/* 
    * {
      border: 0;
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    } */
  
    :root {
      --hue: 223;
      --bg: hsl(var(--hue), 10%, 90%);
      --fg: hsl(var(--hue), 10%, 10%);
      --primary: hsl(var(--hue), 90%, 50%);
      --trans-dur: 0.3s;
      --trans-timing: cubic-bezier(0.65, 0, 0.35, 1);
      font-size: calc(16px + (24 - 16) * (100vw - 320px) / (2560 - 320));
    }
   
   
  
    .timelines h1 {
      font-size: 2em;
      margin: 0 0 3rem;
      padding-top: 1.5rem;
      text-align: center;
    }
  
    .timelines .btn {
      background-color: var(--fg);
      border-radius: 0.25em;
      color: var(--bg);
      cursor: pointer;
      padding: 0.375em 0.75em;
      transition:
        background-color calc(var(--trans-dur) / 2) linear,
        color var(--trans-dur);
      -webkit-tap-highlight-color: transparent;
    }
  
    .timelines .btn:hover {
      background-color: hsl(var(--hue), 10%, 50%);
    }
  
    .timelines .btn-group {
      display: flex;
      gap: 0.375em;
      margin-bottom: 1.5em;
    }
  
    .timelines  .timeline {
      margin: auto;
      padding: 0 1.5em;
      width: 100%;
      /* max-width: 36em; */
    }
  
    .timelines .timeline__arrow {
        border: none;
      background-color: transparent;
      border-radius: 0.25em;
      cursor: pointer;
      flex-shrink: 0;
      margin-inline-end: 0.25em;
      outline: transparent;
      width: 2em;
      height: 2em;
      transition:
        background-color calc(var(--trans-dur) / 2) linear,
        color var(--trans-dur);
      -webkit-appearance: none;
      appearance: none;
      -webkit-tap-highlight-color: transparent;
    }
  
    .timelines .timeline__arrow:focus-visible,
    .timelines .timeline__arrow:hover {
      background-color: hsl(var(--hue), 10%, 50%, 0.4);
    }
  
    .timelines .timeline__arrow-icon {
      display: block;
      pointer-events: none;
      transform: rotate(-90deg);
      transition: transform var(--trans-dur) var(--trans-timing);
      width: 100%;
      height: auto;
    }
  
    .timelines .timeline__date {
      font-size: 0.833em;
      line-height: 2.4;
    }
  
    .timelines .timeline__dot {
      background-color: currentColor;
      border-radius: 50%;
      display: inline-block;
      flex-shrink: 0;
      margin: 0.625em 0;
      margin-inline-end: 1em;
      position: relative;
      width: 0.75em;
      height: 0.75em;
    }
  
    .timelines .timeline__item {
      position: relative;
      padding-bottom: 2.25em;
    }
  
    .timelines .timeline__item:not(:last-child):before {
      background-color: currentColor;
      content: "";
      display: block;
      position: absolute;
      top: 1em;
      left: 2.625em;
      width: 0.125em;
      height: 100%;
      transform: translateX(-50%);
    }
  
    [dir="rtl"] .timelines  .timeline__arrow-icon {
      transform: rotate(90deg);
    }
  
    [dir="rtl"] .timelines  .timeline__item:not(:last-child):before {
      right: 2.625em;
      left: auto;
      transform: translateX(50%);
    }
  
    .timelines .timeline__item-header {
      display: flex;
    }
  
    .timelines .timeline__item-body {
      border-radius: 0.375em;
      overflow: hidden;
      margin-top: 0.5em;
      margin-inline-start: 4em;
      height: 0;
    }
  
    .timelines .timeline__item-body-content {
      background-color: hsl(var(--hue), 10%, 50%, 0.2);
      opacity: 0;
      padding: 0.5em 0.75em;
      visibility: hidden;
      transition:
        opacity var(--trans-dur) var(--trans-timing),
        visibility var(--trans-dur) steps(1, end);
    }
  
    .timelines  .timeline__meta {
      width: 100%;
    }
  
    .timelines .timeline__title {
      font-size: 1.5em;
      line-height: 1.333;
    }
  
    /* Expanded state */
    .timelines .timeline__item-body--expanded {
      height: auto;
    }
  
    .timelines .timeline__item-body--expanded .timeline__item-body-content {
      opacity: 1;
      visibility: visible;
      transition-delay: var(--trans-dur), 0s;
    }
  
    .timelines .timeline__arrow[aria-expanded="true"] .timeline__arrow-icon {
      transform: rotate(0);
    }
  
    /* Dark theme */
    @media (prefers-color-scheme: dark) {
      :root {
        --bg: hsl(var(--hue), 10%, 10%);
        --fg: hsl(var(--hue), 10%, 90%);
        --primary: hsl(var(--hue), 90%, 70%);
      }
    }