*, *::before, *::after { box-sizing: border-box; }
  html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
  body { 
      margin: 0; 
      font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; 
      line-height: 1.5;       
  }

  body::before {
    content: "";
    position: fixed;
    inset: 0;

    background-image: url("../../images/background.png");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;

    /* LEHKÉ ROZMÁZNUTÍ */
    filter: blur(3px);

    /* ZTMAVENÍ DO MODRA */
    background-color: rgba(19, 0, 88, 0.9);
    background-blend-mode: multiply;

    z-index: -1;
  }

  a { 
    color: inherit; 
    text-decoration: none; 
  }
  a:focus-visible, summary:focus-visible, button:focus-visible { 
    outline: 2px solid currentColor; 
    outline-offset: 2px; 
  }

  /* ===== HEADER ===== */
  header { 
    border-bottom: 1px solid var(--orange-line);       
    background: var(--blue-menu);
 }
  .topbar {
    width: min(1200px, 100% - 2rem);
    margin-inline: auto;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    min-height: 64px;   
  }
  .logo{
  width: 80px;              /* velikost kroužku */
  height: 80px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;          /* ořízne obrázek do kruhu */
  border: 1px solid var(--orange-line); /* jemný okraj (volitelně) */
  margin: 10px;
}

.logo img{
  width: 90%;                /* velikost obrázku uvnitř */
  height: 90%;
  object-fit: contain;
  display: block;
}

  /* ===== TOGGLE PRO MOBIL ===== */
  .menu-toggle {
    margin-left: auto;
    display: none;
    padding: .45rem .65rem;
    border: 1px solid #e5e5e5;
    border-radius: .7rem;
    cursor: pointer;
    
  }

  /* ===== NAV ===== */
  nav.nav { display: flex; align-items: center; }
  .nav ul { list-style: none; margin: 0; padding: 0; }
  .nav > ul { display: flex; gap: .25rem; align-items: center; }

  .nav li { position: relative; }

  .nav a, .nav button {
    display: block;
    padding: .5rem .7rem;
    border: none;
    background: none;
    font: inherit;
    cursor: pointer;
    white-space: nowrap; 
    color: #fff;
  }
  .nav a:hover, .nav button:hover { 
    background: var(--blue-menu); 
  }

  /* ===== SUBMENU ===== */
  .sub {
    position: absolute;
    top: 100%;
    min-width: 220px;

    background: var(--blue-menu);
    padding: .35rem;
    border-left: 5px solid var(--orange-line);   

    opacity: 0;
    pointer-events: none;
    transform: translateY(6px);
    transition: opacity .12s ease, transform .12s ease;
    z-index: 50;
  }

  /* 3. úroveň do strany */
  .sub .sub {
    left: 100%;
    top: 0;
    transform: translateX(6px);
  }

  /* ŠIPKY */
  .has > button::after { content: "▾"; margin-left: .35rem; opacity: .7; }
  .sub .has > button::after { content: "▸"; }

  /* ===== DESKTOP: AUTO SCHOVÁNÍ PO ODJETÍ MYŠI =====
     submenu je vidět jen když je rodič hover nebo focus-within
     jakmile myš odjede pryč z LI, :hover přestane platit => schová se */
  @media (min-width: 900px) {
    .nav li:hover > .sub,
    .nav li:focus-within > .sub {
      opacity: 1;
      pointer-events: auto;
      transform: translateY(0);
    
    }

    /* u 3. úrovně použij boční transform */
    .nav .sub li:hover > .sub,
    .nav .sub li:focus-within > .sub {
      transform: translateX(0);
    }
  }

  /* ===== MOBIL: PANEL + klikání ===== */
  @media (max-width: 899.98px) {
    .menu-toggle { display: inline-flex; }

    nav.nav {
      position: fixed;
      inset: 0 20% 0 0;
      max-width: 420px;
      background: #fff;
      border-right: 1px solid #e5e5e5;
      padding: 1rem;

      align-items: flex-start;
      transform: translateX(-110%);
      transition: transform .2s ease;
      z-index: 60;
    }
    nav.nav.is-open { transform: translateX(0); }

    .nav > ul { flex-direction: column; align-items: stretch; width: 100%; }

    /* submenu v mobilu je normálně skryté a rozbalí se klikem */
    .sub {
      position: static;
      border: none;
      padding: 0;
      margin-left: 1rem;

      opacity: 1;
      pointer-events: auto;
      transform: none;
      display: none;       /* <-- skryté */

    }
    .sub.open { display: block;}

    .backdrop {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,.3);
      opacity: 0;
      pointer-events: none;
      transition: opacity .2s ease;
      z-index: 55;
    }
    .backdrop.is-open { opacity: 1; pointer-events: auto; }
  }