:root{--bg:#F5F6F8;--surface:#fff;--ink:#121820;--muted:#566070;--line:#DDE1E8;--accent:#1D4ED8;--accent-ink:#fff;--soft:#E8EEFC;--ph:#FFF3C4;--ph-ink:#6B5300;--r:14px;box-sizing:border-box}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#0E131B;--surface:#161D28;--ink:#EEF1F6;--muted:#9AA5B6;--line:#273041;--accent:#6D93FF;--accent-ink:#0E131B;--soft:#1B2740;--ph:#3A3110;--ph-ink:#F4D56A}}
*,*::before,*::after{box-sizing:inherit}
html{scroll-behavior:smooth;scroll-padding-top:76px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 17px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;padding-bottom:env(safe-area-inset-bottom,0)}
h1,h2,h3{line-height:1.12;letter-spacing:-.02em;margin:0 0 .5em}
h1{font-size:clamp(2.2rem,7vw,4rem);font-weight:750}
h2{font-size:clamp(1.7rem,4.5vw,2.5rem);font-weight:720}
h3{font-size:1.15rem;font-weight:650;letter-spacing:-.01em}
p{margin:0 0 1em}a{color:inherit}
.wrap{width:min(1120px,100% - 40px);margin-inline:auto}
section{padding:72px 0}
.lead{font-size:1.15rem;color:var(--muted);max-width:60ch}
.ph{background:var(--ph);color:var(--ph-ink);padding:0 .3em;border-radius:4px;font-weight:600}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 24px;border-radius:12px;font:600 1rem/1 inherit;text-decoration:none;border:1.5px solid transparent;cursor:pointer;transition:transform .15s,background .15s,border-color .15s}
.btn:active{transform:scale(.98)}
.btn-p{background:var(--accent);color:var(--accent-ink)}.btn-p:hover{filter:brightness(1.08)}
.btn-s{background:transparent;border-color:var(--line);color:var(--ink)}.btn-s:hover{border-color:var(--accent)}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:6px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:var(--surface);padding:10px;z-index:99}
/* nav */
header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid transparent;padding-top:env(safe-area-inset-top,0);transition:border-color .2s}
header.scrolled{border-color:var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.logo{font-weight:760;letter-spacing:-.02em;text-decoration:none;font-size:1.1rem}
.links{display:flex;align-items:center;gap:26px}
.links a:not(.btn){text-decoration:none;color:var(--muted);font-size:.95rem;font-weight:500}.links a:not(.btn):hover{color:var(--ink)}
.links .btn{min-height:40px;padding:0 18px}
.burger{display:none;background:none;border:1.5px solid var(--line);border-radius:10px;width:44px;height:44px;color:var(--ink);cursor:pointer}
@media(max-width:860px){.burger{display:block}.links{position:absolute;left:0;right:0;top:100%;background:var(--bg);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:0;padding:8px 20px 20px;display:none}.links.open{display:flex}.links a:not(.btn){padding:14px 0;font-size:1.05rem;border-bottom:1px solid var(--line)}.links .btn{margin-top:14px;min-height:48px}}
/* hero */
.hero{padding:64px 0 56px}
.hero .cta{display:flex;flex-wrap:wrap;gap:12px;margin:28px 0 24px}
@media(max-width:520px){.hero .cta .btn{width:100%}}
.checks{display:flex;flex-wrap:wrap;gap:8px 22px;list-style:none;padding:0;margin:0 0 14px;color:var(--muted);font-size:.98rem}
.checks li::before{content:"✓";color:var(--accent);font-weight:800;margin-right:8px}
.note{font-size:.9rem;color:var(--muted)}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin-top:44px}
.facts div{background:var(--surface);padding:18px 20px}.facts b{display:block;font-size:.85rem;color:var(--muted);font-weight:500}
/* cards */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px;margin-top:32px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:26px}
.card p{color:var(--muted);margin:0}
.alt{background:var(--surface);border-block:1px solid var(--line)}
.alt .card{background:var(--bg)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
@media(max-width:820px){.two{grid-template-columns:1fr;gap:24px}section{padding:56px 0}}
ul.tick{list-style:none;padding:0;margin:0}
ul.tick li{padding:12px 0 12px 34px;position:relative;border-bottom:1px solid var(--line)}
ul.tick li::before{content:"";position:absolute;left:0;top:17px;width:20px;height:20px;border-radius:50%;background:var(--soft)}
ul.tick li::after{content:"";position:absolute;left:7px;top:21px;width:5px;height:9px;border:solid var(--accent);border-width:0 2px 2px 0;transform:rotate(45deg)}
/* steps */
.steps{list-style:none;padding:0;margin:36px 0 0;display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:s}
.steps li{counter-increment:s;position:relative;padding-top:48px}
.steps li::before{content:counter(s);position:absolute;top:0;left:0;width:34px;height:34px;border-radius:50%;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-weight:700;font-size:.95rem}
.steps li::after{content:"";position:absolute;top:16px;left:44px;right:-6px;height:2px;background:var(--line)}
.steps li:last-child::after{display:none}
@media(max-width:820px){.steps{grid-template-columns:1fr;gap:0}.steps li{padding:0 0 28px 54px}.steps li::after{top:38px;left:16px;right:auto;width:2px;height:calc(100% - 40px)}}
.steps p{color:var(--muted);margin:0;font-size:.97rem}
/* form */
form{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:28px;margin-top:28px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:640px){.row{grid-template-columns:1fr}form{padding:20px}}
.f{margin-bottom:16px}
label,legend{display:block;font-weight:600;font-size:.93rem;margin-bottom:6px}
input,select,textarea{width:100%;min-height:48px;padding:11px 14px;border:1.5px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink);font:inherit;font-size:16px}
textarea{min-height:110px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--soft)}
.f.bad input,.f.bad select,.f.bad textarea{border-color:#C62828}
.err{color:#C62828;font-size:.85rem;margin-top:4px;display:none}.f.bad .err{display:block}
@media(prefers-color-scheme:dark){.err{color:#FF8A80}}
.scenario{background:var(--soft);border-radius:12px;padding:16px 18px;margin-bottom:10px;font-size:.97rem}
.chk{display:flex;gap:12px;align-items:flex-start;margin-bottom:12px}.chk input{width:22px;min-height:22px;margin-top:3px;flex:none}.chk label{font-weight:400;margin:0}
.hp{position:absolute;left:-9999px}
.msg{display:none;padding:16px 18px;border-radius:12px;margin-top:16px}
.msg.ok{background:#E3F4E8;color:#14532D}.msg.ko{background:#FCE8E8;color:#7F1D1D}
.msg.show{display:block}
/* cta band */
.band{background:var(--ink);color:var(--bg);border-radius:20px;padding:48px 32px;text-align:center}
.band p{color:inherit;opacity:.8;max-width:52ch;margin:0 auto 24px}
.band .btn-p{background:var(--bg);color:var(--ink)}
/* faq */
details{border-bottom:1px solid var(--line);padding:4px 0}
summary{cursor:pointer;font-weight:620;padding:16px 36px 16px 0;list-style:none;position:relative}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:4px;top:12px;font-size:1.5rem;color:var(--accent);transition:transform .2s}
details[open] summary::after{transform:rotate(45deg)}
details p{color:var(--muted);padding-right:30px}
footer{border-top:1px solid var(--line);padding:48px 0 110px;color:var(--muted);font-size:.95rem}
footer .cols{display:flex;flex-wrap:wrap;justify-content:space-between;gap:28px}
footer a{display:block;text-decoration:none;padding:3px 0}footer a:hover{color:var(--ink)}
.sticky{position:fixed;left:0;right:0;bottom:0;z-index:40;padding:10px 16px calc(10px + env(safe-area-inset-bottom,0));background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(10px);border-top:1px solid var(--line);display:none;gap:10px;transform:translateY(100%);transition:transform .25s}
.sticky.show{transform:none}.sticky .btn{flex:1;min-height:46px;padding:0 10px;font-size:.95rem}
@media(max-width:860px){.sticky{display:flex}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* ===== Premium LED theme (dark, vivid but restrained) ===== */
:root,:root:not([data-theme=light]){color-scheme:dark;--bg:#080C15;--surface:#0F1522;--ink:#EAF0FA;--muted:#9BA8BF;--line:#1F2940;--accent:#6C8CFF;--accent-ink:#fff;--soft:#16203A;--ph:#3A3110;--ph-ink:#F4D56A;--grad:linear-gradient(135deg,#3B6BFF,#7C4DFF);--led:#22D3EE}
::selection{background:#4B5BFF;color:#fff}
body{background:var(--bg);overflow-x:hidden}
header,main,footer,.sticky{position:relative;z-index:1}
header{position:sticky;z-index:50;background:rgba(8,12,21,.7)}
.aura{position:fixed;inset:0;z-index:0;pointer-events:none;--mx:50%;--my:18%;
 background:
  radial-gradient(520px circle at var(--mx) var(--my),rgba(108,140,255,.20),transparent 62%),
  radial-gradient(700px circle at 92% 6%,rgba(124,77,255,.16),transparent 60%),
  radial-gradient(760px circle at 4% 72%,rgba(34,211,238,.10),transparent 60%)}
.alt{background:rgba(255,255,255,.022);border-color:var(--line)}
.logo{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
h1{background:linear-gradient(180deg,#fff 30%,#AFC0EE);-webkit-background-clip:text;background-clip:text;color:transparent}
.checks li::before{color:var(--led);text-shadow:0 0 10px rgba(34,211,238,.7)}
/* buttons */
.btn{position:relative;overflow:hidden;isolation:isolate}
.btn::before{content:"";position:absolute;inset:0;z-index:-1;opacity:0;transition:opacity .25s;background:radial-gradient(120px circle at var(--x,50%) var(--y,50%),rgba(255,255,255,.28),transparent 70%)}
.btn:hover::before{opacity:1}
.btn-p,.band .btn-p{background:var(--grad);color:#fff;box-shadow:0 6px 22px -8px rgba(99,102,255,.7),inset 0 1px 0 rgba(255,255,255,.22)}
.btn-p:hover,.band .btn-p:hover{filter:none;transform:translateY(-2px);box-shadow:0 12px 34px -6px rgba(124,77,255,.75),0 0 0 1px rgba(160,170,255,.35),inset 0 1px 0 rgba(255,255,255,.3)}
.btn-s{background:rgba(255,255,255,.04);border-color:rgba(140,160,255,.28);color:var(--ink)}
.btn-s:hover{transform:translateY(-2px);border-color:rgba(130,160,255,.75);background:rgba(108,140,255,.1);box-shadow:0 0 24px -6px rgba(34,211,238,.45)}
/* cards with cursor spotlight */
.card,.alt .card,.facts div,form{position:relative;overflow:hidden;background:var(--surface);border:1px solid var(--line);transition:transform .25s,border-color .25s,box-shadow .25s}
.card::before,.facts div::before,form::before{content:"";position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .3s;background:radial-gradient(300px circle at var(--x,50%) var(--y,50%),rgba(108,140,255,.17),transparent 70%)}
.card:hover::before,.facts div:hover::before,form:hover::before{opacity:1}
.card:hover{transform:translateY(-4px);border-color:rgba(120,150,255,.5);box-shadow:0 18px 40px -22px rgba(90,110,255,.65)}
.card>*,.facts div>*{position:relative}
.facts{background:var(--line)}.facts div{border:0;border-radius:0}
.card h3::before{content:"";display:block;width:28px;height:3px;border-radius:3px;margin-bottom:14px;background:var(--grad);box-shadow:0 0 12px rgba(34,211,238,.55)}
/* lists, steps, faq */
ul.tick li::before{background:rgba(34,211,238,.12)}
ul.tick li::after{border-color:var(--led);filter:drop-shadow(0 0 4px rgba(34,211,238,.7))}
.steps li::before{background:var(--grad);color:#fff;box-shadow:0 0 18px rgba(124,77,255,.6)}
.steps li::after{background:linear-gradient(90deg,rgba(124,77,255,.6),var(--line))}
summary{transition:color .2s}summary:hover{color:#fff}
details[open]{background:linear-gradient(180deg,rgba(108,140,255,.05),transparent)}
/* inputs */
input,select,textarea{background:#0B111D;border-color:var(--line);transition:border-color .2s,box-shadow .2s}
input:hover,select:hover,textarea:hover{border-color:#34426A}
input:focus,select:focus,textarea:focus{border-color:#7C8CFF;box-shadow:0 0 0 3px rgba(108,140,255,.22),0 0 22px -4px rgba(108,140,255,.5)}
.msg.ok{background:rgba(34,197,94,.12);color:#8EE6AE;border:1px solid rgba(34,197,94,.35)}
.msg.ko{background:rgba(239,68,68,.12);color:#FFA8A8;border:1px solid rgba(239,68,68,.35)}
.err{color:#FF8A80}
/* telegram band */
.band{position:relative;overflow:hidden;color:var(--ink);background:linear-gradient(135deg,rgba(59,107,255,.30),rgba(124,77,255,.22) 60%,rgba(34,211,238,.14));border:1px solid rgba(140,160,255,.3);box-shadow:0 30px 80px -40px rgba(99,102,255,.7)}
.band>*{position:relative}
.band p{opacity:.85}
.sticky{background:rgba(8,12,21,.85)}
/* hero entrance (single moment) */
.hero h1,.hero .lead,.hero .cta,.hero .checks{animation:up .8s cubic-bezier(.2,.7,.2,1) both}
.hero .lead{animation-delay:.1s}.hero .cta{animation-delay:.2s}.hero .checks{animation-delay:.3s}
@keyframes up{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
@media(prefers-reduced-motion:reduce){.hero *{animation:none!important}.card:hover,.btn:hover{transform:none!important}}