@import url("https://fonts.googleapis.com/css2?family=Open+Sans&display=swap");

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

:root {
    --HEADER-BGCOLOR: #f4f4f4;
    --HEADER-COLOR: #333;
    --MAIN-BGCOLOR: #f4f4f4;
    --MAIN-COLOR: #333;
}

html {
    font-size: 1.3rem;
    font-family: "Open Sans", sans-serif;
    line-height: 1.5rem;
}

@media screen and (max-width: 600px) {
    html {
        font-size: 1.1rem;
        line-height: 1.4rem;
    }
}

body {
    margin: 0;
    background: var(--MAIN-BGCOLOR);
    height: 100vh;
    color: var(--MAIN-COLOR);
    display: flex;
    flex-flow: column nowrap;
    padding: 0 2em 0em 2em;
}

header {
    padding: 1em 0;
    background: var(--HEADER-BGCOLOR);
    color: var(--HEADER-COLOR);
    min-height: 10vh;
}

header h1 {
    margin: 0 0em 0.4em 0.3em;
}

nav {
    display: flex;
    gap: 1em;
    justify-content: flex_start;
    flex-wrap: wrap;
}

header nav a {
    color: var(--HEADER-COLOR);
    padding: 0.3em 0.8em;
}

a {
    color: var(--MAIN-COLOR);
    text-decoration: none;
}

a:hover {
    opacity: 0.6;
}

@media screen and (max-width: 600px) {
    header h1 {
        line-height: 1em;
    }

    nav {
        justify-content: center;
        gap: 0.5em;
    }

    header nav a {
        padding: 0.6em 0.5em;
    }
}

main {
    margin: 4em auto 3em auto;
    background: var(--MAIN-BGCOLOR);
    color: var(--MAIN-COLOR);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

/* main */

@media screen and (min-width: 1200px) {
    main {
        width: 70%;
    }
}

@media screen and (max-width: 1199px) {
    main {
        width: 90%;
    }
}

main h2 {
    margin-bottom: 0.5em;
    border-bottom: 2px solid var(--MAIN-COLOR);
    padding-bottom: 0.2em;
}

/* .footer styles */

.footer {
    background: var(--HEADER-BGCOLOR);
    margin-top: 1em;
    color: var(--HEADER-COLOR);
    font-size: 0.9em;
    text-align: center;
    padding: 0 0 0.5em 0;
    width: 100%;
}

/* List styles */

ul {
    list-style-type: none;
    width: 100%;
}

@media (min-width: 660px) {
    ul {
        margin: 0 1.5em 1em 1.5em;
    }
}

@media screen and (max-width: 659px) {
    ul li {
        text-align: center;
    }
}

li {
    text-align: left;
    word-break: break-word;
}