.st-pdf-wrapper {
    width: 100%;
    padding: 10px;
    box-sizing: border-box;
}

.st-pdf-container {
    width: 100%;
    max-width: 900px;
    margin: auto;
}

.st-page {
    width: 100%;
    height: auto;
    margin-bottom: 16px;
    border-radius: 8px;
    box-shadow: 0 6px 16px rgba(0,0,0,0.08);
}

/* Placeholder (before load) */
.st-page-placeholder {
    width: 100%;
    height: 400px;
    margin-bottom: 16px;
    background: linear-gradient(
        90deg,
        #f0f0f0 25%,
        #e0e0e0 37%,
        #f0f0f0 63%
    );
    background-size: 400% 100%;
    animation: shimmer 1.4s ease infinite;
    border-radius: 8px;
}

/* Loading shimmer */
@keyframes shimmer {
    0% { background-position: 100% 0; }
    100% { background-position: -100% 0; }
}

/* Mobile optimization */
@media (max-width: 768px) {

    .st-pdf-wrapper {
        padding: 5px;
    }

    .st-page-placeholder {
        height: 300px;
    }

}