/* vi-utkina.ru — хаб-сайт. Вёрстка без фреймворков. Токены + светлая/тёмная тема. */
:root{
  --accent:#5b4dff; --accent-2:#8a7bff;
  --bg:#ffffff; --paper:#f6f5fb; --card:#ffffff; --line:#e7e4f4;
  --ink:#14112e; --ink-soft:#57536f;
  --accent-soft:#eceafd; --accent-ink:#241d63;
  --panel:#14112e; --panel-ink:#f4f2fb; --panel-soft:#b7b2d0; --panel-line:rgba(255,255,255,.10);
  --logo-ink:#9b97ad; --ok:#0e9f6e;
  --tag-strat:#5b4dff; --tag-ai:#0ea5b7; --tag-edu:#e0762f; --tag-launch:#c2378f;
  --shadow:0 14px 44px rgba(20,17,46,.10);
  --header-bg:rgba(255,255,255,.9);
  --radius:20px; --maxw:1280px;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#100d26; --paper:#171232; --card:#1d1940; --line:#2c2850;
    --ink:#f2f0fb; --ink-soft:#aba6c8;
    --accent:#8f81ff; --accent-2:#a99cff; --accent-soft:rgba(143,129,255,.15); --accent-ink:#cbc4ff;
    --panel:#241f4a; --panel-ink:#f4f2fb; --panel-soft:#b7b2d0; --panel-line:rgba(255,255,255,.10);
    --logo-ink:#8b86a6;
    --shadow:0 16px 46px rgba(0,0,0,.5);
    --header-bg:rgba(16,13,38,.86);
  }
}
:root[data-theme="light"]{
  --bg:#ffffff; --paper:#f6f5fb; --card:#ffffff; --line:#e7e4f4;
  --ink:#14112e; --ink-soft:#57536f; --accent:#5b4dff; --accent-2:#8a7bff;
  --accent-soft:#eceafd; --accent-ink:#241d63;
  --panel:#14112e; --panel-ink:#f4f2fb; --panel-soft:#b7b2d0;
  --logo-ink:#9b97ad; --shadow:0 14px 44px rgba(20,17,46,.10); --header-bg:rgba(255,255,255,.9);
}
:root[data-theme="dark"]{
  --bg:#100d26; --paper:#171232; --card:#1d1940; --line:#2c2850;
  --ink:#f2f0fb; --ink-soft:#aba6c8; --accent:#8f81ff; --accent-2:#a99cff;
  --accent-soft:rgba(143,129,255,.15); --accent-ink:#cbc4ff;
  --panel:#241f4a; --panel-ink:#f4f2fb; --panel-soft:#b7b2d0;
  --logo-ink:#8b86a6; --shadow:0 16px 46px rgba(0,0,0,.5); --header-bg:rgba(16,13,38,.86);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Montserrat',system-ui,-apple-system,sans-serif;font-weight:500;color:var(--ink);background:var(--bg);line-height:1.6;font-size:17px;-webkit-font-smoothing:antialiased;transition:background .25s ease,color .25s ease}
img{max-width:100%;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
section{padding:92px 0}
h1,h2,h3{line-height:1.14;font-weight:800;letter-spacing:-.01em;text-wrap:balance}
h2{font-size:clamp(27px,3.6vw,40px);margin-bottom:30px}
.kicker{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:14px}
.muted{color:var(--ink-soft)}
.btn{display:inline-flex;align-items:center;gap:9px;padding:16px 30px;border-radius:14px;font-weight:700;font-size:15.5px;transition:transform .15s ease,box-shadow .15s ease;cursor:pointer;border:none}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;box-shadow:0 10px 26px color-mix(in srgb,var(--accent) 38%,transparent)}
.btn-outline{border:2px solid var(--ink);color:var(--ink);background:transparent}
.btn-white{background:#fff;color:#241d63}

/* reveal on scroll */
.rv{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}}

/* ───────── header ───────── */
.site-header{position:sticky;top:0;z-index:50;background:var(--header-bg);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:70px;gap:18px}
.logo{font-weight:800;font-size:17px;color:var(--ink);letter-spacing:-.01em}
.logo:hover{text-decoration:none}
.logo span{color:var(--accent)}
.nav{display:flex;gap:28px;align-items:center;margin-left:auto}
.nav a{color:var(--ink-soft);font-weight:600;font-size:15px;transition:color .15s}
.nav a:hover{color:var(--ink);text-decoration:none}
.theme-btn{border:1px solid var(--line);background:transparent;color:var(--ink-soft);border-radius:11px;width:40px;height:40px;cursor:pointer;font-size:16px;flex:none;transition:.15s}
.theme-btn:hover{color:var(--accent);border-color:var(--accent)}
.burger{display:none;background:none;border:none;width:40px;height:40px;cursor:pointer;position:relative;flex:none}
.burger i,.burger i::before,.burger i::after{content:'';position:absolute;left:8px;width:24px;height:2px;background:var(--ink);transition:.2s}
.burger i{top:19px}
.burger i::before{top:-7px}
.burger i::after{top:7px}

/* ───────── hero ───────── */
.hero{background:radial-gradient(1100px 560px at 84% -8%,color-mix(in srgb,var(--accent) 14%,transparent),transparent 60%),var(--bg);padding:58px 0 0;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.06fr .94fr;gap:40px;align-items:end}
.hero-grid>div:first-child{padding-bottom:60px}
.hero h1{font-size:clamp(34px,4.6vw,56px);margin:14px 0 24px;max-width:660px}
.hero .role{font-size:clamp(17px,1.8vw,20px);font-weight:500;color:var(--ink-soft);line-height:1.5;margin-bottom:28px;max-width:560px}
.hero .role .role-for{color:var(--ink);font-weight:700}
.scope{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:34px}
.chip{border:1px solid var(--line);background:var(--card);border-radius:999px;padding:9px 16px;font-size:13.5px;font-weight:600;color:var(--ink);transition:.15s}
.chip:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px);text-decoration:none}
.hero-figure{position:relative;min-height:520px;align-self:stretch}
.hero-figure img{position:absolute;bottom:0;right:0;max-height:640px;width:auto;
  -webkit-mask-image:linear-gradient(to bottom,#000 84%,transparent 99%),linear-gradient(to right,transparent 0,#000 12%,#000 92%,transparent 100%);
  mask-image:linear-gradient(to bottom,#000 84%,transparent 99%),linear-gradient(to right,transparent 0,#000 12%,#000 92%,transparent 100%);
  -webkit-mask-composite:source-in;mask-composite:intersect}

/* manifest */
.manifest{background:linear-gradient(135deg,var(--panel),color-mix(in srgb,var(--panel) 82%,var(--accent)));color:var(--panel-ink);margin-top:8px}
.manifest .wrap{padding:74px 28px}
.manifest p{font-size:clamp(23px,3vw,36px);font-weight:800;line-height:1.28;max-width:1000px}
.manifest p em{font-style:normal;color:var(--accent-2)}

/* logos */
.logos{padding:44px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.logos .wrap{text-align:center}
.logos-label{font-size:12.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-soft);margin-bottom:22px}
.logos-row{display:flex;flex-wrap:wrap;gap:16px 32px;align-items:center;justify-content:center}
.logos span{font-weight:700;font-size:16px;color:var(--logo-ink);letter-spacing:.02em;white-space:nowrap}

/* ───────── результаты (стрелочный список) ───────── */
.probs{display:grid;grid-template-columns:1fr 1fr;gap:0 56px}
.prob{display:grid;grid-template-columns:auto 1fr;gap:16px;padding:24px 0;border-top:1px solid var(--line);align-items:start}
.prob .mk{color:var(--accent);font-size:20px;line-height:1.3}
.prob b{display:block;font-weight:800;font-size:17px;margin-bottom:4px;color:var(--ink)}
.prob p{color:var(--ink-soft);font-size:15.5px}

/* ───────── продукты ───────── */
.products-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.product-card{background:var(--paper);border:1px solid transparent;border-radius:22px;padding:34px;display:flex;flex-direction:column;gap:13px;transition:transform .18s ease,box-shadow .18s ease,border-color .18s;color:var(--ink)}
.product-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);text-decoration:none;border-color:var(--line);background:var(--card)}
.product-card .num{width:46px;height:46px;border-radius:13px;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;letter-spacing:0}
.product-card h3{font-size:20px}
.product-card p{color:var(--ink-soft);font-size:15px;flex:1}
.product-card .go{font-weight:700;color:var(--accent);font-size:14.5px}

/* ───────── кейсы: плитка ───────── */
.cases-band{background:linear-gradient(150deg,#241d63 0%,#4a3ac9 55%,#5b4dff 100%);color:#fff}
.cases-band h2{color:#fff}
.cases-band .kicker{color:#c3b9ff}
.cases-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.case-tile{background:var(--card);border-radius:18px;padding:24px;color:var(--ink);display:flex;flex-direction:column;gap:10px;min-height:170px;transition:transform .16s ease,box-shadow .16s ease;position:relative}
.case-tile:hover{transform:translateY(-4px);text-decoration:none;box-shadow:var(--shadow)}
.case-tile .tag{align-self:flex-start}
.case-tile .client{font-weight:800;font-size:16.5px;line-height:1.25}
.case-tile .arrow{margin-top:auto;font-weight:800;color:var(--accent);font-size:20px}
.case-tile.tile-cta{background:var(--panel);color:var(--panel-ink);justify-content:center;align-items:flex-start;font-weight:800;font-size:17px}
.case-tile.tile-cta .arrow{color:var(--accent-2)}
/* плитки на фиолетовой ленте — фиксированные цвета (лента одинакова в обеих темах) */
.cases-band .case-tile{background:#fff;color:#14112e}
.cases-band .case-tile .client{color:#14112e}
.cases-band .case-tile .arrow{color:#5b4dff}
.cases-band .case-tile.tile-cta{background:#14112e;color:#fff}
.cases-band .case-tile.tile-cta .arrow{color:#a99cff}
.tag{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;padding:5px 11px;border-radius:999px;color:#fff}
.tag-strat{background:var(--tag-strat)}
.tag-ai{background:var(--tag-ai)}
.tag-edu{background:var(--tag-edu)}
.tag-launch{background:var(--tag-launch)}

/* ───────── кейсы: хаб /cases ───────── */
.filter-bar{display:flex;flex-wrap:wrap;gap:10px;margin:6px 0 34px}
.filter-btn{border:2px solid var(--line);background:var(--card);color:var(--ink);border-radius:999px;padding:9px 20px;font-weight:700;font-size:14px;cursor:pointer;font-family:inherit}
.filter-btn.active{background:var(--panel);border-color:var(--panel);color:var(--panel-ink)}
.cases-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.case-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;display:flex;flex-direction:column;gap:12px;box-shadow:0 4px 18px rgba(20,17,46,.05)}
.case-card .client{font-weight:800;font-size:18px}
.case-card .task{color:var(--ink-soft);font-size:15px;flex:1}
.case-card .figure{font-size:26px;font-weight:800;color:var(--accent);line-height:1.2}
.case-card .figure small{display:block;font-size:13px;font-weight:600;color:var(--ink-soft);margin-top:4px}
.case-card .go{font-weight:700}

/* ───────── страница кейса ───────── */
.case-hero{background:var(--paper);padding:56px 0 44px}
.case-hero h1{font-size:clamp(28px,3.6vw,42px);max-width:900px;margin:12px 0 26px}
.case-meta{max-width:760px;margin-top:8px;border-top:1px solid var(--line)}
.case-meta .meta-row{display:grid;grid-template-columns:150px 1fr;gap:28px;align-items:baseline;padding:15px 0;border-bottom:1px solid var(--line)}
.case-meta .meta-row b{font-size:11.5px;text-transform:uppercase;letter-spacing:.13em;color:var(--ink-soft);font-weight:700}
.case-meta .meta-row span{font-size:16.5px;color:var(--ink);font-weight:500}
@media(max-width:560px){.case-meta .meta-row{grid-template-columns:1fr;gap:5px;padding:13px 0}}
.case-body{max-width:820px}
.case-body h2{font-size:24px;margin:44px 0 16px}
.case-body p{color:var(--ink)}
.case-body ul,.case-body ol{padding-left:22px;display:grid;gap:8px;margin:12px 0;color:var(--ink)}
.shot{margin:34px 0}
.shot img{width:100%;border-radius:16px;border:1px solid var(--line);box-shadow:0 8px 30px rgba(20,17,46,.08)}
.shot figcaption{font-size:13.5px;color:var(--ink-soft);margin-top:12px;line-height:1.5}
.case-quote{background:var(--paper);border-left:5px solid var(--accent);border-radius:0 var(--radius) var(--radius) 0;padding:26px 30px;margin:40px 0;font-size:17px}
.case-quote .author{margin-top:12px;font-weight:700;font-size:15px;color:var(--ink-soft)}
.result-numbers{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin:20px 0}
.rn{background:var(--accent-soft);border-radius:16px;padding:22px}
.rn b{display:block;font-size:26px;font-weight:800;color:var(--accent-ink);line-height:1.15;font-variant-numeric:tabular-nums}
.rn span{font-size:13.5px;color:var(--ink-soft);font-weight:600}
.steps{display:grid;gap:0;margin:16px 0}
.step{display:grid;grid-template-columns:56px 1fr;gap:18px;padding:18px 0;border-bottom:1px solid var(--line)}
.step:last-child{border-bottom:none}
.step .n{width:40px;height:40px;border-radius:12px;background:var(--panel);color:var(--panel-ink);font-weight:800;display:flex;align-items:center;justify-content:center;font-size:16px}
.step h3{font-size:17px;margin-bottom:4px}
.step p{color:var(--ink-soft);font-size:15.5px}
.related{background:var(--paper)}
.cta-band{background:var(--panel);color:var(--panel-ink);text-align:center}
.cta-band h2{color:var(--panel-ink);margin-bottom:14px}
.cta-band p{color:var(--panel-soft);max-width:560px;margin:0 auto 30px}

/* ───────── продуктовая страница ───────── */
.product-hero{background:var(--paper);padding:56px 0 48px}
.product-hero h1{font-size:clamp(30px,4vw,46px);max-width:880px;margin:12px 0 20px}
.product-hero .lead{max-width:760px;font-size:18px;color:var(--ink-soft)}
.term-chip{display:inline-flex;gap:8px;align-items:center;background:var(--card);border:2px solid var(--accent-soft);color:var(--ink);padding:10px 18px;border-radius:999px;font-weight:700;font-size:14.5px;margin-top:24px}
.deliver-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.deliver{background:var(--paper);border-radius:16px;padding:24px}
.deliver b{display:block;margin-bottom:6px;color:var(--ink)}
.deliver p{font-size:14.5px;color:var(--ink-soft)}
.boundary{background:var(--accent-soft);border-radius:var(--radius);padding:30px 34px;display:grid;grid-template-columns:auto 1fr;gap:20px;align-items:center;margin-top:56px}
.boundary .mark{font-size:30px;color:var(--accent)}
.boundary p{font-size:15.5px;color:var(--ink)}

/* ───────── книга ───────── */
.book{background:var(--paper)}
.book-grid{display:grid;grid-template-columns:230px 1fr;gap:48px;align-items:center}
.book-cover{border-radius:12px;box-shadow:var(--shadow)}
.book h2{margin-bottom:12px}
.book .imprint{font-weight:700;color:var(--ink-soft);margin-bottom:16px;font-size:15px}
.book p.desc{max-width:640px;margin-bottom:26px;color:var(--ink-soft)}

/* ───────── цифровой след ───────── */
.verify-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.verify-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:28px}
.verify-card h3{font-size:12.5px;text-transform:uppercase;letter-spacing:.09em;color:var(--ink-soft);margin-bottom:14px;font-weight:700}
.verify-card ul{list-style:none;display:grid;gap:11px}
.verify-card li{font-size:15px;color:var(--ink)}
.verify-card a{font-weight:600;word-break:break-word}
.ext::after{content:' ↗';font-size:12px}

/* ───────── безопасность / формат ───────── */
.work-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px;margin-bottom:34px}
.work-item{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;font-weight:600;font-size:15px;color:var(--ink)}
.work-item .tick{color:var(--ok);font-weight:800;margin-right:8px}
.security{background:var(--panel);color:var(--panel-ink);border-radius:var(--radius);padding:36px 40px}
.security h3{font-size:20px;margin-bottom:12px}
.security p{color:var(--panel-soft);font-size:15.5px;max-width:860px}
.security .layers{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:22px}
.security .layer{background:var(--panel-line);border-radius:14px;padding:18px}
.security .layer b{display:block;margin-bottom:6px;color:var(--accent-2)}
.security .layer span{font-size:14px;color:var(--panel-soft)}

/* ───────── обо мне ───────── */
.about{background:var(--paper)}
.about-grid{display:grid;grid-template-columns:230px 1fr;gap:52px;align-items:start}
.about-photo{border-radius:var(--radius);filter:grayscale(1);box-shadow:var(--shadow)}
.about-intro{font-size:17px;color:var(--ink);max-width:640px;line-height:1.6;margin-bottom:30px}
.about-block{margin-bottom:30px}
.about-block h3{font-size:19px;margin-bottom:12px}
.about-block ul{list-style:none;display:grid;gap:9px}
.about-block li{padding-left:22px;position:relative;color:var(--ink-soft)}
.about-block li::before{content:'—';position:absolute;left:0;color:var(--accent)}
.stats-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin:26px 0}
.stat{background:var(--card);border:1px solid var(--line);border-radius:15px;padding:18px}
.stat b{display:block;font-size:24px;font-weight:800;color:var(--accent);font-variant-numeric:tabular-nums}
.stat span{font-size:13px;color:var(--ink-soft);font-weight:600}

/* ───────── контакт и футер ───────── */
.contact{text-align:center}
.contact .links{display:flex;gap:18px;justify-content:center;flex-wrap:wrap;margin-top:26px}
.site-footer{background:var(--panel);color:var(--panel-soft);padding:44px 0;font-size:14px}
.site-footer .wrap{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.site-footer a{color:color-mix(in srgb,var(--panel-ink) 82%,transparent)}
.site-footer ul{list-style:none;display:grid;gap:8px}
.site-footer .fin{line-height:1.8}

/* ───────── responsive ───────── */
@media(max-width:960px){
  .hero-grid{grid-template-columns:1fr}
  .hero-figure{display:none}
  .hero-grid>div:first-child{padding-bottom:40px}
  .products-grid{grid-template-columns:1fr}
  .probs{grid-template-columns:1fr;gap:0}
  .cases-grid{grid-template-columns:repeat(2,1fr)}
  .cases-cards{grid-template-columns:repeat(2,1fr)}
  .verify-grid{grid-template-columns:1fr}
  .book-grid{grid-template-columns:160px 1fr;gap:28px}
  .about-grid{grid-template-columns:1fr}
  .about-photo{max-width:210px}
  .security .layers{grid-template-columns:1fr}
  .site-footer .wrap{grid-template-columns:1fr}
}
@media(max-width:680px){
  body{font-size:16px}
  section{padding:60px 0}
  .nav{display:none;position:absolute;top:70px;left:0;right:0;background:var(--bg);flex-direction:column;padding:22px;border-bottom:1px solid var(--line);gap:18px;margin-left:0}
  .nav.open{display:flex}
  .burger{display:block}
  .cases-grid{grid-template-columns:1fr}
  .cases-cards{grid-template-columns:1fr}
  .book-grid{grid-template-columns:1fr}
  .book-cover{max-width:180px}
  .boundary{grid-template-columns:1fr}
}