:root{
  --bg:#f7f6f2;
  --surface:#fff;
  --ink:#17211e;
  --muted:#5c6662;
  --deep:#0e3b33;
  --teal:#1e6f63;
  --teal-soft:#dcece8;
  --amber:#ad571f;
  --cream:#f4ead6;
  --line:#dfe3de;
}
*{box-sizing:border-box}
html{font-size:18px}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.7}
a{color:inherit}
.site-header{height:74px;padding:0 max(24px,calc((100vw - 1120px)/2));display:flex;align-items:center;gap:38px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.96)}
.brand{display:inline-flex;align-items:center;gap:9px;text-decoration:none;white-space:nowrap}
.brand span{width:28px;height:28px;border-radius:6px;background:var(--deep) url('/assets/liujie-mark-192.png') center/cover no-repeat}
.brand b{font-size:1rem;color:var(--deep)}
.site-header nav{display:flex;gap:28px;flex:1}
.site-header nav a,.header-action{font-size:.82rem;text-decoration:none}
.site-header nav a:hover{color:var(--teal)}
.header-action{padding:9px 16px;background:var(--deep);color:#fff}
main{max-width:1120px;margin:0 auto;padding:0 28px 80px}
.breadcrumb{display:flex;gap:9px;padding:26px 0 0;font-size:.75rem;color:var(--muted)}
.breadcrumb a{text-decoration:none}
.page-hero{padding:74px 0 82px;max-width:890px}
.eyebrow{color:var(--teal);font-size:.75rem;font-weight:800}
.page-hero h1{font-size:3rem;line-height:1.22;letter-spacing:0;margin:19px 0 22px;max-width:860px}
.page-hero>p{font-size:1.05rem;color:var(--muted);max-width:760px;margin:0}
.page-updated{margin-top:18px!important;font-size:.74rem!important;color:#78817d!important}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:11px 21px;background:var(--teal);color:#fff;text-decoration:none;font-weight:700;font-size:.85rem;border:1px solid var(--teal)}
.button.secondary{background:transparent;color:var(--deep);border-color:#9bacA6}
.content-section{padding:64px 0;border-top:1px solid var(--line)}
.content-section>h2,.related>h2{font-size:1.75rem;line-height:1.3;margin:0 0 28px}
.prose{max-width:800px;color:var(--muted)}
.prose p{margin:0 0 18px}
.direct-answer{margin-top:28px;max-width:820px;padding:22px 24px;background:#e7f1ed;border-left:4px solid var(--teal)}
.direct-answer strong{display:block;color:var(--deep);font-size:.82rem;margin-bottom:6px}
.direct-answer p{margin:0;color:var(--ink);font-size:.94rem}
.steps{max-width:820px;margin:0;padding:0;list-style:none;counter-reset:step}
.steps li{counter-increment:step;display:grid;grid-template-columns:42px 1fr;gap:15px;padding:18px 0;border-top:1px solid var(--line);color:var(--muted);font-size:.92rem}
.steps li:last-child{border-bottom:1px solid var(--line)}
.steps li::before{content:counter(step,decimal-leading-zero);color:var(--amber);font-weight:800;font-size:.75rem;padding-top:2px}
.related-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.related-grid a{padding:18px 20px;background:var(--surface);border:1px solid var(--line);text-decoration:none;font-size:.84rem}
.related-grid b{float:right;color:var(--teal)}
.text-link{color:var(--teal);font-weight:700;text-decoration:none}
.item-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line)}
.item-grid article{background:var(--surface);padding:28px;min-height:190px}
.item-grid span{font-size:.7rem;color:var(--amber);font-weight:800}
.item-grid h3{font-size:1.05rem;margin:20px 0 7px}
.item-grid p{font-size:.84rem;color:var(--muted);margin:0}
.faq-list details{max-width:880px;border-top:1px solid var(--line);padding:20px 0}
.faq-list details:last-child{border-bottom:1px solid var(--line)}
.faq-list summary{cursor:pointer;font-weight:750;list-style-position:outside;margin-left:20px}
.faq-list details p{max-width:760px;color:var(--muted);font-size:.88rem;margin:12px 0 0 20px}
.references{padding:48px 0;border-top:1px solid var(--line)}
.references h2{font-size:1.35rem;line-height:1.3;margin:0 0 12px}
.references p{max-width:800px;color:var(--muted);font-size:.82rem;margin:0 0 16px}
.references ul{margin:0;padding-left:22px}
.references li{margin:7px 0;color:var(--muted);font-size:.82rem}
.references a{color:var(--teal);text-underline-offset:3px}
.related{padding:64px 0;border-top:1px solid var(--line)}
.related>div{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.related a{display:flex;justify-content:space-between;gap:18px;align-items:center;padding:18px 20px;background:var(--surface);border:1px solid var(--line);text-decoration:none;font-size:.82rem}
.related a:hover{border-color:var(--teal)}
.related b{color:var(--teal)}
.final-cta{display:flex;align-items:center;justify-content:space-between;gap:30px;background:var(--deep);color:#fff;padding:38px 42px;margin-top:24px}
.final-cta h2{font-size:1.65rem;line-height:1.3;margin:0 0 7px}
.final-cta p{font-size:.82rem;color:rgba(255,255,255,.72);margin:0}
.button.light{background:var(--cream);border-color:var(--cream);color:var(--deep);white-space:nowrap}
.home-foot{max-width:1064px;margin:0 auto;padding:20px 0 45px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:.72rem}
.home-foot a{color:inherit;text-underline-offset:3px}
.home-foot a:hover{color:var(--teal)}
.not-found{min-height:80vh;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;max-width:720px}
.not-found .eyebrow{margin-top:54px}
.not-found h1{font-size:2.6rem;margin:8px 0}
.not-found p:not(.eyebrow){color:var(--muted);margin:0 0 28px}
@media(max-width:720px){
  html{font-size:17px}
  .site-header{height:auto;padding:14px 18px;gap:16px;flex-wrap:wrap}
  .site-header nav{order:3;width:100%;gap:18px;overflow-x:auto;padding-top:8px;border-top:1px solid var(--line)}
  .site-header nav a{white-space:nowrap}
  .header-action{margin-left:auto}
  main{padding:0 18px 56px}
  .page-hero{padding:50px 0 58px}
  .page-hero h1{font-size:2.15rem}
  .item-grid{grid-template-columns:1fr}
  .item-grid article{min-height:0}
  .related>div{grid-template-columns:1fr}
  .related-grid{grid-template-columns:1fr}
  .final-cta{display:block;padding:28px 24px}
  .final-cta .button{margin-top:22px;width:100%}
  .home-foot{display:block;margin:0 18px;padding-bottom:30px;line-height:1.6}
  .home-foot span{display:block;margin-top:8px}
}