:root{
  --bg:#06131f;--paper:#0d1e2d;--ink:#eef3f6;--ink-soft:#a9bac7;--ink-faint:#7d8f9d;
  --rule:rgba(195,219,235,.14);--rule-strong:rgba(195,219,235,.28);
  --accent:#65d4e8;--navy:#5b7cff;
  --l3:#6fe0a8;--l3bg:rgba(111,224,168,.13);
  --l2:#f0c674;--l2bg:rgba(240,198,116,.13);
  --l1:#f2a072;--l1bg:rgba(242,160,114,.13);
  --l0:#a8b8c4;--l0bg:rgba(168,184,196,.13);
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
  --sans:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;
}
*{box-sizing:border-box}
[id]{scroll-margin-top:100px}
@media (max-width:900px){[id]{scroll-margin-top:84px}}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;background:var(--bg)}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);
  font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased}
::selection{background:rgba(101,212,232,.28)}
.wrap{max-width:1180px;margin:0 auto;padding:0 22px}
a{color:var(--accent)}
img,svg{max-width:100%}

/* ---------- banner ---------- */
.banner{background:#04101a;color:#9eafb8;border-bottom:1px solid rgba(255,255,255,.07);
  font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;
  padding:0;text-align:left;position:relative;z-index:60}
.banner-inner{min-height:32px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.banner-inner span:first-child{display:flex;align-items:center;gap:9px;color:#dbe5e8}
.banner-inner i{width:6px;height:6px;border-radius:50%;background:var(--accent);
  box-shadow:0 0 0 5px rgba(101,212,232,.1);flex:0 0 6px}

/* ---------- sticky top bar ---------- */
.b-topbar{position:sticky;top:0;z-index:50;background:rgba(6,19,31,.82);
  border-bottom:1px solid transparent;backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  transition:background .25s ease,border-color .25s ease}
.b-topbar.is-stuck{background:rgba(6,19,31,.96);border-bottom-color:var(--rule)}
.b-bar{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:82px}
.b-lockup{display:inline-flex;align-items:center;gap:14px;text-decoration:none;color:inherit}
.b-lockup svg{width:50px;height:50px;flex:0 0 50px;display:block}
.b-word{display:block;font-size:22px;font-weight:670;letter-spacing:.28em;line-height:1;color:#fff}
.b-desc{display:block;margin-top:4px;color:var(--ink-faint);font-family:var(--mono);
  font-size:9.5px;font-weight:600;letter-spacing:.22em;text-transform:uppercase}
.b-nav{display:flex;align-items:center;gap:clamp(14px,2.2vw,32px);font-size:13px;color:#c8d2d9}
.b-nav a{text-decoration:none;color:inherit;padding:10px 0;position:relative}
.b-nav a:not(.b-cta)::after{content:"";position:absolute;left:0;right:0;bottom:4px;height:1px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .18s ease}
.b-nav a:not(.b-cta):hover{color:#fff}
.b-nav a:not(.b-cta):hover::after,.b-nav a[aria-current=page]::after{transform:scaleX(1)}
.b-nav a[aria-current=page]{color:#fff}
.b-cta{display:inline-flex;align-items:center;gap:11px;min-height:42px;padding:0 16px;
  border:1px solid var(--rule-strong);border-radius:0;background:transparent;
  font-size:12px;font-weight:700;color:var(--ink);
  transition:background .2s ease,color .2s ease,border-color .2s ease}
.b-cta svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.5;display:block}
.b-cta:hover{background:var(--ink);color:var(--bg);border-color:var(--ink)}

/* ---------- page head ---------- */
.p-head{position:relative;overflow:hidden;border-bottom:1px solid var(--rule);
  background:radial-gradient(circle at 78% 26%,rgba(91,124,255,.15),transparent 32%),
             radial-gradient(circle at 62% 82%,rgba(101,212,232,.07),transparent 28%),
             linear-gradient(135deg,#04101a,#06131f 52%,#071a29)}
.p-head::before{content:"";position:absolute;inset:0;pointer-events:none;opacity:.28;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:linear-gradient(to left,#000,rgba(0,0,0,.7) 55%,transparent 92%);
  mask-image:linear-gradient(to left,#000,rgba(0,0,0,.7) 55%,transparent 92%)}
.p-head .wrap{position:relative;z-index:1;padding-top:34px;padding-bottom:44px}
.crumbs{font-family:var(--mono);font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;
  color:var(--ink-faint);margin-bottom:22px}
.crumbs a{color:var(--ink-faint);text-decoration:none}
.crumbs a:hover{color:var(--accent)}
.crumbs span{margin:0 9px;opacity:.55}
.kicker{display:inline-flex;align-items:center;gap:12px;margin-bottom:18px;font-family:var(--mono);
  font-size:10.5px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;color:#b9c5cd}
.kicker::before{content:"";width:34px;height:1px;background:linear-gradient(90deg,var(--navy),var(--accent))}
h1{margin:0;font-size:clamp(30px,3.9vw,52px);font-weight:620;letter-spacing:-.032em;
  line-height:1.06;color:#fff;max-width:22ch}
.p-head p.lead{max-width:62ch;margin:22px 0 0;color:var(--ink-soft);
  font-size:clamp(15.5px,1.35vw,18px);line-height:1.6}
.p-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px 22px;margin-top:26px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.11em;text-transform:uppercase;
  color:var(--ink-faint)}
.badge{font-family:var(--mono);font-size:10.5px;font-weight:600;letter-spacing:.07em;
  padding:4px 9px;white-space:nowrap;text-transform:none}
.t-L3{background:var(--l3bg);color:var(--l3)}
.t-L2{background:var(--l2bg);color:var(--l2)}
.t-L1{background:var(--l1bg);color:var(--l1)}
.t-L0{background:var(--l0bg);color:var(--l0)}

/* ---------- article layout ---------- */
.a-shell{display:grid;grid-template-columns:minmax(0,1fr) 268px;gap:clamp(32px,5vw,64px);
  padding:48px 22px 20px;align-items:start}
.a-body{max-width:70ch;font-size:16px;line-height:1.68;color:var(--ink-soft)}
.a-body>p:first-child{font-size:18.5px;line-height:1.6;color:var(--ink)}
.a-body h2{margin:46px 0 14px;font-size:clamp(20px,2vw,25px);font-weight:620;
  letter-spacing:-.02em;line-height:1.2;color:#fff}
.a-body p{margin:0 0 17px}
.a-body strong{color:var(--ink);font-weight:640}
.a-body a{color:var(--accent);text-decoration:none;
  border-bottom:1px solid rgba(101,212,232,.3);transition:border-color .15s ease}
.a-body a:hover{border-bottom-color:var(--accent)}
.a-body ul,.a-body ol{margin:0 0 18px;padding-left:22px}
.a-body li{margin-bottom:9px}
.a-body ul li::marker{color:var(--accent)}
.a-body hr{border:0;border-top:1px solid var(--rule);margin:40px 0 26px}

.a-tablewrap{overflow-x:auto;margin:0 0 22px;border:1px solid var(--rule);background:var(--paper)}
.a-body table{border-collapse:collapse;width:100%;font-size:14px}
.a-body th,.a-body td{padding:11px 15px;text-align:left;border-bottom:1px solid var(--rule)}
.a-body th{font-family:var(--mono);font-size:10.5px;letter-spacing:.11em;text-transform:uppercase;
  color:var(--ink-faint);font-weight:600;background:rgba(255,255,255,.025)}
.a-body td{color:var(--ink)}
.a-body tbody tr:last-child td{border-bottom:0}

.a-faq{border-left:2px solid var(--rule-strong);padding:2px 0 2px 18px;margin:0 0 22px}
.a-faq .a-q{margin:0 0 7px;color:#fff;font-weight:620;font-size:16px;line-height:1.4}
.a-faq .a-a{margin:0;font-size:15px}
.a-body ol.a-src{counter-reset:s;list-style:none;padding-left:0;font-size:14px}
.a-body ol.a-src li{counter-increment:s;position:relative;padding-left:32px;margin-bottom:11px;
  line-height:1.5;word-break:break-word}
.a-body ol.a-src li::before{content:counter(s);position:absolute;left:0;top:1px;
  font-family:var(--mono);font-size:10.5px;color:var(--ink-faint);
  border:1px solid var(--rule);min-width:21px;height:21px;display:grid;place-items:center}
.a-disclaimer{font-size:12.5px;line-height:1.7;color:var(--ink-faint);
  border:1px solid var(--rule);background:var(--paper);padding:16px 18px;margin:0}

/* ---------- sidebar ---------- */
.a-side{position:sticky;top:110px;font-size:13px}
.a-side h3{margin:0 0 12px;font-family:var(--mono);font-size:10px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--ink-faint);font-weight:600}
.a-toc{list-style:none;margin:0 0 34px;padding:0;border-left:1px solid var(--rule)}
.a-toc li{margin:0}
.a-toc a{display:block;padding:6px 0 6px 14px;margin-left:-1px;color:var(--ink-faint);
  text-decoration:none;border-left:1px solid transparent;line-height:1.4;
  transition:color .15s ease,border-color .15s ease}
.a-toc a:hover{color:var(--ink)}
.a-toc a[aria-current]{color:var(--accent);border-left-color:var(--accent)}
.a-rel{list-style:none;margin:0;padding:0}
.a-rel li{margin-bottom:11px}
.a-rel a{color:var(--ink-soft);text-decoration:none;line-height:1.4;display:block}
.a-rel a:hover{color:var(--accent)}
.a-rel .k{display:block;font-family:var(--mono);font-size:9px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink-faint);margin-bottom:2px}

/* ---------- cards ---------- */
.grid{display:grid;gap:1px;background:var(--rule);border:1px solid var(--rule);margin:0 0 44px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.card{background:var(--bg);padding:24px 22px;text-decoration:none;color:inherit;display:block;
  transition:background .18s ease}
.card:hover{background:var(--paper)}
.card .k{font-family:var(--mono);font-size:9.5px;letter-spacing:.15em;text-transform:uppercase;
  color:var(--ink-faint);display:flex;align-items:center;gap:10px;margin-bottom:12px}
.card h3{margin:0 0 9px;font-size:17px;font-weight:620;letter-spacing:-.015em;
  line-height:1.3;color:#fff}
.card:hover h3{color:var(--accent)}
.card p{margin:0;font-size:13.5px;line-height:1.55;color:var(--ink-soft)}

.sec{padding:52px 0 0}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:24px;
  padding-bottom:16px;margin-bottom:26px;border-bottom:1px solid var(--rule-strong)}
.sec-head h2{margin:0;font-size:clamp(21px,2.2vw,28px);font-weight:620;letter-spacing:-.025em;color:#fff}
.sec-head p{margin:0;font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--ink-faint);white-space:nowrap}
.sec>p.intro{max-width:66ch;color:var(--ink-soft);font-size:15.5px;line-height:1.65;margin:0 0 30px}

.next{border-top:1px solid var(--rule-strong);margin-top:52px;padding-top:34px}
.next h2{margin:0 0 22px;font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--ink-faint);font-weight:600}

.cta-strip{margin:56px 0 0;border:1px solid var(--rule);background:var(--paper);
  padding:30px 28px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:22px}
.cta-strip h2{margin:0 0 6px;font-size:20px;font-weight:620;letter-spacing:-.02em;color:#fff}
.cta-strip p{margin:0;color:var(--ink-soft);font-size:14px;max-width:56ch}
.btn{display:inline-flex;align-items:center;gap:10px;min-height:48px;padding:0 22px;
  border-radius:999px;text-decoration:none;font-size:14.5px;font-weight:620;
  background:linear-gradient(92deg,#5b7cff,#65d4e8);color:#04101a;
  transition:transform .18s ease;white-space:nowrap}
.btn:hover{transform:translateY(-2px)}

/* ---------- footer ---------- */
footer{margin-top:56px;padding:65px 0 35px;background:#04101a;border-top:0;
  font-family:var(--sans);font-size:12px;color:var(--ink-faint);line-height:1.6}
.f-top{display:flex;align-items:center;justify-content:space-between;gap:40px;
  padding-bottom:55px;border-bottom:1px solid var(--rule)}
.f-links{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:28px}
.f-links a{color:#9aabb2;font-size:12px;text-decoration:none}
.f-links a:hover{color:var(--ink)}
.f-bottom{display:flex;align-items:flex-start;justify-content:space-between;gap:40px;padding-top:28px}
.f-bottom p{max-width:820px;margin:0;color:#6f828b;font-size:10px;line-height:1.7}
.f-bottom span{color:#6f828b;font-family:var(--mono);font-size:9px;letter-spacing:.06em;
  text-transform:uppercase;white-space:nowrap}

/* ---------- responsive ---------- */
@media (max-width:1080px){.b-nav{gap:18px}.b-nav a:not(.b-cta){font-size:12px}}
@media (max-width:980px){
  .a-shell{grid-template-columns:1fr;gap:0}
  .a-side{position:static;margin-top:44px;padding-top:30px;border-top:1px solid var(--rule)}
  .a-toc{margin-bottom:30px}
  .grid-3{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:940px){.b-nav a:not(.b-cta){display:none}}
@media (max-width:760px){
  .banner-note{display:none}.banner-inner{min-height:28px}
  .grid-2,.grid-3{grid-template-columns:1fr}
  .p-head .wrap{padding-top:26px;padding-bottom:34px}
  .a-shell{padding-top:36px}
  .a-body{font-size:15.5px}
  .f-top,.f-bottom{flex-direction:column;align-items:flex-start;gap:24px}
  .f-links{justify-content:flex-start;gap:20px}.f-bottom span{white-space:normal}
  .f-top{padding-bottom:34px}
  .cta-strip{padding:24px 20px}
}
@media (max-width:560px){
  .b-bar{min-height:76px}
  .b-lockup svg{width:42px;height:42px;flex-basis:42px}
  .b-word{font-size:18px;letter-spacing:.22em}
  .b-desc{font-size:8.5px;letter-spacing:.16em}
  .sec-head{flex-direction:column;gap:8px}
  .sec-head p{white-space:normal}
}