-shell {
    width: min(calc(100% - 24px), var(--content));
  }

  .header-row {
    min-height: 66px;
  }

  .brand span {
    display: none;
  }

  main {
    padding: 46px 0 62px;
  }

  .hero {
    gap: 34px;
  }

  .trust-row {
    margin: 34px 0 58px;
  }

  .link-card,
  .document,
  .contact-card {
    padding: 24px;
  }

  .document-hero {
    padding-top: 20px;
  }

  .footer-row {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .site-header,
  .toc,
  .site-footer,
  .language-switch {
    display: none !important;
  }

  body,
  html {
    background: #fff;
  }

  main {
    padding: 0;
  }

  .site-shell {
    width: 100%;
  }

  .document-layout {
    display: block;
  }

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