:root {
    --bg-color: #111111;
    --text-color: #f5f5f5;
    --page-shadow: 0 20px 50px rgba(0,0,0,0.5);
    --page-gap: 2px; /* Small gap to simulate binding, or 0 to merge */
    --accent-color: #e63946; /* Can be adjusted based on actual brand manual */
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    scroll-behavior: smooth;
    /* subtle texture or noise could be added here for a brutalist feel */
    background-image: radial-gradient(#222 1px, transparent 1px);
    background-size: 20px 20px;
}

/* Header */
.site-header {
    text-align: center;
    padding: 100px 20px 50px;
    opacity: 0;
    animation: fade-in-up 1s ease forwards;
}

.site-header h1 {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: -2px;
    text-transform: uppercase;
    margin-bottom: 10px;
    color: var(--text-color);
}

.site-header p {
    font-size: 1.2rem;
    font-weight: 400;
    color: #888;
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* Book Container */
.book-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 80px; /* Space between rows */
}

/* Row Layout */
.page-row {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.double-page {
    gap: var(--page-gap);
    /* subtle 3d effect */
    perspective: 1500px;
}

/* Images */
.page-img {
    height: auto;
    max-height: 85vh; /* Ensure the image fits comfortably in the viewport vertically */
    object-fit: contain;
    box-shadow: var(--page-shadow);
    background-color: #fff; /* In case of transparency or loading */
    transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1), box-shadow 0.4s ease;
}

/* Only desktop styling for the double pages (facing pages) */
@media (min-width: 900px) {
    .left-page {
        transform-origin: right center;
        border-top-right-radius: 0;
        border-bottom-right-radius: 0;
        /* Simulated book curve shadow on right edge */
        box-shadow: inset -5px 0 10px rgba(0,0,0,0.1), var(--page-shadow);
    }

    .right-page {
        transform-origin: left center;
        border-top-left-radius: 0;
        border-bottom-left-radius: 0;
        /* Simulated book curve shadow on left edge */
        box-shadow: inset 5px 0 10px rgba(0,0,0,0.1), var(--page-shadow);
    }
    
    /* Hover effects for a bit of dynamic feel */
    .double-page:hover .left-page {
        transform: rotateY(2deg);
        box-shadow: -10px 20px 40px rgba(0,0,0,0.6);
    }
    .double-page:hover .right-page {
        transform: rotateY(-2deg);
        box-shadow: 10px 20px 40px rgba(0,0,0,0.6);
    }

    .single-page:hover .page-img {
        transform: scale(1.02);
    }
}

/* Responsive - Mobile layout */
@media (max-width: 899px) {
    .double-page {
        flex-direction: column;
        gap: 40px; /* Space between sequential pages on mobile */
    }

    .page-img {
        width: 100%;
        max-width: 500px; /* Keep reasonable size */
        max-height: none; /* Let height be governed by width to avoid aspect ratio issues on small screens */
    }

    .book-container {
        gap: 40px;
    }
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 1s ease-out, transform 1s cubic-bezier(0.25, 1, 0.5, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Footer */
.site-footer {
    text-align: center;
    padding: 60px 20px;
    color: #555;
    font-size: 0.9rem;
}