/* Core theme (zůstává stejné jako dřív, zkráceno pro přehlednost) */
:root{
  --bg:#0b1118; --bg2:#0e1420; --fg:#d8e0ea; --muted:#9aa8b6;
  --accent:#00ffe0; --accent2:#3ea6ff; --card:#121a25; --line:#1d2734; --shadow:0 10px 30px rgba(0,0,0,.35)
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:'Exo 2',system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;line-height:1.6}
img{max-width:100%;display:block}
.container{width:min(1200px, 92%);margin:0 auto}
.narrow{width:min(800px, 92%);margin:0 auto}
.two-col{display:grid;grid-template-columns:1.2fr 1fr;gap:2rem}
@media (max-width: 900px){.two-col{grid-template-columns:1fr;gap:1.25rem}}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:linear-gradient(180deg, rgba(10,14,20,.95), rgba(10,14,20,.6) 80%, transparent);backdrop-filter:blur(6px);border-bottom:1px solid rgba(255,255,255,.05)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:.75rem 0}
.brand{display:flex;align-items:center;gap:.6rem;font-family:'Orbitron', sans-serif;font-weight:700;letter-spacing:.04em}
.brand-logo{color:var(--accent)}
.brand-name{font-size:1rem}
.menu a{color:var(--fg);text-decoration:none;margin-left:1rem;opacity:.85}
.menu a:hover{color:var(--accent)}
@media (max-width:640px){.menu{display:none}}

/* Hero */
.hero{position:relative;min-height:78vh;display:flex;align-items:center;justify-content:center;overflow:hidden;border-bottom:1px solid var(--line)}
.hero-bg{position:absolute;inset:0;display:grid;grid-template-columns:1fr 1fr}
.hero-bg img{height:100%;width:100%;object-fit:cover;filter:contrast(1.05) saturate(1.05)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(90deg, rgba(0,0,0,.55), rgba(0,0,0,.2), rgba(0,0,0,.55))}
.hero-content{position:relative;text-align:center;z-index:2}
.hero h1{font-family:'Orbitron', sans-serif;font-size:clamp(2rem, 5vw, 3.5rem);letter-spacing:.06em;margin:0 0 .5rem}
.subtitle{opacity:.9;margin:.25rem auto 1rem;max-width:60ch}
.cta{display:flex;gap:.75rem;justify-content:center}
.btn{display:inline-block;padding:.7rem 1.1rem;border-radius:.6rem;border:1px solid var(--accent);text-decoration:none;font-weight:600}
.btn.primary{background:var(--accent);color:#001f1d;border-color:transparent}
.btn.ghost{color:var(--accent);background:transparent}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow)}

/* Sections */
.section{padding:3.5rem 0;border-bottom:1px solid var(--line);background:linear-gradient(180deg,var(--bg),var(--bg2))}
.section h2{font-family:'Orbitron', sans-serif;letter-spacing:.04em}
.section .lead{opacity:.9}

/* Original layout tweak (stack text under media) */
.original .two-col{grid-template-columns:1fr}
.original .text{max-width:800px;margin:0 auto}
.scan-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
@media (max-width:720px){.scan-grid{grid-template-columns:repeat(2,1fr)}}
.scan-grid img{border:1px solid var(--line);filter:contrast(1.05);border-radius:.5rem;box-shadow:var(--shadow)}
.infobox{margin:1rem 0;padding:.75rem 1rem;border:1px solid var(--line);border-radius:.6rem;background:linear-gradient(180deg,#0e1520,#0c121b)}
.infobox .label{font-size:.8rem;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
.infobox .value{font-weight:600}

/* Compare slider */
.compare{margin:2rem 0}
.compare-wrapper{position:relative; overflow:hidden; border-radius:.75rem; border:1px solid var(--line); box-shadow:var(--shadow); cursor:ew-resize}
.compare-wrapper img{display:block;width:100%;height:auto;user-select:none;pointer-events:none}
.compare-resize{position:absolute;inset:0;width:50%;overflow:hidden;border-right:1px solid rgba(255,255,255,.3)}
.compare-range{position:absolute;inset:0;width:100%;opacity:0}
.compare-handle{position:absolute;top:0;bottom:0;left:50%;width:3px;background:var(--accent);box-shadow:0 0 0 1px rgba(0,0,0,.4)}
.compare-handle::after{content:'';position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:44px;height:44px;border-radius:50%;border:3px solid var(--accent);background:rgba(5,16,21,.9);box-shadow:0 0 14px rgba(0,255,224,.35)}
.compare-range:focus-visible + .compare-handle{outline:3px solid var(--accent2)}
.compare-handle{cursor:grab}
.compare-handle:active{cursor:grabbing}

/* Uniform gallery cards (fix jumpy layout) */
.gallery .grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
@media (max-width:900px){.gallery .grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:540px){.gallery .grid{grid-template-columns:1fr}}
.gallery .card{
  position:relative;border:1px solid var(--line);border-radius:.6rem;overflow:hidden;
  background:var(--card);cursor:pointer;transition:transform .2s ease, box-shadow .2s ease;
  aspect-ratio:16/9; /* stejné proporce pro všechny náhledy */
}
.gallery .card:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(0,0,0,.35)}
.gallery .card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}

/* Lightbox arrows */
.lightbox .nav{
  position:absolute;top:50%;transform:translateY(-50%);width:48px;height:48px;border-radius:50%;
  border:1px solid var(--line);background:#0e1520;color:#fff;font-size:28px;display:flex;
  align-items:center;justify-content:center;cursor:pointer;opacity:.85
}
.lightbox .nav:hover{opacity:1}
.lightbox .nav.prev{left:22px}
.lightbox .nav.next{right:22px}

/* About */
.about .links{display:flex;gap:1.25rem;margin-top:0.75rem;align-items:center;flex-wrap:wrap}

/* Footer */
.site-footer{padding:2rem 0;background:#090e14;border-top:1px solid var(--line)}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:1rem}
.footer-inner .logo{font-family:'Orbitron', sans-serif;color:var(--accent)}
.footer-inner .legal{color:var(--muted);font-size:.9rem}
@media (max-width:720px){.footer-inner{flex-direction:column;text-align:center}}

/* Back to top */
#backToTop{
  position:fixed;right:18px;bottom:18px;width:44px;height:44px;border-radius:50%;
  border:1px solid var(--line);background:#101824;color:#fff;font-size:22px;cursor:pointer;
  display:none;align-items:center;justify-content:center;box-shadow:0 6px 18px rgba(0,0,0,.35);z-index:120
}
#backToTop.show{display:flex}

/* Accessibility */
:focus-visible{outline:2px dashed var(--accent);outline-offset:2px}

/* Uniform gallery cards */
.gallery .grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
@media (max-width:900px){.gallery .grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:540px){.gallery .grid{grid-template-columns:1fr}}
.gallery .card{position:relative;border:1px solid var(--line);border-radius:.6rem;overflow:hidden;background:var(--card);cursor:pointer;transition:transform .2s ease, box-shadow .2s ease;aspect-ratio:16/9}
.gallery .card:hover{transform:translateY(-2px); box-shadow:0 10px 24px rgba(0,0,0,.35)}
.gallery .card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}

/* --- Fixes 2025-10-18 --- */
/* Lightbox hidden by default, only visible when .open */
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.85);display:none;align-items:center;justify-content:center;z-index:9999;}
.lightbox.open{display:flex;}
.lightbox .nav,.lightbox .close{position:absolute;top:50%;transform:translateY(-50%);}
.lightbox .nav.prev{left:1rem;}
.lightbox .nav.next{right:1rem;}
.lightbox .close{top:1rem;right:1rem;transform:none;}
/* Prevent stray alt text when closed */
.lightbox:not(.open) img{display:none}

/* Compare slider behaviour and stacking */
.compare-wrapper{position:relative;overflow:hidden;cursor:ew-resize;}
.compare-wrapper img{display:block;width:100%;height:auto;user-select:none;pointer-events:none;}
.compare-resize{position:absolute;inset:0;overflow:hidden;border-right:2px solid #11e1f3}
.compare-range{position:absolute;left:0;right:0;bottom:-2rem;opacity:0;pointer-events:none}
.compare-handle{position:absolute;top:0;bottom:0;width:0;border-left:2px solid #11e1f3;pointer-events:none}
.compare-handle::after{content:'';position:absolute;left:0;top:50%;width:20px;height:20px;border:2px solid #11e1f3;border-radius:50%;background:#000;transform:translate(-50%,-50%);box-shadow:0 0 0 2px rgba(0,0,0,.2);}

/* Hero single image */
.hero .bg-single{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.95}

/* === 2025-10-18 hotfix === */
.lightbox{position:fixed;inset:0;display:none;align-items:center;justify-content:center;background:rgba(0,0,0,.85);z-index:9999}
.lightbox.open{display:flex}
.lightbox img{max-width:92vw;max-height:90vh}
.lightbox .nav{font-size:2rem;line-height:1;border:0;background:#111a;color:#fff;border-radius:999px;width:44px;height:44px;display:flex;align-items:center;justify-content:center;cursor:pointer}
.lightbox .nav.prev{position:absolute;left:1rem;top:50%;transform:translateY(-50%)}
.lightbox .nav.next{position:absolute;right:1rem;top:50%;transform:translateY(-50%)}
.lightbox .close{position:absolute;top:1rem;right:1rem;background:#111a;color:#fff;border:0;width:44px;height:44px;border-radius:999px;cursor:pointer}
.compare-wrapper{position:relative;overflow:hidden;cursor:ew-resize}
.compare-wrapper img{display:block;width:100%;height:auto;user-select:none;pointer-events:none}
.compare-resize{position:absolute;inset:0;overflow:hidden;border-right:2px solid #11e1f3}
.compare-handle{position:absolute;top:0;bottom:0;width:0;border-left:2px solid #11e1f3;z-index:2;pointer-events:none}
.compare-handle::after{content:'';position:absolute;left:-10px;top:50%;width:20px;height:20px;border:2px solid #11e1f3;border-radius:50%;background:#000;transform:translate(-50%,-50%)}

/* === Why section === */
.section.why {padding-top:3rem;padding-bottom:2rem}
.section.why h2{margin-bottom:1rem}
.why-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem;max-width:1000px;margin:0 auto 1.25rem}
.why-grid ul{list-style:disc;padding-left:1.2rem}
.pull-quote{max-width:1000px;margin:0 auto;border-left:4px solid #11e1f3;padding:1rem 1.25rem 1rem 1rem;color:#bcd;opacity:.95}

/* === Gallery hover flip === */
.grid .card{position:relative;overflow:hidden}
.grid .card img{display:block;width:100%;height:auto;transition:opacity .25s ease;position:absolute;inset:0;object-fit:cover}
.grid .card .img-old{opacity:1}
.grid .card .img-new{opacity:0}
.grid .card:hover .img-old{opacity:0}
.grid .card:hover .img-new{opacity:1}
/* Touch: allow tap to flip by toggling .flip class */
.grid .card.flip .img-old{opacity:0}
.grid .card.flip .img-new{opacity:1}

/* compare sizing fix */
.compare figure,.compare,.compare-wrapper{width:100%}
.compare-wrapper{isolation:isolate}
.compare-wrapper img{width:100%;height:auto;display:block;object-fit:cover}

/* gallery sizing fix */
.section.gallery .grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.25rem}
.section.gallery .grid .card{position:relative;overflow:hidden;border-radius:14px;aspect-ratio:16/9;background:linear-gradient(#0e141c,#0e141c)}
.section.gallery .grid .card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}

/* 2025-10-18: Themed Back-to-Top button */
#backToTop{background:#0f1824;color:#11e1f3;border:1px solid rgba(17,225,243,.35);box-shadow:0 4px 18px rgba(17,225,243,.15)}
#backToTop:hover{background:#111a24;color:#a9f6ff;border-color:rgba(17,225,243,.6);box-shadow:0 6px 22px rgba(17,225,243,.25)}

/* 2025-10-18: Compare handle micro‑alignment */
.compare-handle{border-left:2px solid #11e1f3}
.compare-handle::after{left:0;transform:translate(calc(-50% + 1px), -50%);} /* +1px compensates divider thickness */

.links a{color:#11e1f3;text-decoration:none;border-bottom:1px dotted rgba(17,225,243,.35);padding-bottom:2px}
.links a:hover{border-bottom-color:rgba(17,225,243,.7)}