:root{
  --ink:#1c2540;
  --paper:#fcfbf8;
  --seal:#b5342c;
  --seal-soft:#f6e9e7;
  --line:#d9d5cb;
  --muted:#6b7183;
  --gold:#8a6d2f;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto;} *{animation:none!important;transition:none!important;}}
body{
  font-family:'Noto Sans SC','PingFang SC','Microsoft YaHei','Hiragino Sans GB',sans-serif;
  background:var(--paper);color:var(--ink);line-height:1.75;font-size:16px;
}
a{color:var(--seal);text-decoration:none;}
a:hover{text-decoration:underline;}
a:focus-visible,button:focus-visible{outline:3px solid var(--seal);outline-offset:2px;}
.wrap{max-width:1000px;margin:0 auto;padding:0 22px;}

/* ---------- header / nav ---------- */
header.site{
  border-bottom:2px solid var(--ink);
  background:var(--paper);
  position:sticky;top:0;z-index:50;
}
.nav{display:flex;align-items:center;gap:16px;padding:14px 0;flex-wrap:wrap;}
.brandlink{
  display:flex;align-items:center;gap:16px;text-decoration:none;color:inherit;
}
.brandlink:hover{text-decoration:none;}
.brandlink:hover .brandname{color:var(--seal);}
.brandmark{
  flex:none;width:46px;height:46px;border:2px solid var(--seal);border-radius:50%;
  color:var(--seal);display:flex;flex-direction:column;align-items:center;justify-content:center;
  transform:rotate(-8deg);position:relative;
}
.brandmark::after{content:"";position:absolute;inset:3px;border:1px solid var(--seal);border-radius:50%;opacity:.5;}
.brandmark .zh{font-family:'Noto Serif SC',serif;font-weight:700;font-size:13px;letter-spacing:1px;line-height:1.1;text-align:center;}
.brandname{font-family:'Noto Serif SC',serif;font-weight:700;font-size:20px;letter-spacing:1px;}
.brandname span{display:block;font-size:11.5px;font-weight:400;color:var(--muted);letter-spacing:1.5px;margin-top:2px;}
nav.menu{margin-left:auto;display:flex;gap:20px;flex-wrap:wrap;}
nav.menu a{color:var(--ink);font-weight:600;font-size:14.5px;}
nav.menu a.active{color:var(--seal);border-bottom:2px solid var(--seal);}
nav.menu a:hover{text-decoration:none;color:var(--seal);}
.nav-cta{background:var(--seal);color:#fff!important;padding:8px 16px;border-radius:3px;font-size:14.5px;}
.nav-cta:hover{background:#9c2b24;text-decoration:none!important;}

/* ---------- hero ---------- */
.hero{padding:52px 0 34px;}
.hero-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:38px;align-items:center;}
.hero .eyebrow{
  font-size:12.5px;font-weight:700;letter-spacing:3px;color:var(--seal);margin-bottom:14px;
}
.hero h1{
  font-family:'Noto Serif SC',serif;font-weight:700;
  font-size:clamp(26px,3.6vw,38px);line-height:1.4;letter-spacing:.5px;
}
.hero .sub{
  color:var(--seal);font-size:clamp(15px,2vw,18px);margin-top:14px;font-weight:700;letter-spacing:1px;
}
.hero p.lede{color:var(--muted);margin-top:16px;font-size:15.5px;}
.portrait{
  border:1px solid var(--line);padding:8px;background:#fff;max-width:330px;justify-self:end;
}
.portrait img{width:100%;display:block;}
.portrait .cap{
  font-size:13px;color:var(--muted);text-align:center;padding:10px 4px 4px;line-height:1.6;
}
.portrait .cap b{color:var(--ink);display:block;font-family:'Noto Serif SC',serif;font-size:15px;margin-bottom:3px;}
.cta-row{display:flex;gap:14px;margin-top:26px;flex-wrap:wrap;}
.btn{
  display:inline-block;padding:13px 26px;border-radius:3px;font-weight:700;font-size:15px;
  background:var(--seal);color:#fff;border:2px solid var(--seal);
}
.btn:hover{background:#9c2b24;text-decoration:none;}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--ink);}
.btn.ghost:hover{background:var(--ink);color:var(--paper);}

/* ---------- chain ---------- */
.chain{
  margin:40px 0 8px;border:1px solid var(--line);background:#fff;padding:26px 22px 20px;
}
.chain .chain-title{font-size:12.5px;font-weight:700;letter-spacing:2px;color:var(--muted);margin-bottom:20px;text-align:center;}
.chain-track{display:flex;align-items:stretch;justify-content:space-between;}
.chain-step{flex:1;text-align:center;position:relative;padding:0 6px;}
.chain-step:not(:last-child)::after{
  content:"→";position:absolute;right:-8px;top:14px;color:var(--seal);font-size:18px;font-weight:700;
}
.chain-step .dot{
  width:44px;height:44px;margin:0 auto 10px;border:2px solid var(--ink);border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-family:'Noto Serif SC',serif;font-weight:700;font-size:16px;background:var(--paper);
}
.chain-step:last-child .dot{border-color:var(--seal);color:var(--seal);}
.chain-step b{display:block;font-size:14px;}
.chain-step span{display:block;font-size:12px;color:var(--muted);margin-top:2px;}

/* ---------- sections ---------- */
section.band{padding:48px 0;}
section.band.alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.sec-eyebrow{font-size:12.5px;font-weight:700;letter-spacing:3px;color:var(--seal);margin-bottom:10px;}
h2.sec{
  font-family:'Noto Serif SC',serif;font-weight:700;font-size:clamp(22px,3vw,29px);margin-bottom:22px;letter-spacing:.5px;
}

.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.card{
  border:1px solid var(--line);background:var(--paper);padding:22px 20px;
  display:flex;flex-direction:column;
}
.card.hot{border:2px solid var(--seal);position:relative;}
.card.hot .tag{
  position:absolute;top:-11px;left:16px;background:var(--seal);color:#fff;
  font-size:11px;font-weight:700;letter-spacing:1.5px;padding:2px 10px;
}
.card h3{font-family:'Noto Serif SC',serif;font-weight:700;font-size:18px;margin-bottom:10px;}
.card p{font-size:14.5px;color:var(--muted);flex:1;}
.card a.more{margin-top:12px;font-weight:700;font-size:14.5px;}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.step{border-top:3px solid var(--seal);padding-top:14px;}
.step b{display:block;font-size:15.5px;margin-bottom:6px;}
.step p{font-size:14px;color:var(--muted);}

/* trust list */
.trust-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px 32px;}
.trust-item{padding-left:22px;position:relative;font-size:15px;}
.trust-item::before{content:"";position:absolute;left:0;top:9px;width:9px;height:9px;border:2px solid var(--seal);border-radius:50%;}
.trust-item b{display:block;margin-bottom:3px;}
.trust-item span{color:var(--muted);font-size:14px;}

/* article list (long-tail index) */
.artlist{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
.artcard{
  border:1px solid var(--line);background:#fff;padding:16px 18px;
}
.artcard .kind{font-size:11.5px;font-weight:700;letter-spacing:2px;color:var(--seal);}
.artcard h3{font-family:'Noto Serif SC',serif;font-weight:700;font-size:16.5px;margin:6px 0 6px;line-height:1.5;}
.artcard h3 a{color:var(--ink);}
.artcard h3 a:hover{color:var(--seal);text-decoration:none;}
.artcard p{font-size:13.5px;color:var(--muted);}

/* article body */
article.guide{max-width:760px;}
article.guide h2{font-family:'Noto Serif SC',serif;font-weight:700;font-size:22px;margin:34px 0 12px;}
article.guide h3{font-size:17px;margin:24px 0 8px;}
article.guide p{margin-bottom:16px;font-size:16px;}
article.guide ol,article.guide ul{margin:0 0 18px 24px;font-size:16px;}
article.guide li{margin-bottom:9px;}
.callout{border-left:4px solid var(--seal);background:var(--seal-soft);padding:16px 20px;margin:22px 0;font-size:15px;}
.callout b{color:var(--seal);}
.guide-cta{
  border:2px solid var(--ink);background:#fff;padding:24px;margin:34px 0;
}
.guide-cta h3{font-family:'Noto Serif SC',serif;font-weight:700;margin:0 0 8px;font-size:19px;}
.guide-cta p{color:var(--muted);font-size:15px;}

/* FAQ */
.faq{max-width:800px;}
.faq details{border-bottom:1px solid var(--line);padding:16px 0;}
.faq summary{font-weight:700;cursor:pointer;font-size:16px;}
.faq p{margin-top:10px;color:var(--muted);font-size:15px;}

/* contact */
.contact-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:34px;align-items:start;}
.contact-card{background:#fff;border:1px solid var(--line);padding:24px;}
.contact-line{display:flex;gap:12px;margin-bottom:13px;font-size:15px;}
.contact-line .k{flex:none;width:70px;font-weight:600;color:var(--muted);font-size:13.5px;padding-top:2px;}
.contact-line .v{font-weight:600;}
.qr-box{border:1px solid var(--line);padding:12px;margin-top:12px;background:var(--paper);}
.qr-box img{max-width:100%;display:block;}

/* footer */
footer.site{border-top:2px solid var(--ink);margin-top:56px;padding:30px 0 40px;font-size:13.5px;color:var(--muted);}
footer.site .cols{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;}
footer.site a{color:var(--muted);}
.fineprint{margin-top:20px;font-size:12px;line-height:1.7;border-top:1px solid var(--line);padding-top:14px;}

/* responsive */
@media (max-width:860px){
  .hero-grid{grid-template-columns:1fr;gap:26px;}
  .portrait{max-width:340px;margin:0 auto;}
  .cards{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr 1fr;}
  .trust-grid{grid-template-columns:1fr;}
  .artlist{grid-template-columns:1fr;}
  .contact-grid{grid-template-columns:1fr;}
  .chain-track{flex-wrap:wrap;gap:16px;}
  .chain-step{flex:1 1 40%;}
  .chain-step:not(:last-child)::after{display:none;}
  nav.menu{gap:13px;font-size:13.5px;}
}