/* 4BC — shared stylesheet */
:root{
  --ink:#0b0d12;
  --black:#111318;
  --charcoal:#232630;
  --grey:#5a5d68;
  --muted:#6d707a;
  --line:#dfe1e6;
  --soft:#f2f3f6;
  --blue:#2b57ff;
  --blue-dark:#1a3fd6;
  --white:#fff;
  --gutter:clamp(20px,5vw,64px);
  --maxw:1360px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif;color:var(--ink);background:var(--white);line-height:1.5;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.wrap{padding-inline:var(--gutter);max-width:var(--maxw);margin-inline:auto}
main{display:block}
section{scroll-margin-top:96px}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:76px}
.logo{font-weight:800;font-size:1.7rem;letter-spacing:-.02em;color:var(--ink)}
.logo b{color:var(--blue)}
.nav{display:flex;align-items:center;gap:clamp(18px,3vw,40px);font-weight:500;font-size:.98rem}
.nav a{padding:6px 0;border-bottom:2px solid transparent;transition:color .15s,border-color .15s;white-space:nowrap}
.nav a:hover,.nav a[aria-current="page"]{color:var(--blue);border-color:var(--blue)}
.nav-toggle{display:none;background:none;border:0;font:inherit;font-weight:700;cursor:pointer;padding:8px;font-size:1.4rem;line-height:1}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:.7em;background:var(--blue);color:#fff;font-weight:700;text-transform:uppercase;letter-spacing:.02em;font-size:.9rem;padding:1.05em 1.5em;border:0;cursor:pointer;transition:background .15s,transform .15s}
.btn:hover{background:var(--blue-dark)}
.btn:hover .arr{transform:translateX(4px)}
.arr{transition:transform .15s;display:inline-block}
.btn-outline{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.btn-outline:hover{background:var(--ink);color:#fff}

/* ---------- page hero (subpages) ---------- */
.page-top{padding-block:clamp(28px,4vw,48px) 8px}
.eyebrow{display:block;color:var(--blue);font-weight:700;text-transform:uppercase;letter-spacing:.1em;font-size:.82rem;margin-bottom:14px}
.page-top h1{font-size:clamp(2.6rem,6vw,4.6rem);font-weight:800;letter-spacing:-.04em;line-height:1.02}

/* ---------- home hero ---------- */
.hero{padding-top:clamp(24px,5vw,56px)}
.hero h1{font-size:clamp(3rem,9.5vw,8.2rem);line-height:.97;letter-spacing:-.045em;font-weight:800}
.hero h1 span{color:var(--blue);display:block}
.hero-row{display:flex;justify-content:space-between;align-items:flex-end;gap:32px;margin-top:clamp(18px,3vw,32px);flex-wrap:wrap}
.hero-row p{max-width:30ch;font-size:clamp(1.1rem,1.8vw,1.45rem);color:var(--muted);line-height:1.4}
.tiles-wrap{margin-top:32px;border-top:1px solid var(--grey)}
.tiles{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin-top:16px}
.tile{aspect-ratio:1/1;padding:18px;display:flex;flex-direction:column;justify-content:flex-end;color:#fff;transition:transform .2s;overflow:hidden;position:relative}
.tile:hover{transform:translateY(-4px)}
.tile small{font-size:.85rem;font-weight:400;opacity:.7;letter-spacing:.03em}
.tile strong{font-size:clamp(1.1rem,2.3vw,1.9rem);font-weight:600;letter-spacing:.01em;text-transform:uppercase}
.t1{background:var(--black)}.t2{background:var(--charcoal)}.t4{background:var(--grey)}.t5{background:var(--blue)}
.t3{padding:0}
.t3 img{width:100%;height:100%;object-fit:cover;filter:grayscale(1) contrast(1.05)}

/* ---------- services teaser (home) ---------- */
.section-title{font-size:clamp(2rem,4.6vw,3.4rem);font-weight:800;letter-spacing:-.03em;padding:clamp(56px,8vw,100px) 0 clamp(24px,4vw,40px)}
.section-title.center{text-align:center}
.svc-rows{display:grid;gap:14px}
.svc-row{display:grid;grid-template-columns:200px 1fr;gap:14px;min-height:150px}
.svc-row .photo{overflow:hidden}
.svc-row .photo img{width:100%;height:100%;object-fit:cover;filter:grayscale(1)}
.svc-row .card{padding:26px 30px;display:flex;flex-direction:column;justify-content:center;gap:10px;color:#fff;position:relative}
.svc-row .card h3{font-size:clamp(1.3rem,2.4vw,1.9rem);font-weight:700;letter-spacing:-.01em;padding-right:40px}
.svc-row .card ul{font-size:.98rem;font-weight:300;opacity:.78;line-height:1.6}
.svc-row .card .go{position:absolute;right:24px;top:26px;font-size:1.5rem}
.svc-row .card:hover .go{transform:translateX(4px)}
.svc-row .card .go{transition:transform .15s}
.r1 .card{background:var(--black)}
.r2 .card{background:var(--blue)}
.r3 .card{background:var(--charcoal)}
.svc-intro{background:var(--soft);padding:clamp(26px,4vw,44px);display:flex;flex-direction:column;gap:16px;justify-content:center}
.svc-intro h3{font-size:clamp(1.4rem,2.6vw,2rem);line-height:1.2;font-weight:700;letter-spacing:-.02em}
.svc-intro p{font-size:1.02rem;line-height:1.6;color:var(--ink)}
.svc-layout{display:grid;grid-template-columns:2fr 1fr;gap:14px;align-items:stretch}

/* ---------- mosaic / clients (home) ---------- */
.clients{display:grid;grid-template-columns:1fr 1.9fr;gap:clamp(20px,3vw,44px);padding-block:clamp(56px,8vw,100px);align-items:start}
.mosaic{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.mosaic > div{overflow:hidden;min-height:110px}
.mosaic img{width:100%;height:100%;object-fit:cover;filter:grayscale(1)}
.m-black{background:var(--black)}.m-char{background:var(--charcoal)}.m-soft{background:var(--soft);border:1px solid var(--line)}.m-blue{background:var(--blue)}
.mosaic .tall{grid-row:span 2}
.clients-right h2{font-size:1rem;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:22px;border-top:1px solid var(--line);padding-top:22px}
.logos{--cols:4;display:flex;flex-wrap:wrap;justify-content:center;row-gap:8px}
.logo-box{flex:0 0 calc(100% / var(--cols));aspect-ratio:1.9/1;display:grid;place-items:center;container-type:inline-size}
/* --k = 1/sqrt(aspect ratio): gives every logo the same visual area */
.logo-box img{height:calc(var(--k,.6) * 36cqw);width:auto;max-width:86%;object-fit:contain;opacity:.85;transition:opacity .2s}
.logo-box:hover img{opacity:1}

/* ---------- diagnostika / accordion page ---------- */
.split-hero{background:var(--soft);padding-block:clamp(36px,6vw,80px)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,5vw,64px);align-items:start}
.split h1{font-size:clamp(2.8rem,7vw,5.4rem);font-weight:800;letter-spacing:-.04em;line-height:1;margin-bottom:clamp(20px,3vw,36px)}
.lead p{font-size:clamp(1.02rem,1.4vw,1.2rem);line-height:1.5;margin-bottom:1.1em;max-width:40ch}
.lead .btn{margin-top:16px}
.acc-layout{display:grid;grid-template-columns:1fr clamp(100px,14vw,180px);gap:14px;align-items:start}
.acc{display:grid;gap:8px}
.acc-item{background:#e2e3e8;border:1px solid #cfd1d7;transition:background .2s}
.acc-item.open{background:#fff;border:1px solid var(--ink)}
.acc-btn{width:100%;display:flex;justify-content:space-between;align-items:flex-start;gap:16px;padding:16px 20px;background:none;border:0;font:inherit;text-align:left;cursor:pointer;color:inherit}
.acc-btn .state{display:block;font-size:.76rem;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.acc-item.open .state{color:var(--blue)}
.acc-btn .name{display:block;font-size:1.1rem;font-weight:700;margin-top:2px}
.acc-item.open .name{font-size:1.4rem;margin-top:14px}
.acc-btn .icon{font-size:1.4rem;line-height:1;font-weight:300;margin-top:2px}
.acc-panel{display:grid;grid-template-rows:0fr;transition:grid-template-rows .3s ease}
.acc-item.open .acc-panel{grid-template-rows:1fr}
.acc-panel>div{overflow:hidden}
.acc-panel p{padding:0 20px 20px;font-size:.98rem;line-height:1.55}
.acc-panel p+p{padding-top:0}
.acc-panel ul{padding:0 20px 20px 40px;list-style:disc;font-size:.98rem;line-height:1.55}
.acc-panel li+li{margin-top:4px}
.acc-btn:focus-visible{outline:2px solid var(--blue);outline-offset:-2px}
.side-imgs .charcoal{background:var(--charcoal);aspect-ratio:1/.7}

/* section variants for the accordion layout */
.split-hero.is-white{background:#fff;border-top:1px solid var(--line)}
.split-hero.is-dark{background:var(--ink);color:#fff}
.split-hero.is-dark .lead p{color:#b8bbc2}
.split-hero.is-dark .acc-item{background:#1b1d24;border-color:#2e313b}
.split-hero.is-dark .acc-item.open{background:var(--charcoal);border-color:#fff}
.split-hero.is-dark .acc-btn .state{color:#8a8d96}
.split-hero.is-dark .acc-item.open .state{color:#7d9bff}
.split .h2-like{font-size:clamp(2.4rem,5.5vw,4.4rem);font-weight:800;letter-spacing:-.04em;line-height:1.02;margin-bottom:clamp(20px,3vw,36px)}
.side-imgs{display:grid;gap:12px}
.side-imgs img{width:100%;object-fit:cover;filter:grayscale(1)}
.side-imgs .blue{background:var(--blue);aspect-ratio:1/.7}

/* ---------- generic content page (skoleni) ---------- */
.content-hero{padding-block:clamp(32px,5vw,64px)}
.content-hero p.lead-p{max-width:60ch;font-size:clamp(1.05rem,1.6vw,1.3rem);color:var(--muted);margin-top:16px;line-height:1.5}
.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding-block:clamp(24px,4vw,48px) clamp(56px,7vw,90px)}
.card3{border:1px solid var(--line);padding:28px}
.card3 .tag{display:inline-block;background:var(--soft);color:var(--muted);font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;padding:5px 10px;margin-bottom:16px}
.card3 h3{font-size:1.3rem;font-weight:700;letter-spacing:-.01em;margin-bottom:10px}
.card3 p{color:var(--grey);font-size:.98rem;line-height:1.5;margin-bottom:18px}
.card3 a{font-weight:700;color:var(--blue);font-size:.92rem}
.notice{background:var(--soft);border-left:3px solid var(--blue);padding:20px 24px;margin-block:8px 48px;font-size:.95rem;color:var(--grey);max-width:70ch}

/* ---------- contact page ---------- */
.contact-page{padding-block:clamp(32px,5vw,64px) clamp(56px,8vw,100px)}
.contact-grid2{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,64px);margin-top:clamp(28px,4vw,48px)}
.contact-info{display:grid;gap:26px;align-content:start}
.contact-info h3{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:6px}
.contact-info p,.contact-info a{font-size:1.15rem;font-weight:600}
.contact-info a:hover{color:var(--blue)}
.form{display:grid;gap:14px;background:var(--soft);padding:clamp(24px,3vw,36px)}
.form label{font-size:.85rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--grey);display:block;margin-bottom:6px}
.form input,.form textarea{width:100%;border:1px solid var(--line);background:#fff;padding:13px 14px;font:inherit;font-size:.98rem;color:var(--ink)}
.form input:focus,.form textarea:focus{outline:2px solid var(--blue);outline-offset:1px}
.form textarea{resize:vertical;min-height:120px}
.form .btn{justify-self:start;margin-top:6px}
.map-embed{margin-top:clamp(28px,4vw,48px)}
.map-embed iframe{width:100%;display:block;border:1px solid var(--line);filter:grayscale(1) contrast(1.05)}
.map-embed a{display:inline-block;margin-top:10px;font-weight:700;color:var(--blue);font-size:.92rem}
.form .hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-note{font-size:.82rem;color:var(--muted);line-height:1.5}
.form-status{font-weight:600;font-size:.98rem}
.form-status.ok{color:#137a3a}
.form-status.err{color:#b42318}
.form .btn[disabled]{opacity:.6;cursor:wait}

/* ---------- public trainings ---------- */
.courses{display:grid;gap:clamp(20px,3vw,32px);padding-block:clamp(8px,2vw,16px) clamp(56px,7vw,90px)}
.course{border:1px solid var(--line);display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr)}
.course-main{padding:clamp(24px,4vw,48px);display:flex;flex-direction:column;gap:16px}
.course-main .tag{align-self:flex-start;background:var(--blue);color:#fff;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;padding:6px 12px}
.course-main h2{font-size:clamp(2rem,4.4vw,3.2rem);font-weight:800;letter-spacing:-.03em;line-height:1.05}
.course-main p{font-size:1.02rem;line-height:1.6;color:var(--grey)}
.course-main .btn{align-self:flex-start;margin-top:8px}
.course-main .small{font-size:.9rem;color:var(--muted)}
.course-side{background:var(--soft);padding:clamp(24px,4vw,48px);display:grid;gap:26px;align-content:start}
.course-side h3{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:10px}
.course-side ul{display:grid;gap:8px}
.course-side li{padding-left:20px;position:relative;line-height:1.45}
.course-side li::before{content:"→";position:absolute;left:0;color:var(--blue)}
.course-side details{border-top:1px solid var(--line);padding-top:14px}
.course-side details+details{margin-top:-12px}
.course-side summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:12px}
.course-side summary::-webkit-details-marker{display:none}
.course-side summary::after{content:"+";font-weight:300;font-size:1.3rem;line-height:1}
.course-side details[open] summary::after{content:"−"}
.course-side details p{margin-top:10px;font-size:.95rem;line-height:1.55;color:var(--grey)}

/* ---------- 404 ---------- */
.notfound{padding-block:clamp(64px,12vw,160px)}
.notfound p{margin:18px 0 28px;color:var(--muted);font-size:1.15rem}

/* ---------- contact section (all pages, footer-adjacent) ---------- */
.contact-band{background:var(--ink);color:#fff;padding-block:clamp(52px,8vw,100px)}
.contact-band-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:clamp(24px,5vw,80px);align-items:start}
.contact-band h2{font-size:clamp(2rem,4.6vw,3.4rem);font-weight:800;letter-spacing:-.03em;line-height:1.05}
.contact-band h2 span{color:var(--blue)}
.contact-band-grid p{margin-top:14px;color:#b7bac2;max-width:46ch}
.contact-list{display:grid;gap:16px;font-size:1.1rem}
.contact-list small{display:block;color:#8a8d96;font-size:.76rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:2px}
.contact-list a:hover{color:var(--blue)}
.contact-band .btn{margin-top:26px}

.site-footer{padding:26px 0;color:var(--muted);font-size:.88rem}
.site-footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
.site-footer.on-dark{background:var(--ink);color:#7c7f89}
.site-footer.on-dark .wrap{border-top:1px solid #2a2c34;padding-top:22px}
.foot-left{display:flex;align-items:center;flex-wrap:wrap;gap:10px 16px}
.foot-sep{width:1px;height:1.1em;background:currentColor;opacity:.45}
.site-footer a{color:inherit}

/* ---------- responsive ---------- */
@media (max-width:980px){
  /* compact header with ☰ menu */
  .site-header .wrap{height:64px}
  .nav-toggle{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:64px;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:0;padding:8px var(--gutter) 16px;font-size:1.05rem}
  .nav.open{display:flex}
  .nav a{padding:14px 0;border-bottom:1px solid var(--line)}
  section{scroll-margin-top:80px}

  /* hero: stacked, then a symmetric 2×2 of tiles with the photo as a full-width strip in the middle */
  .hero-row{flex-direction:column;align-items:flex-start;gap:22px}
  .hero-row p{max-width:34ch}
  .tiles-wrap{margin-top:28px}
  .tiles{grid-template-columns:repeat(2,1fr);gap:10px}
  .tile{aspect-ratio:1.6/1;padding:16px 18px}
  .tile:hover{transform:none}
  .tile strong{font-size:clamp(1.1rem,3.6vw,1.6rem)}
  .t3{grid-column:1 / -1;aspect-ratio:2.4/1;padding:0}

  .svc-row{grid-template-columns:110px 1fr}
  .svc-layout{grid-template-columns:1fr}
  .clients{grid-template-columns:1fr}
  .mosaic{display:none}
  .logos{--cols:3}
  .split,.acc-layout,.contact-band-grid,.contact-grid2,.cards3,.course{grid-template-columns:1fr}
  .side-imgs{display:none}
}
@media (max-width:720px){
  .hero-row p{max-width:none}
  .hero-row .btn{width:100%;justify-content:center}
  .svc-row{grid-template-columns:84px 1fr;min-height:0}
  .svc-row .card{padding:20px 44px 20px 20px}
  .svc-row .card .go{right:16px;top:20px}
  .section-title{padding:56px 0 22px}
  .logos{--cols:2}
  .logo-box{aspect-ratio:2.3/1}
  .site-footer .wrap{flex-direction:column}
  .foot-left{flex-direction:column;align-items:flex-start;gap:10px}
  .foot-sep{display:none}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}