html, body {
    margin: 0;
    padding: 0;
    font-family: 'Manrope', sans-serif;
}

body {
    margin: 1em;
}

/* =================
    Layout
   ================= */
   
/*
Challenge 1:
    1. Assign each card a grid-area name.
*/
   
.technology {
}

.environment {
}
    
.nasa {
}

.physics { 
}

.health {
} 

/*
Challenge 2:
    1. Use grid-template-areas to define 
       the layout at each size.
       (Keep the existing column templates.) 
*/

main {
    display: grid;
    gap: 1em;
    grid-template-columns: 1fr;
}

@media (min-width: 500px) {
    main {
        grid-template-columns: 1fr 1fr;
    } 
}

@media (min-width: 870px) {
    main {
        grid-template-columns: repeat(12, 1fr)
    }
}

/* =================
    Article Card 
   ================= */

a:hover, a:focus {
    filter: brightness(0.9);
}

a:focus {
    outline: 3px solid #5a5a5a;
    box-shadow: 0 0 0 3px rgba(135,18,113,0.5); 
    transition: outline 0.2s ease, box-shadow 0.2s ease;
}

article {
    border-radius: 0.2em;
    background-color: #e5e5e5;
    height: 100%;
}

.article-header {
    box-sizing: border-box;
    padding: 1em;
    width: 100%;
}


/* =================
    Typography 
   ================= */

h1 {
    color: #0F0F0F; 
    letter-spacing: 0.04em;
    font-family: "Source Code Pro", sans-serif;
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
}

h2 {
    font-size: 0.88rem;
    color: #5D0E50;
    margin: 0;
    letter-spacing: 0.065em;
    text-transform: uppercase;
}

h3 {
    font-size: 1rem;
    margin: .4em 0;
    letter-spacing: 0.03em;
    color: #111111;
    font-weight: 500;
}

p {
    margin: 0;
    font-size: .85rem;
    color: #7c7c7c;
}

/* =================
    Images 
   ================= */

img {
    width: 100%;
    border-top-left-radius: .2em;
    border-top-right-radius: .2em;
}