:root {
    --level-1: #5a82cc;
    --level-2: #7e9cd4;
    --level-3: #3063c1;
    --level-4: #a6bae0;
    --black: black;
  }
  * {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
  }
  /*ol {
    list-style: none;
  }*/
  /* body {
    margin: 50px 0 100px;
    text-align: center;
    font-family: "Inter", sans-serif;
  } */
  .container {
    max-width: 1000px;
    padding: 0 0px;
    text-align: center;
    margin: 0 auto;
  }

  .rectangle {
    position: relative;
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
  }

  .rectangle a {
    text-decoration: none;
    color: #333;
  }

  .rectangle:hover {
    background-color: #1555a3;
  }

  .level-1 {
    width: 50%;
    margin: 0 auto 40px;
    background: var(--level-1);
  }
  .level-1::before {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 20px;
    background: var(--black);
  }

  .level-2-wrapper {
    position: relative;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
  }
  .level-2-wrapper::before {
    content: "";
    position: absolute;
    top: -20px;
    left: 10%;
    width: 80%;
    height: 2px;
    background: var(--black);
  }

  .level-2-wrapper::after {
    display: none;
    content: "";
    position: absolute;
    left: -20px;
    bottom: -20px;
    width: calc(100% + 20px);
    height: 2px;
    background: var(--black);
  }

  .level-2-wrapper li {
    position: relative;
  }

  /* vertical top*/

  .level-2-wrapper > li::before {
    content: "";
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 20px;
    background: var(--black);
  }

  .level-2 {
    width: 90%;
    margin: 0 auto 10px;
    background: var(--level-2);
  }

   /* vertical below*/

  .level-2::after {
    display: none;
    content: "";
    position: absolute;
    top: 50%;
    left: 0%;
    transform: translate(-100%, -50%);
    width: 20px;
    height: 2px;
    background: var(--black);
  }

  .level-3-wrapper {
    position: relative;
    width: 80%;
    margin-left: auto;
  }
  .level-3-wrapper::before {
    content: "";
    position: absolute;
    top: -20px;
    left: -20px;
    width: 2px;
    height: calc(100% + 20px);
    background: var(--black);
  }
  .level-3-wrapper li + li {
    margin-top: 20px;
  }
  .level-3 {
    font-weight: normal;
    background: var(--level-4);
  }
  .level-3::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 0%;
    transform: translate(-100%, -50%);
    width: 20px;
    height: 2px;
    background: var(--black);
  }

  button {
    margin-bottom: 20px;
    border-radius: 12px;
    color: black;
  }

  .collapsible {
  background-color: #7e9cd4;
  color: black;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;
}

.active, .collapsible:hover {
  background-color: #a6bae0;
}

.content {
  padding: 0 18px;
  display: none;
  overflow: hidden;
  background-color: white;
}