.pdf-book-wrapper {
    width: var(--book-width);
    margin: 0 auto;
    color: #fff;
}

.pdf-book-toolbar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.pdf-book-btn {
    border: 0;
    background: #2f2f2f;
    color: #fff;
    padding: .65rem 1rem;
    border-radius: 8px;
    cursor: pointer;
}

.pdf-book-stage {
    position: relative;
    width: 100%;
    height: var(--book-height);
    perspective: 2400px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.pdf-book-shadow {
    position: absolute;
    width: min(1100px, 96%);
    height: 92%;
    border-radius: 20px;
    background: radial-gradient(circle at center, rgba(0,0,0,.25), rgba(0,0,0,.05) 55%, transparent 75%);
    filter: blur(16px);
    transform: translateY(20px);
}

.pdf-book {
    position: relative;
    width: min(1100px, 96%);
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

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

.pdf-book-page {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 46%;
    height: 90%;
    transform-style: preserve-3d;
    transform-origin: left center;
    transition: transform .9s cubic-bezier(.22,.61,.36,1), z-index .01s linear;
    will-change: transform;
}

.pdf-book-page.is-front {
    transform: translateY(-50%) translateX(0) rotateY(0deg);
}

.pdf-book-page.is-flipped {
    transform: translateY(-50%) translateX(0) rotateY(-180deg);
}

.pdf-book-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    overflow: hidden;
    border-radius: 6px;
    box-shadow: 0 10px 25px rgba(0,0,0,.25);
    background: #fff;
}

.pdf-book-face--front {
    transform: rotateY(0deg);
}

.pdf-book-face--back {
    transform: rotateY(180deg);
}

.pdf-book-face canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #fff;
}

.pdf-book-page--cover {
    /* background: linear-gradient(135deg, #6d4c41, var(--book-bg));*/
    background: #00FFD4;
    border-radius: 10px;
    box-shadow: 0 16px 36px rgba(0,0,0,.35);
    width: 46%;
    height: 90%;
    left: 27%;
    top: 5%;
    position: absolute;
}

.pdf-book-cover-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.pdf-book-cover-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    line-height: 1.2;
}

@media (max-width: 900px) {
    .pdf-book-page,
    .pdf-book-page--cover {
        width: 86%;
        left: 7%;
        height: 88%;
    }
}