#navbar {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 1.5rem 0;
  background-color: transparent;
  backdrop-filter: blur(0px);
  z-index: 100;
  transition: all 0.3s ease;
}

#navbar.scrolled {
  padding: 0.8rem 0;
  background-color: rgba(15,17,26,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  box-shadow: 0 2px 0 rgba(255,255,255,0.07);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#navbar .logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(90deg, var(--color-primary) 20%, var(--color-accent) 50%, var(--color-primary) 80%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-size: 200% 100%;
  animation: shine 2s linear infinite;
}

@keyframes shine {
  0% { background-position: -100% 0; }
  100% { background-position: 100% 0; }
}

#navbar.scrolled .logo {
  font-size: 1.2rem;
}

#navbar nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
  margin: 0;
  padding: 0;
  align-items: center;
}

#navbar nav ul li a,
#navbar nav ul li button { 
  font-family: var(--font-text);
  font-size: 1rem;
  color: var(--color-primary);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
}

#navbar nav ul li a:hover,
#navbar nav ul li button:hover {
  color: var(--color-accent);
}

#navbar nav ul li a {
  position: relative;
  display: inline-block;
}

#navbar nav ul li a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px; 
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width 0.3s ease;
}

#navbar nav ul li a:hover::after {
  width: 100%;
}


/* MOBILE NAVIGATION------------------------------------------------
------------------------------------------------------------------------------ */
.nav-toggle {
  display: none;
  width: 30px;
  height: 22px; 
  background: none;
  border: none;
  cursor: pointer;
  z-index: 3001; 
  position: relative;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 3px;
  background: white;
  border-radius: 2px;
  transition: all 0.3s ease;
  position: absolute; /* Důležité: čáry budeme pozicovat absolutně v rámci tlačítka */
}

/* Výchozí pozice čar v hamburgeru */
.nav-toggle span:nth-child(1) { top: 0; }
.nav-toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav-toggle span:nth-child(3) { bottom: 0; }

/* Stav aktivního křížku */
.nav-toggle.active span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: translateX(-20px);
}

.nav-toggle.active span:nth-child(3) {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}


body.menu-open {
  overflow: hidden;
}