/* ---------------------------------------------------------------
   Chetty — sdílený vzhled produktových landing pages.
   Používají ho ai-search/, chatbot/ a voicebot/. Barvy a písma
   drží stejnou linku jako tiskové materiály (assets/chetty-doc.css):
   Inter na text, Source Serif 4 na čísla a citace, fialová #6D3F9E.
   Stránky jsou statické — žádný framework, žádné externí volání.
   --------------------------------------------------------------- */

:root{
  --ink:#141317;
  --ink-soft:#3D3B45;
  --body:#5F5D69;
  --muted:#9A98A3;
  --accent:#6D3F9E;
  --accent-soft:#EDE6F5;
  --paper:#FAF9FB;
  --rule:#E6E5EA;
  --dark:#141317;
  --dark-rule:#2E2C36;
  --dark-body:#B4B1BE;
  --serif:"Source Serif 4",Georgia,serif;
  --sans:"Inter",-apple-system,"Segoe UI",sans-serif;
  --wrap:1120px;
  --gut:32px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:#fff;color:var(--body);
  font-family:var(--sans);font-size:17px;line-height:1.65;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:inherit}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gut)}
.ink{color:var(--ink)}
.serif{font-family:var(--serif)}

/* ---------- navigace ---------- */
.nav{
  position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--rule);
}
.nav .wrap{display:flex;align-items:center;gap:28px;height:64px}
.logo{font-size:15px;font-weight:700;letter-spacing:.24em;color:var(--ink);text-decoration:none}
.logo b{color:var(--accent);font-weight:700}
.nav nav{display:flex;gap:22px;margin-left:auto}
.nav nav a{
  font-size:14px;color:var(--body);text-decoration:none;padding:4px 0;
  border-bottom:1px solid transparent;
}
.nav nav a:hover{color:var(--ink);border-bottom-color:var(--accent)}
.nav .btn{margin-left:8px}

/* ---------- tlačítka ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;
  font-size:15px;font-weight:600;letter-spacing:-.005em;
  padding:12px 22px;border-radius:999px;text-decoration:none;
  border:1px solid transparent;cursor:pointer;transition:.15s ease;
}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:#5B3285}
.btn-ghost{border-color:var(--rule);color:var(--ink);background:#fff}
.btn-ghost:hover{border-color:var(--ink)}
.btn-light{background:#fff;color:var(--ink)}
.btn-light:hover{background:#F1EEF6}
.btn-outline-light{border-color:var(--dark-rule);color:#fff}
.btn-outline-light:hover{border-color:#fff}
.btn:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible{
  outline:2px solid var(--accent);outline-offset:3px;
}
.btn.sm{font-size:14px;padding:9px 18px}

/* ---------- typografie sekcí ---------- */
.kicker{
  font-size:12px;font-weight:700;letter-spacing:.22em;text-transform:uppercase;
  color:var(--accent);margin:0 0 16px;
}
.kicker.on-dark{color:#B79BDA}
h1{
  font-size:clamp(38px,5.4vw,60px);line-height:1.06;letter-spacing:-.03em;
  font-weight:700;color:var(--ink);margin:0;
}
h2{
  font-size:clamp(27px,3.2vw,36px);line-height:1.16;letter-spacing:-.025em;
  font-weight:700;color:var(--ink);margin:0 0 14px;
}
h3{font-size:19px;line-height:1.35;letter-spacing:-.012em;font-weight:600;color:var(--ink);margin:0 0 8px}
.lead{font-size:19px;line-height:1.6;color:var(--ink-soft);margin:18px 0 0;max-width:34em}
.sec{padding:84px 0}
.sec.tight{padding:60px 0}
.sec.paper{background:var(--paper);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.sec-head{max-width:38em;margin-bottom:40px}
.sec-head p{font-size:18px;margin:0}

/* ---------- hero ---------- */
.hero{background:var(--dark);color:var(--dark-body);padding:96px 0 88px;overflow:hidden}
.hero h1{color:#fff}
.hero h1 em{font-style:normal;color:#B79BDA}
.hero .lead{color:var(--dark-body);font-size:20px}
.hero-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:56px;align-items:center}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:32px}
.cta-note{font-size:14px;color:var(--muted);margin:14px 0 0}

/* ukázka vyhledávání v hero */
.demo-card{
  background:#1C1A21;border:1px solid var(--dark-rule);border-radius:14px;
  padding:22px 22px 18px;box-shadow:0 24px 60px rgba(0,0,0,.35);
}
.demo-bar{
  display:flex;align-items:center;gap:10px;background:#26232C;
  border:1px solid #35323E;border-radius:999px;padding:11px 16px;color:#fff;font-size:15px;
}
.demo-bar svg{width:16px;height:16px;color:#B79BDA;flex:0 0 auto}
.demo-bar .caret{width:1px;height:17px;background:#B79BDA;margin-left:2px;animation:blink 1.1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.demo-list{margin:16px 0 0;padding:0;list-style:none}
.demo-list li{
  display:flex;gap:12px;align-items:flex-start;
  padding:11px 0;border-top:1px solid var(--dark-rule);
}
.demo-list .thumb{
  width:34px;height:34px;border-radius:7px;background:#2C2934;flex:0 0 auto;
  display:flex;align-items:center;justify-content:center;color:#B79BDA;font-size:12px;font-weight:600;
}
.demo-list .t{color:#fff;font-size:14.5px;line-height:1.35}
.demo-list .m{color:var(--muted);font-size:12.5px;margin-top:2px}
.demo-foot{font-size:12.5px;color:var(--muted);margin-top:14px;padding-top:12px;border-top:1px solid var(--dark-rule)}

/* ---------- pruh s číslem ---------- */
.stat{display:grid;grid-template-columns:auto 1fr;gap:44px;align-items:center}
.stat .big{
  font-family:var(--serif);font-size:clamp(62px,9vw,104px);line-height:.9;
  color:var(--accent);letter-spacing:-.02em;
}
.stat .big small{display:block;font-size:15px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-family:var(--sans);margin-top:14px}
.stat p{font-size:20px;line-height:1.55;color:var(--ink-soft);margin:0}
.source{font-size:13px;color:var(--muted);margin-top:12px}

/* ---------- karty ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.card{border:1px solid var(--rule);border-radius:12px;padding:26px 24px;background:#fff}
.card .ic{
  width:38px;height:38px;border-radius:10px;background:var(--accent-soft);
  display:flex;align-items:center;justify-content:center;color:var(--accent);margin-bottom:18px;
}
.card .ic svg{width:19px;height:19px}
.card p{font-size:15.5px;line-height:1.6;margin:0}

/* ---------- dvojice dotaz → nález ---------- */
.pairs{border-top:1px solid var(--rule)}
.pair{
  display:grid;grid-template-columns:1fr auto 1fr;gap:26px;align-items:center;
  padding:20px 0;border-bottom:1px solid var(--rule);
}
.pair .q{font-family:var(--serif);font-size:19px;color:var(--ink);line-height:1.4}
.pair .a{font-size:15.5px;color:var(--body)}
.pair .a b{color:var(--ink);font-weight:600}
.pair .arr{color:var(--accent);font-size:20px;line-height:1}
.pair .fail{color:var(--muted);font-size:13.5px;display:block;margin-top:3px}

/* ---------- kroky ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;counter-reset:s}
.step{position:relative;padding-top:26px;border-top:2px solid var(--ink)}
.step:before{
  counter-increment:s;content:"0" counter(s);
  font-family:var(--serif);font-size:15px;color:var(--accent);
  position:absolute;top:10px;left:0;letter-spacing:.1em;
}
.step p{font-size:15.5px;margin:0}

/* ---------- pro koho ---------- */
.fit{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.fit .f{border-left:2px solid var(--accent);padding-left:18px}
.fit .f .l{font-size:12px;font-weight:700;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.fit .f h3{margin:6px 0 6px}
.fit .f p{font-size:15px;margin:0}

/* ---------- otázky ---------- */
.faq{border-top:1px solid var(--rule);max-width:52em}
.faq details{border-bottom:1px solid var(--rule)}
.faq summary{
  list-style:none;cursor:pointer;padding:20px 0;
  font-size:18px;font-weight:600;color:var(--ink);
  display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";color:var(--accent);font-size:22px;font-weight:400;line-height:1}
.faq details[open] summary:after{content:"–"}
.faq .ans{padding:0 0 22px;font-size:16px;max-width:44em}
.faq .ans p{margin:0 0 10px}
.faq .ans p:last-child{margin:0}

/* ---------- závěrečná výzva s formulářem ---------- */
.cta{background:var(--dark);color:var(--dark-body);padding:88px 0}
.cta h2{color:#fff}
.cta .lead{color:var(--dark-body)}
.cta-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.form{background:#1C1A21;border:1px solid var(--dark-rule);border-radius:14px;padding:26px}
.form label{display:block;font-size:13px;letter-spacing:.04em;color:var(--muted);margin:0 0 6px}
.form .f{margin-bottom:16px}
.form input{
  width:100%;background:#26232C;border:1px solid #35323E;border-radius:9px;
  padding:12px 14px;color:#fff;font-family:var(--sans);font-size:15px;
}
.form input::placeholder{color:#6E6B77}
.form .btn{width:100%;justify-content:center}
.form .fine{font-size:12.5px;color:var(--muted);margin:14px 0 0;line-height:1.5}
.checklist{list-style:none;margin:26px 0 0;padding:0}
.checklist li{position:relative;padding-left:26px;margin-bottom:12px;font-size:16px;color:var(--dark-body)}
.checklist li:before{
  content:"";position:absolute;left:0;top:8px;width:8px;height:8px;border-radius:50%;
  background:var(--accent);
}
.checklist li b{color:#fff;font-weight:600}

/* ---------- patička ---------- */
.foot{background:#0F0E12;color:var(--muted);padding:44px 0;font-size:14px}
.foot .wrap{display:flex;flex-wrap:wrap;gap:20px;align-items:center;justify-content:space-between}
.foot a{color:var(--dark-body);text-decoration:none}
.foot a:hover{color:#fff}
.foot .links{display:flex;gap:20px;flex-wrap:wrap}

/* ---------- responzivita ---------- */
@media (max-width:960px){
  .hero-grid,.cta-grid{grid-template-columns:1fr;gap:40px}
  .cards,.steps,.fit{grid-template-columns:1fr 1fr}
  .stat{grid-template-columns:1fr;gap:20px}
}
@media (max-width:680px){
  body{font-size:16px}
  :root{--gut:20px}
  .sec{padding:60px 0}
  .hero{padding:64px 0 60px}
  .cards,.steps,.fit{grid-template-columns:1fr}
  .pair{grid-template-columns:1fr;gap:8px}
  .pair .arr{display:none}
  .nav nav{display:none}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .demo-bar .caret{animation:none}
}