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

body {   
}

.container_timeline {
    --color: rgba(30, 30, 30);
    --bgColor: rgba(245, 245, 245);
    min-height: 100vh;
    display: grid;
    align-content: center;
    gap: 2rem;
    padding: 2rem;
    font-family: "Poppins", sans-serif;
    color: var(--color);
    background: var(--bgColor);
}


.container_timeline ul {
    --col-gap: 2rem;
    --row-gap: 2rem;
    --line-w: 0.25rem;
    display: grid;
    grid-template-columns: var(--line-w) 1fr;
    grid-auto-columns: max-content;
    column-gap: var(--col-gap);
    list-style: none;
    width: min(60rem, 90%);
    margin-inline: auto;
}
/* line */
.container_timeline ul::before {
    content: "";
    grid-column: 1;
    grid-row: 1 / span 20;
    background: rgb(225, 225, 225);
    border-radius: calc(var(--line-w) / 2);
}
/* row gaps */
.container_timeline ul li:not(:last-child) {
    margin-bottom: var(--row-gap);
}
/* card */
.container_timeline ul li {
    grid-column: 2;
    --inlineP: 1.5rem;
    margin-inline: var(--inlineP);
    grid-row: span 2;
    display: grid;
    grid-template-rows: min-content min-content min-content;
}

/* date */
.container_timeline ul li .date {
    --dateH: 3rem;
    height: var(--dateH);
    margin-inline: calc(var(--inlineP) * -1);
    text-align: center;
    background-color: var(--accent-color);
    color: white;
    font-size: 1.25rem;
    font-weight: 700;
    display: grid;
    place-content: center;
    position: relative;
    border-radius: calc(var(--dateH) / 2) 0 0 calc(var(--dateH) / 2);
}

/* date flap */
.container_timeline ul li .date::before {
    content: "";
    width: var(--inlineP);
    aspect-ratio: 1;
    background: var(--accent-color);
    background-image: linear-gradient(rgba(0, 0, 0, 0.2) 100%, transparent);
    position: absolute;
    top: 100%;

    clip-path: polygon(0 0, 100% 0, 0 100%);
    right: 0;
}
/* circle */
.container_timeline ul li .date::after {
    content: "";
    position: absolute;
    width: 2rem;
    aspect-ratio: 1;
    background: var(--bgColor);
    border: 0.3rem solid var(--accent-color);
    border-radius: 50%;
    top: 50%;

    transform: translate(50%, -50%);
    right: calc(100% + var(--col-gap) + var(--line-w) / 2);
}
/* title descr */
.container_timeline ul li .title,
.container_timeline ul li .descr {
    background: var(--bgColor);
    position: relative;
    padding-inline: 1.5rem;
}
.container_timeline ul li .title {
    overflow: hidden;
    padding-block-start: 1.5rem;
    padding-block-end: 1rem;
    font-weight: 500;
}
.container_timeline ul li .descr {
    padding-block-end: 1.5rem;
    font-weight: 300;
}

/* shadows */
.container_timeline ul li .title::before,
.container_timeline ul li .descr::before {
    content: "";
    position: absolute;
    width: 90%;
    height: 0.5rem;
    background: rgba(0, 0, 0, 0.5);
    left: 50%;
    border-radius: 50%;
    filter: blur(4px);
    transform: translate(-50%, 50%);
}
.container_timeline ul li .title::before {
    bottom: calc(100% + 0.125rem);
}
.container_timeline ul li .descr::before {
    z-index: -1;
    bottom: 0.25rem;
}
@media (min-width: 40rem) {
    .container_timeline ul {
        grid-template-columns: 1fr var(--line-w) 1fr;
    }
    .container_timeline ul::before {
        grid-column: 2;
    }
    .container_timeline ul li:nth-child(odd) {
        grid-column: 1;
    }
    .container_timeline ul li:nth-child(even) {
        grid-column: 3;
    }
    /* start second card */
    .container_timeline ul li:nth-child(2) {
        grid-row: 2/4;
    }
    .container_timeline ul li:nth-child(odd) .date::before {
        clip-path: polygon(0 0, 100% 0, 100% 100%);
        left: 0;
    }
    .container_timeline ul li:nth-child(odd) .date::after {
        transform: translate(-50%, -50%);
        left: calc(100% + var(--col-gap) + var(--line-w) / 2);
    }
    .container_timeline ul li:nth-child(odd) .date {
        border-radius: 0 calc(var(--dateH) / 2) calc(var(--dateH) / 2) 0;
    }
}


:root {
    --bg-color:rgb(71,72,75);
    --bg-light-color: #fff;
    --bg-dark-color: rgb(71,72,75);
    --light-link-color: #fff;
    --dark-link-color: #333;
    --light-font-color: #fff;
    --dark-font-color:#333;
    --color-link: #1352d1;
    --color-link-hover: #111;
}


//body, html { font-size: 100%; padding: 0; margin: 0;}
body.light {
    background-color: var(--bg-light-color);
    color: var(--dark-font-color);
}
body.light a{
    color: var(--dark-link-color);
}
body.dark{
    background-color: var(--bg-dark-color);
    color:var(--light-font-color)
}
body.dark a{
    color:var(--light-link-color)
}

/* Reset */
*,
*:after,
*:before {
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
}

ul, li {
	
}