/* ================================
   Variables for colors
   ================================ */
   :root {
    --main-bg-color: #c1c1c1;
    --secondary-bg-color: #3b5a70;
    --footer-text-color: white;
    --button-bg-color: #bcbebf;
    --button-hover-bg-color: #e8e8e8;
    --card-border-color: #a9aeb2;
    --container-light-color: #b9b9b9;
    --container-dark-color: #2a5e71;
  }
  
  /* ================================
     Global
     ================================ */
  * {
    box-sizing: border-box;
  }
  
  html, body {
    max-width: 100%;
    overflow-x: hidden;
  }
  
  body {
    margin: 0;
    padding: 0;
    width: 100%;
    background: linear-gradient(
      115deg,
      var(--main-bg-color),
      var(--secondary-bg-color)
    );
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
  }
  
  /* ================================
     Links (UPDATED)
     ================================ */
  a {
    color: inherit;
    align-self: center;
    text-decoration: none;
    text-underline-offset: 4px;
    text-decoration-thickness: 1.5px;
  }
  
  a:hover {
    text-decoration: underline;
  }
  
  .button:hover,
  .socials a:hover {
    text-decoration: none;
  }
  
  .gold {
    color: rgb(255, 255, 239);
    padding: 10px;
    margin: 20px;
    text-align: center;
  }
  
  .gold:hover {
    text-decoration-color: rgba(255, 255, 239, 0.9);
  }
  
  /* ================================
     Typography
     ================================ */
  li {
    padding: 10px;
  }
  
  h2 {
    margin: 10px;
    text-align: center;
  }
  
  p {
    margin: 10px;
    padding: 20px;
    text-align: center;
  }
  
  /* ================================
     Layout & Containers
     ================================ */
  .box-content {
    display: flex;
    flex-direction: column;
    transition: all 0.5s ease;
    align-items: center;
  }
  
  .section-box {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 20px;
  }
  
  /* ================================
     Title Section
     ================================ */
  .title {
    font-size: 5em;
    transition: all 4.5s ease;
  }
  
  .title-box {
    position: relative;
    width: 90%;
    max-width: 800px;
    height: 40vh;
    padding: 20px;
    margin: 10vh auto;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 80px;
    transition: all 4.5s ease;
    border: 1px solid #b6b6b6;
  }
  
  .title-box:hover {
    border: 10px solid #ececec;
    filter: drop-shadow(0 0 20px #d6d6d6);
    border-radius: 110px;
  }
  
  .title-box:hover .title {
    color: #ececec;
  }
  
  /* ================================
     Cards
     ================================ */
  .card {
    position: relative;
    width: 90%;
    max-width: 500px;
    height: 250px;
    padding: 55px;
    margin: 20px auto;
    border-radius: 50px;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    align-items: center;
    transition: all 0.5s ease;
    word-wrap: break-word;
    overflow-wrap: break-word;
  }
  
  .card:hover {
    border: 3px solid #d0d0d0;
    border-radius: 80px;
    width: 95%;
    max-width: 550px;
    height: 300px;
    filter: drop-shadow(0 0 20px #dadada);
  }
  
  .card:hover .box-content {
    color: #d8dce2;
  }
  
  .card.active {
    width: 95%;
    max-width: 60vw;
    height: 60vh;
    font-size: 1.2em;
    border-radius: 80px;
    filter: drop-shadow(0 0 20px #c9c9c9);
  }
  
  /* ================================
     Card Content
     ================================ */
  .extra-text {
    text-align: center;
    display: none;
    margin-top: 10px;
  }
  
  .card.active .extra-text {
    display: block;
  }
  
  /* ================================
     Buttons
     ================================ */
  .button {
    background-color: var(--button-bg-color);
    color: #373434;
    border: solid 1px rgb(227, 225, 225);
    padding: 10px 20px;
    margin: 5px;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.3s;
  }
  
  .button:hover {
    background-color: var(--button-hover-bg-color);
  }
  
  .button.home {
    position: fixed;
    top: 10px;
    right: 10px;
  }
  
  /* ================================
     Social Icons
     ================================ */
  .socials {
    display: flex;
    gap: 16px;
    margin-top: 18px;
    align-items: center;
  }
  
  .socials a {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: rgba(255, 215, 0, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    transition:
      transform 0.25s ease,
      box-shadow 0.25s ease,
      background 0.25s ease;
  }
  
  .socials a img {
    width: 22px;
    height: 22px;
    filter: brightness(0.9);
    transition: filter 0.25s ease;
  }
  
  .socials a:hover {
    transform: translateY(-4px) scale(1.05);
    background: rgba(255, 215, 0, 0.18);
    box-shadow: 0 10px 25px rgba(255, 215, 0, 0.25);
  }
  
  .socials a:hover img {
    filter: brightness(1.2);
  }
  
  /* ================================
     Math Content
     ================================ */
  .math-content {
    width: 100%;
    text-align: center;
    font-size: 1.1em;
    line-height: 1.6;
    margin: 0;
    padding: 10px;
    word-wrap: break-word;
  }
  
  /* ================================
     Footer
     ================================ */
  footer {
    color: var(--footer-text-color);
    text-align: center;
    padding: 10px;
    width: 100%;
  }
  
  /* ================================
     Motion
     ================================ */
  @keyframes hover-lightly {
    0% { transform: translateX(0); }
    50% { transform: translateX(10vw); }
    100% { transform: translateX(-10vw); }
  }
  
  /* ================================
   Papers section refinements
   ================================ */

.papers-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.paper-item {
  line-height: 1.55;
}

.paper-title {
  font-weight: 600;
  letter-spacing: 0.01em;
}

.paper-meta {
  opacity: 0.85;
  font-size: 0.95rem;
}

.paper-links {
  margin-top: 0.3rem;
  font-size: 0.95rem;
}

  /* ================================
     Responsive (Mobile)
     ================================ */
  @media screen and (max-width: 768px) {
  
    .title-box {
      width: 95%;
      height: auto;
      min-height: 25vh;
      padding: 20px;
      border-radius: 32px;
      margin: 6vh auto;
    }
  
    .title {
      font-size: 2.8em;
    }
  
    .section-box {
      padding: 10px;
      gap: 20px;
    }
  
    .card {
      width: 95%;
      max-width: 420px;
      height: auto;
      padding: 28px;
      border-radius: 28px;
      transition: none;
    }
  
    .card:hover {
      width: 95%;
      max-width: 420px;
      height: auto;
      border-radius: 28px;
      filter: none;
    }
  
    .card.active {
      width: 95%;
      max-width: 95%;
      height: auto;
      font-size: 1.05em;
      border-radius: 32px;
    }
  
    p {
      padding: 12px;
      font-size: 0.95em;
    }
  
    h2 {
      font-size: 1.2em;
    }
  
    .socials {
      justify-content: center;
      gap: 14px;
      margin-top: 14px;
    }
  
    .socials a {
      width: 38px;
      height: 38px;
      border-radius: 10px;
    }
  
    .socials a img {
      width: 20px;
      height: 20px;
    }
  
    .button {
      font-size: 0.85em;
      padding: 8px 14px;
    }
  
    @keyframes hover-lightly {
      0%, 100% {
        transform: translateX(0);
      }
    }
  }