* {
    box-sizing: border-box;
}

body {
    background: linear-gradient(to right, #f0f4f8, #d9e7ff, #b0e0e6);
    height: 100%;
    font-family: Arial, sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
}

.navbar {
    background: linear-gradient(to right, var(--bs-cyan), #121212);
}

.jumbotron {
    position: relative;
    color: white;
    padding: 2rem 1.5rem;
    border-radius: 15px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 100%;
    margin: 20px auto;
    z-index: 1;
    overflow: hidden;
    animation: gradientBackground 15s ease infinite;
}

.jumbotron h3, .jumbotron p {
    position: relative;
    z-index: 2;
}

.iframe-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.9;
    pointer-events: none;
}

.iframe-container iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.card-header {
    background: linear-gradient(135deg, #9ec7ef, #007bff);
    color: #fff;
    font-weight: bold;
    padding: 15px;
    text-align: center;
    font-size: 1.25em;
    border-radius: 10px;
}

.feature {
    text-align: center;
    animation: fadeIn 2s ease-in-out;
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
} 

.feature:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    color: #000;
    background-color: #fff;
}

footer {
    position: relative;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes gradientBackground {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

@media (max-width: 768px) {
    .features .row {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .features .col-md-4 {
        width: 90%;
        margin-bottom: 40px;
    }
}

@media (max-width: 768px) {
    .team {
        flex-direction: column;
        align-items: center;
    }

    .team .col-md-4 {
        width: 100%;
        margin-bottom: 25px;
    }

    .point__img {
        width: 100%;
        height: auto;
    }
}

@media (max-width: 768px) {
    .demonstration .row {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .demonstration .col-md-6 {
        width: 90%;
        margin-bottom: 20px;
    }
}

.cards {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;

  .card {
    height: 440px;
    background: #fff;
    border-radius: 4px;
    box-shadow: 0px 20px 30px -10px rgba(0, 0, 0, 0.1);
    max-width: 300px;
    min-width: 260px;
    overflow: hidden;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-direction: column;
    position: relative;
    transition: all 0.4s ease;
    margin: 0 10px;

    &:before {
      height: 190px;
      width: calc(100% + 100px);
      content: "";
      position: absolute;
      background-image: linear-gradient(to top, #4481eb 0%, #04befe 100%);
      border-radius: 4px 4px 100% 100%;
      transition: all 0.4s ease-out;
      top: 0;
    }
    
    .close {
      width: 18px;
      height: 18px;
      position: absolute;
      z-index: 2;
      cursor: pointer;
      background-image: url("https://rafaelalvucas.github.io/assets/icons/misc/cross.svg");
      background-size: 80%;
      background-repeat: no-repeat;
      background-position: center;
      top: 0;
      right: 0;
      margin: 10px;
      padding: 5px;
      transition: all 0.2s ease;

      &:hover {
        background-size: 100%;
        opacity: 0.8;
      }
    }

    .arrow {
      display: none;
    }

    article {
      z-index: 1;
      display: flex;
      align-items: center;
      flex-direction: column;
      text-align: center;

      h2 {
        font-family: 'Roboto Mono';
        color: white;
        margin: 0;
        padding: 40px 20px 10px 20px;
        font-weight: 700;
        font-size: 20px;
        letter-spacing: 0.5px;
      }
      
      .title {
        color: white;
        padding: 10px 20px;
        letter-spacing: 0.8px;
        transition: all 0.4s ease;
      }

      .desc {
        padding: 10px 30px;
        font-size: 14px;
        text-align: center;
        line-height: 24px;
        color: #666;
        height: 90px;
        transition: all 0.4s ease-out;
      }

      .pic {
        width: 120px;
        height: 120px;
        overflow: hidden;
        border-radius: 100%;
        margin: 20px 0;
        box-shadow: 0px 0px 0px 0px rgba(255, 255, 255, 0.3);
        transition: all 0.6s ease;

        img {
          width: 100%;
          -webkit-filter: grayscale(100%);
          filter: grayscale(100%);
        }
      }
    }
    .actions {
      width: 100%;
      display: flex;
      justify-content: space-between;
      background: white;
      z-index: 1;

      .btn {
        border: 0;
        background-color: transparent;
        box-sizing: border-box;
        width: calc(50% - 1px);
        height: 36px;
        margin: 0;
        text-transform: uppercase;
        font-size: 10px;
        transition: all 0.6s ease-in-out;
        cursor: pointer;
        color: #4481eb;
        position: relative;
        display: flex;
        justify-content: center;
        align-items: center;
        font-weight: 500;
        letter-spacing: 0.5px;
        background: rgba(68, 129, 235, 0.08);

        span {
          z-index: 1;
          opacity: 1;
          transition: all 0.4s ease-in-out;
        }

        .icon {
          width: 10px;
          opacity: 0;
          position: absolute;
          transition: all 0.2s ease-in-out;
        }

        &:before {
          content: "";
          width: 100%;
          height: 0%;
          position: absolute;
          background: #4481eb;
          transition: all 0.4s ease;
          bottom: 0;
          opacity: 0.2;
        }

        &:focus {
          outline: 0;
        }

        &:hover {
          background-color: rgba(255, 255, 255, 0.5);

          span {
            opacity: 0;
            transition: all 0.3s ease-in-out;
          }

          .icon {
            width: 22px;
            opacity: 1;
            transition: all 0.4s ease-in-out;
          }

          &:nth-child(3) {
            .icon {
              width: 18px;
            }
          }
          &:before {
            height: 100%;
          }
        }
        
        &.clicked {
          
          span {
            display: none;
          }
          .icon {
            width: 22px;
            opacity: 1;
            animation: icon 0.5s ease forwards;
            
            @keyframes icon {
              0%{
                width: 22px;
              }
              50%{
                width: 40px;
              }
              100%{
                width: 22px;
              }
            }
          }
          &:before {
            opacity: 0.3;
            height: 100%;
          }
        }
      }
    }

    &:hover {
      transform: translateY(-10px);
      box-shadow: 0px 5px 10px -5px rgba(0, 0, 0, 0.3);

      &:before {
        height: 100%;
        border-radius: 4px;
      }

      .desc {
        color: white;
      }
      
      .pic {
        box-shadow: 0px 0px 0px 8px rgba(255, 255, 255, 0.3);
        img {
          -webkit-filter: grayscale(0%);
          filter: grayscale(0%);
        }
      }
    }

    &.closed {
      min-width: 120px;
      max-width: 120px;
      display: flex;
      justify-content: center;
      align-items: center;
      transition: all 0.6s ease;
      cursor: pointer;

      .title,
      .desc,
      .actions,
      .close {
        display: none;
      }

      h2 {
        padding: 0;
        height: 100%;
        transform: rotate(-90deg);
        width: 440px;
        z-index: 2;
        transition: all 0.6s ease;
      }

      .pic {
        border-radius: 100%;
        height: 400px;
        width: 400px;
        position: absolute;
        top: -20px;
        margin: 0;
        box-shadow: 0;
        transition: all 0.6s ease;

        img {
          object-fit: cover;
          height: 100%;
          transform: translateY(20px);
        }

        &:before {
          content: "";
          position: absolute;
          width: 100%;
          height: 100%;
          background-color: black;
          opacity: 0.5;
          z-index: 1;
          transition: all 0.4s ease;
          transform: translateY(20px);
        }
      }

      &:before {
        height: 100%;
        border-radius: 4px;
      }

      .arrow {
        width: 18px;
        height: 18px;
        position: absolute;
        z-index: 2;
        cursor: pointer;
        bottom: 15px;
        padding: 5px;
        display: flex;
        justify-content: center;
        background-image: url("https://rafaelavlucas.github.io/assets/icons/misc/expand.svg");
        background-size: 80%;
        background-repeat: no-repeat;
        background-position: center;
        transition: all 0.2s ease;
      }

      &:hover {
        .arrow {
          background-size: 100%;
          opacity: 0.6;
        }
      }
    }
  }
}

@media (max-width: 768px) {
  .cards {
    flex-direction: column;
    align-items: center;
  }

  .card {
    max-width: 80%;
    min-width: 260px;
    margin-bottom: 20px;
  }

  .card .pic {
    width: 100px;
    height: 100px;
  }

  .card .desc {
    font-size: 14px;
    padding: 0 15px;
  }

  .card .actions {
    flex-direction: column;
  }

  .card .btn {
    width: 100%;
    margin-bottom: 10px;
  }
}

@media (max-width: 480px) {
  .cards {
    width: 100%;
  }

  .card {
    max-width: 100%;
    min-width: 100%;
    height: auto;
    margin-bottom: 20px;
  }

  .card article h2 {
    font-size: 18px;
  }

  .card .pic {
    width: 80px;
    height: 80px;
  }

  .card .desc {
    font-size: 12px;
    padding: 0 10px;
    line-height: 20px;
  }

  .card .actions .btn {
    font-size: 10px;
    height: 30px;
  }

  .card .actions {
    flex-direction: column;
  }

  .card .btn {
    width: 100%;
    margin-bottom: 10px;
  }
}

@media (min-width: 1024px) {
  .cards {
    justify-content: space-between;
  }

  .card {
    max-width: 30%;
  }
}