body, html { margin: 0; padding: 0; height: 100%; overflow: hidden; background-color: #333; }
object { width: 100%; height: 100vh; display: block; border: none; }

.back-link {
    position: fixed;
    top: 14px;
    left: 14px;
    color: #fff;
    background: rgba(0, 0, 0, 0.55);
    text-decoration: none;
    padding: 5px 12px;
    border-radius: 6px;
    font-family: sans-serif;
    font-size: 0.875rem;
    z-index: 10;
    transition: background 0.2s ease;
}

.back-link:hover { background: rgba(0, 0, 0, 0.8); }

.pdf-fallback {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    color: #fff;
    font-family: sans-serif;
    gap: 12px;
}

.pdf-fallback a { color: #00a8ff; }