/* ========== ADMIN COMPARTIDO ========== */
.pthc-metabox { padding: 8px 0; }
.pthc-status { font-weight: bold; padding: 6px 10px; border-radius: 4px; display: inline-block; margin-bottom: 10px; }
.pthc-ok    { background: #d4edda; color: #155724; }
.pthc-error { background: #f8d7da; color: #721c24; }

/* ========== BIBLIOTECA ========== */
.pdfjs-biblioteca {
    display: grid;
    grid-template-columns: repeat(var(--pdfjs-cols, 5), 1fr);
    gap: 20px;
    padding: 20px 0;
}
@media (max-width: 900px) { .pdfjs-biblioteca { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 500px) { .pdfjs-biblioteca { grid-template-columns: repeat(2, 1fr); } }

.pdfjs-libro { display: flex; flex-direction: column; }

.pdfjs-libro-titulo {
    margin: 0 0 8px;
    font-size: .82em;
    font-weight: 600;
    text-align: center;
    line-height: 1.3;
    color: #222;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    min-height: 2.4em;
}

.pdfjs-libro-img-link { display: block; text-decoration: none; }

.pdfjs-libro-cover {
    position: relative;
    width: 100%;
    aspect-ratio: 3/4;
    background: #f0ece6;
    border-radius: 3px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,.18);
}

.pdfjs-libro-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.pdfjs-libro-nocover {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea, #764ba2);
    font-size: 2.5em;
}

.pdfjs-libro-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity .15s ease;
    color: #fff;
    font-weight: bold;
    font-size: .95em;
}
.pdfjs-libro-img-link:hover .pdfjs-libro-overlay { opacity: 1; }

.pdfjs-libro-cover::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 4px;
    background: linear-gradient(to right, rgba(0,0,0,.15), transparent);
    z-index: 1;
}

.pdfjs-libro-leer {
    display: block;
    margin: 8px 0 0;
    font-size: .75em;
    text-align: center;
    color: #0073aa;
    font-weight: 600;
    text-decoration: none;
}
.pdfjs-libro-leer:hover { text-decoration: underline; color: #005a87; }

/* ========== PÁGINA DE AYUDA ========== */
.pthc-ayuda { max-width: 860px; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
.pthc-ayuda h2 { font-size: 1.4em; border-bottom: 2px solid #0073aa; padding-bottom: 6px; color: #0073aa; margin-top: 32px; }
.pthc-ayuda h3 { margin-top: 20px; font-size: 1.05em; }
.pthc-ayuda code { background: #f3f4f6; padding: 2px 6px; border-radius: 3px; font-size: .9em; color: #c0392b; }
.pthc-ayuda pre { background: #1e1e2e; color: #cdd6f4; padding: 14px 18px; border-radius: 6px; overflow-x: auto; font-size: .88em; line-height: 1.6; margin: 8px 0 16px; }
.pthc-badge { display: inline-block; background: #0073aa; color: #fff; font-size: .72em; padding: 2px 8px; border-radius: 10px; vertical-align: middle; margin-left: 6px; }
.pthc-badge.opcional { background: #6c757d; }
.pthc-generador { background: #f8f9fa; border: 1px solid #dee2e6; border-radius: 8px; padding: 20px 24px; margin: 16px 0; }
.pthc-generador label { display: block; font-weight: 600; margin-bottom: 4px; font-size: .9em; color: #333; }
.pthc-generador input, .pthc-generador select { width: 100%; padding: 7px 10px; border: 1px solid #ccc; border-radius: 4px; font-size: .9em; margin-bottom: 14px; box-sizing: border-box; }
.pthc-resultado { background: #1e1e2e; color: #a6e3a1; padding: 12px 16px; border-radius: 6px; font-family: monospace; font-size: .92em; margin-top: 10px; word-break: break-all; cursor: pointer; position: relative; }
.pthc-resultado::after { content: '📋 Copiar'; position: absolute; right: 12px; top: 50%; transform: translateY(-50%); font-size: .75em; background: #313244; padding: 3px 8px; border-radius: 4px; color: #cdd6f4; }
.pthc-resultado.copiado::after { content: '✅ Copiado'; }
.pthc-tabla { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: .88em; }
.pthc-tabla th { background: #0073aa; color: #fff; padding: 8px 12px; text-align: left; }
.pthc-tabla td { padding: 8px 12px; border-bottom: 1px solid #e2e8f0; vertical-align: top; }
.pthc-tabla tr:hover td { background: #f0f7fb; }