:root {
  color-scheme: light;
  --ink: #0f172a;
  --muted: #475569;
  --accent: #0369a1;
  --border: rgba(15, 23, 42, 0.1);
  --surface: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang HK", "Microsoft JhengHei",
    "Noto Sans HK", Roboto, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #f8fafc, #eef4ff 48%, #f3f7fb);
  line-height: 1.7;
}

.hero {
  max-width: 860px;
  margin: 0 auto;
  padding: 56px 24px 24px;
  text-align: center;
}

.eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 8px;
}

h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

h1 .zh {
  display: inline-block;
  margin-top: 4px;
  font-size: 0.75em;
  color: var(--muted);
}

.meta {
  color: var(--muted);
  font-size: 0.95rem;
  max-width: 640px;
  margin: 0 auto;
}

.lang-jump {
  margin-top: 20px;
  font-size: 0.9rem;
}

.lang-jump a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.lang-jump a:hover {
  text-decoration: underline;
}

.lang-jump span {
  margin: 0 8px;
  color: var(--muted);
}

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px 64px;
}

article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 32px clamp(20px, 4vw, 48px);
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.06);
  scroll-margin-top: 24px;
}

.lang-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin: 0 0 24px;
}

section {
  margin-bottom: 28px;
}

section:last-child {
  margin-bottom: 0;
}

h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 10px;
}

p, li {
  color: var(--muted);
  font-size: 0.96rem;
}

ul {
  padding-left: 1.25em;
  margin: 8px 0;
}

li {
  margin-bottom: 8px;
}

li:last-child {
  margin-bottom: 0;
}

strong {
  color: var(--ink);
}

code {
  background: rgba(15, 23, 42, 0.06);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.9em;
}

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

.divider {
  max-width: 860px;
  margin: 40px auto;
  border: none;
  border-top: 1px solid var(--border);
}

footer {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px 48px;
  text-align: center;
  color: var(--muted);
  font-size: 0.82rem;
}

@media (max-width: 640px) {
  article {
    border-radius: 16px;
  }
}