.main-nav {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    text-align: center;
    background: #fff;
    opacity: 0;
    z-index: -1;
    visibility: hidden;
    transition: all 0.375s;
}

.main-nav.is-open {
    opacity: 1;
    z-index: 600;
    visibility: visible;

    display: inline;
}

.main-nav::before {
    content: "";
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: -15px;
    background: var(--cor-vermelho);
    transform-origin: 0 0;
    transform: skew(-14deg) translateX(-120%);
    transition: all 0.275s 0.1s;
}

.main-nav.is-open::before {
    transform: skew(-14deg) translateX(0);
}

.main-nav ul {
    display: inline-flex;
    flex-direction: column;
    height: 93%;
    align-items: flex-end;
    justify-content: center;
    transform: translateX(-18%) skew(-16deg);
}

.main-nav li {
    display: block;
    margin: 0.5rem 0;
    text-align: right;
    transform: skew(16deg);
}

.main-nav a {
    opacity: 0;
    transform: translateY(-10px);
}

.main-nav.is-open a {
    opacity: 1;
    transform: translateY(0);
}
.main-nav li:nth-child(1) a {
    transition: all 275ms 175ms;
}
.main-nav li:nth-child(2) a {
    transition: all 275ms 225ms;
}
.main-nav li:nth-child(3) a {
    transition: all 275ms 275ms;
}
.main-nav li:nth-child(4) a {
    transition: all 275ms 325ms;
}
.main-nav li:nth-child(5) a {
    transition: all 275ms 375ms;
}

.main-nav ul,
.main-nav li {
    list-style: none;
    padding: 0;
}
.main-nav a {
    display: block;
    padding: 12px 0;
    color: #fff;
    font-size: 1.2em;
    text-decoration: none;
    font-weight: bold;
}

.open-main-nav {
    position: absolute;
    top: 35px;
    padding-top: 20px;
    right: 35px;
    z-index: 1000;
    background: none;
    border: 0;
    cursor: pointer;
}
.open-main-nav:focus {
    outline: none;
}
.burger {
    position: relative;
    display: block;
    width: 28px;
    height: 4px;
    margin: 0 auto;
    background: #fff;
    transform: skew(5deg);
    transition: all 0.275s;
}

.burger:after,
.burger:before {
    content: "";
    display: block;
    height: 100%;
    background: #fff;
    transition: all 0.275s;
}

.header.fixed .burger{
    background: var(--cor-vermelho);
    top: 0;
}
.header.fixed .burger:after,
.header.fixed .burger:before {
    background: var(--cor-vermelho);
}

.header.fixed .burger-text {
    color: var(--cor-vermelho);
}

.header.fixed .open-main-nav.is-open .burger{
    background: var(--cor-branco);
    top: 0;
}

.header.fixed .open-main-nav.is-open .burger:after,
.header.fixed .open-main-nav.is-open .burger:before {
    background: var(--cor-branco);
}
.header.fixed .open-main-nav.is-open .burger-text {
    color: var(--cor-branco);
}



.header.fixed .open-main-nav{
    top: 25px;
}

.burger:after {
    transform: translateY(-12px) translateX(-2px) skew(-20deg);
}

.burger:before {
    transform: translateY(-16px) skew(-10deg);
}

.is-open .burger {
    transform: skew(5deg) translateY(-8px) rotate(-45deg);
}

.is-open .burger:before {
    transform: translateY(0px) skew(-10deg) rotate(75deg);
}

.is-open .burger:after {
    transform: translateY(-12px) translateX(10px) skew(-20deg);
    opacity: 0;
}

.burger-text {
    display: block;
    font-size: 1rem;
    letter-spacing: 0.05em;
    margin-top: 0.5em;
    text-transform: uppercase;
    font-weight: 500;
    text-align: center;
    color: #fff;
}