/* Contenedor y cabecera de la herramienta */
.herramienta-container {
    max-width: 800px;
    margin: 50px auto;
    padding: 0 20px;
}

.herramienta-header {
    text-align: center;
    margin-bottom: 40px;
}

.herramienta-header h1 {
    font-size: 2.2rem;
    margin-bottom: 12px;
    font-weight: 800;
}

.herramienta-header p {
    color: #94a3b8;
    font-size: 1rem;
    max-width: 550px;
    margin: 0 auto;
}

.panel-herramienta {
    background: #1e293b;
    border: 1px solid #334155;
    padding: 30px;
    border-radius: 14px;
}

/* Zona Drop/Arrastre */
.drop-zone {
    border: 2px dashed #475569;
    border-radius: 10px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    background: rgba(30, 41, 59, 0.5);
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.drop-zone i {
    font-size: 3rem;
    color: #f59e0b; /* Ámbar para Dividir */
    display: block;
    margin-bottom: 15px;
}

.drop-zone .texto-principal {
    color: #e2e8f0;
    font-size: 1.1rem;
    font-weight: 600;
    display: block;
    margin-bottom: 5px;
}

.drop-zone .texto-secundario {
    color: #64748b;
    font-size: 0.85rem;
}

/* Opciones de división */
.opciones-division {
    margin-top: 25px;
    display: none;
    border-top: 1px solid #334155;
    padding-top: 20px;
}

.info-archivo-cargado {
    background: #111827;
    border: 1px solid #334155;
    padding: 12px 15px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: #cbd5e1;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.info-archivo-cargado i {
    color: #f59e0b;
    font-size: 1.1rem;
}

.config-rango {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 15px;
}

.config-rango label {
    color: #94a3b8;
    font-size: 0.9rem;
    font-weight: 600;
}

.config-rango input {
    background: #111827;
    border: 1px solid #334155;
    color: #fff;
    padding: 12px;
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s ease;
}

.config-rango input:focus {
    border-color: #f59e0b;
}

/* Botón de Procesamiento */
.btn-procesar-pdf {
    width: 100%;
    margin-top: 15px;
    background: #f59e0b;
    color: white;
    border: none;
    padding: 14px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: not-allowed;
    opacity: 0.5;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: background 0.2s ease, opacity 0.2s ease;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.spin {
    display: inline-block;
    animation: spin 1s linear infinite;
}