/* VOLYAR X: night-arena look. Deep navy, electric blue, data in monospace. Single dark theme by design. */
/* Fonts are served from this site, so visitors make no requests to Google. Files and SIL OFL licences: assets/fonts/.
   Same variable-font files, weights and unicode ranges Google Fonts served before, so pages render the same.
   JetBrains Mono also has its latin-ext file: the rouble sign (U+20BD) on the home page is in that range. */
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:500;font-display:swap;src:url(../fonts/jetbrains-mono-cyrillic.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:500;font-display:swap;src:url(../fonts/jetbrains-mono-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:500;font-display:swap;src:url(../fonts/jetbrains-mono-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:700;font-display:swap;src:url(../fonts/jetbrains-mono-cyrillic.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:700;font-display:swap;src:url(../fonts/jetbrains-mono-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:700;font-display:swap;src:url(../fonts/jetbrains-mono-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Manrope";font-style:normal;font-weight:400;font-display:swap;src:url(../fonts/manrope-cyrillic.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Manrope";font-style:normal;font-weight:400;font-display:swap;src:url(../fonts/manrope-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Manrope";font-style:normal;font-weight:600;font-display:swap;src:url(../fonts/manrope-cyrillic.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Manrope";font-style:normal;font-weight:600;font-display:swap;src:url(../fonts/manrope-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Manrope";font-style:normal;font-weight:700;font-display:swap;src:url(../fonts/manrope-cyrillic.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Manrope";font-style:normal;font-weight:700;font-display:swap;src:url(../fonts/manrope-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Manrope";font-style:normal;font-weight:800;font-display:swap;src:url(../fonts/manrope-cyrillic.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Manrope";font-style:normal;font-weight:800;font-display:swap;src:url(../fonts/manrope-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Marck Script";font-style:normal;font-weight:400;font-display:swap;src:url(../fonts/marck-script-cyrillic.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Marck Script";font-style:normal;font-weight:400;font-display:swap;src:url(../fonts/marck-script-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Unbounded";font-style:normal;font-weight:700;font-display:swap;src:url(../fonts/unbounded-cyrillic.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Unbounded";font-style:normal;font-weight:700;font-display:swap;src:url(../fonts/unbounded-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Unbounded";font-style:normal;font-weight:800;font-display:swap;src:url(../fonts/unbounded-cyrillic.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Unbounded";font-style:normal;font-weight:800;font-display:swap;src:url(../fonts/unbounded-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
:root{
  --bg:#060A14; --bg2:#0A1122; --card:#0E1730; --card2:#121D3B; --line:rgba(120,160,255,.14); --line2:rgba(120,160,255,.28);
  --ink:#EAF0FF; --muted:#93A3C7; --dim:#61719A;
  --blue:#1E8BFF; --blue2:#58B4FF; --blue-deep:#0E56C9; --green:#2BD47D; --amber:#F5B341; --red:#FF5A6A;
  --f-display:"Unbounded","Arial Black","Segoe UI",system-ui,sans-serif;
  --f-body:"Manrope","Segoe UI",system-ui,-apple-system,sans-serif;
  --f-mono:"JetBrains Mono","Consolas","Menlo",monospace;
  --radius:18px; --gut:clamp(16px,4vw,32px);
  color-scheme:dark;
}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 1rem/1.65 var(--f-body);-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,svg{max-width:100%}
a{color:var(--blue2);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{margin:0;font-family:var(--f-display);letter-spacing:-.01em;line-height:1.12;text-wrap:balance}
h1{font-weight:800;font-size:clamp(1.9rem,6vw,4.2rem);text-transform:uppercase}
h2{font-weight:700;font-size:clamp(1.45rem,3.6vw,2.4rem)}
h3{font-weight:700;font-size:1.12rem}
p{margin:0}
ul,ol{margin:0;padding-left:1.2em}
:focus-visible{outline:3px solid var(--blue2);outline-offset:3px;border-radius:6px}
.wrap{max-width:1440px;margin-inline:auto;padding-inline:var(--gut)}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.muted{color:var(--muted)}
.blue{color:var(--blue2)}
.eyebrow{font-family:var(--f-mono);font-size:.78rem;letter-spacing:.18em;text-transform:uppercase;color:var(--blue2)}
.lead{font-size:1.12rem;color:var(--muted);max-width:62ch}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(6,10,20,.82);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;gap:20px;min-height:68px}
.logo{display:flex;flex-direction:column;line-height:1;white-space:nowrap;flex:none;text-decoration:none!important;color:var(--ink)}
.logo b{font-family:var(--f-display);font-weight:800;font-size:1.32rem;letter-spacing:.06em}
.logo b i{font-style:normal;color:var(--blue)}
.logo small{font-family:var(--f-mono);font-size:.56rem;letter-spacing:.32em;color:var(--dim);margin-top:4px}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{color:var(--muted);font-weight:700;font-size:.93rem;padding:8px 12px;border-radius:10px}
.nav a:hover,.nav a[aria-current="page"]{color:var(--ink);background:rgba(120,160,255,.08);text-decoration:none}
.head-cta{display:flex;gap:10px}
.nav-cta{display:none}
.burger{display:none;margin-left:auto;background:none;border:1px solid var(--line2);color:var(--ink);border-radius:10px;width:44px;height:40px;cursor:pointer}
.burger span{display:block;width:18px;height:2px;background:currentColor;margin:4px auto;border-radius:2px}
@media (max-width:1100px){
  .nav,.head-cta{display:none}
  .burger{display:block}
  .site-header.open .nav .nav-cta{display:flex;gap:10px;margin-top:10px}
  .site-header.open .nav .nav-cta .btn{flex:1}
  .site-header.open .nav{display:flex;flex-direction:column;position:absolute;left:0;right:0;top:68px;background:var(--bg2);padding:12px var(--gut) 18px;border-bottom:1px solid var(--line)}
}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:800 .95rem/1 var(--f-body);padding:13px 20px;border-radius:12px;border:1px solid transparent;cursor:pointer;text-decoration:none!important;white-space:nowrap;transition:transform .12s ease,background .12s ease}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:linear-gradient(180deg,#2C96FF,#1572E8);color:#fff;box-shadow:0 8px 24px -8px rgba(30,139,255,.7)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line2)}
.btn-ghost:hover{background:rgba(120,160,255,.08)}
.btn-lg{padding:16px 24px;font-size:1rem}
.btn[disabled]{opacity:.6;cursor:not-allowed;transform:none}

/* sections */
section{padding-block:clamp(56px,8vw,104px);position:relative}
.sec-head{display:grid;gap:12px;margin-bottom:34px;max-width:760px}
.card{background:linear-gradient(180deg,var(--card),var(--bg2));border:1px solid var(--line);border-radius:var(--radius);padding:clamp(18px,2.6vw,26px)}
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:980px){.g4{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:minmax(0,1fr)}}
@media (max-width:640px){.g2,.g4{grid-template-columns:minmax(0,1fr)}}
.pill{display:inline-flex;align-items:center;gap:6px;font:800 .72rem/1 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;padding:6px 10px;border-radius:999px;border:1px solid var(--line2);color:var(--muted)}
.pill.win{color:var(--green);border-color:rgba(43,212,125,.4);background:rgba(43,212,125,.08)}
.pill.sharp{color:var(--blue2);border-color:rgba(88,180,255,.45);background:rgba(30,139,255,.1)}
.pill.example{color:var(--amber);border-color:rgba(245,179,65,.45);background:rgba(245,179,65,.08)}
.divider{height:1px;background:var(--line);border:0;margin:0}

/* page hero for inner pages */
.page-hero{padding-block:clamp(44px,7vw,84px) 10px}
.page-hero .wrap{display:grid;gap:14px}
.page-hero h1{font-size:clamp(1.7rem,4.6vw,3rem)}

/* prose for academy & legal */
.prose{max-width:720px;font-size:1.06rem}
.prose > * + *{margin-top:1.05em}
.prose h2{font-size:clamp(1.25rem,2.6vw,1.6rem);margin-top:1.8em}
.prose h3{margin-top:1.4em}
.prose li + li{margin-top:.4em}
.prose blockquote{margin:1.2em 0;padding:14px 18px;border-left:3px solid var(--blue);background:rgba(30,139,255,.07);border-radius:0 12px 12px 0;color:var(--ink)}
.prose table{width:100%;border-collapse:collapse;font-size:.95rem}
.prose th,.prose td{border-bottom:1px solid var(--line);padding:9px 10px;text-align:left}
.prose th{color:var(--muted);font-size:.78rem;letter-spacing:.06em;text-transform:uppercase}
.prose .table-wrap{overflow-x:auto}
.prose code,.formula{font-family:var(--f-mono);background:rgba(120,160,255,.1);padding:2px 6px;border-radius:6px;font-size:.92em}
.formula{display:block;padding:12px 14px;margin:1em 0;white-space:pre-wrap}
.note{font-size:.92rem;color:var(--muted)}
.article-meta{display:flex;flex-wrap:wrap;gap:8px 16px;color:var(--dim);font:600 .85rem/1 var(--f-mono)}
.cta-box{margin-top:2.2em;padding:22px;border-radius:var(--radius);border:1px solid var(--line2);background:radial-gradient(120% 140% at 0% 0%,rgba(30,139,255,.22),transparent 60%),var(--card);display:grid;gap:12px}
.cta-box .row{display:flex;flex-wrap:wrap;gap:10px}

/* forms */
.field{display:grid;gap:6px}
.field label{font-weight:800;font-size:.9rem}
.field input,.field select{font:600 1rem var(--f-body);color:var(--ink);background:var(--bg);border:1px solid var(--line2);border-radius:12px;padding:13px 14px;width:100%}
.field input:focus{outline:2px solid var(--blue);border-color:transparent}
.field .hint{font-size:.82rem;color:var(--dim)}
.check{display:flex;gap:10px;align-items:flex-start;font-size:.9rem;color:var(--muted)}
.check input{width:20px;height:20px;margin-top:2px;accent-color:var(--blue);flex:none}
.form-error{color:var(--red);font-weight:700;font-size:.92rem}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}

/* footer */
.site-footer{border-top:1px solid var(--line);padding-block:44px 34px;background:var(--bg2)}
.foot{display:grid;grid-template-columns:1.4fr repeat(3,minmax(0,1fr));gap:28px}
.foot h4{font-family:var(--f-mono);font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;color:var(--dim);margin-bottom:10px;font-weight:700}
.foot ul{list-style:none;padding:0;display:grid;gap:7px}
.foot a{color:var(--muted);font-weight:600}
.foot .disc{font-size:.84rem;color:var(--dim);margin-top:14px;max-width:46ch}
.age{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:50%;border:2px solid var(--red);color:var(--red);font:800 .82rem var(--f-mono)}
.foot-bottom{display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;margin-top:30px;padding-top:18px;border-top:1px solid var(--line);color:var(--dim);font-size:.84rem}
@media (max-width:860px){.foot{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:520px){.foot{grid-template-columns:minmax(0,1fr)}}

/* sticky mobile CTA */
.mobile-cta{display:none}
@media (max-width:760px){
  .mobile-cta{display:flex;position:fixed;left:12px;right:12px;bottom:calc(12px + env(safe-area-inset-bottom,0px));z-index:60;gap:8px;padding:8px;border-radius:16px;background:rgba(10,17,34,.92);border:1px solid var(--line2);backdrop-filter:blur(10px)}
  .mobile-cta .btn{flex:1;padding:12px 10px;font-size:.88rem}
  body{padding-bottom:84px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}html{scroll-behavior:auto}}

/* --- launch states, errors, header tagline (reference-inspired) --- */
.is-soon{cursor:not-allowed;opacity:.72;text-decoration:none!important}
.btn.is-soon{border-style:dashed;transform:none!important;box-shadow:none}
.btn-primary.is-soon{background:transparent;color:var(--ink);border-color:var(--line2)}
.soon-tag{display:inline-block;font:800 .66rem/1 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--amber);border:1px solid rgba(245,179,65,.45);border-radius:6px;padding:3px 5px;margin-left:4px;vertical-align:middle}
.st-on,.st-soon{display:inline-flex;align-items:center;gap:7px;font-weight:800}
.st-on{color:var(--green)} .st-soon{color:var(--amber)}
.st-on::before,.st-soon::before{content:"";width:8px;height:8px;border-radius:50%;background:currentColor;box-shadow:0 0 10px currentColor}
.head-tag{margin:0 0 0 6px;font:700 .58rem/1.35 var(--f-mono);letter-spacing:.12em;color:var(--blue2);white-space:nowrap}
@media (max-width:1580px){.head-tag{display:none}}
.field-err{font-size:.84rem;font-weight:700;color:var(--red)}
.field input[aria-invalid="true"]{border-color:var(--red);outline-color:var(--red)}
.foot-social a{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:50%;border:1px solid var(--line2);color:var(--muted)}
.foot-social a.is-soon{opacity:.5}
.foot-social a[href]:hover{color:var(--ink)}
.linklike{background:none;border:0;padding:0;font:inherit;color:var(--blue2);cursor:pointer;text-decoration:underline}
/* long Russian words must never widen the page */
h1,h2,h3{overflow-wrap:break-word}
.page-hero h1{text-transform:none;font-size:clamp(1.55rem,4.6vw,3rem)}