/*
    StyleBookViewer.css
    Visor tipo libro (flip book) basado en turn.js.
    Port en CSS plano del componente book-viewer (Angular) del proyecto
    Foros de Consulta de Acciones Afirmativas.
    Se usa junto con Scripts/turn.js y Scripts/BookViewer.js
*/

.book-viewer {
    --viewer-ink: #33241a;
    --viewer-muted: #7b695d;
    --viewer-border: transparent;
    --viewer-surface: transparent;
    --viewer-shadow: transparent;
    --page-ratio: 0.7727272727;
    --spread-ratio: 1.5454545455;

    display: grid;
    gap: 0.8rem;
    box-sizing: border-box;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    margin: 0 auto;
    border: 1px solid var(--viewer-border);
    border-radius: 1.75rem;
    background: var(--viewer-surface);
    box-shadow: 0 1.25rem 3rem var(--viewer-shadow);
    color: var(--viewer-ink);
}

.book-viewer *,
.book-viewer *::before,
.book-viewer *::after {
    box-sizing: border-box;
}

.book-viewer__toolbar,
.book-viewer__footer {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: flex-end;
}

.book-viewer__copy {
    display: grid;
    gap: 0.15rem;
}

.book-viewer__helper,
.book-viewer__description,
.book-viewer__count,
.book-viewer__empty-copy {
    margin: 0;
}

.book-viewer__title,
.book-viewer__empty-title {
    margin: 0;
    font-size: clamp(1.35rem, 2vw, 1.8rem);
    line-height: 1.15;
}

.book-viewer__description,
.book-viewer__helper,
.book-viewer__count,
.book-viewer__empty-copy {
    color: var(--viewer-muted);
    font-size: 0.95rem;
    line-height: 1.5;
}

.book-viewer__stage {
    position: relative;
    display: grid;
    align-items: center;
    --book-viewer-nav-center-y: 50%;
    min-height: 15rem;
    padding: clamp(1rem, 2vw, 1.5rem);
    border-radius: 1.5rem;
    background:
        radial-gradient(circle at top, rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0) 42%),
        linear-gradient(180deg, rgba(239, 230, 219, 0.9) 0%, rgba(224, 210, 193, 0.95) 100%);
    overflow: hidden;
    outline: none;
    touch-action: pan-y;
}

.book-viewer__stage--fullscreen {
    width: 100%;
    height: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    padding: 1rem;
    border-radius: 0;
}

.book-viewer__stage--fullscreen .book-viewer__book-shell {
    width: 100%;
    max-width: none;
}

.book-viewer__loading {
    position: absolute;
    inset: 0;
    z-index: 8;
    display: grid;
    place-content: center;
    justify-items: center;
    gap: 0.6rem;
    background: rgba(248, 243, 237, 0.72);
    backdrop-filter: blur(1px);
}

.book-viewer__loading-copy {
    margin: 0;
    color: var(--viewer-ink);
    font-size: 0.9rem;
    font-weight: 600;
}

.book-viewer__spinner {
    width: 1.3rem;
    height: 1.3rem;
    border: 2px solid rgba(74, 47, 23, 0.2);
    border-top-color: rgba(74, 47, 23, 0.75);
    border-radius: 50%;
    animation: book-viewer-spin 850ms linear infinite;
}

.book-viewer__retry {
    border: 0;
    padding: 0.45rem 0.85rem;
    border-radius: 999px;
    background: #efe4d7;
    color: var(--viewer-ink);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}

.book-viewer__stage:focus-visible {
    box-shadow: 0 0 0 0.22rem rgba(143, 32, 50, 0.18);
}

.book-viewer__book-shell {
    width: min(100%, 70rem);
    max-width: 100%;
    min-width: 0;
    margin: 0 auto;
    display: grid;
    place-items: center;
}

.book-viewer__book-shell-content {
    display: grid;
    place-items: center;
    max-width: 100%;
    min-width: 0;
}

.book-viewer__flipbook {
    position: relative;
    margin: 0 auto;
    perspective: 2600px;
    transform-style: preserve-3d;
    touch-action: pan-y;
}

.book-viewer__flipbook--hidden {
    visibility: hidden;
}

.book-viewer__flipbook .shadow,
.book-viewer__flipbook .turnjs-shadow {
    display: none !important;
    background: none !important;
    box-shadow: none !important;
}

.book-viewer__flipbook .book-viewer__page {
    width: 100%;
    height: 100%;
}

.book-viewer__flipbook .even .book-viewer__page-surface {
    border-radius: 1.2rem 0 0 1.2rem;
    border-right: 0;
}

.book-viewer__flipbook .odd .book-viewer__page-surface {
    border-radius: 0 1.2rem 1.2rem 0;
    border-left: 0;
}

.book-viewer--mobile .book-viewer__flipbook .book-viewer__page-surface {
    border-radius: 1.2rem;
    border: 0;
}

.book-viewer__page {
    position: relative;
    width: 100%;
    height: 100%;
}

.book-viewer__page-surface {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #fff;
    border: 0;
    border-radius: 1.2rem;
    box-shadow: none;
}

.book-viewer__page-surface::after {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.book-viewer__page-image,
.book-viewer__thumbnail-image {
    display: block;
    width: 100%;
    height: 100%;
    user-select: none;
    -webkit-user-select: none;
    pointer-events: none;
    -webkit-user-drag: none;
}

.book-viewer__page-image {
    object-fit: fill;
}

.book-viewer__thumbnail-image {
    object-fit: cover;
}

.book-viewer__thumbnail-image:not([src]) {
    visibility: hidden;
}

.book-viewer__nav,
.book-viewer__action,
.book-viewer__thumbnail,
.book-viewer__fullscreen-toggle {
    border: 0;
    font: inherit;
    cursor: pointer;
}

.book-viewer__nav {
    position: absolute;
    top: var(--book-viewer-nav-center-y, 50%);
    z-index: 5;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    width: 3.1rem;
    height: 3.1rem;
    padding: 0;
    border-radius: 999px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255, 255, 255, 0.92);
    color: var(--viewer-ink);
    box-shadow: 0 0.9rem 1.7rem rgba(39, 23, 12, 0.18);
    transform: translateY(-50%);
    transition:
        transform 180ms ease,
        box-shadow 180ms ease,
        background-color 180ms ease,
        opacity 180ms ease;
}

.book-viewer__nav:hover:not(:disabled) {
    transform: translateY(-50%) scale(1.03);
    box-shadow: 0 1.1rem 2rem rgba(39, 23, 12, 0.24);
}

.book-viewer__nav:disabled,
.book-viewer__action:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    box-shadow: none;
}

.book-viewer__nav--previous {
    --book-viewer-nav-icon-offset-x: 0.05rem;
    left: 0.85rem;
}

.book-viewer__nav--next {
    --book-viewer-nav-icon-offset-x: -0.05rem;
    right: 0.85rem;
}

.book-viewer__nav span {
    position: relative;
    display: block;
    width: 0.78rem;
    height: 0.78rem;
    font-size: 0;
    line-height: 0;
    transform: translateX(var(--book-viewer-nav-icon-offset-x, 0));
}

.book-viewer__nav span::before {
    content: "";
    position: absolute;
    inset: 0;
    box-sizing: border-box;
    width: 0.62rem;
    height: 0.62rem;
    margin: auto;
    border-top: 0.18rem solid currentColor;
    border-right: 0.18rem solid currentColor;
    border-radius: 0.06rem;
}

.book-viewer__nav--previous span::before {
    transform: rotate(-135deg);
}

.book-viewer__nav--next span::before {
    transform: rotate(45deg);
}

.book-viewer__fullscreen-toggle {
    position: absolute;
    top: 0.85rem;
    right: 0.85rem;
    z-index: 7;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.25rem;
    padding: 0.45rem 0.9rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.92);
    color: var(--viewer-ink);
    font-size: 0.88rem;
    font-weight: 700;
    box-shadow: 0 0.6rem 1.2rem rgba(39, 23, 12, 0.16);
    transition:
        transform 180ms ease,
        box-shadow 180ms ease,
        background-color 180ms ease;
}

.book-viewer__fullscreen-toggle:hover {
    transform: translateY(-0.06rem);
    box-shadow: 0 0.9rem 1.5rem rgba(39, 23, 12, 0.2);
}

.book-viewer__stage--fullscreen .book-viewer__fullscreen-toggle {
    top: 1rem;
    right: 1rem;
}

.book-viewer__actions {
    display: flex;
    gap: 0.65rem;
    flex-wrap: wrap;
    align-items: center;
}

.book-viewer__action-separator {
    display: inline-block;
    width: 0.18rem;
    height: 1.6rem;
    border-radius: 999px;
    background: #ededed;
}

.book-viewer__action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1rem;
    border-radius: 999px;
    background: #efe4d7;
    color: var(--viewer-ink);
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
    transition:
        transform 180ms ease,
        box-shadow 180ms ease,
        background-color 180ms ease;
}

.book-viewer__action:hover:not(:disabled) {
    transform: translateY(-0.08rem);
    box-shadow: 0 1rem 1.7rem rgba(39, 23, 12, 0.22);
}

.book-viewer__thumbnails {
    display: flex;
    gap: 0.75rem;
    overflow-x: auto;
    scroll-snap-type: x proximity;
    scroll-padding-inline: clamp(0.9rem, 2vw, 1.25rem);
    padding: 1rem clamp(0.9rem, 2vw, 1.25rem) 0.35rem;
    cursor: grab;
    -webkit-overflow-scrolling: touch;
}

.book-viewer__thumbnails--dragging {
    cursor: grabbing;
    scroll-snap-type: none;
}

.book-viewer__thumbnails--dragging .book-viewer__thumbnail {
    user-select: none;
    -webkit-user-select: none;
}

.book-viewer__thumbnail {
    flex: 0 0 auto;
    display: grid;
    gap: 0.45rem;
    min-width: 4.6rem;
    padding: 0.45rem;
    border-radius: 1rem;
    background: rgba(255, 255, 255, 0.72);
    box-shadow: 0 0.65rem 1.2rem rgba(39, 23, 12, 0.08);
    transition:
        transform 180ms ease,
        box-shadow 180ms ease,
        background-color 180ms ease;
    scroll-snap-align: start;
    cursor: pointer;
}

.book-viewer__thumbnail:hover {
    transform: translateY(-0.18rem);
    box-shadow: 0 0.9rem 1.45rem rgba(39, 23, 12, 0.14);
}

.book-viewer__thumbnail--active {
    background: #ffeaf7;
    box-shadow: 0 0 0 0.14rem rgba(143, 32, 50, 0.18);
}

.book-viewer__thumbnail-frame {
    display: block;
    width: clamp(4rem, 6vw, 5.2rem);
    aspect-ratio: var(--page-ratio);
    overflow: hidden;
    border-radius: 0.75rem;
    background: #fff;
}

.book-viewer__thumbnail-number {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--viewer-ink);
}

.book-viewer__empty {
    display: grid;
    place-items: center;
    gap: 0.4rem;
    min-height: 18rem;
    text-align: center;
}

.book-viewer__thumbnails::-webkit-scrollbar {
    height: 0.55rem;
}

.book-viewer__thumbnails::-webkit-scrollbar-thumb {
    border-radius: 999px;
    background: rgba(51, 36, 26, 0.18);
}

@keyframes book-viewer-spin {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 959px) {
    .book-viewer {
        padding: 1rem;
        border-radius: 1.25rem;
    }

    .book-viewer__toolbar,
    .book-viewer__footer {
        display: grid;
        gap: 0.75rem;
        align-items: stretch;
    }

    .book-viewer__stage {
        padding: 0.85rem;
    }

    .book-viewer__nav {
        width: 2.8rem;
        height: 2.8rem;
    }

    .book-viewer__nav--previous {
        left: 0.45rem;
    }

    .book-viewer__nav--next {
        right: 0.45rem;
    }

    .book-viewer__thumbnail-frame {
        width: 4.3rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .book-viewer *,
    .book-viewer *::before,
    .book-viewer *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}