/* kotelnikov.xyz — общий стиль (светлая тема) */
:root{
  --bg:#f5f7fa; --bg2:#eef2f7; --panel:#ffffff; --panel2:#f8fafc;
  --line:#e3e9f1; --line2:#d3dce8;
  --text:#16212e; --muted:#5b6a7c; --dim:#8494a7;
  --cyan:#0891b2; --blue:#2563eb; --green:#0e9f6e; --amber:#b45309; --rose:#e11d48; --violet:#7c3aed;
  --grad:linear-gradient(92deg,#06b6d4,#2563eb);
  --radius:16px;
  --shadow:0 8px 30px rgba(23,37,60,.08);
  --shadow-lg:0 14px 44px rgba(23,37,60,.13);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{background:var(--bg);color:var(--text);font-family:"Segoe UI",-apple-system,"SF Pro Text",Roboto,Arial,sans-serif;line-height:1.6;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img,svg{max-width:100%}
.wrap{max-width:1140px;margin:0 auto;padding:0 22px}
section{padding:84px 0}
h2{font-size:clamp(26px,3.6vw,36px);font-weight:800;letter-spacing:-.5px;line-height:1.2}
.sub{color:var(--muted);margin-top:14px;max-width:680px;font-size:16.5px}
.sub a{color:var(--blue);font-weight:600}
.kicker{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:2.2px;text-transform:uppercase;color:var(--cyan);margin-bottom:14px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.alt{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

/* ---------- header ---------- */
header{position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(255,255,255,.8);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid transparent;transition:border-color .25s,box-shadow .25s}
header.scrolled{border-bottom-color:var(--line);box-shadow:0 2px 14px rgba(23,37,60,.06)}
.nav{display:flex;align-items:center;gap:26px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:16.5px;letter-spacing:.2px;margin-right:auto}
.logo svg{flex:none}
.nav a.lnk{font-size:14.5px;color:var(--muted);font-weight:600;transition:color .15s}
.nav a.lnk:hover{color:var(--text)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;font-size:15px;padding:12px 22px;border-radius:12px;border:none;cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s}
.btn-grad{background:var(--grad);color:#fff;box-shadow:0 6px 20px rgba(37,99,235,.25)}
.btn-grad:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(37,99,235,.33)}
.btn-ghost{background:#fff;color:var(--text);border:1px solid var(--line2)}
.btn-ghost:hover{background:var(--panel2);transform:translateY(-2px)}
.nav .btn{padding:9px 18px;font-size:14px}
@media(max-width:820px){.nav a.lnk{display:none}}

/* ---------- hero ---------- */
.hero{position:relative;padding:160px 0 90px;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:
  radial-gradient(700px 420px at 80% 0%,rgba(37,99,235,.10),transparent 65%),
  radial-gradient(560px 380px at 8% 100%,rgba(6,182,212,.09),transparent 65%);pointer-events:none}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;position:relative}
@media(max-width:920px){.hero-grid{grid-template-columns:1fr}.hero{padding-top:120px}}
.hero h1{font-size:clamp(32px,5vw,52px);font-weight:850;letter-spacing:-1.2px;line-height:1.12}
.hero p.lead{margin-top:22px;font-size:18px;color:var(--muted);max-width:540px}
.hero .cta{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap}
.hero .trust{margin-top:30px;display:flex;gap:10px;flex-wrap:wrap}
.chip{font-size:12.5px;font-weight:600;color:var(--muted);border:1px solid var(--line2);border-radius:20px;padding:5px 13px;background:#fff}

/* mock dashboard */
.mock{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow-lg);padding:20px;position:relative}
.mock .bar{display:flex;gap:6px;margin-bottom:16px}
.mock .dot{width:10px;height:10px;border-radius:50%;background:var(--line2)}
.mock .dot:first-child{background:var(--rose)}
.mock .kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.kpi{background:var(--panel2);border:1px solid var(--line);border-radius:12px;padding:12px 14px}
.kpi .t{font-size:11.5px;color:var(--dim);font-weight:600;letter-spacing:.3px}
.kpi .v{font-size:19px;font-weight:800;margin-top:3px;letter-spacing:-.3px}
.kpi .d{font-size:11.5px;font-weight:700;margin-top:2px}
.up{color:var(--green)}.dn{color:var(--rose)}
.mock .chart{margin-top:14px;background:var(--panel2);border:1px solid var(--line);border-radius:12px;padding:14px}
.mock .chart .t{font-size:12px;color:var(--dim);font-weight:600;margin-bottom:8px}
.ai-note{margin-top:14px;display:flex;gap:10px;background:rgba(124,58,237,.06);border:1px solid rgba(124,58,237,.22);border-radius:12px;padding:12px 14px;font-size:13px;color:#4c3a86}
.ai-note b{color:var(--violet)}

/* ---------- stats ---------- */
.stats{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff;padding:34px 0}
.stats .row{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
@media(max-width:760px){.stats .row{grid-template-columns:repeat(2,1fr)}}
.stat .n{font-size:30px;font-weight:850;letter-spacing:-.5px}
.stat .l{font-size:13.5px;color:var(--muted);margin-top:4px}

/* ---------- cards ---------- */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:44px}
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:44px}
@media(max-width:920px){.grid3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.grid3,.grid2{grid-template-columns:1fr}}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:transform .18s,border-color .18s,box-shadow .18s;display:flex;flex-direction:column;box-shadow:0 2px 10px rgba(23,37,60,.04)}
.card:hover{transform:translateY(-4px);border-color:var(--line2);box-shadow:var(--shadow-lg)}
.card .ico{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:18px;font-size:21px;background:rgba(6,182,212,.09);border:1px solid rgba(6,182,212,.22)}
.card h3{font-size:18px;font-weight:750;letter-spacing:-.2px;margin-bottom:9px}
.card p{font-size:14.5px;color:var(--muted);flex:1}
.tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:16px}
.tag{font-size:11px;font-weight:700;letter-spacing:.3px;padding:3px 10px;border-radius:20px;background:rgba(91,106,124,.10);color:var(--muted)}
.tag.c{background:rgba(6,182,212,.11);color:var(--cyan)}
.tag.g{background:rgba(14,159,110,.11);color:var(--green)}
.tag.v{background:rgba(124,58,237,.10);color:var(--violet)}
.tag.a{background:rgba(180,83,9,.10);color:var(--amber)}

/* cases on index */
.case .res{margin-top:16px;padding-top:14px;border-top:1px dashed var(--line2);font-size:13.5px}
.case .res b{color:var(--green);font-weight:750}
.case .spark{margin:2px 0 14px}
.go{margin-top:14px;font-weight:750;font-size:14px;color:var(--blue);display:flex;align-items:center;gap:6px}
a.card:hover .go{text-decoration:underline}
.note-demo{margin-top:26px;font-size:14px;color:var(--muted);background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px}
.note-demo b{color:var(--text)}

/* ---------- process ---------- */
.steps{margin-top:48px;display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
@media(max-width:920px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.steps{grid-template-columns:1fr}}
.step{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:0 2px 10px rgba(23,37,60,.04)}
.step .n{width:34px;height:34px;border-radius:10px;background:var(--grad);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:15px;margin-bottom:14px}
.step h3{font-size:15.5px;font-weight:750;margin-bottom:6px}
.step p{font-size:13.5px;color:var(--muted)}

/* stack */
.stack{display:flex;flex-wrap:wrap;gap:10px;margin-top:36px}
.stack .chip{font-size:13.5px;padding:8px 17px;color:var(--text)}

/* ---------- lead form ---------- */
.lead-wrap{background:#fff;border:1px solid var(--line);border-radius:24px;padding:52px;display:grid;grid-template-columns:1fr 1fr;gap:48px;box-shadow:var(--shadow-lg);position:relative;overflow:hidden}
.lead-wrap::before{content:"";position:absolute;inset:0;background:radial-gradient(500px 300px at 92% 0%,rgba(37,99,235,.07),transparent 60%);pointer-events:none}
@media(max-width:860px){.lead-wrap{grid-template-columns:1fr;padding:34px 26px}}
.lead-info h2{margin-bottom:14px}
.lead-info li{margin:10px 0 0 20px;color:var(--muted);font-size:15px}
form{display:flex;flex-direction:column;gap:14px;position:relative}
label{font-size:13px;font-weight:700;color:var(--muted);letter-spacing:.3px}
input,textarea{width:100%;background:var(--panel2);border:1px solid var(--line2);border-radius:12px;color:var(--text);padding:13px 15px;font-size:15px;font-family:inherit;outline:none;transition:border-color .15s,box-shadow .15s;margin-top:6px}
input:focus,textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(37,99,235,.12);background:#fff}
textarea{resize:vertical;min-height:96px}
.hp{position:absolute;left:-9999px;opacity:0;height:0;overflow:hidden}
.form-msg{font-size:14.5px;border-radius:12px;padding:13px 16px;display:none}
.form-msg.ok{display:block;background:rgba(14,159,110,.08);border:1px solid rgba(14,159,110,.35);color:var(--green)}
.form-msg.err{display:block;background:rgba(225,29,72,.07);border:1px solid rgba(225,29,72,.3);color:var(--rose)}
.privacy{font-size:12px;color:var(--dim)}

footer{border-top:1px solid var(--line);padding:34px 0;color:var(--dim);font-size:13.5px;background:#fff}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
footer a{color:var(--muted)}
footer a:hover{color:var(--text)}

/* ---------- case detail pages ---------- */
.case-hero{position:relative;padding:140px 0 48px;overflow:hidden}
.case-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(640px 360px at 85% 0%,rgba(37,99,235,.09),transparent 65%);pointer-events:none}
.case-hero .crumbs{font-size:13.5px;color:var(--dim);margin-bottom:18px}
.case-hero .crumbs a{color:var(--blue);font-weight:600}
.case-hero h1{font-size:clamp(28px,4.2vw,42px);font-weight:850;letter-spacing:-1px;line-height:1.15;max-width:820px}
.case-hero .lead{margin-top:16px;font-size:17px;color:var(--muted);max-width:720px}
.meta-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:36px}
@media(max-width:760px){.meta-grid{grid-template-columns:repeat(2,1fr)}}
.meta{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px}
.meta .t{font-size:11.5px;font-weight:700;letter-spacing:.8px;text-transform:uppercase;color:var(--dim)}
.meta .v{font-size:14.5px;font-weight:650;margin-top:4px}
.case-body{padding:30px 0 84px}
.prose{max-width:820px}
.prose h2{font-size:24px;margin:44px 0 14px}
.prose p{color:var(--muted);font-size:16px;margin-top:12px}
.prose ul{margin:14px 0 0 4px;list-style:none}
.prose li{position:relative;padding-left:28px;margin-top:10px;color:var(--muted);font-size:15.5px}
.prose li::before{content:"";position:absolute;left:0;top:8px;width:14px;height:14px;border-radius:5px;background:var(--grad);opacity:.85}
.prose li b{color:var(--text)}
.result-block{margin-top:44px;background:rgba(14,159,110,.06);border:1px solid rgba(14,159,110,.3);border-radius:16px;padding:24px 28px;max-width:820px}
.result-block .t{font-size:12.5px;font-weight:800;letter-spacing:1.5px;text-transform:uppercase;color:var(--green);margin-bottom:8px}
.result-block p{color:var(--text);font-size:16px}
.shots{margin-top:44px;display:grid;gap:22px}
.shot{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--shadow)}
.shot img{display:block;width:100%}
.shot figcaption{font-size:13px;color:var(--dim);padding:12px 18px;border-top:1px solid var(--line)}
.shot-todo{border:1.5px dashed var(--line2);border-radius:16px;padding:34px;text-align:center;color:var(--dim);font-size:14.5px;background:var(--panel2)}
.case-cta{margin-top:56px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:34px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;box-shadow:var(--shadow)}
.case-cta h3{font-size:20px;font-weight:800}
.case-cta p{color:var(--muted);font-size:14.5px;margin-top:4px}

/* мобильная полировка */
@media(max-width:560px){
  section{padding:60px 0}
  .hero{padding:118px 0 64px}
  .case-hero{padding-top:108px}
  .mock{padding:14px}
  .mock .kpis{gap:8px}
  .kpi{padding:10px 11px}
  .kpi .v{font-size:16px}
  .nav{gap:14px}
  .nav .btn{padding:8px 14px;font-size:13.5px}
  .lead-wrap{padding:28px 18px}
  .case-cta{padding:24px 20px}
  .stats .row{gap:14px}
  .stat .n{font-size:25px}
}

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