 /* RESET STYLES & HELPER CLASSES–––––––––––––––––––––––––––––––––––––––––––––––––– */
 
 :root {
     --level-1: #8dccad;
     --level-2: #f5cc7f;
     --level-3: #7b9fe0;
     --level-4: #f27c8d;
     --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 10px;
     margin: 0 auto;
     text-align: center;
 }
 
 .rectangle {
     position: relative;
     padding: 20px;
     box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
 }
 /* LEVEL-1 STYLES –––––––––––––––––––––––––––––––––––––––––––––––––– */
 
 .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 STYLES –––––––––––––––––––––––––––––––––––––––––––––––––– */
 
 .level-2-wrapper {
     position: relative;
     display: grid;
     grid-template-columns: repeat(2, 1fr);
 }
 
 .level-2-wrapper::before {
     content: "";
     position: absolute;
     top: -20px;
     left: 25%;
     width: 50%;
     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;
 }
 
 .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: 70%;
     margin: 0 auto 40px;
     background: var(--level-2);
 }
 
 .level-2::before {
     content: "";
     position: absolute;
     top: 100%;
     left: 50%;
     transform: translateX(-50%);
     width: 2px;
     height: 20px;
     background: var(--black);
 }
 
 .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 STYLES –––––––––––––––––––––––––––––––––––––––––––––––––– */
 
 .level-3-wrapper {
     position: relative;
     display: grid;
     grid-template-columns: repeat(2, 1fr);
     grid-column-gap: 20px;
     width: 90%;
     margin: 0 auto;
 }
 
 .level-3-wrapper::before {
     content: "";
     position: absolute;
     top: -20px;
     left: calc(25% - 5px);
     width: calc(50% + 10px);
     height: 2px;
     background: var(--black);
 }
 
 .level-3-wrapper>li::before {
     content: "";
     position: absolute;
     top: 0;
     left: 50%;
     transform: translate(-50%, -100%);
     width: 2px;
     height: 20px;
     background: var(--black);
 }
 
 .level-3 {
     margin-bottom: 20px;
     background: var(--level-3);
 }
 /* LEVEL-4 STYLES –––––––––––––––––––––––––––––––––––––––––––––––––– */
 
 .level-4-wrapper {
     position: relative;
     width: 80%;
     margin-left: auto;
 }
 
 .level-4-wrapper::before {
     content: "";
     position: absolute;
     top: -20px;
     left: -20px;
     width: 2px;
     height: calc(100% + 20px);
     background: var(--black);
 }
 
 .level-4-wrapper li+li {
     margin-top: 20px;
 }
 
 .level-4 {
     font-weight: normal;
     background: var(--level-4);
 }
 
 .level-4::before {
     content: "";
     position: absolute;
     top: 50%;
     left: 0%;
     transform: translate(-100%, -50%);
     width: 20px;
     height: 2px;
     background: var(--black);
 }
 /* MQ STYLES ––––––––––––––––––––––––––––––––––––––––––––––––– */
 
 @media screen and (max-width: 700px) {
     .rectangle {
         padding: 20px 10px;
     }
     .level-1,
     .level-2 {
         width: 100%;
     }
     .level-1 {
         margin-bottom: 20px;
     }
     .level-1::before,
     .level-2-wrapper>li::before {
         display: none;
     }
     .level-2-wrapper,
     .level-2-wrapper::after,
     .level-2::after {
         display: block;
     }
     .level-2-wrapper {
         width: 90%;
         margin-left: 10%;
     }
     .level-2-wrapper::before {
         left: -20px;
         width: 2px;
         height: calc(100% + 40px);
     }
     .level-2-wrapper>li:not(:first-child) {
         margin-top: 50px;
     }
 }
 /* FOOTER –––––––––––––––––––––––––––––––––––––––––––––––––– */
 
 .page-footer {
     position: fixed;
     right: 0;
     bottom: 20px;
     display: flex;
     align-items: center;
     padding: 5px;
 }
 
 .page-footer a {
     margin-left: 4px;
 }