.pdf-book-reader {
    display: grid;
    gap: 0.9rem;
    min-height: 78vh;
    padding: 1rem;
    border: 1px solid #dbe3ef;
    border-radius: 18px;
    background:
        radial-gradient(circle at center, rgba(0, 87, 184, 0.07), rgba(255, 255, 255, 0) 54%),
        linear-gradient(180deg, #f8fbff 0%, #eef4fd 100%);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9), 0 18px 38px rgba(15, 23, 42, 0.08);
    overflow: hidden;
}

.pdf-book-reader.is-turnjs {
    overflow: visible;
    background: #f3f5f8;
    border-color: #d7dee8;
}

.pdf-book-reader__toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.pdf-book-reader__status {
    min-height: 1.5rem;
    font-size: 0.92rem;
    color: #475569;
}

.pdf-book-reader__status:empty {
    display: none;
}

.pdf-book-reader__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.pdf-book-reader__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #dbe3ef;
    border-radius: 999px;
    padding: 0.48rem 0.9rem;
    font-weight: 600;
    font-size: 0.85rem;
    background: #fff;
    color: #0f172a;
    cursor: pointer;
    text-decoration: none;
}

.pdf-book-reader__btn[disabled] {
    opacity: 0.45;
    cursor: not-allowed;
}

.pdf-book-reader__btn--primary {
    background: #0057b8;
    border-color: #0057b8;
    color: #fff;
}

.pdf-book-reader__shell {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 0.75rem;
    align-items: stretch;
    padding: 0.6rem;
    border-radius: 20px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(240, 246, 255, 0.9));
    perspective: 2200px;
    transform-style: preserve-3d;
}

.pdf-book-reader__turnbook-wrap {
    display: none;
    position: relative;
    width: 100%;
    height: var(--pdf-book-reader-height, 62vh);
    min-height: 320px;
    align-items: center;
    justify-content: center;
    overflow: visible;
    isolation: isolate;
    border-radius: 10px;
}

.pdf-book-reader__turnbook-wrap,
.pdf-book-reader__page,
.pdf-book-reader__flip-layer {
    transition: opacity 180ms ease;
}

.pdf-book-reader.is-loading .pdf-book-reader__turnbook-wrap,
.pdf-book-reader.is-loading .pdf-book-reader__page,
.pdf-book-reader.is-loading .pdf-book-reader__flip-layer {
    opacity: 0;
    pointer-events: none;
}

.pdf-book-reader__turnbook {
    margin: 0 auto;
    position: relative;
    z-index: 2;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.2);
}

.pdf-book-reader__turn-page {
    background: linear-gradient(90deg, #f8f8f8 0%, #ffffff 8%, #ffffff 92%, #f4f4f4 100%);
    overflow: hidden;
    border: 1px solid #e2e8f0;
    box-shadow: inset 0 0 2px rgba(15, 23, 42, 0.08);
}

.pdf-book-reader__turn-page[data-rendered='0'] {
    background: transparent;
    border-color: transparent;
    box-shadow: none;
}

.pdf-book-reader__turn-page[data-rendered='0'] .pdf-book-reader__turn-page-canvas {
    opacity: 0;
}

.pdf-book-reader__turn-page[data-rendered='1'] .pdf-book-reader__turn-page-canvas {
    opacity: 1;
}

.pdf-book-reader__turn-page-canvas {
    width: 100%;
    height: 100%;
    display: block;
    background: #fff;
}

.pdf-book-reader.is-turnjs .pdf-book-reader__turnbook-wrap {
    display: flex;
    position: relative;
}

/* Click‑zone overlays (left 20 % → prev, right 20 % → next) */
.pdf-book-reader.is-turnjs .pdf-book-reader__turnbook-wrap::before,
.pdf-book-reader.is-turnjs .pdf-book-reader__turnbook-wrap::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 20%;
    z-index: 10;
    pointer-events: none;
    transition: background 200ms ease;
    border-radius: 6px;
}
.pdf-book-reader.is-turnjs .pdf-book-reader__turnbook-wrap::before {
    left: 0;
    background: linear-gradient(90deg, rgba(0,87,184,0.035) 0%, transparent 100%);
}
.pdf-book-reader.is-turnjs .pdf-book-reader__turnbook-wrap::after {
    right: 0;
    background: linear-gradient(90deg, transparent 0%, rgba(0,87,184,0.035) 100%);
}
.pdf-book-reader.is-turnjs .pdf-book-reader__turnbook-wrap:hover::before {
    background: linear-gradient(90deg, rgba(0,87,184,0.09) 0%, transparent 100%);
}
.pdf-book-reader.is-turnjs .pdf-book-reader__turnbook-wrap:hover::after {
    background: linear-gradient(90deg, transparent 0%, rgba(0,87,184,0.09) 100%);
}

.pdf-book-reader.is-turnjs .pdf-book-reader__shell {
    display: flex;
    align-items: center;
    justify-content: center;
    grid-template-columns: 1fr;
    padding: 0.4rem;
    overflow: visible;
    background: transparent;
}

.pdf-book-reader.is-turnjs .pdf-book-reader__page,
.pdf-book-reader.is-turnjs .pdf-book-reader__flip-layer,
.pdf-book-reader.is-turnjs .pdf-book-reader__shell::before,
.pdf-book-reader.is-turnjs .pdf-book-reader__shell::after {
    display: none;
}

.pdf-book-reader__shell::before {
    content: '';
    position: absolute;
    top: 1rem;
    bottom: 1rem;
    left: 50%;
    width: 34px;
    transform: translateX(-50%);
    border-radius: 999px;
    background: linear-gradient(90deg, rgba(15, 23, 42, 0.1), rgba(255, 255, 255, 0.92) 46%, rgba(255, 255, 255, 0.92) 54%, rgba(15, 23, 42, 0.1));
    pointer-events: none;
}

.pdf-book-reader__shell::after {
    content: '';
    position: absolute;
    inset: auto 2rem 0.2rem 2rem;
    height: 18px;
    border-radius: 999px;
    background: radial-gradient(circle at center, rgba(15, 23, 42, 0.18), rgba(15, 23, 42, 0) 72%);
    filter: blur(10px);
    pointer-events: none;
}

.pdf-book-reader__page {
    position: relative;
    min-height: 62vh;
    padding: 0.9rem;
    border-radius: 10px 18px 18px 10px;
    background: linear-gradient(180deg, #ffffff 0%, #fbfcfe 100%);
    box-shadow: 0 18px 30px rgba(15, 23, 42, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.85);
    border: 1px solid #e7edf7;
    overflow: hidden;
    transform-style: preserve-3d;
    backface-visibility: hidden;
    transition: box-shadow 220ms ease, transform 220ms ease;
}

.pdf-book-reader__page::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(15, 23, 42, 0.06), rgba(255, 255, 255, 0) 14%, rgba(255, 255, 255, 0) 86%, rgba(15, 23, 42, 0.05));
    pointer-events: none;
}

.pdf-book-reader__page::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        repeating-linear-gradient(180deg, rgba(15, 23, 42, 0.012) 0 1px, rgba(255, 255, 255, 0) 1px 18px),
        linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0));
    opacity: 0.7;
    pointer-events: none;
}

.pdf-book-reader__page--left {
    border-radius: 18px 10px 10px 18px;
    transform-origin: right center;
}

.pdf-book-reader__page--left::before {
    background: linear-gradient(90deg, rgba(15, 23, 42, 0.05), rgba(255, 255, 255, 0) 12%, rgba(255, 255, 255, 0) 88%, rgba(15, 23, 42, 0.09));
}

.pdf-book-reader__page--right {
    transform-origin: left center;
}

.pdf-book-reader__page--right::before {
    background: linear-gradient(90deg, rgba(15, 23, 42, 0.09), rgba(255, 255, 255, 0) 12%, rgba(255, 255, 255, 0) 88%, rgba(15, 23, 42, 0.05));
}

.pdf-book-reader__canvas {
    position: relative;
    z-index: 0;
    width: 100%;
    height: auto;
    display: block;
    margin-top: 0;
    border-radius: 6px;
    background: #fff;
}

.pdf-book-reader__footer {
    display: flex;
    justify-content: center;
}

.pdf-book-reader__counter {
    margin: 0;
    padding: 0.45rem 0.9rem;
    border-radius: 999px;
    background: #eaf2ff;
    color: #0057b8;
    font-weight: 700;
    font-size: 0.85rem;
}

.pdf-book-reader__flip-layer {
    position: absolute;
    inset: 0.6rem;
    pointer-events: none;
    z-index: 8;
    opacity: 0;
}

.pdf-book-reader__flip-canvas {
    position: absolute;
    top: 0;
    right: 0;
    width: calc(50% - 0.375rem);
    height: 100%;
    border-radius: 10px 18px 18px 10px;
    background: #fff;
    box-shadow: 0 18px 30px rgba(15, 23, 42, 0.16);
    transform-origin: top right;
    backface-visibility: hidden;
}

.pdf-book-reader__flip-shadow {
    position: absolute;
    top: 0;
    right: calc(50% - 0.375rem);
    width: 45%;
    height: 100%;
    opacity: 0;
    filter: blur(8px);
    background: linear-gradient(90deg, rgba(15, 23, 42, 0.2), rgba(15, 23, 42, 0));
    transform-origin: top right;
}

.pdf-book-reader.is-single-page .pdf-book-reader__shell {
    grid-template-columns: 1fr;
    max-width: 840px;
    margin-inline: auto;
    padding: 0.5rem;
}

.pdf-book-reader.is-single-page .pdf-book-reader__page--left {
    display: none;
}

.pdf-book-reader.is-single-page .pdf-book-reader__shell::before {
    display: none;
}

.pdf-book-reader.is-single-page .pdf-book-reader__page--right {
    border-radius: 16px;
    transform-origin: center center;
}

.pdf-book-reader.is-single-page .pdf-book-reader__flip-canvas {
    width: 100%;
    right: 0;
    border-radius: 16px;
}

.pdf-book-reader.is-single-page .pdf-book-reader__flip-shadow {
    right: 0;
    width: 80%;
}

.pdf-book-reader.is-turning {
    pointer-events: none;
}

.pdf-book-reader.is-turning .pdf-book-reader__page {
    will-change: transform, box-shadow, filter;
}

.pdf-book-reader.is-turning .pdf-book-reader__flip-layer {
    opacity: 1;
}

.pdf-book-reader.is-turning.turn-next .pdf-book-reader__flip-canvas {
    animation: pdf-book-corner-next 700ms cubic-bezier(0.26, 0.72, 0.1, 1) both;
}

.pdf-book-reader.is-turning.turn-prev .pdf-book-reader__flip-canvas {
    animation: pdf-book-corner-prev 700ms cubic-bezier(0.26, 0.72, 0.1, 1) both;
}

.pdf-book-reader.is-turning.turn-next .pdf-book-reader__flip-shadow {
    animation: pdf-book-corner-shadow-next 700ms ease both;
}

.pdf-book-reader.is-turning.turn-prev .pdf-book-reader__flip-shadow {
    animation: pdf-book-corner-shadow-prev 700ms ease both;
}

.pdf-book-reader.is-turning.turn-next:not(.is-single-page) .pdf-book-reader__page--right {
    animation: none;
    z-index: 3;
}

.pdf-book-reader.is-turning.turn-prev:not(.is-single-page) .pdf-book-reader__page--left {
    animation: none;
    z-index: 3;
}

.pdf-book-reader.is-turning.turn-next.is-single-page .pdf-book-reader__page--right {
    animation: none;
}

.pdf-book-reader.is-turning.turn-prev.is-single-page .pdf-book-reader__page--right {
    animation: none;
}

@keyframes pdf-book-corner-next {
    0% {
        transform: perspective(2200px) rotateY(0deg) rotateZ(0deg) translateX(0);
        clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
    }
    38% {
        transform: perspective(2200px) rotateY(-48deg) rotateZ(-9deg) translateX(-6%);
        clip-path: polygon(0 0, 100% 0, 84% 100%, 0 100%);
    }
    100% {
        transform: perspective(2200px) rotateY(-170deg) rotateZ(-14deg) translateX(-55%);
        clip-path: polygon(0 0, 100% 0, 55% 100%, 0 100%);
    }
}

@keyframes pdf-book-corner-prev {
    0% {
        transform: perspective(2200px) rotateY(0deg) rotateZ(0deg) translateX(0);
        clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
    }
    38% {
        transform: perspective(2200px) rotateY(48deg) rotateZ(9deg) translateX(6%);
        clip-path: polygon(16% 0, 100% 0, 100% 100%, 0 100%);
    }
    100% {
        transform: perspective(2200px) rotateY(170deg) rotateZ(14deg) translateX(55%);
        clip-path: polygon(45% 0, 100% 0, 100% 100%, 0 100%);
    }
}

@keyframes pdf-book-corner-shadow-next {
    0% {
        opacity: 0.02;
        transform: scaleX(0.9);
    }
    35% {
        opacity: 0.32;
        transform: scaleX(1.08);
    }
    100% {
        opacity: 0;
        transform: scaleX(1.22);
    }
}

@keyframes pdf-book-corner-shadow-prev {
    0% {
        opacity: 0.02;
        transform: scaleX(0.9);
    }
    35% {
        opacity: 0.32;
        transform: scaleX(1.08);
    }
    100% {
        opacity: 0;
        transform: scaleX(1.22);
    }
}

@media (orientation: portrait), (max-width: 760px) {
    .pdf-book-reader {
        min-height: 66vh;
        padding: 0.75rem;
    }

    .pdf-book-reader__shell {
        grid-template-columns: 1fr;
        max-width: 840px;
        margin-inline: auto;
        padding: 0.5rem;
    }

    .pdf-book-reader__page--left {
        display: none;
    }

    .pdf-book-reader__shell::before {
        display: none;
    }

    .pdf-book-reader__page {
        min-height: auto;
        border-radius: 16px;
    }

    .pdf-book-reader__turnbook-wrap {
        min-height: 58vh;
    }
}