:root {
  --ink: #15211c;
  --muted: #5c6b63;
  --green: #173f32;
  --soft-green: #dce8dc;
  --lime: #dff1a8;
  --paper: #f8f6ef;
  --line: #ccd6ce;
  --white: #fffef9;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif; }
a { color: inherit; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 20; padding: 10px 14px; background: var(--white); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
.site-header { min-height: 76px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 32px; padding: 0 5vw; border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--paper) 92%, transparent); }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; letter-spacing: .08em; }
.brand span { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50% 50% 50% 12px; background: var(--green); color: white; font: 700 17px Georgia, serif; }
.brand strong { font: 700 16px Georgia, serif; }
.site-header nav { display: flex; justify-content: center; gap: clamp(15px, 2.3vw, 34px); }
.site-header nav a, .header-cta { font-size: 13px; text-decoration: none; }
.site-header nav a:hover, .site-header nav a:focus, .footer-links a:hover { text-decoration: underline; text-underline-offset: 5px; }
.header-cta { padding: 10px 18px; border-radius: 99px; background: var(--green); color: white; }
main { min-height: 72vh; }
.breadcrumbs { max-width: 1180px; margin: 0 auto; padding: 24px 5vw 0; color: var(--muted); font-size: 12px; }
.breadcrumbs a, .breadcrumbs span { text-decoration: none; }
.breadcrumbs i { margin: 0 9px; font-style: normal; color: #9ba69f; }
.hero { max-width: 1180px; margin: 0 auto; padding: clamp(72px, 10vw, 138px) 5vw clamp(62px, 8vw, 110px); }
.home-hero { min-height: 660px; display: flex; flex-direction: column; justify-content: center; }
.eyebrow { margin: 0 0 28px; color: #537265; font: 700 11px/1.3 Georgia, serif; letter-spacing: .19em; }
h1 { max-width: 980px; margin: 0; font: 500 clamp(48px, 7vw, 92px)/1.02 Georgia, "Songti SC", serif; letter-spacing: -.045em; }
.intro { max-width: 720px; margin: 34px 0 0; color: var(--muted); font-size: clamp(16px, 1.6vw, 20px); line-height: 1.8; }
.article-meta { margin: 24px 0 0; color: var(--muted); font-size: 13px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 20px; margin-top: 36px; }
.primary-link, .secondary-link { display: inline-flex; align-items: center; gap: 18px; font-size: 14px; text-decoration: none; }
.primary-link { padding: 14px 20px; border-radius: 4px; background: var(--green); color: white; }
.secondary-link { padding-bottom: 5px; border-bottom: 1px solid var(--ink); }
.content-grid { border-top: 1px solid var(--line); }
.content-section { display: grid; grid-template-columns: minmax(100px, .34fr) minmax(0, 1fr); gap: 30px; max-width: 1180px; margin: 0 auto; padding: 58px 5vw; border-bottom: 1px solid var(--line); }
.section-label { margin: 4px 0 0; color: #62766b; font: 700 11px Georgia, serif; letter-spacing: .12em; }
.content-section h2 { max-width: 650px; margin: 0; font: 500 clamp(28px, 3vw, 42px)/1.2 Georgia, "Songti SC", serif; }
.content-section div > p { max-width: 720px; margin: 20px 0 0; color: var(--muted); font-size: 16px; line-height: 1.85; }
.section-links { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 24px; }
.section-links a { font-size: 13px; text-underline-offset: 5px; }
.knowledge-next { max-width: 1180px; margin: 80px auto; padding: 42px 5vw; background: var(--soft-green); }
.knowledge-next > p { margin: 0 0 22px; color: #587064; font-size: 12px; letter-spacing: .12em; }
.knowledge-next div { display: flex; flex-wrap: wrap; gap: 12px; }
.knowledge-next a { padding: 10px 14px; border: 1px solid #aebfb3; border-radius: 99px; font-size: 13px; text-decoration: none; }
footer { display: grid; grid-template-columns: 1.4fr 1fr; align-items: end; gap: 34px; padding: 58px 5vw; background: var(--green); color: white; }
.footer-brand span { background: var(--lime); color: var(--green); }
footer > div > p { max-width: 440px; margin: 18px 0 0; color: #c4d4ca; font-size: 13px; line-height: 1.7; }
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-links a { color: #e7efe9; font-size: 12px; text-decoration: none; }
.legal-row { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 10px 24px; padding-top: 24px; border-top: 1px solid #527065; color: #e2ebe5; font-size: 12px; line-height: 1.6; }
.legal-row a { color: #e2ebe5; text-decoration: none; }
.legal-row a:hover, .legal-row a:focus { text-decoration: underline; text-underline-offset: 4px; }

@media (max-width: 900px) {
  .site-header { grid-template-columns: 1fr auto; }
  .site-header nav { grid-column: 1 / -1; grid-row: 2; justify-content: flex-start; overflow-x: auto; padding-bottom: 15px; }
  .home-hero { min-height: 560px; }
  footer { grid-template-columns: 1fr; align-items: start; }
}

@media (max-width: 640px) {
  .site-header { padding: 14px 20px 0; gap: 18px; }
  .site-header nav { gap: 20px; }
  .site-header nav a { white-space: nowrap; }
  .hero, .breadcrumbs { padding-left: 22px; padding-right: 22px; }
  .content-section { grid-template-columns: 1fr; padding: 42px 22px; }
  .knowledge-next { margin: 52px 0; padding: 34px 22px; }
  footer { padding: 46px 22px; }
}

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