.book-masthead {
    margin: 1rem 0 2rem;
    padding: 1.25rem 1.4rem;
    border: 1px solid var(--theme-popup-border);
    border-radius: 14px;
    background:
        linear-gradient(135deg, rgba(0, 150, 207, 0.18), rgba(0, 150, 207, 0.04)),
        var(--quote-bg);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
}

.book-masthead p {
    margin: 0;
}

.book-masthead__eyebrow {
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-size: 0.78rem;
    color: var(--sidebar-active);
}

.book-masthead__author {
    margin-top: 0.45rem;
    font-size: 1.4rem;
}

.book-masthead__meta {
    margin-top: 0.55rem;
    color: var(--sidebar-fg);
}

.book-masthead__meta a {
    font-weight: 600;
}

@media (max-width: 700px) {
    .book-masthead {
        padding: 1rem 1.05rem;
    }

    .book-masthead__author {
        font-size: 1.2rem;
    }
}