/* Aivitel — main stylesheet */
:root{
  --ink:#111114; --ink-2:#1C1C22; --ink-line:#34343C; --ink-soft:#2C2C33;
  --paper:#FFFFFF; --soft:#F3F3F0; --line:#E2E2DC; --field:#CFCFC8;
  --text-2:#3A3A40; --muted:#5B5B60; --on-dark:#C9C9CF; --on-dark-2:#E4E4E8; --on-dark-3:#A9A9B0;
  --accent:#FF5A26; --accent-hover:#FF7A4D; --accent-text:#C2360B;
  --radius:20px; --wrap:1240px;
  --font:'Onest',system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:'JetBrains Mono',ui-monospace,Menlo,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--ink)}a:hover{color:var(--accent-text)}
h1,h2,h3{margin:0}
p{margin:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.skip{position:absolute;left:-9999px;top:8px;background:var(--ink);color:#fff;padding:10px 16px;border-radius:8px;z-index:100}
.skip:focus{left:16px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 32px}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 26px;border-radius:999px;font-weight:700;font-size:16px;text-decoration:none;cursor:pointer;border:0;font-family:inherit;transition:background .15s,color .15s}
.btn svg{width:18px;height:18px}
.btn-sm{min-height:44px;padding:0 20px;font-size:15px}
.btn-dark{background:var(--ink);color:#fff}.btn-dark:hover{background:var(--ink-soft);color:#fff}
.btn-line{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}.btn-line:hover{background:var(--ink);color:#fff}
.btn-accent{background:var(--accent);color:var(--ink)}.btn-accent:hover{background:var(--accent-hover);color:var(--ink)}

/* Header */
.header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-row{display:flex;align-items:center;justify-content:space-between;height:76px;gap:24px}
.logo img{height:40px;width:auto}
.nav{display:flex;gap:28px;align-items:center}
.nav a{text-decoration:none;font-weight:600;font-size:15px}
.header-right{display:flex;align-items:center;gap:14px}
.langs{display:flex;gap:2px}
.langs a{font-size:13px;font-weight:600;text-decoration:none;color:var(--muted);padding:7px 8px;border-radius:8px;min-height:32px}
.langs a[aria-current="true"]{background:var(--ink);color:#fff}
.burger{display:none;width:44px;height:44px;border:1.5px solid var(--ink);border-radius:12px;background:#fff;align-items:center;justify-content:center;cursor:pointer}
.mobile-nav{display:none;flex-direction:column;padding:8px 16px 20px;gap:4px;border-top:1px solid var(--line)}
.mobile-nav a{text-decoration:none;font-weight:600;padding:12px 0}
.mobile-nav .btn{margin-top:8px}
.mobile-nav .langs{padding-top:8px}

/* Shared section bits */
.section{padding:104px 0}
.section-head{display:flex;flex-direction:column;gap:14px;max-width:760px}
.section-head-row{display:flex;justify-content:space-between;align-items:flex-end;gap:32px;flex-wrap:wrap}
.eyebrow{font-family:var(--mono);font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent-text)}
.h2{font-size:48px;line-height:1.08;letter-spacing:-.025em;font-weight:800}
.stack-40{display:flex;flex-direction:column;gap:40px}
.lead{font-size:18px;line-height:1.6;color:var(--text-2)}

/* Hero */
.hero{padding:88px 0 72px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:56px;align-items:center}
.hero-copy{display:flex;flex-direction:column;gap:28px}
.kicker{font-family:var(--mono);font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);display:flex;align-items:center;gap:10px}
.dot{width:10px;height:10px;border-radius:50%;background:var(--accent);display:inline-block}
.h1{font-size:64px;line-height:1.02;letter-spacing:-.03em;font-weight:800}
.hero-sub{font-size:20px;line-height:1.55;color:var(--text-2);max-width:560px}
.btn-row{display:flex;gap:14px;flex-wrap:wrap}
.hero-visual{position:relative;padding:36px}
.bracket{position:absolute;width:120px;height:120px;border:0 solid var(--ink)}
.bracket-tl{left:0;top:0;border-left-width:12px;border-top-width:12px;border-top-left-radius:40px}
.bracket-br{right:0;bottom:0;border-right-width:12px;border-bottom-width:12px;border-bottom-right-radius:40px}
.hero-cards{display:flex;flex-direction:column;gap:12px;position:relative}
.hero-card{text-decoration:none;color:var(--ink);background:var(--soft);border-radius:18px;padding:18px 22px;display:flex;align-items:center;gap:18px}
.hero-card:hover{color:var(--ink);background:#EAEAE5}
.hero-card:nth-child(2){margin-left:24px}
.hero-card:nth-child(3){margin-left:48px}
.hero-card.dark{margin-left:72px;background:var(--ink);color:#fff}
.hero-card.dark:hover{background:var(--ink-soft);color:#fff}
.hero-card .ico{width:48px;height:48px;border-radius:14px;background:var(--ink);display:flex;align-items:center;justify-content:center;flex:none}
.hero-card.dark .ico{background:var(--accent)}
.hero-card .ico svg{width:24px;height:24px}
.hero-card strong{font-size:18px;display:block}
.hero-card span.sub{font-size:15px;color:var(--muted)}
.hero-card.dark span.sub{color:var(--on-dark)}
.badge{font-family:var(--mono);font-size:11px;background:var(--accent);color:var(--ink);padding:3px 7px;border-radius:6px;margin-left:6px;vertical-align:middle}

/* Stats */
.stats-band{border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.stats{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));margin:0 auto}
.stat{padding:32px 20px;display:flex;flex-direction:column-reverse;justify-content:flex-end;gap:6px;margin:0}
.stat:first-child{padding-left:0}
.stat dd{margin:0;white-space:nowrap;font-size:36px;font-weight:700;letter-spacing:-.02em;line-height:1.1}
.stat dt{font-size:15px;color:var(--muted)}

/* Services */
.svc-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.svc-card{text-align:left;cursor:pointer;font:inherit;color:inherit;background:#fff;border:1.5px solid var(--line);border-radius:var(--radius);padding:28px;display:flex;flex-direction:column;gap:14px;min-height:240px;transition:border-color .15s,box-shadow .15s}
.svc-card:hover{border-color:var(--ink)}
.svc-card[aria-selected="true"]{border-color:var(--ink);box-shadow:0 0 0 1.5px var(--ink)}
.svc-num{font-family:var(--mono);font-size:13px;color:var(--muted)}
.svc-title{font-size:26px;line-height:1.15;letter-spacing:-.01em;font-weight:700}
.svc-lead{font-size:16px;line-height:1.5;color:var(--text-2)}
.svc-more{margin-top:auto;font-size:15px;font-weight:700;color:var(--accent-text)}
.svc-more .on{display:none}
.svc-card[aria-selected="true"] .svc-more .off{display:none}
.svc-card[aria-selected="true"] .svc-more .on{display:inline}
.svc-panel{background:var(--soft);border-radius:24px;padding:40px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:40px}
.svc-panel[hidden]{display:none}
.svc-panel-copy{display:flex;flex-direction:column;gap:16px;align-items:flex-start}
.svc-panel h3{font-size:30px;letter-spacing:-.015em}
.svc-panel p{font-size:17px;line-height:1.6;color:var(--text-2)}
.check-list{margin:0;padding:0;list-style:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;align-content:start}
.check-list li{background:#fff;border-radius:12px;padding:14px 16px;font-size:15px;font-weight:500;display:flex;gap:10px;align-items:flex-start}
.check-list svg,.ai-feat svg{width:18px;height:18px;flex:none;margin-top:2px}

/* AI */
.ai{background:var(--ink);color:#fff}
.ai .eyebrow{color:var(--accent-hover)}
.ai .lead{color:var(--on-dark)}
.ai-layout{display:grid;grid-template-columns:minmax(0,340px) minmax(0,1fr);gap:40px}
.ai-tabs{display:flex;flex-direction:column;gap:4px}
.ai-tab{text-align:left;cursor:pointer;font:inherit;width:100%;background:transparent;color:var(--on-dark-3);border:0;border-left:3px solid var(--ink-soft);padding:16px 20px;display:flex;flex-direction:column;gap:4px;min-height:44px}
.ai-tab:hover{color:#fff}
.ai-tab[aria-selected="true"]{color:#fff;border-left-color:var(--accent);background:var(--ink-2)}
.ai-tab strong{font-size:18px}
.ai-tab span{font-size:14px}
.ai-panel{background:var(--ink-2);border-radius:24px;padding:40px;display:flex;flex-direction:column;gap:28px;position:relative;overflow:hidden}
.ai-panel[hidden]{display:none}
.ai-corner{position:absolute;right:24px;top:24px;width:64px;height:64px;border-right:6px solid var(--accent);border-top:6px solid var(--accent);border-top-right-radius:22px}
.ai-head{display:flex;flex-direction:column;gap:10px;padding-right:80px}
.ai-badge{font-family:var(--mono);font-size:13px;color:var(--accent-hover)}
.ai-head h3{font-size:34px;letter-spacing:-.02em;line-height:1.1}
.ai-head p{font-size:18px;line-height:1.55;color:var(--on-dark-2)}
.ps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.ps{border:1px solid var(--ink-line);border-radius:16px;padding:20px;display:flex;flex-direction:column;gap:8px}
.ps-label{font-family:var(--mono);font-size:12px;color:var(--on-dark-3);text-transform:uppercase;letter-spacing:.06em}
.ps p{font-size:16px;line-height:1.55;color:var(--on-dark-2)}
.ai-feat{margin:0;padding:0;list-style:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.ai-feat li{display:flex;gap:10px;align-items:flex-start;font-size:15px;line-height:1.5}
.ai-foot{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;border-top:1px solid var(--ink-line);padding-top:24px}
.ai-foot span{font-size:15px;color:var(--on-dark)}
.ai-foot strong{color:#fff}
.ai-foot .btn{min-height:46px;font-size:15px}

/* Channels */
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{cursor:pointer;font-family:inherit;font-size:14px;font-weight:600;min-height:44px;padding:0 16px;border-radius:999px;border:1.5px solid var(--ink);background:#fff;color:var(--ink)}
.chip[aria-pressed="true"]{background:var(--ink);color:#fff}
.ch-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin:0;padding:0;list-style:none}
.ch{border:1.5px solid var(--line);border-radius:18px;padding:22px;display:flex;flex-direction:column;gap:14px;min-height:180px}
.ch[hidden]{display:none}
.ch-logo{height:64px;border-radius:12px;background:var(--soft);display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:12px;color:var(--muted);overflow:hidden}
.ch-logo img{max-height:48px;width:auto}
.ch strong{font-size:18px}
.ch span{font-size:14px;color:var(--muted)}
.note{font-size:15px;color:var(--muted)}
.note a{font-weight:600}

/* Projects */
.proj-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.proj{background:var(--soft);border-radius:22px;padding:30px;display:flex;flex-direction:column;gap:12px}
.proj .tag{font-family:var(--mono);font-size:13px;color:var(--muted)}
.proj h3{font-size:24px}
.proj p{font-size:16px;line-height:1.55;color:var(--text-2)}
.proj.dark{background:var(--ink);color:#fff}
.proj.dark .tag{color:var(--accent-hover)}
.proj.dark p{color:var(--on-dark)}

/* EU */
.eu{border:1.5px solid var(--line);border-radius:22px;padding:28px 32px;display:flex;gap:28px;align-items:center;flex-wrap:wrap}
.eu-logo{width:96px;height:64px;border-radius:8px;background:var(--soft);display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:11px;color:var(--muted);flex:none}
.eu p{font-size:15px;line-height:1.55;color:var(--text-2);flex:1 1 420px}
.eu a{font-weight:700;font-size:15px}

/* Contact */
.contact{background:var(--soft)}
.contact-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);gap:56px}
.contact-copy{display:flex;flex-direction:column;gap:20px}
.contact-data{display:flex;flex-direction:column;gap:12px;margin-top:12px;font-size:16px;font-style:normal}
.form-card{background:#fff;border-radius:24px;padding:36px}
.form{display:flex;flex-direction:column;gap:16px}
.form-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.field{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:600}
.field input,.field select,.field textarea{font:inherit;font-weight:400;font-size:16px;padding:13px 14px;border:1.5px solid var(--field);border-radius:12px;background:#fff;color:var(--ink);min-height:48px;width:100%}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--ink)}
.form[hidden]{display:none}
.hp{position:absolute;left:-9999px}
.form .btn{align-self:flex-start}
.form-error{color:#B3261E;font-size:15px;font-weight:600}
.form-error[hidden]{display:none}
.sent{display:flex;flex-direction:column;gap:16px;align-items:flex-start;padding:24px 0}
.sent[hidden]{display:none}
.sent-ico{width:56px;height:56px;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center}
.sent h3{font-size:28px}
.sent p{font-size:17px;color:var(--text-2)}

/* Footer */
.footer{background:var(--ink);color:var(--on-dark);padding:72px 0 40px}
.foot-grid{display:grid;grid-template-columns:minmax(0,1.4fr) repeat(3,minmax(0,1fr));gap:40px}
.foot-brand{display:flex;flex-direction:column;gap:18px}
.foot-brand img{height:44px;width:auto}
.foot-brand p{font-size:15px;line-height:1.6;max-width:320px}
.foot-col{display:flex;flex-direction:column;gap:10px;font-size:15px}
.foot-col strong{color:#fff}
.foot-col a{color:var(--on-dark);text-decoration:none}
.foot-col a:hover{color:#fff}
.foot-bottom{border-top:1px solid var(--ink-soft);margin-top:48px;padding-top:24px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:14px;color:var(--on-dark-3)}
.foot-bottom a{color:var(--on-dark-3);text-decoration:none}
.foot-bottom a:hover{color:#fff}

/* Infrastructure */
.flow{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:minmax(0,1fr) 40px minmax(0,1fr) 40px minmax(0,1fr);align-items:stretch;gap:8px}
.flow-step{background:var(--soft);border-radius:20px;padding:26px 24px;display:flex;flex-direction:column;gap:8px}
.flow-step.dark{background:var(--ink);color:#fff}
.flow-step strong{font-size:22px;letter-spacing:-.01em}
.flow-step span:last-child{font-size:15px;color:var(--muted)}
.flow-step.dark span:last-child{color:var(--on-dark)}
.flow-num{font-family:var(--mono);font-size:13px;color:var(--accent-text)}
.flow-step.dark .flow-num{color:var(--accent-hover)}
.flow-arrow{display:flex;align-items:center;justify-content:center;color:var(--ink)}
.flow-arrow svg{width:28px;height:28px}
.infra-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.infra-card{border:1.5px solid var(--line);border-radius:var(--radius);padding:26px;display:flex;flex-direction:column;gap:10px}
.infra-card h3{font-size:21px;letter-spacing:-.01em}
.infra-card p{font-size:16px;line-height:1.55;color:var(--text-2)}
.peers{border-top:1px solid var(--line);padding-top:32px;display:grid;grid-template-columns:minmax(0,280px) minmax(0,1fr);gap:32px;align-items:start}
.peers-head{display:flex;flex-direction:column;gap:6px}
.peers-head strong{font-size:22px}
.peers-head span{font-size:15px;color:var(--muted)}
.peer-list{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:10px}
.peer-list li{font-weight:700;font-size:17px;padding:12px 20px;border-radius:12px;background:var(--soft);letter-spacing:-.005em}
.peer-list li.more{background:transparent;box-shadow:inset 0 0 0 1.5px var(--line);color:var(--muted);font-weight:600}

/* About */
.about-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);gap:56px;align-items:start}
.about-copy{display:flex;flex-direction:column;gap:16px}
.about-copy p{font-size:17px;line-height:1.65;color:var(--text-2)}

/* Responsive */
@media (max-width:980px){
  .hero-grid,.svc-panel,.ai-layout,.contact-grid{grid-template-columns:minmax(0,1fr)}
  .stats{grid-template-columns:repeat(2,minmax(0,1fr))}
  .stat:first-child{padding-left:20px}
  .svc-grid,.proj-grid{grid-template-columns:minmax(0,1fr)}
  .svc-card{min-height:0}
  .ch-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .nav,.header-right .langs,.header-right .btn{display:none}
  .burger{display:inline-flex}
  .header.open .mobile-nav{display:flex}
  .hero-visual{display:none}
  .ai-tabs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
  .ai-tab{border-left:0;border-radius:12px;background:var(--ink-2);box-shadow:inset 0 0 0 1.5px var(--ink-soft);padding:14px 16px}
  .ai-tab[aria-selected="true"]{box-shadow:inset 0 0 0 2px var(--accent)}
  .flow{grid-template-columns:minmax(0,1fr)}
  .flow-arrow{height:28px}.flow-arrow svg{transform:rotate(90deg)}
  .infra-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .peers,.about-grid{grid-template-columns:minmax(0,1fr);gap:20px}
}
@media (max-width:560px){
  .wrap{padding:0 16px}
  .section{padding:72px 0}
  .h1{font-size:40px}
  .h2{font-size:32px}
  .hero{padding:56px 0 48px}
  .svc-panel,.ai-panel,.form-card{padding:24px}
  .check-list,.ai-feat,.form-row,.foot-grid,.infra-grid{grid-template-columns:minmax(0,1fr)}
  .ai-tab span{display:none}
  .peer-list li{font-size:15px;padding:10px 14px}
  .ai-head{padding-right:56px}
  .ai-head h3{font-size:28px}
  .stat dd{font-size:30px}
  .stat,.stat:first-child{padding:20px 12px 20px 0}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}