/* Password Protection Overlay */
body.locked {
    overflow: hidden;
}
body.locked .book-container, 
body.locked .floating-btn-container {
    display: none !important;
}
#auth-overlay {
    position: fixed;
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%;
    background-color: var(--bg-color);
    z-index: 10000;
    display: flex;
    justify-content: center;
    align-items: center;
}
.auth-box {
    background: #fff;
    padding: 3rem 2rem;
    border: 1px solid #eaeaea;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    text-align: center;
    border-radius: 8px;
    max-width: 400px;
    width: 90%;
    font-family: var(--font-sans);
}
.auth-box h2 {
    margin-top: 0;
    border-bottom: none;
    font-family: var(--font-main);
}