:root{color-scheme:dark;--bg:#050c1a;--card:#0b172c;--card2:#0f1f3a;--line:rgba(140,180,240,.12);--line2:rgba(140,180,240,.24);--blue:#1f6fd1;--signal:#3d9bff;--sky:#9fd0ff;--green:#3ddc84;--text:#eaf1fb;--muted:#8fa3bf}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Montserrat',system-ui,-apple-system,'Segoe UI',sans-serif;background:var(--bg);color:var(--text);font-size:16.5px;line-height:1.65;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
:focus-visible{outline:2px solid var(--signal);outline-offset:3px;border-radius:6px}
.wrap{width:min(1100px,100% - 40px);margin:0 auto}
.hd{position:sticky;top:0;z-index:20;background:rgba(5,12,26,.94);border-bottom:1px solid var(--line)}
.hd-in{display:flex;align-items:center;gap:18px;height:70px}
.logo img{width:100px}
.nav{display:flex;gap:4px;margin-left:12px}
.nav a{padding:8px 12px;border-radius:9px;font-size:14px;font-weight:600;color:#c7d5e8}
.nav a:hover,.nav a[aria-current]{color:#fff;background:rgba(61,155,255,.12)}
.hd-r{margin-left:auto;display:flex;align-items:center;gap:10px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border-radius:12px;font-weight:600;font-size:15px;transition:transform .25s,background .25s}
.btn:hover{transform:translateY(-2px)}
.btn-f{color:#fff;background:linear-gradient(90deg,var(--blue),var(--signal));box-shadow:0 14px 36px -14px rgba(61,155,255,.9)}
.btn-o{color:var(--sky);box-shadow:inset 0 0 0 1px var(--line2);background:rgba(8,18,36,.85)}
.btn svg{width:18px;height:18px}
.lang{position:relative}
.lang summary{list-style:none;cursor:pointer;padding:9px 12px;border-radius:10px;font-size:13px;font-weight:700;color:#fff;background:rgba(31,111,209,.9)}
.lang summary::-webkit-details-marker{display:none}
.lang ul{position:absolute;right:0;top:calc(100% + 6px);list-style:none;min-width:160px;padding:6px;border-radius:12px;background:#0b172c;box-shadow:inset 0 0 0 1px var(--line2),0 20px 40px -20px #000}
.lang li a{display:block;padding:8px 12px;border-radius:8px;font-size:14px;color:#c7d5e8}
.lang li a:hover,.lang li a[aria-current]{background:rgba(61,155,255,.14);color:#fff}
.crumbs{display:flex;flex-wrap:wrap;gap:6px;font-size:13.5px;color:var(--muted);padding:26px 0 0}
.crumbs a{color:var(--sky)}
.crumbs span[aria-hidden]{opacity:.5}
.page{padding:18px 0 70px}
h1{font-weight:600;font-size:clamp(30px,4.4vw,52px);line-height:1.1;letter-spacing:-.02em;text-wrap:balance;max-width:22ch}
.lead{color:#c7d5e8;font-size:18px;max-width:62ch;margin-top:16px}
.acts{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
h2{font-weight:600;font-size:clamp(23px,2.6vw,31px);line-height:1.2;letter-spacing:-.01em;margin:0 0 14px;text-wrap:balance}
section{margin-top:56px}
p+p{margin-top:12px}
.prose p,.prose li{color:#c7d5e8;max-width:68ch}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-top:6px}
.fact{padding:18px 20px;border-radius:16px;background:linear-gradient(180deg,var(--card2),var(--card));box-shadow:inset 0 0 0 1px var(--line);min-width:0}
.fact small{display:block;font-size:12.5px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.fact b{display:block;margin-top:6px;font-weight:600;font-size:16px}
.fact .st{display:inline-flex;align-items:center;gap:8px}
.dot{width:9px;height:9px;border-radius:50%;background:var(--green);box-shadow:0 0 10px rgba(61,220,132,.7);flex:none}
.dot.o{box-shadow:none}.dot.c{background:#e8b84a;box-shadow:none}
.bot{display:inline-flex;align-items:center;gap:8px}
.bot img{width:22px;height:22px;border-radius:50%}
.tip{margin-top:18px;padding:18px 20px;border-radius:14px;background:rgba(31,111,209,.12);box-shadow:inset 0 0 0 1px rgba(61,155,255,.25)}
.tip b{display:block;color:var(--sky);font-size:13px;letter-spacing:.06em;text-transform:uppercase;margin-bottom:4px}
.steps{list-style:none;counter-reset:s;display:grid;gap:10px;max-width:760px}
.steps li{counter-increment:s;display:flex;gap:14px;align-items:flex-start;padding:16px 18px;border-radius:14px;background:var(--card);box-shadow:inset 0 0 0 1px var(--line);color:#c7d5e8}
.steps li::before{content:counter(s);flex:none;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;font-weight:700;font-size:14px;color:#fff;background:linear-gradient(90deg,var(--blue),var(--signal))}
.faq{display:grid;gap:10px;max-width:820px}
.faq details{border-radius:14px;background:var(--card);box-shadow:inset 0 0 0 1px var(--line)}
.faq summary{cursor:pointer;list-style:none;padding:17px 20px;font-weight:600;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--sky);font-weight:700}
.faq details[open] summary::after{content:"–"}
.faq p{padding:0 20px 18px;color:#c7d5e8}
.cta{margin-top:64px;padding:34px;border-radius:24px;background:linear-gradient(160deg,#133f80,#081a36 75%);box-shadow:inset 0 0 0 1px rgba(61,155,255,.35)}
.cta p{color:#c7d5e8;max-width:56ch}
.links{display:flex;flex-wrap:wrap;gap:8px}
.links a{padding:8px 13px;border-radius:10px;font-size:14px;font-weight:600;background:var(--card);box-shadow:inset 0 0 0 1px var(--line);color:#c7d5e8}
.links a:hover{color:#fff;box-shadow:inset 0 0 0 1px rgba(61,155,255,.45)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.card{display:block;padding:18px 20px;border-radius:16px;background:linear-gradient(180deg,var(--card2),var(--card));box-shadow:inset 0 0 0 1px var(--line);transition:box-shadow .3s,transform .3s;min-width:0}
a.card:hover{transform:translateY(-3px);box-shadow:inset 0 0 0 1px rgba(61,155,255,.45),0 24px 40px -26px rgba(31,111,209,.7)}
.card b{display:block;font-size:17px}
.card small{display:flex;align-items:center;gap:8px;margin-top:6px;color:var(--muted);font-size:13.5px}
.card .langs{margin-top:8px;font-size:12.5px;color:var(--sky)}
.all{columns:4 200px;column-gap:24px}
.all li{list-style:none;display:flex;align-items:center;gap:8px;padding:4px 0;font-size:14.5px;color:#c7d5e8;break-inside:avoid}
.ft{border-top:1px solid var(--line);padding:30px 0 40px;color:var(--muted);font-size:13.5px}
.ft .wrap{display:flex;gap:24px;align-items:flex-start;flex-wrap:wrap}
.ft img{width:84px}
.ft p{flex:1 1 320px;max-width:70ch}
.hint{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);z-index:30;display:flex;align-items:center;gap:12px;padding:12px 14px 12px 18px;border-radius:14px;background:#0f1f3a;box-shadow:inset 0 0 0 1px var(--line2),0 20px 40px -18px #000;font-size:14.5px;width:max-content;max-width:calc(100% - 32px)}
.hint a{font-weight:700;color:#fff;padding:7px 12px;border-radius:9px;background:var(--blue)}
.hint button{background:none;border:0;color:var(--muted);font-size:20px;line-height:1;cursor:pointer;padding:2px 6px}
.toc{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.term{padding:22px 0;border-top:1px solid var(--line)}
.term h2{font-size:22px;margin:0}
.term .also{margin-top:10px;font-size:14px;color:var(--muted)}
.term .also a{color:var(--sky)}
.figure{margin-top:26px;border-radius:20px;overflow:hidden;box-shadow:inset 0 0 0 1px var(--line);background:var(--card)}
@media (max-width:760px){
 .nav{display:none}
 .hd-r .btn{display:none}
 .lead{font-size:16.5px}
 .cta{padding:24px}
 .all{columns:2 140px}
}