/* ==========================================================================
   LIVRO 3D HIPER-REALISTA EM CSS PURO (O DIÁRIO DE HASS)
   Proporção 1:1 Fiel aos Arquivos Originais:
   - Capa Frontal / Verso: 1748 x 2476 px (Formato A5 Oficial 148 x 210 mm)
   - Lombada Física: 166 x 2476 px (Exatamente 9.5% da largura da capa)
   ========================================================================== */

:root {
    /* Dimensões Desktop: 248px largura x 352px altura x 23.5px lombada */
    --book-width: 248px;
    --book-height: 352px;
    --book-depth: 23.5px; /* Exato 166/1748 da largura original da arte */
    --bookmark-height: calc(var(--book-height) * 0.90);
    --bookmark-width: calc(var(--bookmark-height) * (296 / 674));
    --bookmark-slide-x: 58px;
    --bookmark-slide-y: -100px;
    --page-color-light: #f7f1e1; /* Papel Pólen 80g/m² amarelado */
    --page-color-dark: #ede1c2;
    --page-edge-line: #d8cca6;
}

@media (max-width: 768px) {
    :root {
        /* Dimensões Mobile com Proporção Ideal e Respiro Amplo */
        --book-width: 178px;
        --book-height: 252px;
        --book-depth: 17px;
        --bookmark-slide-x: 40px;
        --bookmark-slide-y: -70px;
    }
    .book-3d-scene {
        height: calc(var(--book-height) + 100px) !important;
        margin: 10px auto 14px !important;
    }
    .book-bookmark {
        top: -68px;
    }
}

@media (max-width: 420px) {
    :root {
        --book-width: 162px;
        --book-height: 230px;
        --book-depth: 15.5px;
        --bookmark-slide-x: 36px;
        --bookmark-slide-y: -65px;
    }
    .book-3d-scene {
        height: calc(var(--book-height) + 95px) !important;
        margin: 8px auto 12px !important;
    }
    .book-bookmark {
        top: -62px;
    }
}

/* Container de Perspectiva */
.book-3d-scene {
    position: relative;
    width: 100%;
    max-width: 420px;
    height: calc(var(--book-height) + 100px);
    margin: 0 auto;
    perspective: 1400px;
    perspective-origin: 50% 45%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    user-select: none;
    touch-action: pan-y;
}

/* 1. Camada de Levitação Suave */
.book-3d-floating {
    position: relative;
    width: var(--book-width);
    height: var(--book-height);
    transform-style: preserve-3d;
    animation: book-levitate 5s ease-in-out infinite;
}

@keyframes book-levitate {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* 2. Camada de Rotação (manipulada diretamente por drag ou atalhos) */
.book-3d-rotator {
    position: absolute;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transform: rotateY(-24deg) rotateX(10deg);
    cursor: grab;
    will-change: transform;
}

.book-3d-rotator.is-dragging {
    cursor: grabbing;
}

/* 3. Faces do Livro */
.book-face {
    position: absolute;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transform-style: preserve-3d;
    transition: opacity 0.5s ease;
}

/* CAPA FRONTAL (Laminação Bopp Fosca 300g/m²) */
.book-face--front {
    width: var(--book-width);
    height: var(--book-height);
    top: 0;
    left: 0;
    background-color: #0d0d0d;
    background-image: url('livro-3d/frente.jpg');
    background-size: 100% 100%;
    background-position: center;
    border-radius: 1px 4px 4px 1px;
    transform: translateZ(calc(var(--book-depth) / 2));
    box-shadow: 
        inset 3px 0 8px rgba(0, 0, 0, 0.6),
        inset -1px 0 3px rgba(255, 255, 255, 0.08);
}

.book-face--front::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.06) 0%, rgba(0,0,0,0.2) 100%);
    pointer-events: none;
    border-radius: 1px 4px 4px 1px;
}

/* CONTRA-CAPA (VERSO) */
.book-face--back {
    width: var(--book-width);
    height: var(--book-height);
    top: 0;
    left: 0;
    background-color: #0d0d0d;
    background-image: url('livro-3d/verso.jpg');
    background-size: 100% 100%;
    background-position: center;
    border-radius: 4px 1px 1px 4px;
    transform: rotateY(180deg) translateZ(calc(var(--book-depth) / 2));
    box-shadow: inset -3px 0 8px rgba(0, 0, 0, 0.6);
}

/* LOMBADA REAL (PROPORÇÃO ORIGINAL 1:1) */
.book-face--spine {
    width: var(--book-depth);
    height: var(--book-height);
    top: 0;
    left: 0;
    background-color: #0a0a0a;
    background-image: url('livro-3d/lombada.jpg');
    background-size: 100% 100%;
    background-position: center;
    transform-origin: left center;
    transform: rotateY(-90deg) translateX(calc(-1 * var(--book-depth) / 2)) translateZ(0);
    box-shadow: 
        inset 0 0 8px rgba(0, 0, 0, 0.8),
        inset 0 3px 4px rgba(0,0,0,0.5),
        inset 0 -3px 4px rgba(0,0,0,0.5);
}

/* CORTE LATERAL (PÁGINAS PÓLEN 80g/m² AMARELADAS) */
.book-face--pages-right {
    width: calc(var(--book-depth) - 3px);
    height: calc(var(--book-height) - 6px);
    top: 3px;
    right: 0;
    transform-origin: right center;
    transform: rotateY(90deg) translateX(calc(var(--book-depth) / 2 - 1.5px));
    background: repeating-linear-gradient(
        to bottom,
        var(--page-color-light) 0px,
        var(--page-color-light) 1.5px,
        var(--page-edge-line) 1.5px,
        var(--page-color-dark) 3px
    );
    box-shadow: 
        inset 6px 0 12px rgba(0, 0, 0, 0.35),
        inset -2px 0 5px rgba(0, 0, 0, 0.2);
    border-radius: 1px;
}

/* CORTE SUPERIOR */
.book-face--pages-top {
    width: calc(var(--book-width) - 6px);
    height: calc(var(--book-depth) - 3px);
    top: 0;
    left: 4px;
    transform-origin: top center;
    transform: rotateX(90deg) translateY(calc(-1 * (var(--book-depth) / 2 - 1.5px)));
    background: repeating-linear-gradient(
        to right,
        var(--page-color-light) 0px,
        var(--page-color-light) 1.5px,
        var(--page-edge-line) 1.5px,
        var(--page-color-dark) 3px
    );
    box-shadow: inset 0 5px 10px rgba(0, 0, 0, 0.4);
}

/* CORTE INFERIOR */
.book-face--pages-bottom {
    width: calc(var(--book-width) - 6px);
    height: calc(var(--book-depth) - 3px);
    bottom: 0;
    left: 4px;
    transform-origin: bottom center;
    transform: rotateX(-90deg) translateY(calc(var(--book-depth) / 2 - 1.5px));
    background: repeating-linear-gradient(
        to right,
        var(--page-color-light) 0px,
        var(--page-color-light) 1.5px,
        var(--page-edge-line) 1.5px,
        var(--page-color-dark) 3px
    );
    box-shadow: inset 0 -5px 10px rgba(0, 0, 0, 0.4);
}

/* SOMBRA DE CHÃO REALISTA */
.book-3d-shadow {
    position: absolute;
    width: calc(var(--book-width) * 1.15);
    height: 35px;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) rotateX(80deg);
    background: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.85) 0%, rgba(217, 119, 6, 0.12) 30%, rgba(0, 0, 0, 0) 75%);
    filter: blur(10px);
    pointer-events: none;
}

/* CONTROLES DE ÂNGULO 3D */
.book-3d-controls {
    position: absolute;
    bottom: 0px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(18, 18, 20, 0.88);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(245, 158, 11, 0.35);
    padding: 5px 12px;
    border-radius: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.7);
    z-index: 20;
    white-space: nowrap;
}

.book-btn-angle {
    background: none;
    border: none;
    color: #a1a1aa;
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 4px 8px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.book-btn-angle:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.1);
}

.book-btn-angle.active {
    color: #000000;
    background: var(--accent-amber);
}

.book-btn-angle svg {
    width: 13px;
    height: 13px;
    vertical-align: middle;
    margin-right: 2px;
}

/* ==========================================================================
   MARCADOR DE PÁGINAS BIZARRO (REVELAÇÃO DINÂMICA)
   - Proporção estrita (aspect-ratio 296/674) sem distorção
   - Comprimento proporcional (90% da altura do livro)
   - Em repouso: Inserido dentro do livro, com crânio e olhos vermelhos espiando acima do corte superior
   - Verso do marcador: Branco realista (como no item físico)
   - Modo "Marcador": Livro desaparece suavemente e o marcador centraliza com destaque absoluto
   ========================================================================== */
.book-bookmark {
    position: absolute;
    top: -72px;
    left: calc(var(--book-width) * 0.22);
    width: var(--bookmark-width);
    height: var(--bookmark-height);
    aspect-ratio: 296 / 674;
    transform-style: preserve-3d;
    transform: translateZ(4px);
    transition: 
        top 0.7s cubic-bezier(0.25, 1, 0.35, 1),
        left 0.7s cubic-bezier(0.25, 1, 0.35, 1),
        transform 0.7s cubic-bezier(0.25, 1, 0.35, 1),
        filter 0.7s ease;
    cursor: pointer;
    z-index: 15;
    pointer-events: auto;
}

@media (max-width: 768px) {
    .book-bookmark {
        top: -68px;
    }
}

@media (max-width: 420px) {
    .book-bookmark {
        top: -62px;
    }
}

.book-bookmark-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    user-select: none;
    -webkit-user-drag: none;
    filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.65));
    transition: filter 0.5s ease, opacity 0.5s ease;
}

/* Verso branco do marcador físico quando o livro vira para trás */
.book-bookmark.is-verso .book-bookmark-img {
    filter: brightness(0) invert(1) drop-shadow(0 2px 6px rgba(0, 0, 0, 0.35));
}

/* QUANDO O MARCADOR É ACIONADO: LIVRO SOME E MARCADOR CENTRALIZA */
.book-3d-scene.is-showing-bookmark .book-face {
    opacity: 0 !important;
    pointer-events: none !important;
}

.book-3d-scene.is-showing-bookmark .book-3d-shadow {
    opacity: 0.35;
    transform: translateX(-50%) rotateX(80deg) scale(0.65);
    transition: all 0.6s ease;
}

/* ESTADO REVELADO CENTRALIZADO (DESTAQUE TOTAL) */
.book-bookmark.is-out {
    top: 15px;
    left: 50%;
    transform: translateX(-50%) translateZ(45px) scale(1.10);
    z-index: 30;
}

.book-bookmark.is-out .book-bookmark-img {
    filter: 
        drop-shadow(0 20px 35px rgba(0, 0, 0, 0.95)) 
        drop-shadow(0 0 20px rgba(220, 38, 38, 0.4));
    animation: bookmark-spectral-float 3.5s ease-in-out infinite alternate;
}

@keyframes bookmark-spectral-float {
    0% {
        transform: translateY(0px) rotateZ(0deg);
    }
    100% {
        transform: translateY(-8px) rotateZ(1deg);
    }
}