/* ============================================================
   Studio — драфт скролл-лендинга
   Нейтральная палитра, Inter, всё движение — от скролла.
   ============================================================ */

/* ---------- 1. Токены ---------- */
:root{
  --ink:#0c0c0d;          /* тёмная база */
  --ink-2:#141416;        /* карточки на тёмном */
  --paper:#f1f0ee;        /* светлая база */
  --paper-2:#e4e3e0;

  --fg:#eceae7;           /* текст на тёмном */
  --fg-dim:#8b8a86;
  --fg-inv:#0c0c0d;       /* текст на светлом */
  --fg-inv-dim:#6d6c68;

  --line:rgba(236,234,231,.14);
  --line-inv:rgba(12,12,13,.14);

  --pad:clamp(16px,4vw,64px);
  --nav-h:76px;
  --r:14px;

  --ease:cubic-bezier(.22,1,.36,1);
  --ease-io:cubic-bezier(.65,0,.35,1);

  --f:"Inter","Inter Placeholder",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
}

/* ---------- 2. База ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink);
  color:var(--fg);
  font-family:var(--f);
  font-size:16px;
  line-height:1.5;
  font-feature-settings:"cv05" 1,"ss03" 1;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body.is-locked{overflow:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,p,ul{margin:0}
ul{list-style:none;padding:0}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--fg);color:var(--ink)}

section{position:relative}
section[id]{scroll-margin-top:var(--nav-h)}
[data-theme="light"]{background:var(--paper);color:var(--fg-inv)}
[data-theme="light"] .label{color:var(--fg-inv-dim)}

/* ---------- 3. Общая типографика ---------- */
.h2{
  font-size:clamp(2rem,5.6vw,5rem);
  font-weight:600;
  letter-spacing:-.035em;
  line-height:.98;
}
.label{
  display:block;
  font-size:11px;
  font-weight:500;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--fg-dim);
}
.tag{
  font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--fg-dim);
}

/* Маска-строка для reveal-анимации */
.line{display:block;overflow:hidden;padding-bottom:.06em;margin-bottom:-.06em}
.line__in{
  display:block;
  transform:translate3d(0,110%,0);
  transition:transform 1.05s var(--ease);
  transition-delay:var(--d,0ms);
}
.is-in .line__in{transform:translate3d(0,0,0)}

[data-fade]{opacity:0;transform:translate3d(0,18px,0);transition:opacity .9s var(--ease),transform .9s var(--ease)}
[data-fade].is-in{opacity:1;transform:none}

/* ---------- 4. Лоадер ---------- */
.loader{
  position:fixed;inset:0;z-index:200;
  background:var(--ink);
  display:flex;flex-direction:column;justify-content:flex-end;
  padding:var(--pad);
  transition:transform 1s var(--ease) .15s;
}
.loader.is-done{transform:translate3d(0,-101%,0)}
.loader__inner{display:flex;align-items:flex-end;justify-content:space-between;gap:24px}
.loader__label{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--fg-dim)}
.loader__num{
  font-size:clamp(4rem,16vw,14rem);font-weight:600;letter-spacing:-.05em;
  line-height:.8;font-variant-numeric:tabular-nums;
}
.loader__bar{height:1px;background:var(--line);margin-top:28px;overflow:hidden}
.loader__bar i{display:block;height:100%;width:0;background:var(--fg)}

/* ---------- 5. Курсор ---------- */
.cursor{position:fixed;top:0;left:0;z-index:300;pointer-events:none;mix-blend-mode:difference}
.cursor__dot,.cursor__ring{position:absolute;border-radius:50%;transform:translate(-50%,-50%)}
.cursor__dot{width:6px;height:6px;background:#fff}
.cursor__ring{
  width:36px;height:36px;border:1px solid rgba(255,255,255,.55);
  transition:width .3s var(--ease),height .3s var(--ease),background .3s var(--ease);
  display:grid;place-items:center;
  font-size:9px;letter-spacing:.1em;text-transform:uppercase;color:#fff;
}
.cursor.is-link .cursor__ring{width:56px;height:56px;background:rgba(255,255,255,.12)}
.cursor.is-view .cursor__ring{width:82px;height:82px;background:rgba(255,255,255,.14)}
.cursor.is-view .cursor__ring::after{content:"Смотреть"}
@media (hover:none),(pointer:coarse){.cursor{display:none}}

/* ---------- 6. Прогресс скролла ---------- */
.progress{
  position:fixed;top:0;left:0;height:2px;width:100%;z-index:120;
  background:var(--fg);transform:scaleX(0);transform-origin:0 50%;
  mix-blend-mode:difference;
}

/* ---------- 7. Шапка ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--nav-h);
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:0 var(--pad);
  color:#fff;
  mix-blend-mode:difference;   /* автоинверсия над светлыми секциями */
  transition:transform .5s var(--ease);
}
.nav.is-hidden{transform:translate3d(0,-100%,0)}
.nav__logo{display:flex;align-items:center;gap:10px;font-weight:600;letter-spacing:-.02em;font-size:15px}
.nav__logo sup{font-size:.55em;top:-.6em}
.nav__mark{
  width:11px;height:11px;border-radius:50%;background:currentColor;
  animation:pulse 3.2s var(--ease-io) infinite;
}
@keyframes pulse{0%,100%{transform:scale(1);opacity:1}50%{transform:scale(.55);opacity:.55}}

.nav__links{display:flex;gap:28px}
.nav__links a{
  font-size:13px;font-weight:450;display:block;
  height:1.3em;line-height:1.3em;overflow:hidden;
}
.nav__links a span{display:block;transition:transform .55s var(--ease)}
.nav__links a span::after{content:attr(data-t);display:block}
.nav__links a:hover span{transform:translateY(-50%)}
.nav__cta{
  border:1px solid currentColor;border-radius:999px;
  padding:9px 18px;font-size:13px;font-weight:500;
  transition:background .4s var(--ease),color .4s var(--ease);
  will-change:transform;
}
.nav__cta:hover{background:currentColor}
.nav__cta:hover span{filter:invert(1)}
.nav__burger{display:none;width:32px;height:32px;flex-direction:column;justify-content:center;gap:6px}
.nav__burger i{display:block;height:1.5px;background:currentColor;transition:transform .4s var(--ease)}
.nav__burger[aria-expanded="true"] i:first-child{transform:translateY(3.75px) rotate(45deg)}
.nav__burger[aria-expanded="true"] i:last-child{transform:translateY(-3.75px) rotate(-45deg)}

/* Мобильное меню */
.menu{
  position:fixed;inset:0;z-index:90;background:var(--ink);
  display:flex;flex-direction:column;justify-content:center;gap:8px;
  padding:var(--pad);
  clip-path:inset(0 0 100% 0);
  transition:clip-path .8s var(--ease);
  pointer-events:none;
}
.menu.is-open{clip-path:inset(0 0 0 0);pointer-events:auto}
.menu a{font-size:clamp(2rem,9vw,3.5rem);font-weight:600;letter-spacing:-.04em;overflow:hidden}
.menu a span{display:block;transform:translateY(110%);transition:transform .7s var(--ease)}
.menu.is-open a span{transform:none}
.menu.is-open a:nth-child(1) span{transition-delay:.10s}
.menu.is-open a:nth-child(2) span{transition-delay:.16s}
.menu.is-open a:nth-child(3) span{transition-delay:.22s}
.menu.is-open a:nth-child(4) span{transition-delay:.28s}
.menu.is-open a:nth-child(5) span{transition-delay:.34s}

/* ---------- 8. Hero ---------- */
.hero{
  min-height:100svh;
  padding:calc(var(--nav-h) + 24px) var(--pad) var(--pad);
  display:flex;flex-direction:column;justify-content:space-between;gap:48px;
  overflow:hidden;
}
.hero__bg{
  position:absolute;inset:-20% 0 -20% 0;z-index:-1;
  background:
    radial-gradient(60% 45% at 78% 12%,rgba(255,255,255,.10),transparent 70%),
    radial-gradient(50% 40% at 12% 88%,rgba(255,255,255,.06),transparent 70%),
    linear-gradient(180deg,#101012,#0a0a0b);
  will-change:transform;
}
.hero__top{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.hero__title{
  font-size:clamp(2.6rem,10.2vw,10rem);
  font-weight:600;letter-spacing:-.045em;line-height:.94;
  max-width:18ch;
}
.hero__bottom{display:flex;justify-content:space-between;align-items:flex-end;gap:32px;flex-wrap:wrap}
.hero__desc{font-size:clamp(.95rem,1.5vw,1.15rem);color:var(--fg-dim);max-width:44ch;line-height:1.45}
.scroll-hint{display:flex;align-items:center;gap:12px;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--fg-dim)}
.scroll-hint__track{width:26px;height:44px;border:1px solid var(--line);border-radius:999px;position:relative}
.scroll-hint__track i{
  position:absolute;left:50%;top:8px;width:3px;height:8px;border-radius:2px;background:var(--fg-dim);
  animation:wheel 2s var(--ease-io) infinite;
}
@keyframes wheel{0%{transform:translate(-50%,0);opacity:0}25%{opacity:1}100%{transform:translate(-50%,18px);opacity:0}}

/* ---------- 9. Бегущая строка ---------- */
.marquee{
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:22px 0;overflow:hidden;
}
.marquee__track{display:flex;width:max-content;will-change:transform}
.marquee__track span{
  font-size:clamp(1.6rem,4.4vw,3.4rem);font-weight:500;letter-spacing:-.03em;
  padding-right:.4em;white-space:nowrap;
}
.marquee__track i{font-style:normal;color:var(--fg-dim);padding:0 .18em;font-size:.5em;vertical-align:middle}

/* ---------- 10. Текст, проявляющийся по скроллу ---------- */
.intro{height:230vh;padding:0 var(--pad)}
.intro__sticky{
  position:sticky;top:0;height:100svh;
  display:flex;flex-direction:column;justify-content:center;gap:28px;
}
.intro__text{
  font-size:clamp(1.4rem,4.2vw,3.4rem);
  font-weight:500;letter-spacing:-.03em;line-height:1.2;max-width:20ch;
}
.intro__text .w{opacity:.14;transition:opacity .25s linear}
.intro__text .w.on{opacity:1}

/* ---------- 11. Цифры ---------- */
.stats{padding:clamp(72px,11vw,150px) var(--pad);border-top:1px solid var(--line-inv)}
.stats__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line-inv)}
.stat{background:var(--paper);padding:clamp(20px,3vw,40px) clamp(16px,2vw,28px);display:flex;flex-direction:column;gap:10px}
.stat b{
  font-size:clamp(2.4rem,6vw,5rem);font-weight:600;letter-spacing:-.05em;line-height:1;
  font-variant-numeric:tabular-nums;
}
.stat span{font-size:13px;color:var(--fg-inv-dim);max-width:18ch}

/* ---------- 12. Горизонтальный скролл ---------- */
.hscroll{height:400vh}
.hscroll__pin{
  position:sticky;top:0;height:100svh;overflow:hidden;
  display:flex;flex-direction:column;justify-content:center;gap:clamp(20px,4vh,44px);
  padding-top:var(--nav-h);
}
.hscroll__head{
  display:flex;justify-content:space-between;align-items:baseline;
  padding:0 var(--pad);
}
.hscroll__count{font-size:13px;color:var(--fg-dim);font-variant-numeric:tabular-nums}
.hscroll__count b{color:var(--fg);font-weight:600}
.hscroll__track{display:flex;gap:clamp(14px,2vw,28px);padding:0 var(--pad);will-change:transform}
.card{flex:0 0 clamp(260px,34vw,460px);display:flex;flex-direction:column;gap:16px}
.card__media{
  aspect-ratio:4/5;border-radius:var(--r);overflow:hidden;
  display:grid;place-items:center;
  font-size:clamp(2rem,5vw,4rem);font-weight:600;letter-spacing:-.04em;color:rgba(255,255,255,.32);
  transition:transform .7s var(--ease),filter .7s var(--ease);
}
.card:hover .card__media{transform:scale(1.02);filter:brightness(1.12)}
.card__meta h3{font-size:clamp(1rem,1.6vw,1.35rem);font-weight:550;letter-spacing:-.02em}
.card__meta p{font-size:13px;color:var(--fg-dim);margin-top:4px}

/* Нейтральные «изображения»-заглушки */
[data-tone]{background:linear-gradient(150deg,#2a2a2d,#161618 55%,#1f1f22)}
[data-tone="2"]{background:linear-gradient(150deg,#333336,#1b1b1e 60%,#28282b)}
[data-tone="3"]{background:linear-gradient(150deg,#242427,#3a3a3e 60%,#1a1a1c)}
[data-tone="4"]{background:linear-gradient(150deg,#3d3d41,#202023 55%,#2e2e31)}
[data-tone="5"]{background:linear-gradient(150deg,#1d1d20,#45454a 70%,#232326)}
[data-tone="6"]{background:linear-gradient(150deg,#cfcecb,#a9a8a4 55%,#dededa)}

/* ---------- 13. Стопка карточек ---------- */
.stack{padding:clamp(80px,12vw,170px) var(--pad) clamp(40px,8vw,120px)}
.stack__intro{display:flex;flex-direction:column;gap:18px;margin-bottom:clamp(32px,5vw,72px)}
.stack__list{display:flex;flex-direction:column;gap:22px}
.panel{
  position:sticky;
  top:calc(var(--nav-h) + 16px + var(--i) * 18px);
  background:var(--ink-2);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:clamp(22px,3.2vw,48px);
  display:grid;
  grid-template-columns:64px 1fr clamp(120px,16vw,240px);
  gap:clamp(18px,3vw,48px);
  align-items:start;
  min-height:clamp(280px,42vh,400px);
}
.panel__no{font-size:13px;color:var(--fg-dim);font-variant-numeric:tabular-nums;padding-top:6px}
.panel__body{display:flex;flex-direction:column;gap:14px}
.panel__body h3{font-size:clamp(1.4rem,3.2vw,2.6rem);font-weight:600;letter-spacing:-.035em;line-height:1.05}
.panel__body p{color:var(--fg-dim);max-width:52ch;font-size:clamp(.9rem,1.2vw,1.05rem)}
.panel__body ul{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.panel__body li{border:1px solid var(--line);border-radius:999px;padding:6px 13px;font-size:12px;color:var(--fg-dim)}
.panel__side{align-self:stretch;border-radius:calc(var(--r) - 4px);min-height:120px}

/* ---------- 14. Параллакс-блок ---------- */
.split{
  display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,5vw,80px);
  align-items:center;
  padding:clamp(80px,12vw,170px) var(--pad);
}
.split__media{aspect-ratio:4/5;border-radius:var(--r);overflow:hidden;position:relative}
.split__img{position:absolute;inset:-14% 0;will-change:transform}
.split__text{display:flex;flex-direction:column;gap:20px}
.split__text p{color:var(--fg-inv-dim);max-width:46ch;font-size:clamp(.95rem,1.3vw,1.1rem)}
.split__rows{display:flex;flex-direction:column;gap:0;margin-top:12px;border-top:1px solid var(--line-inv)}
.split__rows div{display:flex;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--line-inv);font-size:14px}
.split__rows b{font-weight:500}
.split__rows span{color:var(--fg-inv-dim)}

/* ---------- 15. FAQ ---------- */
.faq{padding:clamp(80px,12vw,170px) var(--pad);display:flex;flex-direction:column;gap:clamp(28px,4vw,56px)}
.faq__list{border-top:1px solid var(--line)}
.acc{border-bottom:1px solid var(--line)}
.acc summary{
  list-style:none;cursor:pointer;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:clamp(20px,2.6vw,34px) 0;
  font-size:clamp(1.05rem,2.4vw,1.9rem);font-weight:500;letter-spacing:-.025em;
  transition:opacity .4s var(--ease);
}
.acc summary::-webkit-details-marker{display:none}
.acc summary:hover{opacity:.6}
.acc summary i{position:relative;width:15px;height:15px;flex:0 0 auto}
.acc summary i::before,.acc summary i::after{
  content:"";position:absolute;left:0;top:7px;width:15px;height:1.5px;background:currentColor;
  transition:transform .45s var(--ease);
}
.acc summary i::after{transform:rotate(90deg)}
.acc[open] summary i::after{transform:rotate(0)}
.acc__body{overflow:hidden}
.acc__body p{color:var(--fg-dim);max-width:60ch;padding-bottom:clamp(20px,2.6vw,32px);font-size:clamp(.92rem,1.2vw,1.05rem)}
.acc[open] .acc__body{animation:accOpen .55s var(--ease)}
@keyframes accOpen{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}

/* ---------- 16. CTA ---------- */
.cta{
  min-height:76svh;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:clamp(28px,4vw,52px);padding:var(--pad);text-align:center;
  border-top:1px solid var(--line);
}
.cta__title{
  font-size:clamp(2.4rem,9vw,8rem);font-weight:600;letter-spacing:-.05em;line-height:.95;
}
.cta__title .ch{display:inline-block;opacity:0;transform:translateY(.5em) rotate(4deg);transition:opacity .6s var(--ease),transform .8s var(--ease)}
.cta__title.is-in .ch{opacity:1;transform:none}
.btn{
  border:1px solid var(--line);border-radius:999px;
  padding:16px 34px;font-size:clamp(.9rem,1.4vw,1.05rem);font-weight:500;
  transition:background .45s var(--ease),color .45s var(--ease),border-color .45s var(--ease);
  will-change:transform;
}
.btn:hover{background:var(--fg);color:var(--ink);border-color:var(--fg)}

/* ---------- 17. Подвал ---------- */
.footer{padding:clamp(32px,5vw,64px) var(--pad) 0;border-top:1px solid var(--line);overflow:hidden}
.footer__row{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;font-size:13px;color:var(--fg-dim)}
.footer__links{display:flex;gap:20px}
.footer__links a{transition:color .3s var(--ease)}
.footer__links a:hover{color:var(--fg)}
.footer__big{
  font-size:clamp(4rem,21vw,20rem);font-weight:600;letter-spacing:-.06em;line-height:.82;
  color:var(--fg);opacity:.07;margin-top:clamp(24px,4vw,48px);
  transform:translateY(14%);user-select:none;
}
.footer__big sup{font-size:.3em;top:-1.6em}

/* ---------- 18. Зерно ---------- */
.grain{
  position:fixed;inset:0;z-index:150;pointer-events:none;opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- 19. Адаптив ---------- */
@media (max-width:1024px){
  .split{grid-template-columns:1fr}
  .stats__grid{grid-template-columns:repeat(2,1fr)}
  .panel{grid-template-columns:48px 1fr;gap:20px}
  .panel__side{display:none}
}
@media (max-width:760px){
  :root{--nav-h:64px}
  .nav__links,.nav__cta{display:none}
  .nav__burger{display:flex}
  .hero{gap:36px}
  .hero__bottom{align-items:flex-start;flex-direction:column}
  .hscroll__track{gap:14px}
  .card{flex:0 0 76vw}
  .intro{height:190vh}
  .footer__row{flex-direction:column;gap:10px}
}

/* ---------- 20. Пониженная анимация ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
  .line__in{transform:none}
  .cta__title .ch{opacity:1;transform:none}
  .intro__text .w{opacity:1}
  .hscroll{height:auto}
  .hscroll__pin{position:static;height:auto;padding:clamp(60px,10vw,120px) 0}
  .hscroll__track{overflow-x:auto;transform:none!important;scroll-snap-type:x mandatory}
  .card{scroll-snap-align:start}
  .cursor,.grain{display:none}
}

/* ---------- 21. Бейдж возврата в хаб демо ---------- */
.demo-badge{
  position:fixed;left:50%;bottom:18px;z-index:110;
  transform:translateX(-50%);
  display:flex;align-items:center;gap:8px;
  padding:8px 14px 8px 10px;border-radius:999px;
  background:rgba(12,12,13,.72);border:1px solid rgba(255,255,255,.16);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  color:#eceae7;font-size:12px;letter-spacing:.01em;
  opacity:.42;transition:opacity .35s var(--ease),transform .35s var(--ease);
}
.demo-badge:hover{opacity:1;transform:translateX(-50%) translateY(-2px)}
.demo-badge b{font-weight:600}
.demo-badge i{font-style:normal;opacity:.55}
@media (max-width:760px){.demo-badge{bottom:14px;font-size:11px;padding:7px 12px 7px 9px}}