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

/* =================
    Site Layout 
   ================= */

body {
    display: grid;
    grid-template-columns: 1em 1fr 1em;
    grid-template-areas:
        ".... .... ...." 
        ".... head ...."
        ".... main ...."
        ".... foot ...."
        ".... .... ....";
    gap: 1em 0;
}

.site-header {
    grid-area: head;
}

footer {
    grid-area: foot;
}

/* =================
    Main Element Layout 
   ================= */
   
main {
    grid-area: main;
    display: grid;
    gap: 1em;
    grid-template-columns: 1fr;
    grid-template-areas: 
        "tech"
        "envi"
        "nasa"
        "phys"
        "heal";     
}

@media(min-width: 500px) {
    main {
        grid-template-columns: 1fr 1fr;
        grid-template-areas: 
            "tech tech"
            "envi nasa"
            "phys nasa"
            "heal heal"
    } 
}
   
@media(min-width: 870px){
    main {
        grid-template-columns: repeat(12, 1fr);
        grid-template-columns: repeat(9, 1fr) repeat(3, minmax(70px, 1fr));
        grid-template-areas: 
            "tech tech tech tech tech tech envi envi envi nasa nasa nasa"
            "phys phys phys heal heal heal heal heal heal nasa nasa nasa"
    }
}

.technology {
    grid-area: tech;
}
    
.environment {
    grid-area: envi;
}

.nasa {
    grid-area: nasa;
}

.physics { 
    grid-area: phys;
}

.health {
    grid-area: heal;
}

/* =================
    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;
}