body { font-family: 'Segoe UI', sans-serif; background: #f4f7f6; padding: 20px; }
.container { max-width: 1000px; margin: auto; background: white; padding: 30px; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); }
h1 { text-align: center; color: #2c3e50; }

.tabs { display: flex; gap: 10px; margin-bottom: 20px; border-bottom: 2px solid #eee; padding-bottom: 10px; }
.tab-btn { padding: 10px 20px; border: none; background: #eee; border-radius: 4px; }
.tab-btn.active { background: #3498db; color: white; }

.upload-section { text-align: center; margin-bottom: 20px; display: flex; justify-content: center; gap: 10px; }
#fileInput { display: none; }

/* Estilos de la Zona de Arrastre */
.drop-zone {
    border: 2px dashed #3498db;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    color: #7f8c8d;
    transition: background 0.3s, border-color 0.3s;
    min-height: 200px;
}
.drop-zone.dragover {
    background: #ebf5fb;
    border-color: #2980b9;
    color: #2980b9;
}

.custom-file-upload, .primary-btn { padding: 12px 24px; background: #27ae60; color: white; border-radius: 4px; cursor: pointer; border: none; }
.secondary-btn { padding: 12px 24px; background: #e74c3c; color: white; border-radius: 4px; cursor: pointer; border: none; }

table { width: 100%; border-collapse: collapse; margin-top: 20px; color: #2c3e50; }
th, td { padding: 12px; text-align: left; border-bottom: 1px solid #ddd; }
.status-ok { color: #27ae60; font-weight: bold; }
.status-error { color: #e74c3c; font-weight: bold; }
.actions { text-align: center; margin-top: 20px; }