/* Basic Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}


/* Updated Body Styles */
body {
    background: linear-gradient(to bottom, #1a1a1a, #000); /* Fallback for unsupported browsers */
    color: #dfe;
    font-size: 0.95rem;
    font-family: "Poppins", sans-serif;
    font-weight: bold;
    overflow-x: hidden;
    margin: 0;
    padding: 0;
}
    /* Container to center the main content */
    .bibliography-container {
      width: 100%;
      min-height: 50vh;
      position: relative;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      padding-bottom: 80px; /* Extra space at bottom if needed */
    }

    /* === TOP-LEFT BOOK ICON === */
    .icon-container {
      position: fixed;
      top: 13px;
      left: 20px;
      z-index: 1000;
    }
    .icon-container i {
      font-size: 2.5rem;
      color: #7ec8e3;
      text-shadow: 0 0 6px #7ec8e3;
    }

    /* === PRESENTATION SECTION (Hero-like) === */
    .presentation-container {
      max-width: 900px;
      margin: 5rem auto;
      text-align: center;
    }

    .presentation-container .h2 {
    font-size: 1.3rem;
}
    /* Title in the hero section */
    .presentation-title {
      font-size: 2.2rem;
      color: #7ec8e3;
      margin-bottom: 20px;
    }

    /* Subtitle text */
    .presentation-subtitle {
      font-size: 1rem;
      line-height: 1.5;
      margin-bottom: 15px;
    }

    .presentation-details {
      font-size: 0.95rem;
      line-height: 1.6;
      margin-bottom: 15px;
    }

    .presentation-details2 {
      font-size: 1rem;
      font-style: bold;
      margin-bottom: 25px;
    }
    .presentation-details4 {
      font-size: 1.1rem;
      font-style: bold;
    }

    /* OPTIONAL: highlight pseudo-class */
    highlight {
      color: #7ec8e3;
      background-color: #333;
      padding: 2px 5px;
      border-radius: 4px;
    }

    /* === BIBLIOGRAPHY INTRO SECTION === */
    .bibliography-intro {
      max-width: 900px;
      margin: 0 auto 40px auto;
      text-align: center;
      padding: 20px;
      background-color: #2e2e2e;
      border-radius: 8px;
      box-shadow:
        inset 0 0 15px rgba(126,200,227,0.2),
        0 0 15px rgba(126,200,227,0.2);
    }
    .bibliography-intro h2 {
      color: #7ec8e3;
      margin-bottom: 15px;
      font-size: 1.6rem;
    }
    .bibliography-intro p {
      line-height: 1.5;
      font-size: 0.95rem;
      margin-bottom: 10px;
      margin-top: 1.53rem;
    }


/* === ACTUAL BIBLIOGRAPHY LIST WRAPPER === */

.scrolling-list {
    width: 70%;
    max-width: 900px;
    height: 60vh;
    background-color: #2e2e2e;
    border-radius: 8px;
    box-shadow: inset 0 0 15px rgba(126, 200, 227, 0.2), 0 0 15px rgba(126, 200, 227, 0.2);
    position: relative;
    -webkit-overflow-scrolling: touch; /* Add this line */
    overflow: scroll;
    overflow-y: scroll;

}

/* Custom scrollbar styling */
.scrolling-list::-webkit-scrollbar {
    width: 0px;
}

.scrolling-list::-webkit-scrollbar-thumb {
    background: rgba(126, 200, 227, 0.5); /* Semi-transparent blue */
    border-radius: 6px;
    border: 2px solid #2e2e2e; /* Matches background for a smooth look */
}

.scrolling-list::-webkit-scrollbar-thumb:hover {
    background: rgba(126, 200, 227, 0.8); /* Slightly darker on hover */
}

.scrolling-list::-webkit-scrollbar-track {
    background: transparent; /* Fully transparent */
}

.scrolling-list:hover::-webkit-scrollbar {
    width: 12px;
    opacity: 1;
    transition: opacity 0.3s ease-in-out;
}

.scrolling-list:not(:hover)::-webkit-scrollbar {
    opacity: 1; /* Invisible when not interacting */
    transition: opacity 0.3s ease-in-out;
}


    .reference-item {
      position: relative;
      padding: 10px;
      line-height: 1.3;
      text-align: center;
      transition: background-color 0.3s;
    }
    .reference-item:hover {
      background-color: #3b3b3b;
    }

/* Gradient line between items */
.reference-item::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, #5aaac8, #7ec8e3, #a8e1f2);
    border-radius: 2px;
    box-shadow: 0 0 10px rgba(126, 200, 227, 0.8), 0 0 20px rgba(126, 200, 227, 0.5);
    overflow: hidden;
    /* animation: pulseLine 6s ease-in-out infinite, shimmerEffect 6s linear infinite; */
}

/* Subtle glow effect to make it alive */
@keyframes pulseLine {
    0%, 100% {
        transform: scaleX(0.8);
        opacity: 0.8;
    }
    50% {
        transform: scaleX(1); /* Slightly stretch the line */
        opacity: 1;
    }
}

/* Shimmer movement across the line */
@keyframes shimmerEffect {
    0% {
        background-position: -150% 0;
    }
    100% {
        background-position: 150% 0;
    }
}


    .reference-item a {
      color: #7ec8e3;
      text-decoration: none;
      transition: color 0.3s ease;
    }
    .reference-item a:hover {
      color: #a8e1f2;
      text-decoration: underline;
    }
/* === SUMMARY POPUP === */
.summary-popup {
    position: absolute;
    top: 0;
    left: 0;
    background-color: rgba(34, 34, 34, 0.95);
    color: #a8e1f2;
    border: 1px solid #7ec8e3;
    border-radius: 8px;
    padding: 20px;
    display: none;
    z-index: 80;
    width: 570px;
    height: 300px; /* Increased height for image and text */
    box-shadow: 0 0 10px #7ec8e3, 0 0 20px rgba(126, 200, 227, 0.3);
    transform: scale(0.8);
    transition: transform 0.2s ease-in-out, opacity 0.2s ease-in-out;
    opacity: 0;
    display: flex; /* Flexbox for layout */
    flex-direction: row; /* Image on left, text on right */
    gap: 20px; /* Space between image and text */
}

/* Popup visible state */
.summary-popup.show {
    display: flex;
    transform: scale(1);
    opacity: 1;
}

/* Book image styling */
.summary-popup img {
    width: 40%; /* Adjust size as needed */
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
}

/* Text container styling */
.summary-popup .text-content {
    flex: 1;
    overflow: hidden;
    font-size: 0.8rem;
    line-height: 1.3;
    white-space: pre-wrap; /* Preserve whitespace for typing effect */
}


    hr {
    border: none;
    height: 1px;
    background: #add8e6;
    opacity: 0.5;
    margin: 20px 0;
}

    .nav-center {
    margin-right: 1.84rem;

}




/* Footer Video Styling */

/* Modern video container styling */
.video-container {
    position: relative;
    width: 80%;
    max-width: 900px;
    margin: 50px auto;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.8), rgba(126, 200, 227, 0.5));
    opacity: 0; /* Hidden initially for fade-in effect */
    transform: translateY(50px); /* Initial offset for animation */
    transition: opacity 1.5s ease-in-out, transform 1.5s ease-in-out;
}

/* Video styling */
.video-content {
    width: 100%;
    height: auto;
    display: block;
    filter: brightness(0.8); /* Slight darkening effect for modern look */
    transition: filter 0.3s ease-in-out;
    pointer-events: auto; /* Ensure interaction */
    touch-action: manipulation; /* Prevent default touch behaviors like full-screen */
}

/* Hover effect on video */
.video-content:hover {
    filter: brightness(1); /* Brighten on hover */
}

/* Gradient edges around the video */
.video-container::before,
.video-container::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    pointer-events: none;
    z-index: 2;
    border-radius: 15px;
    background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.5));
}

/* Overlay for enabling sound */
.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 1rem;
    font-weight: bold;
    text-transform: uppercase;
    cursor: pointer;
    z-index: 3; /* Ensure it overlays the video */
    opacity: 1;
    transition: opacity 0.3s ease-in-out;
}

.video-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}


/* Redirect message styling */
.redirect-message {
    position: fixed;
    bottom: 57px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 0.9rem;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: opacity 0.3s ease-in-out;
    z-index: 9999;
}

/* Mute/Unmute Icon Styling */
.mute-icon {
    position: absolute;
    top: 15px; /* Position it in the top-left corner */
    left: 15px;
    background-color: rgba(0, 0, 0, 0.7); /* Semi-transparent black background */
    border-radius: 50%; /* Circle icon */
    padding: 10px;
    cursor: pointer;
    z-index: 10; /* Ensure it overlays the video */
    box-shadow: 0 0 15px rgba(126, 200, 227, 0.5), 0 0 30px rgba(126, 200, 227, 0.3);
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

/* Icon Inside */
.mute-icon i {
    font-size: 1.5rem;
    color: #7ec8e3; /* Light blue */
}

/* Hover Effect */
.mute-icon:hover {
    transform: scale(1.1); /* Slight zoom effect */
    box-shadow: 0 0 20px rgba(126, 200, 227, 0.8), 0 0 40px rgba(126, 200, 227, 0.6);
}



.hover-info {
  font-size: 0.855rem;
  position: relative;
  left: 17.5%;
  margin-bottom: 5px;
  display: flex;
  align-items: center;
  color: white;
  padding: 5px 10px;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
  transition: opacity 0.3s ease, transform 0.2s ease;
}


.small-icon {
    width: 18px; /* Adjust the size as needed */
    height: 18px;
}


 /************************************************************
 * Media Query for Mobile Devices
 ************************************************************/

@media only screen and (max-width: 768px) {
      .icon-container i {
        margin-top: 2.3rem;
    }

    .scrolling-list {
    width: 92%;
    }

    .summary-popup {
    width: 245px;

    }

    /* Book image styling */
.summary-popup img {
    width: 40%; /* Adjust size as needed */
    }

    #loginBtn {
    display: none;
    pointer-events: none;

    }


/* Text container styling */
.summary-popup .text-content {
    font-size: 0.7rem;
    line-height: 1.1;
}

        p {
        margin: 0.3rem 1rem;
    }


.small-icon {
    width: 16px; /* Adjust the size as needed */
    height: 16px;
}

}