:root{
    /*----------------- FONT FAMILY -----------------*/
    --font-family: "Poppins", sans-serif;

    /*----------------- FONT SIZE -----------------*/
    --font-size-sm:1.5rem;
    --font-size-md:1.8rem;
    --font-size-lg:2.4rem;

    /*----------------- FONT WEIGHTS -----------------*/
    --font-weight-regular:200;
    --font-weight-medium:400;
    --font-weight-bold:600;

    /*----------------- LINE HEIGHT -----------------*/
    --line-height-regular: 1.5;
    --line-height-tight: 1.2;

    /*----------------- COLORS -----------------*/
    /*-------- PRIMARY --------*/
    --color-primary-1:hsl(180, 62%, 55%);
    --color-primary-2:hsl(0, 78%, 62%);
    --color-primary-3:hsl(34, 97%, 64%);
    --color-primary-4:hsl(212, 86%, 64%);

    /*-------- NEUTRAL --------*/
    --grey-text-primary:hsl(234, 12%, 34%);
    --grey-text-secondary:hsl(212, 6%, 44%);
    --white:hsl(0, 0%, 100%);
}

html {
    font-size: 62.5%; /* 1rem = 10px*/
    /* 10px / 16px = 62.5% */
}

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

body{
    font-family: var(--font-family);
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.main-container {
    max-width: 1200px;
    width: 90%;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.heading-paragraph-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.1rem;
}

.heading, .subheading{
    font-size: var(--font-size-lg);
}

.heading {
    font-weight: var(--font-weight-regular);
    color: var(--grey-text-secondary);
}

.subheading {
    font-weight: var(--font-weight-bold);
    color: var(--grey-text-primary);
}

.main-paragraph {
    color: var(--grey-text-secondary);
    font-size: var(--font-size-sm);
}


/* -------------- CARDS CONTAINER -------------- */
.cards-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin: 4rem;
}

.card2-card3-container {
    display: grid;
    row-gap: 2rem;
}

.cards {
    background-color: var(--white);
    padding: 3rem;
    border-radius: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

.card-heading {
    font-size: var(--font-size-md);
    color: var(--grey-text-primary);
}

.card-paragraph {
    font-size: var(--font-size-sm);
    color: var(--grey-text-secondary);
    margin-bottom: 4rem;
}

.card-1{
    border-top: 4px solid var(--color-primary-1);
    align-self: center;
}

.card-2{
    border-top: 4px solid var(--color-primary-2);
}

.card-3{
    border-top: 4px solid var(--color-primary-3);
}

.card-4{
    border-top: 4px solid var(--color-primary-4);
    align-self: center;
}

.icons{
    width: 5rem;
    align-self: flex-end;
}


/* --------- FOOTER ------------*/
.attribution{
    font-size: var(--font-size-sm);
    color: var(--grey-text-primary);
}

.attribution a{
    text-decoration: none;
}

.attribution a:link, .attribution a:visited {
    color: var(--color-primary-4);
}

.attribution a:hover, .attribution a:active {
    text-decoration: underline;
    color: var(--color-primary-1);
}