body {
    background: #3a2818 url('../img/bg-wood.jpg') repeat;
    background-size: 256px 256px;
    min-height: 100vh;
    margin: 0;
}

.book-scene {
    perspective: 1500px;
    -webkit-perspective: 1500px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 40px);
    padding: 20px;
}

.book-wrapper {
    position: relative;
    width: 840px;
    height: 594px;
    flex-shrink: 0;
}

.book-back {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    border-radius: 6px;
    box-shadow: inset 0 0 40px rgba(0,0,0,0.08);
    z-index: 0;
}

.book-body {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.pagine-stack {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
}

.pagina {
    position: absolute;
    left: 50%;
    top: 0;
    width: 50%;
    height: 100%;
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
    transform-origin: left center;
    -webkit-transform-origin: left center;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transition: transform 0.8s ease-in-out;
    -webkit-transition: -webkit-transform 0.8s ease-in-out;
    cursor: pointer;
}

.pagina.girata {
    transform: rotateY(-180deg);
    -webkit-transform: rotateY(-180deg);
}

.pagina .fronte,
.pagina .retro {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 40px 35px 40px 40px;
    box-sizing: border-box;
    overflow-y: auto;
    background: #f5e6c8 url('../img/page.jpg') repeat;
    background-size: cover;
    font-family: 'Merriweather', Georgia, 'Times New Roman', serif;
    font-size: 0.95rem;
    line-height: 1.7;
    color: #3a3028;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.pagina .retro {
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
}

.pagina[data-index="1"] .fronte {
    background: #f0e4c8;
}
.pagina[data-index="1"] .fronte .contenuto-pagina:empty {
    min-height: 100%;
}

.contenuto-pagina p {
    margin-bottom: 0.8rem;
}

.author-box {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #d4b896;
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid #d4b896;
    flex-shrink: 0;
}

.contenuto-pagina p:first-of-type::first-letter {
    font-size: 3.2rem;
    font-weight: 700;
    float: left;
    line-height: 0.9;
    margin-right: 0.4rem;
    margin-top: 0.08rem;
    color: #6b3a1a;
    font-family: 'Merriweather', Georgia, serif;
}

.num-pagina {
    position: absolute;
    bottom: 20px;
    right: 30px;
    font-size: 0.8rem;
    color: #8a7a6a;
    font-family: 'Merriweather', Georgia, serif;
    pointer-events: none;
    z-index: 5;
}

.retro-num {
    left: 30px;
    right: auto;
}

.cover {
    position: absolute;
    left: 50%;
    top: 0;
    width: 50%;
    height: 100%;
    cursor: pointer;
    z-index: 100;
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
    transform-origin: left center;
    -webkit-transform-origin: left center;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transition: transform 1s ease-in-out;
    -webkit-transition: -webkit-transform 1s ease-in-out;
    box-shadow: -4px 0 12px rgba(0,0,0,0.3);
    border-radius: 0 6px 6px 0;
}

.cover .cover-fronte {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 0 6px 6px 0;
    overflow: hidden;
}

.cover .cover-retro {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
    border-radius: 0 6px 6px 0;
    background: linear-gradient(135deg, #3a0808 0%, #1a0303 100%);
}

.book-wrapper.cover--aperta .cover {
    pointer-events: none;
    transform: rotateY(-175deg) translateZ(-2px);
    -webkit-transform: rotateY(-175deg) translateZ(-2px);
}

.cover-image {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-color: #4a3520;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.cover-image:not([style*="background-image"]) {
    background: linear-gradient(135deg, #5c1010 0%, #3a0808 50%, #1a0303 100%);
}

.cover-overlay {
    text-align: center;
    color: #fff;
    padding: 2rem;
    text-shadow: 0 2px 8px rgba(0,0,0,0.7);
}

.cover-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.2;
    font-family: 'Merriweather', Georgia, serif;
}

.cover-subtitle {
    font-size: 1rem;
    opacity: 0.85;
    font-style: italic;
    margin-bottom: 0.8rem;
    font-family: 'Merriweather', Georgia, serif;
}

.cover-desc {
    font-size: 0.85rem;
    opacity: 0.75;
    font-family: 'Merriweather', Georgia, serif;
}

.book-meta {
    padding: 0.5rem 0;
}

.book-meta-heading {
    font-family: 'Merriweather', Georgia, serif;
    font-size: 1.2rem;
    font-weight: 700;
    color: #5a3a1a;
    border-bottom: 2px solid #d4b896;
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.book-meta-list {
    margin: 0;
    padding: 0;
}

.book-meta-list dt {
    font-weight: 700;
    color: #5a3a1a;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.75rem;
}

.book-meta-list dd {
    margin: 0.15rem 0 0 0;
    font-size: 0.95rem;
    color: #3a3028;
}

.book-meta-list a {
    color: #8b4513;
    text-decoration: none;
}

.book-meta-list a:hover {
    text-decoration: underline;
}

.book-end-message {
    text-align: center;
    padding: 3rem 0;
}

.book-end-message p {
    font-size: 1.2rem;
    font-style: italic;
    color: #8b4513;
}

@media (prefers-reduced-motion: reduce) {
    .cover,
    .pagina {
        transition: none !important;
    }
    .book-wrapper.cover--aperta .cover {
        transform: none;
    }
    .pagina.girata {
        transform: none;
    }
    .pagine-stack,
    .book-back {
        display: none;
    }
    .cover {
        cursor: default;
        position: relative;
        left: 0;
        width: 100%;
        height: 300px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.3);
        border-radius: 6px;
    }
    .book-wrapper {
        width: 100%;
        height: auto;
    }
}

@media (max-width: 899px) {
    body {
        padding: 10px;
    }
    .book-wrapper {
        width: 100%;
        height: auto;
    }
    .book-back,
    .num-pagina {
        display: none;
    }
    .book-body {
        position: relative;
        left: 0;
        width: 100%;
    }
    .pagine-stack {
        position: relative;
    }
    .pagina {
        position: relative;
        left: 0;
        width: 100%;
        cursor: default;
        transform: none !important;
    }
    .pagina .fronte,
    .pagina .retro {
        padding: 20px;
        position: relative;
    }
    .pagina .retro {
        display: none;
    }
    .cover {
        position: relative;
        left: 0;
        width: 100%;
        height: 300px;
        cursor: default;
        box-shadow: 0 4px 12px rgba(0,0,0,0.3);
        border-radius: 6px;
    }
    .book-wrapper.cover--aperta .cover {
        transform: none;
    }
}