:root{
  --ink:#07080B;
  --ink2:#0C0E13;
  --paper:#F1EADB;
  --paper-dim:#D7CDBA;
  --gold:#C9A24A;
  --gold-2:#E0BD74;
  --muted:#8C8578;
  --line:rgba(201,162,74,.28);
  --line-soft:rgba(241,234,219,.12);
  --max:1220px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--ink);color:var(--paper);
  font-family:"Segoe UI","Microsoft YaHei","PingFang SC",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;line-height:1.7;
}
::selection{background:var(--gold);color:var(--ink)}
a{color:inherit;text-decoration:none}

.grain{
  position:fixed;inset:0;pointer-events:none;z-index:50;opacity:.055;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* top */
.top{
  position:fixed;top:0;left:0;right:0;z-index:40;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:20px 34px;border-bottom:1px solid var(--line-soft);
  background:rgba(7,8,11,.78);backdrop-filter:blur(14px);
}
.brand{font-family:"Iowan Old Style","Palatino Linotype","Songti SC",serif;font-size:15px;letter-spacing:.22em}
.brand-a{color:var(--paper)}
.brand-s{color:var(--gold);margin-left:8px}
.nav{display:flex;gap:22px;font-size:11px;letter-spacing:.14em;color:var(--paper-dim)}
.nav a{opacity:.78;transition:opacity .2s,color .2s}
.nav a:hover{opacity:1;color:var(--gold-2)}
.status{font-size:9px;letter-spacing:.18em;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:6px 10px;white-space:nowrap}

/* shared */
.chapter{max-width:var(--max);margin:0 auto;padding:120px 34px;border-top:1px solid var(--line-soft);position:relative}
.mobile-break{display:none}
.chapter.alt{background:linear-gradient(180deg,rgba(255,255,255,.018),transparent 60%)}
.chapter-head{display:grid;grid-template-columns:80px 1fr;gap:24px;align-items:start;margin-bottom:58px}
.num{font-family:"Iowan Old Style","Palatino Linotype",serif;font-size:13px;color:var(--gold);letter-spacing:.12em;padding-top:10px}
.eyebrow{font-size:10px;letter-spacing:.26em;color:var(--gold);margin-bottom:18px}
h2{font-family:"Iowan Old Style","Palatino Linotype","Songti SC",serif;font-weight:500;font-size:clamp(34px,4.4vw,64px);line-height:1.1;letter-spacing:-.02em;margin:0;color:var(--paper)}
.chapter-body{display:grid;gap:36px}
.chapter-body.two{grid-template-columns:1.1fr .9fr;gap:70px;align-items:start}
.lead{font-family:"Iowan Old Style","Palatino Linotype","Songti SC",serif;font-size:clamp(22px,2.2vw,31px);line-height:1.45;color:var(--paper);margin:0 0 24px}
.lead.wide{max-width:840px}
p{font-size:15px;color:var(--paper-dim);margin:0 0 16px}
strong{color:var(--paper);font-weight:600}
.fine{font-size:11px;color:var(--muted);letter-spacing:.02em;margin-top:18px;max-width:760px}
.quote{border-left:1px solid var(--line);padding:8px 0 8px 26px;align-self:start}
.quote p{font-family:"Iowan Old Style","Palatino Linotype","Songti SC",serif;font-size:clamp(20px,2vw,28px);line-height:1.5;color:var(--gold-2);margin-bottom:16px}
.quote span{font-size:10px;letter-spacing:.18em;color:var(--muted)}

/* hero */
.hero{
  min-height:100vh;position:relative;display:flex;flex-direction:column;justify-content:center;
  padding:150px 34px 42px;max-width:var(--max);margin:0 auto;overflow:hidden;
}
.hero-orbit{position:absolute;right:-10vw;top:8vh;width:62vw;height:62vw;max-width:780px;max-height:780px;pointer-events:none;opacity:.8}
.ring{position:absolute;border:1px solid var(--line);border-radius:50%;inset:0;transform:rotate(-18deg)}
.ring.r1{inset:12%}
.ring.r2{inset:26%;border-color:rgba(201,162,74,.18)}
.ring.r3{inset:40%;border-color:rgba(201,162,74,.12)}
.core{position:absolute;left:50%;top:50%;width:2px;height:2px;background:var(--gold);border-radius:50%;box-shadow:0 0 40px 12px rgba(201,162,74,.32)}
.hero-meta{position:absolute;top:112px;left:34px;right:34px;display:flex;justify-content:space-between;gap:20px;font-size:9px;letter-spacing:.2em;color:var(--muted)}
.hero-title{font-family:"Iowan Old Style","Palatino Linotype","Songti SC",serif;font-weight:500;margin:0;line-height:.84;letter-spacing:-.055em;position:relative;z-index:2}
.hero-title .line1{display:block;font-size:clamp(74px,14.5vw,206px);color:var(--paper)}
.hero-title .line2{display:block;font-size:clamp(74px,14.5vw,206px);color:var(--gold);margin-left:.055em}
.hero-cn{font-family:"Songti SC","STSong","SimSun",serif;font-size:clamp(22px,2.7vw,40px);letter-spacing:.42em;color:var(--paper-dim);margin:26px 0 8px;position:relative;z-index:2}
.hero-lead{font-family:"Iowan Old Style","Palatino Linotype","Songti SC",serif;font-size:clamp(22px,2.6vw,36px);color:var(--paper);margin:24px 0 6px;position:relative;z-index:2}
.hero-sub{font-size:14px;color:var(--muted);letter-spacing:.06em;margin:0;position:relative;z-index:2}
.hero-actions{display:flex;gap:12px;margin-top:34px;position:relative;z-index:2}
.btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);color:var(--paper-dim);padding:11px 20px;font-size:11px;letter-spacing:.12em;border-radius:999px;transition:all .2s}
.btn:hover{border-color:var(--gold);color:var(--gold-2)}
.btn.gold{background:var(--gold);border-color:var(--gold);color:var(--ink);font-weight:700}
.btn.gold:hover{background:var(--gold-2);color:var(--ink)}
.hero-foot{position:absolute;left:34px;right:34px;bottom:32px;display:flex;justify-content:space-between;border-top:1px solid var(--line-soft);padding-top:14px;font-size:9px;letter-spacing:.18em;color:var(--muted)}
.scroll{color:var(--gold)}

/* statline */
.statline{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--line);margin-top:54px}
.statline div{padding:22px 20px 0 0;font-size:12px;letter-spacing:.08em;color:var(--paper-dim);border-right:1px solid var(--line-soft)}
.statline div:last-child{border-right:0}
.statline span{display:block;font-family:"Iowan Old Style",serif;color:var(--gold);font-size:11px;margin-bottom:8px}

/* cards */
.cards{display:grid;gap:0;border-top:1px solid var(--line);margin-top:26px}
.cards.three{grid-template-columns:repeat(3,1fr)}
.card{padding:28px 28px 28px 0;border-right:1px solid var(--line-soft)}
.card:last-child{border-right:0}
.card-no{font-family:"Iowan Old Style",serif;color:var(--gold);font-size:12px;letter-spacing:.16em}
.card h3{font-family:"Iowan Old Style","Songti SC",serif;font-size:24px;font-weight:500;margin:22px 0 10px;color:var(--paper)}
.card p{font-size:14px;color:var(--muted);margin:0}
.cards.three .card:nth-child(3n){border-right:0}

/* layers */
.layers{border-top:1px solid var(--line);margin-top:20px}
.layer{display:grid;grid-template-columns:78px 1fr;gap:26px;padding:24px 0;border-bottom:1px solid var(--line-soft);align-items:start}
.layer-id{font-family:"Iowan Old Style",serif;color:var(--gold);font-size:13px;letter-spacing:.12em;padding-top:6px}
.layer h3{font-family:"Iowan Old Style","Songti SC",serif;font-size:26px;font-weight:500;margin:0 0 8px}
.layer p{font-size:14px;color:var(--muted);margin:0;max-width:760px}

/* protocol */
.protocol-grid{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-left:1px solid var(--line-soft);margin-top:34px}
.protocol-grid > div{padding:24px;border-right:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.protocol-grid span{font-family:"Iowan Old Style",serif;color:var(--gold);font-size:11px;letter-spacing:.14em}
.protocol-grid h3{font-family:"Iowan Old Style","Songti SC",serif;font-size:22px;font-weight:500;margin:16px 0 8px;color:var(--paper)}
.protocol-grid p{font-size:13px;color:var(--muted);margin:0}

/* lines */
.lines{display:grid;grid-template-columns:1fr 1fr;gap:0;border-top:1px solid var(--line);border-left:1px solid var(--line-soft)}
.line-card{padding:30px;border-right:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft);min-height:250px;display:flex;flex-direction:column}
.line-code{font-size:10px;letter-spacing:.18em;color:var(--gold);margin-bottom:28px}
.line-card h3{font-family:"Iowan Old Style","Songti SC",serif;font-size:44px;font-weight:400;margin:0 0 10px;color:var(--paper)}
.line-card p{font-size:14px;color:var(--muted);margin:0 0 20px;max-width:430px}
.line-state{margin-top:auto;font-size:9px;letter-spacing:.16em;color:var(--muted);border-top:1px solid var(--line-soft);padding-top:12px}
.line-link{display:inline-block;margin-top:10px;font-size:10px;letter-spacing:.1em;color:var(--gold);border-bottom:1px solid var(--line);align-self:flex-start;padding-bottom:2px}

/* rights */
.rights{margin-top:30px;border-top:1px solid var(--line)}
.rights > div{display:grid;grid-template-columns:38px 80px 1fr;gap:12px;padding:15px 0;border-bottom:1px solid var(--line-soft);align-items:baseline}
.rights span{font-family:"Iowan Old Style",serif;color:var(--gold);font-size:11px}
.rights b{font-size:16px;color:var(--paper);font-weight:600}
.rights p{margin:0;font-size:13px;color:var(--muted)}

/* roadmap */
.roadmap{border-top:1px solid var(--line)}
.step{display:grid;grid-template-columns:90px 220px 1fr;gap:20px;padding:22px 0;border-bottom:1px solid var(--line-soft);align-items:baseline}
.step span{font-size:10px;letter-spacing:.18em;color:var(--gold)}
.step h3{font-family:"Iowan Old Style","Songti SC",serif;font-weight:500;font-size:24px;margin:0;color:var(--paper)}
.step p{font-size:13px;color:var(--muted);margin:0}
.step.done span{color:var(--paper)}
.step.done h3{color:var(--gold-2)}

/* gov */
.gov{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--line)}
.gov > div{padding:26px 26px 26px 0;border-right:1px solid var(--line-soft)}
.gov > div:last-child{border-right:0}
.gov span{font-size:9px;letter-spacing:.2em;color:var(--gold)}
.gov h3{font-family:"Iowan Old Style","Songti SC",serif;font-size:23px;font-weight:500;margin:14px 0 8px}
.gov p{font-size:13px;color:var(--muted);margin:0}

/* entry */
.entry{max-width:var(--max);margin:0 auto;padding:130px 34px;border-top:1px solid var(--line)}
.entry-meta{font-size:10px;letter-spacing:.2em;color:var(--gold);margin-bottom:26px}
.entry h2{font-size:clamp(38px,5vw,78px);max-width:1000px}
.entry > p{font-size:16px;color:var(--muted);max-width:720px;margin:24px 0 54px}
.entry-grid{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-left:1px solid var(--line-soft)}
.entry-grid > div{padding:20px;border-right:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.entry-grid span{font-size:9px;letter-spacing:.16em;color:var(--gold)}
.entry-grid p{font-size:12px;color:var(--muted);margin:10px 0 0}
.entry-note{font-size:10px;color:var(--muted);margin-top:26px;letter-spacing:.04em}

/* foot */
.foot{max-width:var(--max);margin:0 auto;padding:26px 34px 46px;border-top:1px solid var(--line-soft);display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:end}
.foot-brand{font-family:"Iowan Old Style",serif;letter-spacing:.2em;color:var(--paper)}
.foot-brand span{color:var(--gold)}
.foot-copy{font-size:11px;color:var(--muted);text-align:right}
.foot-small{grid-column:1/-1;font-size:9px;letter-spacing:.12em;color:#5F5A50;border-top:1px solid var(--line-soft);padding-top:14px}

/* reveal */
.reveal{opacity:1;transform:none;transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

@media (max-width:980px){
  .nav{display:none}
  /* 手机竖版：顶栏只留在首屏，滚动时不压正文 */
  .top{position:absolute;top:0;padding:15px 20px;background:rgba(7,8,11,.55)}
  .hero{padding:112px 20px 28px;min-height:100svh}
  .hero-meta,.hero-foot{left:20px;right:20px}
  .hero-meta{font-size:8px;letter-spacing:.14em;gap:12px}
  .hero-meta span:nth-child(2){display:none}
  .hero-orbit{right:-30vw;top:14vh;width:90vw;height:90vw;opacity:.45}
  .chapter{padding:64px 20px}
  .chapter-head{grid-template-columns:32px 1fr;gap:8px;margin-bottom:34px}
  .chapter-body{gap:24px}
  .chapter-body.two{grid-template-columns:1fr;gap:28px}
  .cards.three{grid-template-columns:1fr}
  .card{border-right:0;border-bottom:1px solid var(--line-soft);padding:22px 0}
  .protocol-grid{grid-template-columns:1fr 1fr}
  .protocol-grid > div{padding:20px}
  .lines{grid-template-columns:1fr}
  .line-card{border-right:0;min-height:0;padding:24px 20px}
  .line-code{margin-bottom:18px}
  .line-card h3{font-size:38px;margin:0 0 8px}
  .gov{grid-template-columns:1fr}
  .gov > div{border-right:0;border-bottom:1px solid var(--line-soft);padding:22px 0}
  .entry{padding:82px 20px}
  .entry h2{font-size:clamp(34px,8.8vw,46px)}
  .entry > p{margin:20px 0 34px}
  .entry-grid{grid-template-columns:1fr 1fr}
  .step{grid-template-columns:58px 1fr;gap:8px}
  .step h3{font-size:22px}
  .step p{grid-column:2}
  .foot{grid-template-columns:1fr;padding:22px 20px 38px}
  .foot-copy{text-align:left}
  .statline{grid-template-columns:1fr}
  .statline div{border-right:0;border-bottom:1px solid var(--line-soft)}
}
@media (max-width:520px){
  h2{font-size:28px;line-height:1.2;letter-spacing:-.015em;line-break:strict;text-wrap:balance}
  .mobile-break{display:block}
  .hero-title .line1,.hero-title .line2{font-size:clamp(66px,17vw,74px)}
  .hero-cn{font-size:20px;letter-spacing:.22em;margin:20px 0 6px}
  .hero-lead{font-size:22px;line-height:1.5;margin-top:18px}
  .hero-sub{font-size:13px}
  .hero-actions{flex-direction:row;flex-wrap:wrap;align-items:center;gap:10px;margin-top:26px}
  .btn{padding:10px 16px}
  .hero-foot{font-size:8px}
  .protocol-grid{grid-template-columns:1fr}
  .line-card h3{font-size:34px}
  .line-link{margin-top:10px}
  .quote{padding-left:20px}
  .quote p{font-size:19px}
  .entry-grid{grid-template-columns:1fr}
  .rights > div{grid-template-columns:28px 58px 1fr;gap:10px}
  .rights b{font-size:15px}
  .rights p{font-size:12px}
  .step{grid-template-columns:52px 1fr}
  .step h3{font-size:21px}
  .step p{font-size:12px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
}