:root{
  --bg:#0a0d14;--bg2:#0f1420;--card:#131a29;--card2:#182136;--line:#232d45;
  --tx:#e8ecf5;--mut:#9aa6bf;--acc:#7c9cff;--acc2:#3fd6e6;--warn:#ffb454;--ok:#4ade80;
  --grad:linear-gradient(120deg,#7c9cff 0%,#a78bfa 45%,#3fd6e6 100%);
  --r:18px;--sh:0 10px 40px -15px rgba(0,0,0,.7)
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--tx);font:16px/1.7 Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  background-image:radial-gradient(900px 500px at 85% -10%,rgba(124,156,255,.14),transparent 60%),radial-gradient(700px 500px at -10% 30%,rgba(63,214,230,.08),transparent 60%);background-attachment:fixed}
a{color:var(--acc);text-decoration:none}
a:hover{color:#a9bcff}
img{max-width:100%;height:auto}
h1,h2,h3{line-height:1.2;letter-spacing:-.02em;margin:0 0 .6em}
h1{font-size:clamp(2rem,5vw,3.4rem);font-weight:800}
h2{font-size:clamp(1.35rem,3vw,1.8rem);font-weight:700}
h3{font-size:1.08rem;font-weight:700}
p{margin:0 0 1em}
.wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}
.narrow{max-width:820px}

/* header */
.hdr{position:sticky;top:0;z-index:50;background:rgba(10,13,20,.78);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.hdr-in{display:flex;align-items:center;justify-content:space-between;height:66px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;color:var(--tx);font-weight:700;font-size:1.08rem}
.logo b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.logo-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:var(--grad);color:#0a0d14;font-weight:800;font-size:.9rem}
.nav{display:flex;align-items:center;gap:4px}
.nav a{color:var(--mut);padding:8px 12px;border-radius:10px;font-weight:500;font-size:.95rem}
.nav a:hover{color:var(--tx);background:var(--card)}
.nav .lang{border:1px solid var(--line);color:var(--tx);margin-left:8px}
.burger{display:none;background:none;border:0;padding:8px;cursor:pointer}
.burger span{display:block;width:24px;height:2px;background:var(--tx);margin:5px 0;border-radius:2px;transition:.3s}
@media(max-width:860px){
  .burger{display:block}
  .nav{position:fixed;inset:66px 0 auto 0;flex-direction:column;align-items:stretch;background:var(--bg2);border-bottom:1px solid var(--line);padding:12px 20px 20px;transform:translateY(-130%);transition:transform .3s;gap:2px}
  .nav.open{transform:none}
  .nav a{padding:12px}
  .nav .lang{margin:8px 0 0;text-align:center}
}

/* hero */
.hero{padding:clamp(56px,10vw,110px) 0 50px}
.eyebrow{display:inline-block;color:var(--acc2);font-weight:600;font-size:.82rem;letter-spacing:.12em;text-transform:uppercase;border:1px solid var(--line);padding:5px 12px;border-radius:99px;margin-bottom:22px}
.hero h1 span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{color:var(--mut);font-size:clamp(1.02rem,2vw,1.2rem);max-width:760px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin:28px 0 40px}
.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;max-width:640px}
.stats div{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px}
.stats b{display:block;font-size:1.9rem;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stats span{color:var(--mut);font-size:.88rem}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--grad);color:#0a0d14;font-weight:700;padding:13px 24px;border-radius:12px;transition:transform .2s,box-shadow .2s;box-shadow:0 8px 30px -10px rgba(124,156,255,.6);text-align:center}
.btn:hover{color:#0a0d14;transform:translateY(-2px);box-shadow:0 12px 34px -10px rgba(124,156,255,.8)}
.btn-ghost{background:transparent;color:var(--tx);border:1px solid var(--line);box-shadow:none}
.btn-ghost:hover{color:var(--tx);background:var(--card)}
.btn-sm{padding:10px 16px;font-size:.9rem;width:100%;margin-top:14px}

/* sections & cards */
.sec-h{margin:56px 0 22px}
.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.grid4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
@media(max-width:980px){.grid3,.grid4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.grid3,.grid4,.stats{grid-template-columns:1fr}}
.card{display:block;background:linear-gradient(180deg,var(--card),var(--bg2));border:1px solid var(--line);border-radius:var(--r);padding:22px;color:var(--tx);transition:border-color .25s,transform .25s;position:relative;overflow:hidden}
a.card:hover{border-color:#3a4a74;transform:translateY(-3px);color:var(--tx)}
.card p{color:var(--mut);font-size:.94rem;margin:0}
.num{display:inline-block;font-size:.78rem;font-weight:700;color:var(--acc2);margin-bottom:10px;letter-spacing:.08em}
.more{display:inline-block;margin-top:14px;color:var(--acc);font-weight:600;font-size:.92rem}
.pills{display:flex;flex-wrap:wrap;gap:10px}
.pill{border:1px solid var(--line);background:var(--card);color:var(--tx);padding:9px 16px;border-radius:99px;font-size:.93rem}
.pill:hover{border-color:var(--acc);color:var(--tx)}
.eeat-l{display:grid;place-items:center;width:42px;height:42px;border-radius:12px;background:var(--card2);border:1px solid var(--line);font-weight:800;color:var(--acc);margin-bottom:12px}
.kw-text{background:var(--bg2);border-left:3px solid var(--acc);border-radius:0 12px 12px 0;padding:18px 22px;color:#c9d2e6;margin:34px 0}

/* article */
.art{padding-top:28px;padding-bottom:20px}
.crumbs{font-size:.86rem;color:var(--mut);display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.crumbs a{color:var(--mut)}
.art-hd{max-width:860px;margin-bottom:34px}
.meta{display:flex;flex-wrap:wrap;gap:10px 22px;color:var(--mut);font-size:.88rem;border-top:1px solid var(--line);padding-top:16px;margin-top:20px}
.art-grid{display:grid;grid-template-columns:250px minmax(0,1fr);gap:40px;align-items:start}
.toc{position:sticky;top:90px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px}
.toc ol{margin:12px 0 0;padding-left:20px;color:var(--mut)}
.toc li{margin:6px 0}
.toc a{color:var(--mut);font-size:.93rem}
.toc a:hover{color:var(--tx)}
@media(max-width:900px){.art-grid{grid-template-columns:1fr}.toc{position:static}}
.art-body{max-width:820px;min-width:0}
.art-body section{margin-bottom:30px;scroll-margin-top:90px}
.m-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
@media(max-width:600px){.m-grid{grid-template-columns:1fr}}
.m-card h3{margin-bottom:8px}
.box{border:1px solid var(--line);border-radius:var(--r);padding:22px 24px;background:var(--card)}
.box h2{font-size:1.2rem;margin-bottom:10px}
.box p{color:#c9d2e6}
.box p:last-child{margin:0}
.box-exp{border-color:rgba(124,156,255,.35)}
.box-tip{border-color:rgba(63,214,230,.35);background:linear-gradient(180deg,rgba(63,214,230,.06),var(--card))}
.box-auth{border-color:rgba(167,139,250,.35)}
.box-risk{border-color:rgba(255,180,84,.4);background:linear-gradient(180deg,rgba(255,180,84,.06),var(--card))}
.small{font-size:.86rem;color:var(--mut)!important;margin-top:12px!important}
.cta-band{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;background:linear-gradient(120deg,rgba(124,156,255,.15),rgba(63,214,230,.1));border:1px solid #2d3b60;border-radius:var(--r);padding:22px 24px;margin:30px 0}
.cta-band p{margin:0;flex:1 1 300px;font-weight:500}
.faq{background:var(--card);border:1px solid var(--line);border-radius:14px;margin-bottom:10px;overflow:hidden}
.faq summary{cursor:pointer;padding:16px 20px;font-weight:600;list-style:none;position:relative;padding-right:48px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);color:var(--acc);font-size:1.4rem;transition:.2s}
.faq[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.faq p{padding:0 20px 18px;color:var(--mut);margin:0}
.related{margin-top:60px}
.rel h3{font-size:1rem}

/* footer */
.ftr{border-top:1px solid var(--line);margin-top:80px;padding:50px 0 30px;background:var(--bg2)}
.ftr-top{display:flex;flex-wrap:wrap;align-items:center;gap:16px 30px;margin-bottom:26px}
.ftr-top p{color:var(--mut);margin:0;flex:1 1 300px}
.ftr-links{list-style:none;padding:0;margin:0 0 26px;display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:6px 20px}
.ftr-links a{color:var(--mut);font-size:.88rem}
.ftr-links a:hover{color:var(--tx)}
.ftr-disc,.ftr-copy{color:#6f7a93;font-size:.82rem}

/* chooser / 404 */
.chooser{min-height:100vh;display:grid;place-items:center}
.choose{text-align:center;padding:60px 20px}
.logo.big{justify-content:center;font-size:1.4rem;margin-bottom:30px}
.choose-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;max-width:640px;margin:30px auto 0}
@media(max-width:560px){.choose-grid{grid-template-columns:1fr}}
.choose .hero-cta{justify-content:center}
.big404{font-size:7rem;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;margin:0}

@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}