/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: #000;
    color: #fff;
    font-family: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    height: 100vh; /* Full viewport height */
    overflow: hidden; /* Disable default body scroll */
}

/* Fixed Title Overlay */
#title-overlay {
    position: fixed;
    top: 30px;
    left: 40px;
    z-index: 100;
    pointer-events: none; /* Allow scrolling underneath */
    mix-blend-mode: difference; /* Ensure visibility on light/dark images */
    font-size: 0.9rem;
    font-weight: 400;
    letter-spacing: -1px; 
    text-transform: uppercase;
}

#info-overlay {
    position: fixed;
    top: 30px;
    right: 40px;
    z-index: 100;
    pointer-events: none;
    mix-blend-mode: difference;
    font-size: 0.9rem;
    font-weight: 400;
    letter-spacing: -1px;
    text-align: right;
    text-transform: uppercase;
}

/* Centered Navigation */
#top-nav {
    position: fixed;
    top: 50px;
    left: 50%;
    transform: translateX(-50%) translateY(10px); /* Centered and slightly down for enter animation */
    z-index: 100;
    opacity: 0;
    transition: opacity 0.5s ease, transform 0.5s ease;
    pointer-events: none; /* Initial state, will be enabled when visible */
}

#top-nav.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto; /* Enable clicks when visible */
}

#nav-links {
    list-style: none;
    display: flex;
    gap: 15px; /* Space between items */
    position: relative;
    padding: 0;
    margin: 0;
}

#nav-links li {
    font-size: 0.9rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: -0.5px;
    color: #fff;
    white-space: nowrap;
    position: relative;
    z-index: 2;
    padding: 6px 12px;
    mix-blend-mode: difference; /* Critical for auto-color inversion on white pill */
    cursor: pointer; /* Clickable cursor */
}

/* The Sliding Pill */
#nav-pill-bg {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background-color: #fff;
    border-radius: 50px;
    z-index: 1; /* Behind text */
    pointer-events: none;
    
    /* Transitions for movement */
    transition: left 0.4s cubic-bezier(0.25, 1, 0.5, 1), width 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    opacity: 0; /* Hidden until first activation */
}

#nav-pill-bg.active {
    opacity: 1;
}

/* Main Slideshow Container */
#slideshow-container {
    height: 100vh;
    overflow-y: scroll; /* Enable vertical scrolling */
    
    /* The "Snap" Magic */
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;

    /* Hide Scrollbars */
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none;  /* IE/Edge */
}

#slideshow-container::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

/* Individual Slide */
.slide {
    height: 100vh;
    width: 100%;
    
    /* Snap Alignment */
    scroll-snap-align: start;
    
    /* Content Centering */
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    background-color: #000;
}

/* Image Styling */
.slide img {
    max-width: 100%;
    max-height: 100vh;
    object-fit: contain; /* Keeps aspect ratio entire image visible */
    display: block;
    opacity: 0;
    transition: opacity 0.8s ease-in-out;
}

/* Fade in effect when image loads */
.slide img.loaded {
    opacity: 1;
}

/* Page Number Indicator */
.page-number {
    position: absolute;
    bottom: 30px;
    right: 40px;
    font-size: 0.9rem;
    font-variant-numeric: tabular-nums;
    opacity: 0.5;
}

/* Mobile Responsive Styles */
@media (max-width: 768px) {
    /* Optimize Navigation: Vertical, Small, Top Right */
    #top-nav {
        left: auto !important;
        right: 20px;
        top: 60px; /* Position below the header/title info */
        transform: none !important; /* Disable centering transform */
    }

    #top-nav.visible {
        transform: none !important;
        opacity: 1;
    }

    #nav-links {
        display: flex;
        flex-direction: column; /* Vertical stack */
        align-items: flex-end; /* Align right */
        gap: 8px; /* Compact spacing */
    }

    #nav-links li {
        font-size: 0.75rem; /* Smaller font */
        padding: 6px 10px; /* Adjust padding */
    }

    /* Adjust pill transition for vertical movement */
    #nav-pill-bg {
        transition: top 0.4s cubic-bezier(0.25, 1, 0.5, 1), height 0.4s cubic-bezier(0.25, 1, 0.5, 1), left 0.4s, width 0.4s;
    }

    /* Move Info Overlay to Bottom Left & Resize Title */
    #info-overlay {
        top: auto;
        bottom: 30px;
        left: 20px;
        right: auto;
        font-size: 0.75rem;
        text-align: left;
    }

    #title-overlay {
        font-size: 0.75rem;
        left: 20px;
    }
}