*{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#070a0f;
  --bg2:#0b1018;
  --panel:#111724;
  --panel2:#161d2b;
  --line:#263045;
  --line2:#344057;
  --text:#f3f6fb;
  --muted:#a8b2c4;
  --dim:#69758b;
  --amber:#ffb703;
  --orange:#fb8500;
  --cyan:#27c7e8;
  --green:#19d49b;
  --red:#ef476f;
}
html{scroll-behavior:smooth}
body{
  min-height:100vh;
  overflow-x:hidden;
  background:
    linear-gradient(180deg,rgba(7,10,15,.98),rgba(8,11,16,1) 60%,rgba(7,10,15,1)),
    var(--bg);
  color:var(--text);
  font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  letter-spacing:0;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  background:
    linear-gradient(90deg,rgba(148,163,184,.052) 1px,transparent 1px),
    linear-gradient(180deg,rgba(148,163,184,.04) 1px,transparent 1px);
  background-size:88px 88px;
  opacity:.45;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
.brand-copy strong,.nav-link,.btn,.eyebrow,h1,h2,h3,.card-title,.article h2,.article h3{
  font-family:Sora,Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  height:76px;
  border-bottom:1px solid rgba(148,163,184,.18);
  background:rgba(8,11,16,.9);
  backdrop-filter:blur(16px);
}
.header-inner{
  width:min(1120px,100%);
  height:100%;
  margin:0 auto;
  padding:0 22px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand-mark{
  width:48px;height:48px;border-radius:14px;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--amber),var(--orange));
  box-shadow:0 12px 26px rgba(255,183,3,.22);
  flex:0 0 auto;
}
.brand-copy strong{display:block;font-size:20px;line-height:1;font-weight:900}
.brand-copy span{display:block;margin-top:4px;color:var(--muted);font-size:12px;line-height:1;font-weight:800}
.header-actions{display:flex;align-items:center;gap:10px}
.nav-link{
  min-height:42px;display:inline-flex;align-items:center;justify-content:center;
  border-radius:8px;padding:0 12px;color:var(--muted);font-size:14px;font-weight:850;
}
.nav-link:hover{color:var(--text);background:rgba(255,255,255,.04)}
.btn{
  min-height:46px;display:inline-flex;align-items:center;justify-content:center;
  border-radius:8px;padding:0 18px;border:1px solid rgba(255,183,3,.42);
  font-size:15px;font-weight:900;text-align:center;
}
.btn.primary{color:#070a0f;background:linear-gradient(135deg,var(--amber),var(--orange));box-shadow:0 14px 34px rgba(255,183,3,.18)}
.btn.secondary{color:var(--amber);background:rgba(17,23,36,.66)}
.wrap{position:relative;z-index:1;width:min(1120px,100%);margin:0 auto;padding:0 22px}
.hero{
  position:relative;z-index:1;padding:86px 0 54px;border-bottom:1px solid rgba(148,163,184,.14);
}
.eyebrow{color:var(--amber);font-size:13px;text-transform:uppercase;font-weight:900;margin-bottom:14px}
h1{font-size:clamp(38px,7vw,72px);line-height:.98;font-weight:900;max-width:880px}
.lead{margin-top:22px;color:#d8dee9;font-size:clamp(18px,2.4vw,23px);line-height:1.5;max-width:820px;font-weight:700}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.section{position:relative;z-index:1;padding:56px 0}
.section.alt{background:rgba(255,255,255,.018);border-top:1px solid rgba(148,163,184,.12);border-bottom:1px solid rgba(148,163,184,.12)}
.section-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,.7fr);gap:26px;align-items:end;margin-bottom:28px}
.section-head h2{font-size:clamp(28px,4vw,46px);line-height:1.05}
.section-note{color:var(--muted);font-size:16px;line-height:1.7;font-weight:650}
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.card{
  position:relative;
  min-height:220px;border:1px solid rgba(148,163,184,.18);border-radius:8px;
  background:linear-gradient(180deg,rgba(17,23,36,.94),rgba(12,16,24,.96));
  padding:22px;display:flex;flex-direction:column;gap:12px;
  cursor:pointer;
  transition:border-color .18s ease,transform .18s ease,background .18s ease;
}
.card:hover{border-color:rgba(255,183,3,.44);transform:translateY(-2px);background:linear-gradient(180deg,rgba(19,27,42,.96),rgba(12,16,24,.98))}
.card-kicker{color:var(--amber);font-size:11px;text-transform:uppercase;font-weight:900;letter-spacing:.04em}
.card-title{font-size:21px;line-height:1.15;font-weight:900}
.card p{color:var(--muted);font-size:14px;line-height:1.6;font-weight:650}
.card a{margin-top:auto;color:var(--amber);font-weight:900}
.card a::after{content:"";position:absolute;inset:0;border-radius:8px}
.card a:focus-visible{outline:2px solid var(--amber);outline-offset:4px;border-radius:6px}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:34px;align-items:start}
.article-layout>*{min-width:0}
.article{
  min-width:0;
  border:1px solid rgba(148,163,184,.16);border-radius:8px;
  background:rgba(17,23,36,.74);padding:34px;
}
.article p,.article li{color:#d5dbe7;font-size:17px;line-height:1.78;font-weight:600}
.article strong{color:var(--text)}
.article h2{margin:34px 0 14px;font-size:30px;line-height:1.12}
.article h3{margin:24px 0 10px;font-size:22px}
.article ul,.article ol{padding-left:24px;margin:12px 0 0}
.article li+li{margin-top:8px}
.formula,.example,.warning,.ok-box{
  margin:18px 0;border-radius:8px;padding:18px 20px;border:1px solid rgba(148,163,184,.18);
}
.formula{background:rgba(39,199,232,.07);border-color:rgba(39,199,232,.28);font-family:"JetBrains Mono",monospace;color:#dff9ff;font-weight:800}
.example{background:rgba(255,183,3,.08);border-color:rgba(255,183,3,.28)}
.warning{background:rgba(239,71,111,.08);border-color:rgba(239,71,111,.30)}
.ok-box{background:rgba(25,212,155,.07);border-color:rgba(25,212,155,.28)}
.note-title{display:block;margin-bottom:8px;color:var(--text);font-weight:900}
.table-wrap{overflow:auto;margin:18px 0;border:1px solid rgba(148,163,184,.18);border-radius:8px}
table{width:100%;border-collapse:collapse;min-width:560px;background:rgba(10,14,22,.72)}
th,td{padding:12px 14px;border-bottom:1px solid rgba(148,163,184,.14);text-align:left;color:#d5dbe7;font-size:14px;line-height:1.45}
th{color:var(--amber);font-family:Sora,Inter,sans-serif;font-size:12px;text-transform:uppercase;font-weight:900}
tr:last-child td{border-bottom:0}
.quick-nav{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:18px 0}
.quick-nav a{border:1px solid rgba(148,163,184,.16);border-radius:8px;padding:12px;color:var(--muted);font-weight:850;background:rgba(255,255,255,.025)}
.quick-nav a:hover{color:var(--amber);border-color:rgba(255,183,3,.38)}
.faq-list{display:grid;gap:10px;margin:18px 0}
.faq-list details{border:1px solid rgba(148,163,184,.18);border-radius:8px;background:rgba(10,14,22,.62);padding:14px 16px}
.faq-list summary{cursor:pointer;color:var(--text);font-family:Sora,Inter,sans-serif;font-weight:900;line-height:1.4}
.faq-list details[open]{border-color:rgba(255,183,3,.28);background:rgba(255,183,3,.045)}
.faq-list p{margin-top:10px;font-size:15px;line-height:1.7;color:var(--muted)}
.side{
  position:sticky;top:96px;border:1px solid rgba(148,163,184,.16);border-radius:8px;
  background:rgba(10,14,22,.88);padding:18px;
}
.side h2{font-size:18px;line-height:1.2;margin-bottom:12px}
.side a{display:block;color:var(--muted);font-size:14px;font-weight:800;line-height:1.35;padding:10px 0;border-top:1px solid rgba(148,163,184,.12)}
.side a:hover{color:var(--amber)}
.cta{
  margin-top:30px;border:1px solid rgba(255,183,3,.32);border-radius:8px;
  background:linear-gradient(135deg,rgba(255,183,3,.12),rgba(251,133,0,.08));padding:22px;
}
.cta h2{font-size:24px;margin:0 0 10px}
.cta p{font-size:15px;color:var(--muted)}
.refs{margin-top:30px;padding-top:20px;border-top:1px solid rgba(148,163,184,.16)}
.refs p{font-size:14px;color:var(--muted)}
.breadcrumbs{margin:24px 0 0;color:var(--dim);font-size:13px;font-weight:800}
.breadcrumbs a{color:var(--muted)}
.footer{position:relative;z-index:1;border-top:1px solid rgba(148,163,184,.14);padding:24px 0;color:var(--dim);font-size:13px}
.footer-inner{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}
.footer a{color:var(--muted)}
@media(max-width:900px){
  .header-actions .nav-link{display:none}
  .section-head,.article-layout{grid-template-columns:1fr}
  .cards{grid-template-columns:1fr}
  .quick-nav{grid-template-columns:1fr}
  .side{position:static}
  .article{padding:24px 18px}
  .article p,.article li{font-size:16px}
}
@media(max-width:520px){
  .site-header{height:72px}
  .brand-mark{width:44px;height:44px}
  .brand-copy strong{font-size:18px}
  .brand-copy span{font-size:11px}
  .btn{width:100%}
  .header-actions .btn{width:auto;padding:0 14px}
  .hero{padding:58px 0 38px}
  .section{padding:42px 0}
}