:root {
    --bg-color: #f5f5f5;
    --white: #fff;
    --black: #000;
    --color-1: #00F5D4;
    --color-2: #009bf5;
    --color-3: #025878;
    --color-4: #F15BB5;
    --color-5: #9B5DE5;
    --color-6: darkcyan;
    --dark-1: #333333;
    --dark-2: #0e1217;
}

*, *::after, *::before {
    margin: 0;
    border: 0;
    box-sizing: border-box;
}

html {
    font-family: 'Poppins', sans-serif;
    font-size: 62.5%; /* font-size 1em = 10px on default browser settings */
}

body 
{
    font-size: 2.1rem;
}

p {
    margin-bottom: 1rem;
}


section:nth-child(2n+1)
{
    background-color: var(--bg-color);
}

section::before {
    content: '';
    display: block;
    height: 7.5rem;
    margin-top: -6.0rem;
    visibility: hidden;
  }


.hover-underline {
    font-size: 2rem;
    color: #ffffff;
    position: relative;
    display: inline-block;
}

.hover-underline::after,
.hover-underline::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, var(--color-2), var(--color-3));
    bottom: -5px;
    left: 0;
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.4s ease-out;
}

.hover-underline::before {
    top: -5px;
    transform-origin: left;
}

.hover-underline:hover::after,
.hover-underline:hover::before {
    transform: scaleX(1);
}


.navigation {
    position: sticky;
    top: 0;
    background: var(--bg-color);
    border-bottom: 4px solid var(--color-3);
    z-index: 999;
}

.navigation__item {
    text-decoration: none;
    list-style: none;
}



.navigation__item a {
    display: inline-block;
    text-decoration: none;
    color: var(--color-2)
}	

#presentation {
    text-align: center;
    padding-top: 2rem;
    background: var(--color-3);
    background: linear-gradient(90deg, var(--color-3) 0%, var(--color-2) 100%);
    color: var(--white);
}

.container {
    padding: 1rem;
    max-width: 130rem;
    margin: 0 auto;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 3rem;
}

.name {
    font-size: 3.4rem;
}

.profile-image {
    max-width: 100%;
    width: 20rem;
    border-radius: 50%;
}

.me {
    max-width: 80rem;
    text-align: left;
    padding-top: 2rem;
}

.flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    /* max-width: 80%;
    margin: 0 auto; */
}

section {
    padding-top: 4rem;
    padding-bottom: 4rem;
}

.title {
    text-align: center;
    margin-bottom: 4rem;
}

.button {
    display: inline-block;
    border: 1px solid;
    padding: 0.2rem 2rem;
    border-radius: 0.4rem;
    text-decoration: none;
}

.button--primary {
    background: var(--color-3);
    color: var(--white);
}

.button--primary:hover {
    background: var(--color-2);
}

.heart::before {
    content: "\1F499";
}

.card {
    display: flex;
    border: 1px solid #ccc;
    padding: 2rem;
    border-radius: 0.4rem;
    box-shadow: 4px 4px 5px #999;
    background-color: var(--white);
    color: var(--black);
}

.card .card__content {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.card .card__content .button{
    align-self: end;
    margin-top: auto;
}

.card-grid {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.card-grid .card {
    flex: 1 1 40rem;
    min-height: 18rem;

}

.repository {
    display: flex;
    gap: 2rem;
}

.repository .repository__name {
    font-size: 2.4rem;
}
.repository p {
    font-size: 1.8rem;
}
.repository .repository__img {
    width: 7rem;
}

.repository .repository__img img {
    width: 100%;
}


.timeline {
    position: relative;
    padding: 2rem 2rem 2rem 4rem;
    max-width: 100%;
}

.timeline::before {
    content: "";
    display: block;
    position: absolute;
    top: 0;
    left: 1rem;
    width: 0.5rem;
    height: 100%;
    background: var(--color-2);
}

.timeline__content {
    position: relative;
    padding: 2rem;
    margin-bottom: 2rem;
}

.timeline__content::before {
    content: "";
    width: 1.8rem;
    height: 1.8rem;
    background: var(--color-3);
    position: absolute;
    border-radius: 50%;
    left: -3.6rem;
    top: 3rem;
}

.timeline__content::after {
    content: " ";
    width: 50%;
    height: 0;
    display: block;
    position: absolute;
    top: 3.7rem;
    border: 3px dashed var(--color-3);
    left: -1rem;
    z-index: 1;
}

.timeline__event {
    max-width: 90%;
    margin: 0 auto;
    flex-wrap: wrap;
    position: relative;
    z-index: 2;
}

.timeline__event h2 {
    font-size: 2.2rem;
}

.timeline__event .timeline__description {
    display: block;
    font-size: 1.8rem;
    width: 100%;   
}

.footer {
    text-align: center;
    padding: 1.5rem;
    background: var(--dark-1);
    color: var(--white);        
    font-size: 1.6rem;
}

.footer p {
    margin-bottom: 0;
}

.footer a, .footer a:visited  {
    color: var(--white);
    text-decoration: none;
}

.publication {
    display: grid;
    grid-template-columns: 1fr 2fr;
    grid-gap: 6rem;
    font-size: 1.6rem;
    position: relative;
}

.publication a:visited {
    color: var(--black);
}

.publication__badges {
    margin-bottom: 1rem;
}

.publication__badge {
    padding: 0.5rem 1rem;
    border-radius: 0.6rem;
    font-size: 1.2rem;
    color: var(--white);
    font-weight: bold;
    display: inline-block;
}

.publication__badge a {
    color: var(--white);
    text-decoration: none;
}

.publication__badge a:visited {
    color: var(--white);
    text-decoration: none;
}
  
.publication__badge--open-source {
    background: var(--color-2);
}

.publication__badge--open-access {
    background: var(--color-3);
}

.publication__title {
    font-size: 1.8rem;
}

.publication__summary {
    font-weight: bold;
}

.publication__summary span {
    font-weight: normal;
    font-size: 1.2rem;
}

.publication__abstract {
    font-size: 1.4rem;
    border-top: 1px dashed;
    border-bottom: 1px dashed;
    padding: 1rem 0 1rem 0;
}

.img-responsive {
    max-width: 100%;
    height: auto;
}

@media only screen and (min-width: 900px) {
    #presentation {
        padding-top: 4rem;
        padding-bottom: 4rem;
        
    }

    .timeline {
        padding-left: 2rem;
    }

    .timeline::before {
        left: 50%;
    }

    .timeline__content {
        width: 50%;
        display: flex;
        z-index: 2;
    }

    .timeline__content::after { 
        width: 6.6rem;
        z-index: 1;
    }

    .timeline__content:nth-child(2n+1)::before {
        left: auto;
        right: -1.1rem;
    }

    .timeline__content:nth-child(2n+1)::after {
        right: 1.5rem;
        left: auto;
    }
    
    /* Move the card to the right */
    .timeline__content:nth-child(2n) {
        transform: translateX(100%);
        display: flex;
        justify-content: end;
    }
    
    .timeline__content:nth-child(2n)::before {
        left: -0.6rem;
    }

    .timeline__content:nth-child(2n)::after {
        left: 1.7rem;
    }

    .timeline__content:nth-child(2n+1) .timeline__event.card {
        box-shadow: -4px 4px 5px #999;
    }

    .timeline__event {
        margin: inherit;
    }
}