:root {
    --color-gray-light-1: #f8f8f8;
    --color-gray-light-2: #e9e9e9;
    --color-gray-light-3: #dedede;
    --color-gray-dark-1: #545454;
    --color-gray-dark-2: #737373;
    --color-gray-dark-3: #9a9a9a;
    --color-blue-dark-1: #00387f;
    --color-orange: #ffba3a;
    --profile-theme: #ffab10;
    --timeline-circle-theme: #14253e;
  
    --pgbar-length: 100%;
  
    --MATH-PI: 3.1415px;
    --percent: 100;
  }
  
  html {
    font-size: 100%;
    font-family: "PT Sans", sans-serif;
  }
  
  * {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
    padding: 3rem 1rem;
    min-height: 100vh;
    background-color: var(--color-gray-light-3);
  }
  
  .wrapper {
    margin: 0 auto;
    max-width: 70rem;
    background-color: var(--color-gray-light-2);
    display: flex;
    box-shadow: 0px 0px 15px 4px #b3b3b3;
  }
  
  .intro {
    flex: 0 0 350px;
    background-color: var(--color-gray-light-1);
    box-shadow: 5px 0px 15px 0px #b3b3b3;
    z-index: 5;
  }
  .profile {
    position: relative;
    background-color: var(--profile-theme);
    padding: 2rem 1rem;
    margin-bottom: 50px;
    text-align: center;
    user-select: none;
  }
  .profile::after {
    content: " ";
    position: absolute;
    left: 0;
    bottom: -15px;
    width: 100%;
    height: 30px;
    background-color: var(--profile-theme);
    transform: skewY(-5deg);
  }
  .photo img {
    width: 80%;
    border-radius: 50%;
  }
  .bio .name {
    font-size: 1.5rem;
    text-align: center;
    color: var(--color-gray-light-1);
    margin: 0;
    margin-top: 1rem;
  }
  .bio .profession {
    font-size: 1rem;
    text-align: center;
    color: var(--color-gray-light-1);
    margin: 0;
  }
  
  .intro-section {
    padding: 0 1rem;
    color: var(--color-gray-dark-1);
  }
  .intro-section .title {
    font-size: 1rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
  }
  .about .paragraph {
    text-align: justify;
  }
  .info-section {
    margin: 1rem 0;
  }
  .info-section span {
    position: relative;
    transition: all 0.3s;
  }
  .info-section i {
    color: var(--profile-theme);
    width: 20px;
    height: 20px;
  }
  
  .link a {
    text-decoration: none;
    color: inherit;
  }
  
  .link span::after {
    position: absolute;
    content: "";
    left: 50%;
    bottom: -3px;
    width: 0;
    height: 2px;
    background-color: var(--profile-theme);
    transition: width 0.3s;
    /*transition-timing-function: cubic-bezier(.64,.51,.16,.86);*/
    transition-timing-function: cubic-bezier(0.92, 0.57, 0.33, 1.02);
    transform: translate(-50%, 0);
  }
  
  .link span:hover {
    color: var(--profile-theme);
  }
  .link span:hover::after {
    width: 100%;
  }
  
  /* Detail section overall setting*/
  .detail {
    flex: 1 0 0;
    background-color: white;
    padding: 2rem;
  }
  .detail:hover > .detail-section:not(:hover) {
    opacity: 0.3;
  }
  .detail-section {
    transition: all 0.3s;
  }
  .detail-section:not(:last-of-type) {
    padding-bottom: 1rem;
  }
  .detail-title {
    display: flex;
    align-items: center;
  }
  .detail-section > .detail-content {
    padding: 1.5rem;
    padding-left: 2rem;
    user-select: none;
  }
  .detail-section.edu > .detail-content {
    padding-left: calc(1.5rem + 10px);
  }
  .title-icon + span {
    font-size: 1.5rem;
    transition: all 0.3s;
  }
  .title-icon {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    margin-right: 1rem;
    width: 2.5rem;
    height: 2.5rem;
    background-color: var(--profile-theme);
    border-radius: 50%;
    transition: all 0.3s;
  }
  .title-icon i {
    color: white;
    line-height: 1rem;
    font-size: 1rem;
    text-align: center;
  }
  .detail-section:hover .title-icon {
    transform: scale(1.5);
    margin-right: 1.5rem;
  }
  .detail-section:hover .title-icon + span {
    letter-spacing: 1.5px;
  }
  
  /* time line block in education section */
  .timeline-block {
    position: relative;
    padding-left: 30px;
  }
  .timeline-block:not(:last-of-type) {
    margin-bottom: 1rem;
  }
  .timeline-block h1 {
    font-size: 1rem;
    margin: 5px 0;
    transition: all 0.3s;
  }
  .timeline-block p {
    font-size: 0.8rem;
    margin: 5px 0;
  }
  .timeline-block time {
    font-size: 0.8rem;
    color: var(--color-gray-dark-2);
  }
  .timeline-block::before {
    position: absolute;
    content: "";
    width: 15px;
    height: 15px;
    background-color: white;
    border: 3px solid var(--timeline-circle-theme);
    border-radius: 50%;
    left: -10px;
    top: -5px;
  }
  .timeline-block::after {
    position: absolute;
    content: "";
    width: 3px;
    height: 100%;
    background-color: var(--timeline-circle-theme);
    left: -1px;
    top: 13px;
  }
  .timeline-block:hover h1 {
    color: var(--color-tiffany);
  }
  .timeline-block:hover::before {
    animation: circle 1.2s infinite;
  }
  
  /* Programming skills section */
  .pg-list,
  .tool-list,
  .favor-list {
    padding: 0;
    list-style: none;
  }
  .pg-list > li {
    margin: 1rem 0;
    display: flex;
    align-items: center;
  }
  .sb-skeleton {
    position: relative;
    flex: 1 0 auto;
    height: 2px;
    background-color: var(--color-gray-dark-3);
  }
  .pg-list > li > span {
    flex: 0 0 100px;
  }
  .sb-skeleton > .skillbar {
    position: absolute;
    left: 0;
    top: -1px;
    width: var(--pgbar-length);
    height: 4px;
    background-color: var(--profile-theme);
  }
  .tool-list {
    list-style: none;
    display: flex;
    justify-content: space-between;
  }
  .tool-list > li {
    position: relative;
    text-align: center;
    flex: 0 0 25%;
  }
  .tool-list > li > svg {
    position: relative;
    fill: transparent;
    width: 95%;
    transform: rotate(-90deg);
  }
  .tool-list > li > svg > circle {
    stroke-width: 1px;
    stroke: #cdcdcd;
  }
  .tool-list > li > svg > circle.cbar {
    stroke-width: 3px;
    stroke: var(--profile-theme);
    stroke-linecap: round;
    stroke-dashoffset: 0;
    stroke-dasharray: calc(var(--MATH-PI) * 45 * 2);
    transition: all 0.8s;
    transition-timing-function: cubic-bezier(0.64, 0.51, 0.16, 0.86);
  }
  .tool-list > li:hover > svg > circle.cbar {
    stroke-width: 4px;
    stroke: var(--color-tiffany);
    stroke-dashoffset: calc(var(--MATH-PI) * 45 * 2 * (1 - var(--percent)));
  }
  .tool-list > li > .tl-name,
  .tool-list > li > .tl-exp {
    position: absolute;
    left: 50%;
    color: var(--color-gray-dark-1);
  }
  .tool-list > li > .tl-name {
    top: 50%;
    font-size: 1.2rem;
    transform: translate(-50%, -50%);
  }
  .tool-list > li > .tl-exp {
    top: calc(50% + 1.4rem);
    font-size: 1rem;
    transform: translate(-50%, -50%);
  }
  /* Interests Section */
  .outer-frame {
    border: 1px solid var(--color-gray-dark-3);
    border-radius: 5px;
  }
  .favor-list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    align-content: center;
  }
  .favor-list > li {
    display: flex;
    flex: 1 0 0;
    align-items: center;
    justify-content: baseline;
    flex-direction: column;
    color: var(--profile-theme);
    padding: 1rem 0;
    transition: all 0.3s;
  }
  .favor-list > li > i {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    font-size: 40px;
    width: 50px;
    height: 50px;
  }
  .favor-list > li:hover {
    transform: scale(1.2);
    color: var(--color-tiffany);
  }
  .favor-list > li > span {
    letter-spacing: 1px;
  }
  
  @keyframes circle {
    0% {
      box-shadow: 0 0 0 0px rgba(51, 52, 57, 1);
    }
    100% {
      box-shadow: 0 0 0 6px rgba(51, 52, 57, 0);
    }
  }
  
  @media (max-width: 1024px) {
    html {
      font-size: 90%;
    }
    .wrapper {
      flex-direction: column;
    }
    .intro,
    .detail {
      flex: 0 0 100%;
      box-shadow: none;
    }
    .intro-section {
      padding: 0 2rem;
    }
    .profile {
      margin-bottom: 1rem;
    }
    .profile::after {
      display: none;
    }
    .photo img {
      width: 100px;
      height: 100px;
    }
  }
  
  @media (max-width: 768px) {
    html {
      font-size: 80%;
    }
    .tool-list {
      flex-wrap: wrap;
    }
    .tool-list > li {
      flex: 0 0 33.33%;
    }
    .favor-list > li {
      flex: 0 0 33.3333%;
    }
  }
  @media (max-width: 500px) {
    html {
      font-size: 70%;
    }
  }