:root{
  --bg:#071018;
  --bg2:#0a1520;
  --panel:#0f1d2a;
  --panel2:#132432;
  --text:#eaf2f7;
  --muted:#9fb2c2;
  --line:#24394a;
  --cyan:#55d6c2;
  --blue:#6aa8ff;
  --gold:#e3b967;
  --rose:#ef8da2;
  --green:#8bd49c;
  --max:1180px;
  --shadow:0 18px 55px rgba(0,0,0,.28);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  color:var(--text);
  background:
    radial-gradient(circle at 12% 8%, rgba(85,214,194,.09), transparent 28rem),
    radial-gradient(circle at 86% 15%, rgba(106,168,255,.08), transparent 34rem),
    linear-gradient(180deg,var(--bg),#08131c 55%,#061019);
  font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.78;
  letter-spacing:.01em;
}
a{color:#8bc7ff;text-decoration:none}
a:hover{text-decoration:underline}
.progress{position:fixed;top:0;left:0;height:3px;background:linear-gradient(90deg,var(--cyan),var(--blue),var(--gold));width:0;z-index:9999}
.hero{
  min-height:88vh;
  display:flex;
  align-items:center;
  border-bottom:1px solid var(--line);
  position:relative;
  overflow:hidden;
}
.hero:before{
  content:"";
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(120,160,190,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(120,160,190,.04) 1px,transparent 1px);
  background-size:44px 44px;
  mask-image:linear-gradient(to bottom,black,transparent 90%);
}
.hero-inner{width:min(var(--max),92vw);margin:auto;position:relative;padding:90px 0 70px}
.kicker{font-size:.82rem;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan);font-weight:800}
h1{font-size:clamp(2.65rem,6vw,5.6rem);line-height:1.04;margin:.5rem 0 1.2rem;max-width:1050px;letter-spacing:-.045em}
.hero p{max-width:850px;font-size:1.12rem;color:#bfd0dc}
.hero-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:34px}
.metric{
  padding:18px 18px 16px;border:1px solid var(--line);border-radius:16px;
  background:rgba(15,29,42,.72);backdrop-filter:blur(8px);box-shadow:var(--shadow)
}
.metric strong{display:block;font-size:1.55rem;letter-spacing:-.03em}
.metric span{font-size:.84rem;color:var(--muted)}
.layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:48px;width:min(var(--max),92vw);margin:0 auto}
aside{position:relative}
.toc{position:sticky;top:28px;padding:28px 0 40px}
.toc-title{font-size:.78rem;color:#7f98aa;text-transform:uppercase;letter-spacing:.14em;margin-bottom:10px}
.toc a{display:block;color:#8fa7b8;padding:7px 0 7px 12px;border-left:1px solid #294052;font-size:.9rem;line-height:1.3}
.toc a.active{color:#eaf2f7;border-left:2px solid var(--cyan)}
main{padding:70px 0 100px;min-width:0}
section{padding:28px 0 34px;scroll-margin-top:30px}
h2{font-size:clamp(1.8rem,3vw,2.7rem);line-height:1.18;margin:0 0 18px;letter-spacing:-.03em}
h3{font-size:1.28rem;margin:30px 0 9px;letter-spacing:-.015em}
h4{font-size:1.02rem;margin:24px 0 8px}
p{color:#c7d5df}
.lede{font-size:1.1rem;color:#dbe7ee}
hr{border:0;border-top:1px solid var(--line);margin:34px 0}
.callout{
  border:1px solid var(--line);border-left:3px solid var(--cyan);border-radius:14px;
  padding:18px 20px;background:linear-gradient(135deg,rgba(85,214,194,.07),rgba(106,168,255,.035));margin:20px 0;
}
.callout strong{color:white}
.warning{border-left-color:var(--gold);background:rgba(227,185,103,.055)}
.quote{
  font-size:1.18rem;color:#f0f6f9;padding:24px 26px;margin:22px 0;
  border-radius:18px;background:#0c1923;border:1px solid var(--line);
}
.quote em{color:var(--cyan);font-style:normal}
.grid2,.grid3{display:grid;gap:16px;margin:18px 0}
.grid2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid3{grid-template-columns:repeat(3,minmax(0,1fr))}
.card{
  background:linear-gradient(180deg,rgba(18,36,50,.88),rgba(10,23,33,.85));
  border:1px solid var(--line);border-radius:18px;padding:20px;box-shadow:0 10px 35px rgba(0,0,0,.14)
}
.card h3,.card h4{margin-top:0}
.tag{display:inline-block;font-size:.76rem;font-weight:700;padding:4px 9px;border-radius:999px;background:rgba(85,214,194,.11);color:#8de6d8;border:1px solid rgba(85,214,194,.25);margin:2px 5px 2px 0}
.tag.blue{background:rgba(106,168,255,.1);color:#9fc5ff;border-color:rgba(106,168,255,.23)}
.tag.gold{background:rgba(227,185,103,.1);color:#f0cf8c;border-color:rgba(227,185,103,.23)}
.tag.rose{background:rgba(239,141,162,.09);color:#f5a9b9;border-color:rgba(239,141,162,.22)}
.timeline{position:relative;margin:24px 0 10px;padding-left:32px}
.timeline:before{content:"";position:absolute;left:8px;top:7px;bottom:10px;width:2px;background:linear-gradient(var(--cyan),var(--blue),var(--gold))}
.t-item{position:relative;margin:0 0 25px;padding:0 0 0 14px}
.t-item:before{content:"";position:absolute;left:-30px;top:8px;width:12px;height:12px;border-radius:50%;background:var(--bg);border:3px solid var(--cyan)}
.t-item:nth-child(2):before,.t-item:nth-child(3):before{border-color:var(--blue)}
.t-item:nth-child(n+4):before{border-color:var(--gold)}
.t-date{font-size:.8rem;letter-spacing:.09em;color:#8aa1b2;text-transform:uppercase;font-weight:800}
.t-title{font-size:1.18rem;font-weight:780;color:white;margin:3px 0}
.flow{
  display:flex;align-items:stretch;flex-wrap:wrap;gap:8px;margin:22px 0;
}
.node{
  flex:1 1 140px;min-width:125px;padding:14px 12px;text-align:center;border:1px solid #315064;
  background:#0d1b26;border-radius:14px;color:#dbe8ef;font-weight:650;font-size:.9rem;position:relative
}
.arrow{display:flex;align-items:center;color:#587489;font-weight:800}
.code{
  background:#061017;border:1px solid #203746;border-radius:16px;padding:18px 20px;
  font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;color:#c7e5ef;overflow:auto;font-size:.88rem;line-height:1.75
}
table{width:100%;border-collapse:collapse;margin:20px 0;font-size:.93rem}
th{text-align:left;color:#f2f6f8;background:#10212e}
th,td{padding:13px 14px;border:1px solid #263d4d;vertical-align:top}
td{color:#c1d0da;background:rgba(11,24,34,.65)}
.barset{margin:24px 0}
.barrow{display:grid;grid-template-columns:180px 1fr 70px;gap:12px;align-items:center;margin:10px 0}
.barlabel{font-size:.88rem;color:#bccbd5}
.track{height:13px;background:#132633;border-radius:999px;overflow:hidden;border:1px solid #254052}
.fill{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--blue),var(--cyan))}
.barval{text-align:right;font-variant-numeric:tabular-nums;color:#eaf3f8;font-weight:800}
.big-eq{
  font-size:clamp(1.25rem,2.7vw,2rem);font-weight:820;letter-spacing:-.025em;
  padding:24px;border-radius:18px;border:1px solid var(--line);background:#0d1b26;text-align:center;margin:22px 0
}
.big-eq span{color:var(--cyan)}
.split{display:grid;grid-template-columns:1fr 80px 1fr;align-items:center;gap:12px;margin:20px 0}
.split .mid{text-align:center;color:#6d8ba0;font-size:1.4rem}
.layer{
  border:1px solid var(--line);border-radius:18px;padding:18px;margin:12px 0;
  background:rgba(13,28,39,.85)
}
.layer b{color:#fff}
.checklist{padding-left:0;list-style:none}
.checklist li{margin:8px 0;color:#c7d5df;padding-left:26px;position:relative}
.checklist li:before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:800}
.bad li:before{content:"×";color:var(--rose)}
.small{font-size:.86rem;color:#8fa5b5}
.source{
  padding:16px 0;border-bottom:1px dashed #2a4152
}
.source b{display:block;color:#ecf4f8;margin-bottom:2px}
.source span{font-size:.84rem;color:#91a7b6}
.footer{
  border-top:1px solid var(--line);padding:38px 0 55px;color:#839bab;
  width:min(var(--max),92vw);margin:auto;font-size:.86rem
}
.pillline{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}
mark{background:rgba(227,185,103,.18);color:#ffe6ad;border-radius:5px;padding:1px 4px}
@media(max-width:900px){
  .hero-grid{grid-template-columns:repeat(2,1fr)}
  .layout{grid-template-columns:1fr}
  aside{display:none}
  main{padding-top:45px}
  .grid3{grid-template-columns:1fr}
}
@media(max-width:680px){
  .grid2,.split{grid-template-columns:1fr}
  .split .mid{transform:rotate(90deg)}
  .hero-grid{grid-template-columns:1fr 1fr}
  .barrow{grid-template-columns:115px 1fr 52px}
  h1{font-size:2.65rem}
  .hero{min-height:auto}
  .hero-inner{padding:75px 0 50px}
}
@media print{
  body{background:#fff;color:#111}
  aside,.progress{display:none!important}
  .layout{display:block;width:100%}
  main{padding:0}
  section{break-inside:avoid}
  .card,.callout,.quote,.layer,.big-eq{box-shadow:none;background:#fff;color:#111;border-color:#bbb}
  p,td,.small,.barlabel{color:#333}
  h1,h2,h3,h4,.metric strong{color:#111}
}

/* Shared Soren frame, with this note's research-system visual language. */
body{min-width:320px}
a:focus-visible{outline:2px solid var(--cyan);outline-offset:4px}
.sp-header{position:relative;z-index:2}
.sp-header .sp-brand,.sp-nav a{color:var(--text)}
.sp-footer{color:var(--muted)}
.hero{min-height:min(78vh,760px)}
.hero-inner{padding-top:clamp(48px,6vw,80px)}
.back-link{display:inline-block;margin-bottom:25px;color:#a6e9df;font-size:14px;text-decoration:none}
.back-link:hover{text-decoration:underline}
.note-context{max-width:850px;margin-top:22px;color:var(--muted);font-size:14px}
.toc{max-height:calc(100vh - 30px);overflow:auto}
.source a{overflow-wrap:anywhere}
@media(max-width:900px){
  .layout{grid-template-columns:minmax(0,1fr);gap:12px}
  .layout aside{display:block;min-width:0}
  .layout main{min-width:0;padding-top:24px}
  .toc{position:static;max-height:none;padding:14px 0 10px}
  .toc-title{margin-bottom:5px}
  .toc-links{display:flex;gap:4px 9px;overflow-x:auto;white-space:nowrap;scrollbar-width:thin}
  .toc a{flex:none;border-left:0;padding:8px 10px;border-bottom:1px solid var(--line)}
  .toc a.active{border-left:0;border-bottom:2px solid var(--cyan)}
}
@media(max-width:680px){
  .hero-inner{padding-top:48px}
  .hero-grid{gap:9px}
  .metric{padding:14px}
  .metric strong{font-size:1.12rem;overflow-wrap:anywhere}
  .metric span{font-size:.75rem}
  table{display:block;overflow-x:auto;white-space:nowrap}
  th,td{min-width:135px}
}
@media(max-width:380px){.hero-grid{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{.sp-header,.sp-footer{display:none}}