:root{
  --bg:#0b1220;
  --surface:#0f172a;
  --card:rgba(255,255,255,.06);
  --card2:rgba(255,255,255,.08);
  --text:#e5e7eb;
  --muted:#a7b0c0;
  --brand:#60a5fa;
  --brand2:#22d3ee;
  --ring:rgba(96,165,250,.45);
  --shadow:0 18px 50px rgba(0,0,0,.35);
  --radius:18px;
  --max:1100px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color:var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(34,211,238,.25), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(96,165,250,.22), transparent 55%),
    linear-gradient(180deg, #050816 0%, #0b1220 45%, #070a12 100%);
  line-height:1.6;
}

a{color:inherit}
img{max-width:100%; display:block}

.container{
  width:min(100%, var(--max));
  margin-inline:auto;
  padding-inline:20px;
}

/* Header */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  backdrop-filter:saturate(160%) blur(10px);
  background:rgba(5, 8, 22, .72);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding:14px 0;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  min-width: 180px;
}
.brand-logo{
  width:42px;
  height:42px;
  border-radius:12px;
  background:rgba(255,255,255,.06);
  padding:6px;
  box-shadow: 0 10px 30px rgba(0,0,0,.35);
}
.brand-name{
  font-weight:800;
  letter-spacing:.2px;
}
.site-nav{
  display:flex;
  flex-wrap:wrap;
  justify-content:flex-end;
  gap:10px;
}
.site-nav a{
  text-decoration:none;
  padding:10px 12px;
  border-radius:12px;
  color:var(--text);
  border:1px solid transparent;
  transition: transform .15s ease, background .15s ease, border-color .15s ease;
}
.site-nav a:hover{
  background:rgba(255,255,255,.06);
  border-color:rgba(255,255,255,.10);
  transform: translateY(-1px);
}

/* Sections */
section{
  padding:56px 0;
}
.content-section{
  width:min(100%, var(--max));
  margin:0 auto;
}

h1,h2,h3{
  line-height:1.2;
  margin:0 0 12px 0;
}
h2{
  font-size: clamp(24px, 2.2vw, 34px);
  letter-spacing:.2px;
}
p{margin:0 0 12px 0; color:rgba(229,231,235,.92)}
ul{margin:10px 0 0 18px; color:rgba(229,231,235,.92)}
li{margin:6px 0}

/* Hero */
#about{
  padding:68px 0;
  background-image:
    linear-gradient(180deg, rgba(5,8,22,.35) 0%, rgba(5,8,22,.88) 62%, rgba(11,18,32,1) 100%),
    url("back.png");
  background-size: cover;
  background-position:center;
}
.hero-card{
  background: linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.05));
  border:1px solid rgba(255,255,255,.10);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.35fr .65fr;
  gap:26px;
  align-items:center;
}
.hero-card .lead{
  font-size: 18px;
  color: rgba(229,231,235,.95);
}
.hero-logo{
  width:min(260px, 70%);
  margin-inline:auto;
  opacity:.98;
  filter: drop-shadow(0 16px 38px rgba(0,0,0,.45));
}

/* Gallery */
#gallery{padding-top: 18px}
.gallery{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:16px;
}
.gallery img{
  width: 100%;
  height: 320px;          /* vyšší, aby bylo víc vidět */
  object-fit: contain;    /* zobrazí celý obrázek bez ořezu */
  background: rgba(255,255,255,.06); /* pruhy kolem obrázku vypadají záměrně */
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.10);
  box-shadow: 0 12px 30px rgba(0,0,0,.35);
}
@media (max-width: 820px){
  .gallery{ grid-template-columns: 1fr; }
  .gallery img{ height: 260px; }
}

.gallery img{
  border-radius: 16px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.05);
  box-shadow: 0 10px 30px rgba(0,0,0,.28);
  overflow:hidden;
  transition: transform .18s ease, box-shadow .18s ease;
}
.gallery img:hover{
  transform: translateY(-4px);
  box-shadow: 0 18px 45px rgba(0,0,0,.45);
}

/* Article archive tiles */
#articles{
  background: linear-gradient(180deg, rgba(96,165,250,.12), rgba(5,8,22,0));
}
.article-grid{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap:14px;
  margin-top:18px;
}
.article-tile{
  background: linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.05));
  border:1px solid rgba(255,255,255,.10);
  color: var(--text);
  text-decoration:none;
  text-align:left;
  padding:14px 14px;
  border-radius: 16px;
  box-shadow: 0 12px 35px rgba(0,0,0,.28);
  transition: transform .15s ease, border-color .15s ease, background .15s ease;
}
.article-tile:hover{
  transform: translateY(-3px);
  border-color: rgba(96,165,250,.35);
  background: linear-gradient(180deg, rgba(96,165,250,.14), rgba(255,255,255,.05));
}

/* Contact */
#contact .contact-grid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:16px;
}
.card{
  background: linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.05));
  border:1px solid rgba(255,255,255,.10);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 12px 35px rgba(0,0,0,.28);
}
.card small, .muted{color: var(--muted)}
iframe{
  width:100%;
  height: 330px;
  border:0;
  border-radius: 16px;
  overflow:hidden;
}

/* Partners */
#partners{
  position: relative;
  padding: 64px 0;
  background: linear-gradient(180deg, rgba(34,211,238,.10), rgba(5,8,22,0));
}
#partners::before{
  content:"";
  position:absolute;
  inset: 18px 0 18px 0;
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border: 1px solid rgba(255,255,255,.10);
  box-shadow: 0 18px 60px rgba(0,0,0,.45);
  pointer-events:none;
}
#partners .container{ position: relative; }

.partners-logos{
  display:grid;
  grid-template-columns: repeat(6, 1fr);
  gap:14px;
  align-items:center;
  margin-top: 18px;
}

/* Modern partners grid + unified logo plates */
.partners-grid{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 18px;
  margin-top: 22px;
  align-items: stretch;
}
.partner-card{
  border-radius: 18px;
  padding: 14px;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.10);
  box-shadow: 0 10px 28px rgba(0,0,0,.35);
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}
.partner-card:hover{
  transform: translateY(-2px);
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.18);
}
.partner-card .logo-plate{
  height: 86px;
  border-radius: 14px;
  background: rgba(255,255,255,.92);
  display:flex;
  align-items:center;
  justify-content:center;
  padding: 10px 14px;
  overflow:hidden;
  box-shadow: inset 0 1px 0 rgba(0,0,0,.10);
}
.partner-card img{
  max-height: 64px;
  max-width: 100%;
  object-fit: contain;
  filter: saturate(.9) contrast(1.05);
  opacity: .95;
  transition: filter .18s ease, opacity .18s ease;
}
.partner-card:hover img{
  filter: saturate(1.05) contrast(1.08);
  opacity: 1;
}
.partners-logos img{
  width:100%;
  max-height: 64px;
  object-fit: contain;
  padding: 10px;
  border-radius: 16px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.10);
  transition: transform .15s ease, border-color .15s ease, background .15s ease;
}
.partners-logos img:hover{
  transform: translateY(-2px);
  border-color: rgba(34,211,238,.35);
  background: rgba(255,255,255,.08);
}

/* Footer */
footer{
  padding: 28px 0;
  border-top:1px solid rgba(255,255,255,.08);
  background: rgba(5,8,22,.75);
}

/* Article pages (text + thumbnails + modal) */
.thumbnail{
  cursor: zoom-in;
}
.thumbs{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 18px;
}
.thumbs img{
  border-radius:16px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.05);
  box-shadow: 0 10px 28px rgba(0,0,0,.28);
  transition: transform .15s ease;
}
.thumbs img:hover{transform: translateY(-3px)}

/* Modal */
.modal{
  display:none;
  position:fixed;
  z-index:200;
  left:0; top:0;
  width:100%; height:100%;
  background: rgba(0,0,0,.72);
  padding: 24px;
}
.modal-content{
  position:relative;
  margin:auto;
  max-width: min(1100px, 96vw);
  max-height: 84vh;
  display:flex;
  align-items:center;
  justify-content:center;
}
.modal-content img{
  max-width:100%;
  max-height:84vh;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,.14);
  box-shadow: 0 22px 70px rgba(0,0,0,.55);
}
.close{
  position:fixed;
  top:18px;
  right:20px;
  font-size: 36px;
  color: white;
  cursor:pointer;
  user-select:none;
}
.modal-controls{
  position:fixed;
  left:0; right:0;
  top:50%;
  transform: translateY(-50%);
  display:flex;
  justify-content:space-between;
  padding: 0 16px;
  pointer-events:none;
}
.prev,.next{
  pointer-events:auto;
  cursor:pointer;
  user-select:none;
  padding: 10px 14px;
  border-radius: 14px;
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.16);
  backdrop-filter: blur(8px);
  font-size: 18px;
}

/* Responsive */
@media (max-width: 980px){
  .article-grid{grid-template-columns: repeat(2, 1fr)}
  .partners-logos{grid-template-columns: repeat(3, 1fr)}
  .hero-grid{grid-template-columns: 1fr}
  .brand{min-width:unset}
}
@media (max-width: 640px){
  section{padding:42px 0}
  .gallery{grid-template-columns:1fr}
  .article-grid{grid-template-columns:1fr}
  #contact .contact-grid{grid-template-columns:1fr}
  .partners-logos{grid-template-columns: repeat(2, 1fr)}
  .site-nav a{padding:8px 10px}
  .thumbs{grid-template-columns: repeat(2, 1fr)}
}