body {
    background: #f5f7fb;
    color: #212529;
}

.card {
    border: 0;
    border-radius: 18px;
    box-shadow: 0 0.5rem 1.25rem rgba(0, 0, 0, 0.06);
}

.btn {
    border-radius: 12px;
}

.form-control,
.form-select,
textarea {
    border-radius: 12px;
}

.titulo-libro {
    font-size: 1.6rem;
    font-weight: 700;
    line-height: 1.2;
}

.portada-admin {
    width: 72px;
    height: 108px;
    object-fit: cover;
    border-radius: 10px;
    background: #e9ecef;
    border: 1px solid #dee2e6;
}

.portada-detalle {
    display: block;
    width: 100%;
    max-width: 260px;
    height: auto;
    aspect-ratio: 2 / 3;
    object-fit: cover;
    border-radius: 16px;
    background: #e9ecef;
    border: 1px solid #dee2e6;
    margin: 0 auto;
}

.badge-estado {
    font-size: 0.85rem;
}

.acciones-admin .btn {
    margin-bottom: 0.35rem;
}

.mapa-libro {
    width: 100%;
    height: 360px;
    border-radius: 16px;
    overflow: hidden;
    background: #e9ecef;
}

.timeline-item {
    position: relative;
    padding-left: 1rem;
    border-left: 3px solid #dee2e6;
    margin-left: 0.35rem;
    padding-bottom: 1.25rem;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-punto {
    position: absolute;
    left: -0.56rem;
    top: 0.2rem;
    width: 0.95rem;
    height: 0.95rem;
    border-radius: 50%;
    background: #0d6efd;
    border: 2px solid #fff;
    box-shadow: 0 0 0 2px rgba(13, 110, 253, 0.15);
}

.timeline-punto.liberado {
    background: #198754;
    box-shadow: 0 0 0 2px rgba(25, 135, 84, 0.15);
}

.accion-card {
    min-height: 100%;
}

.codigo-libro {
    font-family: monospace;
    font-size: 0.95rem;
    background: #f1f3f5;
    padding: 0.2rem 0.5rem;
    border-radius: 8px;
    display: inline-block;
}

@media (max-width: 576px) {
    .tabla-libros th,
    .tabla-libros td {
        white-space: nowrap;
    }

    .mapa-libro {
        height: 300px;
    }

    .portada-detalle {
        max-width: 220px;
    }
}