:root{
  --bg:#0a0b0d;
  --surface:#0f1115;
  --text:#f2f5f7;
  --muted:#b9c2cc;
  --accent:#22c55e;
  --accent-600:#16a34a;
  --card:#12151b;
  --border:#1f2430;
  --shadow: 0 10px 30px rgba(0,0,0,.4);
}

*{ box-sizing:border-box; }
html,body{ margin:0; padding:0; }

body{
  font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,'Helvetica Neue',Arial,'Noto Sans','Liberation Sans',sans-serif;
  color:var(--text);
  background:linear-gradient(180deg, var(--bg), #07080b 60%);
  line-height:1.6;
}

.container{ width:min(1100px, 92%); margin-inline:auto; }

/* Přístupnost */
.skip-link{
  position:absolute; left:-9999px; top:auto;
  width:1px; height:1px; overflow:hidden;
}
.skip-link:focus{
  left:1rem; top:1rem; width:auto; height:auto;
  background:var(--accent); color:#06230f;
  padding:.5rem 1rem; border-radius:.5rem;
}

/* HEADER */
.site-header{
  position:sticky; top:0;
  background:rgba(10,11,13,.72);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
  z-index:50;
}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding:1rem 0;
}

/* Brand vlevo: {#} Admin9 + Doučování. Vývoj */
.brand{
  display:flex;
  align-items:center;
  gap:.75rem;
  color:var(--text);
  text-decoration:none;
  font-weight:700;
  min-width: 260px; /* drží prostor vlevo, aby menu bylo hezky vycentrované */
}

.brand-mark{
  color:var(--accent);
  font-weight:800;
  font-size:1.1rem;
  padding:.35rem .5rem;
  border:1px solid rgba(34,197,94,.35);
  border-radius:.75rem;
  background:rgba(34,197,94,.08);
}

.brand-stack{ display:flex; flex-direction:column; line-height:1.1; }
.brand-title{ font-size:1.05rem; letter-spacing:.2px; }
.brand-subtitle{ font-size:.9rem; color:var(--muted); font-weight:600; }

/* Navigace vpravo nahoře: vycentrovaná + Kontakt ve stejné úrovni */
.site-nav{
  flex: 1; /* umožní centrování menu */
  display:flex;
  justify-content:center;
}

.site-nav ul{
  display:flex;
  align-items:center; /* stejné zarovnání jako tlačítko Kontakt */
  gap:.5rem;
  list-style:none;
  margin:0;
  padding:0;
}

.site-nav a{
  display:inline-flex;
  align-items:center;
  color:var(--text);
  text-decoration:none;
  padding:.55rem .8rem;
  border-radius:.6rem;
  font-weight:600;
  line-height:1;
}

.site-nav a:hover{ background:var(--border); }

/* Tlačítka */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:.65rem .95rem;
  border-radius:.75rem;
  text-decoration:none;
  font-weight:700;
  border:1px solid transparent;
  line-height:1;
}


.btn-primary{ background: var(--accent); color: #ffffff; }

.btn-primary:hover{ background: var(--accent-600);  color: #ffffff;}

.btn-outline{ border-color:var(--accent); color:var(--accent); }
.btn-outline:hover{ background:rgba(34,197,94,.1); }

.contact-card a.btn-primary{color: #ffffff;}


.btn-ghost{ color:var(--text); }
.btn-ghost:hover{ background:var(--border); }


.btn{
  transition: background-color .2s ease, color .2s ease;
}


.nav-contact{ margin-left:.35rem; } /* lehké oddělení Kontakt tlačítka */

/* Mobilní toggle */
.nav-toggle{
  display:none;
  background:transparent; border:0; cursor:pointer;
}
.nav-toggle .bar{
  display:block; width:24px; height:2px;
  background:var(--text); margin:5px 0;
}

/* HERO */
.hero{
  padding:5rem 0;
  background:radial-gradient(650px 320px at 80% 20%, rgba(34,197,94,.16), transparent 60%);
}
.hero-inner{
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:2rem;
  align-items:center;
}
.lead{ color:var(--muted); font-size:1.06rem; }
.highlight{ color:var(--accent); }
.cta{ display:flex; gap:.75rem; flex-wrap:wrap; margin:1.25rem 0; }
.bullets{ margin:.75rem 0 0 1.1rem; }

.code-card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:1rem;
  box-shadow:var(--shadow);
  padding:1rem;
}
.code-card pre{ margin:0; color:#c8f5dc; overflow:auto; }

/* SECTIONS */
.section{ padding:4rem 0; }
.section.alt{ background:linear-gradient(180deg, rgba(255,255,255,.02), transparent); }
.section h2{ font-size:2rem; margin:0 0 1rem; }

.about p{ margin:.4rem 0; }

.grid.cards{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:1.2rem;
}
.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:1rem;
  padding:1.25rem;
  box-shadow:var(--shadow);
}
.card h3{ margin-top:0; }

.grid.two{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:2rem;
  align-items:start;
}

.checklist{ padding-left:1.2rem; }
.checklist li{ margin:.25rem 0; }

.note,.muted{ color:var(--muted); }

/* CONTACT */
.contact{
  background:radial-gradient(650px 320px at 20% 55%, rgba(34,197,94,.12), transparent 60%);
}
.contact-card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:1rem;
  box-shadow:var(--shadow);
  padding:1.25rem;
}
.contact-card a{ color:var(--accent); text-decoration:none; }
.contact-card a:hover{ text-decoration:underline; }
.contact-lines{ margin:.6rem 0 0; }

/* FOOTER */
.site-footer{
  border-top:1px solid var(--border);
  padding:2rem 0;
  background:#07090c;
}
.footer-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  flex-wrap:wrap;
}
.site-footer a{ color:var(--muted); text-decoration:none; margin-right:1rem; }
.site-footer a:hover{ color:var(--text); }

/* RESPONSIVE */
@media (max-width: 980px){
  .hero-inner{ grid-template-columns:1fr; }
  .grid.cards{ grid-template-columns:1fr 1fr; }
  .grid.two{ grid-template-columns:1fr; }
}

@media (max-width: 820px){
  .nav-toggle{ display:block; }
  .site-nav{
    position:absolute;
    right:4%;
    top:68px;
    background:#0b0e12;
    border:1px solid var(--border);
    border-radius:.9rem;
    display:none;
    padding:.35rem;
    justify-content:flex-start;
    flex: 0;
  }
  .site-nav.open{ display:block; }
  .site-nav ul{
    flex-direction:column;
    align-items:stretch;
    min-width:240px;
  }
  .site-nav a{ justify-content:flex-start; }
  .brand{ min-width:auto; }
  .grid.cards{ grid-template-columns:1fr; }
}