* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    --theme: white;
}

html.dark {
    --theme: rgb(18, 17, 17);
}

body {
    font-family: "Cairo", sans-serif;
}

.container {
    padding-left: 10px;
    padding-right: 10px;
}

@media (max-width: 639px) {
    ul.links {
        display: block;
        position: absolute;
        top: 100%;
        width: 100%;
        left: 0;
        background-image: url("../assets/menu.png");
        background-repeat: no-repeat;
        background-size: cover;
        color: white;
        padding: 10px 0;
        opacity: 0;
        transition: 0.3s;
        visibility: hidden;
    }

    ul.links.clicked {
        opacity: 1;
        visibility: visible;
    }

    ul.links li {
        margin: 10px 0;
        position: relative;
        text-align: center;
    }

    ul.links a {
        width: 100%;
        display: block;
        padding: 0;
    }

    ul.links a:hover {
        color: rgb(2, 134, 211);
        font-weight: bold;
    }

    ul.links li:not(:last-child) {
        border-bottom: 2px solid white;
        padding-bottom: 10px;
    }

    ul.links:before {
        position: absolute;
        content: "";
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
    }
}

@media (max-width: 330px) {
    a.logo {
        width: 150px;
    }

    header .container {
        flex-direction: column;
        gap: 20px
    }
}

.landing {
    background-image: radial-gradient(#c1d9ff 0%, var(--theme));
}

html.dark .landing {
    background-image: radial-gradient(#001434 0%, var(--theme))
}

.testimonials {
    background-color: var(--theme) !important;
}

.feat {
    background-color: var(--theme) !important;
}

i.arrow {
    translate: 0px -20px;
    box-shadow: 0px 5px 10px -4px black
}

@media (max-width: 639px) {
    i.arrow {
        translate: 0px 20px;
    }
}

i.arrow:hover {
    scale: 1.1;
}

img.learning {
    animation: up-down 2s ease-in-out infinite alternate;
}

@keyframes up-down {
    0% {
        translate: 0 0;
    }

    100% {
        translate: 0 -20px;
    }
}

@media (max-width: 500px) {
    .feat img {
        height: 100px;
    }
}

@media (max-width: 250px) {
    .feat img {
        height: 50px;
    }
}

.feat img {
    transition: 0.3s;
    -webkit-transition: 0.3s;
    -moz-transition: 0.3s;
    -ms-transition: 0.3s;
    -o-transition: 0.3s;
}

.heading {
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.group {
    filter: blur(2px);
    -webkit-filter: blur(2px);
}

.footer {
    background-color: var(--theme) !important;
}