/* Basic Reset & Body Styling for Smoothness */
body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #1a1a1a;
    color: #f0f0f0;
    overflow: hidden; /* Prevent scrollbars initially due to overlay */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh; /* Full viewport height */
    transition: background-color 1s ease-in-out; /* Smooth background transition */
}

/* Intro Overlay Styling */
#intro-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: #000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    z-index: 1000; /* Ensure it's on top */
    color: #fff;
    cursor: pointer;
    transition: opacity 1s ease-out, visibility 1s ease-out;
}

#intro-overlay h1 {
    font-size: 3em;
    margin-bottom: 20px;
    opacity: 0; /* Starts hidden for fade-in effect */
    transform: translateY(20px); /* Starts slightly below for smooth entry */
    animation: fadeInSlideUp 1.5s ease-out forwards;
}

#intro-overlay p {
    font-size: 1.2em;
    opacity: 0; /* Starts hidden for fade-in effect */
    transform: translateY(10px); /* Starts slightly below for smooth entry */
    animation: fadeInSlideUp 1.5s ease-out forwards;
    animation-delay: 1s; /* Delay for this element */
}

/* Keyframe Animations for Intro */
@keyframes fadeInSlideUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Hidden state for elements */
.hidden {
    opacity: 0;
    visibility: hidden;
}

/* Main Content Styling */
#main-content {
    width: 90%;
    max-width: 1000px;
    padding: 20px;
    box-sizing: border-box;
    background-color: #2c2c2c;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
    transition: opacity 1s ease-in, transform 1s ease-in;
    transform: translateY(20px); /* Starts slightly below for smooth entry */
    opacity: 0; /* Will be made visible by JS */
}

#main-content.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Tabs Styling */
.tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
    border-bottom: 2px solid #555;
    padding-bottom: 5px;
}

.tab-button {
    background-color: transparent;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    font-size: 1.1em;
    color: #aaa;
    transition: color 0.3s ease, border-bottom 0.3s ease;
    border-bottom: 3px solid transparent; /* For the active indicator */
    margin: 0 5px;
}

.tab-button:hover {
    color: #fff;
}

.tab-button.active {
    color: #4CAF50; /* Green for active tab */
    border-bottom: 3px solid #4CAF50;
    font-weight: bold;
}

/* Tab Content Styling */
.tab-content {
    display: none; /* Hidden by default */
    padding: 15px;
    background-color: #3a3a3a;
    border-radius: 5px;
    line-height: 1.6;
    opacity: 0; /* For fade transition */
    transform: translateY(10px); /* For slide-up transition */
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;

    /* ADDITIONS FOR SCROLLING */
    max-height: 60vh; /* Adjust this value as needed, e.g., 500px, 70vh */
    overflow-y: auto; /* Adds vertical scrollbar when content overflows */
    scrollbar-width: thin; /* Firefox */
    scrollbar-color: #555 #3a3a3a; /* Firefox thumb and track */
}

/* Webkit scrollbar styling (for Chrome, Safari, Edge) */
.tab-content::-webkit-scrollbar {
    width: 8px;
}

.tab-content::-webkit-scrollbar-track {
    background: #3a3a3a; /* Track color */
    border-radius: 10px;
}

.tab-content::-webkit-scrollbar-thumb {
    background-color: #555; /* Thumb color */
    border-radius: 10px;
    border: 2px solid #3a3a3a; /* Padding around thumb */
}

.tab-content.active {
    display: block; /* Show active content */
    opacity: 1;
    transform: translateY(0);
}

/* Image Styling within Tab Content */
.tab-content img {
    max-width: 100%; /* Ensure images don't overflow their container */
    height: auto; /* Maintain aspect ratio */
    display: block; /* Remove extra space below image */
    margin: 20px auto; /* Center images with some vertical spacing */
    border-radius: 5px; /* Slightly rounded corners for images */
}

/* Responsive Design */
@media (max-width: 768px) {
    #intro-overlay h1 {
        font-size: 2em;
    }

    #intro-overlay p {
        font-size: 1em;
    }

    .tab-button {
        padding: 8px 15px;
        font-size: 0.9em;
    }

    #main-content {
        width: 95%;
        padding: 15px;
    }

    .tab-content {
        max-height: 50vh; /* Adjust max-height for smaller screens if needed */
    }
}

@media (max-width: 480px) {
    .tabs {
        flex-direction: column;
    }

    .tab-button {
        margin: 5px 0;
        width: 100%;
    }
}