html {
    font-size: 100%; 
    /* browser default size for scalabiliy */
}

body {
    /* increase the base font size to 18px, this will give a line-height of 27px */
    font-size: 1.125rem;
    font-family: Arial, Helvetica, sans-serif;
    color: #323232;
}

.inner-container {
    max-width: 1900px;
    margin: 0 auto;
    padding: 1rem;
}

/* ************************ typography *************** */
h1 {
    /* to keep with the baseline sizing, add a line height that is either 27px or a multiplier of 27 */
    font-size: 2rem;
    line-height: 3.375rem;
}

h1 a {
    color: #323232;
    text-decoration: none;
}

/* *********************** header ********************** */
header {
    border-bottom: 1px solid rgb(222, 222, 222);
    box-shadow: 0 0 8px rgb(222, 222, 222);
}

header > .inner-container {
    display: flex;
    align-items: center;
    flex-flow: wrap;
    justify-content: space-between;
}

header nav {
    flex: 0 0 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height ease-in-out 1s;
}

.show {
    max-height: 400px;
}

header button {
    width: 3.4375rem;
    padding: 0.5rem;
    background-color: #fff;
    border: none;
}

.nav-links li {
    line-height: 3.5rem;
    margin-bottom: 0.75rem;
}

.nav-links a {
    display: block;
    padding-left: 0.75rem;
}

@media screen and (min-width: 600px) {
    .ham-btn {
        display: none;
    }

    header nav {
        max-height: unset;
        flex: 0 1 auto;
    }

    .nav-links {
        display: flex;
        gap: 1rem;
    }
}

/* ****************** main **************** */
.recent-posts > article {
    margin-bottom: 1rem;
}

.popular-posts > article {
    border: 1px solid #ccc;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.popular-posts div {
    padding: 0 1rem;
}

@media screen and (min-width: 950px) {
    .grid-container {
        display: grid;
        grid-template-columns: repeat(12, 1fr);
        gap: 1rem;
    }

    .recent-posts {
        grid-column: 1 / span 8;
        /* similar to align-items from flexbox - except this goes on the child that is stretching from top to bottom */
        align-self: start;
    }

    .popular-posts {
        grid-column: 9 / span 4;
    }
}

@media screen and (min-width: 1350px) {
    .recent-posts {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .recent-posts h2,
    .recent-posts article:first-of-type {
        grid-column: 1 / -1;
    }

    .popular-posts h2 {
        margin-bottom: 1rem;
    }
}

@media screen and (min-width: 1900px) {
    .popular-posts article {
        display: flex;
        align-items: flex-start;
    }
}

/* ****************** footer **************** */
footer {
    border-top: 1px solid rgb(222, 222, 222);
}

footer .col {
    margin-bottom: 1rem;
}

footer a {
    display: block;
}

footer li {
    line-height: 3rem;
    margin-bottom: 0.75rem;
}

footer input {
    line-height: 2.5rem;
    padding-left: 0.5rem;
    width: 100%;
}

@media screen and (min-width: 500px) {
    .footer-grid-container {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 1rem;
    }

    footer .col:first-of-type,
    footer .col:last-of-type {
        grid-column: 1 / -1;
    }

    footer .col:nth-of-type(2),
    footer .col:nth-of-type(3) {
        grid-column: span 2;
    }
}

@media screen and (min-width: 850px) {
    footer .col:first-of-type {
        grid-column: 1 / span 2;
    }

    footer .col:nth-of-type(2),
    footer .col:nth-of-type(3) {
        grid-column: span 1;
    }

}

@media screen and (min-width: 1320px) {
    footer .col:first-of-type {
        grid-column: 1 / span 1;
    }

    footer .col:last-of-type {
        grid-column: 4 / span 1;
    }
}