.nav { padding-inline: 15px; }

.header {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--bg-1);
    padding-block: 15px;
    z-index: 4;
}

.header.active {
    position: fixed;
    top: -66px;
    background-color: var(--branco);
    border-block-start: 1px solid var(--bordabranca);
    box-shadow: var(--sombra-1);
    animation: slideIn 0.25s var(--cubic-out) forwards;
}

@keyframes slideIn {

    0% {
      transform: translateY(0);
      background-color: var(--branco);
    }
  
    100% {
      transform: translateY(100%);
      background-color: var(--bg-2);
    }
  
}

.header > .nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

.logo {
    color: var(--branco);
    font-size: 2.5rem;
    font-weight: var(--fontw-700);
    display: flex;
    align-items: center;
    gap: 5px;
    font-family: var(--font-sans);
}
  
.nav-altera-btn .line {
    width: 26px;
    height: 3px;
    background-color: var(--branco);
    transition: var(--transition-1);
}

.nav-altera-btn .line:not(:last-child) {margin-block-end: 4px;}

.nav-altera-btn {
    padding: 8px 5px;
    margin-inline-start: auto;
}

.nav-altera-btn.active .line-1 { transform: rotate(45deg) translate(5px, 6px);}

.nav-altera-btn.active .line-2 { opacity: 0; }

.nav-altera-btn.active .line-3 { transform: rotate(-45deg) translate(4px, -5px);}

.navbar { 
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--bg-1);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: 0.25s var(--cubic-out);
}

.navbar.active {
  max-height: calc(100vh - 63px);
  visibility: visible;
  transition-duration: 0.5s;
}

.navbar-item:not(:last-child) { border-block-end: 1px solid var(--branco_30);}

.navbar-link {
  color: var(--branco);
  font-weight: var(--fontw-700);
  font-family: var(--font-sans);
  padding: 12px 30px;
  transition: var(--transition-1);
}

.navbar-link:is(:hover, :focus, .active) { color: var(--azul); }