:root{
  --bg:#040816;
  --bg2:#07102a;
  --card:rgba(9,20,46,.72);
  --card-b:rgba(61,255,143,.22);
  --green:#3dff8f;
  --green-d:#14c46a;
  --blue:#2fa8ff;
  --cyan:#35e6ff;
  --text:#e8f2ff;
  --muted:#8ea6c7;
  --danger:#ff5c7a;
  --radius:18px;
  --glow-g:0 0 22px rgba(61,255,143,.35);
  --glow-b:0 0 22px rgba(47,168,255,.35);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font:16px/1.65 "Segoe UI",system-ui,-apple-system,Roboto,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
a{color:var(--cyan);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
code,.mono{font-family:Consolas,"SF Mono",monospace}

/* language switch: <ru>/<en> */
ru,en{display:inline}
html[data-lang="ru"] en{display:none}
html[data-lang="en"] ru{display:none}
html[data-lang="ru"] .en{display:none}
html[data-lang="en"] .ru{display:none}

/* background */
.bg-grid{position:fixed;inset:0;z-index:-3;
  background:
    radial-gradient(1200px 700px at 80% -10%,rgba(47,168,255,.18),transparent 60%),
    radial-gradient(900px 600px at 0% 20%,rgba(61,255,143,.12),transparent 60%),
    linear-gradient(180deg,var(--bg),var(--bg2));
}
.bg-grid::after{content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(120,180,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(120,180,255,.05) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse at 50% 20%,#000 20%,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse at 50% 20%,#000 20%,transparent 75%);
}
.bg-glow{position:fixed;z-index:-2;border-radius:50%;filter:blur(110px);opacity:.35;pointer-events:none}
.bg-glow.g1{width:420px;height:420px;background:var(--green);left:-140px;top:30%;animation:drift 14s ease-in-out infinite alternate}
.bg-glow.g2{width:480px;height:480px;background:var(--blue);right:-160px;top:55%;animation:drift 18s ease-in-out infinite alternate-reverse}
@keyframes drift{to{transform:translate(60px,-70px)}}

/* buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:14px;border:1px solid var(--card-b);
  background:rgba(255,255,255,.04);color:var(--text);font-size:16px;font-weight:600;line-height:1;font-family:inherit;
  cursor:pointer;transition:.2s;text-decoration:none!important;
}
.btn:hover{transform:translateY(-2px);border-color:var(--green);box-shadow:var(--glow-g)}
.btn-primary{
  color:#02130a;border:0;
  background:linear-gradient(135deg,var(--green),var(--cyan));
  box-shadow:0 0 28px rgba(61,255,143,.35);
}
.btn-primary:hover{box-shadow:0 0 40px rgba(61,255,143,.6)}
.btn-sm{padding:9px 16px;font-size:14px;border-radius:11px}

/* header */
.top{
  position:sticky;top:0;z-index:50;
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  background:rgba(4,8,22,.72);border-bottom:1px solid rgba(120,180,255,.12);
}
.top-in{max-width:1180px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--text)!important;text-decoration:none!important}
.brand img{width:34px;height:34px;border-radius:9px;object-fit:cover;box-shadow:var(--glow-g)}
.brand span b{color:var(--green)}
.nav{display:flex;gap:6px;margin-left:auto;align-items:center;flex-wrap:wrap}
.nav a.link{color:var(--muted);padding:8px 12px;border-radius:10px;font-size:14px;font-weight:600}
.nav a.link:hover{color:var(--text);background:rgba(255,255,255,.05);text-decoration:none}
.lang{display:flex;border:1px solid rgba(120,180,255,.2);border-radius:10px;overflow:hidden}
.lang button{background:none;border:0;color:var(--muted);padding:7px 11px;font-size:13px;font-weight:700;font-family:inherit;cursor:pointer}
html[data-lang="ru"] .lang [data-l="ru"],html[data-lang="en"] .lang [data-l="en"]{background:rgba(61,255,143,.16);color:var(--green)}
@media(max-width:900px){.nav a.link{display:none}}

/* layout */
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
section{padding:70px 0 10px}
.kicker{display:inline-block;color:var(--green);font-size:13px;font-weight:700;line-height:1.3;letter-spacing:.14em;text-transform:uppercase;margin-bottom:10px}
h2.title{font-size:clamp(28px,4vw,42px);line-height:1.15;margin:0 0 14px;font-weight:800}
h2.title em{font-style:normal;background:linear-gradient(90deg,var(--green),var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{color:var(--muted);font-size:18px;max-width:760px;margin:0 0 30px}

/* hero */
.hero{padding:56px 0 20px}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero h1{font-size:clamp(36px,5.4vw,64px);line-height:1.05;margin:0 0 18px;font-weight:900;letter-spacing:-.02em}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--green),var(--cyan) 60%,var(--blue));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:19px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin:6px 0 26px}
.badges{display:flex;gap:10px;flex-wrap:wrap}
.badge{padding:7px 14px;border-radius:999px;border:1px solid var(--card-b);background:rgba(61,255,143,.07);color:var(--green);font-size:13px;font-weight:700}
.badge.b{border-color:rgba(47,168,255,.35);background:rgba(47,168,255,.08);color:var(--blue)}
.hero-art{position:relative}
.hero-art img{width:100%;max-width:470px;margin:0 auto;border-radius:28px;animation:float 6s ease-in-out infinite;box-shadow:0 0 90px rgba(47,168,255,.28),0 0 60px rgba(61,255,143,.15)}
@keyframes float{50%{transform:translateY(-14px)}}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr}.hero-art{order:-1}.hero-art img{max-width:300px}}

/* cards */
.grid{display:grid;gap:20px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
@media(max-width:900px){.g3,.g2{grid-template-columns:1fr}}
.card{
  background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);
  padding:24px;backdrop-filter:blur(8px);position:relative;
  transition:.25s;
}
.card:hover{border-color:rgba(61,255,143,.5);box-shadow:var(--glow-g)}
.card h3{margin:0 0 8px;font-size:20px}
.card p{margin:0;color:var(--muted)}
.ico{font-size:30px;margin-bottom:10px;filter:drop-shadow(0 0 10px rgba(61,255,143,.5))}

/* steps */
.steps{display:flex;flex-direction:column;gap:22px}
.step{
  display:grid;grid-template-columns:64px 1fr;gap:20px;
  background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:24px;
  scroll-margin-top:90px;transition:.25s;
}
.step:hover{border-color:rgba(61,255,143,.5);box-shadow:var(--glow-g)}
.num{
  width:56px;height:56px;border-radius:16px;display:grid;place-items:center;
  font-size:24px;font-weight:900;line-height:1;font-family:inherit;color:#02130a;
  background:linear-gradient(135deg,var(--green),var(--cyan));box-shadow:0 0 24px rgba(61,255,143,.45);
}
.num.blue{background:linear-gradient(135deg,var(--cyan),var(--blue));box-shadow:0 0 24px rgba(47,168,255,.45)}
.step h3{margin:2px 0 8px;font-size:22px}
.step p{margin:0 0 12px;color:#bcd0ea}
.step ul,.step ol{margin:0 0 12px;padding-left:22px;color:#bcd0ea}
.step li{margin:4px 0}
.step-body.has-img{display:grid;grid-template-columns:1fr minmax(260px,430px);gap:24px;align-items:start}
@media(max-width:1000px){.step-body.has-img{grid-template-columns:1fr}}
@media(max-width:600px){.step{grid-template-columns:1fr}}
figure{margin:0}
figure img{
  width:100%;border-radius:12px;border:1px solid rgba(47,168,255,.35);
  box-shadow:0 0 28px rgba(47,168,255,.2);cursor:zoom-in;transition:.2s;
}
figure img:hover{transform:scale(1.015);box-shadow:0 0 38px rgba(47,168,255,.4)}
figcaption{font-size:12px;color:var(--muted);margin-top:6px;text-align:center}
.imgs{display:grid;gap:12px}

.note{
  border-left:3px solid var(--green);background:rgba(61,255,143,.07);
  padding:12px 16px;border-radius:0 12px 12px 0;color:#d4ffe6;margin:12px 0;font-size:15px
}
.note.blue{border-color:var(--blue);background:rgba(47,168,255,.08);color:#d4ebff}
.note.warn{border-color:#ffc857;background:rgba(255,200,87,.08);color:#ffefc9}
.kbd{display:inline-block;padding:2px 9px;border-radius:7px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);font:600 14px Consolas,monospace;color:#fff}
.tag{display:inline-block;padding:2px 10px;border-radius:999px;background:rgba(47,168,255,.14);color:var(--blue);font-size:12px;font-weight:800;vertical-align:middle;margin-left:6px}
.sep{display:flex;align-items:center;gap:14px;margin:48px 0 6px}
.sep h2{margin:0;font-size:clamp(22px,3vw,30px)}
.sep::after{content:"";flex:1;height:1px;background:linear-gradient(90deg,rgba(61,255,143,.5),transparent)}
.copy{
  display:inline-flex;align-items:center;gap:8px;background:rgba(0,0,0,.35);border:1px dashed rgba(61,255,143,.5);
  color:var(--green);padding:6px 12px;border-radius:10px;font:700 15px Consolas,monospace;cursor:pointer
}

/* modes */
.mode{position:relative;overflow:hidden}
.mode.fast{border-color:rgba(47,168,255,.4)}
.mode.fast:hover{border-color:var(--blue);box-shadow:var(--glow-b)}
.mode .big{font-size:44px;font-weight:900;line-height:1.1;margin:8px 0 2px}
.mode.normal .big{color:var(--green)}
.mode.fast .big{color:var(--blue)}
.mode ul{padding-left:20px;margin:12px 0 0;color:#bcd0ea}
.mode li{margin:6px 0}
.rec{position:absolute;top:16px;right:16px;font-size:12px;font-weight:800;padding:5px 12px;border-radius:999px;background:linear-gradient(135deg,var(--green),var(--cyan));color:#02130a}

table{width:100%;border-collapse:collapse;font-size:15px}
.tbl-wrap{overflow-x:auto;border:1px solid var(--card-b);border-radius:var(--radius);background:var(--card)}
th,td{padding:12px 16px;text-align:left;border-bottom:1px solid rgba(120,180,255,.1);white-space:nowrap}
th{color:var(--green);font-size:12px;text-transform:uppercase;letter-spacing:.1em;background:rgba(61,255,143,.05)}
tr:last-child td{border-bottom:0}
tr.hl td{background:rgba(61,255,143,.1);font-weight:700}
tr.hl td:first-child::before{content:"★ ";color:var(--green)}

/* faq */
details{background:var(--card);border:1px solid var(--card-b);border-radius:14px;padding:16px 20px;margin-bottom:12px}
details[open]{border-color:rgba(61,255,143,.5)}
summary{cursor:pointer;font-weight:700;font-size:17px;list-style:none}
summary::-webkit-details-marker{display:none}
summary::before{content:"+";display:inline-block;width:22px;color:var(--green);font-weight:900}
details[open] summary::before{content:"–"}
details p{color:#bcd0ea;margin:10px 0 0}

/* final CTA / footer */
.cta{
  text-align:center;padding:50px 24px;margin:70px 0 30px;border-radius:26px;
  border:1px solid var(--card-b);
  background:radial-gradient(600px 240px at 50% 0%,rgba(61,255,143,.16),transparent 70%),var(--card);
}
.cta h2{font-size:clamp(26px,4vw,38px);margin:0 0 10px}
.cta p{color:var(--muted);margin:0 0 22px}
footer{text-align:center;color:var(--muted);font-size:14px;padding:20px 0 40px}

/* lightbox */
.lb{position:fixed;inset:0;z-index:100;background:rgba(2,5,14,.92);display:none;align-items:center;justify-content:center;padding:24px;cursor:zoom-out}
.lb.on{display:flex}
.lb img{max-height:92vh;max-width:96vw;border-radius:12px;box-shadow:0 0 80px rgba(47,168,255,.4)}

/* reveal animation */
.rv{opacity:0;transform:translateY(22px);transition:opacity .6s,transform .6s}
.rv.in{opacity:1;transform:none}

/* login page */
.login-body{min-height:100vh;display:grid;place-items:center;padding:24px}
.login-wrap{display:grid;grid-template-columns:1fr 400px;gap:50px;align-items:center;max-width:980px;width:100%}
.login-hero{width:100%;max-width:420px;margin:0 auto;border-radius:28px;animation:float 6s ease-in-out infinite;box-shadow:0 0 90px rgba(47,168,255,.3),0 0 60px rgba(61,255,143,.18)}
.login-card{
  background:var(--card);border:1px solid var(--card-b);border-radius:24px;padding:34px;
  backdrop-filter:blur(14px);box-shadow:0 0 60px rgba(61,255,143,.12);
}
.login-card h1{margin:0 0 6px;font-size:34px;font-weight:900;background:linear-gradient(90deg,var(--green),var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent}
.login-card .sub{color:var(--muted);margin:0 0 18px}
.login-card label{display:block;font-size:13px;color:var(--muted);margin:14px 0 6px;font-weight:700;letter-spacing:.04em}
.login-card input{
  width:100%;padding:13px 15px;border-radius:12px;border:1px solid rgba(120,180,255,.25);
  background:rgba(2,8,24,.7);color:#fff;font-size:16px;outline:none;transition:.2s;font-family:inherit
}
.login-card input:focus{border-color:var(--green);box-shadow:0 0 0 3px rgba(61,255,143,.15),var(--glow-g)}
.login-card .btn{width:100%;margin-top:22px;padding:15px}
.err{margin-top:14px;padding:10px 14px;border-radius:10px;background:rgba(255,92,122,.12);border:1px solid rgba(255,92,122,.4);color:#ffb3c1;font-size:14px}
.lang-mini{display:flex;gap:8px;justify-content:center;margin-top:16px}
.lang-mini button{background:none;border:1px solid rgba(120,180,255,.2);color:var(--muted);border-radius:8px;padding:5px 12px;cursor:pointer;font-family:inherit;font-weight:700;font-size:12px}
.lang-mini button:hover{color:var(--green);border-color:var(--green)}
@media(max-width:860px){.login-wrap{grid-template-columns:1fr;gap:26px}.login-hero{max-width:240px}}