:root {
    --almost-white: hsl(0, 0%, 98%);
    --medium-gray: hsl(0, 0%, 41%);
    --almost-black: hsl(0, 0%, 8%);
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: "Epilogue", sans-serif;
    line-height: 1.4;
    letter-spacing: 1px;
}

header {
    margin: 2em;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 1em 0;
}

nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 3.75em;
}

nav a {
    text-decoration: none;
    color: var(--almost-black);
    font-size: 1rem;
    display: block;
    font-weight: 500;
}

nav a:hover, nav a:focus {
    color: var(--medium-gray);
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    margin-right: 1em;
}

.register-btn {
    border: 1px solid var(--almost-black);
    border-radius: 10px;
    padding: .5em 1em;
}

#dropdown-menu-1 a, #dropdown-menu-2 a {
    text-decoration: none;
    color: var(--almost-black);
    font-size: .8rem;
    display: block;
    font-weight: 500;
    margin: .5em 0;
}

#dropdown-menu-1 a:hover,
#dropdown-menu-2 a:hover {
    background-color: #F3D8C7;
    width: fit-content;
}

#dropdown-menu-1, #dropdown-menu-2 {
    display: none;
    flex-direction: column;
    padding: 1.5em;
    box-shadow: 1px 1px 6px black;
    border-radius: 5px;
    min-width: 9rem;
    text-align: left;
    position: absolute;
}

.flex {
    display: flex;
}

.link-container-1 {
    position: relative;
}

.container {
    width: 75%;
    margin: 0 auto;
}

.flex-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.title {
    font-size: 4rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--almost-black);
}

.subtitle {
    color: var(--medium-gray);
}

.learn-btn {
    cursor: pointer;
    font-weight: 700;
    background-color: var(--almost-black);
    color: var(--almost-white);
    padding: 1em 2.5em;
    border: 1px solid var(--almost-black);
    border-radius: 10px;
    font-size: 1rem;
}

.learn-btn:hover, .learn-btn:focus {
    background-color: var(--almost-white);
    color: var(--almost-black);
}

.main-image {
    height: 90vh;
    max-width: 100%;
    display: block;
}

.text-container {
    height: 90vh;
}

.flex-gallery {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 2em;
}

.mobile-nav {
    display: none;
}

@media screen and (max-width: 1000px) {
    .desktop-nav {
        display: none;
    }

    .mobile-nav {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    #nav-menu {
        position: fixed;
        right: -100%;
        top: 5rem;
        flex-direction: column;
        background-color: #fff;
        width: 35%;
        text-align: center;
        transition: 0.3s;
        text-align: left;
        padding: 1em 6em 1em 3em;
        display: flex;
        align-items: flex-start;
        height: 100%;
        margin: 0;
    }

    #nav-menu li {
        margin: 0;
        padding: 0;
    }

    .hamburger {
        cursor: pointer;
    }

    #dropdown-menu-3,
    #dropdown-menu-4 {
        display: none;
        padding: 1em;
        margin-left: auto;
        margin-right: auto;
        min-width: 9rem;
        list-style: none;
    }

    #dropdown-menu-3 a, #dropdown-menu-4 a {
        margin: 1em 0;
    }

    .container {
        width: 90%;
    }

    .flex-container {
        flex-direction: column;
    }

    .main-image {
        order: -1;
        height: 40vh;
        width: 100vw;
        object-fit: cover;
    }

    .title {
        margin-bottom: 0;
        font-size: 3rem;
    }

    .flex-gallery img {
        width: 20%;
    }

    .login, .register-btn {
        margin: 0 auto;
    }
}

@media screen and (max-width: 700px) {
    #nav-menu {
        width: 70%;
    }
}