/* ============================================================
   Обзор платформы ИТС — стили посадочной страницы
   ============================================================ */
:root{
  --brand:#2563eb;
  --brand-700:#1d4ed8;
  --brand-900:#1e3a8a;
  --cyan:#38bdf8;
  --ink:#0f172a;
  --text:#1f2937;
  --muted:#64748b;
  --line:#e6edf7;
  --bg:#f6f9fc;
  --bg-soft:#eef4ff;
  --card:#ffffff;
  --radius:18px;
  --shadow-sm:0 2px 12px rgba(15,23,42,.06);
  --shadow:0 12px 36px rgba(24,54,103,.10);
  --shadow-brand:0 18px 48px rgba(37,99,235,.22);
  --header-h:64px;
  --maxw:1180px;
  --font:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 64px)}
body{
  margin:0;font-family:var(--font);color:var(--text);
  background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;
  padding-top:var(--header-h);
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* ===== Top header ===== */
.pf-header{
  position:fixed;top:0;left:0;right:0;height:var(--header-h);z-index:1000;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:0 20px;background:rgba(255,255,255,.85);
  backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line);
}
.pf-logo{display:flex;align-items:center;gap:12px;font-weight:700;color:var(--ink)}
.pf-logo .mark{
  width:38px;height:38px;border-radius:10px;display:grid;place-items:center;
  font-weight:800;font-size:15px;color:#fff;letter-spacing:-.02em;
  background:linear-gradient(135deg,var(--brand) 0%,var(--cyan) 100%);
}
.pf-logo small{display:block;font-size:11px;font-weight:600;color:var(--muted)}
.pf-logo b{font-size:15px}
.pf-header__actions{display:flex;align-items:center;gap:10px}
.pf-back{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--muted);padding:8px 12px;border-radius:9px;transition:.2s}
.pf-back:hover{color:var(--brand);background:var(--bg-soft)}
.btn-cta{
  display:inline-flex;align-items:center;gap:8px;background:var(--brand);color:#fff;
  font-weight:600;font-size:14px;padding:10px 18px;border-radius:10px;transition:transform .25s,box-shadow .25s;
}
.btn-cta:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(37,99,235,.35)}

/* ===== Section nav (sticky pills) ===== */
.pf-subnav{position:sticky;top:var(--header-h);z-index:900;background:rgba(246,249,252,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.pf-subnav__inner{display:flex;gap:6px;overflow-x:auto;padding:10px 20px;max-width:var(--maxw);margin:0 auto;
  -webkit-overflow-scrolling:touch;scrollbar-width:none;-ms-overflow-style:none}
.pf-subnav__inner::-webkit-scrollbar{display:none;width:0;height:0}
.pf-subnav a{flex:0 0 auto;font-size:12.5px;font-weight:600;color:var(--muted);padding:7px 11px;border-radius:999px;border:1px solid transparent;transition:.2s;white-space:nowrap}
/* Подсказка прокрутки: затухание у правого края. На широком экране меню уже,
   чем полоса, поэтому градиент ложится на пустой фон того же цвета и не виден;
   как только кнопки доходят до края (узкий экран) — он показывает, что есть ещё. */
.pf-subnav::after{content:"";position:absolute;top:0;right:0;bottom:0;width:40px;pointer-events:none;background:linear-gradient(90deg,rgba(246,249,252,0),rgba(246,249,252,.92))}
.pf-subnav a:hover{color:var(--brand);background:#fff;border-color:var(--line)}
.pf-subnav a.is-active{color:#fff;background:var(--brand);border-color:var(--brand)}

/* ===== Hero ===== */
.pf-hero{position:relative;overflow:hidden;padding:72px 0 56px;background:
  radial-gradient(1100px 480px at 80% -10%,rgba(56,189,248,.18),transparent 60%),
  radial-gradient(900px 460px at 0% 0%,rgba(37,99,235,.16),transparent 55%),
  linear-gradient(180deg,#fff 0%,var(--bg) 100%)}
.pf-hero__badge{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--brand-700);background:#fff;border:1px solid var(--line);padding:7px 14px;border-radius:999px;box-shadow:var(--shadow-sm)}
.pf-hero h1{font-size:clamp(32px,5vw,52px);line-height:1.08;letter-spacing:-.02em;color:var(--ink);margin:18px 0 14px;font-weight:800}
.pf-hero h1 .grad{background:linear-gradient(135deg,var(--brand) 0%,var(--cyan) 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.pf-hero p{font-size:clamp(16px,2vw,20px);color:var(--muted);max-width:720px;margin:0 0 28px}
.pf-hero__cta{display:flex;flex-wrap:wrap;gap:12px}
.btn-lg{padding:14px 26px;font-size:16px;border-radius:12px}
.btn-ghost{background:rgba(37,99,235,.08);color:var(--brand)}
.btn-ghost:hover{background:rgba(37,99,235,.16)}
.pf-stats{display:flex;flex-wrap:wrap;gap:36px;margin-top:42px}
.pf-stat b{display:block;font-size:30px;font-weight:800;color:var(--ink);line-height:1}
.pf-stat span{font-size:14px;color:var(--muted)}

/* ===== Section base ===== */
.section{padding:64px 0}
.section--alt{background:linear-gradient(180deg,var(--bg-soft) 0%,#fff 100%)}
.section__head{max-width:760px;margin:0 auto 40px;text-align:center}
.eyebrow{font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--brand)}
.section h2{font-size:clamp(26px,3.4vw,38px);line-height:1.15;letter-spacing:-.01em;color:var(--ink);margin:10px 0 12px;font-weight:800}
.section__head p{font-size:17px;color:var(--muted);margin:0}

/* ===== Module cards (overview) ===== */
.sub-label{font-size:14px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin:0 0 18px}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.mcard{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);transition:transform .25s,box-shadow .25s,border-color .25s;display:flex;flex-direction:column;gap:12px}
.mcard:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(37,99,235,.3)}
.mcard__top{display:flex;align-items:center;gap:14px}
.mcard__icon{width:50px;height:50px;border-radius:13px;display:grid;place-items:center;background:var(--bg-soft);color:var(--brand);flex-shrink:0}
.mcard__icon svg{width:26px;height:26px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.mcard__num{font-size:12px;font-weight:700;color:var(--brand);background:#fff;border:1px solid var(--line);border-radius:999px;padding:3px 10px}
.mcard h3{font-size:18px;margin:0;color:var(--ink);font-weight:700}
.mcard p{margin:0;font-size:14.5px;color:var(--muted)}
.mcard__link{margin-top:auto;font-size:13px;font-weight:600;color:var(--brand);display:inline-flex;align-items:center;gap:6px;opacity:0;transform:translateX(-4px);transition:.25s}
.mcard:hover .mcard__link{opacity:1;transform:translateX(0)}

/* ===== Architecture note ===== */
.arch{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:44px}
.arch__item{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;box-shadow:var(--shadow-sm)}
.arch__item b{display:block;font-size:22px;color:var(--ink);font-weight:800;margin-bottom:4px}
.arch__item span{font-size:14px;color:var(--muted)}

/* ===== Partners ===== */
.partners{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.partner{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px 18px;text-align:center;box-shadow:var(--shadow-sm);transition:transform .25s,box-shadow .25s}
.partner:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.partner b{display:block;font-size:17px;color:var(--ink);font-weight:700}
.partner span{font-size:13px;color:var(--muted)}

/* ===== Pricing highlight ===== */
.pricing{background:linear-gradient(135deg,var(--brand) 0%,var(--brand-900) 100%);border-radius:24px;color:#fff;padding:48px;position:relative;overflow:hidden;box-shadow:var(--shadow-brand)}
.pricing::after{content:"";position:absolute;right:-80px;top:-80px;width:320px;height:320px;border-radius:50%;background:radial-gradient(circle,rgba(56,189,248,.5),transparent 70%)}
.pricing__grid{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;position:relative;z-index:1}
.pricing h2{color:#fff;margin-top:0}
.pricing .free{font-size:clamp(34px,5vw,52px);font-weight:800;line-height:1;margin:6px 0 14px}
.pricing p{color:rgba(255,255,255,.88);font-size:16px}
.pricing .pill{display:inline-block;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.25);padding:6px 14px;border-radius:999px;font-size:14px;font-weight:600;margin-bottom:14px}
.split{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);border-radius:16px;padding:24px}
.split h3{margin:0 0 14px;font-size:18px}
.split ol{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:10px}
.split li{color:rgba(255,255,255,.92);font-size:15px}

/* ===== Module tour ===== */
.tour-module{padding:64px 0;border-top:1px solid var(--line)}
.tour-module:nth-child(even){background:linear-gradient(180deg,#fff 0%,var(--bg) 100%)}
.module-head{display:flex;align-items:flex-start;gap:20px;margin-bottom:40px}
.module-head__num{flex:0 0 auto;width:58px;height:58px;border-radius:16px;display:grid;place-items:center;font-size:24px;font-weight:800;color:#fff;background:linear-gradient(135deg,var(--brand) 0%,var(--cyan) 100%);box-shadow:0 10px 24px rgba(37,99,235,.3)}
.module-head__txt{flex:1;min-width:0}
.module-head h2{margin:2px 0 8px;font-size:clamp(24px,3vw,32px);color:var(--ink);font-weight:800;letter-spacing:-.01em}
.module-head p{margin:0;color:var(--muted);font-size:16.5px;max-width:780px}
.module-head a.ext{display:inline-flex;align-items:center;gap:6px;margin-top:10px;font-size:14px;font-weight:600;color:var(--brand)}

/* steps */
.step{margin-bottom:48px}
.step:last-child{margin-bottom:0}
.step__title{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:700;color:var(--ink);margin:0 0 8px}
.step__title .dot{width:26px;height:26px;border-radius:8px;display:grid;place-items:center;font-size:12px;font-weight:700;background:var(--bg-soft);color:var(--brand);flex:0 0 auto}
.step__text{color:var(--muted);font-size:16px;margin:0 0 18px;max-width:780px}

/* split layout (single image) */
.step--split .step__inner{display:grid;grid-template-columns:1fr 1.15fr;gap:36px;align-items:center}
.step--split:nth-of-type(even) .step__media{order:-1}
.step--split .step__copy .step__text{margin-bottom:0}

/* gallery (multi image) */
.gallery{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}

/* media frame */
.shot{margin:0;border-radius:14px;overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow);cursor:zoom-in;transition:transform .3s,box-shadow .3s;position:relative}
.shot:hover{transform:translateY(-4px);box-shadow:var(--shadow-brand)}
.shot img{width:100%;height:auto}
.shot figcaption{font-size:13px;color:var(--muted);padding:10px 14px;border-top:1px solid var(--line);background:#fff}
.shot--phone{max-width:300px;margin:0 auto}
.phones{display:flex;flex-wrap:wrap;gap:22px;justify-content:center}

/* zoom hint */
.shot::after{content:"⤢";position:absolute;top:10px;right:10px;width:30px;height:30px;border-radius:8px;display:grid;place-items:center;background:rgba(15,23,42,.55);color:#fff;font-size:15px;opacity:0;transition:.25s}
.shot:hover::after{opacity:1}

/* ===== Lightbox ===== */
.lightbox{position:fixed;inset:0;z-index:2000;background:rgba(8,12,22,.92);display:none;align-items:center;justify-content:center;padding:24px;cursor:zoom-out}
.lightbox.open{display:flex}
.lightbox img{max-width:96vw;max-height:92vh;border-radius:10px;box-shadow:0 30px 80px rgba(0,0,0,.6)}
.lightbox__close{position:absolute;top:18px;right:22px;width:44px;height:44px;border-radius:50%;border:none;background:rgba(255,255,255,.14);color:#fff;font-size:22px;cursor:pointer;transition:.2s}
.lightbox__close:hover{background:rgba(255,255,255,.28)}

/* ===== CTA band ===== */
.cta-band{background:linear-gradient(135deg,#0b1220 0%,#15213b 100%);color:#fff;border-radius:24px;padding:54px 40px;text-align:center;box-shadow:var(--shadow)}
.cta-band h2{color:#fff;margin:0 0 12px;font-size:clamp(26px,3.4vw,36px)}
.cta-band p{color:rgba(255,255,255,.8);font-size:17px;max-width:620px;margin:0 auto 28px}
.cta-band .row{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.btn-white{background:#fff;color:var(--ink)}
.btn-white:hover{background:#eef4ff}
.btn-outline{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.4)}
.btn-outline:hover{background:rgba(255,255,255,.1)}

/* ===== Footer ===== */
.pf-footer{background:#0b1220;color:#94a3b8;padding:34px 20px;text-align:center}
.pf-footer a{color:#cbd5e1}
.pf-footer a:hover{color:#fff}
.pf-footer nav{display:flex;flex-wrap:wrap;gap:8px 22px;justify-content:center;margin-bottom:14px}
.pf-footer small{font-size:13px}

/* ===== Reveal animation ===== */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ===== Responsive ===== */
@media (max-width:980px){
  .cards{grid-template-columns:repeat(2,1fr)}
  .arch{grid-template-columns:repeat(2,1fr)}
  .partners{grid-template-columns:repeat(3,1fr)}
  .pricing__grid{grid-template-columns:1fr}
  .step--split .step__inner{grid-template-columns:1fr;gap:20px}
  .step--split:nth-of-type(even) .step__media{order:0}
}

@media (max-width:720px){
  .cards{grid-template-columns:1fr}
  .gallery{grid-template-columns:1fr}
  .section{padding:48px 0}
  .pf-hero{padding:56px 0 44px}
}

/* ===== Phones ===== */
@media (max-width:600px){
  :root{--header-h:56px}
  .container{padding:0 16px}

  /* header */
  .pf-header{padding:0 14px;gap:10px}
  .pf-logo .mark{width:34px;height:34px;font-size:14px}
  .pf-logo b{font-size:14px}
  .pf-logo small{display:none}
  .pf-back{padding:8px 10px}
  .pf-back span{display:none}            /* остаётся только стрелка ← */
  .btn-cta{padding:9px 14px;font-size:13px}

  /* sub-nav */
  .pf-subnav__inner{padding:8px 14px;gap:6px}
  .pf-subnav a{padding:6px 10px;font-size:12px}

  /* hero */
  .pf-hero__badge{font-size:12px;padding:6px 12px}
  .pf-hero p{font-size:16px}
  .pf-hero__cta{flex-direction:column;align-items:stretch}
  .pf-hero__cta .btn-cta{width:100%;justify-content:center}
  .btn-lg{padding:13px 20px;font-size:15px}
  .pf-stats{display:grid;grid-template-columns:1fr 1fr;gap:18px 14px;margin-top:32px}
  .pf-stat b{font-size:24px}
  .pf-stat span{font-size:13px}

  /* sections */
  .section__head{margin-bottom:28px}
  .section__head p{font-size:15.5px}
  .partners{grid-template-columns:repeat(2,1fr)}
  .arch{grid-template-columns:1fr}

  /* pricing */
  .pricing{padding:28px 18px;border-radius:18px}
  .pricing .free{margin-bottom:10px}
  .split{padding:18px}
  .split li{font-size:14px}

  /* module tour */
  .tour-module{padding:44px 0}
  .module-head{gap:12px;margin-bottom:28px}
  .module-head__num{width:44px;height:44px;font-size:18px;border-radius:13px}
  .module-head p{font-size:15.5px}
  .step{margin-bottom:34px}
  .step__title{font-size:17px}
  .step__text{font-size:15px}
  .shot figcaption{font-size:12.5px;padding:9px 12px}
  .shot--phone{max-width:240px}
  .phones{gap:16px}

  /* cta band */
  .cta-band{padding:38px 20px;border-radius:18px}
  .cta-band p{font-size:15.5px}
  .cta-band .row{flex-direction:column;align-items:stretch}
  .cta-band .row .btn-cta{width:100%;justify-content:center}

  /* lightbox close — крупнее палец */
  .lightbox__close{top:12px;right:14px}
}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}