/* ии-бесплатно.рф — WOW-слой (redesign/CREATIVE.md, задача free-ai-wow, 26.09.2026).
   Progressive enhancement: без JS и при prefers-reduced-motion всё статично и читаемо.
   Начальные «скрытые» состояния — только под html.wow (ставит assets/wow.js). */
@view-transition{navigation:auto}
::view-transition-old(root),::view-transition-new(root){animation-duration:.2s}

/* Шапка: стекло + сжатие + прячется при скролле вниз */
header.top{transition:transform .45s var(--ease),box-shadow .3s,background .3s}
header.top .wrap{transition:height .35s var(--ease)}
header.top.is-scrolled{background:rgba(255,255,255,.9);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);box-shadow:0 10px 30px -18px rgba(14,14,14,.35)}
@media (min-width:981px){header.top.is-scrolled .wrap{height:60px}}
header.top.is-hidden{transform:translateY(-100%)}
header.top .logo-word{position:relative}
html.wow header.top .logo-word:after{content:"";position:absolute;inset:-4px -8px;border-radius:999px;box-shadow:0 0 0 0 rgba(46,219,115,.55);animation:free-pulse 2.4s var(--ease) 1 .6s;pointer-events:none}
@keyframes free-pulse{0%{box-shadow:0 0 0 0 rgba(46,219,115,.55)}100%{box-shadow:0 0 0 14px rgba(46,219,115,0)}}

/* Герой: нейро-поле (canvas) + слои параллакса */
.wow-field{position:absolute;inset:0;width:100%;height:100%;z-index:-1;pointer-events:none}
.hero-main .hero-media,.hero-main .hero-img,.hero-main .blob-r{will-change:transform}
.wow-chip{position:absolute;display:flex;align-items:center;gap:8px;padding:8px 14px;border-radius:999px;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);font:600 13px/1 T,sans-serif;box-shadow:var(--shadow);pointer-events:none;white-space:nowrap}
.wow-chip i{width:8px;height:8px;border-radius:50%}
.wow-chip.c1{left:8%;top:-22px}.wow-chip.c2{right:-18px;bottom:22%}.wow-chip.c3{left:34%;bottom:-18px}
@media (max-width:860px){.wow-chip{display:none}}
/* Маркер ключа в H1 — прорисовывается после заголовка */
html.wow .hero-col h1 .hl{background:none;position:relative;z-index:0}
html.wow .hero-col h1 .hl:before{content:"";position:absolute;left:0;right:0;top:58%;bottom:6%;background:var(--y);z-index:-1;transform:scaleX(0);transform-origin:left;transition:transform .9s var(--ease)}
html.wow .hero-col h1.hl-on .hl:before{transform:scaleX(1)}

/* Поиск: аура y→r→g вокруг поля при фокусе */
@property --aura{syntax:"<angle>";inherits:false;initial-value:0deg}
.search,.tool-box input,.tool-box textarea{position:relative}
.search:before,.wow-aura:before{content:"";position:absolute;inset:-4px;border-radius:inherit;z-index:-1;opacity:0;background:conic-gradient(from var(--aura),var(--y),var(--r),var(--g),var(--y));filter:blur(6px);transition:opacity .35s var(--ease)}
.search:focus-within:before,.wow-aura:focus-within:before{opacity:1;animation:aura-spin 6s linear infinite}
@keyframes aura-spin{to{--aura:360deg}}
.wow-aura{position:relative;display:block;border-radius:18px;isolation:isolate}

/* Горизонтальная лента популярных нейросетей */
.hs-bar{display:none;height:4px;border-radius:4px;margin-top:28px;background:var(--line);overflow:hidden}
.hs-bar i{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:left;background:linear-gradient(90deg,var(--y),var(--r),var(--g))}
.hs-on .hs-bar{display:block}
.hs-hint{margin:14px 0 0;font-size:15px;font-weight:600;color:var(--muted);transition:opacity .4s var(--ease)}
.hs-hint span{display:inline-block;color:var(--r);animation:hint-nudge 1.4s var(--ease) infinite}
.hs-hint.off{opacity:0}
@keyframes hint-nudge{50%{transform:translateX(6px)}}
.hs-on{overflow:hidden;min-height:100vh;display:grid;align-content:center}
.hs-on>.wrap{width:100%}
.hs-on .ai-list{display:flex;flex-wrap:nowrap;width:max-content;gap:18px}
.hs-on .ai-item{width:340px;flex:0 0 340px;min-height:200px;padding:26px}
.hs-on .ai-item .mono{width:64px;height:64px;font-size:22px;border-radius:18px}
@media (max-width:767px){
  .ai-list{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;gap:12px;margin:0 calc(-1*clamp(20px,4vw,40px));padding:4px clamp(20px,4vw,40px) 12px;scrollbar-width:none}
  .ai-list::-webkit-scrollbar{display:none}
  .ai-list .ai-item{flex:0 0 82%;scroll-snap-align:start}
}

/* Pinned «Как это работает» — тёмная сцена */
.how{background:var(--k);color:#fff;position:relative;overflow:clip}
.how:before{content:"";position:absolute;width:520px;height:520px;border-radius:50%;background:var(--r);filter:blur(140px);opacity:.18;right:-160px;top:10%;pointer-events:none}
.how h2{color:#fff}.how .eyebrow{color:#bdbdb8}
.how-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,80px);align-items:start}
.how-screen{position:sticky;top:clamp(90px,14vh,140px);aspect-ratio:4/3;border-radius:var(--radius);background:#fff;box-shadow:0 0 0 1px rgba(255,255,255,.08),0 40px 80px -30px rgba(0,0,0,.6);overflow:hidden;isolation:isolate}
.hw-scene{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
html.wow .hw-scene{opacity:0;transform:scale(1.08);transition:opacity .7s var(--ease),transform 1.2s var(--ease)}
html.wow .hw-scene.on{opacity:1;transform:none}
html:not(.wow) .hw-scene:not(:first-child){display:none}
.hw-count{position:absolute;left:18px;top:16px;z-index:2;padding:8px 14px;border-radius:999px;background:var(--k);color:#bdbdb8;font:600 15px/1 T,sans-serif;font-variant-numeric:tabular-nums}
.hw-count b{color:#fff}
.hw-prog{position:absolute;left:0;right:0;bottom:0;height:4px;z-index:2;background:rgba(14,14,14,.08)}
.hw-prog i{display:block;height:100%;transform:scaleX(.3333);transform-origin:left;background:linear-gradient(90deg,var(--y),var(--r),var(--g));transition:transform .6s var(--ease)}
.how-steps{list-style:none;margin:0;padding:0;counter-reset:s}
.how-step{min-height:clamp(260px,60vh,520px);display:flex;flex-direction:column;justify-content:center;padding:24px 0;transition:opacity .5s var(--ease)}
html.wow .how-step{opacity:.35}
html.wow .how-step.on{opacity:1}
.how-step .num{font:700 clamp(48px,6vw,88px)/1 D,T,sans-serif;letter-spacing:-.04em;color:var(--y);font-variant-numeric:tabular-nums;margin-bottom:10px;display:flex;align-items:center;gap:16px}
.how-step:nth-child(2) .num{color:var(--r)}.how-step:nth-child(3) .num{color:var(--g)}
.how-step h3{font:700 clamp(22px,2.4vw,32px)/1.15 D,T,sans-serif;color:#fff;letter-spacing:-.02em}
.how-step p{color:#bdbdb8;max-width:440px;margin:0}
html.wow .how-check path{stroke-dasharray:40;stroke-dashoffset:40;transition:stroke-dashoffset .7s var(--ease) .15s}
.how-step.on .how-check path,.hw-scene.on .how-check path{stroke-dashoffset:0}
@media (max-width:860px){
  .how-grid{grid-template-columns:1fr}
  .how-screen{position:sticky;top:76px;z-index:1;max-width:520px;width:100%;aspect-ratio:4/3}
  .how-step{min-height:62vh}
}

/* Карточки: tilt + spotlight */
.wow-tilt{transform-style:preserve-3d;will-change:transform}
.wow-spot:after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;opacity:0;transition:opacity .3s;background:radial-gradient(420px circle at var(--mx,50%) var(--my,50%),rgba(255,210,31,.22),rgba(255,75,62,.08) 40%,transparent 65%);z-index:2}
.wow-spot:hover:after{opacity:1}
.card-dark.wow-spot:after,.agents-band.wow-spot:after{mix-blend-mode:screen}

/* Обложки: clip-path reveal */
html.wow .wow-clip{clip-path:inset(100% 0 0 0)}
html.wow .wow-clip.in-clip{clip-path:inset(0 0 0 0);transition:clip-path 1.1s var(--ease)}

/* CTA-полоса: живой градиент */
.agents-band:after{content:"";position:absolute;width:60%;aspect-ratio:1;border-radius:50%;left:20%;top:-30%;background:conic-gradient(from 0deg,var(--y),var(--r),var(--g),var(--y));filter:blur(120px);opacity:.16;pointer-events:none;z-index:0;animation:band-drift 14s ease-in-out infinite alternate}
@keyframes band-drift{from{transform:translate(-20%,0) rotate(0)}to{transform:translate(20%,20%) rotate(180deg)}}

/* FAQ: плавный аккордеон (Chrome 131+; остальные — мгновенно) */
@supports (interpolate-size:allow-keywords){
  :root{interpolate-size:allow-keywords}
  details.faq-item::details-content{block-size:0;overflow:clip;transition:block-size .4s var(--ease),content-visibility .4s allow-discrete}
  details.faq-item[open]::details-content{block-size:auto}
}

/* Кастомный курсор (только мышь) */
.wow-cur,.wow-ring{position:fixed;left:0;top:0;pointer-events:none;z-index:9999;border-radius:50%;transform:translate(-50%,-50%)}
.wow-cur{width:8px;height:8px;background:var(--r)}
.wow-ring{width:36px;height:36px;box-shadow:inset 0 0 0 1.5px rgba(14,14,14,.35);transition:width .25s var(--ease),height .25s var(--ease),box-shadow .25s}
.wow-ring.big{width:64px;height:64px;box-shadow:inset 0 0 0 1.5px var(--r)}

/* Статья: прогресс чтения и активный пункт оглавления */
.wow-progress{position:fixed;left:0;right:0;top:0;height:3px;z-index:40;transform:scaleX(0);transform-origin:left;background:linear-gradient(90deg,var(--y),var(--r),var(--g));pointer-events:none}
.toc-desktop a.is-active{color:var(--k);font-weight:600}
.toc-desktop li{position:relative}
.toc-desktop li:has(a.is-active):before{content:"";position:absolute;left:-18px;top:0;bottom:0;width:2px;background:var(--r)}

/* Раздел: мини-поле частиц за героем */
.hero.has-field{position:relative;overflow:hidden;isolation:isolate}
.hub-hero-img{will-change:transform}

@media (prefers-reduced-motion:reduce){
  .wow-field,.wow-cur,.wow-ring,.wow-progress{display:none}
  .hs-hint span,.agents-band:after,.search:focus-within:before,.wow-aura:focus-within:before{animation:none}
  header.top.is-hidden{transform:none}
  html.wow .wow-clip{clip-path:none}
  html.wow .how-step{opacity:1}
  html.wow .how-check path{stroke-dashoffset:0}
  .hw-scene{transition:none!important}
}