header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 24px;
  max-width: 1200px;
  margin: 0 auto;
}

#header-nav {
  display: flex;
  justify-content: space-between;
  text-transform: uppercase;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--text-color);
}

.logo img {
  height: 80px;
  margin-right: 12px;
}

.logo span {
  font-weight: 700;
  font-size: 1.5rem;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
  margin: 0;
  padding: 0;
}

nav a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition);
}

nav a:hover::after {
  width: 100%;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }

  #header-nav {
    position: fixed;
    top: 0;
    left: 280px;
    right: 0;
    width: 140px;
    background: rgba(255, 255, 255, 0.98);
    padding: 1rem;
    transform: translateY(-150%);
    transition: var(--transition);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 999;
  }

  #header-nav.active {
    transform: translateY(0);
  }

  #header-nav ul {
    flex-direction: column;
    gap: 1rem;
  }

  #header-nav a {
    display: block;
    padding: 0.5rem 0;
  }
}