.wcf-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 16px 0;
    isolation: isolate;
    position: relative;
    z-index: 0;
}

.wcf-book {
    width: 100%;
    max-width: 1200px;
    /* transformの影響範囲をブロック */
    transform: translateZ(0);
    will-change: auto;
}

.wcf-page {
    overflow: hidden;
    background: #fff;
}

.wcf-book canvas,
.wcf-book .stf__parent,
.wcf-book .stf__wrapper {
    z-index: 1;
}

.wcf-page img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    pointer-events: none;
    user-select: none;
}

/* コントロールバー */
.wcf-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}

.wcf-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: 1px solid #ccc;
    border-radius: 50%;
    background: #fff;
    font-size: 18px;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
    -webkit-tap-highlight-color: transparent;
}

.wcf-btn:hover {
    background: #f0f0f0;
    border-color: #999;
}

.wcf-page-num {
    font-size: 14px;
    color: #555;
    min-width: 60px;
    text-align: center;
}

@media (max-width: 767px) {
    .wcf-wrap {
        padding: 12px 0;
        gap: 12px;
    }

    .wcf-btn {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
}