:root {
  color-scheme: light dark;
  --bg: #f7f3ec;
  --surface: #fffaf2;
  --ink: #1f2328;
  --muted: #667085;
  --line: #d8d0c3;
  --accent: #ff9500;
  --accent-ink: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  background: var(--bg);
  color: var(--ink);
  overflow-x: clip;
}

body {
  margin: 0;
  overflow-x: clip;
}

a {
  color: var(--accent);
}

.shell {
  width: min(920px, calc(100% - 32px));
  max-width: 100%;
  margin: 0 auto;
  padding-left: max(0px, env(safe-area-inset-left));
  padding-right: max(0px, env(safe-area-inset-right));
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 86%, transparent);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 20px;
}

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

.brand {
  font-size: 20px;
  font-weight: 700;
  text-decoration: none;
  color: var(--ink);
}

.nav-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
}

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.language-switch button {
  appearance: none;
  min-width: 44px;
  min-height: 32px;
  padding: 0 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  font-weight: 700;
}

.language-switch button[aria-pressed="true"] {
  background: var(--accent);
  color: var(--accent-ink);
}

.lang-zh {
  display: none;
}

html[data-lang="zh-CN"] .lang-en {
  display: none;
}

html[data-lang="zh-CN"] .lang-zh {
  display: revert;
}

.hero {
  padding: 72px 0 48px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
  font-size: 13px;
}

h1 {
  font-size: clamp(38px, 8vw, 64px);
  line-height: 1.02;
  margin: 0 0 20px;
  max-width: 760px;
}

h2 {
  font-size: 26px;
  line-height: 1.2;
  margin: 42px 0 12px;
}

h3 {
  font-size: 18px;
  margin: 28px 0 8px;
}

p {
  margin: 0 0 14px;
}

ul {
  margin: 0 0 20px;
  padding-left: 22px;
}

li {
  margin: 6px 0;
}

.lead {
  font-size: 20px;
  color: var(--muted);
  max-width: 720px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  text-decoration: none;
  font-weight: 700;
}

.button.secondary {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--line);
}

.content {
  padding: 40px 0 64px;
}

.panel {
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.meta {
  color: var(--muted);
  font-size: 14px;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 28px 0 calc(28px + env(safe-area-inset-bottom));
  font-size: 14px;
  line-height: 1.5;
  word-break: break-word;
}

.icp-filing {
  margin: 8px 0 0;
  font-size: 14px;
}

.icp-filing[hidden] {
  display: none;
}

.icp-filing--muted {
  font-size: 12px;
  color: color-mix(in srgb, var(--muted) 82%, transparent);
  letter-spacing: 0.01em;
}

.icp-filing a {
  color: var(--muted);
  text-decoration: none;
}

.icp-filing a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.psb-filing {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  vertical-align: middle;
}

.psb-filing img {
  display: block;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.icp-filing-sep {
  color: color-mix(in srgb, var(--muted) 70%, transparent);
}

body.page-doc .content {
  padding-bottom: calc(64px + env(safe-area-inset-bottom));
}

body.page-doc h1 {
  font-size: clamp(28px, 7vw, 48px);
}

body.page-doc h2 {
  font-size: clamp(22px, 5vw, 26px);
}

body.page-doc h3 {
  font-size: clamp(17px, 4.2vw, 18px);
}

body.page-doc .lead {
  font-size: clamp(16px, 4vw, 20px);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161614;
    --surface: #20201d;
    --ink: #f5f2eb;
    --muted: #aaa69d;
    --line: #3a3730;
    --accent: #ffb340;
    --accent-ink: #1a1208;
  }
}

@media (max-width: 720px) {
  .shell {
    width: min(920px, calc(100% - 24px));
  }

  .nav {
    flex-wrap: wrap;
    gap: 12px;
    min-height: 60px;
  }

  .nav-actions {
    width: 100%;
    justify-content: space-between;
    gap: 10px;
  }

  .nav-links {
    gap: 12px;
  }

  .nav-links a {
    font-size: 14px;
  }

  .language-switch button {
    min-width: 40px;
    min-height: 36px;
    padding: 0 8px;
    font-size: 13px;
  }
}

@media (max-width: 560px) {
  .shell {
    width: min(920px, calc(100% - 20px));
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }

  .nav-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
    width: 100%;
  }

  .nav-links {
    flex-wrap: wrap;
  }

  .hero {
    padding: 48px 0 40px;
  }

  .content {
    padding: 32px 0 48px;
  }

  .lead {
    font-size: 18px;
  }

  h2 {
    margin-top: 32px;
  }
}

@media (max-width: 390px) {
  .brand {
    font-size: 18px;
  }

  .nav-actions {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
  }

  .language-switch {
    flex-shrink: 0;
  }
}

@media (max-width: 320px) {
  .shell {
    width: calc(100% - 16px);
  }

  .language-switch button {
    min-width: 36px;
    min-height: 34px;
    padding: 0 6px;
  }
}