html {
  box-sizing: border-box;
  overflow-x: hidden;
  scroll-behavior: smooth;
}

*,
*:after,
*:before {
  box-sizing: border-box;
}

body {
  position: relative;
  min-width: 350px;
  font-family: "Manrope", sans-serif;
  font-size: 14px;
  color: #000;
}

body.dark-mode {
  background-color: black;
  color: white;
}

body.dark-mode .course__item .course__item__wrap {
  border: none;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.1);
  transition: box-shadow 0.5s ease transform 0.5s;
}

body.dark-mode .course__item .course__item__wrap:hover {
  border: 1px solid #333;
  transform: scale(1.05);
  box-shadow: 0 0 100px rgba(255, 255, 255, 0.2);
}

@media (width < 768px) {
  body.dark-mode .course__item .course__item__wrap {
    border: none;
    box-shadow: none;
    transform: none;
  }

  body.dark-mode .course__item .course__item__wrap:hover {
    border: none;
    transform: none;
    box-shadow: none;
  }
}

body.dark-mode
  .course__item
  .course__item__wrap
  .course__content
  .course__name
  a {
  color: white;

  &:hover {
    color: #00a651;
  }
}

body.dark-mode .nav {
  position: fixed;
  z-index: 999;
  transition: 0.25s;
  max-width: 1000px;
  background: rgba(0, 0, 0, 0.75);
  border-radius: 12px;
  border: 1px solid #333;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  overflow-x: hidden;

  @media (max-width: 1200px) {
    max-width: 900px;
  }

  @media (max-width: 991px) {
    top: 0;
    max-width: 100%;
    border-radius: 12px;
  }
  @media (max-width: 768px) {
    top: 0;
    max-width: 110%;
    border-radius: 0px;
    margin-left: -10px;
  }
}

body.dark-mode .nav__course {
  list-style: none;
  display: flex;
  flex-flow: row nowrap;
  justify-content: center;
  padding: 0;
  overflow-x: auto;
  overflow-y: hidden;

  @media (max-width: 767px) {
    justify-content: flex-start;
  }

  li {
    position: relative;
    display: flex;
    flex-flow: column;
    align-items: center;
    padding: 0 10px;

    a {
      display: flex;
      flex-flow: column;
      justify-content: center;
      align-items: center;
      width: auto;
      padding: 0 10px;
      text-decoration: none;
      transform: scale(1);
      transition: 0.25s;

      &:hover {
        transform: none;
      }

      span {
        font-size: 12px;
        color: white;
        text-align: center;
        line-height: 1.4;
        white-space: nowrap;
      }

      img {
        width: 40px;
        margin-bottom: 10px;
      }
    }
  }
}

/* Default scrollbar styles */
body::-webkit-scrollbar {
  width: 12px; /* Width of the scrollbar */
}

body::-webkit-scrollbar-thumb {
  background-color: var(
    --scrollbar-thumb-color,
    #ccc
  ); /* Default thumb color */
  border-radius: 6px; /* Rounded corners of the scrollbar thumb */
}

/* Dark mode scrollbar styles */
body.dark-mode::-webkit-scrollbar-thumb {
  background-color: var(
    --scrollbar-thumb-color,
    #333
  ); /* Dark mode thumb color */
}

/* Light mode scrollbar styles */
body.light-mode::-webkit-scrollbar-thumb {
  background-color: var(
    --scrollbar-thumb-color,
    #ccc
  ); /* Light mode thumb color */
}

h1 {
  text-align: center;
  padding: 15px 15px;
}

.nav {
  position: sticky;
  z-index: 999;
  transition: 0.25s;
  max-width: 1000px;
  margin-left: 500px;
  background: rgba(255, 255, 255, 0.75);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  overflow-x: hidden;

  @media (max-width: 1200px) {
    max-width: 900px;
  }
  @media (max-width: 768px) {
    border-radius: 0px;
    margin-left: -10px;
  }

  @media (max-width: 991px) {
    top: 0;
    margin-left: 1px;
    max-width: 100%;
    border-radius: 0;
  }
}

.nav__course {
  list-style: none;
  display: flex;
  flex-flow: row nowrap;
  justify-content: center;
  padding: 0;
  overflow-x: auto;
  overflow-y: hidden;

  @media (max-width: 767px) {
    justify-content: flex-start;
  }

  li {
    position: relative;
    display: flex;
    flex-flow: column;
    align-items: center;
    padding: 0 10px;

    a {
      display: flex;
      flex-flow: column;
      justify-content: center;
      align-items: center;
      width: auto;
      padding: 0 10px;
      text-decoration: none;
      transform: scale(1);
      transition: 0.25s;

      &:hover {
        transform: scale(1.1);
      }

      span {
        font-size: 12px;
        color: #000;
        text-align: center;
        line-height: 1.4;
        white-space: nowrap;
      }

      img {
        width: 40px;
        margin-bottom: 10px;
      }
    }
  }
}

.container {
  margin: 0 auto;
  padding: 0 15px;
  max-width: 1140px;

  @media (max-width: 1200px) {
    max-width: 980px;
  }
}

.section__course {
  position: relative;
  z-index: 10;
  padding: 30px 0 30px 0;

  .course__title {
    position: relative;
    z-index: 3;
    overflow: hidden;
    margin-top: 0;
    padding: 60px 30px;
    font-size: 30px;
    text-align: center;
    color: #fff;
    border-radius: 12px;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;
    transition: 0.25s;

    @media (max-width: 991px) {
      font-size: 26px;
      padding: 45px 30px;
    }

    @media (max-width: 767px) {
      font-size: 16px;
      text-align: center;
      padding: 30px 15px;
    }

    &:before {
      content: "";
      position: absolute;
      z-index: -1;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.2);
      backdrop-filter: blur(3px);
      -webkit-backdrop-filter: blur(5px);
    }
  }

  .course__list {
    display: flex;
    flex-flow: row wrap;
    margin: 0 -15px;
    transition: 0.25s;

    @media (max-width: 991px) {
      margin: 0 -10px;
    }

    .course__item {
      flex: 0 0 25%;
      padding: 15px;
      height: 350px;

      @media (max-width: 991px) {
        flex: 0 0 33.333333%;
        padding: 10px;
      }

      @media (max-width: 767px) {
        flex: 0 0 50%;
        height: 220px;
      }

      .course__item__wrap {
        height: 100%;
        border: none;
        border-radius: 15px;
        overflow: hidden;
        transition: 0.25s;

        &:hover {
          box-shadow: none;
          border: none;
        }
      }

      .course__img {
        display: flex;

        img {
          width: 100%;
          transform: scale(1) rotate(0);
          transition: 0.25s;
        }
      }

      .course__content {
        padding: 0 15px 25px 15px;
        display: flex;
        flex-flow: column;
        align-items: center;
      }

      .course__name {
        margin: 10px 0;
        font-size: 16px;
        font-weight: 500;
        line-height: 1.4;
        text-align: center;

        @media (max-width: 767px) {
          font-size: 14px;
        }

        a {
          text-decoration: none;
          color: #000;
          transition: 0.25s;

          &:hover {
            color: #41b93c;
          }
        }
      }
    }
  }
}

#ece1109 .course__title {
  background-image: url("ece1109.jpg");
}

#eee1109 .course__title {
  background-image: url("eee1109.jpg");
}

#hum1109 .course__title {
  background-image: url("hum1109.jpg");
}

#math1109 .course__title {
  background-image: url("math1109.jpg");
}

#ph1109 .course__title {
  background-image: url("ph1109.jpg");
}

#ece1209 .course__title {
  background-image: url("ece1209.jpg");
}

#ece1205 .course__title {
  background-image: url("ece1205.jpg");
}

#cse1209 .course__title {
  background-image: url("cse1209.jpg");
}

#math1209 .course__title {
  background-image: url("math1209.jpg");
}

#ch1209 .course__title {
  background-image: url("ch1209.jpg");
}

.toggle-password {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  cursor: pointer;
  font-size: 12px;
  color: #00a651;
}

/* Toggle Switch Styles */
.toggle-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: none;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: 0.4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: #00a651;
}

input:checked + .slider:before {
  transform: translateX(26px);
}

#progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: transparent;
  z-index: 9999;
}

#progress-bar {
  height: 4px;
  background-color: #00a651;
  width: 0;
  animation: progressBarAnimation 1s forwards;
}

@keyframes progressBarAnimation {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}