@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');

body {
    background-color: #000;
    color: #fff;
    font-family: 'Roboto', sans-serif;
    overflow-x: hidden;
}

a {
    color: #000;
    text-decoration: none;
}

a:hover,
a:focus {
    color: #000;
    text-decoration: none;
}

#container {
    transition: 1s all ease-in-out;
}

#container.menuopen {
    filter: blur(8px);
    transform: scale(1.2);
}

section {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    position: relative;
    background-size: cover;
    padding: 50px;
}

section::after {
    content: "";
    position: absolute;
    background-color: #000;
    height: 100%;
    width: 100%;
    top: 0;
    left: 0;
    opacity: 0.5;
}

section h1 {
    font-size: 120px;
    z-index: 2;
}

header {
    z-index: 9999;
    position: relative;
}

header #logo {
    position: fixed;
    top: 30px;
    left: 0;
    right: 0;
    width: 70px;
    height: auto;
    margin: 0 auto;
    opacity: 1;
    transition: all 0.3s cubic-bezier(0.215, 0.61, 0.355, 1) 0.6s;
}

header nav {
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    left: 0;
    right: 0;
    width: 85%;
    z-index: 100;
    top: 130px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: 1s all cubic-bezier(0.080, 0.9, 0.18, 1) 0.2s;
}

header nav a {
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    padding: 10px 16px;
    font-size: 18px;
    letter-spacing: 1.8px;
    transition: 0.3s all cubic-bezier(0.080, 0.9, 0.18, 1) 0.6s, 0.3s color ease;
}

header nav a:hover {
    color: #000;
}

header nav button {
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    width: 60px;
    height: 60px;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    position: absolute;
    z-index: 100;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;
    border-radius: 100%;
    cursor: pointer;
    transform: scale(0);
    transition: 0.3s all cubic-bezier(0.080, 0.9, 0.18, 1) 0.2s;
}

header nav button span {
    width: 50%;
    background-color: #fff;
    height: 3px;
    display: block;
    margin: 4px auto;
    transform: scale(0);
    transition: 0.6s transform cubic-bezier(0.080, 0.9, 0.18, 1) 0s, 0.3s margin ease-in 0s;
}

header nav button:hover span {
    margin: 9px auto;
}

header.sticky #logo {
    opacity: 0;
}

header.sticky nav {
    top: 20px;
    padding: 0;
    width: 80px;
    height: 80px;
}

header.sticky nav button {
    transform: scale(1);
    transition-delay: 0.3s;
}

header.sticky nav button span {
    transform: scaleX(1);
    transition: 0.6s transform cubic-bezier(0.080, 0.9, 0.18, 1) 0.8s, 0.3s margin ease-in 0s;
}

header.sticky nav a {
    opacity: 0;
    transform: scale(0.3);
    transition-delay: 0.1s;
}

@media screen and (max-width: 520px) {

    header nav {
        height: 60px;
        width: 390px;
    }

    header nav button {
        width: 50px;
        height: 50px;
    }

    header nav a {
        font-size: 16px;
    }

    section h1 {
        font-size: 80px;
    }

    header.sticky nav {
        width: 70px;
        height: 70px;
    }

}