:root{
  --bg:#0b0d1a;--bg2:#0f1230;--card:rgba(255,255,255,.06);--card-strong:rgba(255,255,255,.12);
  --text:#e8ecf1;--muted:#a6b0c2;--accent1:#8b5cf6;--accent2:#22d3ee;--accent3:#f472b6;
  --success:#10b981;--warning:#f59e0b;--error:#ef4444;
  --shadow:0 10px 30px rgba(0,0,0,.35);--radius-xl:24px;--radius:16px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,"Helvetica Neue",Arial,sans-serif;
  color:var(--text);line-height:1.6;
  background:radial-gradient(1200px 800px at 20% -10%,#1a1445 0%,transparent 50%),
             radial-gradient(900px 600px at 100% 10%,#061133 0%,transparent 55%),
             linear-gradient(180deg,var(--bg) 0%,var(--bg2) 100%);
  background-attachment:fixed;min-height:100vh;overflow-x:hidden;
}
a{color:var(--accent2);text-decoration:none;transition:color .2s}
a:hover{color:#fff;text-decoration:underline}
img{max-width:100%;display:block}
.container{width:min(1200px,92vw);margin:0 auto;padding:0 1rem}
.muted{color:var(--muted)}

/* Nav */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:saturate(160%) blur(10px);
  background:linear-gradient(180deg,rgba(11,13,26,.92),rgba(11,13,26,.7));
  border-bottom:1px solid rgba(255,255,255,.06)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0;gap:10px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:.3px;color:var(--text);text-decoration:none}
.logo:hover{color:var(--text);text-decoration:none}
.logo svg{width:28px;height:28px;flex-shrink:0}
.nav-links{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.nav-link{padding:8px 14px;border-radius:999px;font-size:14px;font-weight:500;color:var(--muted);
  border:1px solid transparent;transition:.2s}
.nav-link:hover{color:var(--text);background:rgba(255,255,255,.06);text-decoration:none}
.nav-link.active{color:var(--text);background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.12)}
.burger{display:none;background:none;border:none;color:var(--text);font-size:24px;cursor:pointer;padding:6px}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border-radius:999px;
  border:1px solid transparent;font-weight:600;font-size:15px;transition:.25s;cursor:pointer;text-decoration:none}
.btn:hover{text-decoration:none}
.btn-primary{background:linear-gradient(135deg,var(--accent1),var(--accent2));color:#0b0d1a;
  box-shadow:0 8px 20px rgba(34,211,238,.2)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 28px rgba(34,211,238,.3);color:#0b0d1a}
.btn-ghost{border-color:rgba(255,255,255,.18);background:rgba(255,255,255,.04);color:var(--text)}
.btn-ghost:hover{border-color:rgba(255,255,255,.32);background:rgba(255,255,255,.07);color:var(--text)}

/* Main content */
.main-content{padding:32px 1rem 60px}

/* Breadcrumbs */
.breadcrumbs{font-size:14px;color:var(--muted);margin-bottom:24px}
.breadcrumbs a{color:var(--accent2)}
.bc-current{color:var(--text)}

/* Cards */
.card{background:var(--card);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius);padding:24px}

/* Section headings */
h1{font-size:clamp(28px,4.5vw,48px);line-height:1.15;font-weight:900;margin-bottom:16px}
h2{font-size:clamp(22px,3.5vw,32px);line-height:1.2;font-weight:700;margin:40px 0 12px}
h3{font-size:clamp(18px,2.5vw,24px);font-weight:600;margin:24px 0 8px}
.lead{font-size:18px;color:var(--muted);margin-bottom:24px}

/* Grids */
.grid{display:grid;gap:18px}
.cols-2{grid-template-columns:repeat(2,1fr)}
.cols-3{grid-template-columns:repeat(3,1fr)}
.cols-4{grid-template-columns:repeat(4,1fr)}

/* Article content */
.article-body{max-width:800px}
.article-body p{margin:12px 0;line-height:1.7}
.article-body ul,.article-body ol{margin:12px 0 12px 24px}
.article-body li{margin:6px 0}

/* FAQ blocks */
details{background:var(--card);border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:14px 16px;margin:8px 0}
summary{cursor:pointer;font-weight:600;list-style:none}
summary::-webkit-details-marker{display:none}
summary::before{content:"▸ ";color:var(--accent2)}
details[open] summary::before{content:"▾ "}
details div{margin-top:10px;color:var(--muted)}

/* Related articles */
.related-block{margin-top:48px;padding-top:24px;border-top:1px solid rgba(255,255,255,.1)}
.related-list{display:grid;gap:12px;margin-top:16px}
.related-list a{display:block;padding:16px;background:var(--card);border:1px solid rgba(255,255,255,.08);
  border-radius:12px;color:var(--text);transition:.2s}
.related-list a:hover{background:var(--card-strong);text-decoration:none;border-color:rgba(255,255,255,.18)}

/* CTA block */
.cta-block{margin:40px 0;padding:32px;background:linear-gradient(135deg,rgba(139,92,246,.12),rgba(34,211,238,.08));
  border:1px solid rgba(139,92,246,.2);border-radius:var(--radius);text-align:center}
.cta-block h3{margin-top:0}

/* Article cards list */
.article-card{background:var(--card);border:1px solid rgba(255,255,255,.08);border-radius:var(--radius);
  padding:20px;transition:.2s}
.article-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.3);border-color:rgba(255,255,255,.16)}
.article-card h3{margin:0 0 8px}
.article-card p{color:var(--muted);font-size:14px;margin:0}

/* Footer */
footer{padding:48px 0 40px;color:var(--muted);border-top:1px solid rgba(255,255,255,.06);margin-top:60px}
.footer-cols{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:24px}
.footer-links{list-style:none;padding:0;margin:8px 0 0}
.footer-links li{margin:6px 0}
.footer-links a{color:var(--muted);font-size:14px}
.footer-links a:hover{color:var(--text)}
.footer-bottom{margin-top:24px;padding-top:16px;border-top:1px solid rgba(255,255,255,.06);font-size:12px}

/* Hero (home page) */
.hero{padding:72px 0 40px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:center}
.headline{font-size:clamp(32px,5vw,56px);line-height:1.05;font-weight:900;letter-spacing:.3px;margin:0 0 16px}
.headline .grad{background:linear-gradient(92deg,var(--accent2),var(--accent3) 50%,var(--accent1));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.subhead{font-size:clamp(16px,2.2vw,20px);color:var(--muted);margin:0 0 24px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:24px}
.stat{background:var(--card);border:1px solid rgba(255,255,255,.08);border-radius:16px;padding:14px;text-align:center}
.stat strong{font-size:20px}
.badges{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}
.badge{padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);font-size:12px;color:var(--muted)}

/* Visual (home) */
.visual{position:relative;aspect-ratio:1;border-radius:var(--radius-xl);
  background:radial-gradient(120% 100% at 50% 0%,rgba(139,92,246,.18),rgba(34,211,238,.08) 40%,rgba(255,255,255,.03) 70%);
  border:1px solid rgba(255,255,255,.12);box-shadow:var(--shadow);overflow:hidden;perspective:1000px;transform-style:preserve-3d}
.ring{position:absolute;inset:10% 10%;border-radius:50%;border:1px dashed rgba(255,255,255,.14);animation:spin 30s linear infinite}
.ring:nth-child(2){inset:20% 20%;animation-duration:24s}
.ring:nth-child(3){inset:30% 30%;animation-duration:18s}
@keyframes spin{to{transform:rotate(360deg)}}
.orb{position:absolute;width:12px;height:12px;border-radius:50%;background:linear-gradient(135deg,var(--accent2),#fff);box-shadow:0 0 14px rgba(34,211,238,.6)}
.orb.one{top:14%;left:12%;animation:float1 10s ease-in-out infinite}
.orb.two{bottom:16%;right:14%;animation:float2 12s ease-in-out infinite}
@keyframes float1{0%,100%{transform:translate(0,0)}50%{transform:translate(18px,10px)}}
@keyframes float2{0%,100%{transform:translate(0,0)}50%{transform:translate(-12px,-16px)}}
.visual .viz{position:absolute;inset:0;pointer-events:none;mix-blend-mode:screen}
.visual::before{content:"";position:absolute;inset:-2px;border-radius:var(--radius-xl);
  background:radial-gradient(80% 60% at 50% 0%,rgba(139,92,246,.18),transparent 70%);filter:blur(10px)}

/* Sticky CTA */
.cta-bar{position:sticky;bottom:10px;z-index:40;display:flex;justify-content:center;pointer-events:none}
.cta-wrap{pointer-events:auto;background:linear-gradient(180deg,rgba(255,255,255,.14),rgba(255,255,255,.08));
  backdrop-filter:blur(8px) saturate(140%);border:1px solid rgba(255,255,255,.25);border-radius:999px;
  padding:10px;display:flex;gap:10px;box-shadow:0 12px 30px rgba(0,0,0,.35)}

/* Stars canvas */
#stars{position:fixed;inset:0;z-index:-1}

/* Sections (home) */
section{padding:56px 0}
section .container h2{font-size:clamp(28px,4vw,40px);margin:0 0 16px}
p.lead{font-size:18px;color:var(--muted);margin:0 0 20px}
.icon{width:28px;height:28px;display:inline-flex;align-items:center;justify-content:center;
  border-radius:10px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);margin-bottom:10px}
.card::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,.03),transparent);
  transform:translateX(-100%);animation:shine 7s ease-in-out infinite;pointer-events:none}
@keyframes shine{0%{transform:translateX(-100%)}20%{transform:translateX(100%)}100%{transform:translateX(100%)}}

/* Reveal */
.reveal{opacity:0;transform:translateY(12px);transition:.6s ease}
.reveal.in{opacity:1;transform:none}

/* Reduce motion */
@media(prefers-reduced-motion:reduce){.ring,.orb,.btn-primary{animation:none!important}.reveal{opacity:1;transform:none}}

/* Contact form */
.contact-block{max-width:500px}
.contact-block .btn{margin-top:12px}

/* Responsive */
@media(max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:24px}
  .cols-3{grid-template-columns:1fr 1fr}
  .cols-4{grid-template-columns:1fr 1fr}
  .footer-cols{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .cols-3,.cols-2,.cols-4{grid-template-columns:1fr}
  .hero{padding-top:56px}
  .footer-cols{grid-template-columns:1fr}
  .nav-links{display:none;position:absolute;top:100%;left:0;right:0;background:rgba(11,13,26,.95);
    padding:16px;flex-direction:column;border-bottom:1px solid rgba(255,255,255,.1)}
  .nav-links.open{display:flex}
  .burger{display:block}
}

/* TOC */
.toc{background:var(--card);border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:16px 20px;margin:16px 0 24px}
.toc-title{font-weight:600;margin-bottom:8px}
.toc ul{list-style:none;padding-left:0}
.toc li{margin:6px 0}
.toc a{color:var(--accent2);font-size:14px}