:root {
      scroll-behavior: smooth;
      --sprucePine: #003a00; 
      --kentuckyNight: #000d08;
      --mountainFog: #f0fff8; 
      --stormCloud: #333849;
      --campfireSmoke: #2f2e2eb3;
      --smokeyMountainMist: #b0c4de;
      --blueRidgeParkway: #002167;
      --starLight: #e1ceff; 
      --midnightBlue: #001f3f;
      --transparentMidnight: #001f3f80;
      --marianaTrench: #00111f;
        --spacing-sm: 0.5rem;
        --spacing-md: 1rem;
        --spacing-lg: 2rem;
    }

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

body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: var(--blueRidgeParkway)
}

header {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 5vh 0;
    row-gap: 20px;
    box-sizing: border-box;
}


.timeline-container {
    margin-top: 20px;
    max-width: 100vw;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.line {
    position: absolute;
    left: 50%;
    height: 1600px;
    width: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 100px;
    transform: translateX(-50%);
    background-color: var(--mountainFog);
}

.line a {
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    bottom: 0;
    width: 50px;
    height: 50px;
    font-weight: bold;
    color: rgb(55, 131, 65);
    background-color: var(--mountainFog);
    border-radius: 50%;
    cursor: pointer;
    overflow: hidden;
}

.card {
    font-size: 1rem;
    width: 200px;
    height: fit-content;
    border-radius: 10px;
    background-color: var(--marianaTrench);
    margin-bottom: 10px;
}

.card > a {
text-decoration: none;
font-style: italic;
font-weight: 600;
font-size: 1.1rem; 
cursor: pointer;
color: var(--mountainFog);
text-align: center;
}

.left {
    position: relative;
    left: -150px;
}

.right {
    position: relative;
    left: 150px;
}

.left::after,
.right::after {
    content: '';
    position: absolute;
    width: 35px;
    height: 35px;
    background-color: var(--midnightBlue);
    border-radius: 0px 10px;
    transform: rotate(-45deg);
    z-index: -1;
}

.left::after {
    top: 5px;
    right: -10px;
}

.right::after {
    top: 5px;
    left: -10px;
}

.card h1 {
    padding: 5px;
    display: flex;
    justify-content: center;
    border-radius: 10px 10px 0 0;
    color: white;
    background-color: var(--midnightBlue);
}

.card p {
    padding: 10px;
}

.thumbnail {
    position: absolute;
    top: 0;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    overflow: hidden;
}

.thumbnail img {
    width: 100%;
    height: 100%;
}

.left .thumbnail {
    left: 113%;
}

.right .thumbnail {
    right: 225px;
}

@media screen and (max-width:790px) {
    body {
        text-align: center;
    }

    .main-container {
        width: auto;
    }

    .line {
        height: 1550px;
    }

    .card {
        top: 70px;
        margin-bottom: 100px;
    }

    .left::after,
    .right::after {
        visibility: hidden;
    }

    .left {
        left: auto;
    }

    .right {
        left: auto;
    }

    .left .thumbnail {
        top: -70px;
        left: 75px;
    }

    .right .thumbnail {
        top: -70px;
        left: 75px;
    }
}