/* Общая дизайн-система лендинга ЮСТИАС — визуальный язык взят из прототипа-референса (светлая
   тема, карточки, скруглённые формы, синий+бирюзовый градиент), подключается на всех страницах
   сайта (landing.html, features.html, audience.html, faq.html) одним файлом, чтобы не дублировать
   полтысячи строк CSS в каждом html — того же типа переиспользование, что и legal.css у страниц
   /legal/*.html. pricing.js (общий для всех страниц, подтягивает тарифы из БД) рассчитан именно на
   классы .price/.tier/.who/.sum/.per/.badge/.hot ниже — при правке разметки тарифной карточки
   держать оба файла в синхронизации. */
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --navy:#0b132b;--navy2:#1c2541;--blue:#2563eb;--blue-l:#3b82f6;--blue-pale:#eff6ff;
  --green:#10b981;--green-pale:#ecfdf5;--red:#ef4444;--red-pale:#fef2f2;
  --amber:#f59e0b;--amber-pale:#fffbeb;--purple:#8b5cf6;--purple-pale:#f5f3ff;
  --teal:#06b6d4;--teal-pale:#ecfeff;
  --g50:#f8fafc;--g100:#f1f5f9;--g200:#e2e8f0;--g300:#cbd5e1;--g400:#94a3b8;
  --g500:#64748b;--g700:#334155;--g900:#0f172a;
  --muted:#64748b;
  --shadow-sm:0 2px 8px rgba(15,23,42,0.04);
  --shadow-md:0 12px 24px rgba(15,23,42,0.06);
  --shadow-lg:0 24px 48px rgba(15,23,42,0.08);
  --radius:16px;
}
html{scroll-behavior:smooth}
body{font-family:'Inter',sans-serif;background:var(--g50);color:var(--g900);line-height:1.6;-webkit-font-smoothing:antialiased}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
a{color:inherit}
img{max-width:100%}

/* ===== HEADER ===== */
header.hd{position:sticky;top:20px;z-index:50;padding:10px 0}
.hd-wrap{background:rgba(255,255,255,0.8);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,0.6);box-shadow:var(--shadow-md);border-radius:50px}
.hd{display:flex;align-items:center;gap:20px;height:56px;padding:0 24px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;color:var(--navy);text-decoration:none;letter-spacing:-.5px}
.logo svg{flex:none}
nav.hd-nav{margin-left:auto;display:flex;gap:24px;align-items:center}
nav.hd-nav a{font-size:14px;font-weight:500;color:var(--g700);text-decoration:none}
nav.hd-nav a:hover{color:var(--blue)}
nav.hd-nav a.active{color:var(--blue)}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:12px;padding:12px 22px;font-size:14px;font-weight:600;cursor:pointer;text-decoration:none;text-align:center;transition:all .2s ease;font-family:inherit}
.btn-blue,.btn-primary{background:var(--blue);color:#fff;box-shadow:0 4px 14px rgba(37,99,235,.3)}
.btn-blue:hover,.btn-primary:hover{background:var(--blue-l);transform:translateY(-2px);box-shadow:0 6px 20px rgba(37,99,235,.4)}
.btn-white{background:#fff;color:var(--blue);box-shadow:0 4px 14px rgba(0,0,0,.1)}
.btn-white:hover{background:#f0f4ff;transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--g700);border:1px solid var(--g300)}
.btn-ghost:hover{background:var(--g50);border-color:var(--g400)}
.btn-sm{padding:10px 18px;font-size:13px;border-radius:30px}
.btn-disabled{opacity:.55;cursor:not-allowed;position:relative}
.btn-disabled:hover{transform:none;background:initial;box-shadow:none}
.btn-disabled.btn-ghost:hover{background:transparent;border-color:var(--g300)}
.soon-badge{margin-left:8px;font-size:10.5px;font-weight:700;letter-spacing:.02em;background:rgba(15,23,42,.08);padding:2px 8px;border-radius:999px;vertical-align:middle}
.btn-primary .soon-badge,.btn-blue .soon-badge{background:rgba(255,255,255,.25);color:#fff}

/* ===== HERO ===== */
.hero{position:relative;padding:100px 0 80px;overflow:hidden;background-color:var(--navy);
  background-image:
    radial-gradient(circle at 20% 20%, rgba(37, 99, 235, 0.25) 0%, transparent 40%),
    radial-gradient(circle at 80% 60%, rgba(6, 182, 212, 0.15) 0%, transparent 40%);
  color:#fff;text-align:center}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);background-size:60px 60px;mask-image:radial-gradient(circle at center, black 0%, transparent 80%);-webkit-mask-image:radial-gradient(circle at center, black 0%, transparent 80%);pointer-events:none}
.hero h1{font-size:52px;line-height:1.1;font-weight:800;letter-spacing:-1.5px;max-width:900px;margin:0 auto 24px;position:relative}
.hero h1 span{background:linear-gradient(90deg,var(--blue-l),var(--teal));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero p.sub{font-size:18px;opacity:.8;max-width:700px;margin:0 auto 40px;font-weight:300;position:relative}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:48px;justify-content:center;position:relative}
.trust{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;position:relative}
.trust span{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);backdrop-filter:blur(4px);border-radius:30px;padding:8px 16px;font-size:13px;font-weight:500;display:flex;align-items:center;gap:6px}

/* page-header — упрощённая версия .hero для внутренних страниц (features/audience/faq):
   тот же тёмный фон, без preview-плашки и без крупного grid-паттерна. */
.page-hero{background-color:var(--navy);color:#fff;padding:64px 0 56px;text-align:center;position:relative;overflow:hidden}
.page-hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 15% 20%, rgba(37,99,235,.22) 0%, transparent 45%),radial-gradient(circle at 85% 70%, rgba(6,182,212,.14) 0%, transparent 45%);pointer-events:none}
.page-hero>*{position:relative}
.page-hero h1{font-size:clamp(28px,4vw,42px);font-weight:800;letter-spacing:-1px;margin-bottom:14px}
.page-hero p{font-size:16.5px;opacity:.8;max-width:640px;margin:0 auto;font-weight:300}

/* ===== SECTIONS ===== */
section{padding:80px 0;position:relative}
h2.sec{font-size:36px;font-weight:800;letter-spacing:-1px;margin-bottom:16px;text-align:center;color:var(--navy)}
p.sec-sub{font-size:17px;color:var(--g500);text-align:center;max-width:650px;margin:0 auto 48px;font-weight:300}
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:960px){.g3,.g4{grid-template-columns:repeat(2,1fr)}nav.hd-nav{display:none}.hero h1{font-size:36px}}
@media(max-width:620px){.g2,.g3,.g4{grid-template-columns:1fr}.hero h1{font-size:32px}section{padding:56px 0}}

/* ===== CARDS ===== */
.card{background:#fff;border:1px solid var(--g200);border-radius:var(--radius);padding:28px;transition:all .3s ease;box-shadow:var(--shadow-sm);height:100%}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:rgba(37,99,235,0.2)}
.card .ic{width:52px;height:52px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:20px;background:var(--blue-pale);color:var(--blue)}
.card h3{font-size:18px;font-weight:700;margin-bottom:10px;color:var(--navy)}
.card p{font-size:14px;color:var(--g500);line-height:1.6}
.pain .ic{background:var(--red-pale);color:var(--red)}
.pain h3{color:var(--red)}
.card .example{margin-top:14px;padding-top:14px;border-top:1px solid var(--g100);font-size:13px;color:var(--g700)}
.card .example b{color:var(--navy);display:block;margin-bottom:4px;font-size:11.5px;text-transform:uppercase;letter-spacing:.04em;font-weight:700;color:var(--blue)}

/* ===== STEPS ===== */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;counter-reset:st}
@media(max-width:800px){.steps{grid-template-columns:1fr}}
.step{position:relative;background:#fff;border:1px solid var(--g200);border-radius:var(--radius);padding:32px 28px 28px 80px;box-shadow:var(--shadow-sm);transition:all .3s ease}
.step:hover{box-shadow:var(--shadow-md);border-color:var(--blue)}
.step::before{counter-increment:st;content:counter(st);position:absolute;left:24px;top:32px;width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--blue-l));color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:16px;box-shadow:0 4px 10px rgba(37,99,235,.3)}

/* ===== SECURITY BOX ===== */
.secbox{background:linear-gradient(135deg,var(--navy) 0%,var(--navy2) 100%);border-radius:24px;color:#fff;padding:48px;position:relative;overflow:hidden}
.secbox::before{content:"";position:absolute;top:0;left:0;width:300px;height:300px;background:radial-gradient(circle,rgba(37,99,235,.2) 0%,transparent 70%);transform:translate(-50%,-50%)}
.secbox h2{font-size:28px;font-weight:800;margin-bottom:24px;position:relative}
.secbox ul{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:20px;position:relative}
@media(max-width:800px){.secbox ul{grid-template-columns:1fr}.secbox{padding:32px}}
.secbox li{font-size:15px;opacity:.9;padding-left:36px;position:relative;line-height:1.5}
.secbox li::before{content:'🔒';position:absolute;left:0;font-size:20px}

/* ===== PRICING (классы задаёт pricing.js — держать в синхронизации) ===== */
.pricing-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;align-items:stretch}
@media(max-width:960px){.pricing-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.pricing-grid{grid-template-columns:1fr}}
.price{background:#fff;border:1px solid var(--g200);border-radius:20px;padding:32px 28px;display:flex;flex-direction:column;position:relative;box-shadow:var(--shadow-sm);transition:all .3s ease}
.price:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}
.price.hi{border:2px solid var(--blue);box-shadow:0 20px 40px rgba(37,99,235,.15)}
.price.free{border-color:rgba(16,185,129,.35)}
.price .badge{position:absolute;top:-14px;left:50%;transform:translateX(-50%);background:linear-gradient(90deg,var(--blue),var(--blue-l));color:#fff;font-size:12px;font-weight:700;border-radius:20px;padding:6px 16px;white-space:nowrap;box-shadow:0 4px 10px rgba(37,99,235,.3)}
.price .tier{font-size:11.5px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--g400)}
.price .tier.hi{color:var(--blue)}
.price .tier.free{color:var(--green)}
.price h3{font-size:20px;font-weight:800;margin:6px 0 6px;color:var(--navy)}
.price .price-val{font-size:32px;font-weight:800;color:var(--navy);margin-bottom:2px;letter-spacing:-1px}
.price .price-val small{font-size:12.5px;font-weight:500;color:var(--g400)}
.price ul{list-style:none;margin:16px 0 24px;flex-grow:1}
.price li{font-size:13.5px;padding:7px 0 7px 26px;position:relative;color:var(--g700);border-bottom:1px solid var(--g100)}
.price li:last-child{border-bottom:none}
.price li::before{content:'✓';position:absolute;left:0;top:7px;color:var(--green);font-weight:800}
.paynote{text-align:center;font-size:14px;color:var(--g500);margin-top:32px}

/* ===== QUOTE ===== */
.quote{background:linear-gradient(135deg,#1e293b,#334155);border-radius:24px;color:#fff;padding:56px 48px;font-size:20px;line-height:1.6;font-weight:300;font-style:italic;position:relative;overflow:hidden}
.quote b{color:var(--blue-l);font-weight:600;font-style:normal}
.quote .src{margin-top:24px;font-size:14px;opacity:.7;font-style:normal;font-weight:500}

/* ===== FAQ ===== */
details.faq{background:#fff;border:1px solid var(--g200);border-radius:12px;margin-bottom:12px;overflow:hidden;transition:box-shadow .3s}
details.faq[open]{box-shadow:var(--shadow-md);border-color:var(--blue)}
details.faq summary{cursor:pointer;padding:20px 24px;font-weight:600;font-size:16px;list-style:none;display:flex;gap:16px;align-items:center;color:var(--navy)}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::before{content:'+';font-size:24px;color:var(--blue);transition:transform .2s;font-weight:300;flex:none}
details.faq[open] summary::before{transform:rotate(45deg)}
details.faq .a{padding:0 24px 20px 60px;font-size:15px;color:var(--g500);line-height:1.6}
.faq-cat{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--blue);margin:40px 0 14px}
.faq-cat:first-of-type{margin-top:0}

/* ===== FINAL CTA ===== */
.final-cta{text-align:center;background:#fff;border:1px solid var(--g200);border-radius:28px;padding:56px 24px;max-width:900px;margin:0 auto;position:relative;overflow:hidden;box-shadow:var(--shadow-md)}
.final-cta::before{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(ellipse 500px 260px at 50% -20%, rgba(37,99,235,.08), transparent 60%)}
.final-cta>*{position:relative}
.final-cta h2{font-size:clamp(24px,3.4vw,32px);margin-bottom:14px;font-weight:800;color:var(--navy)}
.final-cta p{color:var(--g500);margin:0 0 26px;font-size:15.5px}

/* ===== FOOTER ===== */
footer{background:var(--navy);color:rgba(255,255,255,.6);padding:48px 0;font-size:14px;margin-top:0}
footer .wrap{display:flex;flex-wrap:wrap;gap:20px 40px;align-items:flex-start;justify-content:space-between}
.foot-brand{display:flex;align-items:center;gap:9px;font-weight:800;font-size:16px;color:#fff}
.foot-copy{margin-top:14px;font-size:13px;color:rgba(255,255,255,.5)}
.foot-col-title{font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.35);margin-bottom:12px}
.foot-links{display:flex;flex-direction:column;gap:9px;font-size:13.5px}
.foot-links a{color:rgba(255,255,255,.75);text-decoration:none}
.foot-links a:hover{color:#fff}
footer .bottom-copy{margin-top:32px;padding-top:24px;border-top:1px solid rgba(255,255,255,.1);font-size:12.5px;color:rgba(255,255,255,.4)}