/* ── Overlay ── */
.book-addon-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 9999;
    backdrop-filter: blur(4px);
}

.book-addon-overlay.is-open {
    display: block;
}

/* ── Modal ── */
.book-addon-modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    z-index: 10000;
}

.book-addon-modal.is-open {
    display: block;
}

/* ── Close button ── */
.book-addon-close {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    z-index: 10;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.book-addon-close:hover {
    background: #f0f0f0;
}

/* ── Content ── */
.book-addon-content {
    display: flex;
    gap: 24px;
    padding: 32px 28px;
}

/* ── Cover ── */
.book-addon-cover {
    flex-shrink: 0;
    width: 160px;
}

.book-addon-cover img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ── Details ── */
.book-addon-details {
    flex: 1;
    min-width: 0;
}

.book-addon-title {
    margin: 0 0 8px;
    font-size: 24px;
    font-weight: 700;
    line-height: 1.2;
    color: #111;
}

.book-addon-author {
    font-size: 16px;
    color: #7f1416;
    margin-bottom: 12px;
    font-weight: 500;
}

.book-addon-price {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-bottom: 6px;
}

.book-addon-price-new {
    font-size: 28px;
    font-weight: 800;
    color: #7f1416;
}

.book-addon-price-new.is-free {
    color: #27ae60;
}

.book-addon-price-old {
    font-size: 16px;
    color: #999;
    text-decoration: line-through;
}

.book-addon-avail {
    font-size: 13px;
    color: #666;
    margin-bottom: 16px;
}

/* ── Retailer buttons ── */
.book-addon-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 16px;
}

.book-addon-btn {
    display: block;
    text-align: center;
    padding: 11px 16px;
    border-radius: 8px;
    background: #7f1416;
    color: #fff;
    font-weight: 700;
    font-size: 14px;
    text-decoration: none;
    transition: background 0.2s;
}

.book-addon-btn:hover {
    background: #222;
    color: #fff;
}

/* ── Footer ── */
.book-addon-footer {
    text-align: center;
    padding-top: 12px;
    border-top: 1px solid #eee;
}

.book-addon-link {
    color: #333;
    font-size: 14px;
    text-decoration: underline;
}

.book-addon-link:hover {
    color: #222;
}

/* ── Responsive ── */
@media (max-width: 600px) {
    .book-addon-content {
        flex-direction: column;
        align-items: center;
        padding: 24px 20px;
    }

    .book-addon-cover {
        width: 140px;
    }

    .book-addon-title {
        font-size: 20px;
    }

    .book-addon-buttons {
        grid-template-columns: 1fr;
    }
}

/* ── No scroll when open ── */
body.book-addon-no-scroll {
    overflow: hidden;
}

/* ── Trigger button style (optional override) ── */
.book-addon-trigger:hover {
    background: #222 !important;
}