/* AI Teplice — sdílené styly (styl: čistý produktový minimalismus) */
:root{
  --bg:#ffffff; --bg2:#f5f5f7; --ink:#1d1d1f; --sub:#6e6e73; --acc:#0071e3;
  --acc-d:#0060c0; --line:#e8e8ed; --r:20px; --max:1080px; --maxw:1240px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text",Inter,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--ink);line-height:1.5;font-size:17px}
img{max-width:100%;display:block}
a{color:var(--acc);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}
.wrapw{max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.78);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid rgba(0,0,0,.06)}
.nav .in{max-width:var(--maxw);margin:0 auto;padding:0 22px;height:52px;display:flex;align-items:center;gap:26px}
.nav .logo{font-weight:700;font-size:1.05rem;color:var(--ink);letter-spacing:-.02em}
.nav .logo:hover{text-decoration:none}
.nav .logo span{color:var(--acc)}
.nav .links{display:flex;gap:22px;margin-left:auto;align-items:center}
.nav .links a{color:#424245;font-size:.86rem;transition:color .15s}
.nav .links a:hover{color:var(--ink);text-decoration:none}
.nav .links a.on{color:var(--acc);font-weight:600}
.nav .cta{background:var(--acc);color:#fff;padding:7px 15px;border-radius:980px;font-size:.85rem;font-weight:500}
.nav .cta:hover{background:var(--acc-d);text-decoration:none;color:#fff}
.nav .burger{display:none;margin-left:auto;background:none;border:0;font-size:1.5rem;color:var(--ink);cursor:pointer;padding:6px}
@media(max-width:840px){
  .nav .links{display:none;position:absolute;top:52px;left:0;right:0;background:rgba(255,255,255,.97);backdrop-filter:blur(20px);flex-direction:column;padding:18px 22px 22px;gap:16px;border-bottom:1px solid var(--line);align-items:flex-start}
  .nav .links.open{display:flex}
  .nav .burger{display:block}
}

/* ---------- typografie / sekce ---------- */
section{padding:96px 0}
section.alt{background:var(--bg2)}
.kick{color:var(--acc);font-weight:600;font-size:.85rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:12px}
h1{font-size:clamp(2.6rem,6.5vw,4.4rem);line-height:1.05;letter-spacing:-.03em;font-weight:700}
h2{font-size:clamp(1.9rem,4.2vw,3rem);line-height:1.08;letter-spacing:-.025em;font-weight:700}
h3{font-size:1.25rem;letter-spacing:-.015em;font-weight:600}
.lead{color:var(--sub);font-size:clamp(1.05rem,2vw,1.3rem);line-height:1.5;max-width:680px}
.sh{text-align:center;margin-bottom:56px}
.sh .lead{margin:16px auto 0}
.grad{background:linear-gradient(90deg,#0071e3,#40a0ff 55%,#7ac7ff);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- tlačítka ---------- */
.btn{display:inline-block;padding:13px 26px;border-radius:980px;font-size:1rem;font-weight:500;transition:all .18s;cursor:pointer;border:0}
.btn:hover{text-decoration:none}
.btn-acc{background:var(--acc);color:#fff}
.btn-acc:hover{background:var(--acc-d);transform:translateY(-1px);color:#fff}
.btn-ghost{background:transparent;color:var(--acc);border:1px solid var(--acc)}
.btn-ghost:hover{background:var(--acc);color:#fff}
.btnrow{display:flex;gap:14px;flex-wrap:wrap}

/* ---------- karty ---------- */
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.g2,.g3,.g4{grid-template-columns:1fr}}
.card{background:var(--bg2);border-radius:var(--r);padding:30px;transition:transform .22s,box-shadow .22s}
section.alt .card{background:#fff}
.card:hover{transform:translateY(-4px);box-shadow:0 18px 44px rgba(0,0,0,.09)}
.card .e{font-size:1.9rem;margin-bottom:14px}
.card h3{margin-bottom:8px}
.card p{color:var(--sub);font-size:.95rem}
.card .price{margin-top:14px;font-weight:600;font-size:.95rem}
.card .price small{color:var(--sub);font-weight:400}

/* ---------- metriky ---------- */
.mband{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;text-align:center}
@media(max-width:700px){.mband{grid-template-columns:repeat(2,1fr)}}
.mb .n{font-size:clamp(2rem,4.5vw,3rem);font-weight:700;letter-spacing:-.03em;background:linear-gradient(90deg,#0071e3,#40a0ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.mb .l{color:var(--sub);font-size:.88rem;margin-top:6px}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.reveal.vis{opacity:1;transform:none}

/* ---------- footer ---------- */
footer{background:var(--bg2);padding:56px 0 40px;border-top:1px solid var(--line)}
footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;max-width:var(--max);margin:0 auto;padding:0 22px}
@media(max-width:700px){footer .cols{grid-template-columns:1fr}}
footer h4{font-size:.85rem;margin-bottom:12px}
footer a{color:var(--sub);font-size:.85rem;display:block;margin-bottom:8px}
footer a:hover{color:var(--ink)}
footer p{color:var(--sub);font-size:.85rem}
footer .fin{max-width:var(--max);margin:36px auto 0;padding:18px 22px 0;border-top:1px solid var(--line);color:#a1a1a6;font-size:.78rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

/* ---------- chat widget (Bit) ---------- */
.fab{position:fixed;right:20px;bottom:20px;z-index:90;width:58px;height:58px;border-radius:50%;background:var(--acc);color:#fff;border:0;font-size:1.5rem;cursor:pointer;box-shadow:0 10px 28px rgba(0,113,227,.4);transition:transform .18s}
.fab:hover{transform:scale(1.07)}
.chatbox{position:fixed;right:20px;bottom:90px;z-index:95;width:min(380px,calc(100vw - 32px));height:min(560px,calc(100dvh - 130px));background:#fff;border-radius:22px;box-shadow:0 24px 70px rgba(0,0,0,.24);display:none;flex-direction:column;overflow:hidden;border:1px solid var(--line)}
.chatbox.open{display:flex}
.chatbox .head{background:linear-gradient(120deg,#0071e3,#3d9bff);color:#fff;padding:15px 18px;display:flex;align-items:center;gap:11px}
.chatbox .head .ava{width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,.22);display:grid;place-items:center;font-size:1.15rem}
.chatbox .head .t{font-weight:600;font-size:.95rem}
.chatbox .head .s{font-size:.74rem;opacity:.85}
.chatbox .head .x{margin-left:auto;background:none;border:0;color:#fff;font-size:1.25rem;cursor:pointer;opacity:.85;padding:4px}
.chatbox .msgs{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:10px;background:#f9f9fb}
.chatbox .m{max-width:84%;padding:10px 14px;border-radius:16px;font-size:.9rem;line-height:1.45;white-space:pre-wrap;word-break:break-word}
.chatbox .m.bot{background:#eef1f6;color:var(--ink);border-bottom-left-radius:6px;align-self:flex-start}
.chatbox .m.me{background:var(--acc);color:#fff;border-bottom-right-radius:6px;align-self:flex-end}
.chatbox .m.typing{color:var(--sub);font-style:italic}
.chatbox .inrow{display:flex;gap:8px;padding:12px;border-top:1px solid var(--line);background:#fff}
.chatbox .inrow input{flex:1;border:1px solid var(--line);border-radius:980px;padding:11px 16px;font-size:16px;outline:none;font-family:inherit}
.chatbox .inrow input:focus{border-color:var(--acc)}
.chatbox .inrow button{background:var(--acc);color:#fff;border:0;border-radius:50%;width:42px;height:42px;font-size:1.05rem;cursor:pointer;flex-shrink:0}
.chatbox .hint{font-size:.7rem;color:#a1a1a6;text-align:center;padding:0 12px 10px;background:#fff}

/* ---------- hero obrázky ---------- */
.heroimg{border-radius:26px;overflow:hidden;box-shadow:0 28px 80px rgba(0,0,0,.16)}
.heroimg img{width:100%}

/* ---------- reference / portfolio ---------- */
.ref{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:transform .22s,box-shadow .22s;display:flex;flex-direction:column}
.ref:hover{transform:translateY(-5px);box-shadow:0 22px 54px rgba(0,0,0,.12)}
.ref .shot{aspect-ratio:16/10;overflow:hidden;background:var(--bg2)}
.ref .shot img{width:100%;height:100%;object-fit:cover;object-position:top;transition:transform .5s}
.ref:hover .shot img{transform:scale(1.03)}
.ref .body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:8px;flex:1}
.ref .tag{font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.07em;color:var(--acc)}
.ref p{color:var(--sub);font-size:.88rem;flex:1}
.ref .go{font-size:.87rem;font-weight:500}

/* ---------- kalkulačka ---------- */
.calc{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px}
.calc .opts{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
@media(max-width:800px){.calc .opts{grid-template-columns:repeat(2,1fr)}}
.calc .opt{border:1.5px solid var(--line);border-radius:14px;padding:16px 10px;text-align:center;cursor:pointer;transition:all .15s}
.calc .opt:hover{border-color:#b8c4d6}
.calc .opt.on{border-color:var(--acc);background:#f0f7ff}
.calc .opt .e{font-size:1.5rem}
.calc .opt .t{font-size:.82rem;font-weight:600;margin-top:6px}
.calc .out{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;margin-top:22px;padding-top:22px;border-top:1px solid var(--line)}
.calc .price{font-size:2.2rem;font-weight:700;letter-spacing:-.02em}
.calc .term{color:var(--sub);font-size:.9rem;margin-top:4px}
.calc .note{margin-top:16px;color:#a1a1a6;font-size:.78rem}

/* ---------- FAQ ---------- */
.faq{max-width:760px;margin:0 auto}
.faq details{border-bottom:1px solid var(--line);padding:18px 4px}
.faq summary{cursor:pointer;font-weight:600;font-size:1.02rem;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--acc);font-size:1.3rem;font-weight:400}
.faq details[open] summary::after{content:"–"}
.faq details p{color:var(--sub);font-size:.93rem;margin-top:10px;max-width:640px}

/* ---------- formulář ---------- */
.form{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:30px;max-width:640px;margin:0 auto}
.form label{display:block;font-size:.82rem;font-weight:600;margin:16px 0 6px}
.form input,.form textarea,.form select{width:100%;border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-size:16px;font-family:inherit;outline:none;background:#fff}
.form input:focus,.form textarea:focus{border-color:var(--acc)}
.form textarea{min-height:110px;resize:vertical}
.form .ok,.form .err{margin-top:14px;padding:12px 16px;border-radius:12px;font-size:.9rem;display:none}
.form .ok{background:#e8f7ee;color:#1a7f45}
.form .err{background:#fdeaea;color:#c0392b}

/* ---------- timeline (příběh) ---------- */
.tl{max-width:760px;margin:0 auto;position:relative;padding-left:34px}
.tl::before{content:"";position:absolute;left:10px;top:6px;bottom:6px;width:2px;background:linear-gradient(#0071e3,#7ac7ff)}
.tl .step{position:relative;margin-bottom:38px}
.tl .step::before{content:"";position:absolute;left:-30px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--acc);box-shadow:0 0 0 4px #e3f0fd}
.tl .step .y{font-size:.78rem;font-weight:700;color:var(--acc);text-transform:uppercase;letter-spacing:.06em}
.tl .step h3{margin:4px 0 6px}
.tl .step p{color:var(--sub);font-size:.95rem}

/* ---------- velký CTA pás ---------- */
.ctaband{background:#1d1d1f;color:#fff;text-align:center;border-radius:26px;padding:64px 30px;max-width:var(--max);margin:0 auto}
.ctaband h2{color:#fff}
.ctaband p{color:#a1a1a6;margin:14px auto 26px;max-width:520px}