:root{
  color-scheme:light dark;
  --bg:#f4f4f5;
  --card:#fff;
  --tile:#fff;
  --ink:#0b0b0c;
  --on-ink:#fff;
  --mute:#5b5b62;
  --line:#e6e6e8;
  --accent:#3b82f6;
  --bar:rgb(244 244 245 / .85);
  --hover:rgba(0,0,0,.07);
  --field:#fafafa;
  --field-hover:#cfcfd3;
  --ok:#0a7a3b;
  --err:#c62828;
  --r:clamp(18px,3vw,32px);
  --gap:clamp(14px,2.4vw,28px);
  --pad:clamp(22px,5vw,72px);
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --shadow:0 1px 2px rgba(0,0,0,.04),0 12px 40px -12px rgba(0,0,0,.14);
  --ease:cubic-bezier(.2,.7,.2,1);
  --spring:cubic-bezier(.3,1.25,.4,1);
}
/* Automatický noční režim podle nastavení zařízení */
@media (prefers-color-scheme:dark){
  :root{
    --bg:#0a0a0c;
    --card:#141417;
    --tile:#1c1c20;
    --ink:#f2f2f4;
    --on-ink:#0b0b0c;
    --mute:#a1a1aa;
    --line:#2a2a30;
    --accent:#60a5fa;
    --bar:rgb(10 10 12 / .85);
    --hover:rgba(255,255,255,.09);
    --field:#1a1a1e;
    --field-hover:#3d3d46;
    --ok:#4ade80;
    --err:#f87171;
    --shadow:0 1px 2px rgba(0,0,0,.5),0 12px 40px -12px rgba(0,0,0,.7);
  }
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 clamp(15px,1.1vw + 11px,18px)/1.6 var(--sans);-webkit-font-smoothing:antialiased}
img,svg{display:block;max-width:100%}
a{color:inherit}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:6px}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:var(--on-ink);padding:.6em 1em;border-radius:8px;z-index:20}
.skip:focus{left:8px}

/* ---------- Hlavička ---------- */
.top{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;
  padding:12px var(--gap);background:var(--bar);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  transition:box-shadow .3s}
.top.stuck{box-shadow:0 8px 24px -16px rgba(0,0,0,.35)}
.top .logo{flex-shrink:0;margin-right:8px}
.top nav{position:relative;display:flex;align-items:center;gap:2px;font-size:.92rem;min-width:0;overflow-x:auto;scrollbar-width:none}
.top nav::-webkit-scrollbar{display:none}
.top nav a{position:relative;z-index:1;text-decoration:none;padding:.5em 1em;border-radius:99px;white-space:nowrap;transition:background .3s var(--ease),color .35s var(--ease)}
.top nav a:hover{background:var(--hover)}
.top nav a[aria-current=true]{color:var(--on-ink)}
.top nav a[aria-current=true]:hover{background:none}
/* černá „pilulka“, která se plynule přesouvá mezi odkazy (poziciuje ji JS) */
.nav-pill{position:absolute;left:0;top:0;z-index:0;width:0;height:0;border-radius:99px;background:var(--ink);opacity:0;pointer-events:none;
  transition:transform .55s var(--spring),width .55s var(--spring),height .3s,opacity .25s}
.nav-pill.on{opacity:1}
/* pohyb pilulky řídí JS (kapalná animace), CSS animuje jen zobrazení */
.nav-pill{transition:opacity .25s}
.logo{display:inline-flex;align-items:flex-end;text-decoration:none;line-height:1}
.logo span{font:900 2rem/1 Arial,Helvetica,sans-serif;letter-spacing:-.04em}
.logo small{font-size:.6rem;margin:0 0 .25rem .15rem}

/* ---------- Karty ---------- */
main{display:grid;gap:var(--gap);padding:0 var(--gap) var(--gap);max-width:1400px;margin-inline:auto}
.card{background:var(--card);border-radius:var(--r);padding:var(--pad);box-shadow:var(--shadow);overflow:clip}
.copy{max-width:34rem}
h1,h2,h3{font-family:var(--serif);line-height:1.12;margin:0;text-wrap:balance;overflow-wrap:break-word;hyphens:auto}
h1{font-size:clamp(2rem,6.2vw,4.6rem);font-weight:700;letter-spacing:-.02em}
h2{font-size:clamp(1.6rem,3.6vw,2.7rem);font-weight:700;letter-spacing:-.01em}
.copy p{color:var(--mute);margin:1.7em 0 0;line-height:1.75;text-wrap:pretty}
.btn{display:inline-block;margin-top:2.2em;padding:.85em 1.6em;border:0;border-radius:99px;background:var(--ink);color:var(--on-ink);
  font-weight:600;text-decoration:none;cursor:pointer;transition:transform .25s var(--ease),box-shadow .25s}
.btn:hover{transform:translateY(-3px);box-shadow:0 10px 24px -8px rgba(0,0,0,.45)}
.btn:active{transform:translateY(0)}
.btn.ghost{background:none;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.btn.ghost:hover{background:var(--ink);color:var(--on-ink)}
.actions{display:flex;flex-wrap:wrap;gap:0 12px}

/* hero – animované podtržení */
.hero{min-height:min(72vh,640px);display:flex;align-items:center}
.hero .copy{max-width:52rem}
.mark{background:linear-gradient(var(--accent),var(--accent)) 0 92%/0 .13em no-repeat;
  -webkit-box-decoration-break:clone;box-decoration-break:clone;animation:underline 1.1s .35s var(--ease) forwards}
@keyframes underline{to{background-size:100% .13em}}
.hero .copy>p{max-width:30rem}

/* rozdělené karty */
.split{display:grid;gap:clamp(24px,5vw,64px);align-items:center}
@media(min-width:800px){.split{grid-template-columns:1fr 1fr}}
.split .copy{justify-self:center}

/* ---------- Balíček karet: každá karta ilustruje jeden bod vpravo ---------- */
.art{container-type:inline-size;display:grid;place-items:center}
.stack{--w:min(74cqi,340px);position:relative;width:var(--w);aspect-ratio:4/5;margin-top:calc(var(--w) * .34)}
.sc{--p:0;position:absolute;inset:0;display:flex;flex-direction:column;gap:.35em;padding:clamp(14px,6cqi,26px);
  border-radius:clamp(14px,4.5cqi,24px);color:#fff;z-index:calc(3 - var(--p));
  transform:translateY(calc(var(--p) * -13%)) scale(calc(1 - var(--p) * .05)) rotate(calc(var(--p) * -2deg));
  transition:transform .75s var(--spring);box-shadow:0 -8px 24px -14px rgba(0,0,0,.5)}
.sc:nth-child(1){background:#111}
.sc:nth-child(2){background:#1e40af}
.sc:nth-child(3){background:#47474e}
.sc:nth-child(1){--p:0}.sc:nth-child(2){--p:1}.sc:nth-child(3){--p:2}
.sc small{font:600 clamp(.68rem,2.6cqi,.85rem)/1 var(--sans);letter-spacing:.09em;text-transform:uppercase;opacity:.9}
.sc>:not(small){transition:opacity .4s .2s}
.sc:not(.front)>:not(small){opacity:0;transition-delay:0s}
.vis{display:flex;align-items:center;min-height:clamp(40px,16cqi,64px);margin-top:.7em}
.sc h4{margin:auto 0 0;font:700 clamp(1.2rem,7.2cqi,1.9rem)/1.1 var(--serif);letter-spacing:-.01em}
.sc p{margin:0;font-size:clamp(.78rem,3.2cqi,.92rem);line-height:1.4;opacity:.85}
.sc.front>p{opacity:.85}

/* rychlost: načítací lišta */
.bar{flex:1;height:10px;border-radius:99px;background:rgba(255,255,255,.18);overflow:hidden}
.bar i{display:block;height:100%;border-radius:inherit;background:#fff;transform-origin:left;transform:scaleX(0)}
.front .bar i{animation:load 1s .2s var(--ease) forwards}
@keyframes load{to{transform:scaleX(1)}}

/* bezpečnost: štít, který se „nakreslí“ */
.shield{width:clamp(36px,14cqi,52px);height:auto}
.sh,.ck{fill:none;stroke:#fff;stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:1;stroke-dashoffset:1}
.front .sh{animation:dash .9s .15s var(--ease) forwards}
.front .ck{animation:dash .5s .8s var(--ease) forwards}
@keyframes dash{to{stroke-dashoffset:0}}

/* každý displej: telefon, tablet, monitor */
.devs{display:flex;align-items:flex-end;gap:8px}
.devs i{display:block;border:2px solid #fff;border-radius:4px;transform:scale(0);transform-origin:bottom}
.devs i:nth-child(1){width:16px;height:28px}
.devs i:nth-child(2){width:28px;height:38px}
.devs i:nth-child(3){width:52px;height:34px}
.front .devs i{animation:pop .55s var(--spring) forwards}
.front .devs i:nth-child(2){animation-delay:.15s}
.front .devs i:nth-child(3){animation-delay:.3s}
@keyframes pop{to{transform:scale(1)}}

/* posouvání balíčku gestem (prst i myš) */
.stack{touch-action:pan-y;user-select:none;-webkit-user-select:none;cursor:grab}
.stack.drag{cursor:grabbing}
.sc{translate:calc(var(--dx,0) * 1px) 0;rotate:calc(var(--dx,0) * .04deg);
  transition:transform .75s var(--spring),translate .5s var(--spring),rotate .5s var(--spring)}
.stack.drag .sc{transition:transform .75s var(--spring)}
.split.held .why [aria-current=true]::after{animation-play-state:paused}

/* seznam vpravo = ovládání balíčku (automaticky se přepíná) */
.why{list-style:none;margin:2.2em 0 0;padding:0;display:grid;gap:.7em}
.why button{display:block;width:100%;text-align:left;background:none;border:0;border-radius:14px;padding:1em 1.1em 1.25em;cursor:pointer;
  color:var(--mute);position:relative;overflow:hidden;transition:background .3s,color .3s}
.why button:hover{background:var(--bg)}
.why strong{display:block;color:var(--ink);font-size:1.05em;margin-bottom:.3em}
.why span{display:block;font-size:.95em;line-height:1.65}
.why [aria-current=true]{background:var(--bg)}
.why [aria-current=true]::after{content:"";position:absolute;left:1em;right:1em;bottom:6px;height:2px;border-radius:2px;background:var(--accent);
  transform-origin:left;animation:tick var(--dur,5.5s) linear forwards}
@keyframes tick{from{transform:scaleX(0)}to{transform:scaleX(1)}}
.why:hover [aria-current=true]::after,.why:focus-within [aria-current=true]::after,.split.paused .why [aria-current=true]::after{animation-play-state:paused}

/* ---------- Ukázka e-shopu ---------- */
.demo{display:grid;gap:clamp(20px,4vw,44px)}
.demo .copy{max-width:40rem}
.browser{container-type:inline-size;background:var(--bg);border-radius:clamp(14px,2vw,24px);overflow:clip;box-shadow:var(--shadow);border:1px solid var(--line)}
.shop-head{display:flex;align-items:center;justify-content:space-between;padding:clamp(12px,2.5cqi,28px);background:var(--tile)}
.icons{display:flex;gap:6px}
.icon{position:relative;display:grid;place-items:center;width:44px;height:44px;border:0;background:none;border-radius:50%;cursor:pointer;transition:background .2s}
.icon:hover{background:var(--bg)}
.icon svg{width:26px;height:26px}
.cart b{position:absolute;top:-2px;right:-2px;min-width:1.3em;font-size:.8rem;text-align:center}
.cart.bump{animation:bump .45s var(--ease)}
@keyframes bump{40%{transform:scale(1.25)}}
.products{display:grid;gap:clamp(8px,1.6cqi,16px);padding:clamp(8px,1.6cqi,16px);grid-template-columns:repeat(auto-fit,minmax(min(100%,190px),1fr))}
.product{background:var(--tile);padding:clamp(14px,2.4cqi,28px);display:grid;gap:.5rem;border-radius:4px;transition:transform .35s var(--ease),box-shadow .35s}
.product:hover{transform:translateY(-4px);box-shadow:0 14px 30px -14px rgba(0,0,0,.3)}
.thumb{display:grid;place-items:center;aspect-ratio:1;color:var(--ink)}
.thumb svg{width:38%;transition:transform .5s var(--ease)}
.product:hover .thumb svg{transform:rotate(-8deg) scale(1.12)}
.row{display:flex;justify-content:space-between;align-items:baseline;gap:.6rem}
.product h3{font:700 1rem/1.3 var(--sans)}
.product select{border:0;background:none;font-weight:700;cursor:pointer;padding:2px}
.col{margin:0;font-size:.9rem}
.price{margin:.6rem 0 0;font-size:1.3rem}
.add{border:1px solid var(--ink);background:none;border-radius:99px;padding:.35em .9em;font-size:.82rem;font-weight:600;cursor:pointer;transition:background .2s,color .2s}
.add:hover{background:var(--ink);color:var(--on-ink)}

/* ---------- Postup: kroky propojené šipkami ---------- */
.steps{--sg:clamp(34px,5vw,54px);list-style:none;margin:0;padding:0;display:grid;gap:var(--sg);counter-reset:s}
.steps li{position:relative;padding-left:62px;counter-increment:s;view-timeline:--s block}
.steps li::before{content:counter(s);position:absolute;left:0;top:0;width:40px;height:40px;border-radius:50%;background:var(--ink);color:var(--on-ink);
  display:grid;place-items:center;font:700 1rem/1 var(--serif)}
/* čárkovaná čára zakončená šipkou k dalšímu kroku */
.steps li:not(:last-child)::after{content:"";position:absolute;left:10px;width:20px;top:48px;bottom:calc(6px - var(--sg));
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 14'%3E%3Cpath d='M2 4l5 6 5-6' fill='none' stroke='%233b82f6' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center bottom/14px 14px no-repeat,
    repeating-linear-gradient(to bottom,var(--accent) 0 5px,transparent 5px 11px) center top/2px calc(100% - 12px) no-repeat}
.steps h3{font:700 clamp(1.05rem,2.2vw,1.25rem)/1.3 var(--serif)}
.steps p{margin:.6em 0 0;line-height:1.65;color:var(--mute)}
@supports (animation-timeline:view()){
  .steps li:not(:last-child)::after{animation:draw linear both;animation-timeline:--s;animation-range:entry 40% entry 100%}
  @keyframes draw{from{clip-path:inset(0 0 100% 0)}to{clip-path:inset(0)}}
}

/* ---------- Formulář ---------- */
form{display:grid;gap:1rem}
label{display:grid;gap:.35rem;font-size:.88rem;font-weight:600}
input,textarea{width:100%;font-size:16px;padding:.8em 1em;border:1.5px solid var(--line);border-radius:14px;background:var(--field);transition:border-color .2s,background .2s,box-shadow .2s;resize:none}
input:hover,textarea:hover{border-color:var(--field-hover)}
input:focus,textarea:focus{outline:0;border-color:var(--ink);background:var(--card);box-shadow:0 0 0 4px rgba(59,130,246,.15)}
input:user-invalid,textarea:user-invalid{border-color:#d33}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
form .btn{justify-self:start;margin-top:.4rem}
form .btn[disabled]{opacity:.6;cursor:wait}
#status{margin:0;min-height:1.5em;font-size:.92rem}
#status.ok{color:var(--ok)}
#status.err{color:var(--err)}

.consent{margin:.2rem 0 0;font-size:.8rem;line-height:1.6;color:var(--mute)}
.consent a{text-underline-offset:2px}
.consent a:hover{color:var(--ink)}
.foot{display:flex;flex-direction:column;align-items:center;text-align:center;gap:10px;padding:28px var(--gap) 36px;max-width:1400px;margin-inline:auto;font-size:.85rem;line-height:1.7;color:var(--mute)}
.foot p{margin:0;max-width:62ch;text-wrap:balance}
.social{display:flex;justify-content:center;gap:6px}
.foot .icon{color:var(--mute);transition:background .2s,color .2s}
.foot .icon:hover{color:var(--ink)}

/* ---------- Mobil ---------- */
/* Produkty v ukázce: na úzkém mockupu horizontální posuvník s přichytáváním */
@container (max-width:560px){
  .products{grid-template-columns:none;grid-auto-flow:column;grid-auto-columns:min(78%,260px);overflow-x:auto;
    scroll-snap-type:x mandatory;scroll-padding-inline:12px;overscroll-behavior-x:contain;scrollbar-width:none}
  .products::-webkit-scrollbar{display:none}
  .product{scroll-snap-align:center}
}
@media (max-width:520px){
  .top{padding:10px 14px}
  .top nav{font-size:.82rem}
  .top nav a{padding:.45em .7em}
  .hero{min-height:auto;padding-block:clamp(56px,16vw,96px)}
  form .btn{justify-self:stretch;width:100%;text-align:center}
  .foot{padding-inline:20px}
}
@media (pointer:coarse){
  .btn,.add,.product select,input{min-height:44px}
}

/* ---------- Scroll animace  ---------- */
@supports (animation-timeline:view()){
  .reveal:not(.hero),.steps li{animation:rise linear both;animation-timeline:view();animation-range:entry 0% entry 45%}
  @keyframes rise{from{opacity:0;transform:translateY(48px) scale(.97)}to{opacity:1;transform:none}}
}

/* Záloha pro prohlížeče bez scroll-driven animací (třídu .fx přidává JS) */
.fx .reveal:not(.hero),.fx .steps li{opacity:0;transform:translateY(40px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.fx .reveal.in:not(.hero),.fx .steps li.in{opacity:1;transform:none}

@media (prefers-color-scheme:dark){
  .sc:nth-child(1){background:#2c2c32}
  .sc:nth-child(3){background:#55555e}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-delay:0s!important;animation-timeline:auto!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .mark{background-size:100% .13em}
  .why [aria-current=true]::after{animation:none!important}
}