:root{
  --gold:#ffcc00;
  --gold-hover:#ffd700;
  --overlay:rgba(0,0,0,0.6)
}
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial;color:#fff;background:#000;overflow-x:hidden;height:100%}
body{background:url("images/background.webp") center/cover fixed;min-height:100vh;position:relative}
body::before{content:"";position:fixed;inset:0;background:var(--overlay);z-index:0;pointer-events:none}
header,main,footer{position:relative;z-index:1}
header{text-align:center;padding:30px 20px 10px;background:rgba(255,255,255,0.4);border-bottom:1px solid rgba(255,255,255,0.4)}
header img{max-width:400px;width:100%;height:auto;display:block;margin:0 auto}
.subtitle{margin:12px 0 0;color:#000000b3;font-size:1.2rem;font-style:italic}
.main-nav{margin:20px 0}
.main-nav ul{list-style:none;padding:0;margin:0;display:flex;justify-content:center;gap:40px;flex-wrap:wrap}
.main-nav a{
  color:#fff;text-decoration:none;font-weight:700;font-size:1.3rem;text-transform:uppercase;
  padding:8px 16px;border-radius:6px;transition:all .3s
}
.main-nav a:hover,.main-nav a.active{background:var(--gold);color:#000}
.social-link{margin:0 15px;display:inline-block;transition:transform .2s}
.social-link:hover{transform:scale(1.2)}
.social-icon{height:28px;vertical-align:middle}
.container{max-width:1000px;margin:0 auto;padding:40px 16px 20px;opacity:0;transition:opacity .4s ease}
.container.loaded{opacity:1}
h2{border-bottom:1px solid rgba(255,255,255,0.2);padding-bottom:8px;text-align:center;margin:60px 0 30px;font-size:1.8rem}
ul.concerts{list-style:none;padding:0;margin:0}
ul.concerts li{margin:10px 0 18px;padding:12px 16px;background:rgba(0,0,0,0.3);border-radius:8px;box-shadow:0 2px 6px rgba(0,0,0,0.4);display:flex;flex-direction:column}
.concert-header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px}
.concert-info{display:flex;flex-direction:column;flex:1}
strong.date{font-weight:600;margin-right:10px}
.title-link,.contact-item a{color:#ffcc00;font-size:1.05rem;font-weight:600;text-decoration:none}
.title-link:hover,.contact-item a:hover{color:#ffd966}
.venue{font-size:0.95rem;color:#ddd;margin-top:4px}
.more-btn,.messenger-btn,.all-concerts-button{
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--gold);color:#000;padding:10px 24px;border-radius:6px;
  font-weight:700;font-size:1.1rem;text-decoration:none;
  box-shadow:0 4px 12px rgba(0,0,0,0.5);
  transition:background .3s,box-shadow .3s
}
.more-btn:hover,.messenger-btn:hover,.all-concerts-button:hover{
  background:var(--gold-hover);box-shadow:0 8px 20px rgba(0,0,0,0.7);color:#000
}
.gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:40px 0}
.card{background:rgba(255,255,255,0.05);border:1px solid rgba(255,255,255,0.2);border-radius:8px;overflow:hidden;transition:transform .3s;opacity:0}
.card.visible{opacity:1}
.card:hover{transform:scale(1.03)}
.card img{width:100%;height:auto;display:block;loading:lazy}
.card p{color:#ccc;font-size:0.9rem;margin:8px 0 0;text-align:center}
.lightbox{display:none;position:fixed;inset:0;background:rgba(0,0,0,0.95);justify-content:center;align-items:center;z-index:1000}
.lightbox.is-open{display:flex}
.lightbox img{max-width:90%;max-height:90%;border-radius:8px}
.lightbox button{position:absolute;top:50%;background:none;border:none;color:white;font-size:3rem;cursor:pointer;transform:translateY(-50%);opacity:0.7;transition:opacity .2s}
.lightbox button:hover{opacity:1}
.lightbox .prev{left:20px}.lightbox .next{right:20px}
footer{text-align:center;padding:30px;color:#aaa;font-size:0.9rem;border-top:1px solid rgba(255,255,255,0.2)}
.filter-container{margin:30px 0;text-align:right}
select,input{background:rgba(0,0,0,0.6);color:#fff;border:1px solid rgba(255,255,255,0.3);padding:6px 10px;border-radius:6px;transition:transform .2s}
select:hover,input:hover{transform:scale(1.05)}
.contact-box{background:rgba(0,0,0,0.4);padding:40px;border-radius:12px;box-shadow:0 4px 20px rgba(0,0,0,0.6);text-align:center}
.contact-text,.messenger-text{font-size:1.2rem;line-height:1.7;margin:30px 0}
.contact-item{margin:30px 0}
.contact-item strong{color:var(--gold);font-size:1.1rem;display:block;margin-bottom:8px}
.contact-item a{font-size:1.6rem;font-weight:700}
/* Plovoucí tlačítko Nahoru */
.back-to-top{
  position:fixed;bottom:30px;right:30px;background:var(--gold);color:#000;width:56px;height:56px;
  border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:2rem;font-weight:bold;
  box-shadow:0 6px 20px rgba(0,0,0,0.7);opacity:0;visibility:hidden;transition:all .4s;z-index:99
}
.back-to-top.visible{opacity:1;visibility:visible}
.back-to-top:hover{background:var(--gold-hover);transform:scale(1.1)}