/* =============================================
   RESET & BASE
   ============================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: #ffffff;
    color: #000;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    height: 100vh;
    overflow: hidden;
}

/* =============================================
   FIXED OVERLAYS (Title / Info)
   ============================================= */
#title-overlay {
    position: fixed;
    top: 30px;
    left: 40px;
    z-index: 100;
    pointer-events: none;
    font-size: 0.9rem;
    font-weight: 400;
    letter-spacing: -0.5px;
    text-transform: uppercase;
    color: #000;
    opacity: 0;
    animation: fadeInOverlay 0.8s ease 0.3s forwards;
}

#info-overlay {
    position: fixed;
    top: 30px;
    right: 40px;
    z-index: 100;
    pointer-events: none;
    font-size: 0.9rem;
    font-weight: 400;
    letter-spacing: -0.5px;
    text-align: right;
    text-transform: uppercase;
    color: #000;
    opacity: 0;
    animation: fadeInOverlay 0.8s ease 0.3s forwards;
}

@keyframes fadeInOverlay {
    to { opacity: 1; }
}

/* =============================================
   TOP NAVIGATION
   ============================================= */
#top-nav {
    position: fixed;
    top: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    z-index: 100;
    opacity: 0;
    transition: opacity 0.5s ease, transform 0.5s ease;
    pointer-events: none;
}

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

/* nav-links: horizontal flex row */
#nav-links {
    list-style: none;
    display: flex;
    gap: 4px;
    position: relative;
    padding: 0;
    margin: 0;
}

#nav-links li {
    font-size: 0.6rem;
    font-weight: 400;
    text-transform: none;
    letter-spacing: 0.2px;
    color: #000;
    white-space: nowrap;
    position: relative;
    z-index: 2;
    padding: 4px 8px;
    cursor: pointer;
    transition: opacity 0.2s ease;
}

#nav-links li:hover {
    opacity: 0.5;
}

/* ---- Sliding Pill ---- */
#nav-pill-bg {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background-color: #000;
    border-radius: 50px;
    z-index: 1;
    pointer-events: none;
    transition: left 0.4s cubic-bezier(0.25, 1, 0.5, 1),
                width 0.4s cubic-bezier(0.25, 1, 0.5, 1),
                opacity 0.3s ease;
    opacity: 0;
}

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

/* When pill is active, the text on it should be white for contrast */
#nav-links li.active-section {
    color: #fff;
}

/* When pill is explicitly suppressed */
#nav-pill-bg.suppressed {
    opacity: 0 !important;
    pointer-events: none;
}

/* =============================================
   SLIDESHOW CONTAINER
   ============================================= */
#slideshow-container {
    height: 100vh;
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
    scrollbar-width: none;       /* Firefox */
    -ms-overflow-style: none;    /* IE / Edge */
}

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

/* =============================================
   INDIVIDUAL SLIDE
   ============================================= */
.slide {
    height: 100vh;
    width: 100%;
    scroll-snap-align: start;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    background-color: #ffffff;
}

/* Slide image */
.slide img {
    max-width: 100%;
    max-height: 100vh;
    object-fit: contain;
    display: block;
    opacity: 0;
    transition: opacity 0.7s ease-in-out;
    user-select: none;
    -webkit-user-drag: none;
}

.slide img.loaded {
    opacity: 1;
}

/* Page number badge */
.page-number {
    display: none;
}

/* =============================================
   RESPONSIVE — MOBILE (≤ 768 px)
   ============================================= */
@media (max-width: 768px) {

    #top-nav {
        left: auto !important;
        right: 20px;
        top: 30px;
        transform: none !important;
    }

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

    #nav-links {
        flex-direction: column;
        align-items: flex-end;
        gap: 2px;
    }

    #nav-links li {
        font-size: 0.6rem;
        padding: 3px 8px;
    }

    /* Pill moves vertically on mobile */
    #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 cubic-bezier(0.25, 1, 0.5, 1),
                    width  0.4s cubic-bezier(0.25, 1, 0.5, 1),
                    opacity 0.3s ease;
    }

    #title-overlay {
        font-size: 0.7rem;
        left: 20px;
    }

    #info-overlay {
        top: auto;
        bottom: 30px;
        left: 20px;
        right: auto;
        font-size: 0.7rem;
        text-align: left;
    }

    .page-number {
        bottom: 30px;
        right: 20px;
    }
}