/* NeuroDent AI — продающая страница neurodent.app.
   Цвета — брендбук NeuroDent v1 (переменные --nd-*, как в tokens.css брендбука), светлая тема.
   Mobile-first: базовые правила — для телефона, @media (min-width) — для планшета и компьютера. */

@font-face{font-family:"Inter Tight";font-style:normal;font-weight:100 900;font-display:swap;
  src:url(/fonts/inter-tight-cyrillic-wght-normal.woff2) format("woff2-variations");
  unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Inter Tight";font-style:normal;font-weight:100 900;font-display:swap;
  src:url(/fonts/inter-tight-latin-wght-normal.woff2) format("woff2-variations");
  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+20B8,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

:root{
  --nd-brand:#6C5CF3;--nd-accent:#6553E9;--nd-accent-hover:#5646D2;--nd-accent-soft:#F0EEFF;
  --nd-neuro:#2FD3C3;--nd-neuro-ink:#067971;
  --nd-violet-200:#D9DBFE;--nd-violet-800:#4932B2;--nd-violet-900:#332281;--nd-violet-950:#1C134C;
  --nd-grad-hero:linear-gradient(135deg,#2B1F86 0%,#4B3BD6 42%,#6C5CF3 78%,#8A7CFF 100%);
  --nd-grad-mark:linear-gradient(135deg,#7A6BFF 0%,#4B3BD6 100%);
  --nd-bg:#F9F9FC;--nd-surface:#FFFFFF;--nd-sunken:#F2F2F7;--nd-line:#E4E5EA;--nd-line-strong:#D0D0D9;
  --nd-ink:#191926;--nd-ink-2:#565764;--nd-ink-3:#7F7F8A;
  --nd-shadow-md:0 4px 12px rgb(25 25 38 / .08);--nd-shadow-lg:0 12px 32px rgb(25 25 38 / .12);
  --nd-shadow-brand:0 8px 24px rgb(101 83 233 / .28);
  --nd-ease:cubic-bezier(.22,1,.36,1);
  --font:"Inter Tight",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,system-ui,sans-serif;
  --r-md:12px;--r-lg:16px;--r-xl:24px;
  --gutter:20px;--nav-h:60px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 12px);-webkit-text-size-adjust:100%}
body{margin:0;font:400 16px/1.55 var(--font);color:var(--nd-ink);background:var(--nd-bg);-webkit-font-smoothing:antialiased;overflow-x:clip}
img{max-width:100%;height:auto;display:block}
a{color:var(--nd-accent)}
h1,h2,h3{margin:0;font-weight:800;letter-spacing:-.025em;line-height:1.1;text-wrap:balance}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--nd-accent);outline-offset:3px;border-radius:6px}
.skip{position:absolute;left:12px;top:-60px;z-index:100;background:var(--nd-ink);color:#fff;padding:10px 14px;border-radius:10px}
.skip:focus{top:12px}

.wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 var(--gutter)}

/* Кнопки */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 18px;border-radius:var(--r-md);
  font:700 15px/1.2 var(--font);text-decoration:none;white-space:nowrap;border:1px solid transparent;cursor:pointer;
  transition:transform .15s var(--nd-ease),background .2s,box-shadow .2s,border-color .2s}
.btn:active{transform:scale(.98)}
.btn-primary{background:var(--nd-accent);color:#fff;box-shadow:var(--nd-shadow-brand)}
.btn-primary:hover{background:var(--nd-accent-hover)}
.btn-ghost{background:var(--nd-surface);color:var(--nd-accent);border-color:var(--nd-violet-200)}
.btn-ghost:hover{border-color:var(--nd-accent)}
.btn-white{background:#fff;color:var(--nd-accent-hover)}
.btn-white:hover{background:var(--nd-accent-soft)}
.btn-sm{min-height:38px;padding:0 14px;font-size:14px;box-shadow:none}
.btn-lg{min-height:52px;padding:0 22px;font-size:16px}
.btn-block{width:100%}
.btn[disabled]{opacity:.6;cursor:progress}
.arw{transition:transform .2s var(--nd-ease)}
.btn:hover .arw{transform:translateX(3px)}

/* Шапка */
.nav{position:sticky;top:0;z-index:50;height:var(--nav-h);background:rgb(249 249 252 / .82);
  -webkit-backdrop-filter:saturate(1.6) blur(14px);backdrop-filter:saturate(1.6) blur(14px);border-bottom:1px solid transparent;transition:border-color .2s}
.nav.scrolled{border-bottom-color:var(--nd-line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;gap:12px;height:100%}
.logo{display:block;flex:none}
.logo img{height:24px;width:auto}
.nav-links{display:none}
.nav-cta{display:flex;align-items:center;gap:6px}
.nav-login{color:var(--nd-ink);font-weight:600;font-size:15px;text-decoration:none;padding:10px 8px}
.nav-login:hover{color:var(--nd-accent)}
.hide-xs{display:none}

/* Общие секции */
.sec{position:relative;padding:64px 0}
.sec-alt{background:var(--nd-surface);border-block:1px solid var(--nd-line)}
.sec-head{max-width:680px;margin-bottom:32px}
.sec-head h2{font-size:clamp(28px,7.4vw,44px);margin:10px 0 12px}
.sec-head p{color:var(--nd-ink-2);font-size:17px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font:700 12px/1 var(--font);letter-spacing:.08em;text-transform:uppercase;color:var(--nd-accent)}
.dot{width:8px;height:8px;border-radius:50%;background:var(--nd-neuro);box-shadow:0 0 0 4px rgb(47 211 195 / .22)}

/* Фон-узор «сеть линий и узлов» (брендбук) */
.net{position:absolute;inset:0;z-index:0;pointer-events:none;background:url(/img/network.svg?v=20260929) center/cover no-repeat;
  -webkit-mask-image:linear-gradient(180deg,#000 30%,transparent 100%);mask-image:linear-gradient(180deg,#000 30%,transparent 100%)}
.net-light{background-image:url(/img/network-light.svg?v=20260929);-webkit-mask-image:none;mask-image:none;opacity:.8}

/* Герой */
.hero{position:relative;padding:36px 0 44px;overflow:hidden;
  background:radial-gradient(900px 520px at 85% 10%,rgb(108 92 243 / .16),transparent 70%),radial-gradient(700px 420px at 0% 100%,rgb(47 211 195 / .12),transparent 70%)}
.hero .wrap{position:relative;z-index:1}
.hero-in{display:grid;gap:40px;align-items:center}
.hero h1{font-size:clamp(36px,10.4vw,64px);letter-spacing:-.035em;margin:16px 0 18px}
.grad{background:linear-gradient(100deg,var(--nd-accent) 10%,#8A7CFF 60%,#1FB5A7 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:18px;color:var(--nd-ink-2);max-width:560px}
.cta-row{display:flex;flex-direction:column;gap:10px;margin-top:26px}
.note{margin-top:14px;font-size:14px;color:var(--nd-ink-3)}
.hero-vis{position:relative;display:flex;justify-content:center;padding:6px 0 22px}
.toast{position:absolute;left:0;bottom:0;z-index:2;display:flex;gap:10px;align-items:flex-start;max-width:262px;padding:12px 14px;
  background:rgb(255 255 255 / .94);border:1px solid var(--nd-line);border-radius:var(--r-lg);box-shadow:var(--nd-shadow-lg);font-size:13px;line-height:1.35}
.toast img{width:32px;height:32px;border-radius:9px;flex:none}
.toast b{display:block;font-size:12px;color:var(--nd-ink-3);font-weight:600;margin-bottom:2px}
.facts{display:grid;grid-template-columns:1fr 1fr;gap:1px;margin:34px 0 0;background:var(--nd-line);border:1px solid var(--nd-line);border-radius:var(--r-lg);overflow:hidden}
.facts div{background:var(--nd-surface);padding:14px 16px}
.facts dt{font-weight:800;font-size:16px;letter-spacing:-.01em}
.facts dd{margin:2px 0 0;font-size:13.5px;color:var(--nd-ink-2);line-height:1.35}

/* «Парящий экран»: скрин приложения без корпуса телефона, мягкая тень.
   В покое неподвижен; наклон за курсором — только при наведении мышью (landing.js). */
.screen{--rx:0deg;--ry:0deg;--lift:0px;--gx:0%;--gy:0%;position:relative;margin:0;width:min(250px,66vw);flex:none;
  transform:perspective(1100px) translate3d(0,var(--lift),0) rotateX(var(--rx)) rotateY(var(--ry));transition:transform .55s var(--nd-ease)}
.screen.is-hover{--lift:-8px}
.screen.is-tilting{transition:transform .16s var(--nd-ease)}
.screen::before{content:"";position:absolute;inset:7% 6% 0;z-index:-1;border-radius:40px;background:rgb(51 34 129 / .42);filter:blur(30px);
  transform:translate3d(0,26px,0);opacity:.75;transition:transform .55s var(--nd-ease),opacity .55s}
.screen.is-hover::before{transform:translate3d(0,40px,0) scale(1.03);opacity:1}
.screen-in{position:relative;display:block;border-radius:24px;overflow:hidden;background:#fff;transform:translateZ(0);box-shadow:0 0 0 1px rgb(25 25 38 / .06)}
.screen-in picture,.screen-in img{display:block;width:100%;height:auto}
.screen-in::after{content:"";position:absolute;inset:-40%;pointer-events:none;opacity:0;
  background:radial-gradient(circle at 50% 50%,rgb(255 255 255 / .32),rgb(255 255 255 / 0) 38%);
  transform:translate3d(var(--gx),var(--gy),0);transition:opacity .45s}
.screen.is-hover .screen-in::after{opacity:.55}

/* Боли */
.pains{display:grid;gap:14px}
.pain{background:var(--nd-surface);border:1px solid var(--nd-line);border-radius:var(--r-lg);padding:22px}
.pain-n{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:11px;background:var(--nd-accent-soft);color:var(--nd-accent);font-weight:800;font-size:14px}
.pain h3{font-size:20px;margin:14px 0 8px}
.pain p{color:var(--nd-ink-2)}

/* Функции */
.feat{display:grid;gap:30px;align-items:center;padding:36px 0;border-top:1px solid var(--nd-line)}
.feat:first-of-type{border-top:0;padding-top:8px}
.feat-vis{display:flex;justify-content:center;padding:4px 0 26px}
.feat-duo{gap:0;align-items:flex-start}
.feat-duo .screen{width:min(200px,47vw)}
.feat-duo .screen+.screen{margin-left:-18px;margin-top:40px}
.feat-body h3{font-size:clamp(26px,6.6vw,34px);margin:14px 0 10px}
.feat-body>p{color:var(--nd-ink-2);font-size:17px}
.tag{display:inline-block;padding:6px 11px;border-radius:999px;font:700 12.5px/1 var(--font);letter-spacing:.01em}
.tag-violet{background:#F0EEFF;color:#6553E9}
.tag-sea{background:#DEF4FE;color:#067798}
.tag-turq{background:#D7F8F4;color:#007C73}
.tag-indigo{background:#E9F0FF;color:#2143B9}
.tag-plum{background:#FFEAF2;color:#9B2065}
.tag-orchid{background:#FAEAFF;color:#9E43B8}
.ticks{margin-top:18px;display:grid;gap:10px}
.ticks li{position:relative;padding-left:30px}
.ticks li::before{content:"";position:absolute;left:0;top:3px;width:20px;height:20px;border-radius:6px;background:var(--nd-accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5.5 10.3l3 3 6-6.3' fill='none' stroke='%236553E9' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/20px no-repeat}
.honest{margin-top:18px;padding:12px 14px;border-radius:var(--r-md);background:#E9FBF9;color:#015D56;font-size:14.5px;border-left:3px solid var(--nd-neuro)}

/* Telegram-сводка (вёрстка, не скрин) */
.tg{margin:0;width:min(360px,100%);padding:14px;border-radius:var(--r-xl);background:#E6EBF5;box-shadow:var(--nd-shadow-lg);font-size:14px;line-height:1.45}
.tg-head{display:flex;align-items:center;gap:10px;padding:2px 4px 12px}
.tg-head img{width:36px;height:36px;border-radius:50%}
.tg-head b{display:block;font-size:15px}
.tg-head small{color:var(--nd-ink-3);font-size:12.5px}
.tg-msg{position:relative;background:#fff;border-radius:14px 14px 14px 4px;padding:10px 12px 20px;box-shadow:0 1px 1px rgb(0 0 0 / .06)}
.tg-msg+.tg-msg{margin-top:8px}
.tg-msg p+p{margin-top:8px}
.tg-msg time{position:absolute;right:10px;bottom:5px;font-size:11px;color:var(--nd-ink-3)}
.tg-alert{background:#FFF5F5;box-shadow:inset 3px 0 0 #D7314B}

/* И ещё */
.more{margin-top:26px;padding-top:40px;border-top:1px solid var(--nd-line)}
.more-h{font-size:clamp(24px,6vw,30px);margin-bottom:18px}
.more-grid{display:grid;gap:12px}
.more-grid li{background:var(--nd-bg);border:1px solid var(--nd-line);border-radius:var(--r-lg);padding:18px}
.more-grid b{display:block;font-size:17px;margin-bottom:4px}
.more-grid span{color:var(--nd-ink-2);font-size:15px}

/* Тариф — показывается только при <html data-pricing="on"> */
.pricing-only{display:none}
html[data-pricing="on"] .pricing-only{display:block}
html[data-pricing="on"] .pricing-hide{display:none}
.tariff{display:grid;gap:20px;padding:28px;border-radius:var(--r-xl);background:var(--nd-surface);border:1px solid var(--nd-violet-200);box-shadow:var(--nd-shadow-md)}
.tariff h2{font-size:clamp(28px,7vw,40px);margin:10px 0 8px}
.tariff p{color:var(--nd-ink-2)}

/* Подключение */
.steps{display:grid;gap:12px;counter-reset:s}
.step{position:relative;background:var(--nd-surface);border:1px solid var(--nd-line);border-radius:var(--r-lg);padding:20px 20px 20px 64px;counter-increment:s}
.step::before{content:counter(s);position:absolute;left:18px;top:18px;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;
  background:var(--nd-grad-mark);color:#fff;font-weight:800;font-size:15px}
.step-when{font:700 12px/1 var(--font);letter-spacing:.06em;text-transform:uppercase;color:var(--nd-neuro-ink)}
.step h3{font-size:19px;margin:8px 0 6px}
.step p{color:var(--nd-ink-2);font-size:15px}
.help{display:grid;gap:14px;margin-top:20px;padding:22px;border-radius:var(--r-lg);background:var(--nd-accent-soft);border:1px dashed var(--nd-violet-200)}
.help-plus{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:var(--nd-accent);color:#fff;font-size:24px;font-weight:700}
.help b{font-size:18px}
.help p{color:var(--nd-ink-2);margin-top:4px}
.help .btn{justify-self:start}

/* Тёмные секции: данные и финальный призыв */
.sec-dark{background:var(--nd-grad-hero);color:#fff;overflow:hidden;border:0}
.sec-dark .wrap{position:relative;z-index:1}
.sec-dark .eyebrow{color:var(--nd-neuro)}
.sec-dark .sec-head p{color:rgb(255 255 255 / .8)}
.safe{display:grid;gap:12px}
.safe li{padding:20px;border-radius:var(--r-lg);background:rgb(255 255 255 / .09);border:1px solid rgb(255 255 255 / .16)}
.safe b{display:block;font-size:17px;margin-bottom:4px}
.safe span{color:rgb(255 255 255 / .82);font-size:15px}
.safe-foot{margin-top:20px;color:rgb(255 255 255 / .85);font-size:15px;padding-left:14px;border-left:3px solid var(--nd-neuro)}

/* FAQ */
.faq-grid{display:grid;gap:8px}
.faq details{border-bottom:1px solid var(--nd-line)}
.faq summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;gap:16px;padding:18px 0;font-weight:700;font-size:17px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";flex:none;display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--nd-accent-soft);color:var(--nd-accent);font-weight:700;transition:transform .2s var(--nd-ease)}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{padding:0 0 18px;color:var(--nd-ink-2)}

/* Финальный призыв + форма */
.cta-grid{display:grid;gap:32px;align-items:start}
.cta-copy h2{font-size:clamp(30px,8vw,48px);margin:10px 0 14px}
.cta-copy p{color:rgb(255 255 255 / .85);font-size:17px;margin-bottom:24px}
.contacts{display:grid;gap:10px;margin-top:26px}
.contacts a{display:flex;flex-direction:column;padding:14px 16px;border-radius:var(--r-md);background:rgb(255 255 255 / .09);border:1px solid rgb(255 255 255 / .16);color:#fff;text-decoration:none;font-weight:700}
.contacts a:hover{background:rgb(255 255 255 / .15)}
.contacts span{font-size:12px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:rgb(255 255 255 / .7)}
.form-card{background:var(--nd-surface);color:var(--nd-ink);border-radius:var(--r-xl);padding:24px;box-shadow:0 24px 60px rgb(20 12 70 / .35)}
.form-card h3{font-size:24px}
.form-card .sub{color:var(--nd-ink-2);font-size:15px;margin:6px 0 18px}
.field{display:block;margin-bottom:14px}
.field span{display:block;font-size:14px;font-weight:600;margin-bottom:6px}
.field input,.field textarea{width:100%;min-height:48px;padding:12px 14px;border:1px solid var(--nd-line-strong);border-radius:var(--r-md);background:var(--nd-bg);
  font:400 16px/1.4 var(--font);color:var(--nd-ink);transition:border-color .2s,box-shadow .2s}
.field textarea{resize:vertical;min-height:88px}
.field input:focus,.field textarea:focus{outline:0;border-color:var(--nd-accent);box-shadow:0 0 0 3px rgb(101 83 233 / .18);background:#fff}
.field-err{border-color:#D7314B!important;box-shadow:0 0 0 3px rgb(215 49 75 / .14)!important}
.hp{position:absolute!important;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-msg{min-height:20px;margin-top:12px;text-align:center;font-weight:600;font-size:14.5px}
.form-msg.ok{color:#056940}.form-msg.err{color:#BA1A3A}
.form-note{margin-top:10px;text-align:center;font-size:12.5px;color:var(--nd-ink-3)}

/* Подвал */
.foot{background:var(--nd-surface);border-top:1px solid var(--nd-line);padding:40px 0 28px}
.foot-in{display:grid;gap:24px}
.foot-brand p{margin-top:12px;color:var(--nd-ink-2);font-size:15px;max-width:380px}
.foot-links{display:grid;gap:10px}
.foot-links a{color:var(--nd-ink);text-decoration:none;font-weight:600;font-size:15px}
.foot-links a:hover{color:var(--nd-accent)}
.foot-copy{margin-top:28px;color:var(--nd-ink-3);font-size:13px}

/* Появление при прокрутке — только если скрипт загрузился (без JS всё видно сразу) */
.js .rev{opacity:0;transform:translateY(22px);transition:opacity .6s var(--nd-ease),transform .6s var(--nd-ease)}
.js .rev.in{opacity:1;transform:none}

@media (min-width:420px){.hide-xs{display:inline}}

@media (min-width:640px){
  :root{--gutter:28px}
  .cta-row{flex-direction:row;flex-wrap:wrap}
  .pains,.more-grid,.safe{grid-template-columns:1fr 1fr}
  .facts{grid-template-columns:repeat(4,1fr)}
  .toast{left:auto;right:calc(50% + 70px)}
  .help{grid-template-columns:auto 1fr auto;align-items:center}
  .help .btn{justify-self:end}
  .contacts{grid-template-columns:1fr 1fr}
}

@media (min-width:960px){
  :root{--nav-h:68px}
  .nav-links{display:flex;gap:26px}
  .nav-links a{color:var(--nd-ink-2);text-decoration:none;font-weight:600;font-size:15px}
  .nav-links a:hover{color:var(--nd-accent)}
  .nav-login{margin-right:6px}
  .logo img{height:26px}
  .sec{padding:104px 0}
  .sec-head{margin-bottom:48px}
  .hero{padding:64px 0 72px}
  .hero-in{grid-template-columns:1.1fr .9fr;gap:40px}
  .lead{font-size:19px}
  .screen{width:290px}
  .hero-vis{padding:0 0 30px}
  .toast{right:auto;left:-10px;bottom:40px}
  .pains{grid-template-columns:repeat(4,1fr)}
  .feat{grid-template-columns:1fr 1fr;gap:64px;padding:64px 0}
  .feat-rev .feat-vis{order:2}
  .feat-duo .screen{width:240px}
  .feat-duo .screen+.screen{margin-left:-30px;margin-top:64px}
  .more-grid{grid-template-columns:repeat(3,1fr)}
  .tariff{grid-template-columns:1fr auto;align-items:center;padding:40px 48px}
  .steps{grid-template-columns:repeat(5,1fr)}
  .step{padding:64px 20px 22px}
  .step::before{left:20px;top:20px}
  .safe{grid-template-columns:repeat(3,1fr)}
  .faq-grid{grid-template-columns:.8fr 1.2fr;gap:64px}
  .cta-grid{grid-template-columns:1fr 440px;gap:64px}
  .form-card{padding:32px}
  .foot-in{grid-template-columns:1fr auto;align-items:start}
  .foot-links{grid-template-columns:repeat(2,auto);column-gap:40px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .screen,.screen::before,.js .rev{transform:none!important;transition:none!important}
  .js .rev{opacity:1}
}